KR100203467B1 - Angle correcting device of yoke - Google Patents

Abstract

The present invention relates to a precision correction device for the yoke plate for an optical pickup actuator, comprising: a fixing member on which the yoke plate is placed; A recess plate formed at an upper portion thereof, and a support plate vertically installed at both sides thereof with a press pillar; A lower main body supported by the press pillar, the main body having a hydraulic cylinder installed vertically in the center thereof; An up and down moving shaft moving up and down by the operation of the hydraulic cylinder; In the precision correction device of the yoke plate made of a pressing member attached to the end of the upper and lower movable shafts and fixed to the fixing member by pressing the yoke plate to the pressing surface and the groove is formed on the bottom surface, the pressing member 170 A plurality of correction protrusions 210 having vertical gaps 220 are formed on the lower surface of the), and inclined surfaces are formed on the inner side of the inlet of the gaps 220, respectively. The flatness of the yoke plate 120 and the orthogonality of the yoke 120A may be improved to reduce the defective rate of the optical pickup actuator.

Description

Yoke Squareness Corrector

1 is an exploded perspective view of an optical pickup actuator having a conventional structure.

2 is a perspective view of an optical pickup actuator having a conventional structure.

3 is a cross-sectional view of a conventional yoke plate precision correction device.

4 is a cross-sectional view of the yoke squareness correction apparatus according to the present invention.

5 is an enlarged cross-sectional view of the main portion of the A-A line of FIG.

6 is a view showing an operating state of the orthogonality correction device of the yoke according to the present invention.

* Explanation of symbols for main parts of the drawings

120: yoke plate 120A: yoke

172: groove 210: correction protrusion

220: crevice

The present invention relates to an orthogonality correction device for the yoke plate constituting the optical pickup actuator, and in particular, precisely corrects the flatness of the yoke plate by pressing the bottom surface of the yoke plate, which serves as a support in the optical pickup actuator. In addition, the present invention relates to a yoke right angle correction device configured to easily correct the right angle of the yoke.

In general, the optical pickup actuator is installed vertically below the disc, which is an optical recording medium of various optical disc players such as a mini disc player (MDP), a compact disc player (CDP), or a laser disc player (LDP), and has a radial direction with respect to the disc. While detecting the desired track position on the disc while moving in a straight line, laser light is incident on the pit recorded on the disc at the detected track position, the reflected light is detected through an optical system, and the detected reflected light is converted into a signal A device for reproducing the recorded contents on a disc.

This conventional optical pickup actuator is located in the lower portion of the actuator, as shown in Figure 1 and the center of the yoke plate 20 is formed with a laser passage hole (1); An inner and outer yoke (21) and (22) having a U-shape fixed at a predetermined position of the yoke plate (20); A second yoke (23) spaced apart from the outer yoke (22) and fixed to a longitudinal outer side of the yoke plate (20); A permanent magnet 24 fixed to an inner surface of the outer yoke 22; An objective lens (25) installed above the laser passage hole (1) of the yoke plate (20) to focus the laser light on the disk reflection surface; A square objective lens holder 26 for supporting the objective lens 25; A focusing adjustment coil (27) installed on an inner surface of the objective lens holder (26) and fitted to flow from the inner yoke (21) and controlling movement of the objective lens in the optical axis direction; A tracking adjustment coil (28) attached to the focusing adjustment coil (27) for controlling movement in the radial direction of the objective lens (25); Four wires 29 which perform a function of suspension to receive the input and output signals from the servo system to the focusing adjustment coil 27 and the tracking adjustment coil 28 to attenuate vibrations when the objective lens holder 26 is operated. )Wow; A gel holder 30 fixed to a predetermined position of the yoke plate 20 to fix one end of the wire 29; A PCB 31 attached to an outer side of the gel holder 30 to receive an input / output signal of a servo system; A signal transmission piece 32 installed on both sides of the objective lens holder 26 to electrically connect the wire 29 with the focusing adjustment coil 27 and the tracking adjustment coil 28; The balance lens 33 is provided at a predetermined position of the objective lens holder 26 to correct the center of gravity.

The objective lens holder 26 has a square shape and has a structure in which the objective lens 25 is installed outside the square.

That is, a focusing adjustment coil 27 and a tracking adjustment coil 28 are installed to movably couple the inner yoke 21 from the center of gravity of the objective lens holder 26 so that the center point and the actuator when the optical pickup actuator is driven. The center of gravity of the coincidence coincides with the center of gravity of the objective lens according to the repulsive force of the permanent magnet 24 and the current transmitted to the focusing adjustment coil 27 and the tracking adjustment coil 28 mounted inside the objective lens holder 26. Holder 26 will be enough to move.

In addition, a groove (not shown) is formed at a predetermined position of the objective lens holder 26 so that a balance 33 for correcting the center of gravity when driving is fitted.

The operation and effects of the conventional optical pickup actuator configured as described above are described in detail.

As shown in FIG. 1 and FIG. 2, the servo system detects the focusing and tracking states at the recording feet of the laser beam by a photo detector on the optical system and when the correction of the focusing and tracking states is necessary. Transmits an electrical signal to the PCB 31 and is installed at the center of gravity in the objective lens holder 26 by an electric signal transmitted from the PCB 31 to the signal transmission piece 32 through the wire 29. The focusing adjustment coil 27 and the tracking adjustment coil 28 are subjected to Lorentz driving force.

Then, when a current is applied to the focusing adjustment coil 27 and the tracking adjustment coil 28 through the wire 29, it is mounted on the inner surfaces of the tracking adjustment coil 27 and the focusing adjustment coil 26 and the outer yoke 22. A repulsive force is generated between the permanent magnets 24 to drive the objective lens holder 26.

In this case, an inner yoke 21 is installed at the center of gravity of the objective lens holder 26 so that the focusing adjustment coil 27 is fluidly coupled so that the center point and the center of gravity point of the objective lens holder 26 are driven. Done.

Therefore, only one focusing adjustment coil 27 and tracking adjustment coil 28 can sufficiently control the movement of the objective lens holder 26.

That is, when a current is applied to the focusing adjustment coil 27 in the objective lens holder 26, the objective lens holder 26 moves in the optical axis direction, and a current is applied to the tracking adjustment coil 28 in the objective lens holder 26. When is applied, the objective lens holder 26 moves in the radial direction.

However, the inner and outer yokes 21 and 22 and the second yoke 23 are formed on the upper surface of the yoke plate 20 by press working, and together with this, the laser passage hole 1 is formed. In this case, the flatness of the yoke plate 20 should be precisely maintained since the precision operation members such as the objective lens holder 26 and the wire 29 are installed on the yoke plate 20.

However, since the conventional yoke plate 20 does not correct the flatness separately after forming the inner and outer yoke 21, 21 and the second yoke 23 by pressing, the yoke plate ( The flatness of 20) is not precisely maintained, resulting in a problem that performance of the optical pickup actuator is degraded.

Therefore, in the related art, in order to solve the above problems, as shown in FIG. 3, the rectangular fixing member 60 having the yoke plate 20 settled thereon; A support plate 90 which is secured to the recess 91 formed in the fixing member 60 and supports the plurality of press pillars 80; A main body 51 supported by the press pillar 80; The fixing member 60 is attached to the up and down moving shaft 52A moving up and down by the hydraulic cylinder 52 installed in the main body 51 and the end of the up and down moving shaft 52A. A pressing member 70 which presses the yoke plate 20 settled on the pressing surface 71 and has a groove 72 formed on the bottom surface thereof; The shape and the like of the yoke plate are corrected by the precision correction device 50 of the yoke plate composed of the operation buttons 53 attached to the main body 51.

On the other hand, the precision correction device of the yoke plate can easily correct the flatness in the left and right directions of the yoke plate, but when the yoke is bent to the left and right, the right angle of the yoke There is a problem that cannot be precisely corrected.

The present invention has been made in view of this point, and an object of the present invention is to move up and down by a hydraulic cylinder in a state in which the yoke plate of the optical pickup actuator is fixed with a fixing member, and a correction protrusion and By using the pressure member provided with the gap portion to precisely correct the flatness of the yoke plate and the right angle of the yoke.

An object of the present invention as described above, the yoke plate is a rectangular fixing member is placed on the top; A support plate having a recessed portion formed at an upper portion thereof so that the fixing member is placed thereon, and press pillars vertically installed at both upper sides thereof; A main body having both lower sides supported by the press pillars of the support plate, and a hydraulic cylinder installed vertically at the center thereof; An up and down moving shaft moving up and down by the operation of the promising cylinder of the main body; In the correction device of the optical pick-up actuator yoke plate consisting of a pressing member attached to the end of the upper and lower moving shaft attached to the fixed member and pressed into the pressing surface and the groove is formed in the bottom surface, A plurality of correction protrusions having vertical gaps are formed on the lower surface of the pressing member so that the yoke of the yoke plate is inserted, and inclined surfaces are formed on the inlet of each gap to guide the insertion of the yoke. It is achieved by providing a device for correcting the squareness of the yoke.

Hereinafter, embodiments of the present invention will be described in detail with the accompanying drawings.

As shown in FIGS. 4 to 5, the present invention provides a rectangular fixing member 160 for placing the yoke plate 120 constituting the optical pickup thereon; A support plate 190 formed at an upper portion thereof so that the fixing member 160 is placed thereon, and press pillars 180 vertically installed at both sides thereof; A main body 151 on which both sides of the lower part are supported by the press pillars 180 of the support plate 190, and a hydraulic cylinder 152 is installed at the center thereof; An up and down moving shaft 152A moving up and down by the operation of the hydraulic cylinder 152 of the main body 151; Pressing the yoke plate 120 attached to the end of the upper and lower movable shaft 152A and placed in the fixing member 160 to the pressing surface 171 and the groove 172 to the bottom surface It is made of a member 170, in particular to form a plurality of correction projections 210 having a gap portion 220 so that the yoke is inserted into the groove 172 formed on the lower surface of the pressing member 170, At the inlet of the gap 220, inclined surfaces are formed to guide the insertion of the yoke, respectively.

The operation and effects of the present invention having the structure as described above will be described in detail below.

As shown in FIG. 6, the yoke plate 120 fixes the fixing member 160 to the recess 191 of the support plate 100 and requires correction of the precision of the fixing member 160. ) Is installed so that the operation button 153 attached to the main body 151 is operated, and the hydraulic cylinder 152 is operated to move the up and down moving shaft 152A downward.

Then, when the up and down movement shaft 152A is lowered, the tip of the correction protrusion 210 of the pressing surface 171 presses the bottom surface of the yoke plate 120 placed on the fixing member 160. On the other hand, by vertically pressing the front and rear surfaces of the yoke 120A inserted into the gap portion 220, it is possible to correct the flatness of the bottom surface of the yoke plate 120 and the perpendicularity of the yoke 120A.

That is, in the present invention, the yoke 120A of the yoke plate 120 is press-fitted between the gaps 220 to correct the perpendicularity, and the correction protrusion 210 of the pressing surface 171 is the yoke plate. The flatness of the bottom surface of the yoke plate 120 is corrected by pressing the left and right bottom surfaces of the 120.

As such, when the flatness correction of the yoke plate 120 is finished, the pressing member 170, which has been press-fitted, moves up and down 152A by the return action of the hydraulic cylinder 152, and returns to its original state. After the return, the yoke plate 120 having the corrected flatness and the perpendicularity to the yoke 120A is fixed.

Then, another yoke plate 120 is placed on the fixing member 160 and the operation button 153 is pressed to operate the hydraulic cylinder 152 to flatten the yoke plate 120 with the pressing member 170. Just repeat the operation to calibrate.

As described above, in the present invention, the yoke plate 120 is placed in the upper portion of the fixing member 160, and the hydraulic cylinder 152 is operated to precisely press the correction plate 210 and the gap 220. Pressing the surface of the yoke plate 120 with a pressing member 170 having a surface 171 to correct the perpendicularity to the yoke 120A and the flatness of the bottom surface of the yoke plate 120 By correcting this, the accuracy of the optical pickup actuator can be improved, and at the same time, it has a useful effect of reducing the defective rate of the optical pickup actuator.

Claims (1)

A rectangular fixing member on which the yoke plate is placed; A support plate having a recessed portion formed at an upper portion thereof so that the fixing member is placed thereon, and press pillars vertically installed at both upper sides thereof; A main body having both lower sides supported by the press pillars of the support plate, and a hydraulic cylinder installed vertically at the center thereof; Up and down moving shaft to move up and down by the operation of the hydraulic cylinder of the main body; In the correction device of the optical plate actuator for the optical pickup actuator consisting of a pressing member attached to the end of the upper and lower moving shafts, the yoke plate placed in the fixing member to the pressing surface and the groove is formed in the bottom surface, On the lower surface of the pressing member 170, a plurality of correction protrusions 210 having vertical gaps 220 are formed to insert the yoke 120A of the yoke plate 120, respectively, and each of the gaps described above. Orthogonality correction device of the yoke, characterized in that each inclined surface is formed to guide the insertion of the yoke (120A) inside the inlet of the portion 220.