JP3861658B2 - Optical disk drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disc drive apparatus that improves the assembly accuracy of a moving mechanism of an optical pickup with a simple configuration.
[0002]
[Prior art]
In recent years, portable personal computers have been made thinner and smaller and lighter. The storage capacity used by these portable personal computers has increased remarkably, and a large-capacity external storage device has been required. In particular, optical recording media such as CD-Rs and DVDs have a large capacity and are easy to handle. Therefore, they tend to be used in most portable personal computers as external storage devices. Therefore, demands for thinning, miniaturization and lightening of optical recording / reproducing apparatuses used in portable personal computers are becoming stricter. These optical disk drive devices perform information writing to the recording medium disk or reading information by a pickup that moves in the radial direction of the disk that is the recording medium, so as to realize a reduction in thickness and size and weight. Therefore, it is indispensable to improve pickup performance such as reading accurate information on a recording medium and improving writing accuracy.
[0003]
A conventional optical disk drive apparatus will be described below with reference to FIG. FIG. 3 is an exploded perspective view of a traverse mechanism of a conventional optical disc drive apparatus. As shown in FIG. 3, the traverse mechanism of the optical disc drive apparatus 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 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, the encoder 12 and the pinion gear 13 are press-fitted into the traverse motor shaft 11, and 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 attached to the chassis 14 to complete the traverse mechanism.
[0004]
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, and the pickup 1 is moved along the guide shaft 15 from the inner periphery to the outer periphery of the recording medium disk. Let At that time, the encoder 12 provided on the traverse motor shaft 11 rotates, and the hole of the encoder 12 passes through the groove of the photo interrupter 16 to obtain position information in the disk radial direction of the pickup 1 and control it.
[0005]
[Problems to be solved by the invention]
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 accumulate during assembly, and it is difficult to ensure accuracy due to the accumulated errors, and adjustment man-hours are required. Yes. In order to reduce the number of parts and improve accuracy, the gear bracket 5 and the motor bracket may be integrated into a single member. However, the above-described severe thinning and downsizing problems are encountered in the optical disk drive device. Since it is imposed and there is no room for the arrangement space, it is difficult to make a single member. In addition, the number of constituent members of each assembly part has become very large, handling and assembly of the assembly part is difficult, man-hours are increased, and the complexity of the part shape is directly linked to part variation.
[0006]
Further, the traverse motor 9 has a positioning hole on the front surface. If the front surface of the traverse motor 9 is brought into contact with the reference mounting surface in the thrust direction of the gear bracket 5 and screwed using the hole, the traverse motor 9 Although it seems that the mounting accuracy is the highest accuracy, in reality, the traverse motor 9 has a thrust of the gear bracket 5 due to the variation in the tightening torque of the screw 10 and the unbalance of the tightening torque between the two screws 10. There is a problem that 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. Or in the worst case, the traverse motor 9 itself is destroyed, Also it occurs a problem deformation of the motor shaft 11.
[0007]
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 accuracy of the chassis 14 and the gear bracket 5, the tightening torque accuracy of the screws 10, and the accuracy of the assembly jig Although it is necessary to increase the accuracy as much as possible, the accuracy can be increased, but the inspection management cost increases, the unit price of the gear bracket 5 increases, thorough torque management of the screw tightening machine, the increase in the number of man-hours, the difficulty of jig manufacture Problems such as high speed and high accuracy occur.
[0008]
Therefore, the present invention can be reliably and easily assembled with few parts, can improve the assembly accuracy of the pickup parts, can stabilize the movement of the pickup, can reduce the assembly man-hours, and can manage the parts. An object of the present invention is to provide an optical disk drive device that is easy and can reduce management costs.
[0009]
[Means for Solving the Problems]
In the optical disk drive device of the present invention, a traverse motor, a traverse unit, and a screw shaft are mounted with their axial directions aligned on a chassis formed with a reference surface for each, and the traverse motor is configured to receive a motor by a leaf spring member. The chassis is fixed to the chassis by being pressed against the reference surface. The chassis is provided with three reference surfaces for receiving the motor and a hook for attaching the leaf spring member, and the leaf spring member is engaged with the hook. A plurality of side surface pressing ribs and an axial direction pressing rib that press the side surface of the traverse motor, and the traverse motor is mounted on the chassis and sandwiched between leaf spring members so that the side surface pressing rib and the axial direction rib The pressing rib is biased toward each reference surface and is positioned and fixed.
Further, in the optical disk drive device of the present invention, the traverse motor, the traverse unit, and the screw shaft are mounted with their axial directions aligned on the chassis on which the reference surfaces are formed, and the traverse motor is mounted on the motor receiver by the leaf spring member. The chassis is fixed to the chassis by being pressed against the reference surface, and the chassis is provided with an attachment portion for attaching the leaf spring member. The leaf spring member includes an engagement portion that engages with the attachment portion, and a traverse. and the pressing portion is provided for pressing the outer surface of the motor from the side surface and axially, by the traverse motor is clamped by the plate spring member is mounted to the chassis, pressing portion toward the respective reference surface of the chassis It is characterized by being biased and positioned and fixed.
[0010]
This ensures reliable and simple assembly with a small number of parts, improves the assembly accuracy of the pickup parts, stabilizes the movement of the pickup, reduces the number of assembly steps, and facilitates parts management. Management costs can also be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, a screw shaft for moving the pickup unit in the radial direction of the recording medium disk, a traverse motor for driving the screw shaft, and a trailer for transmitting power between the traverse motor and the screw shaft. A traverse motor, a traverse unit, and a screw shaft are mounted on a chassis in which a reference surface for each is formed, aligned in the axial direction, and the traverse motor is mounted on a reference surface for receiving a motor by a leaf spring member. It is fixed to the chassis by being pressed , and the chassis is provided with three reference surfaces for receiving the motor and a hook for attaching the leaf spring member, and the leaf spring member has a hook hole that engages with the hook. And multiple sides to press the side of the traverse motor Pressure ribs and axial pressing ribs are provided, and the traverse motor is mounted on the chassis and sandwiched between the leaf spring members, so that the side pressing ribs and the axial pressing ribs are biased toward the respective reference surfaces. Since the optical disk drive device is characterized by positioning and fixing , the traverse motor, traverse unit, and screw shaft can be aligned in parallel in the chassis alone, and the traverse motor can be positioned and fixed only by the leaf spring member. Therefore, it is possible to easily and reliably position with a small number of parts, and to provide a pickup moving mechanism with stable operation. The assembly accuracy of the parallelism of the traverse motor, the traverse unit, and the screw shaft is improved, and the assembly man-hours can be reduced without variations in the assembly.
Furthermore, the axial direction of the traverse motor, traverse unit, and screw shaft can be aligned only by the chassis, and only by mounting the leaf spring member, the hook is pressed against the reference surface in the height direction of the traverse motor, The side is pressed evenly with a plurality of side pressing ribs, and the rear part of the traverse motor is pressed with the axial pressing ribs, so that it can be positioned on each of the three reference planes so that the screw shaft and traverse motor can be easily and reliably It can be mounted and can be a pickup moving mechanism with stable movement. The accuracy of the parallelism of the traverse motor, the traverse unit and the screw shaft is improved, the assembly man-hour can be reduced, the parts management is easy, and the management cost can be reduced.
[0012]
According to a second aspect of the present invention, there is provided a screw shaft that moves the pickup unit in the radial direction of the recording medium disk, a traverse motor that drives the screw shaft, and a trailer that transmits power between the traverse motor and the screw shaft. A traverse motor, a traverse unit, and a screw shaft are mounted on a chassis in which a reference surface for each is formed, aligned in the axial direction, and the traverse motor is mounted on a reference surface for receiving a motor by a leaf spring member. is fixed to the chassis by being pressed, the chassis is provided with a mounting portion for mounting the plate spring member, the leaf spring member, and the engaging portion that engages with the mounting portion, the outer surface of the traverse motor and the pressing portion is provided for pressing from the side axially, DOO Since the berth motor is mounted on the chassis and is clamped by the leaf spring member, the pressing portion is urged toward each reference surface of the chassis to be positioned and fixed. The axial direction of the motor, traverse unit, and screw shaft can be aligned in parallel only by the chassis, and the traverse motor is positioned and fixed only by the leaf spring member, so it can be positioned easily and reliably with few parts and stable operation. The pickup moving mechanism can be used. The assembly accuracy of the parallelism of the traverse motor, the traverse unit, and the screw shaft is improved, and the assembly man-hours can be reduced without variations in the assembly.
Further, the axial direction of the traverse motor, traverse unit and screw shaft can be aligned only by the chassis, and only by mounting the leaf spring member, the mounting portion presses against the reference surface in the height direction of the traverse motor, Since the outer shell surface of the motor is pressed by the pressing portion from the side surface direction and the axial direction so that it can be respectively positioned on the reference surface of the chassis, the screw shaft and the traverse motor can be easily and securely attached to the reference surface, and the stable movement pickup It can be a moving mechanism. The accuracy of the parallelism of the traverse motor, the traverse unit and the screw shaft is improved, the assembly man-hour can be reduced, the parts management is easy, and the management cost can be reduced.
[0013]
(Embodiment 1)
1A is a plan view of the optical disc apparatus according to Embodiment 1 of the present invention, FIG. 1B is a plan view of the optical disc apparatus of FIG. 1A with the leaf spring member removed, and FIG. 2A is FIG. FIG. 2B is a cross - sectional view taken along the line B-B showing the attachment of the traverse motor shown in FIG. 2B, and FIG. 2B is a cross - sectional view taken along the line AA showing the attachment of the traverse motor shown in FIG. Configuration for moving the pick-up unit 118 of the first embodiment is similar to the conventional pickup unit 18 described above. That is, the driving force of the traverse motor 109 is transmitted using the shaft gear 104, the traverse motor 109, the pinion gear 113, and the screw shaft 103, and moved along the two guide shafts 115 from the inner periphery to the outer periphery of the recording medium. The position information of the pickup 101 is obtained from the information from the encoder 112 using the photo interrupter 116. Detailed description is omitted.
[0014]
By the way, the pickup unit 118 of the first embodiment is configured by attaching a rack 102 to the pickup 101. The screw shaft unit 119 for moving the pickup unit 118 is obtained by press-fitting a shaft gear 104 into a screw shaft 103 having a spiral groove. The gear unit 123 is obtained by press-fitting an encoder 112 and a pinion gear 113 into a traverse motor shaft 111 of the traverse motor 109.
[0015]
How the leaf spring member 117 is used to fix the chassis to the chassis will be described. As shown in FIG. 2A, in the first embodiment, the chassis 114 is provided with a hook 114a, and the leaf spring member 117 is provided with a hook hole 117a. The traverse motor 109 is attached to the chassis 114 simply by hooking the hook 114a into the hook hole 117a. At this time, the lateral direction, the axial direction, and the height direction of the traverse motor 109 are biased by the side pressing rib 117b whose positioning shape is matched to the arcuate outer shape of the traverse motor 109 and the rear end surface of the traverse motor 109. The axial direction pressing rib 117c, the hook 114a and the hook 117a are used. The side pressing ribs 117b are provided at two front and rear portions in parallel with the axis of the traverse motor 109, whereby an equal urging force can be applied, and high parallelism between the traverse motor 109 and the screw shaft 103 can be maintained. . Further, a rib that forms a reference surface that receives the front portion of the traverse motor 109 is provided on the chassis 114, 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.
[0016]
That is, as shown in FIGS. 2A and 2B, by attaching the leaf spring member 117 to the hook 114a, the plurality of side surface pressing ribs 117b uniformly press the side surface of the traverse motor 109, and the axial direction pressing is performed. The rib 117c presses the back surface of the traverse motor 109 against the chassis 114. The traverse motor 109 is pressed against the motor receiving reference surface formed on the chassis 114 by the component force of the pressing force by the side pressing rib 117b, and the directions of the traverse motor 109 and the screw shaft 103 can be aligned. Similarly, in the motor shaft direction, it is positioned by being pressed against the motor receiving reference surface by the axial pressing rib 117c. Of course, the positioning of the traverse motor 109 in the height direction is sandwiched and fixed by the leaf spring member 117 itself by engaging the hook hole 117a and the hook 114a.
[0017]
By the way, the traverse unit 122 is configured by press-fitting the train shaft 107 into the gear bracket 105, inserting the train gear 108, and further inserting the screw shaft unit 119. When 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 and the traverse motor 109 is fixed by the action of the leaf spring member 117 in this state, the traverse motor The unit 122 and the gear unit 123 are assembled in parallel with the chassis 114 in the same direction. That is, the traverse motor shaft 111, the train shaft 107, and the screw shaft unit 119 are all assembled by one leaf spring member 117 on the basis of the chassis 114, and the parallelism of all the shafts can be realized. An accurate pickup feeding mechanism can be realized.
[0018]
【The invention's effect】
As described above, according to the present invention, it is possible to improve the assembly accuracy of the parallelism of all the main parts of the pickup moving mechanism by simply assembling the chassis and the leaf spring member, and to stabilize the movement of the pickup. Can be achieved, and the number of assembling steps can be reduced. In addition, management of parts is sufficient for management of chassis only, and management costs can be reduced.
[Brief description of the drawings]
FIG. 1A is a plan view of an optical disc apparatus according to Embodiment 1 of the present invention. FIG. 1B is a plan view with a leaf spring member removed of the optical disc apparatus of FIG. FIG. 3B is a cross-sectional view taken along the line AA showing the mounting of the traverse motor of FIG. 1B. FIG. 3B is an exploded perspective view of the traverse mechanism of the conventional optical disc drive apparatus. Explanation of]
DESCRIPTION OF SYMBOLS 1,101 Pickup 2,102 Rack 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 Screw 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

Claims (2)

A screw shaft that moves the pickup unit in the radial direction of the recording medium disk; and
A traverse motor for driving the screw shaft;
A traverse unit that transmits power between the traverse motor and the screw shaft;
The traverse motor, the traverse unit, and the screw shaft are mounted with their axial directions aligned on a chassis in which a reference surface for each is formed,
The traverse motor is fixed to the chassis by being pressed against a reference surface for receiving the motor by a leaf spring member,
The chassis is provided with three reference surfaces for receiving the motor and a hook for attaching the leaf spring member. The leaf spring member has a hook hole that engages with the hook and a side surface of the traverse motor. A plurality of side pressing ribs and axial pressing ribs are provided,
The traverse motor is mounted on the chassis and sandwiched between the leaf spring members, whereby the side pressing ribs and the axial pressing ribs are urged toward the respective reference surfaces to be positioned and fixed. Optical disc drive device to be used. A screw shaft that moves the pickup unit in the radial direction of the recording medium disk; and
A traverse motor for driving the screw shaft;
A traverse unit that transmits power between the traverse motor and the screw shaft;
The traverse motor, the traverse unit, and the screw shaft are respectively mounted on a chassis in which a reference surface is formed with the axial direction aligned,
The traverse motor is fixed to the chassis by being pressed against a reference surface for receiving the motor by a leaf spring member,
The chassis, the mounting portion for mounting the plate spring member is provided on the plate spring member, and the engaging portion that engages the mounting portion, lateral and axially outer surface of the traverse motor is provided with a pressing portion for pressing the,
The optical disk drive device, wherein the traverse motor is mounted on the chassis and clamped by the leaf spring member, so that the pressing portion is urged toward each reference surface of the chassis to be positioned and fixed. .

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