JP2868836B2 - Drive device for optical memory - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device in an optical memory device that records and / or reproduces information using a light beam.

[Conventional technology]

As an optical memory device, for example, JP-A-64-43888 discloses that a vent is provided on the front surface of a drive device having a cassette case insertion port, and the cassette case is inserted from the insertion port by a cooling fan when the cassette case is mounted on the drive device. There has been proposed an apparatus in which an air flow reaching a vent through a back surface is generated to prevent a temperature rise in the apparatus.

[Problems to be solved by the invention]

However, in the above-described conventional drive device, since the rear surface of the cassette case is a part of the ventilation path, dust that has entered from the outside adheres to the disk in the cassette case and various optical components constituting the optical head. As a result, there is a problem in that a decrease in the amount of light or the like occurs and information cannot be recorded / reproduced accurately and stably.

As a method for solving such a problem, it is conceivable to arrange a high-performance filter having a high collecting ability in a vent for introducing outside air, thereby collecting dust and cooling the inside of the apparatus with clean air. . However, in this case, since there is a pressure loss of the air flow due to the filter, a large-capacity cooling fan is required, and there is a problem that the cost is increased in conjunction with the use of a high-performance filter. In addition, when used for a long period of time, the amount of cooling air due to clogging of the filter is reduced, which may cause a rise in the temperature inside the drive device. Therefore, the filter needs to be replaced periodically or depending on the state of the filter, and it is difficult to provide a maintenance-free (maintenance-free) device for a long period of time (for example, 5 years or more).

In addition, the attachment of dust from the outside to the disk or the optical component also occurs in a device that naturally cools the inside of the apparatus through a vent or the like without using a cooling fan.

The present invention has been made in view of the above-mentioned conventional problems, and can effectively prevent dust from adhering to a recording medium and various optical components constituting an optical head. An object of the present invention is to provide a drive device for an optical memory that is appropriately configured so that information can be accurately and stably recorded / reproduced for a long period of time without any problem.

[Means and actions for solving the problem]

In order to achieve the above object, according to the present invention, a motor for rotating the disk-shaped recording medium therein, the motor having a vent on the front surface and an insertion hole for inserting a cassette case for accommodating the disk-shaped recording medium, A drive mechanism having an optical head for recording and / or reproducing information on and from a recording medium, a drive mechanism for the optical head, and a loading mechanism for loading the disk-shaped recording medium;
In a drive device for an optical memory comprising a circuit board for driving and controlling the drive mechanism section, the drive mechanism section is almost completely sealed with a dustproof cover except for the circuit board, so that a flow of outside air into the drive mechanism section is achieved. Should not occur.

〔Example〕

FIG. 1 is an external perspective view of a drive device for an optical memory showing a first embodiment of the present invention, and FIG. 2 is a schematic view of the inside thereof. The front surface 2 of the drive device 1 is provided with an insertion opening 4 for inserting and removing a cassette case 3 for accommodating a disk-shaped recording medium, and the lower side thereof allows ventilation in the drive device 1. Ventilation hole 5 formed of a lattice-shaped through hole for ejecting, and an eject switch 6 for ejecting the cassette case 3 mounted on the drive device 1 from the drive device 1 are provided.

Further, inside the motor, a motor for rotating the disk in the cassette case 3 mounted, an optical head for recording and / or reproducing information on the disk, and driving the optical head in the disk radial direction. A driving mechanism, a loading mechanism for mounting the cassette case 3,
Further, when the disk is a magneto-optical disk, a drive mechanism including a bias magnetic field mechanism for applying an external magnetic field is provided, and power control of a semiconductor laser in an optical head and information reading from the disk are provided. A drive substrate 7 having a processing circuit, a control circuit of a drive mechanism for driving the optical head in the radial direction of the disk, a main circuit for controlling the drive device based on a command from the host, a circuit for decoding commands and correcting errors, etc. Is provided.

In such a drive device 1, after the cassette case 3 is inserted from the insertion slot 4, it is mounted in the drive mechanism by the loading mechanism, and the disk is rotated by the motor. When the eject switch 6 is pressed while the cassette case 3 is mounted in the drive mechanism, the cassette case 3 is held in a state where a part of the cassette case 3 is protruded from the insertion opening 4 on the front surface 2 and is manually removed from this state. You can do it.

In this embodiment, a motor for rotating a disk, an optical head, a drive mechanism for driving the optical head, a loading mechanism, and a drive mechanism including a bias magnetic field mechanism when the disk is a magneto-optical disk, are provided with an insertion port. The cassette case 3 is almost completely sealed with a dustproof cover 9 so that the cassette case 3 can be inserted into and removed from the drive case 4, and is separated from and below the bottom surface of the dustproof cover 9 and parallel to the bottom surface.
And the controller board 8 is arranged facing away from the
The space between the drive board 7 and the controller board 8 is made to act as a duct for an air flow passing through the ventilation hole 5.

As described above, if the drive mechanism of the drive device 1 is almost completely sealed with the dustproof cover 9, no air flow in which the outside air enters will occur in the drive mechanism. It can be effectively prevented from adhering to optical components, so that information can be recorded accurately and stably for a long period of time without causing a decrease in light quantity.
Can be played.

In addition, by acting between the drive board 7 and the controller board 8 as a duct of an airflow passing through the ventilation hole 5, the circuit mounted on these boards 7, 8 can sufficiently secure heat radiation. Since there is almost no functional deterioration of the substrates 7 and 8 due to dust, there is no need to provide a filter in the ventilation port 5 to clean the outside air. Therefore, even when cooling is performed by a cooling fan in the optical memory device, the capacity can be reduced. This makes it possible to reduce the cost of the entire apparatus.

FIG. 3 is a longitudinal sectional side view showing a main part of a second embodiment of the present invention, and FIG. 4 is an exploded perspective view thereof. In this embodiment, a drive device 11 is mounted on an optical memory device 10 of a magneto-optical disk subsystem structure or a built-in type magneto-optical disk personal computer type, and a cooling fan 12 attached to the back of the optical memory device 10 controls a front panel 14 of the drive device 11. The outside air is introduced from outside, and is blown out to the outside. The front panel 14 has an insertion port 16 for inserting and removing a cassette case 15 for accommodating a magneto-optical disk, and ventilation ports 17 and 18 for introducing outside air into the optical memory device 10 on the upper and lower sides thereof, Installed cassette case 15
And an eject switch 19 for ejecting the drive from the drive device 11.

As shown in an exploded perspective view of FIG. 5, the drive unit 11 is fixed to an upper surface of a U-shaped frame 21 having an upper surface and two side surfaces continuous with the upper surface, and a deck unit 22 is provided.
And a field unit 24 is provided on the deck unit 22 via a holder unit 23, and the cassette case 15 is loaded between the deck unit 22 and the field unit 24.

The cassette case 15 attached is installed in the deck unit 22.
A spindle motor 25 for rotating a disk therein, an optical head 26 for recording and / or reproducing information on and from a magneto-optical disk, a drive mechanism 27 for driving the optical head 26 in the disk radial direction, and a cassette. A loading mechanism (not shown) for mounting the case 15 is provided, and the deck unit 22 is provided with an insulator 28 and a support base 29.
And is fixed to the frame 21 via.

Under the deck unit 22, held on the frame 21 so as to form an air flow duct passing through the air port 18, the power control of the semiconductor laser in the optical head 26, the information reading processing circuit from the disk, the optical A drive substrate 31 having a control circuit and the like for a drive mechanism 27 for driving the head 26 in the disk radial direction, a main circuit for controlling the drive device based on a command from the host, a circuit for decoding commands and correcting errors, etc. The controller board 32 is provided facing away from the controller board. The drive board 31 and the controller board 32 are connected by a harness 33, and the harnesses 34 and 35 from the deck unit 22 are connected to the drive board 31 through openings 36 and 37 formed on one side of the frame 21. I do.

In this embodiment, grooves 21 are formed on both side edges of the upper surface of frame 21.
A drive mechanism section having a deck unit 22, a holder unit 23 and a field unit 24 is provided so as to extend and closely contact with these grooves 21a, and closely contact with the front panel 14 between the ventilation holes 17 and 18. A dust-proof cover formed on the frame 21 by shibbing or die-casting to surround the
41 will be provided. The grooves 21a are formed so that the harnesses 34, 35 from the deck unit 22 pass through the openings 36, 37 at one side edge, and rubber or sponge-like sealing members are provided in these grooves 21a. The dustproof cover 41 is attached to the frame 21 so that the dustproof cover 41 is compressed, so that the dustproof cover 41 is attached to the frame 21 in close contact.

The dustproof cover 41 is provided with an opening 42 at a portion corresponding to the insertion opening 16 of the front panel 14, and the opening 42
An opening / closing lid 43 is provided so that the cassette case 15 can be inserted and removed through the insertion port 16. In this embodiment, the opening / closing lid 43
When the cassette case 15 is not mounted, the opening 42 is closed by urging means (not shown), and the cassette case 15 is closed.
When the cassette case 15 is inserted, the cassette case 15 is rotated by the movement of the cassette case 15 against the urging means. After the cassette case 15 is loaded, the rotating front end comes into contact with the upper surface of the cassette case 15 to open the opening 42. Is held open, and when the cassette case 15 is taken out, the opening 42 is closed by being rotated by the urging means with the movement of the cassette case 15.

According to this embodiment, the drive mechanism of the drive device 11 having the deck unit 22, the holder unit 23 and the field unit 24 is provided between the ventilation holes 17 and 18 by a dustproof cover.
Since the air is almost completely sealed at 41, even if the outside air is introduced by the cooling fan 12, no airflow in which the outside air enters the drive mechanism is generated. Therefore, similarly to the first embodiment, it is possible to effectively prevent external dust from adhering to the disk and various optical components constituting the optical head 26, and thus it is possible to transmit information over a long period of time without lowering the light amount. Accurate and stable recording / reproduction is possible.

In addition, since the space between the drive board 31 and the controller board 32 is made to act as a duct for the airflow passing through the air port 18, the heat radiation of the circuits mounted on these boards 31, 32 can be sufficiently ensured. At the same time, since there is almost no functional deterioration due to dust in these substrates 31 and 32, it is not necessary to provide a filter in the ventilation port 18 to clean the outside air, so that the capacity of the cooling fan 12 can be reduced, and no filter is required. Together, the cost of the entire optical memory device 10 can be reduced.

Further, the outside air introduced from the ventilation holes 17 and 18 by the cooling fan 12 flows in contact with the outer surface of the dustproof cover 41, so that the temperature rise of the drive mechanism can be effectively prevented.

FIG. 6 shows a configuration of a main part of a third embodiment of the present invention. This embodiment is different from the second embodiment in that, between the front surface of the dustproof cover 41 of the drive device 11 and the rear surface of the front panel 14, below the insertion port 16, The other configuration is the same as that of the second embodiment.

In this way, if the additional air path 45 is provided, the outside air entering from the insertion port 16 will merge with the outside air from the ventilation port 18 via the additional air path 45, so that the outside air flows into the dustproof cover 41. Is more reliably prevented.

FIG. 7 shows a configuration of a main part of a fourth embodiment of the present invention. This embodiment is different from the second embodiment in that the opening / closing lid 43 of the dustproof cover 41 of the drive device 11 is configured to close the opening 42 when the cassette case 15 is mounted and not mounted. The configuration is the same as in the second embodiment.

As described above, even when the cassette case 15 is mounted, if the opening 42 is closed by the opening / closing lid 43, the deck unit 22 is completely sealed by the frame 21, the dustproof cover 41, and the opening / closing lid 43. , Drive device
It is possible to more reliably prevent the intrusion of dust from the outside into the drive mechanism unit of (11).

FIG. 8 is a longitudinal sectional side view showing a configuration of a main part of an example of an optical memory drive device separately developed by the present inventors, and FIG. 9 is an exploded perspective view thereof. In this drive device, a spindle motor 25 for rotating a disk, an optical head 26 for recording and / or reproducing information on and from the disk, and a voice constituting a drive mechanism for driving the optical head 26 in the disk radial direction. Coil motor (VCM) 51
The base member of the deck unit 22 having the components is provided on the lower surface side of the spindle motor 25 and the VCM 51, and is fixed to the frame 21 via the insulator. In addition, the deck unit 22 is provided with a holder unit 23 for holding and transporting the cassette case via the loading drive plate 52, and the loading drive plate 52 is driven in the front-rear direction of the drive device 11 in front of the deck unit 22. The automatic loading drive unit 53 is provided, and the field unit 24 is provided on the rear side. Further, a front cover unit 54 is provided at the front end of the deck unit 22, and a rear cover 55 is provided at the rear end.

The front cover unit 54 has a front panel 14
Along with providing an opening 42 at a portion corresponding to the insertion port 16,
An opening / closing lid 43 is provided so that a cassette case (not shown) can be inserted into and removed from the opening 42 through the insertion opening 16. In addition,
The opening / closing lid 43 is configured to close the opening 42 by an urging means (not shown) in a mounted state and a non-mounted state of the cassette case.

Further, below the deck unit 22, power control of the semiconductor laser in the optical head 26, information reading processing circuit from the disk, and Drive in the direction
The drive substrate 31 having the control circuit and the like of the VCM 51 and the controller substrate 32 having the main circuit for controlling the drive device based on the command of the host, the command decoding and error correction circuits, and the like are spaced apart from each other. Provide. The drive board 31 is held on the base member of the deck unit 22, and the controller board 32 is connected to and held on the drive board 31 by a board-to-board connector capable of electrical connection and mechanical holding. The harnesses 34, 34 from the deck unit 22 are sandwiched between a base member of the deck unit 22 and the front cover unit 54 or the rear cover 55 via a rubber or sponge-like sealing member (not shown). .

In this drive device, the front cover unit 54,
The rear cover 55 and the dustproof cover are tightly engaged with the deck unit 22 so as to surround the mechanism on the deck unit 22.
41 will be provided.

According to this configuration, the drive mechanism of the drive device 11, that is, the deck unit 22 and the deck unit 22
The mechanism provided above is connected to the front cover unit 54,
Almost completely sealed by the rear cover 55, the dust cover 41 and the base member of the deck unit 22, the cooling fan
Even if outside air is introduced by means of 12, the airflow in which the outside air enters is not generated in the drive mechanism. Accordingly, similarly to the second embodiment, it is possible to effectively prevent external dust from adhering to the disk and various optical components constituting the optical head 26, and thus it is possible to transmit information over a long period of time without lowering the light amount. Accurate and stable recording / reproduction is possible.

Further, since the space between the drive board 31 and the controller board 32 is made to act as a duct for the airflow passing through the ventilation port 18, the heat radiation of the circuits mounted on these boards 31, 32 can be sufficiently ensured. At the same time, since the functions of these substrates 31 and 32 are hardly reduced due to dust, there is no need to provide a filter in the ventilation port 18 to clean the outside air, so that the capacity of the cooling fan 12 can be reduced by the pressure loss caused by the filter. Memory device combined with the need for
10 The whole unit can be made inexpensive.Furthermore, since the spindle motor 25, VCM 51, etc., which are the heat sources of the drive mechanism, are directly attached to the base member of the deck unit 22, the heat generated by these heat sources is Efficiently transmitted to the base member by conduction,
Moreover, since the outside air introduced from the ventilation port 18 by the cooling fan 12 flows in contact with the outer surface of the base member of the deck unit 22, the temperature rise of the drive mechanism can be effectively suppressed within the allowable temperature. Recording and reproduction can be performed stably.

In other words, in recent drive devices, high-speed access and a high transfer rate have led to an increase in the amount of heat generated by an increase in the output of the drive unit along with a reduction in the weight of the optical head, which is a movable unit, and an increase in the rotation speed of the disk. This tends to increase the amount of temperature rise inside the drive device. In this case, if the temperature inside the drive device cannot be controlled within the allowable temperature range, the information recorded on the disc will be destroyed, the life of the laser diode and other electronic components as the light source will be shortened, and the optical components will be damaged. The holding member is thermally deformed to cause an optical axis shift of the light beam, and it is impossible to perform recording and reproduction stably. However, as in this drive device, the spindle motor 25, which is a heat source of the drive mechanism, If the VCM 51 or the like is directly attached to the base member of the deck unit 22 and the heat generated by these heat sources is efficiently transmitted to the base member and cooled by the external air flow, the temperature rise of the drive mechanism will be within the allowable temperature. And recording and reproduction can be performed stably.

According to this development example, similarly to the fourth embodiment, even when the cassette case is mounted, the opening 42 is closed by the opening / closing lid 43, so that the cassette case is mounted and unmounted. Below, deck unit 22
The front cover unit 54, the rear cover 55, the dust cover 41, the base member of the deck unit 22 and the opening / closing lid 43
To provide a nearly complete seal and therefore drive device 11
Thus, the intrusion of dust from the outside into the drive mechanism can be more reliably prevented.

The present invention is not limited to an optical memory device using a magneto-optical disk, but can be effectively applied to a device using an optical disk.

〔The invention's effect〕

As described above, according to the present invention, the drive mechanism other than the circuit board of the drive device is almost completely sealed with the dustproof cover. And effectively prevent external dust from entering and adhering to various optical components that compose the optical head.Also, the heat dissipation of the circuit board can be sufficiently ensured. Information can be accurately and stably recorded / reproduced over the entire area.

[Brief description of the drawings]

1 and 2 are views showing a first embodiment of the present invention, FIGS. 3, 4, and 5 are views showing a second embodiment of the present invention, and FIG. 6 is a view showing a third embodiment of the present invention. FIG. 7, FIG. 7 is a view showing the fourth embodiment, and FIGS. 8 and 9 are views showing an example of an optical memory drive device separately developed by the present inventors. DESCRIPTION OF SYMBOLS 1 ... Drive device, 2 ... Front 3 ... Cassette case, 4 ... Insertion port 5 ... Ventilation port, 6 ... Eject switch 7 ... Drive board, 8 ... Control board 9 ... Dustproof cover Reference numeral 10 Optical memory device 11 Drive device 12 Cooling fan 14 Front panel 15 Cassette case 16 Insertion port 17, 18 Vent 19 Eject switch 21 Frame 21a Groove 22 Deck unit 23 Holder unit 24 Field unit 25 Spindle motor 26 Optical head 27 Driving mechanism 28 Insulator 29 Support base 31 …… Drive board, 32 …… Controller board 33,34,35 …… Harness, 36,37 …… Opening 41 …… Dustproof cover, 42 …… Opening 43 …… Openable lid, 45 …… Additional wind Road 51 …… VCM 52 …… Loading drive plate 53 …… E Auto loading drive unit 54 Front cover unit 55 Rear cover

Claims (1)

(57) [Claims] A motor for rotating the disk-shaped recording medium therein; a motor for rotating the disk-shaped recording medium therein; and a motor for rotating the disk-shaped recording medium. An optical head for performing recording and / or reproduction of a disk, a drive mechanism having a drive mechanism for the optical head, a loading mechanism for loading the disk-shaped recording medium, and a circuit board for driving and controlling the drive mechanism. An optical memory drive device comprising: a drive mechanism portion substantially completely sealed with a dustproof cover except for the circuit board.