JP2000285618A - Disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect an optical pickup from shocks by providing a buffer member in the movable portion of the optical pickup without using a floating mechanism, and to miniaturize a disk player. SOLUTION: This device 1 is provided with a support 2 for supporting an optical head 3, guiding members 10 and 11 for guiding the support 2 to move in the radial direction of disk, fist buffer members 14 and 16 provided in the inner peripheral sides of the guiding members 10 and 11 to buffer clashing with the support 2, and a second buffer member 18 provided in a disk outer peripheral side to buffer the collision with the support 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device such as a mini disk, a magneto-optical disk, and a compact disk, and more particularly, to a disk drive which is provided with a cushioning member so that shocks can be effectively absorbed and reduced in size. It concerns the device.

[0002]

2. Description of the Related Art In recent years, the number of disk players using optical disks such as mini disks (MD) and compact disks (CD) as portable electronic devices has been increasing, and they have become smaller, lighter, and thinner so as to be more portable. Is required. A mini-disc player will be described as an example of such a disc player.

FIG. 9 is a schematic side sectional view of a conventional mini-disc player. The mini-disc player 41 includes a top panel 42, a bottom panel 43,
2, a mini disc drive device 48 including a cartridge holder 44, a spindle motor 45, an optical pickup, a chassis 47, and the like housed in the cartridges 43. A pair of brackets 50 is provided on the bottom panel 43.
One end of the bracket 50 is fixed, and the other end of the bracket 50 is
The chassis 47 is attached via a screw 52. That is, the chassis 47 and the mini disk drive device 48 are supported in a floating state with respect to the bottom panel 43, and the floating mechanism absorbs an impact applied to the mini disk player.

[0004]

In the above-described mini disc player, the mini disc drive device 48, particularly the optical pickup, is protected from impacts.
A floating mechanism is employed, and the chassis 47 and the mini disk drive device 48 are supported via a cushion member such as rubber 51 so as to be in a floating state with respect to the bottom panel 43. Therefore, as the floating movable part, for example, the cartridge holder 4
An extra gap Z is required between the top panel 4 and the top panel 42, which is an obstacle to miniaturizing the mini disc player.

Accordingly, an object of the present invention is to provide a disk drive apparatus which solves the above-mentioned problem by providing a buffer member at a movable portion of an optical pickup without using a floating mechanism. It is.

[0006]

According to the present invention, there is provided a disk drive apparatus comprising: a support for supporting an optical head; a guide member for guiding the support to move in the disk radial direction; and the disk of the guide member. A first buffer member provided on the inner peripheral side of the disk for buffering collision with the support, and a second buffer provided on the outer peripheral side of the disk for buffering collision with the support. And a member.

In the disk drive device according to the present invention,
When the support for supporting the optical head moves toward the inner peripheral side of the disk along the guide member due to the impact, the impact is buffered by the first buffer member. On the other hand, when the support for supporting the optical head moves to the outer peripheral side of the disk along the guide member due to the impact, the impact is buffered by the second buffer member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk drive according to the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a configuration of a mini disk drive device to which the present invention is applied. Mini disk drive 1
Is a substantially rectangular parallelepiped optical pickup body 2 as a support
And an optical head 3 for recording / reproducing to / from a mini-disc is accommodated in the optical pickup main body 2, and the optical head 3 is provided with an objective lens 4 for imaging a laser on a disc surface. . A spindle motor 7 for rotating the mini-disc and a turntable 8 for mounting the mini-disc fixed to the axis of the spindle motor 7 are provided substantially at the center of the chassis 5 of the mini-disc drive 1.
Is provided.

In order to allow the optical pickup main body 2 to slide in the radial direction of the mini-disc, a rod-shaped guide 10 and a plate-shaped guide 11 are provided as guide members, and the rod-shaped guide 10 is a pair of circles extending from the optical pickup main body 2. The plate-shaped guide 11 is inserted through the hole bearings 2 a, 2 a, and the guide 2 b having a concave groove of the optical pickup main body 2.
Has been inserted. Both ends of the rod-shaped guide 10 are bearing members 1
It is supported by the chassis 5 via 2 and 13. A first buffer member for buffering an impact generated by a collision between the optical pickup main body 2 and the chassis 5 is provided on the spindle motor 7 side of the rod-shaped guide 10, that is, on the inner peripheral side of the mini disk (hereinafter, abbreviated as the inner peripheral side). Is inserted.

The plate-like guide 11 is fixed to the chassis 5,
A stopper portion 11a is provided on the outer peripheral side (hereinafter, abbreviated as the outer peripheral side) of the mini-disc of the plate-shaped guide 11. A notch 5 a is formed at a position on the inner peripheral side of the plate guide 11 of the chassis 5.
The notch 5a is provided with a projection 15 so as to face the plate-like guide 11 (see FIG. 3). An elastic member having a U-shape in side view, for example, an elastic member 16 made of a synthetic resin is fitted to the projection 15 as a first buffer member. A buffer member 18 as a second buffer member is provided at a central portion of the optical pickup main body 2, that is, at a portion of the chassis 5 abutting on the outer peripheral side of the optical head 3 portion.

According to the present invention, in order to buffer an impact applied to the optical pickup main body 2, the inner peripheral side is buffered by a ring rubber 14 and an elastic member 16 as a first buffering member, and the outer peripheral side is provided by a second buffering member. A certain buffer member 18 is used for buffering.

Round hole bearing 2a of optical pickup body 2
A shaft engaging portion 2c for engaging the screw shaft 20, which is a lead screw, for example, and moving the optical pickup main body 2 in the radial direction of the mini-disc is provided on the outside of the optical disc. A square hole 2d is formed in the shaft engaging portion 2c.
A leaf spring 21 which is an engagement member is mounted on d and its periphery.

The optical pickup body 2 is connected to a holder 23, a magnetic head support 24 fixed to the holder 23, and a magnetic head 25 via a connecting plate 22. Connecting plate 2
A base end of a holder 23 is rotatably supported at an upper end of the holder 2 via a shaft 27, and the holder 23 is urged downward by a compression spring 28 wound around the shaft 27. A shaft 29 protrudes from the left side of the holder 23, and the shaft 29 abuts on an upper surface of a cam (not shown) so as to restrict the downward movement of the holder 23, the magnetic head support 24, and the magnetic head 25. It has become.

In this mini-disc drive, when the screw shaft 20 is rotated by a feed mechanism (not shown), the optical pickup main body 2 is engaged by a not-shown engagement projection of a leaf spring 21 which engages with a valley of the screw shaft 20. The magnetic head 25, the magnetic head support 24, and the holder 23 move along with the rod-shaped guide 10 and the plate-shaped guide 11, and move together. When the cartridge is mounted on a disc holder (not shown), sliding shutters provided on both sides of the cartridge are opened, openings on both sides of the cartridge are opened, and both the upper and lower disc surfaces of the mini disc are exposed. At the time of recording or reproduction on the mini disk, the tip of the magnetic head support 24 enters the cartridge through the upper opening, and the magnetic head 25 is positioned near the top surface of the mini disk.

In this mini-disc drive, information recorded on the mini-disc is reproduced by the objective lens 4 irradiating the mini-disc with laser light and reading the reflected light. Further, when a part of the mini disk is heated by the light irradiated from the objective lens 4 to activate the magnetic recording material applied thereon, and a magnetic field corresponding to the recording information is applied to the part activated by the magnetic head 25. The direction of the magnetic field of the magnetic recording material changes, and this is cooled and fixed, so that information can be recorded. Therefore, overwriting in which new information (signal) is overwritten on the recorded old information (signal) can be realized.

Next, each buffer member will be described in detail. FIG. 2 is an enlarged plan sectional view of a ring rubber portion. A ring rubber 14 for buffering an impact generated by a collision between the optical pickup main body 2 and the chassis 5 is inserted into the inner peripheral side of the rod-shaped guide 10. The bearing member 12 has a shallow concave groove 12a, and one end of the rod-shaped guide 10 is inserted into the concave groove 12a. Since the tip of the rod-shaped guide 10 is hemispherical, the rod-shaped guide 10 can be rotated and removed in the direction of arrow A, and the ring rubber 14 can be removed or inserted. When the rod-shaped guide 10 is rotated in the direction of arrow B, the tip of the rod-shaped guide 10 is
Is fitted and inserted into the concave groove 12a.

On the other hand, a projection 31 is provided at a portion of the chassis 5 where the ring rubber 14 abuts. The protrusion 31 has a pair of abutting portions 31 a that abut against the ring rubber 14, a concave groove portion 31 b that does not abut against the rod-shaped guide 10, and a ring rubber 1.
A bent portion 31c is formed so as to bend around the back of the wire 4. The distal end of the bent portion 31c is arranged to protrude from the outer periphery of the ring rubber 14 by a length C in the radial direction of the ring rubber 14 and to protrude forward by a length D from the distal end surface of the ring rubber 14. . The reason why the bent portion 31c protrudes in the radial direction of the ring rubber 14 by the length C is to prevent the ring rubber 14 from moving toward the optical pickup main body 2 and hindering the operation of the optical pickup main body 2. is there. The reason why the bent portion 31c protrudes forward by a length D from the tip of the ring rubber 14 is to facilitate the insertion of the ring rubber 14.

An impact is given to the mini disc player,
When the engagement between the screw shaft 20 and the leaf spring 21 is released and the optical pickup main body 2 moves in the inner peripheral side of the mini-disc along the rod guide 10 and the plate guide 11, the round hole bearing 2a becomes ring rubber. 14 and ring rubber 14
The shock is absorbed and buffered by the elasticity of. At this time, the pair of abutting portions 31a of the protruding portion 31 on the chassis 5 side do not abut on the entire rear surface of the ring rubber 14, but partially abut.
The buffer effect of the ring rubber 14 can be enhanced.

FIG. 3 is a side sectional view showing the elastic member 16 on the plate-like guide 11 side. The elastic member 16 is formed of a groove 16a for fitting with the projection 15 protruding from the chassis 5 and a spring 16b having a U-shaped elasticity in a side view. Impact is applied to the mini-disc player and the screw shaft 2
0 is disengaged from the leaf spring 21 and the optical pickup main body 2 moves toward the inner peripheral side of the mini-disc along the rod-shaped guide 10 and the plate-shaped guide 11, the optical pickup is moved to the spring portion 16 b of the elastic member 16. The guide portion 2b of the main body 2 collides, and the spring portion 16b of the elastic member 16 bends so as to narrow the U-shaped opening side, so that the impact of the optical pickup main body 2 is buffered.

FIG. 4 shows a buffer member 1 on the outer peripheral side of the mini disk.
FIG. 5 is a front view of FIG. 8, and FIG. A buffer member 18 is provided at a central portion of the optical pickup main body 2, that is, at a portion of the chassis 5 abutting on the outer peripheral side of the optical head 3 portion. The cushioning member 18 has, for example, a rectangular parallelepiped shape, and has a square hole 1 for insertion into the bent portion 5b of the chassis 5 at the center.
8a is drilled. When the buffer member 18 is inserted into the bent portion 5b of the chassis 5, the distal end of the bent portion 5b is located at a position retracted from the distal end surface of the buffer member 18, so that even if the optical pickup body 2 collides with the buffer member 18, it is bent. It does not come into contact with the portion 5b.

An impact is given to the mini disc player,
When the engagement between the screw shaft 20 and the leaf spring 21 is released and the optical pickup main body 2 moves toward the outer peripheral side of the mini-disc along the rod guide 10 and the plate guide 11, the central portion of the optical pickup main body 2 is buffered. It collides with the member 18, and the shock is absorbed by the elasticity of the cushioning member 18.

FIG. 6 is a front view showing a second example of the second cushioning member. In the cushioning member 33, a square hole 33a for insertion into the bent portion 5b of the chassis 5 is formed at the center.
The square hole 33a is wider in the vertical direction than the cross section of the bent portion 5b, and when the bent portion 5b is inserted into the square hole 33a, the protrusion 3 protruding vertically in the square hole 33a.
3b abuts on the bent portion 5b, and is mounted on the bent portion 5b so that the buffer member 33 does not rattle. Further, the buffer member 33 is provided with extending portions 33c extending in the vertical direction at four corners. Thus, the distance L from the upper portion of the buffer member 33 for receiving the optical pickup body 2 to the lower portion of the buffer member 33 for receiving the buffer member 33 on the chassis 5 can be increased, and the buffer effect can be enhanced.

FIG. 7 is a front view showing a third example of the second cushioning member, and FIG. 8 is a sectional view taken along line FF of FIG. The buffer member 35 has an abutting portion 3 for receiving the optical pickup main body 2 at an upper portion.
5a is provided, a V-shaped notch 35b is formed in the contact portion 35a, and an extension 35c extending in the left-right direction from both left and right sides is formed below the contact portion 35b. The lower end of the cushioning member 35 is fixed to the housing 36, and the projection 5c of the chassis 5 enters and engages with the notch 35b.

The cushioning member 35 supports the chassis 5 via a projection 5c engaging with the notch 35b, and
The portion 5c is attached to the chassis 5. Buffer member 35
The pair of extending portions 35c stably receive an impact received from the optical pickup main body 2 by the contact portion 35a.
It is for communicating to. Further, the distance M from the contact portion 35a of the buffer member 35 that receives the optical pickup main body 2 to the housing 36 that receives the buffer member 35 can be increased, and the buffer effect can be further enhanced.

As shown in FIG. 1, when an impact is applied to the mini-disc player in the direction of the arrow X which is the axial direction of the mini-disc (the axial direction of the turntable 8), the rod-shaped guide 10 bends and its impact energy is reduced. Is to be absorbed.

When an impact is applied to the mini-disc player in the + Y direction, which is the inner circumferential direction of the mini-disc,
The engagement between the screw shaft 20 and the leaf spring 21 is released, the optical pickup main body 2 moves in the + Y direction along the rod guide 10 and the plate guide 11, and the round hole bearing portion 2a collides with the ring rubber 14 and The shock is absorbed by the elasticity of the ring rubber 14. At the same time, the guide 2b of the optical pickup body 2
Collides with the spring portion 16b of the elastic member 16, and the spring portion 16b
Is bent by the elasticity so that the opening side of the U-shape is narrowed, and the impact is buffered. Therefore, the impact in the + Y direction applied to the optical pickup main body 2 is effectively buffered by the ring rubber 14 and the elastic member 16.

On the other hand, when an impact is applied to the mini-disc player in the -Y direction, which is the outer peripheral direction of the mini-disc, the engagement between the screw shaft 20 and the leaf spring 21 is released, and the optical pickup main body 2 is connected to the rod-shaped guide 10 and The optical pickup body 2 moves in the −Y direction along the plate-shaped guide 11, and the central portion where the center of gravity of the optical pickup body 2 is located collides with the buffer member 18, and the buffer member 18
The shock is absorbed by the elasticity of the material.

Accordingly, the impact applied to the optical pickup main body 2 is buffered by the ring rubber 14 and the elastic member 16 as the first buffering member, while the impact in the outer peripheral direction of the mini-disc is absorbed by the second rubber member. The optical pickup main body 2 can be reliably protected from an impact.

Further, a first buffer member and a second buffer member are provided in the moving portion of the optical pickup main body 2 so that the optical pickup main body 2 can be protected from an impact, so that it is not necessary to adopt a floating mechanism as in the prior art. Therefore, the mini disc player can be reduced in size accordingly.

In the above-described embodiment, the disk drive device is applied to the mini disk drive device. However, the present invention is not limited to this, and other disk drive devices such as a magneto-optical disk (MO) and a compact disk (CD) may be used. Of course, it may be possible. In addition, the mini disc drive device capable of recording or reproduction is described, but the present invention is not limited to this, and it is needless to say that a mini disc drive device dedicated to reproduction may be used.

[0031]

As described above, according to the present invention,
The impact applied to the support supporting the optical head can be buffered by the first buffer member and the second buffer member, and the support supporting the optical head can be reliably protected from the impact.

Also, a first buffering member and a second buffering member are provided at the moving portion of the support for supporting the optical head, and the optical head and the support can be protected from impact. It is not necessary to reduce the size of the disc player.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a mini disk drive device to which a disk drive device according to the present invention is applied.

FIG. 2 is an enlarged plan sectional view of a ring rubber portion.

FIG. 3 is a side sectional view of an elastic member.

FIG. 4 is a front view of a second cushioning member.

FIG. 5 is a sectional view taken along the line EE of FIG. 4;

FIG. 6 is a front view showing a second example of the second cushioning member.

FIG. 7 is a front view showing a third example of the second cushioning member.

FIG. 8 is a sectional view taken along line FF of FIG. 7;

FIG. 9 is a schematic side sectional view of a conventional mini-disc player.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mini disk drive device 2 Optical pickup main body (support) 2a Round hole bearing part 2b Guide part 3 Optical head 4 Objective lens 5 Chassis 7 Spindle motor 10 Bar-shaped guide (guide member) 11 Plate-shaped guide (guide member) 12,13 Bearing member 14 Ring rubber (first cushioning member) 16 Elastic member (first cushioning member) 18 Buffering member (second cushioning member) 31 Projection 33 Buffering member (second cushioning member) 35 Buffering member (second cushioning member) 2 cushioning member)

Claims (6)

[Claims] A support member for supporting the optical head; a guide member for guiding the support member to move in the disk radial direction; and a support member provided on an inner peripheral side of the disk of the guide member. A disk comprising: a first buffer member for buffering a collision; and a second buffer member provided on an outer peripheral side of the disk and configured to buffer a collision with the support. Drive device. 2. The disk drive according to claim 1, wherein the first buffer member is a ring-shaped rubber. 3. There is at least two guide members,
Accordingly, there are two first cushioning members, one of the first cushioning members is made of ring-shaped rubber, and the other of the first cushioning members.
2. The disk drive device according to claim 1, wherein said buffer member is formed of a U-shaped elastic member in a side view. 4. The disk drive device according to claim 1, wherein said second cushioning member is formed of a rectangular parallelepiped having a mounting hole at a front center thereof. 5. The disk drive device according to claim 4, wherein an extension portion extending vertically is provided above and below the rectangular parallelepiped of the second buffer member. 6. The disk drive device according to claim 1, wherein the disk drive device is supported by a housing, and one end of the second buffer member is fixed to the housing.