JPH11339459A - Optical disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thin a base chassis and surely fix the base chassis without deforming the base chassis by forming the base chassis of a sheet metal. SOLUTION: A mount element 14 having a plurality of mount holes 15 is formed bending to a base chassis 5 of a sheet metal which holds a motor and an optical pickup. A plurality of mount stages 17 are provided on a supporting member 2, each having a bearing surface 20 on which a circumferential edge of the mount hole 15 of the mount element 14 butts, a first stepped projection 21 and a second stepped projection 22. A fitting screw 16 is clamped to the mount stage 17, thereby compressing an elastic washer 19 and fixing the mount element 14 to the bearing surface 20. In this case, a projection height (d) of the second stepped projection 22 is set to be smaller than a sum (b) of a thickness (a) of the mount element 14 and a thickness of the elastic washer. Accordingly, even if a clamping force of the screw 16 is too strong, the base chassis 5 is prevented from being deformed and can be surely fixed to the supporting member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, a CD-R
The present invention relates to optical disk devices such as / RW and DVD.

[0002]

2. Description of the Related Art Hitherto, there has been an optical disc apparatus in which information is written on an optical disc or information written on the optical disc is reproduced by irradiating the optical disc with light from a light source by an optical pickup. In this optical disk device, since it is necessary to accurately determine the relative position between the rotation axis of the motor that rotates the optical disk and the optical pickup, the motor and the optical pickup are mounted on a single base chassis to form a unit as a pickup module. There is one that is attached to a support member with an attachment screw.

[0003] Such an optical disk device is often used by being incorporated in a personal computer, but when used in a personal computer, particularly when used in a notebook-type personal computer, there is a strong demand for a thinner optical disk device. For this reason, if the base chassis on which the optical pickup and the motor are mounted is formed by die casting, the thickness increases, so that a base chassis made of sheet metal has been considered. In this case, a structure in which the base chassis is integrally provided with a mounting piece bent to be mounted on the support member by mounting screws is preferable in terms of manufacturing, such as reducing the number of parts and the manufacturing process.

[0004]

By the way, when the mounting piece of the base chassis made of sheet metal is formed by bending, relatively high rigidity can be obtained even if the sheet metal material is thin. However, it is very difficult to form the periphery of the plurality of mounting holes into which the mounting screws are inserted, on the same plane. Thus, when the mounting screw inserted into the mounting hole of the mounting piece is screwed into the support member with a strong force, the mounting piece can be brought into close contact with the support member and the base chassis can be firmly fixed. If it is not flat,
The stress generated when the periphery of the mounting hole is brought into close contact with the supporting member by the tightening force of the mounting screw causes distortion in the base chassis, which deforms the base chassis. The degree of parallelism with the optical axis of the optical disk is deviated, and the light irradiated on the optical disk cannot be reflected in a desired direction, which has a problem of adversely affecting the recording and reproduction of information.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical disk device that can be made thinner and can accurately maintain a relative position between a motor and an optical pickup.

[0006]

According to the first aspect of the present invention,
In an optical disc apparatus, a pickup module comprising a motor for rotating an optical disc and an optical pickup opposed to the optical disc fixed to a base chassis made of sheet metal is attached to a support member by a plurality of attachment screws. A bending piece having a plurality of mounting holes into which screws are inserted and formed integrally with the mounting screw, wherein the mounting screws have a flexible elastic washer for elastically pressing the mounting pieces toward the support member; Are mated,
The support member has a seat surface with which a peripheral edge of the mounting hole of the mounting piece abuts, a first stepped protrusion protruding from the seat surface and fitted into the mounting hole, A second stepped projection projecting from the center of the stepped projection and fitted to the inner periphery of the elastic washer; and the mounting screw formed from one end of the second stepped projection is provided with a screw. A plurality of mounting bases having screw holes to be combined with each other, and a protruding height from the seat surface to an end surface of the second stepped projection is a sum of a thickness of the mounting piece and a thickness of the elastic washer. It is set to a lower value than the value.

Accordingly, the mounting hole of the mounting piece is fitted to the first stepped projection, the inner peripheral surface of the elastic washer is fitted to the second stepped projection, and the mounting screw is screwed to the mounting base. Then, the mounting piece and the elastic washer are clamped between the seating surface of the mounting base and the head of the mounting screw. In this case, even if the tightening force of the mounting screw is too strong, the distance between the head and the seat surface of the mounting screw is maintained at a constant value, so that no excessive pressure acts on the mounting piece. Also,
Since the elastic washer is clamped between the mounting piece and the head of the mounting screw and compressed, the movement of the mounting piece can be fixed by the pressure at the time of compression.

According to a second aspect of the present invention, in the first aspect of the present invention, the mounting pieces are divided into a plurality of pieces and are arranged at predetermined intervals.

Therefore, it is possible to separate a portion between adjacent mounting holes in the base chassis from the supporting member. Thereby, it becomes easy to make the peripheral surfaces of the mounting holes coincide with each other on the same plane during manufacturing.

According to a third aspect of the present invention, in the first or second aspect of the invention, the elastic washer is previously fitted to the mounting screw.

Accordingly, it is possible to eliminate the trouble of fitting the elastic washer to the mounting screw every time the mounting screw is inserted into the mounting hole and screwed into the mounting base.

[0012]

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a loading base. The loading base 1 forms a housing of the optical disk device together with a top cover (not shown) assembled on an upper portion thereof. 2 is loading base 1
A sub-chassis as a support member to be assembled in the sub-chassis. 3 is a pickup module attached to the sub-chassis 2.

The pickup module 3 is unitized by assembling a substrate 4, a base chassis 5, and a cover 6, as shown in FIG. A motor 7 for rotating an optical disk (not shown) is provided on the substrate 4, and the motor 7 is supported by the base chassis 5 via the substrate 4. That is, the board 4 is fixed to the base chassis 5 by screwing a screw 8 passed through the board 4 to a bush 9 made of synthetic resin fitted into the base chassis 5. Further, an optical pickup 10 (see FIG. 1) is slidably supported on the base chassis 5 in a direction orthogonal to the rotation axis of the motor 7. The cover 6 concealing the periphery of the motor 7 and the optical pickup 10 has a plurality of elastic pieces 11, 12 bent on its side elastically fitted to the side of the base chassis 5, and a screw 13 passed through the cover 6. Is attached to the base chassis 5 by being screwed into the base chassis 5.

Further, on the periphery of the base chassis 5, a mounting piece 14 is divided into a plurality (three pieces) and bent. The divided mounting piece 14 is formed with a C-shaped mounting hole 15 partially cut away. As shown in FIG.
A plurality of (three) mounting bases 17 for mounting the base chassis 5 with mounting screws 16 are fixedly provided on the sub-chassis 2. In the present embodiment, these mounts 17 are formed by erected studs formed by cutting a metal bar. However, the present invention is not limited to such a structure, and is formed integrally with the sub-chassis 2. May be. A plurality of (three) mounting screws 16 are provided with washers 18.
An elastic washer 19 made of an elastic material such as rubber is fitted in advance.

As shown in FIG. 4, the mounting table 17 has a seating surface 20 against which the peripheral edge of the mounting hole 15 of the mounting piece 14 abuts.
And the mounting hole 1 of the mounting piece 14 protruding from the seat surface 20.
5 and a second stepped projection projecting from the center of the first stepped projection 21 and fitted to the inner peripheral surface of the elastic washer 19. 22 are formed. FIG. 4A illustrates a state in which the elastic washer 19 is detached from the mounting screw 16 in order to show the relationship between the mounting base 17 and the elastic washer 19 before being compressed.

Here, the thickness of the mounting piece 14 is a,
4 is the sum of the thickness a of the elastic washer 19 and the thickness a of the elastic washer 19,
The projection height of the first step projection 21 from the seat surface 20 is c, and the projection height from the seat surface 20 to the end surface of the second step projection 22 is d.
Then, it is determined that a> c and b> d. Further, the mounting table 17 has a screw hole 2 into which the mounting screw 16 is screwed.
3 (see FIG. 3) is formed from one end of the second stepped projection 22.

In such a configuration, as shown in FIG. 4A, the first stepped projection 21 and the mounting hole 1 of the mounting piece 14 are formed.
5 and the inner periphery of the elastic washer 19 and the second stepped protrusion 22 are fitted. When the mounting screw 16 is not screwed to the mounting base 17, the upper surface of the mounting piece 14 is the first stepped projection 2.
The upper surface of the elastic washer 19 which is positioned higher than the upper surface of the first and the mounting piece 14 is positioned higher than the upper surface of the second stepped projection 22.

In this state, as shown in FIGS. 3 and 4 (b), the mounting screw 16 is screwed into the screw hole 23 (see FIG. 4) of the mounting base 17 until the washer 18 contacts the end face of the second stepped projection 22. 3), the elastic washer 19 is compressed by the difference between b and d, and the mounting piece 14 is pressed by the pressure generated by the compression.
Press against 0. In this state, the mounting piece 14 and the elastic washer 19 are clamped between the seating surface 20 of the mounting base 17 and the head 16a of the mounting screw 16. The washer 18 may be omitted if the outer diameter of the head 16 a of the mounting screw 16 is large enough to press the elastic washer 19.

In such a mounting state, even if the tightening force of the mounting screw 16 is too strong, the head 16a of the mounting screw 16
Since the distance from zero is maintained at a constant value, no excessive pressure acts on the mounting piece 14. Accordingly, deformation of the base chassis 5 due to distortion can be prevented, and accordingly, the relative position between the optical disk driven by the motor 7 and the optical pickup 10 can be accurately maintained.
Further, since the elastic washer 19 is sandwiched between the mounting piece 14 and the head 16a of the mounting screw 16 and compressed, the movement of the mounting piece 14 can be reliably fixed by the pressure at the time of compression.

The first stepped projection 21 from the seat surface 20
May be equal to or slightly larger than the thickness a of the mounting piece 14. Even in this case, the elastic washer 19
Is compressed, and the mounting piece 14 is pressed against the seating surface 20 by the pressure to fix the base chassis 5. In this case, if c is too large with respect to a, it may be difficult for the washer 18 or the head 16a of the mounting screw 16 to flatly press the upper surface of the elastic washer 19, as shown in FIG. By maintaining the relationship of a> c, a and c
The tolerance of the dimensional difference from the above can be increased, which is advantageous in manufacturing.

Further, instead of dividing the mounting piece 14 into a plurality of pieces, the mounting piece 14 may be continuously formed in a flange shape over the entire peripheral edge of the base chassis 5, and a plurality of mounting holes 15 may be formed in this one mounting piece. However, in the present embodiment, since the mounting pieces 14 are divided into a plurality of parts and are arranged at predetermined intervals, a portion between the adjacent mounting holes 15 in the base chassis 5 is Can be separated. This makes it easy to reduce the area of the mounting piece 14 and make the peripheral surfaces of the mounting holes 15 coincide with each other on the same plane.

Further, the elastic washer 19 is attached to the mounting screw 16.
The mounting screw 16 is attached to the mounting hole 15 in advance.
Each time it is inserted into the mounting base 17 and screwed into the mounting base 17, the trouble of fitting the elastic washer 19 to the mounting screw 16 can be eliminated.

[0023]

According to the first aspect of the present invention, a sheet metal base chassis for holding a motor and an optical pickup has a plurality of mounting holes into which mounting screws are inserted, and a mounting piece integrally bent and formed. A bendable elastic washer that elastically presses the mounting piece toward the support member is fitted to the mounting screw, and the supporting member to which the base chassis is mounted is brought into contact with the periphery of the mounting hole in the mounting piece. A seating surface, a first stepped protruding portion projected from the seating surface and fitted into the mounting hole,
A plurality of mounting bases having a second stepped protrusion projecting from the center of the first stepped protrusion and fitted to the inner periphery of the elastic washer, and a screw hole into which a mounting screw is screwed. Since the projection height from the seat surface to the end surface of the second step projection is set to a value lower than the total value of the thickness of the mounting piece and the thickness of the elastic washer, tightening of the mounting screw is performed. Even if the force is too strong, the distance between the head of the mounting screw and the seat surface is maintained at a constant value, so that deformation of the base chassis can be prevented and the relative position between the motor and the optical pickup can be accurately maintained. . Further, since the elastic washer is clamped between the mounting piece and the head of the mounting screw and compressed, the pressure at the time of compression can securely fix the base chassis to the support member.

According to a second aspect of the present invention, in the first aspect of the present invention, the mounting pieces are divided into a plurality of pieces, each of which is arranged at a predetermined interval, so that a space between adjacent mounting holes in the base chassis is provided. The part can be separated from the support member. Thereby, it becomes easy to make the peripheral surfaces of the mounting holes coincide with each other on the same plane during manufacturing.

According to a third aspect of the present invention, in the first or second aspect of the present invention, since the elastic washer is previously fitted to the mounting screw, the mounting screw is inserted into the mounting hole and screwed to the mounting base. Each time, the trouble of fitting the elastic washer to the mounting screw can be eliminated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an attachment relationship between a pickup module and a support member according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view illustrating a configuration of a pickup module.

FIG. 3 is a cross-sectional view showing a mounting state of a mounting piece of a base chassis to a mounting base.

4A is a cross-sectional view showing a dimensional relationship among a mounting piece, an elastic washer, and a mounting base, and FIG. 4B is a cross-sectional view showing a mounting state of a mounting piece of a base chassis to the mounting base.

[Explanation of symbols]

 Reference Signs List 2 support member 3 pickup module 5 base chassis 7 motor 10 optical pickup 14 mounting piece 15 mounting hole 16 mounting screw 17 mounting base 19 elastic washer 20 seating surface 21 first stepped projection 22 second stepped projection 23 screw Hole b Total value of the thickness of the mounting piece and the thickness of the elastic washer d Projection height from the seat surface to the end surface of the second stepped projection

Claims (3)

[Claims] 1. An optical disk device, comprising: a motor for rotating an optical disk; and a pickup module in which an optical pickup facing the optical disk is fixed to a base chassis made of sheet metal. The pickup module is mounted on a supporting member by a plurality of mounting screws. The base chassis has a plurality of mounting pieces having a plurality of mounting holes into which the mounting screws are inserted, and the mounting pieces are formed integrally with the mounting screws, and the mounting screws have a flexure for elastically pressing the mounting pieces toward the support member. A flexible elastic washer is fitted, and the support member has a seat surface with which a peripheral edge of the mounting hole of the mounting piece abuts, and a first member protruded from the seat surface and fitted into the mounting hole. A stepped projection, a second stepped projection projected from the center of the first stepped projection and fitted to the inner periphery of the elastic washer, and a second stepped projection. Shape from one end A plurality of mounting bases having screw holes into which the mounting screws are screwed, and the height of the projection from the seat surface to the end surface of the second stepped protrusion is determined by the thickness of the mounting piece and the thickness of the mounting piece. An optical disc device characterized by being set to a value lower than the total value of the thickness of the elastic washer. 2. The optical disk device according to claim 1, wherein the mounting pieces are divided into a plurality of pieces and are arranged at predetermined intervals. 3. The optical disk device according to claim 1, wherein the elastic washer is fitted in the mounting screw in advance.