JP2000149465A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device capable of stably recording and/or reproducing information without damaging the signal recording surface of an information recording medium even though an impact is exerted and also after the impact was exerted. SOLUTION: This disk device 1 is provided with a supporting means 15 to support an element for recording and/or reproducing the information of a disk-like information recording medium 5. In this case, a 1st distance to the supporting means 15 from the outer peripheral end part 5a of the information recording medium 5 in a direction vertical to the disk surface of the information recording medium 5 is arranged to be shorter than a 2nd distance to the supporting means 15 from the part of the information recording medium 5 other than the outer peripheral end part 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for recording information on a disk-shaped information recording medium and / or reproducing the information recorded on the information recording medium.

[0002]

2. Description of the Related Art In recent years, with the development of the information industry, information such as image information and audio information (hereinafter, video information is taken as an example) is digitized, and recording and reproduction of moving images using a computer are frequently performed. ing. In order to record such digitized information, for example, a magnetic disk device (hereinafter, referred to as a hard disk drive (hard disk)) is used as an external storage device that performs recording / reproduction using a magnetoresistance effect. Thus, hard disk drives are steadily increasing in capacity and density. The magnetic disk has a random access property such that an image to be viewed can be instantly viewed without rewinding or fast-forwarding like a magnetic tape, for example. For this reason, magnetic disks use AV (Audio) such as video instead of magnetic tape.
o-Visual) equipment.

[0003] Today, video information captured by a video camera or the like is easily imported into a computer, and is used in a personal computer (Personal Computer).
r: hereinafter also referred to as a PC), and the barrier between digital data handled on a PC and digital data of video information is disappearing. This is the start of the so-called “PC-AV integration” that integrates various digital data. In order to further promote the “PC-AV integration”, at a price that is easy for anyone to obtain and a large capacity There is a demand for a magnetic disk drive capable of recording data. The key to such a demand is, for example, a plastic hard disk (hereinafter, hard disk having a magnetic disk of a plastic substrate is referred to as such).

[0004] For example, there are two types of plastic hard disks. The first plastic hard disk is a plastic hard disk in which a conventional substrate material is simply replaced with plastic. Unlike a conventional hard disk manufacturing method, this plastic hard disk is manufactured by injecting a resin without a substrate polishing step, and can be manufactured at low cost. In addition, since this plastic hard disk uses a high-precision injection molding method, a good substrate shape can be achieved, and a large-capacity, low-cost hard disk can be realized.

On the other hand, the second plastic hard disk is a plastic hard disk in which information is recorded in advance (hereinafter, referred to as a preformat) at the time of manufacturing a substrate. Preformatting is performed by creating a stamper by using the mastering technique of an optical disk and transferring irregularities corresponding to information signals onto a substrate. By using this technique, accurate servo information can be formed on the disk surface.
There is a possibility that high-precision tracking capable of faithfully tracing a narrow track equal to or larger than PI (Track Per Inch) can be realized. For this reason, plastic hard disks have been receiving attention as next-generation high-density recording media (hereinafter abbreviated as media).

In a conventional magnetic disk, servo information is written on each disk by a magnetic head (this process is called a servo write). On the other hand, as described above, in a plastic hard disk, pre-formatting is performed. Servo information can be easily formed.
For this reason, plastic hard disks have also been found to be demanded as removable hard disk media. Furthermore, taking advantage of the advantage that a pit similar to an optical disk can be formed on a substrate and the advantage that a slider can fly over a substrate with a flying height of 50 nm or less, an external device that incorporates a magneto-optical disk recording / reproducing method into a hard disk device configuration. Storage devices, so-called OAW (Optica)
Also, application to a medium for a drive of an "ally assisted winchester" type is being studied. As described above, by using a plastic hard disk, it is possible to realize an inexpensive information recording medium and a higher density information recording apparatus.

[0007]

However, the above-mentioned plastic hard disk has the following problems. This is because plastic hard disks are softer than conventional magnetic disks with aluminum substrates (hereinafter also referred to as aluminum disks) or magnetic disks with glass substrates (hereinafter also referred to as glass disks). The resistance is weak.

For example, it is assumed that a 3.5-inch-diameter plastic hard disk is loaded in a magnetic disk drive and an impact of, for example, 300 G acceleration is applied in the spindle axis direction of the magnetic disk drive. In the case of a plastic hard disk, 2.0 m at the outer edge of the magnetic disk
A vibration having an amplitude of about m (hereinafter, referred to as a vibration amplitude). On the other hand, in the case of an aluminum disk, the same condition is applied to the condition of 0.1 mm.
The vibration amplitude is about 6 mm. Therefore, the vibration amplitude of the plastic hard disk is larger. Details will be described later.

When the magnetic disk device is not operating, a flying slider equipped with an information recording and / or reproducing element (hereinafter also referred to as a recording / reproducing element) has a contact start / stop (at the innermost circumference of the magnetic disk). Conta
ct Start Stop (hereinafter referred to as CSS)).

Therefore, components such as a suspension and an arm provided between the voice coil motor and the slider sandwich the magnetic disk when not operating so that the flying slider can move anywhere on the inner and outer circumferences of the magnetic disk. It is provided in such a form. Usually, the flying slider on which the information recording / reproducing element is mounted is arranged on both sides of the magnetic disk, and therefore, for example, is arranged between a plurality of magnetic disks.

The distance between the surface of the magnetic disk and the arm facing the magnetic disk surface is determined by a head gimbal assembly (hereinafter referred to as H).
The height is usually the same as the mounting surface height (hereinafter referred to as Z height) of the GA. Therefore, the distance is generally about 0.5 to 0.7 mm.

When the magnetic disk drive is not operating, parts such as an arm and a suspension are left above the disk. At this time, if the magnetic disk device is dropped, for example, an acceleration of about 250 to 300 G is applied to the magnetic disk device as an impact. 250 ~
The impact of about 300 G is, for example, an acceleration when falling on a rubber ball from a height of about 30 cm. Therefore, such a shock may be applied to the magnetic disk device even in a general life scene. When a plastic hard disk is used as the magnetic disk, the vibration amplitude is 2.0 mm as described above, and even when an aluminum disk is used, the vibration amplitude is 0.6 mm.

However, since the gap between the arm and the magnetic disk is generally 0.5 to 0.7 mm as described above, even in the case of an aluminum disk, there is a possibility that the arm and the magnetic disk come into contact with each other in this gap. In the case of a plastic hard disk, the vibration oscillates as much as 2.0 mm, so that the arm and the magnetic disk are clearly in contact with each other. Further, if the contact state is severe, a collision occurs, and the signal recording surface of the magnetic disk may be damaged, so that information may be recorded on the magnetic disk or information on the magnetic disk may not be reproduced.

In the case of contact between the arm and the aluminum disk, only the outer peripheral end of the aluminum disk comes into contact. However, in the case of contact between the arm and the plastic hard disk, the vibration amplitude is large, so that only the outer peripheral end is provided. In addition, there may be a case where a portion from a radius of about 30 mm to an outer peripheral end portion contacts. That is, if the magnetic disk drive is 300
If the contact between the arm and the magnetic disk surface is not avoided when the acceleration of about G is received, the signal recording surface of the magnetic disk will be damaged, and the information stored on the magnetic disk cannot be reproduced.

Impact Test Here, the magnetic disk device will be examined specifically to what extent it is affected when it is subjected to an impact due to a drop or the like. Impact Test Conditions In this impact test, a general impact tester is used. The impact tester used in this test is a drop type that drops the test object. An elastic body such as rubber is placed at the drop point, and the acceleration applied by changing the hardness and shape of the elastic body Can be changed. Further, the impact tester can change the magnitude of the acceleration by changing the drop height. In this embodiment, for example, an acceleration of 100 to 300 G is applied with a half-sine waveform of 2 ms. Confirmation of the presence or absence of a scratch on the surface of the magnetic disk is performed using, for example, a microscope.

As the magnetic disk used this time, a plastic hard disk made of a soft material, which is most effective, is used. The magnetic disk has a diameter of 3.5
Inches and 1.27 mm thick. An underlayer and a magnetic layer protective layer are respectively applied to both disk surfaces of the magnetic disk in order by, for example, a sputtering method. Further, a lubricant is applied to the surface of the magnetic disk by, for example, a dipping method.

When the above-mentioned plastic hard disk is mounted on the hard disk drive 1, the distance from the arm to the magnetic disk in the direction perpendicular to the disk surface between the arm and the magnetic disk other than near the outer peripheral end is, for example, 0.6 mm. The distance from the arm to the magnetic disk near the outer peripheral end of the magnetic disk is, for example, 0.35 mm.

FIGS. 13A and 13B respectively show an arm 115 in a conventional hard disk drive.
FIG. 2 is a partially enlarged view showing a configuration example of a magnetic disk 5.
FIG. 13A shows a state where the magnetic disk 5 vibrates and deforms when an impact is applied to the conventional hard disk drive, and starts to contact the arm 115.
13B shows a state where the magnetic disk 5 is further deformed after a very short time has elapsed from the state shown in FIG.

[0019] Impact Test Results FIG 14 is a diagram showing the impact test results of conventional hard disk drives. The terms and symbols in FIG. 14 have the following meanings, respectively. The “up plane” indicates the surface of the magnetic disk 5. "Down
The “surface” indicates the back surface of the magnetic disk 5. “○”: Scratched “X”: No scratch “?”: Difficult to confirm the presence of a scratch The radius in FIG. 14 is the position on the disk surface in the radial direction from the center of the magnetic disk 5 (in the radial direction from the center). (Positions on the signal recording surface such as 35 mm, 41 mm, and 44 mm).

In the conventional hard disk drive, when the impact is small (about 100 G), the magnetic disk 5 has no scratch. However, when the impact is large (about 200 G), not only the outer peripheral end 5a but also a radius of about 40 mm ( A number of scratches were also observed on the position including the signal recording surface). this is,
This is because, in the case of a conventional hard disk drive, the outer peripheral end 5a of the magnetic disk 5 first contacts the arm 115 due to the acceleration of the applied impact, and then the contact area expands toward the inner peripheral. Therefore, it can be seen that the conventional hard disk drive is vulnerable to impact. The conventional hard disk drive cannot record and / or reproduce information because the signal recording surface of the magnetic disk 5 is damaged.

Accordingly, the present invention solves the above-mentioned problems, and can stably record and / or reproduce information even after an impact is applied without damaging a signal recording surface of an information recording medium even when an impact is applied. It is intended to provide a disk device.

[0022]

SUMMARY OF THE INVENTION The object of the present invention is to record and / or record information on a disc-shaped information recording medium.
Or a disk device provided with support means for supporting an element for reproduction, wherein a first distance from an outer peripheral end of the information recording medium to the support means in a direction perpendicular to a disk surface of the information recording medium is the outer periphery. This is achieved by a disk device characterized by being shorter than a second distance from the information recording medium other than the end to the support means.

According to the above arrangement, the first distance from the outer peripheral end of the information recording medium to the supporting means in the direction perpendicular to the disk surface of the information recording medium is equal to the distance from the information recording medium other than the outer peripheral end. It is shorter than the second distance to the support means. The information recording medium that vibrates when a shock is applied to the disk device has its outer peripheral end abutted on supporting means near the outer peripheral end to suppress vibration. Since the signal recording surface is not provided at the outer peripheral end of the information recording medium, the signal recording surface of the information recording medium is not damaged even if the outer peripheral end contacts the support means. Therefore, even when a shock is applied to the disk device, the signal recording surface of the magnetic disk is not damaged. Therefore, the disk device can stably record and / or reproduce information even after receiving an impact.

[0024]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

First Embodiment FIG. 1 is a perspective view schematically showing an example of the internal structure of a hard disk drive as a first embodiment of the present invention. FIG.
FIG. 2 is an exploded perspective view showing an example of the internal structure of the embodiment of the magnetic head device in FIG. 1. This hard disk drive 1
In the chassis 2 of the (disk device, magnetic disk device), a spindle motor 3, a rotary actuator 11 of a magnetic head device 10, and a magnetic disk 5 sandwiched by a clamper 4 on the axis of the spindle motor 3 are arranged. Have been.

The rotary actuator 11 of the magnetic head device 10 is provided with a coil 13 and a magnet 14 for rotating the actuator on one side with a rotating shaft 12 interposed therebetween, and defines the actuator length on the other side. An arm 15 for setting the length is provided. A detailed configuration example of the arm 15 will be described later. A suspension 16 is attached to an open end of the arm 15. At the open end of the suspension 16, a head slider 17 to which a magnetic head (an element for recording and / or reproducing information on the magnetic disk 5) is mounted is attached.

An operation example of such a configuration will be described. The spindle motor 3 is driven to rotate the magnetic disk 5 (disk-shaped information recording medium) in the direction indicated by the arrow R1. Then, the head slider 17 flies over the surface of the magnetic disk 5 at minute intervals due to a steady airflow generated on the surface of the magnetic disk 5 rotating at high speed. Then, the rotary actuator 11 is driven to position the magnetic head at an arbitrary track on the magnetic disk 5. That is, an electromagnetic force is generated between the coil 13 and the magnet 14, and the coil 13 is rotated in the direction indicated by arrow R2, and the integrated arm 15, suspension 16 and head slider 17 are also moved in the direction indicated by arrow R3. Rotate to. Then, a signal is read by a magnetic head positioned at an arbitrary track on the magnetic disk 5.

FIG. 3 shows the hard disk drive 1 of FIG.
FIG. 6 is a plan view showing an example of a stop position of the arm 15 in FIG. FIG. 4 is an enlarged view showing a configuration example of the arm 15 of FIG. 3, and FIG. 5 is a side view schematically showing the arm 15 of FIG. 4 when viewed from the V direction. FIG. 5 shows the outline, and details of the portion W will be described later.

When recording information on the magnetic disk 5 or reproducing information from the magnetic disk 5, the hard disk drive 1 uses the head slider 17 as described above.
Floats on the surface of the magnetic disk 5 (the signal recording surface of the magnetic disk), and the arm 15 rotates in the R4 direction to dispose the head slider 17 of FIG. 2 at a predetermined position.
In this hard disk drive 1, a magnetic disk 5
On the other hand, the stop position of the arm 15 when information is not recorded and / or reproduced is, for example, near the clamper 4 near the center 5d of the magnetic disk 5 as shown in FIG. 3 (hereinafter referred to as position A in FIG. 3). is there.

Impact Test Hereinafter, the features of the configuration example of the hard disk drive 1 as the first embodiment of the present invention and the impact test thereof will be described.

Impact Test Conditions The following impact tests are performed under the same conditions as those used in the impact test of the conventional hard disk drive. In this impact test, a general impact tester is used. The impact tester used in this test is a drop type that drops the test object. An elastic body such as rubber is placed at the drop point, and the acceleration applied by changing the hardness and shape of the elastic body Can be changed. Further, the impact tester can change the magnitude of the acceleration by changing the drop height. In this embodiment, for example, an acceleration of 100 to 300 G is applied with a half-sine waveform of 2 ms. The presence or absence of a flaw on the surface of the magnetic disk 5 is confirmed using, for example, a microscope.

As the magnetic disk 5 used this time, a plastic hard disk made of a soft material, which is most effective, is used. The magnetic disk 5 has a diameter of 3.5 inches and a thickness of 1.27 mm. An underlayer and a magnetic layer protective layer are respectively applied to both disk surfaces of the magnetic disk 5 in order by, for example, a sputtering method. Further, a lubricant is applied to the surface of the magnetic disk 5 by, for example, a dipping method.

FIGS. 6, 8 and 10 (A) and (B) referred to in the first embodiment and other embodiments are magnetic disks 5 having a time difference as described above.
Is assumed to be in a deformed state.

FIGS. 6A and 6B are partial enlarged views each showing a configuration example of the portion W of the hard disk drive 1 of FIG. As shown in FIG. 6 (A), the arm 15 is positioned adjacent to the arm 1 at the arm root 15a.
5 is smaller than the distance W2 between the arms 15 at other positions of the arm 15. In other words, as shown in FIG. 6A, the arm 15 is provided with a convex portion at the arm root portion 15 a so as to have a thickness in the direction of the adjacent arm 15, so that the magnetic disk 5 has a magnetic field perpendicular to the disk surface. Distance from the outer peripheral end 5a of the disk 5 to the arm 15 (from the magnetic disk 5 to the arm root 15
a (the first distance) is shorter than the distance (the second distance) from the magnetic disk 5 other than the outer peripheral end 5a to the support means.

The shape of the arm 15 is, for example, as follows. The distance W2 between the arms 15, 15 other than the arm roots 15a, 15a (in the vicinity of the portion W in FIG. 5) is, for example, 2.47 mm, and the arms 15, 15 of the arm root 15a.
The distance W1 between them is, for example, 1.97 mm, and the overlap OL1 (hereinafter simply referred to as overlap) between the arm 15 and the magnetic disk 5 in the X direction is, for example, 2.0 mm. The thickness of the magnetic disk 5 is 1.27 mm.
This is because if the outer edge 5a of the magnetic disk 5 and the arm 15 are in contact with each other about 2.0 mm from the outer circumference of the magnetic disk 5, no information is recorded on the disk surface of the magnetic disk 5. This is because there is no loss of information due to the contact between the arm 15 and the magnetic disk 5.

Impact Test Results The terms and symbols in FIG. 7 have the following meanings, respectively. The meanings of the following terms and symbols are defined in the following second and third embodiments (FIGS. 9, 11 and 1).
The same applies to 2).

The “up surface” indicates the surface of the magnetic disk 5. The “down surface” indicates the back surface of the magnetic disk 5. "○": Scratched "x": No scratch "?": Difficult to confirm the presence of scratch Also, the radius in FIG. 7 refers to the position on the disk surface in the radial direction from the center 5d of the magnetic disk 5 in FIG. 5d, positions on the signal recording surface such as 35 mm, 41 mm, 44 mm, etc. in the radial direction).

FIG. 7 is a diagram showing the results of an impact test of the hard disk drive 1 on which the arm 15 having the configuration shown in FIG. 6A is mounted. In the hard disk drive 1, scratches caused by contact with the arm 15 were observed only at the outer peripheral end 5a. It can be seen that the hard disk drive 1 has extremely few scratches as compared with the conventional hard disk drive. It should be particularly noted that there is no scratch on the signal recording surface of the magnetic disk 5. Therefore, the hard disk drive 1 is more resistant to impact than the conventional hard disk drive.

In the hard disk drive 1, the arm 15 and the magnetic disk 5 near the outer peripheral end 5a of the magnetic disk 5 in the direction perpendicular to the disk surface of the magnetic disk 5
(First distance) is smaller than the distance (second distance) from the magnetic disk 5 to the arm 15 other than the outer peripheral end 5a. When the outer peripheral end 5a of the magnetic disk 5 vibrates and comes into contact with the arm 15, it stops at a predetermined position, and the vibration amplitude of the magnetic disk 5 is suppressed. Therefore, portions other than the outer peripheral end portion 5a of the magnetic disk 5 are prevented from contacting the arm 15. Therefore, the hard disk drive 1 can exhibit good characteristics even if information is recorded after the impact test or information on the magnetic disk 5 is reproduced.

According to the first embodiment of the present invention, even when an impact is applied due to, for example, dropping, the signal recording surface of the magnetic disk is prevented from being damaged irrespective of the material of the magnetic disk by a simple configuration. Thus, it is possible to provide a disk device capable of stably recording and / or reproducing information even after an impact is applied.

Second Embodiment FIG. 8 is a partially enlarged view showing a configuration example of a portion W of FIG. 5 of a hard disk drive 1a as a second embodiment of the present invention. In the second embodiment, portions denoted by the same reference numerals in FIGS. 1 to 5 as those in the first embodiment have the same configuration, and therefore only different points will be described.

In the hard disk drive 1a, FIG.
As shown in (A), elastic vibration suppressing members 20 are embedded in inner surfaces 15b, 15b of the arms 15, 15 facing each other near the outer peripheral end 5a of the magnetic disk 5, respectively. The vibration suppressing member 20 forms, for example, the same plane as the inner surface 15b. The vibration suppressing member 20 is made of, for example, a viscoelastic body having a thickness of 125 μm and a PET (Poly
(Ethylene Terephthalate) film composed of two layers is employed. The vibration suppressing member 20 may be made of an elastic material such as rubber, POM, or Teflon, or a resin made of PET, PEN, polyimide, or the like.

In the hard disk drive 1a, the distance W2 between the arms 15 and 15 (similarly between the vibration suppression members 20) is, for example, 2.
It is fixed at 47 mm. The overlap between the vibration suppressing member 20 and the magnetic disk 5 in the X direction is, for example, 2.0 mm for substantially the same reason as in the first embodiment.

The impact test hard disk drive 1a is configured as described above. Next, the effect when an impact is applied to the hard disk drive 1a is tested. The impact test is performed under the same conditions as in the first embodiment.

Impact Test Results FIG. 9 is a diagram showing the impact test results of a hard disk drive equipped with the arm 15 configured as shown in FIG. 8A. In the hard disk drive 1a, no scratch is recognized on the front surface of the disk surface of the magnetic disk 5 with an impact of acceleration of 250 G or less. It can be seen that the hard disk drive 1a has extremely few scratches as compared with the conventional hard disk drive. In the hard disk drive 1a, the impact is further increased, and even if the acceleration is 300G, scars are scarcely recognized except for a radius of 44 mm on the UP surface.

Even when the hard disk drive 1a receives an impact in this manner, the disk surface is scarcely damaged for the following reasons. When an impact is applied to the hard disk drive 1a, the outer peripheral end 5a of the magnetic disk 5 comes into contact with the arm 15, but the vibration energy of the magnetic disk 5 is absorbed by the vibration suppressing member 20 provided at the contact portion. The deformation of the suppressing member 20 and the heat energy of the vibration suppressing member 20 are converted.
For this reason, in the hard disk drive 1a, the vibration amplitude of the magnetic disk 5 is reduced, and the expansion of the contact area to the center of the magnetic disk 5 can be suppressed. Also,
Since the contact portion is provided with elasticity, the magnetic disk 5
Is not easily scratched during contact.

The above-mentioned hard disk drive 1a was able to exhibit good recording / reproducing characteristics even after recording and / or reproducing information on the magnetic disk 5 after the impact test.

According to the second embodiment of the present invention, the effects of the first embodiment can be exhibited, and in addition, the first
In the embodiment, a material that is not an elastic body is used for the contact portion of the magnetic disk 5, whereas in the second embodiment, a material that is an elastic material is used for the contact portion of the magnetic disk 5.
0 is adopted. In the second embodiment, since the vibration suppressing member 20 is an elastic body, when the magnetic disk 5 collides with the member, the vibration energy is absorbed by the elastic body. Therefore, the vibration of the magnetic disk 5 is rapidly stopped (that is, the rebound coefficient is small). Further, the vibration suppressing member 20 is an elastic body, and is generally a magnetic disk 5.
Softer than. Therefore, the hard disk drive 1
As for a, when the magnetic disk 5 abuts on the vibration suppressing member 20, the magnetic disk 5 is hardly damaged.

Third Embodiment FIG. 10 is a partially enlarged view showing a configuration example of a portion W of FIG. 5 of a hard disk drive 1b as a third embodiment of the present invention. In the third embodiment, the first embodiment shown in FIGS.
Since the portions denoted by the same reference numerals as those of the embodiment and the second embodiment have the same configuration, only different points will be described.

The third embodiment is a form in which the first embodiment and the second embodiment are mixed. In the hard disk drive 1b, as shown in FIG. 10A, the arms 15, 1 facing each other near the outer peripheral end 5a of the magnetic disk 5.
Vibration suppression member 2 having elasticity on inner surfaces 15b, 15b of 5
1 are provided. The vibration suppressing member 21 according to the third embodiment is different from the second embodiment in that the inner peripheral surface 15 b
Unlike the case where the vibration suppressing member 21 is provided so as to be flush with one another, the vibration suppressing member 21 is provided so as to narrow the gap between the inner peripheral surfaces 15b and 15b of the arms 15 facing each other as shown in FIG. ing. The inner surface 15b is a portion where the outer peripheral end 5a of the magnetic disk 5 comes into contact with the arms 15, 15 when an impact is applied to the hard disk drive 1b. In the hard disk drive 1b, the distance (first distance) from the outer peripheral end 5a of the magnetic disk 5 to the vibration suppressing member 21 in the direction perpendicular to the disk surface of the magnetic disk 5 is determined by the vibration from the magnetic disks 5 other than the outer peripheral end 5a. It is shorter than the distance to the suppression member 21 (second distance). The material of the vibration suppressing member 21 is the vibration suppressing member 2 of the second embodiment.
Same as 0.

Further, in the hard disk drive 1b of the third embodiment, the vibration suppressing members 21
The distance W3 between them is, for example, 1.97 mm, and the distance W between the arms 15 without the vibration suppressing member 21 is provided.
2 is 2.47 mm as in the first embodiment. The overlap is the same as in the second embodiment.

The impact test hard disk drive 1b is configured as described above. Next, the effect when an impact is applied to the hard disk drive 1b is tested. The impact test is performed under the same conditions as in the first embodiment.

Impact Test Results FIG. 11 is a diagram showing the results of an impact test of a hard disk drive equipped with the arm 15 configured as shown in FIG. The hard disk drive 1b has no scratches on the entire disk surface of the magnetic disk 5, and no scratches are found on the outer peripheral end portion 5a found in the first and second embodiments. It can be seen that the hard disk drive 1b has extremely few scratches as compared with the conventional hard disk drive. The hard disk drive 1b is hardly damaged even when the acceleration is further increased to about 300G and the impact is increased.

As described above, even when the hard disk drive 1b receives an impact, the disk surface is scarcely damaged.
This is for the same reason as in the first and second embodiments.

The above hard disk drive 1b was able to exhibit good recording / reproducing characteristics even after recording and / or reproducing information on the magnetic disk 5 after the impact test.

According to the third embodiment of the present invention, the synergistic effects of the first and second embodiments can be exhibited.

Additional Impact Test FIG. 12 is a view showing test results when the impact of the impact test is further increased in the first to third embodiments. In FIGS. 7, 9 and 11, for example, 10
Although a shock of 0 G to 300 G is applied to the hard disk drive (hereinafter referred to as a 300 G test), FIG.
For example, a shock with an acceleration of 500 G is applied to the hard disk drive (hereinafter, referred to as a 500 G test).

Referring to FIG. 12, in the first and second embodiments, almost no damage was observed on the disk surface other than the outer peripheral end portion 5a of the magnetic disk 5 in the 300G test, but the radius was reduced in the 500G test. Scratches were found around 40 mm. In the third embodiment, no scratch is seen on the disk surface other than the outer peripheral end portion 5a even in the 500G test. Therefore, it can be seen that the third embodiment is less likely to be damaged than the first and second embodiments and has the greatest effect.
This is because the third embodiment combines the first embodiment and the second embodiment, and the effects of both embodiments appear synergistically.

The above-mentioned hard disk drive 1b further records and / or records information on the magnetic disk 5 after the additional impact test.
Alternatively, even when reproduction was performed, good recording / reproduction characteristics could be exhibited.

The present invention is not limited to the above embodiment. The material of the substrate of the magnetic disk 5 is
The same effect can be exerted not only on the above-mentioned plastic but also on a magnetic disk using aluminum made of another material which is vulnerable to impact or aluminum. The present invention can be applied not only to a magnetic disk device but also to an optical disk device and other information recording and / or reproducing devices. The information recording and / or reproducing apparatus mounted with a plastic hard disk which is said to be vulnerable to the above-described impact is particularly effective.

[0061]

As described above, according to the present invention,
It is possible to provide a disk device capable of stably recording and / or reproducing information even after an impact is applied, without damaging a signal recording surface of an information recording medium even when an impact is applied.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an example of an internal structure of a hard disk drive as a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an example of the internal structure of the embodiment of the magnetic head device of FIG. 1;

FIG. 3 is an exemplary plan view showing an example of a stop position of an arm in the hard disk drive of FIG. 1;

FIG. 4 is an enlarged view showing a configuration example of the arm in FIG. 3;

FIG. 5 is a side view schematically showing the arm of FIG. 4 when viewed from a V direction.

FIG. 6 is a partially enlarged view showing a configuration example of a part W of the hard disk drive in FIG. 5;

FIG. 7 is a diagram showing a shock test result of a hard disk drive on which an arm having a configuration as shown in FIG. 6A is mounted.

FIG. 8 is a partially enlarged view showing a configuration example of a portion W in FIG. 5 of the hard disk drive as a second embodiment of the present invention.

FIG. 9 is a view showing the results of an impact test of a hard disk drive on which an arm having a configuration as shown in FIG. 8A is mounted.

FIG. 10 is a partially enlarged view showing a configuration example of a portion W in FIG. 5 of the hard disk drive as a third embodiment of the present invention.

FIG. 11 is a diagram showing a shock test result of a hard disk drive equipped with an arm having a configuration as shown in FIG.

FIG. 12 is a diagram showing test results when the impact of the impact test is further increased in the first to third embodiments.

FIG. 13 is a partially enlarged view showing a configuration example of an arm and a magnetic disk in a conventional hard disk drive.

FIG. 14 is a diagram showing the results of an impact test on a conventional hard disk drive.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hard disk drive (disk device, magnetic disk device), 5 ... Magnetic disk (disk-shaped information recording medium), 5a ... outer peripheral end, 15 ... arm (support means), 17 ... ..Head sliders, 20 ..
.Vibration suppression member, 21 ... Vibration suppression member

Claims (6)

[Claims] 1. A disk device comprising a support means for supporting an element for recording and / or reproducing information on a disk-shaped information recording medium, wherein the information recording medium is perpendicular to a disk surface of the information recording medium. A first distance from the outer peripheral end to the support means is shorter than a second distance from the information recording medium other than the outer peripheral end to the support means. 2. The disk device according to claim 1, wherein the state in which the first distance is shorter than the second distance is when the support means is located at a standby position. 3. A disk device comprising a support means for supporting an element for recording and / or reproducing information on and from a disk-shaped information recording medium, wherein said support means is adapted to receive said shock when an impact is applied. A disk device, characterized in that a vibration suppressing member having elasticity is provided at a portion where an outer peripheral end of an information recording medium contacts the supporting means. 4. The disk device according to claim 3, wherein the location of the vibration suppressing member is a contact portion of the outer peripheral end when the support means is located at a standby position. 5. A disk device comprising a support means for supporting an element for recording and / or reproducing information on a disk-shaped information recording medium, wherein said support means is adapted to receive said shock when an impact is applied. A vibration suppressing member having elasticity is provided at a portion where the outer peripheral end of the information recording medium contacts the supporting means, and the vibration is generated from the outer peripheral end of the information recording medium in a direction perpendicular to the disk surface of the information recording medium. The first to the suppression member
The distance is shorter than a second distance from the information recording medium other than the outer peripheral end to the vibration suppressing member. 6. The disk device according to claim 5, wherein the arrangement position of the vibration suppressing member is a contact portion of the outer peripheral end when the support means is arranged at a standby position.