KR20000012246U - Damping Structure of Optical Pickup Actuator Using Inertia - Google Patents

Abstract

The present invention aims to shorten the signal loss time by rapidly reducing the vibration even when low frequency vibration is applied in the vertical and horizontal directions of the lens holder.

The present invention is a gel holder 20 having a silicone gel 26 fixed to the yoke and in contact with the suspension wire 30, a plurality of vertical cavities 50 formed in the optical axis direction in the lens holder 40, A first spring 53 inserted into each vertical cavity 50, a first spring 51 and a second spring 53 installed on both sides of the first ball 53 in the vertical cavity 50, and A plurality of horizontal cavities 54 formed in the radial direction of the disc in the lens holder 40, a second ball 57 inserted into each horizontal cavity 54, and a second ball in the horizontal cavity 54; A damping structure including a third spring 55 and a fourth spring 56 provided on both sides of the 57, and a high frequency wave that is finely and quickly shaken by the silicon gel 26 in contact with the suspension wire 30. Vibration of the low frequency and low frequency oscillation caused by the first ball 53 and the second ball 57 injected into the horizontal cavity 54 and the vertical cavity 50 Since chain, it is possible to reduce the signal loss time at which the lens holder 40 is quickly and reliably stop the recording and reproducing of the disc.

Description

Damping Structure of Optical Pickup Actuator Using Inertia

The present invention relates to a damping structure of an optical pickup actuator using inertia, and in particular, by forming a cavity in the vertical direction and a horizontal direction in the lens holder, and inserting a ball supported by a spring into each cavity to generate an inertial force. The present invention relates to a damping structure of an optical pickup actuator using inertia for shortening a signal loss time by rapidly reducing the vibration even when low frequency vibration is performed in the vertical direction and the horizontal direction.

In general, the optical pickup actuator moves the objective lens in the radial direction when the error of the optical axis or the radial direction occurs at the focal point of the laser beam formed on the recording pit of the disc through the objective lens in the hologram element. It is used as a driving means for correcting the error of the focus of the laser beam by finding the, and adjusting the size of the focus by moving in the focus direction.

A wire driving actuator generally used among these optical pickup actuators is shown in FIG. 1.

The actuator has a shape in which the lens holder 140 fixing the objective lens 142 is installed to the yoke 110 with a suspension wire 130 so as to be movable. The objective lens 142 is located at the center of the lens holder 140. ), And a focusing coil 144 was wound around the lens holder 140, and then a tracking coil 146 wound in a rectangular shape on the front was attached thereto. The coil PC 148 was fixed to both sides of the lens holder 140 to connect the tracking coil 146 and the focusing coil 144.

In addition, the yoke 110 forms a pair of symmetrical outer bent pieces 114 and attaches and fixes the magnet 118 for generating an electromagnetic force by applying magnetic flux to the tracking coil 146 and the focusing coil 144. A pair of inner bent pieces 112, which are symmetrical to the inside of the outer bent piece 114, is bent upwardly at the yoke 110 to induce the flow of magnetic flux in the magnet 118, whereby the magnetic flux of the magnet 118 A magnetic closure circuit was formed to strongly pass the tracking coil 146 and the focusing coil 144 horizontally, pass through the planes of the inner bent piece 112 and the yoke 110, and enter the magnet 118.

In addition, a second bent piece 116 is formed at one edge of the yoke 110 to fix the gel holder 120 and the suspension PCB 122 with screws 124, and one end of the suspension wire 130 is fixed to the lens holder. By connecting the coil PC 148 attached to the 140 and the other end to the suspension PCB 122, the lens holder 140 is lifted and installed by the suspension wire 130, and the suspension PCB from the signal processing unit The current applied to 122 is caused to pass through the suspension wire 130 to the tracking coil 146 and the focusing coil 144.

In addition, the suspension wire 130 passes through the inside of the gel holder 120 and injects a viscous silicon gel 126 into the inside of the gel holder 120, thereby subsidiary resonance of the suspension wire 130 to the silicon gel. It quickly decreased to a viscous force of 126. Since the silicon gel 126 has a high viscosity coefficient, the suspension wire 130 is effective in reducing the vibration of the high frequency, which is fine and fast shaking.

Therefore, the silicon gel 126 reduces the vibration of the high frequency generated while the lens holder 30 is driven by driving the suspension wire 30 from the outside to the lens holder 140, thereby reducing the objective lens 142. The laser beam passing through the ()) was stabilized so that the recording of the disc was well reproduced.

However, when the optical pickup actuator as described above is mounted on a CD player installed in an impact place such as a car, when the large and slow vibration is applied from the outside, the lens holder 140 supported by the suspension wire 130 is greatly enlarged vertically or horizontally. Since the low-frequency vibration is flowing, the laser beam passing through the objective lens 142 fixed to the lens holder 140 instantaneously deviates from the recording feet of the disc.

In this case, since the silicone gel 126 in contact with the suspension wire 130 has a large viscosity, the vibration of the low frequency at which the suspension wire 130 is large and slowly tremble is not effectively reduced. Therefore, the conventional actuator cannot reproduce the recording of the disc until the lens holder 140 is stabilized, and thus there is a problem that the signal loss time is long.

The present invention is devised to improve the conventional problems, the object of the present invention is to reduce the signal loss time by rapidly reducing the vibration even when the low frequency vibration in the lens holder in the vertical and horizontal directions It is for.

1 is a perspective view showing a general optical pickup actuator.

2 is a perspective view of a lens holder according to an embodiment of the present invention.

Figure 3a, 3b is a side cross-sectional view showing the action of the lens holder according to an embodiment of the present invention.

Figure 4a, 4b is a cross-sectional view showing the action of the lens holder according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

20: gel holder 26: silicone gel

30: suspension wire 40: lens holder

50: vertical cavity 51: first spring

52: second spring 53: first ball

54: horizontal cavity 55: third spring

56: fourth spring 57: second ball

The present invention for achieving the above object, a gel holder containing a lens holder for fixing the objective lens, a yoke for supporting the lens holder with a suspension wire, and a silicone gel fixed to the yoke in contact with the suspension wire An optical pickup actuator provided with a holder; A plurality of vertical cavities formed in the lens holder in the optical axis direction; First balls inserted into the respective vertical cavities; First and second springs respectively installed at both sides of the first ball in the vertical cavity; A plurality of horizontal cavities formed in the lens holder in the radial direction of the disk; Second balls inserted into the respective horizontal cavities; And third and fourth springs respectively installed at both sides of the second ball in the horizontal cavity.

This damping structure reduces the vibration of the lens holder by generating an inertial force in the optical axis direction of the objective lens and the radial direction of the disc, respectively, when the first and second balls inserted into the cavity are vibrated when the lens holder vibrates greatly.

Therefore, the lens holder quickly stabilizes the lens holder even in the vibration of the low frequency region, so that the focus of the laser beam passing through the objective lens can quickly find the recording pit of the disc, thereby reducing the signal loss time.

Hereinafter, the present invention will be described in more detail with reference to the preferred embodiments of the present invention.

First, as shown in a perspective view so that the inside of the lens holder in FIG. 2 is perspective, the embodiment of the present invention has a lens holder 40 for fixing the objective lens 42 and the lens holder 40 with a suspension wire 30. Optical pickup having a supporting yoke (not shown; same as '110' of FIG. 1) and a gel holder 20 having a silicone gel 26 fixed to the yoke and in contact with the suspension wire 30 Applied to the actuator.

Here, a plurality of vertical cavities 50 are formed in the lens axis 40 in the optical axis direction, and the first balls 53 are inserted into the vertical cavities 50. Then, the first spring 51 and the second spring 53 are installed on both sides of the first ball 53 in the vertical cavity 50, and the vertical cavity 50 is closed.

In addition, a plurality of horizontal cavities 54 are formed in the lens holder 40 in the radial direction of a disc (not shown), and a second ball 57 is inserted into each of the horizontal cavities 54. Then, the third springs 55 and the fourth springs 56 are provided at both sides of the second ball 57 in the horizontal cavity 54, and the horizontal cavity 54 is closed.

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

When the CD player in which the optical pickup actuator of the present embodiment is installed is installed in an automobile or the like, the vibration of the high frequency transmitted from the engine is rapidly reduced by the viscous force of the silicon gel 26 in contact with the suspension wire 30, so that the lens holder 40 Is stabilized. In addition, the negative resonance generated during the driving of the lens holder 40 in the tracking direction and the focusing direction is also rapidly reduced by the viscous force of the silicon gel 26.

On the other hand, when a large amplitude and slow vibration is applied to the optical pickup actuator, such as when a vehicle passes through a curved portion of the road, the low frequency at which the lens holder 40 supported by the suspension wire 30 flows largely up and down or left and right. Will vibrate.

At this time, the damping fluids 52 and 56 filled in the vertical cavity 50 and the horizontal cavity 54 of the lens holder 40 damp the lens holder 40 by inertia. Explain.

FIG. 3A is a side cross-sectional view of the lens holder 40 and the gel holder 20. The lens holder 40 is inserted into the vertical cavity 50 when the lens holder 40 suddenly flows largely downward based on the drawing. The ball 53 stays in place by inertia and compresses the upper first spring 51 to reduce the amplitude of the lens holder 40. On the contrary, as shown in FIG. 3B, when the lens holder 40 flows upward with reference to the drawing, the first ball 53 compresses the lower second spring 52 by inertia and thereby the lens holder 40. Reduces the amplitude of

This phenomenon occurs continuously while the lens holder 40 vibrates, so that the lens holder 40 is quickly stabilized by the optical axis direction vibration attenuation action of the first ball 53.

4A is a view showing the planar cross-sections of the lens holder 40 and the gel holder 20. The lens holder 40 is inserted into the horizontal cavity 54 when the lens holder 40 suddenly flows large downwardly. The two balls 57 stay in place by inertia and compress the upper third spring 55 based on the drawings to reduce the amplitude of the lens holder 40. On the contrary, when the lens holder 40 flows upward as shown in FIG. 4B, the second ball 57 compresses the lower fourth spring 56 by inertia to reduce the amplitude of the lens holder 40. Let's do it.

Since this phenomenon occurs continuously while the lens holder 40 vibrates, the lens holder 40 is quickly stabilized by the radial vibration damping action of the second ball 57.

As described above, the optical pickup actuator of the present embodiment is attenuated by the silicon gel 26 which is in contact with the suspension wire 30 and the vibration of the high frequency which is shaken finely and rapidly is injected into the vertical cavity 50 and the horizontal cavity 54. Large and slow tremors of low frequency vibration are attenuated by the first ball 53 and the second ball 53. Therefore, after the focus of the laser beam misses the recording pit of the disc, the lens holder 40 is stabilized quickly, so that the recording pit can be quickly found to reproduce the signal.

As described in the above embodiment, the subject innovation is formed in the optical axis direction in the lens holder 40 and the gel holder 20, which is embedded in the silicone gel 26 fixed to the yoke and in contact with the suspension wire 30 A plurality of vertical cavities 50, the first ball 53 is inserted into each vertical cavity 50, and the first spring 51 is provided on both sides of the first ball 53 in the vertical cavity 50, respectively ) And a second spring 53, a plurality of horizontal cavities 54 formed in the radial direction of the disk in the lens holder 40, a second ball 57 inserted into each of the horizontal cavities 54, A damping structure including a third spring 55 and a fourth spring 56 respectively provided on both sides of the second ball 57 in the horizontal cavity 54, wherein the silicon gel is in contact with the suspension wire 30. The vibration of the high frequency, which is trembling finely and rapidly, is attenuated by the first and second balls 53 and 57, which are injected into the horizontal cavity 54 and the vertical cavity 50. Since the vibration of the low frequency which is trembling slowly is attenuated, the lens holder 40 can be stabilized quickly, thereby reducing the signal loss time at which recording and reproduction of the disc are stopped.

Claims (1)

A lens holder 40 for fixing the objective lens 42, a yoke for supporting the objective lens 42 with a suspension wire 30, and a silicone gel fixed to the yoke and in contact with the suspension wire 30 ( An optical pickup actuator comprising a gel holder 20 having a built-in 26; A plurality of vertical cavities 50 formed in the lens axis 40 in the optical axis direction; First balls (53) inserted into the respective vertical cavities (50); First springs (51) and second springs (53) installed on both sides of the first ball (53) in the vertical cavity (50), respectively; A plurality of horizontal cavities (54) formed in the radial direction of the disk in the lens holder (40); A second ball 57 inserted into each of the horizontal cavities 54; And Damping structure of the optical pickup actuator using inertia, characterized in that it comprises a third spring 55 and the fourth spring 56 which are respectively installed on both sides of the second ball (57) in the horizontal cavity (54) .