KR20000013729U - Skew adjustment structure of optical pickup device - Google Patents

Abstract

The present invention is to improve the assembly productivity by reducing the number of parts and the number of processes required for skew adjustment of the optical pickup device.

The present invention for this purpose, inserting the yoke 11 in the pickup base 10 formed by molding, forming a spherical groove 44 in the bottom surface of the gel holder 42, the upper surface of the pickup base 10 As a skew adjusting structure of the optical pick-up apparatus in which the spherical protrusions 18 coupled to the spherical grooves 44 are formed, the spherical grooves 44 of the gel holder 42 are coupled to the spherical protrusions 18 of the pickup base 10. By removing the skew of the lens holder 30 in the state, and bonding the gel holder 42 directly to the pickup base 10 to fix it, the number of parts required for skew adjustment and the assembly process are reduced, thereby improving assembly productivity. have.

Description

Skew adjustment structure of optical pickup device

The present invention relates to a skew adjusting structure of an optical pickup device. In particular, the skew adjustment is performed by inserting and fixing a yoke to a pickup base and fixing a gel holder fixing a suspension wire on the pickup base. It relates to a skew adjusting structure of the optical pickup device for improving the assembly productivity by reducing the number of parts and the number of processes required.

In general, an optical pickup device is installed in a CD player to irradiate a disc with a laser beam and to receive light reflected from the disc to reproduce the recorded contents of the disc. And a lens holder for driving the objective lens for focusing the laser beam radiated from the hologram element on the disk surface, and a yoke for supporting the lens holder on the pickup base.

One example of such an optical pickup device in which the lens holder is supported on the suspension wire is as shown in FIG. 1, in which the lens holder 112 to which the objective lens 110 is adhered is attached to the suspension wire 114 in the focusing direction and the tracking direction. It is supported by the yoke 116 so that it can flow, and this yoke 116 is structured on the pick-up base 130 provided with the hologram element.

On the other hand, the objective lens 110 is installed in parallel with the plane of the disk, that is, the lens holder 112 must be in a state that can move along the optical axis exactly when driving up and down to focus, the objective lens 110 The focal point of the laser beam formed at s does not depart from the track of the recording pit of the disc and the size of the light spot can be adjusted.

If the objective lens 110 is tilted to the lens holder 112 and is not horizontal, the objective lens 110 may deviate from the optical axis when the lens holder 112 is driven up and down to focus, or Since the focus moves in the 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 parallel 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 formed screw hole 134, one side of the yoke 116 is elastically fixed 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. Each adjustment screw 138 is inserted into each through hole 136 and fastened to a screw hole (not shown) formed in the yoke 116. Then, by adjusting the tightening degree of each adjustment screw 138 to adjust the horizontal and vertical height balance of the yoke 116, the objective lens 110 is made horizontal so that the laser beam transmitted through the objective lens 110 The axial direction of was made perpendicular to the disk. Here, 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.

In the above, the horizontal direction and the vertical direction correspond to a direction in which the focus of the laser beam 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.

In this way, by inspecting 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. When the skew of the objective lens 110 is removed, the fixing screw 120 and the two adjusting screws 138 are bonded and fixed to complete the process of assembling the yoke 116 to the pickup base 130.

As described above, in the conventional optical pickup apparatus, the yoke 112 is provided to support the suspension wire 114 to adjust the skew of the objective lens 110, and the compression spring 122 is fitted to one side of the yoke. The fixing screw 120 was fastened and the yoke 116 was tilted on the pickup base 130 using two adjusting screws 138.

Therefore, the conventional optical pickup device has a complicated structure and assembly process for skew adjustment of the objective lens 110, so there is a problem that the assembly productivity is low due to the excessive number of parts and the number of processes.

The present invention has been made to solve the conventional problems, and an object of the present invention is to insert the yoke into the pickup base and fix it, and to adjust the skew adjustment on the pickup base by holding a gel holder fixing the suspension wire. It is to improve assembly productivity by reducing the number of parts and process.

1 is a perspective view of a general optical pickup device.

Figure 2 is an exploded perspective view of the optical pickup device according to an embodiment of the present invention.

3 is a cross-sectional view of the coupling state of the optical pickup device shown in FIG.

<Explanation of symbols for main parts of drawing>

10: Pickup Base 11: York

12: first pole 14: magnet

16: 2 pole 18: spherical protrusion

20: hologram element 22: total reflection mirror

30: lens holder 32: focusing coil

34: tracking coil 36: objective lens

40: suspension PC 42: gel holder

44: spherical groove 45: groove

46: suspension wire 48: coil PC

The present invention for achieving the above object, the lens holder is fixed to the objective lens, the tracking coil and the focusing coil, a suspension PCB for supporting the lens holder with a suspension wire, and fixed to the suspension PCB and in contact with the suspension wire An optical pickup apparatus having a gel holder for storing a silicon gel; A spherical groove formed on the bottom of the gel holder; A pickup base on which a hologram element for irradiating a laser beam to the objective lens and a total reflection mirror for changing a path of the laser beam are fixed and servoped in a tracking direction on the deck; A spherical protrusion formed on an upper surface of the pickup base and coupled to the spherical groove; A yoke formed with a first pole positioned at one side of the tracking coil and the focusing coil and a second pole positioned at the other side of the tracking coil and the focusing coil and inserted into the pickup base; And a magnet fixed to one side of the first pole.

This skew adjustment structure combines the spherical groove with the spherical protrusion so that the tracking coil and the focusing coil fixed to the lens holder are located on both sides of the magnet. When removed, bonding the gel holder to the pickup base completes the skew adjustment and assembly.

Therefore, the present invention can adjust the skew of the lens holder as a simple structure and complete the assembly work, thereby improving assembly productivity by reducing the number of parts and the assembly process required for skew adjustment.

Hereinafter will be described a preferred embodiment according to the present invention to facilitate the implementation of the present invention.

2 is an exploded perspective view of the optical pickup apparatus according to the present embodiment. As shown in this figure, in this embodiment, the lens holder 30 to which the objective lens 36, the tracking coil 34, and the focusing coil 32 are fixed, and the lens holder 30 are suspended by the suspension wire 46. As shown in FIG. ) Is applied to an optical pickup apparatus including a suspension holder (40) supported by a) and a gel holder (42) which is fixed to the suspension PCB (40) and stores a silicon gel in contact with the suspension wire (46).

In this embodiment, the pick-up base 10 in which the hologram element 20 for irradiating the laser beam to the objective lens 36 and the total reflection mirror 22 for changing the path of the laser beam are fixed and servoped in the tracking direction on the deck. Is prepared by plastic molding.

The first pole 12 located on one side of the tracking coil 34 and the focusing coil 32 and the tracking coil 34 and the focusing coil 32 on the other side of the pickup base 110 during the manufacturing process The metallic yoke 11 in which the two poles 16 are formed is inserted above the pickup base 10.

And the magnet 14 is fixed to one side of the first pole 12.

In the above, the second pole 16 is formed on the yoke 11. The magnetic flux of the magnet 14 passes through the second pole 16, the pickup base 10, and the first pole 12, and then again the magnet 14. The magnetic flux of the magnet 14 passes through the tracking coil 34 and the focusing coil 32 horizontally and strongly by forming a magnetic closure circuit that enters.

Meanwhile, in order to adjust the tilt of the lens holder 30, a spherical groove 44 is formed on the bottom of the gel holder 42, and a spherical protrusion 18 coupled to the spherical groove 44 on the upper surface of the pickup base 10. To form. And when the work for adjusting the tilt of the lens holder 30, grooves 45 are formed on both sides of the gel holder 42 in order to pick up the gel holder 42 by the axis provided in the jig.

Hereinafter, the assembling process of the optical pickup device having the above configuration will be described.

First, the objective lens 36 is fixed to the center of the lens holder 30, the focusing coil 32 is wound on the side of the lens holder 30, and then the two sides of the normal direction with respect to the disk are wound in a square shape. The tracking coil 34 is bonded. The coil PC 48 is fixed to both sides of the lens holder 30 in the tracking direction with respect to the disk, and the focusing coil 32 and the tracking coil 34 are connected to the coil PC 48.

Then, the suspension PC 40 and the gel holder 42 are assembled using a separate jig, the suspension wire 46 passes through the suspension PC 40 and the gel holder 42, and then once the coil PC 48 The other end is connected to the suspension PCB 40, respectively.

Accordingly, the lens holder 30 is supported by the suspension PCB 40 by the suspension wire 46, and the driving voltage applied from the signal processing unit to the suspension PCB 40 is transferred to the focusing coil 32 through the suspension wire 46. And the tracking coil 34 can be applied.

By injecting and curing the silicone gel in the gel holder 42 in such a state, the negative resonance of the suspension wire 46 can be attenuated by the viscosity of the silicone gel.

3 illustrates a state in which the gel holder 42 and the lens holder 30 are assembled to the pickup base 10. As shown in this figure, the tracking coil 34 and the focusing coil 32 fixed to the lens holder 30 are located on both sides of the magnet 14, and the spherical groove 44 formed in the bottom surface of the gel holder 42. ) Is coupled to the spherical protrusion 18 formed on the pickup base 10.

The lens is inserted into the groove 45 formed in the gel holder 42 by the shaft provided in the jig, and the gel holder 42 is stably picked up, while the skew inspection equipment measures the skew of the lens holder 30. When the holder 30 is tilted, the gel holder 42 is tilted while the spherical groove 44 slides on the spherical protrusion 18.

As soon as the skew of the lens holder 30 is removed by such an operation, the gel holder 42 is bonded and fixed to the pickup base 10 to complete the assembly work. At this time, if the UV curing bond is used, the bonding operation is performed quickly.

As described in the above embodiment, the present invention inserts the yoke 11 in the pickup base 10 formed by molding, forms a spherical groove 44 in the bottom of the gel holder 42, and the pickup base ( As a skew adjusting structure of the optical pickup device having a spherical protrusion 18 coupled to the spherical groove 44 on the upper surface of the top surface 10, the spherical protrusion 44 of the pick-up base 10 is moved to the spherical groove 44 of the gel holder 42. By removing the skew of the lens holder 30 in the state coupled to the (18), by bonding the gel holder 42 directly to the pickup base 10 to fix it, the number of parts required for skew adjustment and the assembly process are reduced to reduce the assembly productivity Has the effect of improving.

Claims (1)

A lens holder 30 to which the objective lens 36, the tracking coil 34 and the focusing coil 32 are fixed, a suspension PCB 40 for supporting the lens holder 30 with a suspension wire 46, and Claims [1] An optical pickup apparatus comprising a gel holder 42 fixed to a suspension PCB 40 and storing a silicon gel in contact with the suspension wire 46; A spherical groove 44 formed on the bottom of the gel holder 42; A pickup base 10 to which the hologram element 20 for irradiating a laser beam to the objective lens 36 and the total reflection mirror 22 for changing the path of the laser beam are fixed and servoped in a tracking direction on the deck; A spherical protrusion 18 formed on an upper surface of the pick-up base 10 and coupled to the spherical groove 44; The first pole 12 located on one side of the tracking coil 34 and the focusing coil 32 and the second pole 16 located on the other side of the tracking coil 34 and the focusing coil 32 are A yoke (11) formed and inserted into the pickup base (10); And And a magnet (14) fixed to one side of the first pole (12).