KR100287323B1 - Skew Adjustment Structure of Optical Pickup Actuator - Google Patents

Abstract

The present invention is intended to allow the skew of the lens holder of the optical pickup actuator supported by the suspension wire to be adjusted by itself.

The present invention includes first to fourth poles 20 and 22 protruding integrally with the yoke 10 between each tracking coil 38 and focusing coil 36 of the optical pickup actuator and the lens holder 30. , 24, 26 and first to fourth skew adjusting coils 40 and 42 wound around the first to fourth poles 20, 22, 24 and 26, respectively, and fixed to the lens holder 30. And a skew adjustment structure comprising 44, 46, wherein the first to fourth skew adjustment coils 40, 42, 44 are inputted with a voltage value for compensating for skew to the controller to simultaneously drive the hologram element. By adjusting the skew of the lens holder 30 by itself to each of the lines 46, the assembly productivity can be improved by omitting the structure and the process for the separate skew adjustment.

Description

Skew Adjustment Structure of Optical Pickup Actuator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skew adjusting structure of an optical pickup actuator. In particular, the skew of a lens holder supported by a suspension wire is adjusted by itself, thereby eliminating a separate skew adjusting structure, thereby improving assembly productivity. It relates to a skew adjusting structure of the actuator.

In general, an optical pickup device is a device installed in a CD player for irradiating laser light to a disc and receiving light reflected from the disc to reproduce the recording contents of the disc. A hologram element for irradiating a laser and converting the reflected light into an electrical signal. And a pick-up base to which is fixed, and an optical pickup actuator for driving an objective lens that focuses the laser light emitted from the hologram element onto the disk surface.

One example of a product having a wire driving optical pickup actuator among the optical pickup devices is a lens holder 112 to which the objective lens 110 is attached, as shown in FIG. 1, by the suspension wire 114. The yoke 116 is supported by the yoke 116 so as to flow in the tracking direction, and the yoke 116 is mounted on the pickup base 130 provided with the hologram element.

On the other hand, the objective lens 110 is installed to be exactly horizontal to the plane of the disk, that is, the objective lens 110 must be installed so that the lens holder 112 can move along the optical axis exactly when driven up and down to focus. The size of the spot can be adjusted in such a way that the focus of the laser light formed at deviates from the track on the recording pit of the disc.

If the objective lens 110 is incorrectly adhered to the lens holder 112 and tilted so that it is not horizontal, when the lens holder 112 is driven up and down to focus, the objective lens 110 may be deviated from the optical axis, Since the focus of the light moves in an undesired tracking direction, the tracking error must be corrected again.

Accordingly, when the yoke 116 is assembled to the pick-up base 130 after the process of assembling the lens holder 112 and the suspension wire 114 to the yoke 116, the height balance of the yoke 116 is finally improved. Adjusting on the pickup base 130 allows the objective lens 110 to be exactly horizontal to the disk plane.

The through hole 118 is formed at one side of the yoke 116 for such a corrective operation, and the fixing screw 120 having the compression spring 122 inserted therein is inserted into the through hole 118 on the pickup base 130. By fastening to the screw hole 134 is formed, one side of the yoke 116 is to be fixed while having elasticity on the pickup base 130 by the elasticity of the compression spring 122.

Then, through holes 136 are formed in the horizontal and vertical pickup bases 130, respectively, from the through holes 118 formed in the pickup base 130 to adjust the horizontal and vertical height balances of the other side of the yoke 116. And inserting each adjustment screw 138 into each through hole 136 and fastening to each of the screw holes (not shown) formed in the yoke 116, and then tightening the respective adjustment screws 138. By adjusting the height balance of the horizontal and vertical height of the yoke 116, the objective lens 110 is made horizontal so that the axial direction of the laser light transmitted through the objective lens 110 is perpendicular to the disk.

Here, the horizontal direction and the vertical direction correspond to a direction in which the focus of the laser light formed by the objective lens 110 moves with respect to the recording feet of the disk, and means a radial direction and a tangential direction.

Therefore, by checking the level of the yoke 116 with the inspection equipment and by adjusting the height balance of the yoke 116 with two adjustment screws 138, the radial skew and the tangential skew of the objective lens 110 was adjusted.

As described above, in the conventional optical pickup actuator, in order to adjust the skew of the objective lens 110, one side of the yoke 112 is fixed to the fixing screw 120 in which the compression spring 122 is inserted to have elasticity in the pickup base 130. In order to adjust the height balance of the yoke 116, the yoke 116 was inclined in the radial direction and the tangential direction with two adjusting screws 138. In addition, the yoke 112 and the pickup base 130 are formed to be in contact with each other so that the yoke 112 is inclined along the sphere.

Therefore, the conventional optical pickup actuator has a complicated structure and an adjustment process for skew adjustment of the objective lens 110, and thus there is a problem in that the assembly productivity of the optical pickup actuator is reduced due to the increase in the number of parts and the number of processes.

The present invention has been made in order to improve the conventional problems, an object of the present invention is to improve the assembly productivity by eliminating a separate skew adjustment structure by allowing the skew of the lens holder supported by the suspension wire is adjusted by itself. .

1 is a perspective view showing a skew adjusting structure of a general optical pickup actuator.

2 is an exploded perspective view of the optical pickup actuator according to the present invention.

3 is a plan view showing a coupling state of the optical pickup actuator according to the present invention.

Figure 4a, 4b is a side cross-sectional view showing the skew adjustment action according to the present invention.

Figures 5a, 5b is a front sectional view showing a skew adjusting action according to the present invention.

<Explanation of symbols for main parts of drawing>

10: York 12: magnet

20: first pole 22: second pole

24: third pole 26: fourth pole

30: lens holder 32: objective lens

34: suspension wire 36: focusing coil

38: tracking coil 40: first skew adjusting coil

42: second skew adjusting coil 44: third skew adjusting coil

46: fourth skew adjusting coil

In order to achieve the above object, the present invention provides a lens holder in which a focusing coil is wound around and fixed to a position opposite to a tracking coil, a yoke for supporting the lens holder with a suspension wire, and a position opposite to the yoke. An optical pickup actuator having a magnet fixed to a pair to supply magnetic flux to the tracking coil and the focusing coil, the first pickup protruding integrally with the yoke between the tracking coil and the focusing coil and the lens holder. And a skew adjustment coil wound around the fourth to fourth poles and the first to fourth poles, respectively, and fixed to the lens holder.

In this skew adjusting structure, when a current is applied to each skew adjusting coil, an electromagnetic force for moving the lens holder in the optical axis direction is generated at a portion of the magnetic flux of the magnet, so that the lens holder is adjusted by adjusting the direction of the electromagnetic force of each skew adjusting coil. Can be tilted in the radial and tangential directions.

Therefore, the skew of the lens holder is adjusted by itself, so that the structure and the process for the separate skew adjustment are omitted, thereby improving assembly productivity.

Hereinafter, preferred embodiments of the present invention will be described to facilitate implementation of the present invention.

The present embodiment is a lens holder in which a focusing coil is wound around and fixed to a position where the tracking coil is opposed, a yoke for supporting the lens holder with a suspension wire, and a pair is fixed at an opposite position of the yoke. And it is applied to a wire driven optical pickup actuator having a magnet for supplying magnetic flux to the focusing coil.

As shown in FIG. 2, the first to fourth poles 20, which protrude integrally with the yoke 10, are formed between the respective tracking coils 38, the focusing coils 36, and the lens holder 30. 22, 24 and 26 and the first to fourth skew adjusting coils 40 wound around the first to fourth poles 20, 22, 24 and 26 and fixed to the lens holder 30, respectively. , 42,44,46. The first to fourth skew adjusting coils 40, 42, 44 and 46 are connected to the control unit by a separate path, so that the first to fourth skew adjusting coils 40, 42, 44 and 46 are connected to the controller. Allows you to adjust the direction and intensity of the voltage.

The optical pickup actuator is assembled as shown in FIG. 3, and the lens holder 30 to which the objective lens 32 is fixed is lifted and supported on the yoke 10 by the suspension wire 34, and the lens holder 30 is supported. The pair of magnets 12 are fixed to the yoke 10 so as to be positioned outside the focusing coil 36 wound around the head and the tracking coil 38 attached to both sides of the lens holder 30.

The first to fourth poles 20, 22, 24, and 26 formed on the yoke 10 are located inside the tracking coil and the focusing coil 36, and the first to fourth skew adjustment coils 40, 42, 44 and 46 surround the first to fourth poles 20, 22, 24 and 26, respectively, and are fixed to the lens holder 30.

Meanwhile, the voltage values of the first to fourth skew adjusting coils 40, 42, 44, and 46 for compensating the skew are measured in advance through experiments and input to the controller, and the first to fourth simultaneously with the driving of the hologram element. By programming a voltage value applied to the skew adjustment coils 40, 42, 44 and 46 simultaneously, the driving action of the lens holder 30 and the skew adjustment are simultaneously performed.

Hereinafter, the skew adjusting operation of the optical pickup actuator having the above configuration will be described.

First, the current is applied to the first to fourth skew adjusting coils 40, 42, 44, and 46 while measuring the skew value of the lens holder 30 with an inspection device to determine the skew value of the lens holder 30. The skew is adjusted, and the voltage values applied to the first to fourth skew adjusting coils 40, 42, 44, and 46 are input to the controller in the state where the skew is adjusted.

Here, the operation of adjusting the skew of the lens holder 30 will be described.

First, when skew occurs in the radial direction, as shown in FIG. 4A, when the lens holder 30 is inclined to the right side based on the drawing, the first skew adjustment coil 40 and the third skew adjustment coil 44 on the left side are inclined. The voltage is applied in the direction in which the electromagnetic force is generated downward, and the voltage is applied in the direction in which the electromagnetic force is generated upward to the second skew adjusting coil 42 and the fourth skew adjusting coil 46 on the right side. Therefore, the lens holder 30 receives a rotating torque twisted in the counterclockwise direction so that the skew in the radial direction is adjusted.

In addition, as shown in FIG. 4B, when the lens holder 30 is inclined to the left side based on the drawing, the voltage is generated in a direction in which electromagnetic force is generated upward on the first skew adjusting coil 40 and the third skew adjusting coil 44 on the left side. And a voltage is applied to the second skew adjusting coil 42 and the fourth skew adjusting coil 46 on the right side in the direction in which the electromagnetic force is generated. Therefore, the lens holder 30 receives a rotating torque twisted clockwise to adjust the skew in the radial direction.

Meanwhile, when skew occurs in the tangential direction of the lens holder 30, when the lens holder 30 is inclined to the right side as shown in FIG. 5A, the first skew adjusting coil 40 and the second skew adjusting coil ( The voltage is applied to 42 in the direction in which the electromagnetic force is generated downward, and the voltage is applied to the third skew adjustment coil 44 and the fourth skew adjustment coil 46 on the right side in the direction in which the electromagnetic force is generated. Therefore, the lens holder 30 receives a rotating torque twisted in the counterclockwise direction so that the tangential skew is adjusted.

In addition, when the lens holder 30 is inclined to the left side as illustrated in FIG. 5B, a voltage is applied to the first skew adjusting coil 40 and the second skew adjusting coil 42 on the left side in a direction in which electromagnetic force is generated. Voltage is applied to the third skew adjusting coil 44 and the fourth skew adjusting coil 46 on the right side in the direction in which the electromagnetic force is generated. Therefore, the lens holder 30 receives a rotational torque that is twisted clockwise so that the tangential skew is adjusted.

Therefore, in the optical pickup actuator of the present embodiment, laser light is irradiated from the hologram element to the objective lens 32 to reproduce the recording of the disc, and at the same time the focal point of the laser light is formed on the disc in the objective lens 32, Voltages are applied to the fourth to fourth skew adjustment coils 40, 42, 44, and 46 to adjust the skew of the lens holder 30.

In this way, the lens holder 30 is in a state where the skew is adjusted at the same time as the hologram element is driven, and when a current is applied to the tracking coil 38 and the focusing coil 36, the lens holder 30 is driven to focus the laser light. Correct the tracking error and focus error that occurred.

Therefore, in the optical pickup actuator of the present embodiment, since the skew of the lens holder 30 is adjusted by itself, the structure and the process for the separate skew adjustment may be omitted.

As described in the above embodiment, the present invention provides a first projection which is integrally formed with the yoke 10 between each tracking coil 38 and focusing coil 36 of the optical pickup actuator and the lens holder 30. To first to fourth poles 20, 22, 24, and 26, and first to fourth poles 20, 22, 24, and 26, respectively, fixed to the lens holder 30. A skew adjusting structure composed of fourth skew adjusting coils (40, 42, 44, 46), wherein a voltage value for compensating for skew is input to a control unit to drive a hologram element and simultaneously input a voltage value input in advance. By applying the skew adjustment coils 40, 42, 44 and 46 to adjust the skew of the lens holder 30 by itself, the structure and the process for the separate skew adjustment can be omitted, thereby improving the assembly productivity. have.

Claims (1)

A lens holder 30 around which the focusing coil 36 is wound and the tracking coil 38 is opposed, a yoke 10 for supporting the lens holder 30 with a suspension wire 34; In the optical pickup actuator provided with a magnet 12 is fixed to the opposite position of the yoke 10 to supply the magnetic flux to the tracking coil 38 and the focusing coil 36, First to fourth poles 20, 22, 24, 26 protruding integrally with the yoke 10 between each of the tracking coil 38 and the focusing coil 36 and the lens holder 30. and, First to fourth skew adjusting coils 40, 42, 44, and 46 that are wound to surround the first to fourth poles 20, 22, 24, and 26, respectively, and are fixed to the lens holder 30. And a skew adjusting structure of the optical pickup actuator.