KR0135646Y1 - A damping gel leakage preventing structure of optical pickup actuators - Google Patents

Abstract

The present invention relates to a holder gel of an optical pick-up actuator, wherein the damping gel (54) is injected into the through hole (51) penetrating in the front and rear directions to damp the wire (80).

And a suspension PCB (60) fixedly coupled to a rear surface of the holder gel (50) by a fixing screw (70), and having an end portion of the wire (80) soldered thereto. The inclined portion 52 gradually narrowing in diameter continuously in the through hole 51 of the through hole 51), and is formed to be recessed in a predetermined depth on the rear surface of the holder gel 50 in succession to the inclined portion 52, A concave fitting groove 53 in which an arc-shaped concave portion is formed on a wall surface, a plurality of fitting protrusions 61 protruding forward of the suspension PCB 60 so as to fit exactly in the concave fitting groove 53, and the Damping gel of the optical pickup actuator, characterized in that composed of a leakage blocking member 90 is pressed into the outer circumferential surface of the fitting projection 61 and the inner surface of the concave fitting groove 53 to prevent the leakage of the damping keel 54. Leak-proof structure, filled in holder gel Is that to prevent the damping gel from leaking out.

Description

Damping Gel Leakage-Proof Structure of Optical Pickup Actuator

1 is an exploded perspective view of a general wire type optical pickup actuator.

2 is a perspective view of a coupling state of a general wire type optical pickup actuator.

3 is a cross-sectional view of a conventional holder gel and suspension PCB.

Figure 4 is an exploded perspective view of the damping gel leak prevention structure according to the present invention.

5 is a cross-sectional view of the damping gel leak prevention structure according to the present invention.

* Explanation of symbols for main parts of the drawings

50: holder gel 51: through hole

52: inclined portion 53: recessed groove

54 Damping Gel 60 Suspension PCB

61: fitting protrusion 62: installer

64: recess 90: leakage blocking member

The present invention relates to a holder gel of an optical pickup actuator, and in particular, an optical pickup actuator that prevents the damping gel, which is a semi-liquid material injected into the holder gel, from leaking out of the suspension PCB to properly control the vibration of the suspension wire. A damping gel leak prevention structure of the present invention.

In general, the optical pickup actuator is installed in a vertical direction 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), so that it is straight in the radial direction of the disc. While moving, it detects the desired track position on the disk, and at the detected track position, the laser light is incident on the pit recorded on the disk surface, and then the reflected light is detected through the optical system, and the detected reflected light is converted into a signal to record on the disk surface. It is a device to play content.

As shown in FIG. 1, a conventional optical pickup actuator includes a plate 20 formed at a lower portion of the actuator and having a laser passage hole 1 formed therein, and a U-shaped inner plate fixed at a predetermined position of the plate 20. As shown in FIG. The second yoke 23 fixed to the outer side in the longitudinal direction of the plate 20 and the outer yoke 21, 22 and a predetermined interval is fixed to the inner surface of the outer yoke 22 is fixed A permanent magnet 24, an objective lens 25 provided above the laser passing hole 1 provided in the plate 20, for connecting a focus to the disk reflecting surface, and the objective lens 25 The objective lens holder 26 having a rectangular structure, which is formed to support the outside, and is installed on the inner surface of the objective lens 25 so as to flow into the inner yoke 21 to be fitted to the optical axis direction of the objective lens 25. Focusing adjustment coil 27 for controlling the movement to the, A tracking adjustment coil 28 installed on an inner surface of the objective lens holder 26 and mounted on an outer surface of the focusing adjustment coil 27 to control movement of the objective lens 25 in a radial direction, and the objective The input / output signal of the servo system is transmitted to the focusing adjustment coil 27 and the tracking adjustment coil 28 located on the inner surface of the lens holder 26, while supporting the swing of the objective lens holder 26 and from the outside. Four wires 29 to serve as a suspension to attenuate the vibration during the impact action, the holder gel 30 is fixed to the second yoke 23 to support the wires 29, and PCB 31 attached to the outer side of the holder gel 30 and receiving input and output signals of the servo system, and installed on both sides of the objective lens holder 26 to provide the wire 29 and the focusing adjustment coil 27. ) And coiled PCB (3) for electrically connecting the tracking adjustment coil (28). 2) and a balancer 33 provided at a predetermined position of the objective lens holder 26 to correct the center of gravity.

In addition, the objective lens holder 26 of the actuator according to the present invention has a shape such as a square, 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 at the center of gravity of the objective lens holder 26 so as to be able to be inserted into the inner yoke 21 so that the optical pickup actuator is driven. The center of gravity of the driving force center point of the coil and the objective lens holder 26 coincide with each other, and thus the permanent magnet (28) is mounted on the focusing adjustment coil 27 and the tracking adjustment coil 28 mounted inside the objective lens holder 26. With the Lorentz driving force of 24, the objective lens holder 26 is sufficiently moved. In addition, a groove, not shown in the drawing, is formed at a predetermined position of the objective lens holder 26 so that the balancer 33 for correcting the center of gravity when driving is fitted.

FIG. 2 is a cross-sectional view of the holder gel, in which four through holes 35 are formed, which are penetrated forward and rearward to allow the wire 29 to be fitted into the holder gel 30. The damping gel 34, which is a semi-liquid material, is injected into the wire 29 to absorb vibrations when the wire 29 vibrates. A suspension PCB 31 is fixed to the rear surface of the holder gel 30. 33) is fixedly coupled, the rear of the through hole 35 is configured to have a small diameter.

Thus, the operation of the conventional optical pickup actuator configured in detail as follows.

As shown in Figs. 1 to 3, the focusing and tracking states of the recording beams of the laser beam are detected by a photo detector on the optical system. In this case, when calibration is necessary as a result of detecting the focusing and tracking states, the servo system transmits an electrical signal to the PCB 31. Focusing adjustment coil 27 and tracking adjustment coil 28 installed at the center of gravity in the objective lens holder 26 by an electrical signal transmitted from the PCB 31 to the coil PCB 32 via the wire 29. The magnetic flux with the permanent magnet 24 receives the 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, the tracking adjustment coil 28 and the focusing adjustment coil 27 and the inner surface of the outer yoke 22 are mounted. The Lorentz driving force between the permanent magnets 24 is generated and the objective lens holder 26 is driven. At this time, the inner yoke 21 is installed in the center of gravity of the objective lens holder 26 so that the focusing adjustment coil 27 is flowed so that the center of the driving force and the moving part of the coil when the objective lens holder 26 is driven. The center of gravity of the lens holder 26 coincides.

As described above, when current is applied to the focusing adjustment coil 27 and the tracking adjustment coil 28 through the wire 29, a strong Lorentz driving force is generated between the permanent magnets 24 attached to the inner surface of the outer yoke 22, respectively. The objective lens holder 26 is operated in the tracking direction and the focusing direction. At this time, a strong repulsive force is applied to the permanent magnet 24 and a strong repulsive force is also applied to the outer yoke 22 supporting the permanent magnet 24. Will be added.

Meanwhile, as the objective lens holder 26 operates in the up, down, left, and right directions, the damping gel 34 filled in the through hole 35 of the holder gel 30 is formed before or after the through hole 35. By properly absorbing the vibration of the wire 29 installed through the rear direction to assist the correct operation performance comes out of the wire (29).

By the way, in general, the damping gel is injected into the holder gel to cure the damping gel by blowing high temperature hot air of at least several degrees while the optical pickup actuator is mounted in the thermostat. Is formed relatively large, there is a problem that the damping gel leaks out due to the gap between the through-hole and the suspension PCB by the high temperature hot air.

That is, as described above, since a large portion of the space in the through hole becomes empty due to the damping gel leaked to the outside, a small amount of damping gel does not adequately control the vibration of the wire, so that the servo performance of the objective lens is improved. When the object is contaminated due to the damping gel leaked to the outside significantly, the overall performance of the optical pickup actuator is deteriorated because the laser light is not clearly integrated in the disk.

The present invention has been made in view of this point, and an object of the present invention is to prevent the damping gel, which is a semi-liquid material injected into the holder gel, from leaking to the outside of the suspension PCB in order to appropriately control the vibration of the suspension wire.

This purpose is a suspension PCB in which a damping gel is injected into the through hole penetrated in the front and rear directions to damp the wire, and is fixedly coupled to the holder gel by a fixing screw on the back of the holder gel, and the end of the wire is soldered. An optical pickup actuator comprising: an inclined portion that is gradually narrowed in direct succession from the through hole of the holder gel, and is formed to be recessed in a predetermined depth in the back surface of the holder gel in succession to the inclined portion, A concave fitting groove in which an arc-shaped concave portion is formed, a plurality of fitting protrusions protruding forward of the suspension PCB so as to fit exactly in the concave fitting groove, and an outer circumferential surface of the fitting protrusion and an inner side of the recess fitting groove. Of the optical pickup actuator, characterized in that composed of a leakage blocking member to prevent the leakage of the damping gel Pinggel is accomplished by providing a leak-proof structure.

Hereinafter, on the basis of the accompanying drawings to explain the configuration of the present invention in detail.

4 is an exploded perspective view of the damping gel and the suspension PCB according to the present invention, Figure 5 is a cross-sectional view of the damping gel leak-proof structure in the present invention, the configuration of the present invention in the through hole 51 penetrated in the front and rear directions A damping gel 54 is injected into the holder gel 50 for damping the wire 80, and fixedly coupled to the rear surface of the holder gel 50 by a fixing screw 70, and an end of the wire 80 is fixed. In the optical pickup actuator consisting of a suspension PCB (60) to be soldered, the inclined portion 52 and the inclined portion 52 gradually narrows in diameter continuously in the through hole 51 of the holder gel 50, and the inclined portion ( 52 to be recessed in a predetermined depth on the back surface of the holder gel 50, and inserted into the concave fitting groove 53 having an arc-shaped concave portion formed on the inner wall thereof, and exactly fit into the concave fitting groove 53. A plurality of fitting stones formed to protrude forward of the suspension PCB 60 And a leakage blocking member 90 which is press-fitted into the outer circumferential surface of the fitting protrusion 61 and the inner surface of the recess fitting groove 53 to prevent leakage of the damping gel 54.

A hemispherical recess 64 is formed on the outer circumferential surface of the fitting protrusion 61 to prevent the leakage blocking member 90 from being fixed and flowing.

In addition, the narrowest portion of the inclined portion 52 formed on the holder gel 50 is within the range that does not interfere with the operation of the wire 80 when the wire 80 vibrates up, down, left and right. It is good to select the minimum diameter.

Hereinafter, the operation of the present disclosure will be described based on the accompanying drawings.

First, looking at the assembly process of the present invention, before injecting the damping gel 54 into the through hole 51 of the holder gel 50, the recess 64 formed on the outer peripheral surface of the fitting projection 61 of the suspension PCB 60 It is fixed by pressing the leakage blocking member 90 is a ring-shaped and an elastic material such as rubber.

Then, the fitting protrusion 61 of the suspension PCB 60 into which the leakage blocking member 90 is inserted is inserted into the recess fitting groove 53 formed on the rear surface of the holder gel 50, and then coupled to the hole of the suspension PCB 60. 63, the fixing screw 70 is inserted and fastened to the screw hole 55 of the holder gel 50 to fix the suspension PCB 60 to the back surface of the holder gel 50.

Then, the wire 80 is penetrated through the installation hole 62 of the suspension PCB 60 and the through hole 51 of the holder gel 50 in the assembled state in this way, and one end of the wire 80 is passed through the objective lens holder ( Solder fixing to both sides of the (not shown), and the other end of the wire 80 is solder fixed at the end of the suspension PCB 60 as shown in FIG.

Meanwhile, the optical pickup actuator is placed in a thermostat in a state in which the damping gel 54 in the semi-liquid state is injected into the through hole 51 of the holder gel 50 while the main parts of the optical pickup actuator are assembled. The high temperature hot air is blown to cure the damping gel 54 injected into the through hole 51 of the holder gel 50.

At this time, even if the hot gel is blown to the damping gel 54, the leakage blocking member 90 press-fitted to the outer circumferential surface of the fitting protrusion 61 of the suspension PCB 60 is exactly inside the fitting groove 53 of the holder gel 50. In the coupled state, the damping gel 54 is leaked between the coupling portion of the suspension PCB 60 and the holder gel 50 by the inclined portion 52 gradually narrowed toward the rear of the through hole 51. Will be prevented.

That is, since the leakage blocking member 90 is fitted into the recessed portion 64 of the fitting protrusion 61 and is pressed into the recessed portion of the inner wall surface of the recessed fitting groove 53, the damping gel 54 is never suspended. There is no leakage between the PCB 60 and the holder gel 50.

Therefore, in the related art, the damping gel leaks to the outside due to the improper coupling between the holder gel and the suspension PCB, and the leaked damping gel is buried in the main parts such as the objective lens to significantly reduce the servo performance of the optical pickup actuator. Otherwise, when the damping gel leak prevention structure according to the present invention is used, the damping gel, which is a semi-liquid material injected into the holder gel, is inserted into the recessed groove of the suspension PCB and the holder gel to appropriately control the vibration of the suspension wire. It is a very useful design to improve the servo performance of the optical pickup actuator by preventing the member from leaking out of the suspension PCB.

Claims (1)

A damping gel 54 is injected into the through hole 51 penetrating in the front and rear directions to damp the wire 80, and a fixing screw 70 on the rear surface of the holder gel 50. In the optical pick-up actuator consisting of a suspension PCB 60 fixedly coupled by the soldering, the end of the wire 80 is soldered, the diameter is gradually continued to the rear in the through-hole 51 of the holder gel 50 A concave fitting groove 53 which is formed to be inclined at a constant depth on the rear surface of the holder gel 50 and the inclined portion 52 narrowing to the inclined portion 52, and an arc-shaped concave portion is formed on the inner wall surface; A plurality of fitting protrusions 61 protruding forward of the suspension PCB 60 so as to fit exactly into the recess fitting grooves 53, and recesses 64 are recessed on the outer circumferential surface thereof, and the fitting protrusion 61. It is pressed into the outer peripheral surface of the recess 64 and the inner surface of the recess fitting groove 53 of the damping gel ( 54) Optical pickup actuator damping gel leakage prevention structure, characterized in that consisting of a leakage blocking member (90) to prevent leakage.