JPH08306174A - Disk device - Google Patents

Abstract

PURPOSE: To make a device thin in structure and to isolate the vibrations of a drive unit in a disk device in which the drive unit for recording/reproducing information to/from a disk medium to be loaded is attached to main body case. CONSTITUTION: The specified number of insulators 63 provided when the drive unit is attached to the main body case are provided in a driving unit constituting a part of the drive unit installed in a disk device, and the specified number of projecting pieces 67 as buffer parts are radially formed in portions opposed to the bottom of the main body case in the insulators 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device in which a drive unit for recording / reproducing information on / from a mounted disk medium is mounted in a body case.

[0002]

2. Description of the Related Art In recent years, FD (floppy disk) and C have been used as disk media as recording media.
D (Compact disc), LD (Laser disc),
MO (magneto-optical disk) and MD (mini disk) have been generalized, and disk devices using these are generally required to be thin. Further, there is a write-once type of CD, and a disk device for driving the CD is also required to be thin, and it is desired that the wiring process for that be facilitated in a small space.

Here, FIG. 8 shows an exploded structural view of a conventional disk device. FIG. 8 shows a write-once optical disc (hereinafter referred to as C
A disk device 11 for driving a D.R) is shown. In the disk device 11, a printed circuit board 13 for control is arranged in a lower part of a main body case 12, and a drive unit 14 is arranged on the printed circuit board 13. The cover 15 is attached.

A front bezel 21 is attached to the front surface of the main body case 12, and an opening / closing insertion opening 22 and an eject button 23 are provided in the front bezel 21 and an eject hole 2 for manually ejecting.
4 are provided. The drive unit 14 is the drive unit 2
5, a slider 26, and a disc holder 27. A disc case 29 for accommodating the CD-R 28 is inserted into the disc holder 27, and a shutter 29a of the disc case 29 slides when the disc case 29 is inserted.
Show part of 28.

The drive unit 25 includes an optical head 3 on the chassis 31.
2 is attached, and the optical head 32 is guided in the radial direction of the CD-R 28 to be inserted into the guide rods 33a and 33b.
A head drive mechanism (32a, 32b) configured by, for example, a linear motor that moves along the track, an eject motor 26a that ejects the disk case 29 by sliding the slider 26, an eject mechanism including a gear 26b, and the like are provided.

In this case, electrical connection to the head drive mechanisms 32a and 32b for driving the movable optical head 32 is performed from both guide rods 33a and 33b side via a flexible printed board (FPC) 34a, and
The electrical connection of the signal processing system between the optical head 32 and the printed circuit board 13 is performed via the FPC 34b.

The slider 26 is for raising and lowering the disc holder 27, and has cam guides 35a, 35b having tapered grooves on cam plates 35 on both sides (one side is not shown) in the disc case insertion direction. Formed,
Correspondingly, it engages with a predetermined number of protrusions 36a, 36b formed on both side surfaces of the disc holder 27. Further, the disc holder 27 is provided with a turning lever 37 for sliding a shutter 29a of the disc case 29 when the disc case 29 is inserted.

In such a drive unit 14, when the disc holder 27 is not inserted into the disc case 29, the disc holder 27 is positioned above, and when the disc case 29 is inserted into the disc holder 27, the loading mechanism ( Slider 26 (not shown)
Slides forward (in the direction opposite to the disc case insertion direction), the disc holder 27 descends and enters the recording / reproducing state.

Then, the optical head 32 makes the disk medium 28
Information is recorded / reproduced by being moved and positioned by the head drive mechanisms 32a and 32b in the radial direction. Further, the disk case 29 (disk medium 28) is taken out by pushing the eject button 23 to rotate the eject motor 26a and slide the slider 26 in the depth direction.

Reference numeral 27a is a guide member for guiding the disc holder 27 when it is moved up and down, and 38 is an eject lever for manually moving the slider 26 in the depth direction to take out the disc case 27. Here, FIG.
8 shows a schematic bottom view of the drive unit shown in FIG. Figure 9
In FIG. 8, as shown in FIG.
Head drive mechanism (linear motor) 32, 32 on both sides of
b is provided and the FPC 34 for energizing this
a extends from the bottom side and is electrically connected to the printed circuit board 13. The optical head 32 is connected to the printed circuit board 13 via the FPC 34b for transmitting / receiving a signal for recording / reproducing.

By the way, on the back surface of the chassis 31 of the drive unit 25, insulators 39a and 39b formed of elastic members such as rubber are provided on both sides in the depth direction. The insulators 39a and 39b are interposed between the insulators 39a and 39b when they are attached to the attachment member of the main body case 12 so that the drive unit 14 is in a floating state. It is provided in order to reduce the vibration to the drive unit 14 between the members.

[0012]

However, the drive unit 14 is mounted on the printed circuit board 13 of the main body case 12, and when the device is made thin, the clearance below the drive unit 14 becomes small and vibration occurs. When the insulators 39a and 39b are bent, the chassis 31 of the drive unit 25 of the drive unit 14 comes into direct contact with the printed circuit board 13. On the other hand, if the hardness of the insulators 39a and 39b is increased, the vibration damping characteristics are limited and the There is a problem that the shaking effect is weakened.

Further, if the clearance below the drive unit 14 is increased, it is effective against vibration, but there is a problem that the device cannot be made thin. Therefore, the present invention has been made in view of the above problems,
It is an object of the present invention to provide a disk device which is designed to be thin and to prevent vibration of a drive unit.

[0014]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, there is provided a disk device in which a drive unit for recording / reproducing information on / from a disk medium to be mounted / dismounted is attached to a main body case. A disk device in which a predetermined number of elastic members are interposed between the main body case and the bottom surface of the main body case in a non-contact manner, and a buffer portion is provided in a portion of the elastic member facing the bottom surface of the main body case. Is configured.

According to a second aspect of the present invention, in the cushioning portion of the elastic member according to the first aspect, a predetermined number of projecting pieces are formed on the bottom surface side of the main body case with respect to the bottom surface position of the drive unit. In the third aspect, a predetermined number of the protruding pieces according to the second aspect are formed in a radial or annular shape.

According to a fourth aspect, the buffer portion of the elastic member according to the first aspect is formed by extending the elastic member from the bottom surface position of the drive unit to the bottom surface side of the main body case. According to a fifth aspect, the buffer portion of the elastic member according to the first aspect is attached as a member having an elastic coefficient different from that of the elastic member on the bottom surface side of the main body case from the bottom surface position of the drive unit.

[0017]

As described above, according to the first aspect of the present invention, the elastic member interposed between the main body case and the drive unit to be attached is provided with the buffer portion on the bottom surface side of the main body case.
This makes it possible to prevent vibration when the drive unit vibrates due to external vibration when the device is made thin, and to prevent unpleasant noise when the buffer unit comes into contact with the main body case.

According to the second, third or fifth aspect of the present invention, the buffer portion provided on the elastic member is formed by forming a predetermined number of projecting pieces in a radial or annular shape as appropriate, or by attaching members having different elastic coefficients. To do. This makes it possible to appropriately adjust the elastic force by using a protruding piece or a member having a different elastic coefficient, efficiently absorbing vibrations, and forming a radial or annular shape in that portion. It is possible to perform uniform vibration absorption of

According to the fourth aspect of the invention, the cushioning portion provided on the elastic member extends the elastic member. This allows
It is possible to prevent generation of unpleasant sound when the drive unit comes into contact with the main body case due to vibration.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of an embodiment of the present invention.
FIG. 1 is a perspective view of a drive unit 42 of a drive unit included in the disk device 41 of the present invention.
In FIG. 1, the drive unit 42 includes a spindle 44 provided with a spindle motor (not shown) for rotating a disk medium (described in FIG. 5) housed in a disk case in a resin chassis 43, for example. The chucking portion 44a attached to the tip of the is exposed and provided. Further, an optical head 45 for performing recording / reproducing with respect to the disk medium is provided, and the optical head 45 has guide rods 46a,
It is guided by 46b so as to be movable in the radial direction of the disk medium.

A rack 47 is provided on the optical head 45 and meshes with a gear 48. The gear 48 is integrated with a worm wheel 48a which meshes with a worm 49a provided on a rotation shaft of a carrier motor 49. . That is, as the carrier motor 49 rotates, the optical head 45 moves via the worm 49a, the worm wheel 48a, the gear 48, and the rack 47.

Further, an eject motor 50 is provided in the chassis 43, and the worm 5 provided on the rotating shaft of the eject motor 50.
0a meshes with the main gear 51 via a predetermined number of gears, and a cam 51a is formed on the main gear 51.
This cam 51a engages with a locking piece of a slider described later,
This is for sliding the slider in the depth direction by the rotation of the eject motor 50. A detection switch 52 for detecting the position of the cam 51a is provided near the cam 51a.

Further, a relay printed board 53, which is a relay board, is arranged on one side of the chassis 43. Electronic components such as a pickup amplifier 54 that amplifies a reproduction signal of the optical head 45 are mounted on the relay printed circuit board 53, and at least five connectors 55 _{1 to} 55 ₅ for connecting cords are mounted.

Then, the spindle motor (spindle 4
4 position (below 4) for rotating the disk medium.
Connector via flexible printed board (FPC) 56
55 ₁Connected to the optical head 45 for recording and reproduction.
Connector 55 through the FPC 57 for₂Connected to.

The carrier motor 49 and the eject motor 50 are connected to the connector 55 ₃ via the cord 58, and the detection switch 52 is connected to the connector 53 ₄ via the cord 59. From the relay printed circuit board 53, a connector 55 ₅ is connected to a main printed circuit board, which is a control board described later, through an FPC (or flat cable) 60.

In this way, the electrical wiring inside the chassis 43 of the drive unit 42 is concentrated on the relay printed circuit board 53, and the connection from the relay printed circuit board 53 to the main printed circuit board is made only by the FPC 60. A damper 61 is provided near one corner in the chassis 43, and the damper 61 is provided with a gear 61a. The gear 61a meshes with a rack formed on the slider, which will be described later, and buffers the sliding speed of the slider. The chassis 4 near the damper 61
An elevating guide member 62 is provided on the back wall of the disc 3, and the elevating guide member 62 is loosely fitted in a hole formed in a disc holder described later to guide the elevating and lowering of the disc holder.

Hollow insulators 63, which are elastic members, are provided at the four corners of the chassis 43 (described in FIG. 2). This insulator 63
Is attached to a mounting member (boss) of a predetermined height that is integrally provided upright at four corners in the main body case, which will be described later, in the hollow and is arranged in the main body case. At this time, the chassis 43 does not come into contact with the bottom surface of the main body case and is in a floating state, and plays a role of buffering the vertical vibration of the drive unit 53.

In the vicinity of each of the insulators 63, horizontal insulators 64 made of, for example, a rubber elastic member are further provided, and a long hole is formed in the horizontal direction. In the hole of the horizontal insulator 64, a rod member (boss) having a predetermined height which is integrally erected with the main body case in the vicinity of a mounting member of the main body case, which will be described later, is loosely fitted, and a horizontal vibration of the drive unit is generated. Plays a buffering role against.

A predetermined number of locking pieces 65 are formed on both sides of the chassis 43 in the outward direction (described later). here,
FIG. 2 shows a block diagram of the insulator of FIG. Figure 2
FIG. 2A is a vertical sectional view, and FIG. 2B is a bottom view.
The insulator 63 shown in FIGS. 2A and 2B is made of rubber or the like in a hollow shape.
The lower side shown in (A) is the main body case side described later. In the insulator 63, a curved portion 66c is formed in a plane circular shape from a fixed portion 66b in which a hole 66a is formed in an upper portion, and two flange portions 66d ₁ , below the curved portion 66c.
A mounting groove 66d is formed by 66d ₂ . A hole (not shown in the figure) formed in the bottom surface of the chassis 43 of the drive unit 42 is fitted and mounted in the mounting groove 66d.

As shown in FIG. 2B, a predetermined number (six in the figure) of protruding pieces 67 as a buffer portion are radially formed on the bottom surface of the mounting groove 66d. Each of the projecting pieces 67 is formed integrally with the insulator body by the same member, and is bent when it comes into contact with a body case described later. That is, by using the projecting piece 67, the elastic force is reduced as compared with the insulator main body, and the shock absorption is effective.

Further, by forming the projecting pieces 67 in a radial shape, the melting of the insulator 63 is made uniform. For example, even if the insulator 63 tilts and comes into contact with the main body case, another projecting piece 67 is formed. Even in the case of, it is possible to absorb vibration by contact.

In this case, the vibration to the extent that the drive unit does not come into contact with the main body case is absorbed by the bending portion 66c. Subsequently, FIG. 3 shows an exploded configuration diagram of a disk device including the drive unit of FIG. FIG. 3 shows, as the disc device 41, a device for recording and reproducing information on, for example, a write-once optical disc (disc medium). In FIG. 3, the disk device 41
Are roughly divided into a main body case 71, a drive unit 72,
It is composed of a main printed circuit board 73 which is a control board and a cover 74. The disk medium used is housed in the disk case 75 and mounted in the drive unit 72. Further, the stopper member 76 is used as a separate body.

The main body case 71 is formed in a box shape by, for example, aluminum die casting, and the inside thereof is the above-mentioned mounting member (boss) 81 and rod member (boss) for mounting the drive unit 72, the printed circuit board 73, and the stopper member 76. ) 82 etc. are integrally formed. Further, the front bezel 83 is attached to an open portion which is the front of the main body case 71. Front bezel 83 is disk case 75
Opening / closing insertion opening 84 for ejecting and attaching the eject button 85
Is provided, and an eject hole 86 is provided directly below the opening / closing insertion opening 84 in the substantially central portion.

The eject button 85 is used to automatically take out the mounted disk case 75 by an eject mechanism using the eject motor 50, and the eject hole 86 is inserted with a shaft or the like for sliding a slider described later. This is for manually taking out the disk case 75 which cannot be taken out automatically when the motor fails or the power supply is stopped.

Further, the front bezel 83 is appropriately provided with an indicator light, a volume, a horn terminal and the like. In addition,
The main body case 71 is provided with a printed circuit board (not shown) on the back surface of the front bezel 83 on which electrical components such as the eject button 85 are mounted. The drive unit 72 is
The drive unit 42 is roughly divided into a drive unit 42 shown in FIG. 1, a slider 91 which is an elevating means, and a disk holder 92 which is a holding means (described in FIG. 4), and is first mounted in the main body case 71. At this time, the drive unit 72
A stopper member 76 is arranged behind the. The stopper member 76 is attached to the disc holder 92 and the disc case 75.
This is to prevent the drive unit 72 from moving rearward when the disc is inserted, and to reduce the stroke of the disc holder 92 when moving up and down.

The main printed circuit board 73 is a part for performing signal processing for driving and recording / reproducing each mechanism of the drive unit 72, and a printed circuit board for the drive unit 72 and the above-described front bezel 83, corresponding connectors and the like. Thus, the electrical connection is made with a flat cable or the like, and the host side and a predetermined number of connectors 93 are electrically connected. The printed circuit board 73 is arranged above the drive unit 72 of the main body case 71.

Then, the main body case 71 is covered by the cover 74.
By covering the device, it is possible to prevent dust and the like from entering the device. Further, FIG. 4 shows an exploded configuration diagram of the drive unit shown in FIG. As shown in FIG. 4, the drive unit 72
Is a drive unit 42, a slider 91 as an elevating means,
It is composed of a disc holder 92 which is a holding means.
The drive unit 42 has the configuration shown in FIG.

The slider 91 provided on the drive unit 42 has two cam pieces 101a and 101b on one side.
The cam plate 101 is formed, and the cam piece 101
The a and 101b are formed with a horizontal portion that guides a guide portion of a disc holder 92, which will be described later, to move the disc holder 92 up and down, and a taper portion having a downward slope. Also, the cam piece 1
In addition to the taper portion, a taper portion for pressing a predetermined guide portion described later when the disk holder 92 is at the lower position is formed on 01b.

On the other side, three cam pieces 102a-1
The cam plate 102 of 02c is formed, and the cam 1
02a and 102b are provided with a horizontal portion for guiding a guide portion of a disc holder 92 described later and a taper portion having a downward inclination, and the cam piece 102c is provided with a disc holder 92 described later.
A downwardly sloping taper portion is formed to hold a predetermined guide portion of the disk holder 92 at a position below the disk holder 92.

Furthermore, the cam plate 10 of the slider 91
A rack 103 is formed on one rear side of 1 and meshes with a gear 61 a on a damper 61 of the drive unit 42. Further, the eject hole 86 of the front bezel 83 shown in FIG.
A locking portion 104 for manual ejection formed by cut-and-raising is formed at a position corresponding to, and a cam 51a on the main gear 51 of the drive unit 42 is provided near the rear substantially in the center. A locking portion 105 that engages is formed.

This locking portion 105 is a disk case 75.
The main gear 51 is rotated by the rotation of the eject motor 50 to be engaged with the cam 51a at the time of ejecting, so that the slider 91 is slid backward (backward) and the disc holder 72 is raised. These sliders 91 are integrally formed of a single metal plate member.

Subsequently, the disc holder 92 provided on the slider 91 has a holding portion 111 for holding the disc case 75 at least on both sides formed of a metal plate member, for opening and closing the shutter of the disc case 75. A loading mechanism (not shown) for attaching and detaching the disk case 75 including the lever 112 and the like is provided.

Guide portions 113 corresponding to the cam pieces 101a, 101b, 102a to 102c of the cam plates 101, 102 of the slider 91 are formed on both side surfaces of the disc holder 92. In FIG. Guide portions 113a to 113c corresponding to the cam pieces 101a and 101b of 101 (the same applies to the guide portion on the opposite surface).

A predetermined number of locking portions 114 are provided on the upper portions of both side surfaces of the disc holder 92 so as to correspond to the locking portions 65 of the drive unit 42. That is, when the drive unit 42, the slider 91, and the disk holder 94 are combined together, the respective locking pieces 114 and the locking portions 65 thereof.
Spring springs 115 are respectively suspended between and to urge the disc holder 92 toward the drive unit 42 side.

A guide hole 116 is formed behind the disc holder 92. The lift guide member 62 of the drive unit 42 is loosely fitted in the guide hole 116 to guide the lift of the disk holder 92. Next, FIG.
FIG. 1 shows a block diagram of the disk case used in the present invention. FIG. 5A is a plan view and FIG. 5B is a bottom view.
A disc case 75 shown in FIGS. 5A and 5B accommodates, for example, a write-once disc medium (optical disc) 121, and an opening 122 for exposing a partial area in the radial direction of the disc medium 121. Is formed, and this opening 12
The shutter 2 can be opened and closed by a shutter 123. The shutter 123 is slidable in the direction perpendicular to the insertion direction of the disc case 75, and its tip portion 123a.
However, when it is inserted into the disc holder 64, it is slid by the lever 112 so that the opening 122 is exposed.

Here, the write-once type disk medium 121 is
It is an optical disc that can record information only once, and allows the user to record and reproduce various information such as video information and code information. Video file system, document file system, computer file system, ultra large capacity library It is used in systems and the like. In this disk medium 121, a signal is recorded with a mark of a predetermined shape by the presence or absence (drilling) of a reflection film, deformation (bulge, etc.), and refractive index (reflectance) change in a heat mode by heating laser light, and a laser light spot Is emitted to detect the change in the reflected diffracted light with a strong and weak signal to reproduce.

Next, FIG. 6 shows an explanatory view of the insulator for the main body case of the drive unit. Figure 6
In (A), the insulator 63 is fitted into the holes 42a for insulators formed at the four corners of the drive unit 42 of the drive unit 72 by its mounting groove 66d. Then, the mounting member (boss) 81 formed on the main body case 71 is inserted into the hollow of the insulator 63, and the tip end thereof is brought into contact with the fixed portion 66b and tightened and fixed by the screw 68 from the outside of the insulator 63.

These are fixed in the four corners of the drive unit 42 in the main body case 71, and the bottom surface of the drive unit 72 (drive unit 42) is positioned in a floating state without contacting the bottom surface of the main body case 71. Then, the disk device 11
When vibration is generated in the vertical direction of, as shown in FIG.
The drive unit 72 vibrates greatly in the vertical direction and bends when the projecting piece 67 of the insulator 63 comes into contact with the bottom surface of the main body case 71, and the elastic force thereof relaxes the impact on the drive unit 72.

As a result, even if the disk medium 121 is vibrated at the time of writing only once, the insulator 63 is generated.
Since the (protrusion 67) effectively absorbs the vibration, it is possible to prevent the writing from becoming unusable without causing a writing error. That is, even if the clearance below the drive unit 72 is reduced according to the thinning of the device, safety is ensured and the clearance can be effectively used. Further, even if the vibration of the drive unit 72 causes an overstroke, the protrusion 67 can prevent an unpleasant contact sound with the main body case 71.

Next, FIG. 7 shows a block diagram of another insulator of the present invention. In FIG. 7A, a predetermined number of projecting pieces 67a are formed in a ring shape (in FIG. 7A, one instead of the projecting pieces 67 radially formed on the bottom surface of the insulator 63 as a buffer portion. A plurality of pieces may be formed), and the same operational effect as that of the protruding piece 67 is shown.

In FIG. 7B, the insulator body (fixed portion 67) is provided on the bottom surface of the insulator 63 as a buffer portion.
b, the curved portion 66c, the mounting groove 66d) and an elastic member 66b having a different elastic coefficient (for example, a small elastic coefficient) are attached by an adhesive agent or the like, and the same operational effect as the protruding pieces 67, 67a. Have.

In FIG. 7C, an extension portion 67c is formed as a cushioning portion, which is a protruding piece extending below the insulator body to the bottom surface side of the body case 71. The extension portion 67c is formed. Although the anti-vibration property is limited by the elastic coefficient of the constituent material of the insulator 63, it is possible to prevent an unpleasant contact sound when the drive unit 72 overstrokes during anti-vibration.

[0053]

As described above, according to the first aspect of the present invention, the elastic member interposed between the main body case and the attached drive unit is provided with the buffer portion on the bottom surface side of the main body case. When the drive unit vibrates due to external vibration, the shock absorbing portion absorbs the vibration, and it is possible to prevent the generation of unpleasant noise when the shock absorbing portion comes into contact with the main body case.

According to the second, third or fifth aspect of the present invention, the buffer portion provided on the elastic member is formed in a predetermined number of radial or annular projecting pieces, or members having different elastic coefficients are attached. With this configuration, it is possible to appropriately adjust the elastic force by using the projecting piece or a member having a different elastic coefficient, to efficiently absorb the vibration, and to make the radial or annular shape. It is possible to perform uniform vibration absorption in that portion.

According to the fourth aspect of the present invention, the cushioning portion provided on the elastic member is extended to prevent the generation of unpleasant sound when the drive unit is brought into contact with the main body case due to vibration. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of the insulator of FIG.

3 is an overall exploded configuration diagram of a disk device including the drive unit of FIG.

FIG. 4 is an exploded configuration diagram of the drive unit of FIG.

FIG. 5 is a configuration diagram of a disk case used in the present invention.

FIG. 6 is an explanatory diagram of an insulator for the main body case of the drive unit.

FIG. 7 is a configuration diagram of another insulator of the present invention.

FIG. 8 is an exploded configuration diagram of a conventional disk device.

9 is a schematic bottom view of the drive unit shown in FIG.

[Explanation of reference numerals] 41 disk device 42 drive unit 43 chassis 44 spindle 45 optical head 49 carrier motor 50 eject motor 53 relay printed circuit board 56, 57, 60 FPC 63 insulator 67, 67a to 67c projecting piece 71 body case 72 drive unit 73 Main printed circuit board 74 Cover 75 Disk case 76 Stopper member 83 Front bezel 91 Slider 92 Disholder 111 Holding part 113 Guide part 121 Disk medium

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoru Sanabe 1601 Sakai, Atsugi-shi, Kanagawa Prefecture, Atsugi Plant, Mitsumi Electric Co., Ltd. ) Inventor Kazutomo Imi 1601 Sakai, Atsugi-shi, Kanagawa Mitsumi Electric Co., Ltd. Atsugi Plant

Claims (5)

[Claims] 1. A disc device in which a drive unit for recording / reproducing information on / from a disc medium to be mounted / dismounted is attached to a main body case, wherein the drive unit has a predetermined number of elastic members interposed between the drive unit and the main body case. A disk device, which is attached to a bottom surface of a main body case in a non-contact state, and a buffer portion is provided at a portion of the elastic member facing the bottom surface of the main body case. 2. The disk device according to claim 1, wherein the cushioning portion of the elastic member is formed with a predetermined number of projecting pieces on a bottom surface side of the main body case from a bottom surface position of the drive unit. 3. A disk device, wherein a predetermined number of the protruding pieces according to claim 2 are formed radially or annularly. 4. The disk device according to claim 1, wherein the buffer portion of the elastic member is formed by extending the elastic member from a bottom surface position of the drive unit to a bottom surface side of the main body case. 5. The cushioning portion of the elastic member according to claim 1, is attached to the bottom surface side of the main body case from a bottom surface position of the drive unit as a member having an elastic coefficient different from that of the elastic member. Disk device.