KR19990034220U - Optical Skew Control - Google Patents

Abstract

The present invention relates to a skew adjusting device for optical pickup, in particular radial skew and tangential skew to improve the accuracy of the inclined angle of the optical disk information surface and the laser beam axis of the pick-up unit in a mechanism state according to a high speed and high density tendency. Is a skew adjusting device for optical pickup, which is intended to provide convenience of adjustment by adjusting the screw by a screw, and is installed on the power transmission device 10 and the upper surface of the power transmission device 10 to reproduce the optical recording medium. And a pickup base 1 for fixing the turntable 20 for recording and the pick-up section 21; A cover (2) for protecting the pickup (21); First and second elastic pieces (2a) (2b) installed on the cover (2) to elastically support the tangential skew and the radial skew adjustment; A yoke portion 30 for seating the pick-up portion 21; First and second adjustment holes 30a and 30b formed in the yoke portion 30; A frame 40 for fixing the suspension wires; It consists of a fixing member (8) for fixing the frame 40 and the yoke portion (30).

Description

Optical Skew Control

The present invention relates to a skew adjusting device for optical pickup, and in particular, the skew adjustment mechanism of high speed and high density (DVD), that is, the precision due to the convenience of radial skew and tangential skew adjustment And a skew adjusting device for optical pickup to improve productivity.

A configuration of a general optical recording medium is described below with reference to FIGS. 1A and 1B.

On the pickup base 1, a turntable 20 and a pickup section 21 for reproducing and recording the power transmission device 10 and the optical recording medium are provided, and the pickup section is protected to protect the pickup section 21. The cover 2 is provided on 21.

An elastic piece 2a and an adjusting screw 70 are formed on the cover 2 to adjust the tangential skew, and a yoke part for seating and rotating the power transmission device 10 and the turntable 20 includes: 30); A frame 40 for fixing the suspension wires; It consists of a fixing screw 50 for fixing the frame 40 and the yoke (yoke) (30).

On the other hand, the adjustment groove 41 for inserting the adjusting rod 60 for adjusting the radial skew is cut in one end of the frame 40 as shown in FIG.

In the optical recording medium configured as described above, the power transmission device 10, the turntable 20, the yoke portion 30, the frame 40, etc. are assembled to the pickup base 1, and then the skew adjustment is performed. Usually, after tangential skew adjustment, it proceeds in the order of radial skew adjustment.

First, the yoke portion 30, which is a reference, is adjusted while moving downward, and the radial skew is inserted into the adjustment groove 41 protruding from the frame 40, and then rotated to the left and right about the Y axis. The adjustment is made by moving up and down, and after the adjustment is completed, fix it with adhesive.

However, in such an optical recording medium, the accuracy of the inclined angle of the information surface of the optical recording medium and the laser beam axis of the pickup portion becomes very important in the mechanism state due to the tendency of high speed and high density. Because of the use, there is a problem that the accuracy of adjustment is inferior to that of screw adjustment.

In addition, after the adjustment is finished, if the adjustment rod is pulled out by the reaction force to go back to the original state there was a problem that takes a lot of time as the adjustment becomes unstable.

Also, after the adjustment is completed, the adjustment groove may be misaligned by touching the adjustment groove protruding to the outside of the frame when removing the adjustment rod.

In addition, there was a problem in that the adjustment jig is much more complicated and expensive.

The present invention solves the above-mentioned drawbacks, and the radial skew and tangential skew can be improved in order to improve the accuracy of the inclined angle of the optical recording medium information surface and the laser beam axis of the pick-up section under the mechanism of high speed and density. By adjusting the screw to adjust the way to provide the convenience of the adjustment.

In order to achieve the above object, the present invention provides a power transmission device, and a pickup base for fixing a turntable and a pickup unit for reproducing and recording an optical recording medium provided on an upper surface of the power transmission device; A cover for protecting the pickup; First and second elastic pieces installed on the cover to elastically support the tangential skew and the radial skew adjustment; A yoke portion for seating the pick-up portion; First and second adjustment holes formed in the yoke portion; A frame for fixing the suspension wires; Characterized in that the fixing member for fixing the frame and the yoke.

Further, the first adjustment member for adjusting the tangential skew is provided in the first adjustment hole formed in the yoke portion, and the second adjustment member for adjusting the radial skew is provided in the second adjustment hole.

1A and 1B are views showing a part of a pickup base of a conventional optical record carrier, FIG.

Figure 3a, 3b is a view showing a part of the pickup base of the optical recording medium of the present invention;

4 is an enlarged side view of the main part of part B of FIG. 3A;

5 is a front sectional view of the present invention pickup base,

<Description of Symbols for Major Parts of Drawings>

1: pickup base 2: cover

2a: first elastic piece 2b: second elastic piece

10: power train 20: turntable

21: pickup portion 30: yoke portion

30a: first adjusting hole 30b: second adjusting hole

40 frame 70 first adjusting member

71: second adjusting member 80: fixing member

81: fitting

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, the same names and shapes as in the prior art are given the same reference numerals and description thereof will be omitted.

The present invention is described with reference to FIG. 3A or 3B, a turntable 20 and a pickup 21 for reproducing and recording the power transmission device 10 and the optical recording medium are installed on the pickup base 1. At the same time, a yoke portion 30 for mounting the pick-up portion 21 is provided, and a cover 2 for protecting the pick-up portion 21 is provided on the pick-up portion 21.

Meanwhile, as illustrated in FIG. 5, the cover 2 is provided with a first elastic piece 2a and a second elastic piece 2a for elastically supporting the tangential skew and the radial skew adjustment. The first adjustment hole 30a is provided in the yoke portion 30 for seating the portion 21 so that the first adjustment member 70 for adjusting the tangential skew is screwed and at the same time the second adjustment hole 30b. The second adjusting member 71 for adjusting the radial skew is screwed in.

In addition, a frame 40 for fixing the suspension wire is installed on one side of the yoke portion 30 and is fixed integrally by the fixing member 80, thereby giving a technical configuration feature thereof.

Meanwhile, the yoke part 30 has a clamping groove 31 for fixing the frame 40 and the yoke part 30 integrally to clamp the elastic member 80 as shown in FIG. 4. Is formed.

At this time, it is preferable to form a fitting protrusion 81 at one end of the fixing member 80 to be fitted into the fixing groove 31 so as to be rotatable.

The first adjusting member 70 and the second adjusting member 71 may be screwed or rotated left and right, and may be an adjusting device that is fine-tuned and does not receive interference from the surroundings.

In addition, the second elastic piece 2a formed on the cover 2 may be assembled to the pickup base 1 independently of the cover 2. For example, by moving the second elastic piece 2a independently, there is no change in tangential skew during radial skew adjustment, and conversely, since there is no change in radial skew during tangential skew adjustment, skew can be adjusted more quickly. .

The assembling procedure of the optical recording medium configured as described above is performed by the power transmission device 10, the turntable 20, the pickup unit 21, the yoke unit 30, the frame 40, and the like on the pickup base 1 as follows. Assemble

At this time, the yoke portion 30 and the frame 40 are integrally fixed using the fixing member 80 as shown in FIG. 4.

Next, the first adjusting member 70 for adjusting the tangential skew is assembled to connect the pickup base 1 through the first adjusting hole 30a formed in the yoke portion 30.

Next, the second adjustment hole 30b formed in the yoke portion 30 and the frame 40 are assembled by screwing with the second adjustment member 71 for adjusting the radial skew.

Adjusting the tangential skew assembled as described above is rotated about the Y axis by the elastic force of the first elastic piece 2a formed on the cover 2 when the first adjusting member 70 is rotated to a desired angle. .

Subsequently, the radial skew adjustment is performed. The radial skew adjustment is rotated about the X axis by the second elastic piece 2b when the second adjusting member 71 is turned. In this case, the yoke portion 30 and the frame are rotated. The fitting protrusion 81 of the fixing member 80, which is fixed to the elastic body integrally 40, is rotated to a supporting point.

After the adjustment, the yoke portion 30 and the frame 40 are fixed by applying an adhesive.

As described above, the present invention forms the first elastic piece 2a and the second elastic piece 2b on the cover 2 and at the same time, the first adjustment on the yoke part 30 for seating the pickup part 21. The first adjusting member 70 for adjusting the tangential skew in the first adjusting hole 30a by providing the hole 30a and the second adjusting hole 30b and radial skew in the second adjusting hole 30b. By screwing the second adjusting member 71 to adjust the pressure, respectively, the problem arises by adjusting the radial skew by inserting the adjusting rod 60 into the adjusting groove 41 of the frame 40 in the conventional structure. After fixing, the back tension due to the frictional force between the frame and the yoke portion is fixed, and the adjustment is not corrected. Therefore, the information surface of the optical recording medium and the laser beam of the pickup portion have been increased due to the high speed and density. The accuracy of the inclined angle adjustment of the shaft and the productivity can be improved. There.

Claims (3)

A pick-up base mounted on one side of the power transmission device, the pick-up base fixing the turntable and the pick-up unit for reproducing and recording the optical recording medium; A cover for protecting the pickup; An elastic piece installed on the cover to support elasticity during skew adjustment; A yoke portion for seating the pick-up portion; A frame for fixing the suspension wires; Skew adjusting device of the optical pickup, characterized in that the fixing member for fixing the frame and the yoke. The method of claim 1, wherein a first adjustment member for adjusting the tangential skew in the first adjustment hole formed in the yoke portion, and a second adjustment member for adjusting the radial skew in the second adjustment hole, respectively. Skew adjusting device of the optical pickup characterized in. The skew adjusting apparatus of claim 1, wherein a fixing groove for fixing the frame and the yoke portion to elastically fix the groove is formed in the yoke portion.