JP3090168U - Bearing structure of optical pickup in disk drive - Google Patents

Abstract

(57) [Summary] [Problem] To fit a shaft part with a simple structure and to prevent it from coming off easily.
Provided is a bearing structure of an optical pickup section in a disk device in which a bearing portion can be easily formed with a mold. SOLUTION: One end of an optical pickup unit 6 having a turntable 4 and an optical system 5 for reading a disk is supported so as to be able to move up and down, and a shaft unit 13 and 14 are pivotally supported.
The drive chassis 7 is supported at three points inside the shaft portions 13 and 14.
Bearing portion 15 on the inner side of the main chassis 2 for pivotally supporting
Elastic plate members 17A, 17B arranged in a substantially V-shape having outwardly expanding and narrowing and end portions 17a, 17b opened are attached to 16 and the shaft portions 13, 14 are narrowed from the expanding portions of the elastic plate materials 17A, 17B to end portions 17a. , 17b, the narrowed ends 17a, 17b of the elastic plates 17A, 17B are pushed out and the shafts 13, 14 are pushed into the bearings 15, 16, and then the shafts 13, 13 are pressed by the pressing force of the return of the elastic plates 17A, 17B. 14 is rotatably retained and pivotally supported.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a bearing structure of an optical pickup unit in a disk device.

[0002]

[Prior art]

 In general, the bearing structure of the optical pickup unit in this type of disk drive is such that one end of an optical pickup unit having a spindle motor, a turntable that is rotationally driven by the spindle motor, and an optical system for reading a disk can move up and down. It is supported, and two places on both sides are pivotally supported by a shaft so as to be supported at three points in the main chassis.

Conventionally, for example, as shown in FIGS. 13, 14 (a), (b), 15 (a), (b)) and (c), the two shaft portions 103 on both sides described above In order to pivotally support the bearing, a bearing 101 provided in the main chassis has one end 102a integrally extended from the flat plate 101a of the bearing 101 and the other end 102a in a free state. A U-shaped arm 102 is provided, and a locking claw 104 for locking the shaft end of the shaft portion 103 is provided on the front surface of the other end portion 102a of the arm 102 so as to project forward. Is pushed into the arcuate concave portion 101b of the bearing portion 101 from above by using the bending of the arm 102 to lock the shaft end of the shaft portion 103 with the locking claw 104 of the arm 102, The shaft is locked so that it can rotate. It has become. However, in this case, the retainer, which is a vertical stopper, only locks the shaft end of the tip portion of the shaft portion 103 with the locking claw 104, so that the shaft portion 103 can easily be removed by an impact such as a drop test. There was a problem that it was easy to come off.

[0004] Japanese Patent Application Laid-Open No. 5-250686 describes a bearing structure. As shown in FIGS. 16 (a) and 16 (b), a pawl portion 202a, 202h is provided on a bearing support portion 202 of a panel chassis, and a disk playing portion corresponding to U-shaped portions 202d, 202e. By providing cylindrical rotating shaft portions 201c and 201d on the shaft portion of 201, the upper and lower, front and rear, and left and right are determined by the shape of these parts. Further, the bearing portion 201e at the boundary between the rotating shaft portions 201c and 201d is connected to the shaft. The shape escapes so that it does not touch, eliminating any rotational resistance due to burrs in this area. The shaft end of the rotating shaft portion 201c is received by the claw portion 202a of the bearing support portion 202, and the shaft end of the rotating shaft portion 201h is received by the claw portion 202h. .

Further, Japanese Patent Application Laid-Open No. 2001-110153 describes a feed mechanism of an optical pickup. As shown in FIGS. 17 (a), (b) and (a), (b), an optical disk supported by a chassis 305 in an outer casing 302 of a magneto-optical disk recording device 301 so as to be movable in a predetermined direction. A pickup 308, a lead screw 314 that rotates around the axis to move the optical pickup in a predetermined direction, and bearing members 317 and 318 mounted on the chassis 305 and rotatably supporting the lead screw are provided. The receiving members 317 and 318 are formed of a metal material, and the lead screw 314 is used as position determining means for determining the position of the optical pickup 308 with respect to the chassis 305. However, in this case, since the shaft portions of the lead screw 314 are supported by the bearing members 317 and 318, there is a problem that the lead screw 314 is difficult to be attached and removed.

Japanese Patent Application Laid-Open No. 2001-101811 discloses an optical disk device. As shown in FIGS. 19 (a) and (b), FIGS. 20 (a) and (b), FIGS. 21 (a) and (b), and FIG. 22, a turntable 452 on which the optical disc D is mounted on the chassis 451. , An optical pickup 456, and guide shafts 454, 455 for guiding the optical pickup 456 in the radial direction of the optical disc D. A nut member 464 is provided on the optical pickup 456, and the nut member 464 of the nut member 464 is engaged with the nut member 464. The lead screw 465 is arranged in parallel with the optical pickup 456, and a bearing member 473 in which one end of the lead screw 465 on the turntable 452 side is supported, and a cutout groove W5 in which the other end is inserted and supported are provided in the holder 474. In addition, the lead screw 465 is elastically moved in the length direction of the lead screw 465 by the urging force of the coil spring 478. The pressing member 475 for pressing is obtained by providing the integral molding of the pressing piece 475e having an inclined surface 475g for dividing the other end of the lead screw 465 in the direction of insertion into the notch groove W5. However, in this case, there is a problem that the structure for rotatably mounting the lead screw 465 is complicated, and it is difficult to mount and remove the lead screw 465.

[0007]

[Problems to be solved by the invention]

 The present invention solves the above-mentioned conventional problems, has a simple structure, can easily fit the shaft portion and does not easily come off, and can easily mold the bearing portion with a resin molding die. An object of the present invention is to provide a bearing structure for an optical pickup unit in a disk device.

[0008]

[Means for Solving the Problems]

 The present invention has been proposed to solve the above-mentioned problems, and the invention described in claim 1 comprises a spindle motor, a turntable driven by the spindle motor, and an optical system for reading a disk. One end of the optical pickup unit is vertically movably supported, and two positions on both sides are rotatably supported by shafts to pivotally support the two shafts of the drive chassis supported at three points in the main chassis. In the bearing structure of the main chassis, the left and right two V-shaped members are disposed in a substantially V-shape having an outwardly expanding shape and a narrow end and an open end at a bearing portion on the inner side of the main chassis on which the shaft portion is pivotally supported. An elastic plate member is attached, and the two shaft portions are narrowed from the expanding portion of the two left and right elastic plate members, and are pushed toward an end portion side to narrow the two elastic plate members. The ends are pushed out and the shafts are forcibly pushed into the bearings. After the shafts are pushed in, the shafts are rotatably stopped and pivotally supported by the pressing force due to the return of the elastic plate material. It is characterized by having been constituted so that.

According to a second aspect of the present invention, one end of an optical pickup unit having a spindle motor, a turntable rotationally driven by the spindle motor, and an optical system for reading a disk is supported so as to be movable up and down. In a bearing structure for pivotally supporting the two shaft portions of the drive chassis which are rotatably supported by the shaft portion and supported at three points in the main chassis, the main portion on which the shaft portion is pivotally supported. An elastic body is attached to a bearing portion on the inner side of the chassis to prevent the shaft portion from being pulled out when the shaft portion is fitted.

According to a third aspect of the present invention, the elastic body is composed of two left and right elastic plate members arranged in a substantially V-shape having an outwardly expanding narrow shape and an open end portion. The narrowed ends of the two elastic plate members are narrowed from the expanded portions of the two left and right elastic plate members and pushed toward the ends, and the narrowed end portions of the two elastic plate members are expanded and forcedly pushed into the bearing portions; After being pushed in, the elastic plate material is rotatably stopped and pivotally supported by the pressing force due to the return of the elastic plate material. Further, one end is fixed to the narrowed end portion of the two elastic plate materials, and the other end is the bearing. A substantially inverted U-shaped curved plate material is provided which is extended to a position close to the portion, and has a locking claw projecting from a distal end surface of the shaft portion to lock the shaft end of the shaft portion. The end of the shaft is retained by the elastic plate and Are locked so as to be prevented from falling off.

[0011] In the invention according to claim 4, the elastic body is composed of two left and right elastic plate members arranged in a substantially V shape having an outwardly expanding shape and a narrowed end portion opened, and the shaft portion is provided. The two shaft portions are narrowed from the expanded portions of the two left and right elastic plate materials and are pushed toward the end portions, and the narrowed end portions of the two elastic plate materials are pushed and expanded, so that each of the shaft portions is expanded. The shaft portion is forcibly pushed into the bearing portion, and after being pushed in, the shaft portion is rotatably stopped and pivotally supported by the pressing force due to the return of the elastic plate material, and further, the two elastic plate materials are narrowed. A vertical plate member having a locking claw protruding from the front surface is provided at a position where the shaft end of the end portion is disposed, and the shaft portion is prevented from falling off by the elastic plate material, and the shaft is locked by the locking claw of the vertical plate material. Characterized in that the ends are locked and locked I have.

[0012]

[Embodiment of the invention]

 Hereinafter, embodiments of the bearing structure of the optical pickup unit in the disk device according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a disk device provided with a bearing structure of an optical pickup unit of the present invention, FIG. 2 is a rear view of the device, and FIG. 3 shows a mechanism for vertically moving the optical pickup unit in the device. FIG. 4 is a front view, FIG. 4 shows a bearing structure of an optical pickup unit in the disk device according to the first embodiment, (a) is a perspective view of the disk drive seen diagonally from the right, and (b) is a perspective view of the disk drive seen diagonally from the left. FIG. 5 is a perspective view, and FIG. 5 shows a fitted state of a shaft portion in the same structure. FIG. 5A is a front view when the shaft portion is fitted, and FIG. 6 (a) is a plan view, FIG. 6 (b) is a front view thereof, and FIG. 6 (c) is a side view thereof.

As shown in FIGS. 1 and 2, a disk device provided with a bearing structure for an optical pickup unit according to the present invention has a hollow at a substantially central portion of a main chassis 2 disposed at a lower side of a device main body 1. A drive chassis 7 having a spindle motor (not shown), a turntable 4 rotationally driven by the spindle motor, and an optical pickup unit 6 having an optical system 5 for reading a disk is provided in the unit 3. ing. The drive chassis 7 is supported at three points in the main chassis 2. As shown in FIG. 3, a front shaft 8 is provided on the main chassis 2, and a guide plate 9 with a height difference is provided. The gear 11 which is inserted and supported in the groove 9a and attached to the shaft portion 10 of the drive motor meshes with the rack 12 of the guide plate 9, so that the drive motor rotates and guides through the gear 11 and the rack 12. The plate 9 moves left and right in the figure, and the front portion of the drive chassis 7 moves up and down by being guided by the shaft portion 8 in the guide groove 9a of the guide plate 9 having a height difference. Along with this, shaft portions 13 and 14 projecting from both left and right sides of the drive chassis 7 are rotatably supported by bearing portions 15 and 16 provided on the main chassis 2.

Thus, the drive chassis 7 has the shaft portions 13 and 14 on both left and right sides rotatably supported, and the front shaft portion 8 moves up and down in the guide groove 9 a by the left and right movement of the guide plate 9. When the optical pickup 6 is moved, the front side of the optical pickup 6 is moved up and down, and when the optical pickup 6 is moved to the upper side, the turntable 4 fixes the disk.

FIGS. 4A, 5B, 5A, 5B, 6A, 6B, and 6C show the bearing structure of the optical pickup unit in the disk device according to the first embodiment. As shown in the figure, the bearing portions 15 and 16 on the inner side of the main chassis 2 on which the left and right shaft portions 13 and 14 are pivotally supported are arranged in a substantially V-shape that is outwardly expanded and narrowed and has an open end. The left and right two elastic plate members 17A and 17B are attached, and the two shaft portions 13 and 14 are narrowed from the expanding portions of the two left and right elastic plate members 17A and 17B, and are pushed toward the end portion to be two sheets. The narrowed ends 17a, 17b of the elastic plate members 17A, 17B are pushed open, and the shaft portions 13, 14 are forcibly pushed into the downwardly arcuate concave portions 15a, 16a of the bearing portions 15, 16, and after being pushed in, the elastic plate members 17 A The shaft portions 13 and 14 are rotatably prevented from coming off by the pressing force of the narrowed ends 17a and 17b due to the return of the shaft members 17B and 17B.

Therefore, according to the bearing structure of the optical pickup unit in the disk device of the first embodiment, only the two elastic plates 17A and 17B are provided on the bearing units 15 and 16, respectively. The shaft portions 13 and 14 can be easily attached by pushing them in, respectively, and the two elastic plate members 17A and 17B can rotatably support the shaft portions 13 and 14 on both right and left sides in a rotatable state. Therefore, the left and right shaft portions 13 and 14 can be easily fitted and hardly removed with a simple structure, and the bearing portions 15 and 16 can be easily formed by a resin molding die. .

FIG. 7 is a perspective view of the bearing structure of the optical pickup unit in the disk device according to the second embodiment, viewed obliquely from the right, FIG. 8 shows the same structure, (a) is a front view thereof, and (b) is a front view thereof. FIG. 9 is a side view of the same structure, showing a fitted state of the shaft portion in the same structure, (a) is a front view when the shaft portion is fitted, and (b) is fitted in the shaft portion to prevent the shaft portion from coming off. It is a front view at the time. The same members and the same portions in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.

The bearing structure of the optical pickup unit in the desk device according to the second embodiment includes two elastic plate members as shown in FIGS. 7, 8A, 9B, and 9A and 9B. One end 18a is fixed to the narrowed ends 17a, 17b of 17A, 17B, and the other end 18b is extended to the vicinity of the bearings 15, 16, and the shaft end of the shafts 13, 14 is provided on the tip end surface 18c. A substantially inverted U-shaped curved plate member 18 having a locking claw 18d protruding therefrom is provided. When the shaft portions 13 and 14 are pushed into the two elastic plate members 17A and 17B, respectively, the locking claws 18d are pushed from above and the curved plate material 18 is pushed inward, whereby the locking claws 18d are pivoted. When the shaft ends of the portions 13 and 14 get over and are pushed downward, the curved plate material 18 is elastically restored, and its locking claws 18d are locked to the shaft ends of the shaft portions 13 and 14, and the elastic plate materials 17A and 17B In addition to the function of preventing the shaft portions 13 and 14 from coming off, there is an advantage that the shaft portions 13 and 14 are further prevented from coming off by the locking of the locking claws 18d of the curved plate material 18.

FIG. 10 is a perspective view of the bearing structure of the optical pickup unit in the disk device according to the third embodiment as viewed obliquely from the right side, and FIG. 11 shows a fitted state of the shaft unit in the same structure. FIG. 12 (b) is a front view when the shaft portion is fitted, and FIG. 12 (b) is a front view when the shaft portion is fitted to prevent the shaft portion from coming off; FIG. Is a front view thereof, and (c) is a side view thereof. The same members and the same portions in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 10, 11A, 12B, 12A, 12B, and 12C, the bearing structure of the optical pickup unit in the disk device of the third embodiment A vertical plate member 19 having a locking claw 19a protruding from the front surface is disposed at the narrow end portions 17a and 17b of the elastic plate members 17A and 17B. The shaft portions 13 and 14 are prevented from falling off by the elastic plate members 17A and 17B, and the shaft ends are locked by the locking claws 19a of the vertical plate member 19 so as to be prevented from falling off. When the shaft portions 13 and 14 are pushed into the two elastic plate members 17A and 17B, respectively, the locking claws 19a are pushed from above and the vertical plate members 19 are pushed rearward, whereby the locking claws 19a are pushed into the shaft portions. When the shaft ends of the members 13 and 14 get over and are pushed downward, the vertical plate member 19 is elastically restored, and its locking claws 19a are locked on the shaft ends of the shaft portions 13 and 14 to make the elastic plate members 17A and 17B. In addition to the function of preventing the shaft portions 13 and 14 from coming off, there is an advantage that the shaft portions 13 and 14 are further prevented from coming off by the locking of the locking claws 19a of the vertical plate member 19.

[0021]

[Effect of the invention]

 As described above, the invention according to claim 1 is characterized in that one end of an optical pickup unit having a spindle motor, a turntable rotationally driven by the spindle motor and an optical system for reading a disk is supported so as to be able to move up and down. In the bearing structure for pivotally supporting the two shaft portions of the drive chassis which are rotatably supported by the shaft portions at three points and supported in the main chassis at three points, the shaft portions are pivotally supported. The left and right two elastic plate members are attached to the bearing part on the inner side of the main chassis, which are arranged in a substantially V-shape with a flared outward shape and an open end. The two shafts are narrowed and pushed toward the end from the slab, and the narrowed ends of the two elastic plates are pushed apart and each shaft is forced into the bearing. It is, since the shaft portion is configured to be pivotally supported is retained rotatably by the pressing force due to the return of the elastic plate member after it is pushed, the effect described below.

That is, by simply providing two elastic plate members on the bearing portion, the left and right shaft portions can be easily mounted by pushing in the left and right shaft portions, and the left and right shaft portions can be rotated with the two elastic plate members. Can be pivoted in a locked state. Therefore, the left and right shaft portions can be easily fitted into each other with a simple structure and hardly come off, and the bearing portion can be easily formed by a resin molding die.

According to a second aspect of the present invention, one end of an optical pickup unit having a spindle motor, a turntable rotationally driven by the spindle motor, and an optical system for reading a disk is supported so as to be movable up and down. In a bearing structure for pivotally supporting two shaft portions of a drive chassis whose positions are pivotally supported by the shaft portions and supported in the main chassis at three points, the main chassis in which the shaft portions are pivotally supported is provided. Since the elastic member that prevents the shaft portion from coming off when the shaft portion is fitted is attached to the bearing portion on the inner side, the following effects are obtained.

In other words, by simply providing the elastic members on the bearing portions, the left and right shaft portions can be easily attached by pushing in the respective left and right shaft portions, and the left and right shaft portions can be rotatably pivoted by the elastic members in a state where they cannot be removed. Can support. Therefore, the left and right shaft portions can be easily fitted with a simple structure, and can be made hard to come off.

According to a third aspect of the present invention, the elastic body is composed of two left and right elastic plate members arranged in a substantially V-shape having an outwardly expanding shape and being narrowed and having an open end portion. The two elastic plates are narrowed from the expanded portion and pushed toward the end, and the narrowed ends of the two elastic plates are pushed apart and forcibly pushed into the bearing portion. The elastic member is rotatably stopped and pivotally supported by the pressing force generated by the return of the elastic member. Further, one end is fixed to the narrowed end portion of the two elastic plate members, and the other end is extended to a position close to the bearing portion. A substantially inverted U-shaped curved plate is provided on the distal end surface of which is provided with a locking claw for locking the shaft end of the shaft, and the shaft is prevented from falling off by an elastic plate and is bent. The locking claw locks the shaft end to prevent it from falling out. When the shafts are pushed into the two elastic plates, the locking claws are pushed inward by pushing the locking claws from above, whereby the locking claws are pushed down by the shaft ends of the shafts climbing over. Then, the curved plate material is elastically restored, and the locking claw is locked to the shaft end of the shaft portion, so that the elastic plate material prevents the shaft portion from coming off, and the locking claw of the curved plate material locks. The effect of further preventing the shaft portion from falling off can be exhibited.

According to a fourth aspect of the present invention, the elastic body is composed of two left and right elastic plate members arranged in a substantially V-shape having an outwardly expanding shape and narrowing and having an open end portion. The two shaft portions are narrowed from the spread portion of the two elastic plate members and are pushed toward the end portions, and the narrowed end portions of the two elastic plate members are pushed out and each shaft portion is forcibly applied to the bearing portion. The shaft portion is rotatably stopped and pivotally supported by the pressing force due to the return of the elastic plate material after being pushed in, and further, the shaft portion is disposed at the shaft end arrangement position of the narrowed end portion of the two elastic plate materials. A vertical plate with a locking claw protruding from the front is provided so that the shaft is prevented from falling off by the elastic plate and the shaft end is locked by the locking claw on the vertical plate to prevent it from falling off. When the shafts are pushed into the two elastic plates, the locking claws By pushing from above and pushing the vertical plate material to the rear side, when the locking claw is pushed over the shaft end of the shaft part and pushed downward, the vertical plate material elastically returns and the locking claw is In addition to the function of preventing the shaft portion from slipping off by the elastic plate material by locking to the shaft end, the effect of further locking the shaft portion by locking the locking claw of the vertical plate material can be exhibited.

[Brief description of the drawings]

FIG. 1 is a plan view of a disk device provided with a bearing structure of an optical pickup unit according to the present invention.

FIG. 2 is a rear view of the same device.

FIG. 3 is a front view showing a mechanism for vertically moving an optical pickup unit in the apparatus.

FIGS. 4A and 4B show a bearing structure of an optical pickup unit in the disk device of the first embodiment, wherein FIG. 4A is a perspective view of the disk drive seen diagonally from the right and FIG. 4B is a perspective view of the disk drive seen diagonally from the left. It is.

FIG. 5 shows a fitted state of a shaft part in the same structure,
(A) is a front view when the shaft part is fitted,
(B) is a front view when the shaft part is fitted and stopped.

6 (a) is a plan view, FIG. 6 (b) is a front view thereof, and FIG. 6 (c) is a side view thereof.

FIG. 7 is a perspective view of a bearing structure of an optical pickup unit in a disk device according to a second embodiment, viewed obliquely from the right.

8A and 8B show the same structure, wherein FIG. 8A is a front view and FIG. 8B is a side view.

FIG. 9 shows a fitted state of a shaft part in the same structure,
(A) is a front view when the shaft part is fitted,
(B) is a front view when the shaft part is fitted and stopped.

FIG. 10 is a perspective view of a bearing structure of an optical pickup unit in a disk device according to a third embodiment, viewed obliquely from the right.

FIG. 11 shows a fitted state of a shaft part in the same structure,
(A) is a front view when the shaft part is fitted,
(B) is a front view when the shaft part is fitted and stopped.

FIG. 12 shows the same structure, (a) is a plan view thereof, (b)
Is a front view thereof, and (c) is a side view thereof.

FIG. 13 is a perspective view showing a bearing structure of an optical pickup unit in a conventional disk device, viewed obliquely from the right.

FIG. 14 shows a fitted state of a shaft portion in the same structure,
(A) is a front view when the shaft part is fitted,
(B) is a front view when the shaft part is fitted and stopped.

15A and 15B show the same structure, wherein FIG. 15A is a plan view thereof and FIG.
Is a front view thereof, and (c) is a side view thereof.

16A and 16B show a conventional bearing structure, FIG. 16A is an exploded perspective view, and FIG. 16B is an assembled top view of the bearing structure.

FIG. 17A is a schematic perspective view of a magneto-optical disk recording apparatus to which a conventional optical pickup feed mechanism is applied;
FIG. 1B is a schematic plan view showing the internal structure of a conventional magneto-optical disk.

18A is a schematic bottom view showing the internal structure of a conventional magneto-optical disk, and FIG. 18B is an enlarged bottom view showing a conventional bearing member and a lead screw supported by the bearing member.

19A and 19B show a conventional optical disk device, wherein FIG. 19A is a plan view and FIG. 19B is a side view.

FIGS. 20A and 20B are a plan view and a side sectional view, respectively, showing a lead screw and a feed motor in the apparatus.

FIGS. 21 (a) and 21 (b) are side views of a holder portion of the apparatus.

FIG. 22 is an explanatory diagram for explaining an operation of a pressing piece in the same device.

[Explanation of symbols]

 2 Main chassis 4 Turntable 5 Optical system 6 Optical pickup section 7 Drive chassis 8 Shaft section 13, 14 Shaft section 15, 16 Bearing section 17A, 17B Elastic plate material 17a, 17b Narrowed end portion 18 Curved plate material 18d Locking claw 19 Vertical plate material 19a Locking claw

Claims (4)

[Utility model registration claims] An optical pickup unit having a spindle motor, a turntable rotated by the spindle motor and an optical system for reading a disk is supported at one end so as to be movable up and down, and two places on both sides are rotatable by a shaft. A bearing structure for pivotally supporting the two shaft portions of the drive chassis which is pivotally supported by the main chassis and supported at three points in the main chassis. And two left and right elastic plate members arranged in a substantially V-shape which are outwardly expanded and narrow and have open end portions are attached, and the two shaft portions are formed from the spread portions of the two left and right elastic plate members. Are pushed toward the end side, the narrowed ends of the two elastic plates are pushed apart, and the respective shaft portions are forcibly pushed into the bearing portion, and are pushed in. The bearing structure of the optical pickup unit in the disk device, wherein the shaft portion is rotatably prevented from being detached and pivotally supported by the pressing force due to the return of the elastic plate member after the rotation. 2. One end of an optical pickup section having a spindle motor, a turntable rotationally driven by the spindle motor, and an optical system for reading a disk is vertically movably supported, and two places on both sides are rotatable by a shaft section. A bearing structure for pivotally supporting the two shaft portions of the drive chassis pivotally supported by the main chassis and supported at three points in the main chassis, the bearing portion on the inner side of the main chassis in which the shaft portions are pivotally supported. A bearing structure for an optical pickup unit in the disk device, wherein an elastic body for preventing the shaft portion from coming off when the shaft portion is fitted is attached. 3. The elastic body is composed of two left and right elastic plate members arranged in a substantially V-shape with an outwardly expanding shape and a narrowed and open end portion, and the shaft portion is formed of the two left and right elastic plate members. The narrowed ends of the two elastic plate members are pushed out toward the end side by being pushed toward the end side from the expanded portion and are forcibly pushed into the bearing portion, and the elastic plate members are returned after being pushed in. It is rotatably stopped by a pressing force and is pivotally supported. Further, one end is fixed to the narrowed end portion of these two elastic plate members, and the other end is extended to a position close to the bearing portion, and A substantially inverted U-shaped curved plate material is provided on a surface of which is provided a locking claw for locking a shaft end of the shaft portion, and the shaft portion is prevented from coming off by the elastic plate material and the curved portion is formed. As the shaft end is locked by the locking claw of the plate material, it can be locked 3. A bearing structure for an optical pickup unit in a disk device according to claim 2, wherein: 4. The elastic body comprises two left and right elastic plate members arranged in a substantially V-shape having an outwardly expanding shape and being narrowed and having an open end portion, and wherein the shaft portion comprises the two left and right elastic plate members. The two shaft portions are narrowed from the expanded portion and are pushed toward the end portions, the narrowed end portions of the two elastic plate members are pushed out, and the respective shaft portions are forcibly pushed into the bearing portions. After being pushed in, the shaft portion is rotatably retained and pivotally supported by the pressing force due to the return of the elastic plate material, and furthermore, the shaft portion is located at the shaft end arrangement position of the narrowed end portion of the two elastic plate materials. A vertical plate material provided with a locking claw is provided, and the shaft portion is prevented from falling off by the elastic plate material, and a shaft end is locked by the locking claw of the vertical plate material to be locked. 3. The disk drive according to claim 2, wherein: Bearing structure of the optical pickup unit.