WO2013076974A1

WO2013076974A1 - Drive device

Info

Publication number: WO2013076974A1
Application number: PCT/JP2012/007465
Authority: WO
Inventors: 中田　秀輝; 佐野　晃正; 藤畝　健司; 山元　猛晴; 愛甲　秀樹
Original assignee: パナソニック株式会社
Priority date: 2011-11-24
Filing date: 2012-11-21
Publication date: 2013-05-30

Abstract

The present application discloses a drive device provided with: a wall part that defines a housing space in which at least one medium having a processing surface on which information processing is performed is housed; at least one processing element that performs the information processing on the processing surface in a noncontact manner; and a drive mechanism that rotates said at least one medium. The drive mechanism comprises: a force generation part that generates drive force for rotating said at least one medium; a transmission part that transmits the drive force to said at least one medium; and a securing part that secures the force generation part to the wall part. In the wall part, an opening that allows the insertion of the transmission part therethrough is formed. The securing part closes the opening in cooperation with the force generation part.

Description

Drive device

The present invention relates to a drive device for driving a recording medium that receives information processing such as information recording and reproduction.

With the development of the information society in recent years, the amount of data communication on the Internet has increased greatly. As a result, precise audio data and refined video data are communicated via the Internet. An increase in the amount of data communication results in an increase in the amount of electronic data stored in a recording device such as a server. As a result, there is a strong need to increase the capacity of the information recording apparatus. As the information recording device, an HDD (Hard Disk Drive Device: Hard Disk Drive) mounted on various devices such as a personal computer, a recorder, and a camera is exemplified. As another information recording apparatus, an optical disk drive apparatus is exemplified. If the recording density of these information recording devices can be increased, an enormous amount of information will be stored in these devices. A high recording density means miniaturization of the recording bit size of an information recording medium (for example, a hard disk or an optical disk).

In order to record information on an information recording medium such as a hard disk or an optical disk at high density and / or reproduce information recorded at high density from the information recording medium, an information recording medium and a head (recording head or reproduction) The distance between the head and the head needs to be designed to be small. For example, the distance between the information recording medium and the head may be designed to be several nm to several tens of nm. If dust of several tens of nm to several μm enters between the information recording medium and the head, the information recording medium and / or the head may be damaged. As a result, the recording of information on the information recording medium and / or the reproduction of information from the information recording medium may not be performed properly.

As described above, in order to increase the density of the hard disk, the distance between the hard disk and the head is designed to be short. As a result, the crystal grain size of the magnetic film of the hard disk is reduced. Hard disks having miniaturized crystals face the problem of thermal fluctuation (thermally unstable crystal particles). The problem of thermal fluctuation has become apparent as a major impediment to high density hard disks.

The large coercive force contributes to the miniaturization of the crystal grains of the hard disk crystal film and the generation of thermally stable crystal grains. A large coercive force requires a large magnetic field strength used for recording using a magnetic head. However, it is difficult to increase the coercive force as the density increases from the viewpoint of the physical properties of the magnetic material used in the magnetic head and the distance between the hard disk (magnetic disk) and the head.

As a method for solving the above-mentioned problems, “optical / magnetic hybrid recording technology” in which a technology related to optical recording and a technology related to magnetic recording are combined has been proposed. A magnetic field is applied to the magnetic disk for recording information. At the same time, the magnetic disk is heated. As a result, the coercive force of the magnetic disk decreases. Therefore, with a conventional magnetic head, a magnetic disk having a high coercive force can be appropriately subjected to a recording process by an optical / magnetic hybrid recording technique as the magnetic field strength is too small to record information. . For reproducing information, the magnetoresistive effect used in the conventional magnetic recording technology is used. The optical / magnetic hybrid recording technique is called “thermally assisted magnetic recording”.

It has been proposed to use near-field light to heat the magnetic disk. If the near-field light is used in the heat-assisted magnetic recording technology, the laser light generated by the laser light source is guided to the recording head. The recording head incorporates an element having a function of generating near-field light (hereinafter referred to as “generating element”). The light spot diameter is adjusted to a size and shape suitable for recording by the generating element.

Generally, a laser light source is used in a package of a hard disk drive device. Therefore, a small and low power consumption semiconductor laser (also referred to as “laser diode”) is used as the laser light source. If a laser light source is used in an apparatus for performing thermally assisted magnetic recording using near-field light having a recording density of “Tb / in ² (terabyte / square inch)” or more, sufficient heating is performed on the surface of the recording medium. Therefore, the laser light source is required to have a power of several mW.

The laser light generated by the laser diode is guided to the generating element by optical components such as a reflection mirror, a lens and an optical waveguide. The laser light generated by the laser diode passes through various optical components arranged along the optical path, and reaches the generating element and the recording medium. The intensity of the laser light is attenuated while the laser light is propagating along the optical path, and becomes a magnitude of one tenth of the light output generated by the laser diode. Examples of the attenuation of the intensity of laser light include absorption loss and scattering loss caused when the laser light passes through an optical component, and coupling loss due to a shift between the bonding position of the optical component and the ideal position of the optical component. Is done. For thermally-assisted magnetic recording technology, it is important to create a structure that achieves a small coupling loss in the optical path to the generating element.

A pico slider is conventionally used as a slider of a hard disk drive device. As a slider of a hard disk drive device, a femto slider that is smaller than a pico slider may be used. As a result of the downsizing of the slider of the hard disk drive device, the flying height of the recording head is reduced to about 10 nm. As a result of progress in slider miniaturization technology, further reduction in flying height is expected.

In the technical field of optical disk drive devices, high-density optical disks that perform at least one of recording and reproduction using near-field light have been proposed. For example, an optical disk drive device includes a solid immersion lens (SIL) as a near-field optical system for performing information processing such as recording and reproduction on an optical disk. The SIL functions as an objective lens. The optical drive device further includes a control unit that precisely controls the distance between the SIL and the surface of the optical disk. The control unit adjusts the position of the SIL so that the distance between the SIL and the surface of the optical disc is about ½ to about 1/10 of the wavelength of light used. The near-field optical system described above generates near-field light between the SIL and the optical disc, and enables high-density recording processing and / or reproduction processing (numerical aperture (NA) ≧ 1).

If the optical disk drive device uses near-field light, the distance between the optical disk and the end surface of the SIL installed on the condensing element (for example, the objective lens) is precisely controlled so that near-field light can be obtained. It is necessary to If short-wavelength laser light is used, the distance (gap) between the optical disk and the end face of the SIL needs to be controlled to about several tens of nm.

If the optical disk drive device uses near-field light, dust adhering to the end face of the optical disk or SIL becomes a large barrier to the above-described gap control.

Examples of dust adhering to the end surface of the SIL include dust floating in the air and clothing fibers. Since dust often has a width (height) larger than the target value for gap control, dust attached to the end face of the SIL makes gap control impossible.

It is possible to reduce dust to some extent when manufacturing heads, optical disks and optical disk drive devices that perform recording and reproduction. However, it is difficult to completely remove dust. Even if the dust is removed in the manufacturing process, the dust may adhere to the SIL when the optical disc or the optical disc drive device is used. Therefore, it is very difficult to completely eliminate dust.

Plasmon type hard disk drive and optical disk drive have been proposed. Similar to the heat-assisted magnetic recording technology described above as the next generation technology of the hard disk drive device, the plasmon type hard disk drive device and optical disk drive device perform high-density recording using light of a minute spot size.

Plasmon type hard disk drive and optical disk drive perform high density recording using very small spot size light. In order to create a small light spot size, a technique that utilizes a surface plasmon resonance phenomenon that occurs when a conductor is irradiated with propagating light has been proposed. When the surface plasmon resonance phenomenon occurs, minute light (for example, near-field light) is generated at the end of the conductor. If the surface plasmon resonance phenomenon is used for generation of near-field light, minute light having a minute spot size that cannot be achieved by a conventional optical system is irradiated onto the optical disk.

In order to generate a surface plasmon resonance phenomenon in the conductor and generate near-field light, the conductor is designed to have a size of several tens to several hundreds of nm. The higher the target value for the recording density, the smaller the dimension of the end of the conductor that generates near-field light. Further, the distance between the conductor and the optical disc needs to be set very narrow.

In order to condense light emitted from a light source (for example, a laser diode) onto a conductor having a very minute end size, an optical system having good light condensing properties and high propagation efficiency is required. The

As described above, if the disk recording / reproducing apparatus performs processing such as information recording / reproducing under a narrow gap between the recording medium and the head (recording head and / or reproducing head), it adheres to the recording medium / head. It is important to remove dust.

Patent Document 1 discloses a disk cleaning mechanism for removing dust on a recording medium. The disk cleaning mechanism directly wipes off dust on the recording medium using a cleaning tape.

Although the technology disclosed in Patent Document 1 removes dust on the recording medium, it cannot remove dust attached to the end surface of the SIL. Therefore, if dust adheres to the end surface of the SIL, appropriate gap control cannot be achieved.

Patent Document 2 discloses a lens cleaning mechanism that removes dust adhering to the end face of the SIL. The lens cleaning mechanism brings the cleaning tape into contact with the SIL and removes dust adhering to the end surface of the SIL.

If the dust adhered to the surface of the recording medium and the end surface of the SIL is removed using the cleaning mechanism disclosed in Patent Document 1 and Patent Document 2, appropriate gap control is achieved.

Patent Document 3 discloses a dust removal technique using a collection filter. The collection filter is disposed in the airflow generated with the rotation of the recording medium. As a result, the dust inside the hard disk drive device is efficiently captured by the collection filter. Since the airflow containing dust passes through the collection filter, the air inside the hard disk drive device is purified over time.

FIG. 44 is a schematic view of a conventional optical disc drive apparatus 900. With reference to FIG. 44, a conventional optical disc drive apparatus 900 will be described.

The optical disc drive apparatus 900 includes an optical head 910, a servo control system 920, and a spindle motor 930. The optical head 910 and the spindle motor 930 operate under the control of the servo control system 920. The spindle motor 930 rotates an optical disk 950 used as a recording medium.

The optical head 910 includes a laser diode 911 used as a light source (the notation “LD” in FIG. 44 means a laser diode), two

collimating lenses

912 and 913, and a laser emitted from the collimating lens 912. An anamorphic prism 914 for shaping light, a beam splitter 915 (in FIG. 44, “BS” means a beam splitter), and a quarter-wave plate 916 (in FIG. 44, “QWP”). Means a quarter-wave plate), a correction lens 917 for correcting chromatic aberration, an expansion lens 918 for expanding laser light, a Wollaston prism 919, and two

condenser lenses

941 and 942 And a light condensing element 943 and two photo detectors 944 and 945 (in FIG. 44, the notation “PD” And means for) a, in automatic power controller 946 (FIG. 44, denoted with "APC" includes a means auto power controller), and LD driver 947, a.

Wollaston prism 919 consists of two prisms. The light incident on the Wollaston prism 919 is emitted as two linearly polarized lights that are orthogonal to each other. Various signals such as an RF reproduction signal for reproducing a signal recorded on the optical disk 950, a tracking error signal necessary for servo control, and a gap error signal are output from the photodetector 944 to the servo control system 920.

The servo control system 920 includes a gap servo module 921 (focusing servo module), a tracking servo module 922, a tilt servo module 923, and a spindle servo module 924. The tracking servo module 922 performs tracking control on the light condensing element 943 according to the tracking error signal. The tilt servo module 923 controls the tilt angle of the light condensing element 943. The spindle servo module 924 controls the rotation of the spindle motor 930. The gap servo module 921 will be described later.

The auto power controller 946 outputs a predetermined signal to the LD driver 947 in accordance with the signal output from the photo detector 945. The LD driver 947 makes the power of the laser emitted from the laser diode 911 constant according to the signal from the auto power controller 946.

44, the operation of the above-described optical system of the optical disc drive apparatus 900 will be described.

44, an optical disk 950 used as a recording medium is set in the optical disk drive device 900. Thereafter, the servo control system 920 performs various servo controls using the gap servo module 921, the tracking servo module 922, the tilt servo module 923, and the spindle servo module 924.

The laser diode 911 emits laser light toward the collimating lens 912. The collimating lens 912 makes the laser light parallel light. Thereafter, the anamorphic prism 914 shapes the parallel light.

The shaped laser light is incident on the beam splitter 915. The beam splitter 915 divides the incident laser light into light incident on the quarter wavelength plate 916 and light incident on the condenser lens 942. The laser light incident on the condenser lens 942 is used by the auto power controller 946 as described above. As a result of the auto power controller 946 outputting a signal to the LD driver 947 according to the received laser light, the laser diode 911 can emit laser light having a certain power.

The quarter wavelength plate 916 changes the incident laser light from linearly polarized light to circularly polarized light. Thereafter, the correction lens 917 corrects chromatic aberration. The laser light passes through the expansion lens 918 and the collimating lens 913 after the correction lens 917 and is incident on the condensing element 943.

The condensing element 943 condenses the incident laser light toward the optical disk 950 to generate near-field light. As a result, a signal is recorded on the optical disk 950. The generation of near-field light by the light condensing element 943 will be described later.

The near-field light created by the light condensing operation toward the optical disk 950 may be used for reading a signal recorded on the optical disk 950. Alternatively, near-field light may be used to read a signal recorded on the optical disc 950.

Near-field light enters the optical disk 950. The optical disk 950 reflects or diffracts near-field light to produce reflected light or diffracted light (hereinafter referred to as “return light”). The condensing element 943 receives the return light. The return light passes through the condensing element 943, passes through the collimating lens 913, the expansion lens 918, the correction lens 917, and the quarter-wave plate 916 and enters the beam splitter 915. The beam splitter 915 totally reflects the return light toward the Wollaston prism 919. Thereafter, the return light passes through the Wollaston prism 919 and the condenser lens 941 and enters the photodetector 944. The photodetector 944 generates an RF reproduction signal and a servo control signal according to the incident return light. The servo control signal is output from the photodetector 944 to the servo control system 920. The servo control system 920 performs various servo controls using a gap servo module 921, a tracking servo module 922, a tilt servo module 923, and a spindle servo module 924.

FIG. 45 is a schematic enlarged view of the light condensing element 943 arranged near the optical disk 950. The light collection element 943 will be described with reference to FIGS. 44 and 45.

The condensing element 943 faces the optical disk 950. The condensing element 943 includes a SIL 961 and an aspheric lens 962. The SIL 961 and the aspheric lens 962 create near-field light.

The condensing element 943 further includes a lens holder 963. The lens holder 963 accommodates the SIL 961 and the aspherical lens 962.

The SIL 961 includes a SIL end surface 964 that faces the optical disk 950. Optical disc 950 includes a recording surface 951 that faces SIL end surface 964. Near-field light is applied to the recording surface 951 from the SIL end surface 964.

The optical disc drive device 900 further includes a triaxial actuator 965 attached to the lens holder 963. The triaxial actuator 965 is used as a part of a separation / contact mechanism that separates the light collection element 943 from the recording surface 951.

44 and 45, the triaxial actuator 965 is greatly simplified. The triaxial actuator 965 is formed from elements such as a triaxial coil and a yoke, for example. The servo control system 920 applies a predetermined servo voltage to each coil of the triaxial actuator 965. As a result, a predetermined current flows through each coil of the triaxial actuator 965, and focusing servo and tilt servo control including tracking servo and gap servo are executed.

FIG. 46 is an enlarged schematic view of the optical disk drive device 900 around the optical disk 950. FIG. 47 is a schematic bottom view of the optical disc drive apparatus 900 corresponding to FIG. The optical disk drive device 900 is further described with reference to FIGS. 46 and 47. FIG.

The optical disc drive apparatus 900 further includes a lens cleaning mechanism 970 that cleans the SIL 961 and a disc cleaning mechanism 980 that contacts the recording surface 951 of the optical disc 950 and cleans the recording surface 951. The lens cleaning mechanism 970 contacts the SIL end surface 964. The lens cleaning mechanism 970 is further away from the rotation axis RX of the optical disc 950 than the outer peripheral edge 952 of the optical disc 950 attached to the spindle motor 930.

48A to 48C are schematic views of the lens cleaning mechanism 970. The lens cleaning mechanism 970 will be described with reference to FIGS. 46 to 48C.

48A to 48C, the lens cleaning mechanism 970 may be a cleaner device that cleans the SIL 961 using the cleaning tape 971. The lens cleaning mechanism 970 includes two

spindles

972 and 973 and two

idlers

974 and 975 that define the traveling path of the cleaning tape 971. The cleaning tape 971 travels on the SIL 961 as the

spindles

972 and 973 rotate. The cleaning tape 971 is made of a resin that is sufficiently soft so as not to damage the SIL 961.

46 and 47, the light condensing element 943 moves to the lens cleaning mechanism 970 disposed near the optical disk 950. The condensing element 943 moves up and down below the lens cleaning mechanism 970. As a result, as shown in FIGS. 48A to 48C, the SIL end surface 964 comes into contact with and comes away from the cleaning tape 971. The condensing element 943 may be displaced up and down by the above-described triaxial actuator 965 (for example, a gap servo coil). Alternatively, the condensing element 943 may be displaced up and down by a driving mechanism (not shown) other than the servo system. Alternatively, the lens cleaning mechanism 970 may be designed such that the lens cleaning mechanism 970 approaches the condensing element 943 instead of the condensing element 943.

46 and 47, the disk cleaning mechanism 980 includes a cleaning member 981 that faces the recording surface 951 of the optical disk 950, and a support 982 that supports the cleaning member 981. The support body 982 is moved up and down by a motor (not shown). The cleaning member 981 may be a band having a length substantially equal to the radius of the optical disk 950. The cleaning member 981 is made of, for example, a fiber or a mesh material. Desirably, the cleaning member 981 is formed of a material such as lens paper. The cleaning member 981 contacts the recording surface 951 without removing the recording surface 951 and removes dust.

48A to 48C, when the optical disk 950 is mounted on the optical disk drive device 900, the lens cleaning mechanism 970 cleans the SIL end surface 964. In FIG. 48A, the SIL 961 is separated from the lens cleaning mechanism 970. Thereafter, as shown in FIG. 48B, the SIL 961 moves below the cleaning tape 971. The SIL 961 is displaced upward and comes into contact with the cleaning tape 971. The cleaning tape 971 then travels and removes dust adhering to the end surface of the SIL 961. As shown in FIG. 48C, after the dust is removed using the cleaning tape 971, the cleaning tape 971 is separated from the SIL 961, and the cleaning operation is completed.

The above-described cleaning technique uses direct contact of the cleaning tape 971 to the end surface of the SIL 961. When the cleaning tape 971 contacts the end surface of the SIL 961, the end surface of the SIL 961 may be damaged. Alternatively, dust attached to the cleaning tape 971 may come into contact with the end surface of the SIL 961 again.

In order to prevent re-contact of dust with the SIL 961, an unused surface of the cleaning tape 971 may be brought into contact with the end surface of the SIL 961 using a mechanism for winding the cleaning tape 971. However, this approach faces a limit on the number of times the cleaning tape 971 can be used.

The mechanism for wiping off the dust on the end surface of the SIL 961 and the mechanism for winding the cleaning tape 971 require a large installation space for the optical disc drive device 900.

If the dust is removed using contact with the optical disk 950 and / or the optical head 910, the surface of the optical disk 950 and / or the optical head 910 may be damaged. This means a significant deterioration in performance related to recording and reproduction.

FIG. 49 is a schematic plan view of a conventional hard disk drive device 800. A conventional hard disk drive device 800 will be described with reference to FIG.

The hard disk drive device 800 includes a housing 810. The housing 810 includes a base member 811 and a cover member coupled to the base member 811. In FIG. 49, the cover member is not shown. Therefore, FIG. 49 clearly shows the internal structure of the hard disk drive device 800.

The hard disk drive device 800 further includes a spindle motor 820, a magnetic recording medium 830, an HSA 840, and a voice coil motor (hereinafter referred to as VCM850). The spindle motor 820, the magnetic recording medium 830, the HSA 840, and the VCM 850 are disposed in the housing 810.

The spindle motor 820 is fixed to the base member 811. The spindle motor 820 rotates the magnetic recording medium 830.

The magnetic recording medium 830 is attached to the spindle motor 820. The magnetic recording medium 830 is rotated at high speed by the spindle motor 820. The magnetic recording medium 830 includes a recording area 831 and a non-recording area 832 surrounding the recording area 831. Data is recorded in the recording area 831.

FIG. 50 is a schematic perspective view of HSA840. 49 and 50, the conventional hard disk drive device 800 will be further described.

The HSA 840 includes a slider 841. A magnetic head (not shown) is mounted on the slider 841. The HSA 840 moves the slider 841 to a predetermined position on the magnetic recording medium 830. The magnetic head mounted on the slider 841 performs information processing such as data recording and reproduction on the magnetic recording medium 830.

The HSA 840 further includes a swing arm 842 and a suspension 843 attached to the tip of the swing arm 842. The slider 841 described above is attached to the tip of the suspension 843.

50, the suspension 843 includes a load beam 845 coupled to the tip of the swing arm 842 and a flexure 846 on which the slider 841 is mounted. The curved portion 846 is curved so that the slider 841 approaches the surface of the magnetic recording medium 830. The load beam 845 includes a dimple 847 that protrudes toward the swing arm 842. The slider 841 attached to the bending portion 846 can swing finely with respect to the load beam 845. During this time, the curved portion 846 contacts the dimple 847.

As shown in FIG. 49, the hard disk drive device 800 includes a lamp 860. The suspension 843 includes an end tap 848 that protrudes from the tip of the load beam 845. The ramp 860 contacts the end tap 848 and holds the slider 841.

50, the end tap 848 includes a facing surface 849 that faces the lamp 860, and a protrusion 861 that protrudes from the facing surface 849 toward the lamp 860. Since the protrusion 861 contacts the lamp 860, the contact area between the end tap 848 and the lamp 860 is reduced.

When the magnetic recording medium 830 rotates on the base member 811 at a high speed, a lift acting on the slider 841 is generated. The suspension 843 urges the slider 841 toward the magnetic recording medium 830, while the lift acts so that the slider 841 is separated from the magnetic recording medium 830. As a result, the slider 841 floats to a height position where the lift force and the force of the suspension 843 are balanced, and is held at the height position. A magnetic head (not shown) mounted on the floated slider 841 records data in the recording area 831 of the magnetic recording medium 830. Alternatively, the magnetic head reproduces data from the recording area 831 of the magnetic recording medium 830.

The VCM 850 fixed to the base member 811 transmits the rotational force to the HSA 840. As shown in FIG. 49, the VCM 850 includes a VCM coil 851, magnets 852 arranged above and below the VCM coil 851, and a yoke 853 that supports the magnet 852. The VCM 850 rotates the HSA 840 in a direction according to Fleming's left-hand rule using the interaction formed by the magnet 852 and the current input to the VCM coil 237 under the control of the servo control system.

When the operation of the hard disk drive device 800 is stopped, the VCM 850 rotates the HSA 840 clockwise. As a result, the hard disk drive device 800 changes from a loading state in which the slider 841 is positioned on the recording area 831 of the magnetic recording medium 830 to an unloading state in which the slider 841 moves onto the ramp 860.

When the hard disk drive device 800 is activated, the VCM 850 rotates the HSA 840 counterclockwise. As a result, the hard disk drive device 800 changes from an unloading state in which the slider 841 is held by the ramp 860 to a loading state in which the slider 841 is positioned on the recording area 831 of the magnetic recording medium 830.

49, the hard disk drive device 800 further includes a latch 870. The latch 870 prevents unnecessary rotation of the HSA 840 due to external force, impact, or vibration that can act on the hard disk drive device 800 while the slider 841 is held by the ramp 860 (unloading state). As a result, unnecessary contact between the slider 841 and the magnetic recording medium 830 due to unnecessary rotation of the HSA 840 and damage to the slider 841 and the magnetic recording medium 830 are prevented.

49, the hard disk drive device 800 further includes an FPC 881 attached to the HSA 840, and an FPC bracket 882 disposed below the FPC 881. The FPC bracket 882 is used to connect the FPC 881 to a main circuit board (not shown) disposed below the base member 811. The FPC bracket 882 is disposed at one of the corners of the base member 811.

49, the hard disk drive device 800 further includes a collection filter 890. The collection filter 890 is disposed at the other corner of the base member 811 to which the FPC bracket 882 is attached. The collection filter 890 removes foreign matters such as fine particles in the air flowing in the hard disk drive device 800.

The collection efficiency of the collection filter 890 (ratio of dust to the passage of air containing dust) is, for example, in the range of several percent to 100% for dust having a diameter of 100 nm. The collection efficiency of the collection filter 890 greatly depends on the pressure loss of the collection filter 890 (the roughness of the collection filter 890).

When the magnetic recording medium 830 rotates, an air flow is generated in the hard disk drive device 800. When the air flow generated in the hard disk drive device 800 passes through the collection filter 890 at a flow rate corresponding to the rotational speed of the magnetic recording medium 830, the collection filter 890 is included in the air flow with the collection efficiency of the collection filter 890. Dust can be removed.

If a collection filter 890 having a collection efficiency of 50% is used and the magnetic recording medium 830 is rotating at a rotational speed of several thousand rpm, generally the dust in the hard disk drive device 800 is reduced to about It takes tens of seconds to several minutes to reduce to 1/10. The collection period required for reducing the amount of dust to 1/10 greatly depends on the position of the collection filter 890. In general, the collection filter 890 is disposed on the side of the magnetic recording medium 830 (near the periphery).

The flow velocity of the air flow generated by the rotation of the magnetic recording medium 830 is significantly reduced on the side of the magnetic recording medium 830 as compared with the flow velocity on the surface of the magnetic recording medium 830. Therefore, the period required for dust collection tends to be long.

As described above, the ramp 860 holds the slider 841 when the hard disk drive device 800 is stopped. The slider 841 is fixed to the base member 811 near the periphery of the magnetic recording medium 830.

50, the ramp 860 includes an inclined surface 862 and a stop surface 863. When the end tap 848 moves toward the periphery of the magnetic recording medium 830 (ie, when the end tap 848 moves away from the center of the magnetic recording medium 830), the end tap 848 is separated from the surface of the magnetic recording medium 830. Further, the inclined surface 862 is inclined. The end tap 848 moves along the inclined surface 862 and then stops on the stop surface 863.

The lamp 860 further includes a support surface 864 and a prevention wall 865. The support surface 864 supports the slider 841 while the end tap 848 is stopped on the stop surface 863. During this time, the prevention wall 865 prevents the end tap 848 from leaving the stop surface 863.

FIG. 51 is a partially enlarged plan view of the magnetic recording medium 830. The conventional hard disk drive device 800 will be further described with reference to FIGS.

49, the non-recording area 832 of the magnetic recording medium 830 overlaps the end of the ramp 860 on which the inclined surface 862 is formed. As shown in FIG. 51, the non-recording area 832 includes a bump area 833 along the outer edge of the magnetic recording medium 830, and a boundary area 834 formed between the bump area 833 and the recording area 831. The bump area 833 and the boundary area 834 are annular band areas that are concentric with the rotation center of the magnetic recording medium 830.

51, a large number of fine bumps 835 are formed in the bump region 833. The bumps 835 are formed by irradiating the surface of the magnetic recording medium 830 with laser light and expanding the irradiated region. The size and shape of the fine bump 835 may be adjusted by the wavelength of the laser light and the irradiation intensity. Preferably, the laser beam is irradiated so that the fine bump 835 has an expansion height of 0.1 μm or less.

When the hard disk drive device 800 stops, the HSA 840 rotates clockwise to unload the slider 841. As a result, the slider 841 moves from the recording area 831 toward the non-recording area 832 on the magnetic recording medium 830. When the spindle motor 820 stops, the rotational speed of the magnetic recording medium 830 converges toward “0”. As a result, the lift acting on the slider 841 decreases.

50, the slider 841 includes a facing surface 869 facing the magnetic recording medium 830. A positive pressure that separates the slider 841 from the magnetic recording medium 830 and a negative pressure that attracts the slider 841 to the magnetic recording medium 830 act on the facing surface 869. The above lift acting on the slider 841 may be defined as a resultant force of positive pressure and negative pressure. It is known that the negative pressure acting on the facing surface 869 decreases as the surface roughness of the magnetic recording medium 830 increases. Since the fine bumps 835 formed in the bump region 833 increase the surface roughness of the magnetic recording medium 830, the fine bumps 835 have an attracting force that attracts the slider 841 to the surface of the magnetic recording medium 830 in the non-recording area 832. It can be made difficult to increase.

The end tap 848 of the HSA 840 collides with the inclined surface 862 of the ramp 860. Since the end tap 848 moves at an appropriate speed due to the decrease in the attractive force, the generation of fine particles due to the collision between the end tap 848 and the inclined surface 862 is less likely to occur. The end tap 848 then moves along the inclined surface 862 and eventually stops on the stop surface 863. The slider 841 is stopped on the support surface 864.

The above-described cleaning technique uses the collection filter 890 to remove dust in the hard disk drive device 800. However, since the volume of the hard disk drive device 800 is large, it takes a long time to sufficiently remove the dust in the hard disk drive device 800.

Various components are arranged in the hard disk drive device 800. The large volume and the numerous internal components of the hard disk drive device 800 cause a number of stagnation points for the air flowing in the hard disk drive device 800. Therefore, the collection filter 890 may not be able to sufficiently remove dust in the hard disk drive device.

As described above, the air flow rate is high near the surface of the magnetic recording medium 830, while the air flow rate is low at a position away from the magnetic recording medium 830. Therefore, the collection efficiency of the collection filter 890 greatly depends on the arrangement position of the collection filter 890.

Factors that generate dust in the hard disk drive device 800 include contact between the slider 841 and the magnetic recording medium 830, contact between the protrusion 861 and the lamp 860, evaporation of oil in the fluid bearing portion of the spindle motor 820, and the bearing portion of the VCM 850. Examples include sliding and evaporation of substances such as adhesives and grease.

As with the optical disk 950, the magnetic recording medium 830 also rotates. The negative pressure generated at the center of rotation of these disks is also a major factor that hinders non-contact information processing. If the internal space of the optical disk drive device 900 or the hard disk drive device 800 communicates with the external space, the dust floating in the external space due to the negative pressure generated at the center of rotation of the disk is reflected in the optical disk drive device 900 or the hard disk drive device 800. It will enter the interior space.

The particle size of dust due to the various factors described above is several tens of nm to several μm.

While the magnetic recording medium 830 is rotating, the slider 841 floats from the surface of the magnetic recording medium 830 by a distance of several nm to several tens of nm. If the dust collection efficiency of the collection filter 890 decreases, the dust of several nm to several tens of nm existing in the magnetic recording medium 830 floats on the air current generated by the rotation of the magnetic recording medium 830, and the magnetic recording medium It becomes easy to bite between 830 and the slider 841. This causes scratches or defects on the surface of the magnetic recording medium 830 and makes information processing such as recording and reproduction difficult.

Dust caught between the magnetic recording medium 830 and the slider 841 may greatly change the attitude of the slider 841 that has floated. As the posture of the slider 841 changes, the bending portion 846 may be deformed, and a magnetic head (not shown) incorporated in the slider 841 may be destroyed. As a result, the reliability and performance of recording and reproduction of the hard disk drive device 800 are greatly reduced.

Japanese Patent Laid-Open No. 2004-30821 JP 2007-12126 A JP 2007-87572 A

An object of the present invention is to provide a drive device that is less prone to inconvenience due to dust.

A drive device according to one aspect of the present invention includes a wall portion that defines a storage space in which at least one medium having a processing surface on which information processing is performed is stored, and the information processing in a non-contact manner with respect to the processing surface. And at least one processing element for performing the above and a drive mechanism for rotating the at least one medium. The drive mechanism includes a force generating unit that generates a driving force for rotating the at least one medium, a transmission unit that transmits the driving force to the at least one medium, and the force generating unit on the wall unit. A fixing portion to be fixed. The wall is formed with an opening that allows the transmission portion to pass therethrough. The fixing portion closes the opening in cooperation with the force generating portion.

The drive device of the present invention has high reliability because it is less likely to cause inconvenience due to dust.

The objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

It is a schematic perspective view of the drive device of 1st Embodiment. FIG. 2 is a schematic plan view of the drive device shown in FIG. 1. FIG. 2 is a schematic plan view of the drive device shown in FIG. 1. It is a schematic sectional drawing of the drive device shown by FIG. It is a schematic perspective view of the analysis model used for the analysis of the air flow in the accommodation space of the drive device shown in FIG. It is a figure showing the analysis result regarding the flow of air using the analysis model shown by FIG. 5A. It is a figure showing the analysis result regarding the pressure distribution in the accommodation space using the analysis model shown by FIG. 5A. It is a graph showing the analysis result regarding the removal efficiency of the dust in the accommodation space of the drive device shown by FIG. FIG. 2 is a schematic enlarged cross-sectional view of the drive device shown in FIG. 1. FIG. 2 is a schematic enlarged cross-sectional view of the drive device shown in FIG. 1. It is the schematic showing the control structure of the drive device shown by FIG. It is a schematic sectional drawing of the drive device shown by FIG. It is a schematic sectional drawing of the drive device of 2nd Embodiment. It is a schematic sectional drawing of the dust removal part of the drive device shown by FIG. It is a schematic sectional drawing of the respiration filter of the drive device shown by FIG. It is a schematic sectional drawing of the drying part of the drive device shown by FIG. It is a schematic sectional drawing of the activated carbon part of the drive device shown by FIG. It is a schematic sectional drawing of the drive device of 3rd Embodiment. FIG. 16 is a schematic enlarged view of the drive device shown in FIG. 15. It is a schematic sectional drawing of the drive device of 4th Embodiment. It is the schematic of the structure in the accommodation space of the drive device shown by FIG. FIG. 18 is a schematic enlarged perspective view of the drive device shown in FIG. 17. It is a schematic sectional drawing of the drive device of 5th Embodiment. FIG. 21 is a schematic enlarged cross-sectional view of the drive device shown in FIG. 20. FIG. 21 is a schematic enlarged cross-sectional view of the drive device shown in FIG. 20. It is a schematic sectional drawing of the drive device of 6th Embodiment. It is a flowchart showing the exemplary control by the circuit board of the drive device shown by FIG. It is a schematic sectional drawing of the drive device of 7th Embodiment. It is a schematic sectional drawing of the drive device of an 8th embodiment. It is a schematic sectional drawing of the drive device of 9th Embodiment. It is a schematic perspective view of the analysis model used for analysis of dust removal efficiency. It is a schematic graph showing the analysis result regarding the removal efficiency of the dust obtained using the analysis model shown by FIG. 27A. It is the schematic of the drive device of 10th Embodiment. It is the schematic of the optical head of the drive device shown by FIG. It is a schematic graph showing the relationship between the spot shape of the light on the 4-part light reception area | region of the drive device shown by FIG. FIG. 29 is a schematic plan view of a housing wall of the drive device shown in FIG. 28. FIG. 31B is a schematic cross-sectional view of the accommodation wall shown in FIG. 31A. FIG. 31B is a schematic bottom view of the accommodation wall shown in FIG. 31A. FIG. 29 is a schematic plan view of a housing wall of the drive device shown in FIG. 28. FIG. 32B is a schematic plan view of the accommodation wall of the drive device shown in FIG. 32A. FIG. 32B is a schematic bottom view of the accommodation wall of the drive device shown in FIG. 32A. It is the schematic of the ionizer of the drive device shown by FIG. It is the schematic of the drive device of 11th Embodiment. It is the schematic of the ionizer of the drive device shown by FIG. It is the schematic of the drive device of 12th Embodiment. It is a flowchart showing the exemplary control by the circuit board of the drive device shown by FIG. It is the schematic of the drive device of 13th Embodiment. It is the schematic of the drive device of 14th Embodiment. FIG. 40 is a schematic plan view of the drive device shown in FIG. 39. FIG. 40 is a schematic cross-sectional view of the drive device shown in FIG. 39. It is the schematic of the drive device of 15th Embodiment. FIG. 41B is a schematic plan view of the drive device shown in FIG. 41A. FIG. 41B is a schematic plan view of the drive device shown in FIG. 41A. FIG. 41B is a schematic cross-sectional view of the drive device shown in FIG. 41A. It is the schematic of the drive device of 16th Embodiment. It is the schematic of the conventional optical disk drive device. It is a rough enlarged view of the condensing element of the optical disk drive device shown by FIG. FIG. 45 is an enlarged schematic view of the optical disk drive device shown in FIG. 44. FIG. 45 is a schematic bottom view of the optical disk drive device shown in FIG. 44. FIG. 45 is a schematic view of a lens cleaning mechanism of the optical disk drive device shown in FIG. 44. FIG. 45 is a schematic view of a lens cleaning mechanism of the optical disk drive device shown in FIG. 44. FIG. 45 is a schematic view of a lens cleaning mechanism of the optical disk drive device shown in FIG. 44. It is a schematic plan view of a conventional hard disk drive device. FIG. 50 is a schematic perspective view of the hard disk drive device shown in FIG. 49. FIG. 50 is a partially enlarged plan view of the magnetic recording medium of the hard disk drive device shown in FIG. 49.

Various devices that perform information processing in a non-contact manner will be described with reference to the drawings. In various embodiments described below, the same reference numerals are given to the same components. In addition, for the sake of clarity of the concept of the device, redundant description is omitted as necessary. The structure, arrangement, or shape shown in the drawings and the description related to the drawings are merely for the purpose of easily understanding the principle of the present embodiment. Therefore, the principle of this embodiment is not limited to these.

<First Embodiment>
FIG. 1 is a schematic perspective view of a driving apparatus 100 according to the first embodiment. FIG. 2 is a schematic plan view of the driving apparatus 100 shown in FIG. The driving device 100 will be described with reference to FIGS. 1 and 2.

The driving device 100 includes a magnetic disk 120. The magnetic disk 120 includes a processing surface 121 on which information processing such as recording and reproduction is performed magnetically, and an opposite surface 122 opposite to the processing surface 121. In the present embodiment, the magnetic disk 120 is exemplified as a medium.

The driving apparatus 100 further includes a magnetic head 130 that performs information processing such as recording and reproduction on the processing surface 121 in a non-contact manner. The magnetic head 130 magnetically records information on the magnetic disk 120. Alternatively, the magnetic head 130 magnetically reproduces information from the magnetic disk 120. In the present embodiment, the magnetic head 130 is exemplified as a processing element or a magnetic processing element.

The driving apparatus 100 further includes a holding mechanism 140 that holds the magnetic head 130. The holding mechanism 140 includes a slider 141 that holds the magnetic head 130, a suspension 142 that holds the slider 141, a swing arm 143 that holds the suspension 142, and a voice coil motor 144 that rotates the swing arm 143 on the magnetic disk 120. And including. The air flow generated by the rotation of the magnetic disk 120 causes the slider 141 holding the magnetic head 130 to float from the magnetic disk 120. The suspension 142 supports the slider 141 and the magnetic head 130 via a soft leaf spring structure (not shown: generally referred to as “gimbal”). The voice coil motor 144 is formed from components such as a rotating shaft, a coil, a magnet, and a yoke. A structure used in a known hard disk drive device may be applied to the holding mechanism 140. In the present embodiment, the voice coil motor 144 is exemplified as a rotation motor.

The driving apparatus 100 further includes a signal processing unit 150. The signal processing unit 150 includes an FPC 151 that transmits a signal to or from the magnetic head 130, a head amplifier 152 that amplifies the signal, and a circuit board 153 that performs signal processing. The circuit board 153 may generate a recording signal including information recorded on the magnetic disk 120. The circuit board 153 may process a reproduction signal including information read from the magnetic disk 120 by the magnetic head 130. The recording signal is supplied to the magnetic head 130 through the FPC 151. The magnetic head 130 can record information on the magnetic disk 120 in accordance with a recording signal. The reproduction signal output from the magnetic head 130 is amplified by the head amplifier 152. The circuit board 153 can process the amplified reproduction signal. The information processing technique for the magnetic disk 120 may be a technique used in a known hard disk drive device.

FIG. 3 is a schematic plan view of the driving device 100. FIG. 4 is a schematic cross-sectional view of the driving device 100. The drive device 100 will be further described with reference to FIGS. 3 and 4.

The driving device 100 further includes an accommodation wall 160 that defines an accommodation space 169 in which the magnetic disk 120, the magnetic head 130, and the holding mechanism 140 are accommodated, and a housing 110 that surrounds the accommodation wall 160. The housing 110 includes a bottom wall 112 disposed below the housing wall 160, a top wall 116 disposed above the housing wall 160, and a frame surrounding the housing wall 160 between the bottom wall 112 and the top wall 116. And a wall 113. In this embodiment, the accommodation wall 160 is illustrated as a wall part.

The housing wall 160 includes a first wall 161 lying between the magnetic disk 120 and the top wall 116, a second wall 162 lying between the bottom wall 112 and the magnetic disk 120, and a right side of the first wall 161. A third wall portion 163 connected to the edge and the right edge of the second wall portion 162. The first wall portion 161 cooperates with the second wall portion 162 to form a thin space. The magnetic disk 120 rotates in a space mainly defined by the first wall portion 161 and the second wall portion 162. The first wall portion 161 cooperates with the third wall portion 163 to form a thick space. A voice coil motor 144 is disposed in a space mainly defined by the first wall portion 161 and the third wall portion 163. The voice coil motor 144 is fixed to the third wall portion 163. In the present embodiment, one of the first wall portion 161, the second wall portion 162, and the third wall portion 163 is exemplified as the first wall member. Another one of the first wall portion 161, the second wall portion 162, and the third wall portion 163 is exemplified as the second wall member.

The housing 110 includes a support frame 117. The housing wall 160 is held and positioned in the housing 110 by the support frame 117.

As shown in FIG. 4, the drive device 100 further includes a drive mechanism 170 that rotates the magnetic disk 120. The drive mechanism 170 includes a spindle motor 171. The spindle motor 171 includes a main body 172 that generates a driving force for rotating the magnetic disk 120, and a spindle shaft 173 that protrudes from the main body 172 toward the magnetic disk 120. A spindle hole 164 is formed in the second wall portion 162. The tip of the spindle shaft 173 enters the accommodation space 169 through the spindle hole 164. The magnetic disk 120 is fixed to the tip of the spindle shaft 173. The spindle shaft 173 rotates according to the driving force created by the main body 172. As a result, the magnetic disk 120 rotates in the accommodation space 169. In the present embodiment, the main body 172 is exemplified as a force generation unit. The spindle shaft 173 is exemplified as a force transmission unit. The spindle hole 164 is exemplified as the opening.

The driving mechanism 170 includes a fixing wall 174 for fixing the main body 172 exposed from the accommodation space 169 to the second wall 162. The fixed wall 174 closes the spindle hole 164 in cooperation with the main body 172.

The drive mechanism 170 includes a hub 175 on which the magnetic disk 120 is placed, a cap 176 that sandwiches the magnetic disk 120 in cooperation with the hub 175, and a fixing screw 177 that passes through the cap 176 and is connected to the hub 175. Are further provided. The magnetic disk 120 is accurately fixed on the hub 175 by a cap 176 and a fixing screw 177. Further, the magnetic disk 120 is accurately rotated by the spindle motor 171 at a rotational speed of several thousand rpm.

The drive mechanism 170 includes a shield part 178 that connects the fixed wall 174 to the second wall part 162. The shield part 178 surrounding the spindle hole 164 and the spindle shaft 173 between the fixed wall 174 and the second wall part 162 keeps the shielding agent, adhesive resin, and the fixed wall 174 and the second wall part 162 airtight. It may be formed from a material capable of The rotation of the magnetic disk 120 causes a negative pressure environment around the spindle shaft 173. Since the shield part 178, the fixed wall 174, and the main body part 172 isolate the negative pressure space in the accommodation space 169 from the space between the accommodation wall 160 and the housing 110, the space between the accommodation wall 160 and the housing 110 is separated. Dust drifting in the space becomes difficult to enter the accommodation space 169 through the spindle hole 164. In the present embodiment, the fixing wall 174 and the shield part 178 used for fixing the main body part 172 to the second wall part 162 are exemplified as the fixing part. The fixed wall 174 that supports the main body portion 172 is exemplified as the support portion.

The housing wall 160 has a boundary between the first wall portion 161 and the second wall portion 162, a boundary between the second wall portion 162 and the third wall portion 163, and a boundary between the third wall portion 163 and the first wall portion 161. A seal portion 165 for sealing is included. As a result, the accommodation space 169 is sealed. The shield part 178 and the seal part 165 may be formed of a material such as resin, rubber, or silicon. The first wall 161, the second wall 162, and the third wall 163 may be formed of a metal plate or a resin plate having a thickness of 0.1 mm to 1 mm.

In this embodiment, the voice coil motor 144 is disposed in the accommodation space 169 as a whole. Alternatively, a part of the voice coil motor may be exposed from the receiving space. The housing may include a support frame that supports a part of the voice coil motor exposed from the accommodation space. In this case, the boundary between the voice coil motor and the receiving wall is preferably sealed using a shielding agent or other suitable material.

The magnetic head 130, the slider 141, the suspension 142, and the swing arm 143 rotate along the processing surface 121 of the magnetic disk 120 in the accommodation space 169. During this time, the magnetic head 130 magnetically records information on the magnetic disk 120. Alternatively, the magnetic head 130 magnetically reproduces information from the magnetic disk 120.

The rotation of the magnetic disk 120 causes an air flow (typically a swirl flow) in the accommodation space 169. As a result, the magnetic head 130 and the slider 141 float from the processing surface 121. The flying height of the magnetic head 130 and the slider 141 depends on the design of the holding mechanism 140. Typically, the flying height of the magnetic head 130 and the slider 141 is several nanometers to several tens of nanometers. If dust enters between the magnetic head 130 or the slider 141 and the processing surface 121, the magnetic head 130, the slider 141, and / or the processing surface 121 may be damaged. Damage to the magnetic head 130, the slider 141, and / or the processing surface 121 may significantly reduce the recording performance and / or reproduction performance of the drive device 100.

As described above, the storage space 169 is sealed by the storage wall 160, the shield portion 178, the fixed wall 174, the main body portion 172, and the seal portion 165. Accordingly, dust floating between the accommodation wall 160 and the housing 110 is less likely to enter the accommodation space 169. As a result, the amount of dust in the accommodation space 169 is kept at a low level. This greatly reduces the risk of dust entering between the magnetic head 130 or slider 141 and the processing surface 121. Therefore, there are almost no inconveniences such as crash of the magnetic head 130, recording error and / or reproduction error of the magnetic disk 120, damage to the magnetic head 130, the slider 141 and / or the processing surface 121. Thus, the driving apparatus 100 can maintain the recording performance and / or the reproduction performance at a high level.

In the present embodiment, the storage wall 160 includes a first wall portion 161, a second wall portion 162, and a third wall portion 163. Therefore, the assembly of the magnetic disk 120 and the holding mechanism 140 in the accommodation space 169 is facilitated. Since the 1st wall part 161, the 2nd wall part 162, and the 3rd wall part 163 are sealed with the seal | sticker part 165, the accommodation space 169 will be sealed appropriately.

In the present embodiment, the accommodation wall 160 has a polygonal shape. Alternatively, the receiving wall may be circular concentric with the magnetic disk.

The driving apparatus 100 further includes a dust removing unit 180 that collects dust in the accommodation space 169. The dust removing unit 180 includes an upper collection filter 181 disposed between the processing surface 121 and the first wall portion 161, and a lower collection filter 182 disposed between the opposite surface 122 and the second wall portion 162. ,including. In this embodiment, the dust removal part 180 is illustrated as a collection filter.

The first wall portion 161 includes a first inner surface 166 that faces the processing surface 121. The upper collection filter 181 attached to the first inner surface 166 protrudes toward the processing surface 121. In the present embodiment, the upper collection filter 181 is exemplified as the first filter.

The second wall portion 162 includes a second inner surface 167 that faces the opposite surface 122. The lower collection filter 182 attached to the second inner surface 167 protrudes toward the opposite surface 122. In the present embodiment, the lower collection filter 182 is exemplified as the second filter.

The dust removing unit 180 may be formed of a resin material such as polyethylene or polypropylene. Or the dust removal part 180 may be formed from an electrostatic nonwoven fabric. In this embodiment, even if the coarseness of the dust removing unit 180 is designed so that the collection efficiency capable of collecting about 50% of dust with respect to the passage of dust of about 100 nm is achieved. Good. If the density of the resin in the air passage in the dust removing unit 180 is high, the dust is efficiently collected, while the pressure difference between the upstream and downstream of the dust removing unit 180 (pressure loss). ) Becomes larger. As a result, if the resin density is excessively high, the air flow may avoid the dust removing unit 180. For example, if the dust removing unit 180 is designed to achieve approximately 100% collection efficiency, air hardly passes through the dust removing unit 180. As a result, the dust removal efficiency of the drive device 100 as a whole decreases.

FIG. 5A is a schematic perspective view of an analysis model used for analyzing the air flow in the accommodation space 169. FIG. 5B is an analysis result representing the flow of air in the accommodation space 169. FIG. 5C is an analysis result representing the pressure distribution in the accommodation space 169. With reference to FIG. 4 thru | or FIG. 5C, the analysis result regarding the flow of air in the accommodation space 169 and pressure distribution is demonstrated.

FIG. 5A shows the storage wall 160 that forms the storage space 169, the magnetic disk 120 disposed in the storage space 169, and the upper collection filter 181.

FIG. 5B represents the flow of air in the accommodation space 169 when the magnetic disk 120 rotates using a vector. The length of each vector means the magnitude of the flow velocity. The direction of each vector means the direction of air flow. From the analysis result shown in FIG. 5B, it can be seen that when the magnetic disk 120 rotates, a swirl flow swirling outward from the center of the magnetic disk 120 is generated.

FIG. 5C shows the pressure distribution in the accommodation space 169 when the magnetic disk 120 rotates. From the analysis result shown in FIG. 5C, during the rotation of the magnetic disk 120, the pressure around the center of the magnetic disk 120 (that is, the rotation center) is lower than the pressure around the outer periphery of the magnetic disk 120. I understand.

As described with reference to FIG. 4, the first wall portion 161 is disposed close to the processing surface 121 of the magnetic disk 120. The second wall portion 162 is disposed close to the opposite surface 122 of the magnetic disk 120. As a result, the rotation of the magnetic disk 120 generates a low pressure at the rotation center of the magnetic disk 120, while a high pressure is generated at a position away from the rotation center of the magnetic disk 120. The centrifugal force generated by the rotation of the magnetic disk 120 acts on the air in the accommodation space 169, and the pressure distribution described above is created. The flow velocity of air in the accommodation space 169 is highest on the surface (the processing surface 121 and / or the opposite surface 122) of the magnetic disk 120. For example, if the magnetic disk 120 has a diameter of 3.5 inches and rotates at 7000 rpm, the magnetic disk 120 is separated from the center of rotation of the magnetic disk 120 by a distance of a quarter of the diameter of the magnetic disk 120. The flow velocity of the air swirling outward from the rotation center of the magnetic disk 120 is about 20 m / s.

The flow rate of air in the accommodation space 169 is highest on the surface (the processing surface 121 and / or the opposite surface 122) of the magnetic disk 120. The flow rate of air in the accommodation space 169 decreases as the distance from the surface of the magnetic disk 120 increases. The flow rate of air in the accommodation space 169 increases as the distance from the rotation center of the magnetic disk 120 increases.

The shorter the distance between the storage wall 160 and the magnetic disk 120, the higher the average velocity of the air in the storage space 169. In addition, the air between the housing wall 160 and the magnetic disk 120 is rectified. As a result, the flow of air flowing between the housing wall 160 and the magnetic disk 120 is stabilized. The stabilized air flow can dampen the magnetic disk 120. Therefore, the magnetic disk 120 is less likely to resonate. As a result of the reduction of the vibration of the magnetic disk 120, the distance between the magnetic disk 120 and the magnetic head 130 or the slider 141 becomes substantially constant. Therefore, inconveniences such as a crash of the magnetic head 130, a recording error or a reproduction error of the magnetic disk 120, and damage to the magnetic head 130, the slider 141 and / or the magnetic disk 120 are less likely to occur. As a result, the recording performance and / or reproduction performance of the driving apparatus 100 is maintained at a high level.

In the present embodiment, the distance between the magnetic disk 120 and the housing wall 160 may be designed to have a dimension of 20 μm or more and 5 mm or less. If the distance between the magnetic disk 120 and the housing wall 160 is designed to have a dimension of 20 μm or more and 5 mm or less, the above-described stabilized air flow can be obtained.

As shown in FIG. 4, the magnetic disk 120 includes an outer peripheral surface 128 that defines a circular contour of the magnetic disk 120 between the processing surface 121 and the opposite surface 122. The first wall portion 161 and the second wall portion 162 form an inner peripheral surface 269 that faces the outer peripheral surface 128 between the first inner surface 166 and the second inner surface 167. In the present embodiment, the distance between the outer peripheral surface 128 and the inner peripheral surface 269 is designed to be 10 μm or more and 5 mm or less.

FIG. 6 is a graph showing an analysis result regarding dust removal efficiency. The dust removal efficiency is described with reference to FIGS. 5A and 6.

The vertical axis of the graph shown in Fig. 6 represents the concentration of dust in the accommodation space 169. The horizontal axis of the graph shown in FIG. 6 represents time.

The curve C1 in the graph of FIG. 6 is obtained based on the analysis model described with reference to FIG. 5A. In order to calculate the dust removal efficiency, the diameter of the magnetic disk 120 is set to 3.5 inches, the rotational speed of the magnetic disk 120 is set to 7000 rpm, and the collection efficiency of the upper collection filter 181 is , 50% (with respect to dust having a particle diameter of 100 nm or more). The distance between the housing wall 160 and the magnetic disk 120 is set to 0.5 mm.

The curve C2 in the graph of FIG. 6 represents the dust removal efficiency when the containing wall 160 is removed.

In the absence of the storage wall 160, it takes about 22 seconds to reduce the dust in the storage space 169 to 10%. On the other hand, it takes about 2.5 seconds to reduce the dust in the accommodation space 169 to 10% in the presence of the accommodation wall 160. From this, it can be seen that the storage wall 160 shortens the period required for purification of the storage space 169 to 1/10.

FIG. 7A is a schematic enlarged cross-sectional view of the driving device 100 around the dust removing unit 180. With reference to FIG.6 and FIG.7A, the attachment pattern of the dust removal part 180 is demonstrated.

The dust removing unit 180 includes an upper fixing unit 183 used to fix the upper collection filter 181 to the first wall 161 and a lower fixing unit used to fix the lower collection filter 182 to the second wall 162. 184. The upper fixing part 183 and the lower fixing part 184 may be formed of resin or metal. The upper fixing portion 183 and the lower fixing portion 184 are respectively fixed to the first wall portion 161 and the second wall portion 162 using various attachment methods such as adhesion, bonding, or fitting.

The upper collection filter 181 shown in FIG. 7A protrudes toward the processing surface 121 at an angle of 90 ° with respect to the upper fixing portion 183 (that is, an angle of 90 ° with respect to the Z axis in FIG. 7A). . The lower collection filter 182 shown in FIG. 7A protrudes toward the opposite surface 122 at an angle of 90 ° with respect to the lower fixing portion 184 (that is, an angle of 90 ° with respect to the Z axis in FIG. 7A). .

The first wall 161 and the processing surface 121 cooperate to stably guide the air in the accommodation space 169. Since the upper collection filter 181 protrudes in the air flow guided to the first wall 161 and the processing surface 121, dust is efficiently collected by the upper collection filter 181.

The second wall 162 and the opposite surface 122 cooperate to stably guide the air in the accommodation space 169. Since the lower collection filter 182 protrudes in the flow of air guided to the second wall 162 and the opposite surface 122, dust is efficiently collected by the lower collection filter 182.

As shown in FIG. 6, the collection efficiency of the dust removing unit 180 is 50% (for dust having a particle diameter of 100 nm or more), the rotational speed of the magnetic disk 120 is 7000 rpm, and the magnetic disk 120 is accommodated. If the distance to the wall 160 is 0.2 mm, the period required to remove 90% or more of dust (dust having a particle diameter of 100 nm or more) is about 2.5 seconds or less. If the magnetic disk 120 is rotated for 8 seconds, the dust removing unit 180 can collect 99% or more of dust.

The tips of the upper collection filter 181 protruding from the first wall portion 161 and the lower collection filter 182 protruding from the second wall portion 162 may be as close as possible to the magnetic disk 120. As a result, a large amount of dust in the accommodation space 169 collides with the dust removing unit 180. Therefore, the dust removal unit 180 can efficiently collect dust.

FIG. 7B is a schematic enlarged cross-sectional view of the driving device 100 around the dust removing unit 180. With reference to FIG. 7A and 7B, the other attachment pattern of the dust removal part 180 is demonstrated.

Unlike the mounting pattern described with reference to FIG. 7A, the upper collection filter 181 shown in FIG. 7B has a rotational center of the magnetic disk 120 with respect to the upper fixing portion 183 (that is, with respect to the X axis). It is inclined about 30 ° toward Similarly, the lower collection filter 182 shown in FIG. 7B is inclined about 30 ° toward the rotation center of the magnetic disk 120 with respect to the lower fixing portion 184 (that is, with respect to the X axis).

As described above, the high pressure loss in the dust removing unit 180 tends to generate an air flow that bypasses the dust removing unit 180. As shown in FIG. 7B, if the upper collection filter 181 and the lower collection filter 182 are inclined and attached to the storage wall 160, the amount of air that bypasses the dust removing portion 180 is reduced. As a result, the dust removing unit 180 can efficiently collect dust.

The distance between the first inner surface 166 and the processing surface 121 and the distance between the second inner surface 167 and the opposite surface 122 are designed to be as short as possible. These distances take into consideration design items such as surface deflection of the magnetic disk 120, positional accuracy of the magnetic disk 120, amplitude of the magnetic disk 120 under resonance, a mounting method of the dust removing unit 180, and a mounting area of the dust removing unit 180. May be determined appropriately. For example, these distances may be set in a range of 50 μm to 3 mm.

FIG. 8 is a schematic diagram showing a control structure of the driving apparatus 100. With reference to FIG. 8, the control of the driving apparatus 100 will be described.

The circuit board 153 is disposed outside the accommodation space 169. The circuit board 153 includes a control circuit 154, a signal processing circuit 155, and an input / output circuit 156. The control circuit 154, the signal processing circuit 155, and the input / output circuit 156 generally control the driving device 100.

The control circuit 154 controls the spindle motor 171. The main body 172 generates a driving force under the control of the control circuit 154. The driving force is transmitted to the spindle shaft 173. The hub 175 on which the magnetic disk 120 is placed is attached to the tip of the spindle shaft 173 that extends into the accommodation space 169 through a spindle hole 164 formed in the second wall portion 162. The driving force rotates both the spindle shaft 173 and the hub 175.

The cap 176 is placed on the magnetic disk 120 and connected to the hub 175 by a fixing screw 177. Therefore, when the hub 175 rotates, the magnetic disk 120 sandwiched between the hub 175 and the cap 176 also rotates.

The control circuit 154 controls the voice coil motor 144. The voice coil motor 144 rotates the magnetic head 130 and the slider 141 along the processing surface 121 under the control of the control circuit 154. The magnetic disk 120 includes an inner peripheral region 123 that is closer to the rotation axis RX and an outer peripheral region 124 that is farther from the rotation axis RX than the inner peripheral region 123. The magnetic head 130 and the slider 141 move between the inner peripheral area 123 and the outer peripheral area 124 by the turning operation by the voice coil motor 144.

In this embodiment, the slider 141 floats about 10 nm from the processing surface 121 while the magnetic disk 120 is rotating. The control circuit 154 can control the flying height of the slider 141 with high accuracy.

The magnetic head 130 outputs a signal to the control circuit 154. The control circuit 154 performs tracking control of the magnetic head 130, rotation control of the voice coil motor 144, and rotation control of the spindle motor 171 in accordance with a signal from the magnetic head 130. These controls may be a control technique used in a known hard disk drive device.

The magnetic head 130 reads information from the magnetic disk 120 and generates a reproduction signal. The signal processing circuit 155 processes the reproduction signal and reproduces information. A signal including the reproduced information is output from the signal processing circuit 155 to the input / output circuit 156.

The input / output circuit 156 can receive an external signal including information recorded on the magnetic disk 120. The external signal is output from the input / output circuit 156 to the control circuit 154. The control circuit 154 outputs an external signal as a recording signal to the magnetic head 130. The magnetic head 130 can record information included in the external signal on the magnetic disk 120 in accordance with the recording signal.

FIG. 9 is a schematic cross-sectional view of the driving device 100. The drive device 100 will be described with reference to FIG.

As described above, the driving device 100 includes the housing 110 and the accommodation wall 160 disposed in the housing 110. The housing wall 160 includes a first wall portion 161, a second wall portion 162, and a third wall portion 163. The housing wall 160 includes a boundary between the first wall portion 161 and the second wall portion 162, a boundary between the second wall portion 162 and the third wall portion 163, and the third wall portion 163 and the first wall portion 161. And further includes a seal portion 165 for closing the boundary with the. The housing 110 includes a support frame 117 that supports the accommodation wall 160.

The housing wall 160 is fixed on a support frame 117 erected from the bottom wall 112 of the housing 110. At this time, the housing wall 160 is strongly pressed toward the bottom wall 112. As a result, the seal portion 165 can appropriately close the boundary between the first wall portion 161, the second wall portion 162, and the third wall portion 163.

Before the first wall portion 161 is joined to the second wall portion 162 and the third wall portion 163, the magnetic disk 120 is fitted into the hub 175 attached to the tip of the spindle shaft 173 protruding from the spindle hole 164. As a result, the center of the magnetic disk 120 is accurately matched with the rotation center of the magnetic disk 120. Thereafter, the cap 176 cooperates with the hub 175 to sandwich the inner peripheral area 123 of the magnetic disk 120. The cap 176 and the magnetic disk 120 are fixed to the hub 175 by a fixing screw 177.

In this embodiment, the cap 176 is fixed to the hub 175 using 1 to 8 fixing screws 177. If many fixing screws 177 are used, the interval between the fixing screws 177 is shortened. As a result, the resonance of the magnetic disk 120 is reduced. This means a reduction in vibration NRRO (Non-Repeatable Runout) that is asynchronous with the rotation of the magnetic disk 120.

As a result of the above-described fixing technique of the magnetic disk 120, the distance between the processing surface 121 and the magnetic head 130 is maintained in the range of several nm to several tens of nm. Since the distance between the processing surface 121 and the magnetic head 130 is stabilized, the crash of the magnetic head 130, the recording error and / or the reproduction error of the magnetic disk 120, the magnetic head 130, the slider 141 and / or the magnetic disk 120 Damage is less likely to occur. Therefore, the driving device 100 can maintain the recording performance and / or the reproduction performance at a high level.

The voice coil motor 144 is attached to the third wall portion 163 before the first wall portion 161 is joined to the second wall portion 162 and the third wall portion 163. Thereafter, the first wall portion 161 is joined to the second wall portion 162 and the third wall portion 163 to form an accommodation space 169. When the magnetic disk 120 rotates, air flows in the accommodation space 169. Since the upper collection filter 181 attached to the first wall portion 161 and the lower collection filter 182 attached to the second wall portion 162 collect dust from the air flowing in the accommodation space 169, the processing surface 121. And the magnetic head 130 moved along the processing surface 121 by the voice coil motor 144, dust becomes difficult to bite.

The spindle hole 164 is covered with a shield part 178, a fixed wall 174, and a main body part 172 of the spindle motor 171. Therefore, dust floating in the space between the storage wall 160 and the housing 110 hardly enters the storage space 169. In the present embodiment, the spindle motor 171 includes a fluid bearing 179 that assists the rotation operation. Therefore, the spindle motor 171 has a long life and high rotational accuracy.

As described above, the main body 172 of the spindle motor 171 is partially exposed from the accommodation space 169. Therefore, it becomes easy to be electrically connected to the circuit board 153 disposed between the bottom wall of the housing 110 and the spindle motor 171. In the present embodiment, the circuit board 153 is disposed in the housing 110. Alternatively, the circuit board may be attached outside the housing.

<Second Embodiment>
FIG. 10 is a schematic cross-sectional view of the drive device 100A of the second embodiment. The drive device 100A will be described with reference to FIGS. 5C and 10. In addition, the same code | symbol is attached | subjected with respect to the element same as 1st Embodiment. The description relevant to 1st Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

As in the first embodiment, the driving device 100A includes a housing 110, a magnetic disk 120, a magnetic head 130, a holding mechanism 140, a driving mechanism 170, and a dust removing unit 180. The driving device 100 A further includes an accommodation wall 160 A that defines the accommodation space 169. Similar to the first embodiment, the housing wall 160 A includes a second wall portion 162, a third wall portion 163, and a seal portion 165. The housing wall 160A is attached to the first wall portion 161A and the first wall portion 161A joined to the second wall portion 162 and the third wall portion 163 above the magnetic disk 120 and the holding mechanism 140. And a respiratory filter 168. Unlike the first embodiment, the first wall 161A has an opening formed at a position corresponding to the rotation axis RX of the magnetic disk 120. The respiratory filter 168 closes the opening formed in the first wall portion 161A.

As described with reference to FIG. 5C, when the magnetic disk 120 rotates, a region having a high pressure and a region having a low pressure are formed in the accommodation space 169. The respiratory filter 168 flows out of the air from the housing space 169 to the space between the housing wall 160A and the housing 110 (hereinafter referred to as the external space 199), and the air flows from the external space 199 into the housing space 169. Is acceptable. The coarseness of the breathing filter 168 is designed to prevent dust floating in the external space 199 partitioned from the storage space 169 by the storage wall 160A from flowing into the storage space 169. The breathing filter 168 allows air to flow between the accommodation space 169 and the external space 199, so that an excessively large pressure difference between the accommodation space 169 and the external space 199 is less likely to occur. Therefore, the housing wall 160A, the drive mechanism 170 in the housing space 169, and the holding mechanism 140 in the housing space 169 are not easily deformed. Since various dimensions with respect to the housing wall 160A in the housing space 169 are appropriately maintained, the dustproof performance described in relation to the first embodiment is maintained at a high level. As a result, the driving device 100A can maintain high reliability.

In this embodiment, the eyes of the respiratory filter 168 are finer than the eyes of the dust removing unit 180 (the upper collection filter 181 and the lower collection filter 182) (that is, the fiber interval is narrow). Therefore, the breathing filter 168 has a larger pressure loss than the dust removal unit 180, while collecting dust more efficiently than the dust removal unit 180. Therefore, dust in the external space 199 is difficult to enter the accommodation space 169. As a result, the driving device 100A can maintain high reliability.

The breathing filter 168 exists on the rotation axis RX. As described with reference to FIG. 5C, the pressure around the rotation axis RX is relatively low. Accordingly, the air in the external space 199 efficiently flows into the accommodation space 169 through the breathing filter 168.

The driving device 100A includes a drying unit 185 and an activated carbon unit 186. The drying unit 185 and the activated carbon unit 186 are disposed in the accommodation space 169. The drying unit 185 absorbs moisture in the accommodation space 169. The activated carbon unit 186 absorbs the organic gas in the accommodation space 169. As a result, inconveniences such as recording errors, reproduction errors, and crashes of the magnetic head 130 are less likely to occur. Therefore, the driving device 100A can have stable storage performance and reproduction performance. Thus, the driving device 100A can maintain high reliability.

Activated carbon or desiccant may be blended in the respiratory filter 168. As a result, dry air or air containing almost no organic gas flows into the accommodation space 169.

The amount of water and the amount of organic gas in the storage space 169 are reduced by the activated carbon material and the desiccant material blended in the drying unit 185, the activated carbon unit 186, and the breathing filter 168. As a result, moisture and organic gas are less likely to adhere to the magnetic head 130 and the magnetic disk 120. Therefore, inconveniences such as a crash of the magnetic head 130 are less likely to occur. Thus, the driving device 100A can maintain high reliability.

FIG. 11 is a schematic cross-sectional view of the dust removing portion 180 (the upper collection filter 181 or the lower collection filter 182). The dust removing unit 180 will be described with reference to FIG.

The dust removing unit 180 includes a filter unit 187 that collects dust and a reinforcing unit 188 that maintains the shape of the filter unit 187. The reinforcing part 188 is designed not to excessively obstruct the air flow. Therefore, most of the air goes to the filter unit 187. Since the reinforcing portion 188 reinforces the filter portion 187, the shape of the filter portion 187 is maintained even under the pressure of the air flow. Therefore, the filter unit 187 can appropriately remove dust from the air. The filter part 187 may be formed from polypropylene or an electrostatic nonwoven fabric. The reinforcement part 188 may be formed from polyethylene. The dust removing unit 180 typically generates a pressure loss of about 5 mmAq at a flow rate of 3.2 / min, and achieves a collection efficiency of about 50% for dust having a particle diameter of 100 nm. Designed to.

FIG. 12 is a schematic sectional view of the respiratory filter 168. The respiratory filter 168 is described with reference to FIGS. 10 and 12.

The breathing filter 168 includes a filter part 191 that collects dust and a reinforcing part 192 that maintains the shape of the filter part 191. The filter unit 191 faces the external space 199. The reinforcing portion 192 faces the accommodation space 169. The reinforcing part 192 is designed not to excessively obstruct the flow of air that has passed through the filter part 191. Therefore, the air in the external space 199 flows smoothly into the accommodation space 169. Since the reinforcing portion 192 reinforces the filter portion 191, the filter portion 191 is less likely to be bent into the accommodating space 169 even under a pressure difference around the rotation axis RX. The filter part 187 may be formed from polypropylene. The reinforcement part 188 may be formed from polyethylene. The respiratory filter 168 typically produces a pressure drop of about 50 mmAq at a flow rate of 3.2 / min and achieves a collection efficiency of about 99.9% for 100 nm particle size dust. Designed to do.

FIG. 13 is a schematic cross-sectional view of the drying unit 185. The drying unit 185 will be described with reference to FIG.

The drying unit 185 covers the desiccant 193 that absorbs moisture from the air and the covering unit 194 that covers the desiccant 193. The covering portion 194 is designed to prevent the desiccant 193 from scattering. The desiccant 193 may be silica gel, for example. The drying unit 185 typically generates a pressure loss of about 150 mmAq at a flow rate of 3.2 / min and achieves a collection efficiency of about 99.9% for dust having a particle diameter of 100 nm. Designed to do.

FIG. 14 is a schematic cross-sectional view of the activated carbon portion 186. The activated carbon part 186 is demonstrated with reference to FIG.

The activated carbon part 186 covers the activated carbon 195 that absorbs organic gas and the covering part 196 that covers the activated carbon 195. The covering portion 196 is designed to prevent the activated carbon 195 from scattering. The activated carbon portion 186 typically produces a pressure loss of about 150 mmAq at a flow rate of 3.2 / min and achieves a collection efficiency of about 99.9% for dust having a particle size of 100 nm. Designed to do.

The dust removing unit 180 described in relation to the first embodiment and the second embodiment includes two filters (an upper collection filter 181 and a lower collection filter 182). Alternatively, the number of filter elements that collect dust in the accommodation space may be one or more than two.

In the first embodiment and the second embodiment, the upper collection filter 181 is disposed above the magnetic disk 120, and the lower collection filter 182 is disposed below the magnetic disk 120. Alternatively, the filter element having a dust collecting function may be arranged at an appropriate position according to the shape of the accommodation space.

In the first embodiment and the second embodiment, the driving

devices

100 and 100A perform magnetic recording. The driving

devices

100 and 100A use a magnetic disk 120 as a medium. Alternatively, the driving device may perform assisted magnetic recording by generating plasmon resonance using a laser beam and a metal antenna.

In the first embodiment and the second embodiment, the housing 110 is made of metal. Alternatively, the housing 110 may be formed from resin.

In the present embodiment, the

housing walls

160 and 160A are formed from a thin metal material or resin material. Alternatively, the receiving wall may be formed using various materials capable of forming a sealed receiving space.

<Third Embodiment>
FIG. 15 is a schematic cross-sectional view of the drive device 100B of the third embodiment. The drive device 100B will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 1st Embodiment. The description relevant to 1st Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

As in the first embodiment, the driving device 100B includes a housing 110, a housing wall 160, a driving mechanism 170, a holding mechanism 140, a circuit board 153, and a dust removing unit 180. Unlike the first embodiment, the driving device 100B further includes an optical disc 120B and an optical head 130B that performs non-contact information processing such as recording and reproduction on the optical disc 120B.

FIG. 16 is a schematic enlarged view of the driving device 100B around the optical head 130B. The drive device 100B will be described with reference to FIGS. 15 and 16.

The driving device 100B further includes a semiconductor laser 131 attached to the slider 141. The light beam emitted from the semiconductor laser 131 is used for information processing such as recording and reproduction. The slider 141 is supported by the suspension 142 as in the first embodiment. The suspension 142 is supported by a swing arm 143. In the present embodiment, the semiconductor laser 131 is exemplified as a light source. Note that another device that emits light capable of optically processing information may be used as a light source instead of the semiconductor laser 131.

The optical head 130B includes an optical waveguide 132 and a metal antenna 133. The light beam emitted from the semiconductor laser 131 is guided to the metal antenna 133 through the optical waveguide 132.

The optical disc 120B includes a disk-shaped substrate 125, a first recording layer 126 that covers the upper surface of the substrate 125, and a second recording layer 127 that covers the lower surface of the substrate 125. Both the first recording layer 126 and the second recording layer 127 are formed of a phase change material that undergoes phase change between crystal and amorphous upon receiving light irradiation. When the light beam emitted from the semiconductor laser 131 is guided to the metal antenna 133, the metal antenna 133 focuses on the first recording layer 126 and / or the second recording layer 127. Plasmon resonance occurs between the metal antenna 133 and the first recording layer 126 and between the metal antenna 133 and the second recording layer 127. As a result, the first recording layer 126 and the second recording layer 127 locally change in phase between crystal and amorphous. In the present embodiment, the first recording layer 126 and / or the second recording layer 127 is exemplified as the processing surface. The metal antenna 133 is exemplified as a condensing element or a plasmon resonance antenna.

The driving device 100B further includes a light receiving element (not shown). The optical disc 120B reflects the light beam from the metal antenna 133 and generates reflected light. The light receiving element receives reflected light. The light receiving element outputs a signal (reproduction signal) to the circuit board 153 in response to reception of the reflected light. The magnitude of the signal generated by the light receiving element depends on the intensity of the reflected light. The intensity of the reflected light varies depending on the phase (crystal or amorphous) at the irradiation position of the light beam emitted from the metal antenna 133. Therefore, information recorded on the optical disc 120B is appropriately read using a signal generated by the light receiving element.

<Fourth embodiment>
FIG. 17 is a schematic cross-sectional view of the drive device 100C of the fourth embodiment. The drive device 100C will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 1st Embodiment. The description relevant to 1st Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

Similar to the first embodiment, the drive device 100C includes a housing 110, a magnetic disk 120, a magnetic head 130, a housing wall 160, a drive mechanism 170, a circuit board 153, and a dust removal unit 180. . Unlike the first embodiment, the driving device 100C further includes a holding mechanism 140C.

FIG. 18 is a schematic view of the structure in the accommodation space 169. The holding mechanism 140C will be described with reference to FIGS. In FIG. 18, the first wall portion 161 is removed.

As in the first embodiment, the holding mechanism 140 C is disposed in the accommodation space 169 defined by the accommodation wall 160. As in the first embodiment, the holding mechanism 140C includes a slider 141 that holds the magnetic head 130, a suspension 142 that holds the slider 141, a swing arm 143 that holds the suspension 142, and the swing arm 143 on the magnetic disk 120. And a voice coil motor 144 that is rotated at the same time. Unlike the first embodiment, the holding mechanism 140 C further includes a ramp 145 and a latch 146.

The magnetic head 130, the slider 141, and the suspension 142 are held by the ramp 145 while the driving device 100C is not operating (hereinafter referred to as “unloading”). In the present embodiment, the lamp 145 is exemplified as the holding unit.

The latch 146 locks the swing arm 143 during unloading. Therefore, even when an external force or impact is applied to the driving device 100C during unloading, unnecessary rotation of the swing arm 143 is prevented by the latch 146. As a result, contact between the magnetic head 130, the slider 141, and the magnetic disk 120 and damage due to the contact are less likely to occur.

FIG. 19 is a schematic enlarged perspective view of the holding mechanism 140 C around the lamp 145. The holding mechanism 140C will be further described with reference to FIGS.

The suspension 142 includes a suspension arm 147 connected to the swing arm 143 and a gimbal 148 branched from the suspension arm 147. The gimbal 148 is formed from a soft leaf spring. The slider 141 is attached to the gimbal 148. A dimple 149 is formed on the suspension arm 147. The dimple 149 is used as a fulcrum for the slider 141.

The suspension arm 147 includes an end tap 241. The end tap 241 is formed at the tip of the suspension arm 147. The end tap 241 includes a facing surface 242 that faces the lamp 145 and a protrusion 243 that projects from the facing surface 242. The protrusion 243 reduces the contact area between the end tap 241 and the lamp 145. Therefore, the protrusion 243 reduces wear of the lamp 145 and the end tap 241.

The magnetic disk 120 includes an outer peripheral surface 128 between the processing surface 121 and the opposite surface 122. During unloading, the ramp 145 that holds the slider 141 is disposed near the outer peripheral surface 128. The lamp 145 is fixed to the receiving wall 160. Alternatively, the lamp may be fixed to the housing.

The lamp 145 includes an inclined surface 244 and a stop surface 245. As the end tap 241 moves away from the rotation axis RX, the inclined surface 244 is inclined so as to separate the end tap 241 from the processing surface 121. The end tap 241 moves along the inclined surface 244 and stops on the stop surface 245.

The lamp 145 further includes a support surface 246. The support surface 246 supports the slider 141 while the end tap 241 is stopped on the stop surface 245.

The lamp 145 further includes a prevention wall 247. The end tap 241 stopped on the stop surface 245 is sandwiched between the prevention wall 247 and the stop surface 245. Therefore, the end tap 241 is less likely to be detached from the stop surface 245 even in an environment where an external force or impact is applied.

Dust may be generated by contact between the protrusion 243 and the lamp 145. Since the holding mechanism 140 C is housed in the housing space 169, dust is appropriately collected by the dust removing unit 180. Therefore, the magnetic head 130 crashes, the recording error or the reproduction error with respect to the magnetic disk 120, and the magnetic head 130, the slider 141 and / or the magnetic disk 120 are hardly damaged. Thus, the driving device 100C can maintain the recording performance and the reproduction performance at a high level.

In this embodiment, the driving device 100C performs magnetic recording. The driving device 100C uses a magnetic disk 120 as a medium. Alternatively, the driving device may perform assisted magnetic recording by generating plasmon resonance using a laser beam and a metal antenna. Further alternatively, the medium may be an optical disk as in the third embodiment. In this case, the drive device may optically perform information processing such as recording and reproduction according to the principle of the third embodiment.

<Fifth Embodiment>
FIG. 20 is a schematic cross-sectional view of the drive device 100D of the fifth embodiment. The drive device 100D will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 1st Embodiment. The description relevant to 1st Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

As in the first embodiment, the driving device 100D includes a housing 110, a magnetic disk 120, a magnetic head 130, a holding mechanism 140, a driving mechanism 170, a circuit board 153, and a dust removing unit 180. . Unlike the first embodiment, the drive device 100C further includes an accommodation wall 160D.

As described above, the magnetic disk 120 includes the inner peripheral region 123 and the outer peripheral region 124 surrounding the inner peripheral region 123. The inner peripheral region 123 is sandwiched between the hub 175 and the cap 176. In the present embodiment, the inner peripheral region 123 is exemplified as the inner edge region. The outer periphery area | region 124 is illustrated as an outer edge area | region.

As in the first embodiment, the housing wall 160D includes a third wall portion 163. The housing wall 160D further includes a first wall portion 161D and a second wall portion 162D. The first wall portion 161D includes a step portion 261 that is bent toward the outer peripheral region 124 above the outer peripheral region 124, and a first inner surface 166D that faces the processing surface 121. The first inner surface 166 D includes a first proximity surface 262 that is closer to the processing surface 121 and a first separation surface 263 that is farther from the processing surface 121 than the first proximity surface 262. The first separation surface 263 surrounds the rotation axis RX. The first proximity surface 262 at least partially surrounds the first spacing surface 263. The second wall portion 162D includes a stepped portion 264 that is bent toward the outer peripheral region 124 below the outer peripheral region 124, and a second inner surface 167D that faces the opposite surface 122. The second inner surface 167D includes a second proximity surface 265 that is close to the opposite surface 122, and a second separation surface 266 that is farther from the opposite surface 122 than the second proximity surface 265. The second separation surface 266 surrounds the rotation axis RX. The second proximity surface 265 at least partially surrounds the second spacing surface 266.

FIG. 21A is a schematic enlarged cross-sectional view of the driving device 100D around the

step portions

261 and 264. FIG. With reference to FIG.20 and FIG.21A, the 1st design pattern regarding the accommodation wall 160D is demonstrated.

The first inner surface 166D includes a first upright surface 267 substantially perpendicular to the processing surface 121 in addition to the first proximity surface 262 and the first separation surface 263. The second inner surface 167D includes a second upstanding surface 268 that is substantially perpendicular to the opposite surface 122 in addition to the second proximity surface 265 and the second spacing surface 266.

The accommodation space 169 is narrower between the first proximity surface 262 and the processing surface 121 than between the first separation surface 263 and the processing surface 121. Therefore, when the swirling flow generated by the rotation of the magnetic disk 120 enters the gap between the first proximity surface 262 and the processing surface 121, the swirling flow is stabilized.

The accommodating space 169 is narrower between the second proximity surface 265 and the opposite surface 122 than between the second separation surface 266 and the opposite surface 122. Therefore, the swirl flow that flows between the second proximity surface 265 and the opposite surface 122 is stabilized.

Since the swirling flow that flows near the outer peripheral region 124 is very stabilized, an air spring having high rigidity can be obtained. Since the magnetic disk 120 is less likely to resonate, the relative distance relationship among the slider 141, the magnetic head 130, and the magnetic disk 120 is stabilized. Therefore, a crash of the magnetic head 130, a recording error and / or a reproduction error of the magnetic disk 120, and damage to the magnetic head 130, the slider 141 and the magnetic disk 120 are less likely to occur. As a result, the driving device 100D can maintain the recording performance and / or the reproduction performance at a high level.

FIG. 21B is a schematic enlarged cross-sectional view of the driving device 100D around the

step portions

261 and 264. FIG. With reference to FIG. 21B, the 2nd design pattern regarding the accommodation wall 160D is demonstrated.

The first inner surface 166D includes a first inclined surface 361 inclined with respect to the processing surface 121 in addition to the first proximity surface 262 and the first separation surface 263. The second inner surface 167D includes a second inclined surface 362 that is inclined with respect to the opposite surface 122 in addition to the second proximity surface 265 and the second separation surface 266. The first inclined surface 361 and the second inclined surface 362 gradually narrow the accommodation space 169 toward the outer peripheral region 124. Therefore, the swirl flow generated in the accommodation space 169 can smoothly flow into the space between the first proximity surface 262 and the processing surface 121 and the space between the second proximity surface 265 and the opposite surface 122. . In the space between the first proximity surface 262 and the processing surface 121 and in the space between the second proximity surface 265 and the opposite surface 122, the speed of the swirl flow increases, so that the magnetic disk 120 is appropriately damped. Is done.

In this embodiment, the driving device 100D performs magnetic recording. The driving device 100D uses a magnetic disk 120 as a medium. Alternatively, the driving device may perform assisted magnetic recording by generating plasmon resonance using a laser beam and a metal antenna. Further alternatively, the medium may be an optical disk as in the third embodiment. In this case, the drive device may optically perform information processing such as recording and reproduction according to the principle of the third embodiment.

<Sixth Embodiment>
FIG. 22 is a schematic cross-sectional view of the drive device 100E of the sixth embodiment. The drive device 100E will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 5th Embodiment. The description relevant to 5th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

Similar to the fifth embodiment, the driving device 100E includes a housing 110, a magnetic disk 120, a magnetic head 130, a holding mechanism 140C, a housing wall 160, a driving mechanism 170, a circuit board 153, and a dust removing unit. 180. The driving device 100E further includes a switch element 157 and a capacitor 158. The power supplied from the power source ES is supplied to the circuit board 153, the drive mechanism 170, the holding mechanism 140C, and the magnetic head 130 through the switch element 157 and the capacitor 158. The switch element 157 includes an off mode in which a power path from the power source ES to the circuit board 153, the driving mechanism 170, the holding mechanism 140C, and the magnetic head 130 is cut off, and the circuit board 153, the driving mechanism 170, the holding mechanism 140C, and the magnetism The power supply mode is switched between the on mode in which the power supply path to the head 130 is opened. While the power supply mode is the on mode, the capacitor 158 can store electricity. The circuit board 153, the driving mechanism 170, the holding mechanism 140C, and the magnetic head 130 can operate by consuming electric power stored in the capacitor 158. Therefore, even after the power supply from the power source ES is interrupted, the circuit board 153, the drive mechanism 170, the holding mechanism 140C, and the magnetic head 130 can operate for a predetermined period. In the present embodiment, the switch element 157 is exemplified as a power switch unit. Capacitor 158 is exemplified as a power storage unit.

The circuit board 153 switches control over the drive mechanism 170 between the processing rotation mode and the dust collection rotation mode. The drive mechanism 170 rotates the magnetic disk 120 at a rotation speed appropriate for the magnetic head 130 to record information on the magnetic disk 120 under the processing rotation mode. Alternatively, the drive mechanism 170 rotates the magnetic disk 120 at a rotation speed appropriate for the magnetic head 130 to read information from the magnetic disk 120 under the processing rotation mode. The drive mechanism 170 rotates the magnetic disk 120 at a rotation speed appropriate for the dust removal unit 180 to collect the dust in the accommodation space 169 under the dust collection rotation mode. As a result, a swirl flow at a speed sufficient for the dust removing unit 180 to collect the dust in a short time is generated in the accommodation space 169. In the present embodiment, the circuit board 153 is exemplified as the control unit.

FIG. 23 is a flowchart showing exemplary control by the circuit board 153. The control by the circuit board 153 will be described with reference to FIGS. 18, 19, 22, and 23.

(Step S110)
In step S110, the user operates the switch element 157 to set the power supply mode to the on mode. As a result, a power supply path from the power supply ES to the circuit board 153, the drive mechanism 170, the holding mechanism 140C, and the magnetic head 130 is opened. Step S120 is executed after the power supply path is opened.

(Step S120)
As described with reference to FIGS. 18 and 19, the magnetic head 130 can rotate between the processing position and the retracted position under the control of the circuit board 153. In the processing position, the magnetic head 130 is disposed on the processing surface 121. During this time, the magnetic head 130 magnetically executes information processing such as recording and reproduction. In the retracted position, the magnetic head 130 is separated from the processing surface 121 and disposed on the ramp 145.

In step S120, the circuit board 153 controls the drive mechanism 170 and the holding mechanism 140C in the dust collection rotation mode. The circuit board 153 controls the holding mechanism 140C and arranges the magnetic head 130 and the slider 141 on the ramp 145. The ramp 145 holds the magnetic head 130, the slider 141, and the suspension 142. Thereafter, the circuit board 153 rotates the spindle motor 171 at the first rotation speed. The first rotation speed is higher than the second rotation speed set for the spindle motor 171 in the processing rotation mode. For example, the first rotation speed may be set to several thousand rpm (for example, 5000 rpm or more). When the spindle motor 171 rotates at the first rotation speed for a predetermined period (several seconds to several tens of seconds), step S130 is executed.

(Step S130)
In step S130, the circuit board 153 performs information processing such as recording and reproduction. Thereafter, step S140 is executed.

(Step S140)
The circuit board 153 sets the spindle motor 171 to the second rotation speed. As described above, the second rotation speed is smaller than the first rotation speed set in step S120. Thereafter, the circuit board 153 controls the holding mechanism 140C to rotate the magnetic head 130 and the slider 141 to the processing position. After the magnetic head 130 and the slider 141 are rotated to the processing position, the circuit board 153 performs information processing such as recording or reproduction on the magnetic disk 120 using the magnetic head 130. Thereafter, step S150 is executed.

(Step S150)
In step S150, the circuit board 153 determines whether or not the user has operated the switch element 157 to set the power supply mode to the off mode. If the power supply mode is not set to the off mode, step S160 is executed. If the power supply mode is set to the off mode, step S170 is executed.

(Step S160)
In step S160, the circuit board 153 determines whether the information processing (recording or reproducing process) for the magnetic disk 120 is completed. If the information processing is complete, step S170 is executed. In other cases, step S150 is executed.

(Step S170)
In step S170, the circuit board 153 controls the drive mechanism 170 and the holding mechanism 140C in the dust collection rotation mode. The circuit board 153 controls the holding mechanism 140C and arranges the magnetic head 130 and the slider 141 on the ramp 145. The ramp 145 holds the magnetic head 130, the slider 141, and the suspension 142. Thereafter, the circuit board 153 rotates the spindle motor 171 at the first rotation speed. The spindle motor 171 rotates at the first rotation speed for a predetermined period (several seconds to several tens of seconds).

Also in step S170 after step S150, the circuit board 153 consumes the electric power stored in the capacitor 158 and can appropriately operate the spindle motor 171 and the holding mechanism 140C. Accordingly, the dust that can be attached to the magnetic disk 120, the slider 141, and the magnetic head 130 due to the gravitational action and the Coulomb force is properly captured by the dust removing unit 180 on the swirling flow generated by the rotation of the magnetic disk 120. Become.

The execution of the above-described timely dust collection rotation mode reduces the dust concentration (number) in the accommodation space 169 to 1/100 or less. Therefore, the magnetic head 130 crashes, the magnetic disk 120 recording error and / or the reproduction error, and the magnetic head 130, the slider 141 and / or the magnetic disk 120 are hardly damaged. As a result, the driving device 100E can maintain the recording performance and / or reproduction performance at a high level.

In this embodiment, the dust collection rotation mode is executed after the power supply mode is set to the on mode. Alternatively, the dust collection rotation mode may be executed when the stopped driving device 100E resumes operation.

In this embodiment, the rotation of the spindle motor 171 in the dust collection rotation mode is set to the first rotation speed. Alternatively, the rotation speed of the spindle motor 171 in the dust collection rotation mode may be variable. For example, three levels (high speed rotation level> medium speed rotation level> low speed rotation level) may be set for the rotation speed of the spindle motor 171 under the dust collection rotation mode. Using the three levels of speed settings, the rotational operation of the spindle motor 171 under the dust collection rotation mode may be appropriately designed. The number of repetitions of the combination pattern of the three rotation levels and the combination of the set speed levels may be determined according to the design of the driving device 100E.

In this embodiment, the dust collection rotation mode is executed before and after the processing rotation mode. Alternatively, the dust collection rotation mode and the processing rotation mode may be performed in parallel. For example, the circuit board 153 may execute the control under the dust collection rotation mode without moving the magnetic head 130 and the slider 141 to the retracted position.

In this embodiment, the power supply mode is switched between the on mode and the off mode by an operation on the switch element 157 by the user. Alternatively, the power supply mode may be switched to the off mode when the user removes the plug that connects the driving device 100E and the power source ES. Since the capacitor 158 exists, the driving device 100E can appropriately execute the dust collection rotation mode in the off mode.

In this embodiment, the driving device 100E performs magnetic recording. The driving device 100E uses a magnetic disk 120 as a medium. Alternatively, the driving device may perform assisted magnetic recording by generating plasmon resonance using a laser beam and a metal antenna. Further alternatively, the medium may be an optical disk as in the third embodiment. In this case, the drive device may optically perform information processing such as recording and reproduction according to the principle of the third embodiment.

<Seventh embodiment>
FIG. 24 is a schematic cross-sectional view of the drive device 100F of the seventh embodiment. The drive device 100F will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 1st Embodiment. The description relevant to 1st Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

As in the first embodiment, the driving device 100F includes a housing 110, a magnetic disk 120, a magnetic head 130, a holding mechanism 140, a driving mechanism 170, a circuit board 153, and a dust removing unit 180. . The driving device 100F further includes an accommodation wall 160F. Similar to the first embodiment, the accommodation wall 160 F includes a second wall portion 162 and a third wall portion 163. The housing wall 160F further includes a first wall portion 161F joined to the second wall portion 162 and the third wall portion 163.

Unlike the first embodiment, a first inflow port 363 and a first outflow port 364 are formed in the first wall portion 161F. The first inflow port 363 is formed on the rotation axis RX. The first outlet 364 is formed farther from the rotation axis RX than the first inlet 363.

The driving device 100F further includes a first circulation pipe 301 connected to the first inflow port 363 and the first outflow port 364. As described in relation to the first embodiment, a swirling flow is generated in the accommodation space 169 as the magnetic disk 120 rotates. The air pressure at a position away from the rotation axis RX is higher than the air pressure around the rotation axis RX. Therefore, the air in the accommodation space 169 flows into the first circulation pipe 301 through the first outlet 364. The air that has flowed into the first circulation pipe 301 flows into the accommodation space 169 through the first inflow port 363.

In the present embodiment, the first outflow port 364 is formed near the corner corner of the housing wall 160F, so that air stagnation is less likely to occur at the corner corner of the housing wall 160F. Since the region where the air flow rate is locally slow is less likely to occur, the rate at which dust passes through the dust removing unit 180 (the amount of dust passing per unit time) increases. Therefore, the dust removing unit 180 can capture dust efficiently. As a result, inconveniences such as a crash of the magnetic head 130 and a recording error and / or a reproduction error of the magnetic disk 120 hardly occur. Since the driving device 100F has high reliability, the driving device 100F can maintain the recording performance and / or the reproduction performance at a high level.

<Eighth Embodiment>
FIG. 25 is a schematic cross-sectional view of the drive device 100G of the eighth embodiment. The drive device 100G will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 7th Embodiment. The description relevant to 7th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

Similar to the seventh embodiment, the driving device 100G includes a housing 110, a magnetic disk 120, a magnetic head 130, a holding mechanism 140, a housing wall 160F, a driving mechanism 170, and a circuit board 153. . The driving device 100G further includes a dust removing unit 180G. Similarly to the seventh embodiment, the dust removing unit 180G includes an upper collection filter 181 and a lower collection filter 182. The dust collection unit 180G further includes an additional collection filter 189.

The collection filter 189 is fixed to the first wall 161F near the first outlet 364. As a result, dust contained in the air flowing toward the first outflow portion 364 is efficiently removed by the collection filter 189.

<Ninth Embodiment>
FIG. 26 is a schematic cross-sectional view of the drive device 100H of the ninth embodiment. The drive device 100H will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 7th Embodiment. The description relevant to 7th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

Similarly to the seventh embodiment, the drive device 100H includes a housing 110, a magnetic disk 120, a magnetic head 130, a holding mechanism 140, a circuit board 153, and a first circulation pipe 301. The drive device 100H further includes an accommodation wall 160H, a drive mechanism 170H, and a second circulation pipe 302.

As in the seventh embodiment, the housing wall 160H includes a first wall portion 161F and a second wall portion 162. The housing wall 160H further includes a third wall portion 163H. A second outlet 365 is formed in the third wall portion 163H. When the magnetic disk 120 rotates, the air in the accommodation space 169 flows into the second circulation pipe 302 through the second outflow port 365. The holding mechanism 140 is assembled to the third wall portion 163H so as not to close the second outlet 365.

Similarly to the seventh embodiment, the drive mechanism 170H includes a spindle motor 171, a hub 175, a cap 176, a fixing screw 177, and a shield portion 178. The drive mechanism 170H further includes a fixed wall 174H. A second inlet 366 is formed in the fixed wall 174H. Air that has flowed into the second circulation pipe 302 through the second inlet 366 flows into the accommodation space 169 through the second inlet 366. Therefore, the fixed wall 174H supports the spindle motor 171 so that the spindle motor 171 does not block the second inflow port 366. The second inflow port 366 is formed on the rotation axis RX. The second outlet 365 is formed farther from the rotation axis RX than the second inlet 366. The second circulation pipe 302 is connected to the second outlet 365 and the second inlet 366.

FIG. 27A is a schematic perspective view of an analysis model used for analyzing dust removal efficiency. FIG. 27B is a schematic graph showing an analysis result regarding dust removal efficiency. The dust removal efficiency will be described with reference to FIGS. 24 and 26 to 27B.

In the analysis model shown in FIG. 27A (hereinafter referred to as the first analysis model), a first circulation pipe 301 and a second circulation pipe 302 are shown. The present inventor, in addition to the first analysis model, an analysis model from which the second circulation pipe 302 is removed (hereinafter referred to as a second analysis model), a first circulation pipe 301, a second circulation pipe 302, and An analysis model from which the housing wall 160H was removed (hereinafter referred to as a third analysis model) was prepared, and the removal efficiency was compared between the analysis models. The first analysis model corresponds to the drive device 100H of the present embodiment. The second analysis model corresponds to the drive device 100F described in relation to the seventh embodiment.

The vertical axis of the graph shown in FIG. 27B represents the concentration of dust in the accommodation space 169. The horizontal axis of the graph shown in FIG. 6 represents time.

As is clear from FIG. 27B, the first analysis model and the second analysis model show higher dust removal efficiency than the third analysis model. In the first analysis model, the time required to reduce dust to 1/10 is 1/11 of the third analysis model. In the second analysis model, the time required for reducing dust to 1/10 is 1/8 of the third analysis model.

When comparing the first analysis model and the second analysis model, the first analysis model achieves higher removal efficiency than the second analysis model. Therefore, it can be seen that an increase in circulation pipes contributes to an improvement in removal efficiency.

From the above results, it can be seen that the ratio of the dust passing through the dust removing unit 180 (the amount of passing dust per unit time) of the circulation pipe (the first circulation pipe 301 and / or the second circulation pipe 302) is increased. Therefore, as a result of the circulation pipe (the first circulation pipe 301 and / or the second circulation pipe 302), the dust removing unit 180 can capture dust efficiently. As a result, inconveniences such as a crash of the magnetic head 130 and a recording error and / or a reproduction error of the magnetic disk 120 hardly occur. Since the

driving devices

100F and 100H have high reliability, the

driving devices

100F and 100H can maintain the recording performance and / or the reproduction performance at a high level.

In the present embodiment, the second circulation pipe 302 is disposed below the accommodation wall 160H. Alternatively, the second circulation pipe may be disposed above the accommodation wall. Further alternatively, the first circulation pipe and the second circulation pipe may be disposed below the receiving wall.

In the seventh to ninth embodiments, the

driving devices

100F, 100G, and 100H perform magnetic recording. The

driving devices

100F, 100G, and 100H use the magnetic disk 120 as a medium. Alternatively, the driving device may perform assisted magnetic recording by generating plasmon resonance using a laser beam and a metal antenna. Further alternatively, the medium may be an optical disk as in the third embodiment. In this case, the drive device may optically perform information processing such as recording and reproduction according to the principle of the third embodiment.

<Tenth Embodiment>
FIG. 28 is a schematic diagram of a driving device 400 according to the tenth embodiment. The drive device 400 will be described with reference to FIG.

The driving device 400 includes an optical disc 420, an optical head 430, a circuit board 453, an accommodation wall 460, a driving mechanism 470, a dust removing unit 480, an ionizer 490, and a driving circuit 491. The accommodation wall 460 includes an upper wall portion 461 and a lower wall portion 462 disposed below the upper wall portion 461. In the present embodiment, a gap is formed between the upper wall portion 461 and the lower wall portion 462. Alternatively, the upper wall portion 461 and the lower wall portion 462 may be joined using a seal portion according to the joining technique described in connection with the first embodiment. The upper wall portion 461 and the lower wall portion 462 form an accommodation space 469 in which the optical disc 420 is accommodated.

A slit 463 and a spindle hole 464 are formed in the lower wall portion 462. The spindle hole 464 is formed on the rotation axis RX of the optical disc 420, while the slit 463 is formed away from the rotation axis RX. The optical head 430 partially enters the slit 463. The slit 463 extends along the moving direction of the optical head 430.

The optical disc 420 includes a processing surface 421 that receives information processing such as reproduction and recording, and an opposite surface 422 opposite to the processing surface 421. The optical head 430 moves along the slit 463 and optically scans the processing surface 421. As a result, the driving device 400 can record information on the optical disc 420. Alternatively, the driving device 400 can reproduce information from the optical disc 420.

The driving mechanism 470 includes a spindle motor 471, a fixed wall 474, a shield part 478, a hub 475, a cap 476, and a breathing filter 479. Similar to the first embodiment, the spindle motor 471 includes a main body 472 and a spindle shaft 473 that transmits the driving force generated by the main body 472 to the hub 475 and the optical disc 420. The spindle shaft 473 extends along the rotation axis RX and is inserted into the spindle hole 464. Similar to the first embodiment, the fixed wall 474 joined to the lower wall portion 462 by the shield portion 478 supports the main body portion 472. Similar to the first embodiment, the fixed wall 474 and the main body 472 close the spindle hole 464.

The breathing filter 479 closes a vent hole formed in the fixed wall 474. The breathing filter 479 allows air to flow into the accommodation space 469 while preventing dust from entering the accommodation space 469. The respiratory filter 479 may have the performance described in connection with the second embodiment.

The cap 476 may be magnetically attracted to the hub 475. As a result, the optical disc 420 is sandwiched between the hub 475 and the cap 476. When the driving force generated by the main body 472 is transmitted to the hub 475, the optical disc 420 rotates in the accommodation space 469. As a result, a swirling flow is generated in the accommodation space 469.

FIG. 29 is a schematic diagram of the optical head 430. With reference to FIGS. 28 and 29, the driving device 400 will be further described.

The optical head 430 includes a semiconductor laser 431, a relay lens 432, a beam splitter 433, a collimator lens 434, an objective lens unit 435, an objective lens actuator 436, a hologram element 437, a cylindrical lens 438, and a photodetector. 439. The objective lens unit 435 includes a SIL 531 facing the processing surface 421 of the optical disc 420, an aspheric lens 532 that receives light from the collimator lens 434, and a lens holder 533 that houses the SIL 531 and the aspheric lens 532.

The semiconductor laser 431 emits a light beam used for optical information processing such as recording and reproduction. The relay lens 432 finely adjusts the focal length of the light beam from the semiconductor laser 431. The light beam that has passed through the relay lens 432 enters the beam splitter 433.

The beam splitter 433 reflects the light beam toward the collimator lens 434. The collimator lens 434 converts the light beam into a parallel light beam. Thereafter, the light beam enters the objective lens unit 435.

The aspherical lens 532 and the SIL 531 concentrate the light flux on the processing surface 421 to produce near-field light. The driving device 400 records information on the optical disc 420 using near-field light. Alternatively, the driving device 400 reproduces information from the optical disc 420 using near-field light.

The processing surface 421 of the optical disc 420 reflects or diffracts near-field light to generate reflected light or diffracted light. The reflected light may be used for information reproduction. The reflected light or diffracted light is incident on the objective lens unit 435.

The objective lens actuator 436 drives the objective lens unit in the optical axis direction (focus direction) and the tracking direction (radial direction) of the optical disc 420. The above-described reflected light or diffracted light passes through the objective lens unit 435 and sequentially enters the collimator lens 434 and the beam splitter 433.

The beam splitter 433 allows transmission of reflected light or diffracted light. The reflected light or diffracted light that has passed through the beam splitter 433 then enters the hologram element 437. The hologram element 437 generates a light beam for generating a tracking error signal according to the one beam method (APP method).

The light beam that has passed through the hologram element 437 enters the photodetector 439 through the cylindrical lens 438. The photodetector 439 generates a signal corresponding to the incident position of the light beam. The circuit board 453 uses the signal from the photodetector 439 to perform arithmetic processing and generate a tracking error signal. The circuit board 453 executes tracking servo control for the optical head 430 in accordance with the tracking error signal. As a result, the objective lens unit 435 follows the track of the processing surface 421.

The circuit board 453 generates a focus error signal according to the output signal from the photodetector 439. The circuit board 453 performs focus servo control on the optical head 430. As a result, even if the processing surface 421 of the optical disc 420 vibrates, the relative distance between the processing surface 421 and the objective lens unit 435 is kept substantially constant.

The circuit board 453 may read information recorded on the optical disc 420 based on an output signal from the photodetector 439.

28, the driving device 400 further includes a traverse device 530 that supports the optical head 430. The traverse device 530 moves the optical head 430 along the slit 463.

The circuit board 453 includes a control circuit 454, a signal processing circuit 455, and an input / output circuit 456. The control circuit 454 executes the tracking servo control and the focus servo control described above. The control circuit 454 controls the traverse device 530 and adjusts the position of the optical head 430. The control circuit 454 controls the spindle motor 471 and adjusts the rotation of the optical disc 420.

The control circuit 454 may generate a signal representing information recorded on the optical disc 420 according to the output signal of the photodetector 439. The signal processing circuit 455 processes the signal output from the control circuit 454 and generates a reproduction signal. The reproduction signal is then output to an external device (not shown) through the input / output circuit 456. The external device reproduces information according to the reproduction signal.

The input / output circuit 456 may receive a signal from an external device. The signal from the external device may include information recorded on the optical disc 420. The signal processing circuit 455 processes a signal from the input / output circuit 456 and generates a recording signal. The recording signal is output to the control circuit 454. The control circuit 454 controls the optical head 430 according to the recording signal and writes information on the optical disc 420.

The SIL 531 includes a SIL end surface 534 that faces the processing surface 421. The circuit board 453 controls the gap between the processing surface 421 and the SIL end surface 534. As a result, the gap between the processing surface 421 and the SIL end surface 534 is maintained at a distance (near field) where near-field light is generated. If the semiconductor laser 431 emits laser light having a short wavelength, the gap between the processing surface 421 and the SIL end surface 534 is set to several tens of nm. In the present embodiment, the gap between the processing surface 421 and the SIL end surface 534 is set in the range of 20 nm to 30 nm.

The photodetector 439 includes a four-divided light receiving region 535. Quadrant light receiving region 535 receives light from SIL end surface 534. The circuit board 453 controls the gap between the processing surface 421 and the SIL end surface 534 (gap control) so that the total amount of light received by the four-divided light receiving region 535 (total reflection return light) becomes substantially constant. .

The drive circuit 491 drives the ionizer 490 under the control of the circuit board 453. The ionizer 490 emits positive ions and negative ions into the accommodation space 469. As a result, the dust in the accommodation space 469 is not easily charged. Therefore, dust hardly adheres to the optical disc 420 and the SIL end surface 534. In the present embodiment, the drive circuit 491 and the ionizer 490 are exemplified as the ion emission unit.

As in the first embodiment, the distance between the housing wall 460 and the optical disc 420 is set to be very short. The housing wall 460 substantially surrounds the optical disc 420. Accordingly, a very fast swirling flow along the processing surface 421 and the opposite surface 422 is generated.

The dust removing portion 480 is attached to the upper wall portion 461. A part of the swirling flow generated in the accommodation space 469 passes through the dust removing portion 480. At this time, the dust removing unit 480 can remove dust from the swirling flow. The dust removal efficiency of the dust removing unit 480 may be determined in consideration of factors such as the pressure loss of the dust removing unit 480.

The dust removing unit 480 may be a non-electric filter. If the dust removing unit 480 is a non-electric filter, the surface of the dust removing unit 480 is not charged with “+” or “−”. Therefore, the positive ions and / or the negative ions released from the ionizer 490 are hardly bonded to the surface of the dust removing portion 480. As a result, the dust removing unit 480 can maintain high collection efficiency over a long period of time. Note that an electric filter may be used as the dust removing unit 480 as necessary. Even with an electric filter, dust is properly removed from the air. In this embodiment, the dust removal part 480 is illustrated as a collection filter.

In the present embodiment, one dust removing unit 480 is installed in the accommodation space 469. Alternatively, a plurality of dust removing units may be arranged in the accommodation space. The position and number of the dust removal units may be appropriately determined according to the size and shape of the accommodation space.

The dust removing unit 480 may be formed of a resin such as polypropylene. The dust removing unit 480 may include a fiber layer having a lattice structure with a predetermined lattice interval. In the present embodiment, the dust removing unit 480 is designed such that every time dust having a particle diameter of 50 nm or 100 nm passes through the dust removing unit 480, tens of percent or more of dust is removed. The dust removal unit 480 is designed so that the pressure loss caused by the dust removal unit 480 is in the range of several mmAq to several tens mmAq.

The ionizer 490 includes one electrode needle 492 attached to the upper wall portion 461 on the rotation axis RX, and an application circuit 493 that applies a voltage to the electrode needle 492. The electrode needle 492 protrudes downward within the accommodation space 469. The ionizer 490 may selectively release positive ions and negative ions from the electrode needle 492 into the accommodation space 469. For example, the ionizer 490 may alternately repeat a discharge operation for releasing positive ions for a predetermined period and a discharge operation for discharging negative ions for a predetermined period. The control circuit 454 and / or the input / output circuit 456 of the circuit board 453 may synchronize the operation of the spindle motor 471 and the operation of the ionizer 490. In the present embodiment, the application circuit 493 is exemplified as the application unit.

As in the first embodiment, when the spindle motor 471 rotates the optical disk 420 at a rotational speed of several thousand rpm, a swirling flow with a flow rate of several tens of m / s is generated in the accommodation space 469. When the ionizer 490 releases positive ions and negative ions from the electrode needles 492 into the receiving space 469 in an environment where a swirling flow is generated, the positive ions and the negative ions are emitted from the inner surface of the receiving wall 460 that defines the receiving space 469, the optical disc. Bonds to dust in the surface of 420, the SIL end surface 534 and the accommodation space 469.

If negative ions are released from the electrode needle 492 while dust in the inner surface of the storage wall 460, the surface of the optical disk 420, the SIL end surface 534 and / or the storage space 469 is positively charged, the inner surface of the storage wall 460 The positive charge of dust in the surface of the optical disc 420, the SIL end surface 534, and / or the accommodation space 469 binds to negative ions. As a result, the inner surface of the storage wall 460, the surface of the optical disc 420, the SIL end surface 534 and / or the dust in the storage space 469 are electrically neutralized. As a result of the release of negative ions, the dust on the inner surface of the storage wall 460, the surface of the optical disk 420, the SIL end surface 534 and / or the storage space 469 is neutralized, so the Coulomb force is reduced. Therefore, the dust in the accommodation space 469 is less likely to adhere to the inner surface of the accommodation wall 460, the surface of the optical disc 420, and the SIL end surface 534. As a result, the risk that dust enters between the processing surface 421 and the SIL end surface 534 is greatly reduced. Therefore, the processing surface 421 and the SIL end surface 534 are hardly damaged.

FIG. 30 is a schematic graph showing the relationship between the spot shape of light on the four-divided light receiving region 535 used for the gap control described above and total reflected return light. The gap control will be described with reference to FIGS. 29 and 30. FIG.

If the distance relationship between the SIL end surface 534 and the processing surface 421 is in a far field state (generally, a gap of 100 nm or more), only the light beam corresponding to the total reflection region of the SIL end surface 534 is reflected, and the light is divided into four parts. The light enters the region 535. Therefore, a donut-shaped light distribution is obtained.

If the processing surface 421 contacts the SIL end surface 534, the reflection in the total reflection region of the SIL end surface 534 is eliminated. As a result, the amount of reflected light from the SIL end surface 534 is greatly reduced (becomes substantially 0 mV). In this embodiment, the refractive index of the cover layer 429 that forms the SIL 531 and the processing surface 421 is both set to about 2.

The gap control depends on the gain setting of the light receiving unit of the photodetector 439. In this embodiment, the gain of the photodetector 439 is set so that a voltage signal of about 150 mV is output when a gap of about 25 nm is obtained. The operation of the objective lens actuator 436 in the focus direction is controlled according to the voltage signal from the photodetector 439.

FIG. 31A is a schematic plan view of the accommodation wall 460. FIG. 31B is a schematic cross-sectional view of the accommodation wall 460. FIG. 31C is a schematic bottom view of the accommodation wall 460. The operation of the driving device 400 will be described with reference to FIGS. 28, 29, and 31A to 31C.

The optical disc 420 is installed on the hub 475. Thereafter, the cap 476 is installed on the hub 475 and the optical disc 420. Cap 476 is magnetically attracted to hub 475. As a result, the optical disc 420 is stably sandwiched between the hub 475 and the cap 476.

When the spindle motor 471 rotates, the optical disk 420 also rotates. In the present embodiment, the spindle motor 471 rotates the optical disc 420 clockwise. Alternatively, the spindle motor 471 may rotate the optical disc 420 counterclockwise.

29, the aspherical lens 532 and the SIL 531 are held by the lens holder 533. As shown in FIG. 31A, the objective lens actuator 436 includes a suspension 536 that elastically supports the lens holder 533. The lens holder 533 that holds the aspheric lens 532 and the SIL 531 is moved in the tracking direction and the focus direction by the objective lens actuator 436. The objective lens actuator 436 may be held on an optical base (not shown) of the optical head 430. The objective lens actuator 436 moves the lens holder 533 in the radial direction of the optical disc 420. The movable range MR of the lens holder 533 is determined according to the length of the slit 463. A part of the lens holder 533 moving along the slit 463 and the SIL 531 enter the accommodation space 469 through the slit 463.

FIG. 32A is a schematic plan view of the accommodation wall 460. FIG. 32B is a schematic cross-sectional view of the accommodation wall 460. FIG. 32C is a schematic bottom view of the receiving wall 460. With reference to FIG. 32A thru | or FIG. 32C, the flow of the air in the accommodation space 469 is demonstrated.

32A and 32C, the arrow AF schematically represents the flow of air in the accommodation space 469. An arrow DR in FIGS. 32A and 32C schematically represents the rotation of the optical disc 420.

When the optical disc 420 rotates around the rotation axis RX, a swirl flow that rotates around the rotation axis RX is generated between the upper wall portion 461 and the opposite surface 422. The swirling flow is directed away from the rotation axis RX.

The optical disc 420 includes an inner peripheral region 423 sandwiched between the hub 475 and the cap 476 and an outer peripheral region 424 that surrounds the inner peripheral region 423 along the outer peripheral edge 425 of the optical disc 420. The speed of the swirling flow generated between the upper wall portion 461 and the opposite surface 422 is larger in the outer peripheral region 424 than in the inner peripheral region 423. Further, the pressure in the accommodation space 469 is larger in the outer peripheral region 424 than in the inner peripheral region 423. As a result, a swirling flow from the inner peripheral region 423 toward the outer peripheral region 424 is generated between the upper wall portion 461 and the opposite surface 422.

When the optical disk 420 rotates around the rotation axis RX, a swirl flow that rotates around the rotation axis RX is generated between the lower wall portion 462 and the processing surface 421. The swirling flow is directed away from the rotation axis RX.

The speed of the swirling flow generated between the lower wall portion 462 and the processing surface 421 is larger in the outer peripheral area 424 than in the inner peripheral area 423. Further, the pressure in the accommodation space 469 is larger in the outer peripheral region 424 than in the inner peripheral region 423. As a result, a swirl flow from the inner peripheral region 423 toward the outer peripheral region 424 is generated between the lower wall portion 462 and the processing surface 421.

32B, a respiratory filter 479 is attached to the fixed wall 474. As shown in FIG. The breathing filter 479 allows air containing almost no dust to flow into the accommodation space 469. As described above, since the pressure around the rotation axis RX is relatively low, air existing outside the accommodation space 469 can flow into the accommodation space 469 through the breathing filter 479.

The air that has passed through the breathing filter 479 flows into the accommodation space 469 through the spindle hole 464. Thereafter, the air becomes a swirling flow represented by the arrow AF in FIGS. 32A and 32C.

32B, the air existing outside the accommodation space 469 may also flow into the accommodation space 469 from the region of the slit 463 close to the rotation axis RX. The air that flows into the accommodation space 469 through the slit 463 also becomes a swirl flow represented by the arrow AF in FIGS. 28, 32A, and 32C.

As described above, the air pressure around the outer peripheral region 424 is relatively high. As a result, air flows out from the gap between the upper wall portion 461 and the lower wall portion 462. The air in the accommodation space 469 can also flow out from the region of the slit 463 away from the rotation axis RX. The total amount of air flowing out from the gap between the upper wall portion 461 and the lower wall portion 462 and the slit 463 is substantially equal to the total amount of air flowing into the accommodation space 469 through the slit 463 and the breathing filter 479.

The upper wall portion 461 is very close to the opposite surface 422. The lower wall portion 462 is very close to the processing surface 421. In addition, the housing wall 460 covers the optical disk 420 substantially entirely. Therefore, the average flow velocity of the swirling flow generated between the upper wall portion 461 and the opposite surface 422 and between the lower wall portion 462 and the processing surface 421 is increased. Further, the speed of the swirl flow is stabilized.

As described above, a negative pressure is generated around the inner peripheral region 423. Further, a positive pressure is generated around the outer peripheral region 424. Therefore, the swirling flow flows at a high and stable speed from the inner peripheral region 423 toward the outer peripheral region 424.

32B, the electrode needle 492 is disposed on the rotation axis RX in the accommodation space 469. As shown in FIG. When the positive ions and the negative ions are released from the electrode needle 492 into the accommodation space 469, the positive ions and the negative ions ride on the swirling flow and are dispersed over substantially the entire area of the accommodation space 469. Therefore, the dust in the optical disk 420, the SIL end surface 534, and the accommodation space 469 is efficiently discharged. Therefore, the dust in the accommodation space 469 becomes difficult to adhere to the optical disc 420 and the SIL end surface 534. Since the optical disk 420 and the SIL end surface 534 are less likely to be damaged due to dust entering between the optical disk 420 and the SIL end surface 534, the driving device 400 has high reliability.

FIG. 33 is a schematic diagram of the ionizer 490. The ionizer 490 will be described with reference to FIGS. 28 and 33.

As described above, the ionizer 490 includes the electrode needle 492 and the application circuit 493. The application circuit 493 includes a first power supply unit 591 for discharging positive ions from the electrode needle 492, a second power supply unit 592 for discharging negative ions from the electrode needle 492, a first power supply unit 591, and a second power supply. And an earth electrode 593 for grounding the portion 592. The first power supply unit 591 and the second power supply unit 592 apply a high voltage to the electrode needle 492 to generate positive ions and negative ions, respectively.

The drive circuit 491 adjusts the timing of voltage application by the first power supply unit 591 and the second power supply unit 592 according to the output signal from the circuit board 453. The drive circuit 491 alternately performs control to release positive ions from the electrode needle 492 for a predetermined period and control to release negative ions from the electrode needle 492 to the first power supply unit 591 and the second power supply unit 592 for a predetermined period. It may be executed. For example, the drive circuit 491 may synchronize the voltage application operation by the first power supply unit 591 and / or the second power supply unit 592 with the operation of the spindle motor 471.

<Eleventh embodiment>
FIG. 34 is a schematic diagram of the drive device 400I of the eleventh embodiment. With reference to FIG. 34, drive device 400I will be described. In addition, the same code | symbol is attached | subjected with respect to the element same as 10th Embodiment. The description relevant to 10th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

Similarly to the tenth embodiment, the driving device 400I includes an optical disk 420, an optical head 430, a circuit board 453, a housing wall 460, a driving mechanism 470, a dust removing unit 480, and a driving circuit 491. The driving device 400I further includes an ionizer 490I. Similar to the tenth embodiment, the ionizer 490I includes an application circuit 493. The ionizer 490I further includes a plus electrode needle 494 and a minus electrode needle 495. Both the positive electrode needle 494 and the negative electrode needle 495 are disposed in the accommodation space 469. The positive electrode needle 494 exclusively releases positive ions into the accommodation space 469. The negative electrode needle 495 exclusively releases negative ions into the accommodation space 469.

FIG. 35 is a schematic diagram of the ionizer 490I. The ionizer 490I is described with reference to FIG. 34 and FIG.

The plus electrode needle 494 is electrically connected to the first power supply unit 591. The negative electrode needle 495 is electrically connected to the second power supply unit 592. The drive circuit 491 adjusts the timing of voltage application by the first power supply unit 591 and the second power supply unit 592 according to the output signal from the circuit board 453. The drive circuit 491 controls the first power supply unit 591 and the second power supply unit 592 to release positive ions from the positive electrode needle 494 for a predetermined period, and control to release negative ions from the negative electrode needle 495 for a predetermined period; May be executed alternately. For example, the drive circuit 491 may synchronize the voltage application operation by the first power supply unit 591 and / or the second power supply unit 592 with the operation of the spindle motor 471.

The position and number of electrode needles described in relation to the tenth and eleventh embodiments should not be interpreted in a limited manner. The position and number of electrode needles may be appropriately determined according to the size and shape of the accommodation space.

The ion generation described in relation to the tenth and eleventh embodiments uses corona discharge. Alternatively, positive ions and negative ions may be generated utilizing ionizing radiation. Examples of the ionizing radiation include soft X-rays, α rays, and ultraviolet rays.

<Twelfth embodiment>
FIG. 36 is a schematic view of a driving device 400J of the twelfth embodiment. The drive device 400J will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 10th Embodiment. The description relevant to 10th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

Similarly to the tenth embodiment, the driving device 400J includes an optical disc 420, an optical head 430, a circuit board 453, a housing wall 460, a driving mechanism 470, a dust removing unit 480, an ionizer 490, and a driving circuit 491. . The driving device 400J further includes a switch element 457 and a capacitor 458. The power supplied from the power source ES is supplied to the circuit board 453, the drive mechanism 470, the optical head 430, the drive circuit 491, and the ionizer 490 through the switch element 457 and the capacitor 458. The switch element 457 includes an off mode for cutting off a power path from the power source ES to the circuit board 453, the driving mechanism 470, the optical head 430, the driving circuit 491, and the ionizer 490; 430, the power supply mode is switched between the ON mode in which the power supply path to the drive circuit 491 and the ionizer 490 is opened. While the power supply mode is the on mode, the capacitor 458 can store electricity. The circuit board 453, the drive mechanism 470, the optical head 430, the drive circuit 491, and the ionizer 490 can operate by consuming electric power stored in the capacitor 458. Therefore, even after the power supply from the power source ES is interrupted, the circuit board 453, the drive mechanism 470, the optical head 430, the drive circuit 491, and the ionizer 490 can operate for a predetermined period. In the present embodiment, the switch element 457 is exemplified as a power switch unit. Capacitor 458 is exemplified as a power storage unit.

The circuit board 453 switches control over the drive mechanism 470 and the drive circuit 491 between the processing rotation mode and the dust collection rotation mode. The drive mechanism 470 rotates the optical disc 420 at a rotation speed appropriate for the optical head 430 to record information on the optical disc 420 in the processing rotation mode. Alternatively, the drive mechanism 470 rotates the optical disc 420 at a rotation speed appropriate for the optical head 430 to read information from the optical disc 420 under the processing rotation mode. The drive mechanism 470 rotates the optical disc 420 at a rotation speed appropriate for the dust removal unit 480 to collect the dust in the accommodation space 469 in the dust collection rotation mode. As a result, a swirling flow having a speed sufficient for the dust removing unit 480 to collect the dust in a short time is generated in the accommodation space 469. During the dust collection rotation mode, the ionizer 490 generates positive ions and negative ions in the accommodation space 469 under the control of the circuit board 453. In the present embodiment, the circuit board 453 is exemplified as the control unit.

FIG. 37 is a flowchart showing exemplary control by the circuit board 453. The control by the circuit board 453 will be described with reference to FIGS.

(Step S210)
In step S210, the user operates the switch element 457 to switch the power supply mode from the off mode to the on mode. As a result, a power supply path from the power supply ES to the circuit board 453, the drive mechanism 470, the optical head 430, the drive circuit 491, and the ionizer 490 is opened. After the power supply path is opened, step S220 is executed.

(Step S220)
In step S220, the circuit board 153 controls the optical head 430, the drive mechanism 470, and the ionizer 490 in the dust collection rotation mode. The ionizer 490 selectively releases positive ions and negative ions into the accommodation space 469 under the control of the circuit board 453. While the ions are being released, the spindle motor 471 rotates at a first rotation speed larger than the second rotation speed set in the spindle motor 471 in the processing rotation mode, and lower than the first rotation speed. The low-speed rotation operation that rotates at the third rotation speed is executed alternately. The positive ions and the negative ions are diffused widely in the accommodation space 469 by the high-speed rotation operation. During the low-speed rotation operation, ions are efficiently bound to the dust in the optical disc 420, the SIL end surface 534, and the accommodation space 469. The third rotation speed may be a speed of “0” (that is, a stop operation). The ionizer 490 may discharge positive ions and negative ions into the accommodation space 469 in synchronization with the execution cycle of the high-speed rotation operation and the low-speed rotation operation. For example, ions may be released during low speed rotation operation. The ions may be diffused widely by the subsequent high-speed rotation operation. When ion emission is executed for a predetermined time (several seconds to several tens of seconds), step S230 is executed. The activation of the ionizer 490 and the activation of the spindle motor 471 may be performed simultaneously. Alternatively, the ionizer 490 may be activated earlier than the spindle motor 471. Further alternatively, the ionizer 490 may be activated after the spindle motor 471.

(Step S230)
In step S230, the circuit board 453 executes information processing such as recording and reproduction. Thereafter, step S240 is executed.

(Step S240)
The circuit board 453 sets the spindle motor 471 to the second rotation speed. As described above, the second rotation speed is smaller than the first rotation speed set in step S220. The circuit board 453 moves the optical head 430 along the slit 463. During the movement of the optical head 430, the circuit board 453 performs information processing such as recording or reproduction on the optical disc 420 using the optical head 430. Thereafter, step S250 is executed.

(Step S250)
In step S250, the circuit board 453 determines whether or not the user has operated the switch element 457 to switch the power supply mode from the on mode to the off mode. If the power supply mode is not set to the off mode, step S260 is executed. If the power supply mode is set to the off mode, step S270 is executed.

(Step S260)
In step S260, the circuit board 453 determines whether or not the information processing (recording or reproducing process) for the optical disc 420 has been completed. If the information processing has been completed, step S270 is executed. In other cases, step S250 is executed. Note that the completion of information processing may be determined based on the end of communication of the recording signal and the reproduction signal. Alternatively, the completion of information processing may be determined based on the mechanical displacement timing of the optical head 430 and other appropriate criteria.

(Step S270)
In step S270, the circuit board 453 controls the drive mechanism 470 and the ionizer 490 in the dust collection rotation mode. The ionizer 490 selectively releases positive ions and negative ions into the accommodation space 469 under the control of the circuit board 453. While the ions are being released, the spindle motor 471 alternately performs a high-speed rotation operation and a low-speed rotation operation. The ionizer 490 may discharge positive ions and negative ions into the accommodation space 469 in synchronization with the execution cycle of the high-speed rotation operation and the low-speed rotation operation.

Also in step S270 after step S250, the circuit board 453 consumes the electric power stored in the capacitor 458, and can operate the spindle motor 471 and the ionizer 490 appropriately. Accordingly, the dust that can be attached to the optical disc 420 and the SIL end surface 534 by the gravitational action and the Coulomb force is properly captured by the dust removing unit 480 on the swirling flow generated by the rotation of the optical disc 420. Alternatively, the dust is appropriately discharged from the accommodation space 469.

The relationship between the ion emission timing and the rotation operation switching timing of the spindle motor 471 in the dust collection rotation mode should not be interpreted in a limited way. Further, the rotation operation of the spindle motor 471 may not be switched. For example, ions may be emitted while the spindle motor 471 rotates the optical disc 420 at the second rotation speed set in the processing rotation mode. Alternatively, ions may be emitted while the spindle motor 471 rotates the optical disc 420 at a speed lower than the second rotational speed.

In the present embodiment, the dust collection rotation mode is executed in a period of several seconds to several tens of seconds. The period of the dust collection rotation mode may be appropriately determined according to the ion emission amount, the setting of the rotation operation of the spindle motor, and the size and shape of the accommodation space. The release period of positive ions and negative ions may be set independently. The setting of the rotation operation of the spindle motor (for example, the period and the number of repetitions of the high-speed rotation operation and the low-speed rotation operation) is appropriately determined according to the ion emission amount, the setting of the rotation operation of the spindle motor and the size and shape of the accommodation space. May be.

In this embodiment, ions are released during the dust collection rotation mode. Alternatively, ions may be ejected during the process rotation mode.

In the present embodiment, the power supply mode is switched between the on mode and the off mode by an operation on the switch element 457 by the user. Alternatively, the power supply mode may be switched to the off mode when the user removes the plug that connects the driving device 400J and the power source ES. Since the capacitor 458 is present, the driving device 400J can appropriately execute the dust collection rotation mode under the off mode. The capacity of the capacitor 458 may be designed such that the dust collection rotation mode is executed for several seconds to several tens of seconds.

In this embodiment, ion emission is performed in response to an operation on the switch element 457. Alternatively, if the spindle motor 471 stops for a predetermined time, the above-described dust collection rotation mode may be automatically executed.

<13th Embodiment>
FIG. 38 is a schematic view of a driving device 400K according to the thirteenth embodiment. The drive device 400K will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 10th Embodiment. The description relevant to 10th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

Similarly to the tenth embodiment, the driving device 400K includes an optical disc 420, an optical head 430, a circuit board 453, a housing wall 460, a driving mechanism 470, a dust removing unit 480, an ionizer 490, and a driving circuit 491. . The driving device 400K further includes a charging sensor 459 disposed in the accommodation space 469. In the present embodiment, the charge sensor 459 is exemplified as a detection unit that detects the charge amount of dust floating in the storage space 469 as the charging characteristics in the storage space 469. Alternatively, the detection unit may detect the charge amount of the optical disk or the SIL end surface.

The charging sensor 459 is electrically connected to the circuit board 453. The charging sensor 459 generates a detection signal corresponding to the detected charge amount. The detection signal is output from the charging sensor 459 to the circuit board 453.

The circuit board 453 may control the drive circuit 491 according to the detection signal. For example, the circuit board 453 may control the drive circuit 491 so that positive ions and negative ions are released from the electrode needle 492 only when the charge amount represented by the detection signal exceeds a predetermined threshold value. The circuit board 453 may rotate the optical disc 420 in synchronization with ion emission by controlling the spindle motor 471. As a result, the charge amount of dust in the accommodation space 469 is reduced. In addition, the charge amount of the SIL end surface 534 and the optical disk 420 is also reduced by the ion emission. Since dust adhering to the SIL end surface 534 and the optical disk 420 is reduced, the dust removing unit 480 can efficiently remove dust from the air.

In this embodiment, ions are not released unnecessarily. Accordingly, the ionizer 490 can appropriately release ions over a long period of time.

<Fourteenth embodiment>
FIG. 39 is a schematic diagram of a driving device 400L according to the fourteenth embodiment. The drive device 400L will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 1st Embodiment and 10th Embodiment. The description relevant to 1st Embodiment and 10th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

As in the first embodiment, the driving device 400L includes the magnetic disk 120, the magnetic head 130, and the holding mechanism 140. Similar to the tenth embodiment, a dust removing unit 480, an ionizer 490, and a drive circuit 491 are further provided.

The driving device 400L further includes an accommodation wall 460L. The housing wall 460L includes an upper wall portion 461L that covers the processing surface 121 of the magnetic disk 120, and a lower wall portion 462L that covers the opposite surface 122 of the magnetic disk 120. The upper wall portion 461L and the lower wall portion 462L form an accommodation space 469L that opens toward the holding mechanism 140. The dust removing portion 480 is attached to the upper wall portion 461L.

The swing arm 143, the suspension 142, the slider 141, and the magnetic head 130 are inserted into the open accommodation space 469L. The holding mechanism 140 can rotate the magnetic head 130 and the slider 141 along the processing surface 121 by using an opening region defined by the upper wall portion 461L and the lower wall portion 462L.

The drive device 400L includes a drive mechanism 470L that rotates the magnetic disk 120. Similar to the first embodiment, the drive mechanism 470L includes a spindle motor 171, a hub 175, a cap 176, and a fixing screw 177. Similarly to the tenth embodiment, the drive mechanism 470L includes a fixed wall 474, a shield part 478, and a respiratory filter 479.

The driving device 400L further includes a circuit board 453L. The circuit board 453L controls the drive mechanism 470L and the holding mechanism 140 according to the control method described in relation to the first embodiment. The circuit board 453L controls the drive circuit 491 according to the control method described in relation to the tenth embodiment.

FIG. 40A is a schematic plan view of the driving device 400L. FIG. 40B is a schematic cross-sectional view of drive device 400L. With reference to FIG. 40A and FIG. 40B, the flow of air in the accommodation space 469L will be described.

The arrow AF in FIG. 40A schematically represents the flow of air in the accommodation space 469L. An arrow DR in FIG. 40A schematically represents the rotation of the magnetic disk 120.

Rotating flow is generated in the accommodation space 469L by the rotation of the magnetic disk 120. The swirling flow is directed outward from the rotation axis RX of the magnetic disk 120. If the magnetic disk 120 rotates at several thousand rpm, the speed of the swirling flow reaches several tens of m / s. As a result, the slider 141 and the magnetic head 130 float from the processing surface 121. The holding mechanism 140 may be designed such that the slider 141 and the magnetic head 130 are floated from the processing surface 121 by several nm to several tens of nm by a swirling flow.

As described in relation to the tenth embodiment, positive ions and negative ions are selectively released from the electrode needle 492. As a result, positive ions and negative ions are widely dispersed in the accommodation space 469L. Therefore, the dust in the magnetic disk 120, the magnetic head 130, the slider 141, and the accommodation space 469L is appropriately neutralized. Since the driving device 400L has high reliability, the driving device 400L can maintain the recording performance and the reproduction performance at a high level.

In this embodiment, the driving device 400L performs magnetic recording. The driving device 400L uses the magnetic disk 120 as a medium. Alternatively, the driving device may perform assisted magnetic recording by generating plasmon resonance using a laser beam and a metal antenna.

<Fifteenth embodiment>
FIG. 41A is a schematic cross-sectional view of the drive device 400M of the fifteenth embodiment. FIG. 41B is a schematic plan view of the driving device 400M. The drive device 400M will be described with reference to FIGS. 41A and 41B. In addition, the same code | symbol is attached | subjected with respect to the element same as 3rd Embodiment and 14th Embodiment. The description relevant to 3rd Embodiment and 14th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

As in the fourteenth embodiment, the driving device 400M includes a holding mechanism 140, a circuit board 453L, a housing wall 460L, a driving mechanism 470L, a dust removing unit 480, an ionizer 490, and a driving circuit 491. Similar to the third embodiment, the driving device 400M further includes an optical disc 120B, a semiconductor laser 131 attached to the slider 141, and an optical head 130B.

FIG. 42A is a schematic plan view of the driving device 400M. FIG. 42B is a schematic cross-sectional view of drive device 400M. With reference to FIGS. 42A and 42B, the flow of air in the accommodation space 469L defined by the accommodation wall 460L will be described.

The arrow AF in FIG. 42A schematically represents the flow of air in the accommodation space 469L. An arrow DR in FIG. 42A schematically represents the rotation of the optical disc 120B.

Rotating flow is generated in the accommodation space 469L by the rotation of the optical disc 120B. The swirling flow is directed outward from the rotation axis RX of the optical disc 120B. If the optical disk 120B rotates at several thousand rpm, the speed of the swirling flow reaches several tens of m / s. As a result, the slider 141 and the optical head 130 B float from the processing surface 121. The holding mechanism 140 may be designed such that the slider 141 and the optical head 130B float from the processing surface 121 by several nm to several tens of nm by a swirling flow.

As described in relation to the tenth embodiment, positive ions and negative ions are selectively released from the electrode needle 492. As a result, positive ions and negative ions are widely dispersed in the accommodation space 469L. Accordingly, the dust in the optical disk 120B, the optical head 130B, the slider 141, and the accommodation space 469L is appropriately discharged. Since the driving device 400M has high reliability, the driving device 400M can maintain the recording performance and the reproduction performance at a high level.

<Sixteenth Embodiment>
FIG. 43 is a schematic cross-sectional view of the drive device 400N of the sixteenth embodiment. The drive device 400N will be described with reference to FIG. In addition, the same code | symbol is attached | subjected with respect to the element same as 1st Embodiment and 15th Embodiment. The description relevant to 1st Embodiment and 15th Embodiment is used with respect to the element to which the same code | symbol was attached | subjected.

As in the fifteenth embodiment, the driving device 400N includes an optical disk 120B, an optical head 130B, a semiconductor laser 131, a circuit board 453L, a receiving wall 460L, an ionizer 490, and a driving circuit 491. As in the first embodiment, the driving device 400N further includes a dust removing unit 180. The upper collection filter 181 is attached to the upper wall portion 461. The lower collection filter 182 is attached to the lower wall portion 462.

The driving device 400N further includes an additional optical disc 120N. The optical disc 120N is held between the optical disc 120B and the upper wall portion 461. The optical disc 120N is substantially coaxial with the optical disc 120B. In the present embodiment, one of the

optical disks

120B and 120N is exemplified as the first medium. The other of the

optical disks

120B and 120N is exemplified as the second medium.

The driving device 400N further includes a driving mechanism 470N that drives the

optical disks

120B and 120N. Similar to the fifteenth embodiment, the drive mechanism 470N includes a spindle motor 171, a hub 175, a cap 176, a fixing screw 177, a fixing wall 474, a shield part 478, and a breathing filter 479. The drive mechanism 470N further includes a spacer 571 interposed between the

optical disks

120B and 120N. The fixing screw 177 passes through the cap 176 and the spacer and is screwed into the hub 175. As a result, the

optical disks

120B and 120N can rotate integrally.

The driving device 400N further includes a holding mechanism 140N. Similar to the fifteenth embodiment, the holding mechanism 140N includes a slider 141, a suspension 142, a swing arm 143, and a voice coil motor 144. The holding mechanism 140N further includes an additional slider 141N, an additional suspension 142N, and an additional swing arm 143N. Similar to the slider 141, the suspension 142, and the swing arm 143, the slider 141N, the suspension 142N, and the swing arm 143N are rotated by the voice coil motor 144.

The driving device 400N includes an additional semiconductor laser 131N mounted on the slider 141N and an additional optical head that condenses light from the semiconductor laser 131N on the optical disc 120N and optically executes information processing such as recording and reproduction. 130N. In the present embodiment, one of the

optical heads

130B and 130N is exemplified as the first processing element. The other of the

optical heads

130B and 130N is exemplified as the second processing element.

Also in the present embodiment, the dust in the accommodation space 469L is appropriately reduced by using the swirl flow generated by the rotation of the

optical discs

120B and 120N and the ions generated by the ionizer 490.

The various techniques described in connection with the above-described embodiments mainly include the following features.

The drive device according to one aspect of the above-described embodiment includes a wall portion that defines an accommodation space in which at least one medium having a processing surface on which information processing is performed is accommodated, and a non-contact type with respect to the processing surface. And at least one processing element that performs information processing, and a drive mechanism that rotates the at least one medium. The drive mechanism includes a force generating unit that generates a driving force for rotating the at least one medium, a transmission unit that transmits the driving force to the at least one medium, and the force generating unit on the wall unit. A fixing portion to be fixed. The wall is formed with an opening that allows the transmission portion to pass therethrough. The fixing portion closes the opening in cooperation with the force generating portion.

According to the above configuration, the drive mechanism rotates at least one medium while at least one processing element performs non-contact information processing on the processing surface of at least one medium in a non-contact manner. Since the opening is formed in the wall portion, the driving force generated by the force generating portion fixed by the fixing portion is transmitted to at least one medium through the transmitting portion. The rotation of at least one medium creates a negative pressure around the opening. Since the fixing portion closes the opening by cooperating with the force generating portion, the outside air and dust floating in the outside air are less likely to enter the accommodation space through the opening. Therefore, the amount of dust in the accommodation space is maintained at a low level.

In the above configuration, the wall portion, the fixing portion, and the force generating portion may seal the accommodation space.

According to the above configuration, the wall portion, the fixing portion, and the force generation portion seal the accommodation space, so that the amount of dust in the accommodation space is maintained at a low level.

In the above configuration, the drive device may further include a suspension that supports the at least one processing element, and a rotation motor that rotates the at least one processing element on the processing surface. The suspension and the rotation motor may be disposed in the accommodation space.

According to the above configuration, the suspension space that supports at least one processing element and the rotation motor that rotates the at least one processing element on the processing surface are disposed in the accommodation space, so that the accommodation space is isolated from the outside air. It becomes easy to be done. Therefore, the amount of dust in the accommodation space is maintained at a low level.

In the above configuration, the driving mechanism may rotate the at least one medium to generate a swirling flow in the accommodation space.

According to the above configuration, the drive mechanism rotates at least one medium and generates a swirling flow in the accommodation space, so that dust in the accommodation space is less likely to adhere to the medium and the processing element.

In the above configuration, the driving device includes a first inflow port formed in the wall portion, and a first outflow port formed in the wall portion farther from the rotation axis of the at least one medium than the first inflow port. And a first circulation pipe connected to the first and second circulation pipes. The drive mechanism may rotate the at least one medium to generate an air flow from the first outlet to the first inlet.

According to the above configuration, the air in the accommodation space flows out to the first outlet by the generation of the swirling flow. Thereafter, the air returns to the accommodation space through the first inflow port. Since the retention of air in the accommodation space is reduced, the dust is less likely to adhere to the medium and the processing element.

In the above configuration, the driving device is connected to the second outlet formed in the wall portion and the second inlet formed nearer to the rotation axis of the at least one medium than the second outlet. The second circulation pipe may be further provided. The drive mechanism may rotate the at least one medium to generate an air flow from the second outlet to the second inlet.

According to the above configuration, due to the generation of the swirling flow, the air in the accommodation space flows out from the second outlet as well as the first outlet. Thereafter, the air returns to the accommodation space not only through the first inlet but also through the second inlet. Since the retention of air in the accommodation space is reduced, the dust is less likely to adhere to the medium and the processing element.

In the above configuration, the drive device may further include a collection filter that collects dust in the accommodation space.

According to the above configuration, the dust in the accommodation space is collected by the collection filter, so that the dust floating in the accommodation space is reduced.

In the above configuration, the driving device may further include an ion emission unit that emits positive ions and negative ions in the accommodation space.

According to the above configuration, since the ion emission part emits positive ions and negative ions to the accommodation space, the dust is less likely to adhere to the medium or the processing element.

In the above configuration, the driving device may further include a light source that generates a light beam used for the information processing. The at least one processing element may include an optical processing element that emits the light flux to the processing surface and optically performs the information processing.

According to the above configuration, since the amount of dust in the accommodation space is maintained at a low level, optical information processing on the medium is appropriately performed.

In the above configuration, the optical processing element may include a condensing element that condenses the light flux on the processing surface as near-field light.

According to the above configuration, since the amount of dust in the accommodation space is maintained at a low level, optical information processing on the medium is appropriately performed using near-field light.

In the above configuration, the optical processing element may include a plasmon resonance antenna that collects the light flux as plasmon resonance light on the processing surface.

According to the above configuration, since the amount of dust in the accommodation space is maintained at a low level, optical information processing on the medium is appropriately performed using plasmon resonance light.

In the above configuration, the at least one processing element may include a magnetic processing element that performs the information processing using magnetism.

According to the above configuration, since the amount of dust in the accommodation space is maintained at a low level, magnetic information processing on the medium is appropriately performed.

In the above configuration, the at least one processing element may perform a recording process for recording information on the processing surface as the information processing.

According to the above configuration, the amount of dust in the accommodation space is maintained at a low level, so information is appropriately recorded on the medium.

In the above configuration, the at least one processing element may perform a reproduction process for reproducing information from the processing surface as the information processing.

According to the above configuration, the amount of dust in the accommodation space is maintained at a low level, so that information is appropriately reproduced from the medium.

The said structure WHEREIN: The said wall part contains the 1st wall member which prescribes | regulates a part of said accommodation space, and the 2nd wall member which cooperates with this 1st wall member and defines the said accommodation space. Good.

According to the above configuration, the wall portion forming the accommodation space can be easily assembled.

In the above configuration, the fixing portion may include a support portion that supports the force generation portion, and a shield portion that surrounds the transmission portion between the support portion and the wall portion. The shield part may keep an airtight space between the support part and the wall part.

According to the above configuration, the shield portion keeps the space between the support portion and the wall portion airtight, so that the outside air and dust floating in the outside air enter the accommodation space from the gap between the support portion and the wall portion. It becomes difficult. Therefore, the amount of dust in the accommodation space is maintained at a low level.

In the above configuration, the shield part may include at least one material selected from the group consisting of resin, rubber, and silicon.

According to the above configuration, since the shield part includes at least one material selected from the group consisting of resin, rubber, and silicon, the outside air and the dust that floats in the outside air are separated from the gap between the support part and the wall part. It becomes difficult to enter the storage space. Therefore, the amount of dust in the accommodation space is maintained at a low level.

In the above configuration, the wall portion may include a first inner surface facing the processing surface. The collection filter may include a first filter that protrudes from the first inner surface toward the processing surface.

According to the above configuration, since the first filter protrudes from the first inner surface toward the processing surface, dust is appropriately collected. Therefore, dust floating in the accommodation space is reduced.

In the above configuration, the at least one medium may include an opposite surface opposite to the processing surface. The wall portion may include a second inner surface facing the opposite surface. The collection filter may include a second filter that protrudes from the second inner surface toward the opposite surface.

According to the above configuration, since the second filter protrudes from the second inner surface toward the opposite surface, dust is appropriately collected. Therefore, dust floating in the accommodation space is reduced.

In the above configuration, the transmission unit includes a hub to which the at least one medium is fixed, a cap that holds the at least one medium in cooperation with the hub, and penetrates the cap and is connected to the hub. And a fixing screw.

According to the above configuration, the medium can be rotated with high accuracy.

In the above configuration, the wall portion may include a respiratory filter. The breathing filter may reduce a pressure difference between the housing space and an external space partitioned from the housing space by the wall portion.

According to the above configuration, since the pressure difference between the accommodation space and the external space is small, the wall portion is not easily deformed.

In the above configuration, the driving device may further include a holding portion that holds the suspension in the accommodation space. The rotation motor includes the at least one processing element between a processing position where the at least one processing element performs the information processing on the processing surface and a retreat position where the at least one processing element is separated from the processing surface. The element may be rotated. The holding unit may hold the suspension obtained by rotating the at least one processing element at the retracted position.

According to the above configuration, since the holding unit holds the suspension in the accommodation space, dust generated due to friction between the suspension and the holding unit is appropriately collected by the collection filter.

In the above configuration, a distance between the wall portion and the at least one medium may be 20 μm or more and 5 mm or less.

According to the above configuration, since the distance between the wall portion and at least one medium is 20 μm or more and 5 mm or less, the swirling flow is appropriately generated in the accommodation space.

In the above configuration, the at least one medium may include an inner edge region sandwiched between the hub and the cap and an outer edge region surrounding the inner edge region. A distance between the inner edge region and the first inner surface may be longer than a distance between the outer edge region and the first inner surface.

According to the above configuration, the swirl flow is stably generated in the accommodation space.

In the above configuration, the distance between the inner edge region and the second inner surface may be longer than the distance between the outer edge region and the second inner surface.

In the above configuration, the wall portion may include an inner peripheral surface that defines the accommodation space between the first inner surface and the second inner surface. The at least one medium may include an outer peripheral surface facing the inner peripheral surface between the processing surface and the opposite surface. The distance between the inner peripheral surface and the outer peripheral surface may be 10 μm or more and 5 mm or less.

In the above configuration, the driving device may further include activated carbon that absorbs organic gas in the accommodation space.

According to the above configuration, the organic gas in the accommodation space is reduced.

In the above configuration, the driving device may further include a desiccant that absorbs moisture in the accommodation space.

According to the above configuration, moisture in the accommodation space is reduced.

In the above configuration, the driving device may further include a control unit that controls the driving mechanism. The control unit includes a processing rotation mode in which the processing element rotates the at least one medium in order to perform the information processing on the at least one medium, and at least the dust in the collection filter to collect the dust. You may switch control with respect to the said drive mechanism between the dust collection rotation modes which rotate one medium and generate the said turning flow in the said accommodation space.

According to the above configuration, since the control unit switches the control of the drive mechanism between the processing rotation mode and the dust collection rotation mode, information processing on the medium and cleaning of the accommodation space are appropriately performed.

In the above configuration, the driving device is between an on mode that enables power supply from the power source to the driving mechanism and the processing element and an off mode that blocks power supply from the power source to the driving mechanism and the processing element. A power switch unit for switching the power supply mode may be further provided. In a period from when the power switch unit sets the power supply mode to the on mode until the at least one processing element starts the information processing, the control unit controls the drive mechanism under the dust collection rotation mode. You may control.

According to the above configuration, after the power switch unit sets the power supply mode to the on mode, the accommodation space is appropriately cleaned.

In the above configuration, the drive device may further include a power storage unit that performs power storage in a power supply path between the power source and the drive mechanism. After the power switch unit sets the power supply mode to the off mode, the drive mechanism receives power stored in the power storage unit and rotates the at least one medium in the dust collection rotation mode. Good.

According to the above configuration, after the power switch unit sets the power supply mode to the off mode, the accommodation space is appropriately cleaned.

In the above-described configuration, the control unit may emit the positive ions and the negative ions from the ion emission unit to the accommodation space under the dust collection rotation mode.

According to the above configuration, the ion emission unit emits positive ions and negative ions into the accommodation space under the dust collection rotation mode, so that the dust is appropriately collected by the collection filter.

In the above configuration, after the power supply mode is switched from the off mode to the on mode, the control unit may control the drive mechanism and the ion emission unit under the dust collection rotation mode.

According to the above configuration, the storage space is appropriately cleaned after the power supply mode is switched from the off mode to the on mode.

In the above configuration, after the power supply mode is switched from the on mode to the off mode, the control unit may control the drive mechanism and the ion emission unit under the dust collection rotation mode.

According to the above configuration, the storage space is appropriately cleaned after the power supply mode is switched from the on mode to the off mode.

In the above configuration, if the drive mechanism is stopped for a predetermined period, the ion emission unit may emit the positive ions and the negative ions into the accommodation space.

According to the above configuration, if the drive mechanism is stopped for a predetermined period, the accommodation space is appropriately cleaned.

In the above configuration, after the at least one processing element stops the information processing, the ion emission unit may emit the positive ions and the negative ions into the accommodation space.

According to the above configuration, after at least one processing element stops information processing, the accommodation space is appropriately cleaned.

In the above configuration, the control unit may vary the rotation speed of the at least one medium under the dust collection rotation mode.

According to the above configuration, the control unit varies the rotation speed of at least one medium under the dust collection rotation mode, so that the accommodation space is appropriately cleaned.

In the above configuration, the ion emission unit may release the positive ions and the negative ions into the accommodation space using the electric power stored in the power storage unit.

According to the above configuration, the ion emission unit uses the electric power stored in the power storage unit to release positive ions and negative ions into the accommodation space. To be cleaned.

In the above configuration, the driving device may further include a detection unit that detects a charging characteristic in the accommodation space. The ion emission unit may emit the positive ions and the negative ions into the accommodation space according to the charging characteristics.

According to the above configuration, since the ion emission unit releases positive ions and negative ions into the accommodation space according to the charging characteristics detected by the detection unit, the accommodation space is cleaned in a timely manner. Further, positive ions and negative ions are not unnecessarily released into the accommodation space.

In the above configuration, the at least one medium may include a first medium and a second medium. The at least one processing element may include a first processing element that performs the information processing on the first medium and a second processing element that performs the information processing on the second medium.

According to the above configuration, appropriate information processing is executed for the first medium and the second medium.

In the above-described configuration, the ion emission unit may include at least one electrode needle that emits the positive ions and the negative ions to the accommodation space, and an application unit that applies a voltage to the electrode needle.

According to the above configuration, the accommodating space is appropriately cleaned using positive ions and negative ions emitted from at least one electrode needle.

In the above configuration, the ion emission part may selectively release the positive ions and the negative ions.

According to the above configuration, the accommodation space is appropriately cleaned using positive ions and negative ions that are selectively released.

In the above configuration, the at least one electrode needle may include a plus electrode needle that emits the plus ions and a minus electrode needle that emits the minus ions.

According to the above configuration, the accommodation space is appropriately cleaned using positive ions released from the positive electrode needle and negative ions released from the negative electrode needle.

In the above configuration, the ion emission unit may alternately perform the release of the plus ions from the plus electrode needle and the emission of the minus ions from the minus electrode needle.

According to the above configuration, the accommodation space is appropriately cleaned by using positive ions and negative ions released alternately.

In the above configuration, the ion emission unit may generate the positive ions and the negative ions using corona discharge.

According to the above configuration, the accommodation space is appropriately cleaned using positive ions and negative ions emitted using corona discharge.

In the above configuration, the ion emission unit may generate the positive ions and the negative ions using ionizing radiation.

According to the above configuration, the accommodation space is appropriately cleaned using positive ions and negative ions emitted using ionizing radiation.

In the above configuration, the ion emission unit may generate the positive ions and the negative ions using soft X-rays.

According to the above configuration, the accommodation space is appropriately cleaned using positive ions and negative ions emitted using soft X-rays.

In the above configuration, the ion emission unit may generate the positive ions and the negative ions using α rays.

According to the above configuration, the accommodation space is appropriately cleaned using positive ions and negative ions emitted using α rays.

In the above configuration, the ion emission unit may generate the positive ions and the negative ions using ultraviolet rays.

According to the above configuration, the accommodation space is appropriately cleaned using positive ions and negative ions released using ultraviolet rays.

In the above configuration, the collection filter may be a non-electric filter.

According to the above configuration, the collection filter is hardly deteriorated even in the presence of positive ions and negative ions.

In the above configuration, the collection filter may be made of resin.

In the above configuration, the collection filter may be formed using polypropylene.

In the above configuration, the collection filter may have a lattice-like fiber layer.

According to the above configuration, the collection filter can appropriately collect dust.

In the above configuration, the fiber layer may have a predetermined lattice spacing.

According to the above configuration, the collection filter can collect dust stably.

The principles of the various embodiments described above are applicable to an apparatus that performs information processing in a non-contact manner with respect to a medium. For example, the principles of the various embodiments described above may be applied to an external storage device, a video recording device, and a video playback device that use a large-capacity recording medium. The principles of the various embodiments described above can also be applied to devices such as car navigation systems, portable music players, digital still cameras, and digital video cameras. Particularly preferably, the principles of the various embodiments described above are applied to devices that are susceptible to dust, such as optical disk drive devices and hard disk drive devices. The principles of the various embodiments described above can be suitably applied to the field of optical disk recording / playback apparatuses using the recording / playback principle of the SIL system or plasmon system and the field of hard disk drives using the heat-assisted recording principle.

Claims

A wall that defines a storage space in which at least one medium having a processing surface on which information processing is performed is stored;
At least one processing element that performs the information processing in a non-contact manner with respect to the processing surface;
A drive mechanism for rotating the at least one medium,
The drive mechanism includes a force generating unit that generates a driving force for rotating the at least one medium, a transmission unit that transmits the driving force to the at least one medium, and the force generating unit on the wall unit. A fixing portion for fixing,
The wall is formed with an opening that allows the transmission part to pass therethrough,
The fixing unit closes the opening in cooperation with the force generation unit.
The drive device according to claim 1, wherein the wall portion, the fixing portion, and the force generating portion seal the housing space.
A suspension supporting the at least one processing element;
A rotation motor that rotates the at least one processing element on the processing surface; and
The drive device according to claim 1, wherein the suspension and the rotation motor are disposed in the housing space.
4. The drive device according to claim 3, wherein the drive mechanism rotates the at least one medium to generate a swirl flow in the accommodation space.
A first inflow port formed in the wall and a first outflow port formed in the wall away from the rotation axis of the at least one medium than the first inflow port; A circulation pipe,
The drive device according to claim 4, wherein the drive mechanism rotates the at least one medium to generate an air flow from the first outlet to the first inlet.
A second circulation pipe connected to the second outlet formed in the wall and a second inlet formed closer to the rotation axis of the at least one medium than the second outlet. Prepared,
The drive device according to claim 5, wherein the drive mechanism rotates the at least one medium to generate an air flow from the second outlet to the second inlet.
The drive device according to claim 4, further comprising a collection filter for collecting dust in the accommodation space.
The driving device according to claim 7, further comprising an ion emission unit that emits positive ions and negative ions in the accommodation space.
The wall includes a first inner surface facing the processing surface,
The drive device according to claim 7, wherein the collection filter includes a first filter protruding from the first inner surface toward the processing surface.
The at least one medium includes an opposite surface opposite the treatment surface;
The wall includes a second inner surface facing the opposite surface;
The drive device according to claim 9, wherein the collection filter includes a second filter that protrudes from the second inner surface toward the opposite surface.
The transmission unit includes a hub to which the at least one medium is fixed, a cap that sandwiches the at least one medium in cooperation with the hub, and a fixing screw that passes through the cap and is connected to the hub. The drive device according to claim 10, comprising:
A holding part for holding the suspension in the housing space;
The rotation motor includes the at least one processing element between a processing position where the at least one processing element performs the information processing on the processing surface and a retreat position where the at least one processing element is separated from the processing surface. Rotate the element,
The driving device according to claim 7, wherein the holding unit holds the suspension obtained by rotating the at least one processing element at the retracted position.
The at least one medium includes an inner edge region sandwiched between the hub and the cap, and an outer edge region surrounding the inner edge region;
The driving device according to claim 11, wherein a distance between the inner edge region and the first inner surface is longer than a distance between the outer edge region and the first inner surface.
14. The driving device according to claim 13, wherein a distance between the inner edge region and the second inner surface is longer than a distance between the outer edge region and the second inner surface.
A control unit for controlling the drive mechanism;
The control unit includes a processing rotation mode in which the processing element rotates the at least one medium in order to perform the information processing on the at least one medium, and at least the dust in the collection filter to collect the dust. The drive device according to claim 8, wherein control of the drive mechanism is switched between a dust collection rotation mode in which one medium is rotated and the swirl flow is generated in the accommodation space.
A power switch that switches a power supply mode between an on mode that enables power supply from a power source to the drive mechanism and the processing element and an off mode that blocks power supply from the power source to the drive mechanism and the processing element Further comprising
In a period from when the power switch unit sets the power supply mode to the on mode until the at least one processing element starts the information processing, the control unit controls the drive mechanism under the dust collection rotation mode. The drive device according to claim 15, wherein the drive device is controlled.
A power storage unit that stores power in a power supply path between the power source and the drive mechanism;
After the power switch unit sets the power supply mode to the off mode, the drive mechanism receives the power stored in the power storage unit and rotates the at least one medium under the dust collection rotation mode. The drive device according to claim 16, wherein
The driving device according to claim 17, wherein the control unit releases the positive ions and the negative ions from the ion emission unit to the accommodation space under the dust collection rotation mode.
19. The driving apparatus according to claim 18, wherein the ion emission unit releases the positive ions and the negative ions into the accommodation space if the driving mechanism is stopped for a predetermined period.
19. The driving apparatus according to claim 18, wherein after the at least one processing element stops the information processing, the ion emission unit emits the positive ions and the negative ions into the accommodation space.
19. The driving apparatus according to claim 18, wherein the control unit varies a rotation speed of the at least one medium under the dust collection rotation mode.
A detector for detecting charging characteristics in the housing space;
The driving apparatus according to claim 18, wherein the ion emission unit emits the positive ions and the negative ions into the accommodation space according to the charging characteristics.