JPH10125054A - Disc drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust-proof cap for protecting a circuit board surely against adhesion of dust while shielding an electromagnetic wave noise excellently and preventing electrostatic charging. SOLUTION: A dust-proof cap 40 defines a space for encapsulating a circuit board 24 in conjunction with a body module 15 and an opening 41a is made in the bottom facing the mounting surface of the circuit board 24. A planar member 42 made of a conductive metal plate is fixed to the lower surface of a cap body 41 to close the opening 41a. A tongue part 42a extends radially from the outer circumferential fringe part of the planar member 42 while being connected electrically with a frame 31 through a cable 35. Consequently, the conductive planar member 42 is held at same potential level as the frame 31, a top cover and an under cover, i.e., the ground level part of a printed wiring board 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive such as an optical disk drive and a magneto-optical disk drive for recording or reproducing information on a disk-shaped recording medium such as an optical disk or a magneto-optical disk.

[0002]

2. Description of the Related Art FIGS. 5 and 6 are exploded perspective views of an internal mechanism and a housing of an optical disk drive as an example of a conventional disk drive. The optical disk drive is the same as the present applicant. Patent Application No. 83 of 1996 filed by the applicant on January 8, 1996
It has the same configuration as the optical disk drive described in the specification and drawings attached to the No. 0 application.

An optical disk cartridge 1 stores an optical disk 2 which is a disk-shaped recording medium. Reference numerals 3, 4, 5, and 6 denote a top cover, a face panel, a frame, a rear plate, and an under cover constituting a storage housing 7. A loading mechanism 14 is mounted on the frame 5 via a vibration isolating rubber 8. The face panel 4 has an opening 4a for inserting / ejecting the optical disc cartridge 1 into / from the housing 7. Reference numeral 9 denotes a plate-shaped loading base having an opening 9a, 1
Reference numeral 0 denotes a loading motor unit arranged at the rear end of the loading base 9, and 11 is supported on the loading base 9 so as to be movable in the front-rear direction (directions of arrows A1 and A2) and engages with the loading motor unit 10. The carrier 12 is a cam member fixed to a corner portion of the carrier 11, and the carrier 13 is movably supported on the loading base 9 in the vertical direction (arrows B1 and B2) and engages with the cam member 12. These members 9 to 13 constitute a loading mechanism 14. 15 is the loading base 9 so as to close the opening 9a.
The main body module 15 has an optical head 16 for converging a laser beam on the optical disc 2 and recording or reproducing information.
A spindle motor 17 connected to the optical disk 2 at the recording / reproducing position, a circuit board described later, and the like are mounted.

[0004] Reference numerals 18 and 19 denote dust covers and front covers, which are dustproof members, and form a storage space for the optical disk cartridge 1 inside the storage housing 7 together with the loading base 9 in which the main body module 15 is disposed. On the front cover 19, a dustproof shutter 20 that is opened and closed in conjunction with the insertion / ejection operation of the optical disk cartridge 1 by an opening / closing mechanism (not shown) is arranged. When recording / reproducing on the optical disk 2, the dustproof shutter 20 is closed.
The storage space formed by the dust cover 18, the front cover 19 and the loading base 9 is substantially closed. twenty one
Is a dustproof cap attached to the main body module 15 so as to cover the entire lower surface of the main body module 15, and 22 is an FPC (flexible printed circuit board) 23 for the main body module 15.
A printed wiring board electrically connected to a circuit board disposed on the lower surface. The printed wiring board 22 is fixed to the frame 5 inside the housing 7 and has an upper surface.
The (mounting surface) faces the lower surface of the loading base 9.

FIG. 7 is a side sectional view of the internal mechanism in the optical disk drive shown in FIG. 5, and as shown in this sectional view, a circuit board 24 is disposed on the lower surface of the main body module 15, and the circuit board 24 It is enclosed in a space formed by the main body module 15 and the dustproof cap 21. On the circuit board 24, a primary amplifier for amplifying an output signal from the optical head 16, a modulation circuit for modulating an output signal to the optical head 16, a control circuit for controlling the spindle motor 17, and the like are mounted. Various electrical or electronic mounting components 25 are mounted on the mounting surface of the printed wiring board 22.

Next, the operation of the optical disk drive configured as described above will be briefly described. By inserting the optical disk cartridge 1 into the housing 7 through the opening 4a of the face panel 4, the dustproof shutter 20 is opened in conjunction with the insertion operation of the optical disk cartridge 1. From this state, the optical disk cartridge 1 is
By completely inserting the optical disk 2 into the optical disk cartridge 1, an open / close shutter (not shown) arranged to be openable and closable on the optical disk cartridge 1 is opened to expose the recording surface of the optical disk 2.
The dustproof shutter 20 of the front cover 19 closes. Thereafter, the carrier 11 is loaded by the loading motor unit 10.
Is driven, the holder 13 descends in the direction of arrow B2, and transports the optical disk cartridge 1 together with the holder 13 to the recording / reproducing position. The spindle motor 17 chucks the optical disc 2 conveyed to the recording / reproducing position, and the optical head 16 focuses a laser beam corresponding to a recording signal on a recording surface of the optical disc 2 rotated by the spindle motor 17 to record information. It records or detects reflected light from the recording surface of the optical disc 2 and converts it into a reproduced signal.

According to the optical disk drive device having the above-described configuration, the dust cover 18 and the front cover 19 form a storage space for the optical disk 2 together with the loading base 9 on which the main body module 15 is disposed, and the disk cartridge 1 is positioned at the recording / reproducing position. In the state of, the dustproof shutter 20 is closed so as to substantially seal the storage space,
Dust that has entered the storage housing 7 is prevented from entering the storage space of the optical disk 2. Further, by attaching the dustproof cap 21 to the main module 15 so as to cover the circuit board 24 disposed on the lower face of the main module 15, dust adheres to the circuit board 24 disposed on the lower face of the main module 15. Is prevented.

[0008]

SUMMARY OF THE INVENTION A dustproof cap 21 which forms a space for enclosing a circuit board 24 together with a main body module 15.
Was formed of a synthetic resin in consideration of manufacturing costs, insulation properties, and the like. However, the dustproof cap 21 made of a synthetic resin has general characteristics that the shielding property against electromagnetic wave noise is low and the dustproof cap 21 is easily charged by static electricity. The optical disk drive device using the dustproof cap 21 having such characteristics has the following problems.

First, since the reproduction signal from the optical head 16 and the recording signal to the optical head 16 are weak, they are susceptible to electromagnetic wave noise.
When electromagnetic wave noise from the outside is superimposed on the input / output signal to the 16 through the dustproof cap 21, it causes a recording / reproducing error.

Second, an oscillation circuit (not shown) of a semiconductor laser, which is a laser light source, is usually mounted on a circuit board 24, but emits electromagnetic wave noise to the outside when the semiconductor laser is driven. , This electromagnetic noise is dustproof cap
Leakage outside the printed circuit board 21 affects the printed wiring board 22, external devices, and the like, and causes malfunction of the device.

Thirdly, even when discharge occurs from the dustproof cap 21 charged by static electricity to the circuit board 24, the printed wiring board 22, and other members, it also causes malfunctions and device failure due to electromagnetic wave noise.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dust-proof cap which can reliably prevent dust from adhering to a circuit board, has excellent shielding properties against electromagnetic noise, and is prevented from being charged by static electricity. An object of the present invention is to provide a disk drive.

[0013]

According to a first aspect of the present invention, there is provided a disk drive device comprising: a housing having an insertion / ejection opening for inserting / ejecting a disk-shaped recording medium; A loading mechanism for holding a disc-shaped recording medium inserted from the insertion / ejection port on a loading base and transporting the disc-shaped recording medium to a recording / reproducing position;
A recording / reproducing head for reproducing, a circuit board for processing input / output signals to / from the recording / reproducing head, and the recording / reproducing head and the circuit board are mounted on the loading base so as to cover an opening provided in the loading base. A main body module attached to the lower surface of the loading base,
A printed wiring board electrically connected to the circuit board in the housing, and a storage space for storing a disk-shaped recording medium together with the main body module and the loading base are formed, and the disk-shaped recording medium is located at the recording / reproducing position. In a disk drive device comprising a dustproof member for substantially sealing the storage space in a certain state, the disk drive device is attached to the main body module so as to cover the circuit board disposed on the lower surface of the main body module, and is made of a conductive metal material. It is characterized by having a dustproof cap formed.

According to a second aspect of the present invention, in the disk drive of the first aspect, the casing has electrical conductivity and is electrically connected to a ground potential portion of the printed wiring board. An electromagnetic shield is provided, and the dustproof cap is electrically connected to the electromagnetic shield.

According to a third aspect of the present invention, in the disk drive device, a housing having an insertion / ejection opening for inserting / ejecting the disk-shaped recording medium, and loading the disk-shaped recording medium inserted from the insertion / ejection opening. A loading mechanism for holding on a base and transporting the recording / reproducing position to a recording / reproducing position; a recording / reproducing head for recording / reproducing information on / from the disc-shaped recording medium transported to the recording / reproducing position; A circuit board for processing an output signal, a main body module on which the recording / reproducing head and the circuit board are mounted, and which is attached to a lower surface of the loading base so as to close an opening of the loading base; A printed wiring board electrically connected to the board, and a disk shape together with the main body module and the loading base; A storage space for accommodating a recording medium, and a dustproof member for substantially sealing the storage space when the disk-shaped recording medium is at the recording / reproducing position, wherein the disk drive is disposed on the lower surface of the main body module. A dustproof cap attached to the main body module so as to cover the circuit board is provided.The dustproof cap is formed of a cap body having an opening formed at a bottom portion facing the circuit board, and a metal material having conductivity. A plate-like member formed and fixed to the cap body so as to close the opening, and the opening and the plate-like member form a concave shape separated from the circuit board on the inner surface of the dust-proof cap. It is characterized by doing.

According to a fourth aspect of the present invention, in the disk drive device of the third aspect, the cap body is integrally formed of resin, and the opening of the opening is formed at an outer peripheral edge of the plate-shaped member. A buried portion is provided from the inner peripheral surface to be embedded in the cap body together with the integral molding of the cap body, and a concave portion is formed in an inner portion of the buried portion so as to be separated from the circuit board. .

According to a fifth aspect of the present invention, in the disk drive of the third aspect, the casing has conductivity and is electrically connected to a ground potential portion of the printed wiring board. An electromagnetic shielding portion is provided, and a tongue having elasticity and conductivity is projected from an outer peripheral edge of the plate-shaped member, and the tongue is elastically contacted with the electromagnetic shielding. I do.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of an optical disk drive according to a first embodiment of the present invention. Members corresponding to those described with reference to FIGS. 5, 6, and 7 are denoted by the same reference numerals and will be described. Omitted. 31, 32
And 33 are a frame, a top cover, and an under cover that constitute the storage housing 30 together with the face panel 4,
The loading mechanism 14 is fixed to the frame 31 via the vibration isolating rubber 8, and the printed wiring board 22 is fastened and fixed to the frame 31 by a plurality of screws. Here, the frame 31, the top cover 32, and the under cover 33 are each formed of a conductive metal plate and are electrically connected to each other. An electromagnetic shield is configured to prevent leakage of the electromagnetic wave. Further, the frame 31 is electrically connected to a ground potential portion (not shown) such as a ground circuit on the printed wiring board 22, so that the potential of the frame 31, the top cover 32 and the under cover 33 is reduced. It is kept at the same level as the ground circuit of the printed wiring board 22, that is, at the ground potential or the frame potential.

Reference numeral 34 denotes a dustproof cap formed of a conductive metal material. The dustproof cap 34 covers the entire lower surface of the main body module 15.
To form a space for enclosing the circuit board 24 together with the main body module 15. Reference numeral 35 denotes a cable for electrically connecting the dustproof cap 34 and the frame 31. Here, since the dustproof cap 34 and the frame 31 are connected by the cable 35, the potential of the dustproof cap 34 is at the same level as that of the frame 31, the top cover 32, and the under cover 33, that is, the potential of the printed wiring board 22. It is kept at the same level as the ground potential section.

According to the optical disk drive of the first embodiment described above, the dust-proof cap 34 is made of a conductive metal material, so that the dust-proof cap 34 is made of a dust-proof material compared to a synthetic resin. The shielding performance against electromagnetic wave noise by the cap 34 is increased, and the dust cap 34 is prevented from being charged by static electricity.
In addition, the heat dissipation of the dust cap 34 is improved. Further, the dust-proof cap 34, together with the frame 31, the top cover 32 and the under cover 33 constituting the electromagnetic shielding portion,
By being electrically connected to the ground potential portion 22, the potential of the dustproof cap 34 can be held at the ground potential or the frame potential, so that the shielding property against electromagnetic noise can be further improved and the dustproof cap can be improved. 34 can be reliably prevented from being charged by static electricity. As a result,
It is possible to prevent recording / reproducing errors and malfunctions from occurring due to the influence of electromagnetic noise on the circuit board 24 and the printed wiring board 22 and the discharge from the dust cap 34, and the heat generated from the circuit board 24 etc. raises the inside of the dust cap 34. Since the heating is suppressed, the thermal load on the circuit board 24 and the like can be reduced, and the failure and malfunction of the device can be suppressed.

FIG. 2 is a side sectional view showing a main part of an optical disk drive according to a second embodiment of the present invention. Members corresponding to those described with reference to FIGS. 1 and 5 to 7 are the same. The description is omitted by attaching reference numerals. Reference numeral 40 denotes a dustproof cap which is attached to the main body module 15 so as to cover the lower surface of the main body module 15, and forms a space for enclosing the circuit board 24 together with the main body module 15. A cap body 41 having an opening 41a formed in a bottom portion facing the mounting surface of the opening 24, and an opening 41 formed of a conductive metal plate.
It is composed of a plate-like member 42 fixed to the lower surface of the cap main body 41 so as to close a.

An opening 41a is bored in the cap body 41, and the plate-like member 42 is fixed to the lower surface of the cap body 41 to close the opening 41a.
On the inner surface of the circuit board 24, the opening 41a and the plate-like member 42
A concave shape is formed so as to be separated from the cap member 41. By this concave shape, an extra clearance corresponding to the thickness of the cap body 41 is secured for the mounted components on the circuit board 24. Here, the plate member 42 is a flat metal plate,
Even if the thickness is reduced, sufficient strength is ensured even when, for example, about 0.1 mm.Thus, even when the cap main body 41 must be formed thick in consideration of strength and moldability, the main body module 15 can be formed. By attaching the dustproof cap 40 to
An increase in the device size in the height direction can be suppressed. Further, a tongue piece 42a extending in the radial direction is formed on the outer peripheral edge of the plate member 42, and this tongue piece 42a is
It is electrically connected to the frame 31 by a cable 35. Accordingly, the potential of the conductive plate-shaped member 42 is maintained at the same level as the frame 31, the top cover 32, and the under cover 33, that is, at the same level as the ground potential portion of the printed wiring board 22.

Reference numeral 43 denotes a circuit board 24 and a printed wiring board.
FPC (flexible printed circuit board) to connect with 22,
Reference numeral 44 denotes a seal member formed of an elastic material. The seal member 44 is inserted between the stage 15a of the main body module 15 and the bottom surface of the cap main body 41 in a compressed state. The FPC 43 has an insertion hole 41 formed in the cap body 41.
B and the cut formed in the seal member 44 extend through the dustproof cap 40 to the outside. Seal member 44
Is pressed against the FPC 43 so that there is no gap between the cuts, and the dustproof cap 40 prevents dust and the like from entering the space inside the circuit board 24.

According to the optical disk drive device of the second embodiment described above, since the plate-like member 42 is formed of a conductive metal material, it can be compared with the one formed entirely of a synthetic resin. And the shielding performance against electromagnetic noise by the dustproof cap 40 is increased,
The dust cap 40 is prevented from being charged by static electricity. Further, since the plate-like member 42 is electrically connected to the ground potential portion of the printed wiring board 22 together with the frame 31, the top cover 32 and the under cover 33 constituting the electromagnetic shielding portion, the potential of the dustproof cap 40 is reduced. Since it can be maintained at the ground potential, the shielding property against electromagnetic wave noise can be further enhanced, and the dustproof cap 40 can be reliably prevented from being charged by static electricity. As a result, the circuit board
It is possible to prevent the occurrence of recording / reproducing errors and malfunctions due to the influence of electromagnetic wave noise on the printed circuit board 24 and the printed wiring board 22 and the discharge from the dustproof cap 34.

FIG. 3 is a side sectional view showing another example of the plate member according to the second embodiment of the present invention. The plate-like member 42 is formed with a tongue piece 42b extending in the radial direction at an outer peripheral edge thereof. The tongue piece 42b has conductivity and sufficient elasticity, and has a semi-finished tip portion. A curved portion 42c formed in a cylindrical shape and protruding upward is provided. Then, in a state where the main body module 15 is mounted on the frame 31 together with the loading mechanism 14, the tongue piece 42b has an upper surface of a stay portion 31a that projects a horizontal portion formed at the tip from the curved portion 42c substantially horizontally from the frame 31. To make the elastic force always act on the stay portion 31a. At this time, the entire tongue piece 42b is bent upward, and the curved portion 42c is elastically deformed so as to increase its radius of curvature. By forming such a curved portion 42c that can be elastically deformed in the vertical direction near the tip of the tongue piece 42b, the flexible stroke of the entire tongue piece 42a in the vertical direction is enlarged.

As described above, the loading mechanism 14
It is mounted on the frame 31 via the vibration isolating rubber 8. The vibration damping rubber 8 elastically deforms and generates deformation resistance when an external vibration or impact acts on the device, thereby absorbing kinetic energy to attenuate the impact and converging the vibration in a short time. To work. Therefore, the loading mechanism 14 is displaced with respect to the frame 31 in response to the deformation of the anti-vibration rubber 8 during the action of vibration or impact. Even if such a displacement occurs, it is possible to easily impart a sufficient flexible stroke to the tongue piece 42b in the up-down direction, that is, larger than the maximum deformation amount of the vibration-proof rubber 8.
Therefore, a sufficient flexible stroke is given to the tongue piece 42b,
By providing an elastic deformation larger than the maximum deformation amount of the vibration isolating rubber 8 in the initial state, it is possible to maintain the state of contact with the stay 31a by following the displacement of the loading mechanism 14 even when a vibration or an impact is applied. Therefore, the potential of the conductive plate member 42 is reliably maintained at the same level as the frame 31, the top cover 32, and the under cover 33, that is, at the same level as the ground potential portion of the printed wiring board 22. .

The tongue piece 42b described above with reference to FIG.
According to the plate-like member 42 on which the tongue piece 42 shown in FIG.
Compared with the plate member 42 formed with a, the cable 35 for connecting the plate member 42 and the frame 31 can be eliminated, and the plate member 42 and the frame 31 are connected by the cable 35. Since it is possible to omit the operation, the cost of the apparatus can be reduced and the assembling operation can be simplified.

FIG. 4 is a side sectional view showing another example of the dustproof cap according to the second embodiment of the present invention. 50 is the main body module so as to cover the entire lower surface of the main body module 15.
15 and mounted on the circuit board 24 together with the main module 15.
The dust-proof cap 50 forms a space for enclosing the circuit board 24.The dust-proof cap 50 is formed of a synthetic resin and has a cap body 51 having an opening 51a formed in a bottom portion facing the mounting surface of the circuit board 24, and a conductive body. A plate-shaped member formed of a metal plate having an integral part with the cap body 51 so as to close the opening
52. Here, the plate-shaped member 52 is formed by, for example, drawing a flat metal plate to form a flange-shaped embedded portion 52a leaving a flat portion on the outer peripheral edge, and the circuit board 24 inside the embedded portion 52a. A concave portion 52b which is bent so as to be separated therefrom is formed. further,
The plate-like member 52 is formed with a tongue piece 52c extending in the radial direction from the outer peripheral end of the buried portion 52a.

The cap body 51 is formed integrally with a synthetic resin.
Is embedded in the inside of the cap body 51 from the inner peripheral surface of the opening 51a, thereby being integrated with the plate member 52 and assembled as a dustproof cap 50, and also a plate member integrated with the cap body 51. 52 protrudes the vicinity of the tip of the tongue piece 52c from the side surface of the cap body 51 to the outside. This tongue piece 52
c is electrically connected to the frame 31 by a cable 35. Accordingly, the potential of the conductive plate member 52 is maintained at the same level as the frame 31, the top cover 32, and the under cover 33, that is, at the same level as the ground potential portion of the printed wiring board 22.

In the dustproof cap 50 described with reference to FIG. 4, the opening 51a formed in the cap body 51 is closed by the plate member 52 having the concave portion 52b separated from the circuit board 24. Accordingly, on the inner surface of the dustproof cap 50, an extra clearance corresponding to the thickness of the cap main body 51 is secured with respect to the mounted components on the circuit board 24 by the concave portion 52b. Here, the plate-shaped member 52 is a flat-shaped metal plate, and a sufficient strength is ensured even when the thickness is reduced, for example, about 0.1 mm. Even in the case where the main body 51 must be formed to be thick, by attaching the dustproof cap 50 to the main body module 15, it is possible to suppress an increase in the device size in the height direction. Further, the cap body 51 is integrally molded of synthetic resin, and the embedded portion 52 of the plate-like member 52 is integrally molded.
a is embedded in the cap body 51 so that the plate-shaped member 5
2 is fixed to the cap body 51 with high strength, and the plate member 52 is attached to the cap body 51 at the same time as the molding of the cap body 51, so that the pressing force or impact from the FPC 43 acts on the plate member 52 However, it is possible to reliably prevent the plate-shaped member 52 from falling off from the cap main body 51, and to simplify the assembly process of the device.

[0031]

As described above, according to the first aspect of the present invention,
According to the disk drive device described above, by attaching a dustproof cap formed of a conductive metal material attached to the main body module so as to cover the circuit board disposed on the lower surface of the main body module, As compared with the formed one, the dustproof cap has a higher shielding property against electromagnetic wave noise, the dustproof cap is suppressed from being charged by static electricity, and the heat dissipation of the dustproof cap is improved, so that the circuit board and the printed wiring board are improved. Recording and reproducing errors and malfunctions due to the influence of electromagnetic noise and discharge from the dust-proof cap, and the temperature inside the dust-proof cap is suppressed by the heat generated from the circuit board. It is possible to reduce the thermal load on the device and the like, thereby suppressing the failure and malfunction of the device.

According to the disk drive device of the second aspect, the housing is provided with an electromagnetic shield portion which is conductive and is electrically connected to the ground potential portion of the printed wiring board, and is provided with a dustproof cap. By electrically connecting to the electromagnetic shielding part, the potential of the dustproof cap can be maintained at the ground potential, so that the shielding property against electromagnetic noise can be further improved, and the dustproof cap can be charged by static electricity. As a result, recording / reproducing errors and malfunctions can be more reliably prevented.

According to a third aspect of the present invention, there is provided the disk drive device, further comprising a dustproof cap attached to the main body module so as to cover the circuit board disposed on the lower surface of the main body module. A cap body having an opening formed on the opposed bottom, and a plate-shaped member formed of a conductive metal material and fixed to the cap body so as to cover the opening, the opening and the plate-shaped member being By forming a concave shape on the inner surface of the dustproof cap so as to be separated from the circuit board and securing a clearance for the mounted components on the circuit board, the dustproof cap can be compared with that formed entirely of synthetic resin. As a result, the shielding performance against electromagnetic noise due to the dust increases, and the dust cap is prevented from being charged by static electricity. In addition, since sufficient strength is ensured even if the thickness of the plate-shaped member is reduced, even if the cap body must be formed thick in consideration of strength and moldability, the dustproof cap is attached to the main body module. By mounting the device, it is possible to suppress the device size from increasing in the height direction.

According to the disk drive device of the fourth aspect, the cap body is integrally formed of resin, and is embedded in the cap body from the inner peripheral surface of the opening at the outer peripheral edge of the plate-shaped member. The buried portion is provided, and a concave portion is formed inside the buried portion so as to be separated from the circuit board. Since the clearance corresponding to the thickness is secured, it is possible to suppress an increase in the device size in the height direction due to the attachment of the dustproof cap, and further, the plate-like member is fixed to the cap body with high strength, and the cap body is The plate-like member is attached to the cap body at the same time as the molding, so when pressure or impact from the FPC or the like that connects the circuit board and the printed wiring board acts on the plate-like member Also, it can reliably prevent the plate member from the cap body from falling off, and it is possible to simplify the assembly process of the device.

According to the disk drive device of the fifth aspect, the housing is provided with an electromagnetic shield portion having conductivity and electrically connected to the ground potential portion of the printed wiring board, and the plate-like member is provided. An elastic and conductive tongue protrudes from the outer peripheral edge of the tongue, and the tongue is elastically brought into contact with the electromagnetic shielding part, so that the loading mechanism is displaced during the action of vibration or impact. Even in this case, the tongue portion can follow the displacement of the loading mechanism to maintain the contact state between the tongue portion and the electromagnetic shielding portion. The same potential as that described above can be used, the shielding performance against electromagnetic noise by the dust cap can be enhanced, and the dust cap can be reliably prevented from being charged. Furthermore, the cable for connecting the plate-shaped member and the frame can be eliminated, and the work of connecting the plate-shaped member and the frame by the cable can be omitted, thereby reducing the cost of the apparatus and assembling. Work can be simplified.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an optical disc drive device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a main part of an optical disk drive according to a second embodiment of the present invention;

FIG. 3 is a side sectional view showing another example of the plate member according to the second embodiment of the present invention.

FIG. 4 is a side sectional view showing another example of the dustproof cap according to the second embodiment of the present invention.

FIG. 5 is an exploded perspective view of an internal mechanism in an optical disk drive as an example of a conventional disk drive.

FIG. 6 is an exploded perspective view of a housing in an optical disk drive as an example of a conventional disk drive.

7 is a side sectional view of an internal mechanism in the optical disk drive shown in FIG.

[Explanation of symbols]

1 ... optical disk cartridge, 2 ... optical disk, 4
... face panel, 4a ... opening, 9 ... loading base, 14 ... loading mechanism, 15 ... body module, 22 ... printed wiring board, 24 ... circuit board, 25 ...
Mounted parts, 30 ... storage case, 34, 40, 50 ... dustproof cap, 35 ... cable, 41 ... cap body, 41a, 51a
... Opening, 42,52 ... Plate member, 42a, 42b, 52c ... Tongue piece, 42c ... Bending part, 43 ... FPC (flexible / wiring board), 52a ... Buried part, 52b ... Concave part.

Claims (5)

[Claims] 1. A housing having an opening for inserting / ejecting a disk-shaped recording medium, and a disk-shaped recording medium inserted from the insertion / ejecting port being held on a loading base to be at a recording / reproducing position. A loading mechanism for transporting, a recording / reproducing head for recording / reproducing information on / from the disc-shaped recording medium transported to the recording / reproducing position, a circuit board for processing input / output signals for the recording / reproducing head, A main body module on which a recording / reproducing head and the circuit board are mounted, and which is attached to a lower surface of the loading base so as to close an opening provided in the loading base; and which is electrically connected to the circuit board in the housing. And a storage space for storing a disk-shaped recording medium together with the main body module and the loading base. And a dust-proof member that substantially seals the storage space when the disk-shaped recording medium is at the recording / reproducing position, wherein the circuit board covers the circuit board disposed on the lower surface of the main body module. A disk drive device comprising: a dustproof cap attached to a main body module and formed of a conductive metal material. 2. The apparatus according to claim 1, wherein the housing has an electromagnetic shielding portion having conductivity and electrically connected to a ground potential portion of the printed wiring board, and the dustproof cap is electrically connected to the electromagnetic shielding portion. 2. The disk drive according to claim 1, wherein the disk drive is connected. 3. A housing having an opening for inserting / ejecting a disk-shaped recording medium, and a disk-shaped recording medium inserted from the insertion / ejecting port being held on a loading base and moved to a recording / reproducing position. A loading mechanism for transporting, a recording / reproducing head for recording / reproducing information on / from the disc-shaped recording medium transported to the recording / reproducing position, a circuit board for processing input / output signals for the recording / reproducing head, A main body module on which a recording / reproducing head and the circuit board are mounted, and which is attached to a lower surface of the loading base so as to close an opening of the loading base; and a printed wiring electrically connected to the circuit board in the housing. Forming a storage space for storing a disk-shaped recording medium together with the substrate and the main body module and the loading base; and A disk drive device comprising: a dust-proof member for substantially sealing the storage space when the disk-shaped recording medium is at the recording / reproducing position; wherein the main body module covers the circuit board disposed on the lower surface of the main body module A cap body having an opening formed at the bottom facing the circuit board; and a cap body formed of a conductive metal material and covering the opening. And a plate-like member fixed to the dust-proof cap, wherein the opening and the plate-like member form a concave shape separated from the circuit board on the inner surface of the dust-proof cap. 4. An embedded part which is integrally molded with the cap body from a resin, and is embedded in an outer peripheral edge of the plate-like member from the inner peripheral surface of the opening in the cap main body together with the integral molding of the cap main body. To the inside of this buried part,
4. The disk drive according to claim 3, wherein a concave portion is formed so as to be separated from the circuit board. 5. An electro-magnetic shielding portion having conductivity and being electrically connected to a ground potential portion of the printed wiring board, and having elasticity and conductivity from an outer peripheral edge of the plate member. 4. The disk drive according to claim 3, wherein a tongue piece having a tongue is projected, and the tongue piece is elastically brought into contact with the electromagnetic shield.