JP2003141828A - Optical disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk drive which is assembled reliably and easily with fewer parts, and in which the assembling accuracy of pickup components are improved, the movement of the pickup is stabilized and assembly work improvement is realized, parts are easily managed and management cost is reduced. SOLUTION: In the optical disk drive, a traverse motor 109, a traverse unit 122 and a screw shaft 103 are mounted on a chassis 114 on which a reference surface is formed to position each component by aligning its direction. The traverse motor 109 is fixed to the chassis 114 by being pressed by the leaf spring member 117 to the reference surface for a motor receptacle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive device for improving the assembly accuracy of a moving mechanism of an optical pickup with a simple structure.

[0002]

2. Description of the Related Art In recent years, portable personal computers have been made thinner, smaller and lighter. The storage capacity used by these portable personal computers has significantly increased, and a large-capacity external storage device has been required. Among them, since optical recording media such as CD-R and DVD have a large capacity and are easy to handle, they tend to be used in the majority of portable personal computers as external storage devices. Therefore, demands for thinner, smaller and lighter optical recording / reproducing devices used in portable personal computers are becoming more severe. In addition, these optical disk drive devices write information to or read information from a recording medium disk by a pickup that moves in the radial direction of the disk, which is the recording medium, to realize thinning, size reduction and weight reduction. It is essential to improve pickup performance such as accurate reading of information from a recording medium and improvement of writing accuracy.

A conventional optical disk drive device will be described below with reference to FIG. FIG. 3 is an exploded perspective view of a traverse mechanism of a conventional optical disk drive device. As shown in FIG. 3, the traverse mechanism of the optical disk drive device is assembled by combining a plurality of units described below. First, the pickup unit 18 is assembled by attaching the rack 2 to the pickup 1. The screw shaft unit 19 for moving the pickup unit 18 is made by press-fitting the shaft gear 4 into the screw shaft 3 having a spiral groove.
Next, the bracket unit 20 for transmitting the rotation to the screw shaft unit 19 is configured by press-fitting the train shaft 7 into the gear bracket 5. The motor unit 21 serving as a drive source is assembled from the bracket unit 20, the train gear 8 inserted into the train shaft 7 of the bracket unit 20, and the traverse motor 9. The traverse motor 9 is fixed to the gear bracket 5 with two screws 10, and the traverse motor shaft 11 includes an encoder 12 and a pinion gear 13.
Is press-fitted and is further assembled to the bracket unit 20 via the train gear 8. Next, the screw shaft unit 19 is inserted into the gear bracket 5 of the motor unit 21, the traverse unit 22 is assembled, and the traverse unit 22 is further attached to the chassis 1.
The traverse mechanism is completed by attaching to No. 4.

The driving force of the traverse motor 9 is transmitted from the pinion gear 13 to the train gear 8 and from the screw shaft unit 19 to the rack 2, so that the pickup 1 is moved from the inner circumference to the outer circumference of the recording medium disk and the guide shaft 15 is moved. Move along. At that time, the encoder 12 provided on the traverse motor shaft 11 rotates, and the hole of this encoder 12 passes through the groove of the photo interrupter 16 to obtain and control the position information of the pickup 1 in the disk radial direction.

[0005]

As described above,
Since the traverse mechanism of the conventional optical disk drive device has a large number of parts, assembly errors of individual parts are accumulated during assembly, and it is difficult to ensure accuracy due to this accumulated error, and adjustment man-hours are required. Further, in order to reduce the number of parts and improve accuracy, it is conceivable that the gear bracket 5 and the motor bracket are integrated into one member, but the optical disk drive device has the above-mentioned problems of severe thinning and miniaturization. Since it is imposed and there is no room in the arrangement space, it is difficult to integrate it into one member. In addition, the number of constituent members of each assembly component is increasing, handling and assembling of the assembly component is difficult, the man-hour is increased, and the complicated shape of the component is directly connected to the variation of the component.

Further, the traverse motor 9 has a positioning hole on the front surface, and if the hole is used and the front surface of the traverse motor 9 is brought into contact with the mounting reference surface of the gear bracket 5 in the thrust direction and screwed, the traverse motor 9 is screwed. It seems that the mounting accuracy of the motor 9 is the highest, but in reality, the traverse motor 9 is mounted on the gear bracket due to the variation in the tightening torque of the screw 10 and the imbalance of the tightening torque between the two screws 10. 5 is attached at an angle with respect to the reference plane in the thrust direction, the clearance between the pinion gear 13 and the train gear 8 varies, the load for moving the pickup 1 is not stable, and the pickup 1 cannot move at a predetermined voltage. A problem may occur, or in the worst case, the traverse motor 9 itself may be damaged. Also arises a problem deformation of the traverse motor shaft 11.

Therefore, in order to solve these problems while maintaining the performance of the moving mechanism of the pickup 1 of the optical disk drive device, the precision of the chassis 14 and the gear bracket 5, the precision of the tightening torque of the screw 10, and the assembly cure. It is necessary to make the accuracy of the tool as high as possible, but while the accuracy can be increased, the inspection management cost increases, and
The unit price of the product will increase, and problems such as thorough torque management of the screw tightener, increased man-hours, difficulty in manufacturing jigs and higher accuracy will occur.

Therefore, according to the present invention, the small number of parts can be surely and easily assembled, the assembling accuracy of the pickup parts can be improved, the movement of the pickup can be stabilized, and the number of assembling steps can be reduced. An object of the present invention is to provide an optical disk drive device in which parts management is easy and management costs can be reduced.

[0009]

According to an optical disk drive device of the present invention, a traverse motor, a traverse unit and a screw shaft are mounted in a chassis in which reference planes for the traverse motor are formed so as to be aligned in the axial direction. It is characterized in that it is fixed to the chassis by being pressed against the reference surface for receiving the motor by the leaf spring member.

As a result, the small number of parts can be assembled reliably and easily, the assembling accuracy of the pick-up parts can be improved, the movement of the pick-up can be stabilized, and the number of assembling steps can be reduced, and the parts can be managed. It is easy and management cost can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a screw shaft for moving a pickup unit in a radial direction of a recording medium disc, a traverse motor for driving the screw shaft, and a traverse motor and a screw shaft. A traverse unit for transmitting power between the traverse motor, traverse unit, and screw shaft are mounted in a chassis in which reference planes for the traverse motor are aligned in the axial direction. Since the optical disc drive device is characterized in that it is fixed to the chassis by being pressed against the reference surface for receiving, it is possible to align the traverse motor, the traverse unit, and the screw shaft in parallel only in the chassis. Can and traverse Since fixed positioning over data performed by only the plate spring member, can be easily and reliably positioned with few parts, it can be a moving mechanism of the pickup of stable operation. The accuracy of assembling the parallelism of the traverse motor, the traverse unit, and the screw shaft is improved, and the assembly man-hours can be reduced without variation in assembly.

According to a second aspect of the present invention, the chassis is provided with three reference surfaces for receiving the motor and hooks for attaching the leaf spring member, and the leaf spring member is provided with hooks. There are provided hook holes to be engaged, four side surface pressing ribs for pressing the side surface of the traverse motor, and an axial pressing rib. The traverse motor is mounted on the chassis and is sandwiched by the leaf spring members, so that the side surface pressing ribs are provided. 2. The optical disc drive device according to claim 1, wherein the axial pressing rib and the axial pressing rib are biased toward the respective reference planes to position and fix the optical disk drive device. It can be aligned only with the chassis, and by mounting the leaf spring member, it is pressed by the hook against the reference plane in the height direction of the traverse motor. The side surface of the traverse motor is evenly pressed by the plurality of side surface pressing ribs, and the rear part of the traverse motor is pressed by the axial direction pressing ribs, whereby the three reference surfaces can be positioned respectively, and the screw shaft and traverse motor can be easily and reliably The pickup can be mounted on the reference surface and can be a stable movement mechanism for the pickup. The accuracy of the parallelism of the traverse motor, traverse unit and screw shaft is improved, the number of assembly steps can be reduced, parts management is easy, and management costs can be reduced.

(First Embodiment) FIG. 1A is a plan view of an optical disk device according to the first embodiment of the present invention.
2B is a plan view of the optical disk device of FIG. 1A with the leaf spring member removed, FIG. 2A is a cross-sectional view taken along the line AA showing the attachment of the traverse motor of FIG. 1A, and FIG. Figure 1 (b)
FIG. 6 is a BB cross-sectional view showing the attachment of the traverse motor of FIG. The structure for moving the pickup unit 118 according to the first embodiment is the same as that of the conventional pickup unit 18 described above. That is, the traverse motor 109
Drive force of the shaft gear 104, traverse motor 10
9, the pinion gear 113 and the screw shaft 103 are used for transmission, and the photo interrupter 11 is moved along the two guide shafts 115 from the inner circumference to the outer circumference.
6, the position information of the pickup 101 is obtained from the information from the encoder 112. Detailed description is omitted.

By the way, the pickup unit 118 according to the first embodiment includes the pickup 101 and the rack 102.
It is configured by attaching. This pickup unit 1
Screw shaft unit 119 for moving 18
Is a screw shaft 103 having a spiral groove.
The shaft gear 104 is press-fitted in. The gear unit 123 has a traverse motor shaft 111 of the traverse motor 109 in which an encoder 112 and a pinion gear 113 are press-fitted.

How the plate spring member 117 is used to fix the chassis will be described.
As shown in FIG. 2A, in the first embodiment, the chassis 1
14 to the hook 114a, and the leaf spring member 117 to the hook hole 1
17a is provided. This hook 114a is hook hole 1
The traverse motor 109 is attached to the chassis 114 simply by hooking it on the 17a. At this time, positioning of the traverse motor 109 in the lateral direction, axial direction, and height direction is performed by
A side surface pressing rib 117b having a positioning shape that matches the arcuate outer shape of the traverse motor 109 and an axial pressing rib 117c that urges the rear end surface of the traverse motor 109.
And the hook 114a and the hook 117a. The side surface pressing rib 117b is used for the traverse motor 10
Two front and rear portions are provided in parallel to the axis of 9, so that a uniform biasing force can be applied and high parallelism between the traverse motor 109 and the screw shaft 103 can be maintained. Further, the chassis 114 is provided with a rib forming a reference surface for receiving the front surface portion of the traverse motor 109, and the rear portion of the traverse motor 109 is pressed against the axial pressing rib 117c (reference surface). Also in the height direction, a mounting reference surface is provided on the chassis 114, and is clamped and fixed by the hook 114a and the hook 117a.

That is, as shown in FIGS. 2A and 2B, by mounting the leaf spring member 117 on the hook 114a, the plurality of side surface pressing ribs 117b uniformly press the side surface of the traverse motor 109, Axial pressing rib 117
c presses the back surface of the traverse motor 109 against the chassis 114. The traverse motor 109 presses the traverse motor 109 against the motor receiving reference surface formed on the chassis 114 by the component of the pressing force by the side surface pressing rib 117b.
9 and the screw shaft 103 can be aligned in the same direction. Similarly, in the motor axial direction, the axial pressing rib 117
It is pressed against the motor receiving reference surface by c and positioned. Of course, the positioning of the traverse motor 109 in the height direction is pinched and fixed by the leaf spring member 117 itself engaging with the hook hole 117a and the hook 114a.

By the way, the traverse unit 122 is
The train shaft 107 is press-fitted into the gear bracket 105, the train gear 108 is inserted, and the screw shaft unit 119 is further inserted. The gear bracket 105 and the screw shaft 103 are inserted into a mounting positioning hole (reference surface) (not shown) provided in the chassis 114. In this state, when the traverse motor 109 is fixed by the action of the leaf spring member 117, the traverse motor Unit 122 and gear unit 123 are chassis 1
It is assembled in parallel with 14 in the same direction. That is,
Traverse motor shaft 111 and train shaft 1
07 and the screw shaft unit 119 are mounted on the chassis 114 by one leaf spring member 117.
Since it is assembled according to the standard, the parallelism of all shafts can be realized, and a highly accurate pickup feed mechanism can be realized.

[0018]

As described above, according to the present invention, by simply assembling only the chassis and the leaf spring member, it is possible to improve the assembling precision of the parallelism of all the main parts of the moving mechanism of the pickup. Stabilize the movement of
Moreover, the number of assembling steps can be reduced. In addition, parts management only requires management of the chassis, and management costs can be reduced.

[Brief description of drawings]

1A is a plan view of an optical disk device according to a first embodiment of the present invention, and FIG. 1B is a plan view of the optical disk device of FIG. 1A with a leaf spring member removed.

2A is a cross-sectional view taken along the line AA showing the installation of the traverse motor shown in FIG. 1A, and FIG. 2B is a cross-sectional view taken along the line BB showing the installation of the traverse motor shown in FIG. 1B.

FIG. 3 is an exploded perspective view of a traverse mechanism of a conventional optical disk drive device.

[Explanation of symbols]

1, 101 pickup 2,102 racks 3,103 screw shaft 4,104 shaft gear 5,105 Gear bracket 7,107 Train shaft 8,108 Train gear 9,109 traverse motor 10 screws 11,111 traverse motor shaft 12,112 encoder 13,113 pinion gear 14,114 chassis 18,118 Pickup unit 19,119 Screw shaft unit 20, 120 Bracket unit 21,121 Motor unit 22,122 Traverse unit 114a hook 115 Guide shaft 16,116 Photo interrupter 117 leaf spring member 117a hook hole 117b Side pressing rib 117c Axial pressing rib 123 gear unit

Continued front page    F term (reference) 5D068 AA02 BB01 CC03 EE17 GG05                       GG24                 5D117 AA02 JJ01 JJ02

Claims (2)

[Claims] 1. A screw shaft for moving a pickup unit in a radial direction of a recording medium disc, a traverse motor for driving the screw shaft, and a traverse unit for transmitting power between the traverse motor and the screw shaft. The traverse motor, the traverse unit, and the screw shaft are mounted in a chassis in which reference planes for the traverse motors are aligned in the axial direction, and the traverse motor is a reference plane for receiving a motor by a leaf spring member. An optical disk drive device, which is fixed to the chassis by being pressed. 2. A chassis for receiving a motor is provided on the chassis.
One reference surface and a hook for attaching the leaf spring member are provided, and the leaf spring member has a hook hole that engages with the hook and a plurality of side surface pressing ribs that press a side surface of the traverse motor and an axial direction. A pressing rib is provided, and the traverse motor is mounted on the chassis and sandwiched by the leaf spring member, so that the side surface pressing rib and the axial pressing rib are biased toward their respective reference surfaces. Positioning and fixing are carried out.
The optical disk drive device described.