KR100211817B1 - A cd-dvd double optical pick-up device - Google Patents

Abstract

The present invention is to move the pickup portion fixing the hologram element from the lens holder to which the objective lens for CD and DVD is fixed to move to the objective lens for the disc to be reproduced, thereby reducing the moving radius of the lens holder and increasing the damping effect. The present invention relates to a CD-DVD combined optical pickup device.

According to the present invention, the lens holder unit 50 having the objective lens 54 for CD and the objective lens 56 for DVD is fixed to the yoke plate 65 by the suspension wire 64, and The case 82 in which the hologram element 90 is installed below the lens holder 52 of the lens driver 50 is rotatable about the rotation shaft 84 and the lens driver 50 of the lens driver 50. The yoke plate 65 and the rotary shaft 84 of the pickup 80 are composed of a pickup base 100 fixed thereto.

In the present invention, since the lens holder 52 moves only a distance for correcting the tracking error and the focusing error, the vibration of the lens holder 52 is reduced, so that the recording of the disc 110 can be reproduced in a stable state, and the suspension wire has low manufacturing cost. Since the lens holder 52 is floated and fixed at 64, the productivity of the optical pickup device can be improved.

Description

CD-DVD combined optical pickup

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD-DVD combined optical pickup device. In particular, a pickup unit having a hologram element is moved from a lower part of a lens holder to which a CD objective and a DVD objective are fixed to an objective lens suitable for a disc to be played. The present invention relates to a CD-DVD combined optical pickup device.

In general, a CD-DVD combined optical pickup device in which an objective lens for playing a compact disk and an objective lens for playing a digital video disk is fixed to a lens holder is fixed in a state in which a hologram element is fixed. Axial perturbation is mainly used in which the objective lens suitable for the disc to be reproduced is rotated and moved up and down along the axis of rotation in the optical path of the hologram element.

FIG. 1 is an actuator of an axially perturbation type optical pickup device having both a CD objective lens 24 and a DVD objective lens 22, wherein the lens holder 20 is formed by a rotating shaft 14 provided on the yoke plate 10. ) Is rotatably and vertically movable, and a CD objective lens 24 is fixed to one side of the lens holder 20, and is spaced apart from the CD objective lens 24 by a predetermined interval. The objective lens 22 for DVD is fixed at the same distance.

A hologram element (not shown) is installed below the lens holder 20 to irradiate a laser and receive reflected light and convert the reflected light into an electrical signal. The holographic elements 22 and 24 of the CD and DVD objectives 22 and 24 are disposed below the lens holder 20. Reflective mirrors are provided such that the hologram element is located or reflects the laser irradiated from the hologram element so as to be positioned vertically below the objective lenses 22 and 24 for CD and DVD.

Therefore, when playing a disc in which only sound is recorded, the lens holder 20 is rotated so that the CD objective lens 24 is positioned vertically above the hologram element, so that the laser light irradiated from the hologram element causes the CD objective lens 24 to rotate. The focal point is formed on the disc, and the lens holder 20 is rotated about the rotation axis 14 when the disc is recorded with the sound and the image, so that the objective lens 22 for the DVD is positioned vertically above the hologram element. The laser light irradiated from the element passes the DVD objective lens 22 and focuses on the disk, thereby enabling the recording of the disk to be reproduced.

On the other hand, the lens holder 20 is to be raised to a certain height on the yoke plate 10, the bottom surface of the lens holder 20 can rotate without friction on the yoke plate 10, for this purpose the lens holder 20 The magnetic holders 28 are fixed to two sides of the magnetic body 28 so as to be attracted to the attraction force of the magnet 12 fixed to the yoke plate 20 so that the lens holders 20 are raised to a certain height together. One of each of the magnetic bodies 28 is positioned at the center of each of the magnets 12 on both sides when the objective lens 22 for the DVD is positioned above the hologram element, and is attracted to the lens holder by the attraction force of the magnet 12. When the objective lens 24 for the CD is positioned above the hologram element, another pair of magnetic bodies 28 are positioned at the centers of the magnets 12 on both sides, so that the attraction force of the magnet 12 is increased. This causes the lens holder 20 to rise.

The magnetic body 28 not only serves to injure the lens holder 20, but also continues in the optical axis and tracking direction to form the laser focus in the state where the lens holder 20 is injured while using the actuator. When moving finely, the magnetic body 28 fixed to the lens holder 20 acts to reduce the negative resonance of the lens holder 20 by damping the lens holder 20 with a force attracted by the magnetic force of the magnet 12. have.

In addition, the magnetic body 28 fixed to the lens holder 20 is connected to the tracking coil 26 fixed to the lens holder 20 so that the lens holder 20 can change the positions of the objective lenses 22 and 24 for CD and DVD. When rotating the lens holder 20 by passing a temporary large current serves to find the correct position by fixing the lens holder 20 by the magnetic force of the magnet (12).

However, in the above-described axial perturbation optical pickup device, the lens holder 20 should move quickly about the rotation shaft 14, and friction occurs between the rotation shaft 14 and the lens holder 20, causing the lens holder 20 to move. In order to reduce the friction of the rotating shaft 14 to minimize the friction of the rotating shaft 14), the surface of the rotating shaft 14 is coated with Teflon to reduce the friction. Since the Teflon coating requires high technology and precision, processing cost is high. There is a high problem.

In addition, in the optical pickup device of the axial perturbation method, the magnetic body 28 fixed to the lens holder 20 is attracted to the magnetic force of the magnet 12 fixed to the yoke plate 20 to prevent the lens holder 20 from being displaced. And it acts as a damping to reduce the negative resonance generated in the lens holder 20, the magnet 12 when the lens holder 20 is rotated to change the position of the CD objective lens 24 and the DVD objective lens 22 It is difficult to quickly fix the lens holder 20 to which the magnetic body 28 is fixed, so that it takes some time for the lens holder 20 to find the correct position, and when the lens holder 20 is impacted from the outside, the lens holder 20 The magnet 12 pulls the magnetic body 28 to fix the lens holder 20 in a state in which the rotation of the 20 and the objective lens 24 for the CD and the objective lens 22 for the DVD are forcedly rotated. There is a problem that the playback of the disc is stopped.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems, and an object of the present invention is to move the pick-up unit fixing the hologram element from the lower side of the lens holder to which the CD and DVD objective lenses are fixed to the objective lens for the disc to be reproduced. Accordingly, to provide a CD-DVD combined optical pickup device for reducing the moving radius of the lens holder and increase the damping effect.

In order to achieve the above object, the present invention provides a lens driving unit for fixing a CD objective lens and a DVD objective lens to a yoke plate by a suspension wire, and a hologram element below the lens holder of the lens driving unit. It is characterized in that the case is provided with a pick-up unit rotatably installed around the rotation shaft, and a pickup base to which the yoke plate of the lens driving unit and the rotation shaft of the pickup unit are fixed.

1 is a perspective view showing a general axial perturbation optical pickup device.

2 is a schematic diagram showing an optical pickup apparatus according to the present invention;

3 is a perspective view showing an optical pickup device according to the present invention.

Figure 4 is a plan view showing the operation of the optical pickup apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

50 lens driver 52 lens holder

52: objective lens for CD 54: objective lens for CD

65 yoke plate 80 pickup section

82: case 84: axis of rotation

86: magnetic body 90: hologram element

92: reflection mirror 100: pickup base

102: Guide 104: Magnet

110: disc

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a CD-DVD combined optical pickup device according to the present invention will be described in detail.

First, as shown in FIGS. 2 and 3, the lens holder 52 fixing the CD objective lens 54 and the DVD objective lens 56 to the yoke 66 is suspended by the suspension wire 64. The lens drive unit 50 floating on the plate 65 and the case 82 in which the hologram element 90 is installed below the lens holder 52 of the lens drive unit 50 rotate about the rotational axis 84. It consists of the pick-up part 80 installed so that it is possible, the yoke plate 65 of the said lens drive part 50, and the pick-up base 100 to which the rotating shaft 84 of the pick-up part 80 was fixed.

The CD objective lens 54 and the DVD objective lens 56 are fixed to the lens holder 52 of the lens driving unit 50 at a predetermined distance from each other, and the focusing coil 60 and the lower portion thereof are fixed to the lens holder 52 of the lens driving unit 50. The tracking coil 62 is wound and bonded, and the coil PC 58 to which the focusing coil 60 and the tracking coil 62 are connected is fixed on the focusing coil 60 on both sides.

In the yoke plate 65 of the lens driving unit 50, a yoke 74 positioned inside the lens holder 52 is formed to provide a focusing coil 60 and a tracking coil 62 fixed to the lens holder 52. The magnet 76 providing the magnetic flux is fixed, and the gel holder 68 and the suspension PCB 70 in which the damping gel is injected are fixed to the yoke 66 formed on the other side of the yoke plate 65. Accordingly, a plurality of suspension wires 64 connected to the coil PC 58 pass through the inside of the gel holder 68 and are connected to the suspension PC 70 to lift the lens holder 52 from the yoke plate 65. At the same time, the current is applied to the suspension coil ratio 58 and the tracking coil 62 and the focusing coil 60 through the coil PC 58.

On the other hand, the pick-up unit 80 is rotatably fixed to the case 82 on the rotation shaft 84 formed on the pickup base 100, the hologram element 90 is provided inside the case 82, the hologram element ( A reflection mirror 92 is provided on the path of the laser light to irradiate the laser light of 90 to the upper objective lens 54 and the objective lens 56 for DVD. In addition, the fixing cap 85 is screwed to the upper end of the rotating shaft 84 in order to prevent the case 82 is separated from the rotating shaft 84.

In addition, in order to fix the case 82 to a predetermined point on the pickup base 100, a magnetic body 86 is formed on both sides of the case 82 so that the coil 88 is wound, and the case (on the upper surface of the pickup base 100) is provided. Guides 102 spaced apart from the magnetic body 86 formed at 82 by a predetermined distance are formed, and the magnets 104 are fixed to the respective guides 102.

Hereinafter, the operation of the optical pickup device having the above configuration will be described with reference to FIG.

First, when reproducing the disk 110 in which sound and video are recorded, a diagram of the magnet 104 fixed to the guide 102 formed on the pickup base 100 by applying current to the magnetic body 86 formed on both sides of the case 82. In the state in which the reflection mirror 92 installed in the case 82 is located vertically downward of the DVD objective lens 56 by causing the magnetic force of the polarity different from that of the magnet 104 below to be bonded to the magnet 104. The case 82 is fixed.

In this state, the laser beam is irradiated onto the hologram element 90 to form the focal point of the laser light on the disk 110 through the reflection mirror 92 and the objective lens 56 for the DVD, and the laser reflected from the disk 110. The light is received by the hologram element 90 in the opposite path, reproduces the recording of the disc 110 as an electrical signal, and delivers it to the microcomputer.

At this time, a tracking and focusing error of the laser light formed on the disk 110 occurs. To correct this, a current is applied to the suspension PCB 70 to track and focus the coil through the suspension wire 64 and the coil PC 58. When the electric current is transmitted to the 60 and 62, the driving force is generated in the lens holder 52 by the magnetic flux of the magnet 76 fixed to the yoke 74 of the yoke plate 65. By shifting in the tracking direction, an error in focus of the laser light formed by the objective lens 56 for DVD is corrected. At this time, since the lens holder 52 is floated by the suspension wire 64, it can vibrate freely, and since the unnecessary resonant interferes with recording and reproduction, the damping gel in which the suspension wire 64 is injected into the gel holder 68 is injected. By reducing the negative resonance, the recording of the disc 110 can be reproduced in a stable state in the objective lens 56 for DVD.

On the other hand, as described above, the reflection mirror 92 of the pickup unit 80 is located below the vertical direction of the DVD objective lens 56 of the lens holder 52 in order to reproduce the disc 110 on which only sound is recorded. By moving the mirror 92 vertically downward of the CD objective lens 54, the laser light irradiated from the hologram element 90 passes through the CD objective lens 54 to reproduce the disc 110.

At this time, the opposite current is applied to the coil 88 wound on the magnetic body 86 formed on the case 82 to generate a repulsive force between the magnetic body 86 formed below the case 82 and the magnet 104 below. A magnetic force is generated between the magnetic body 86 formed above the case 82 and the upper magnet 104 so that the case 82 rotates upward with respect to the rotation shaft 84 to form a magnetic body formed above the case 82 ( The 86 is attached to the upper magnet 104, so that the reflective mirror 92 provided in the case 82 is fixed in a state located vertically below the CD objective lens 54. As shown in FIG.

In this state, the laser beam is irradiated onto the hologram element 90 to form a focus of the laser light on the disk 110 through the reflection mirror 92 and the objective lens 54 for the CD, and the laser light reflected from the disk 110. Is received by the hologram element 90 in the opposite path, and the recording of the disc 110 is reproduced as an electric signal and transferred to the microcomputer.

At this time, a tracking and focusing error of the laser light formed on the disk 110 occurs. To correct this, a current is applied to the suspension PCB 70 of the lens driving unit 50 so that the suspension wire 64 and the coil PCB 58 can be used. When current is transmitted to the tracking and focusing coils 60 and 62 through the lens holder 52, the driving force is generated by the magnetic flux of the magnet 76 fixed to the yoke 74 of the yoke plate 65. 52 is moved in the optical axis and tracking directions to correct an error in focus of the laser light formed in the objective lens 54 for the CD. At this time, since the lens holder 52 is floated by the suspension wire 64, it can vibrate freely, and since the unnecessary resonant interferes with recording and reproduction, the damping gel in which the suspension wire 64 is injected into the gel holder 68 is injected. By reducing the negative resonance, the recording of the disc 110 can be reproduced in a stable state in the objective lens 54 for the CD.

As described in the above embodiments, the present invention allows the lens holder 52 to which the CD objective lens 54 and the DVD objective lens 56 are fixed to the yoke plate 65 by the suspension wire 64. The pick-up unit 80 provided with the reflection mirror 92 and the hologram element 90 so as to be rotatable by the rotation shaft 84, and to the disc 110 to be reproduced from under the lens holder 52. As an optical pickup device for moving to a suitable objective lens, since the lens holder 52 only moves a distance for correcting a tracking error and a focusing error, the vibration of the lens holder 52 is reduced to reproduce the recording of the disc 110 in a stable state. In addition, since the lens holder 52 is floated and fixed by the suspension wire 64 having a low manufacturing cost, the productivity of the optical pickup device can be improved.

Claims (5)

An optical pickup apparatus for reproducing CDs and DVDs, A lens drive unit 50 in which the CD objective lens 54 and the DVD objective lens 56 are fixed to the yoke plate 65 by a suspension wire 64, and the lens drive unit ( A pickup 82 provided with a hologram element 90 below the lens holder 52 of the 50 so as to be rotatable about the rotational shaft 84, and a yoke plate of the lens driver 50 ( 65) and the CD-DV combined actuator, characterized in that consisting of the pickup base 100 is fixed to the rotary shaft (84) of the pickup (80). The focusing coil 60 and the tracking coil 62 are wound and bonded to the lens holder 52 of the lens driver 50, and the focusing coil 60 and the inside of the lens holder 52. A CD-DVD combined optical pickup device, characterized in that a magnet (76) providing magnetic flux to the tracking coil (62) is fixed to a yoke (74) formed in the yoke plate (65). The gel holder 68 in which the damping gel is injected is installed in the yoke 66 formed on the yoke plate 65 and fixed to the lens holder 52 in the lens driving unit 50. Suspension PC 70 fixed at the yoke 66 via a damping gel injected into the gel holder 68 has a suspension wire 64 having one end connected to the coil PC 58 connecting the 62 and the focusing coil 60. CD-DVD combined optical pickup device characterized in that the other end is connected to). According to claim 1, wherein the case 82 of the pick-up unit 80, the magnetic body 86 is formed on both sides of the coil 88 is wound, the upper surface of the pick-up base 100 is constant with the magnetic body 86 CD-DVD combined optical pick-up device, characterized in that a pair of guides (102) which are spaced apart the magnet 104 is fixed. The optical pickup apparatus of claim 1, wherein a fixing cap (85) is screwed to an upper end of the rotating shaft (84) to prevent the case (82) from escaping upward.