KR19980030544A - Tracking stabilization device and method for optical disc player - Google Patents

Abstract

The present invention relates to an apparatus and method for tracking stabilization of an optical disc player.

To this end, in the present invention, when the optical pickup unit 10 needs to be jumped to a predetermined distance, the present invention is fixed to the pick-up actuator 13 constituting the optical pickup unit 10 to inertia according to the movement of the optical pickup unit 10. The pickup actuator 13 is prevented from vibrating so that the tracking servo can be made quickly when the optical pickup portion 10 reaches a desired target point.

Therefore, the present invention has the effect that even when the pickup is transported at a long distance, a desired function can be executed without delay of the tracking servo due to the vibration of the pickup.

Description

Tracking stabilization device and method for optical disc player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tracking servos in optical disc players, and more particularly, to an apparatus and method for tracking stabilization of optical disc players to enable tracking servos within a short time after stabilizing pickup after installing tracks over long sections.

Conventional optical disc players include compact disk players (CDP), laser disk players (LDP), compact disk graphic players (CDGP), and video compact disk players (VCDP: video). A compact disk player is developed and used. In general, a compact disk player is a device capable of playing audio only, and a laser disk player, a compact disk graphic player, and a video compact disk player are devices capable of simultaneously playing video and audio.

Recently, digital viedo disks (DVDs) using MPEG-2 moving picture compression technology have been developed, which have a gigabytes (GB) capacity including moving pictures in a 12 cm optical disc such as a current CD. It is possible to record and play back data and to continue to improve its performance.

On the other hand, such optical disc players reproduce images and / or audio recorded on an optical disc and output them through a screen and / or a speaker, and have lower signal quality due to a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatuses. And / or can reproduce signals with sound quality, generate no noise due to irregular reproduction and modulation, very little distortion, no ghosts, and random access, so that they can be rapidly developed and widely distributed. There is a trend.

On the other hand, in such an optical disc player, optical is used to read data recorded on the disc. In order to accurately read the data recorded on the optical disc, reproduction must be performed while accurately following a track of a pitch formed on the optical disc. .

In other words, during playback, tracking control must be made to accurately follow the track of the optical disk on which the light rotates. If such tracking control is not performed smoothly, light reading data may be displaced to other tracks due to impact or disturbance during playback, and sound may be cut off or the screen may be blurred.

Among such optical disc players, a compact disc (CD) player and a video compact disc (VCD) player will be described as an example.

CD players and VCD players have a tracking servo device that accurately tracks 1.6μm pitch tracks formed by recording data on CDs and VCDs, and must also be compensated by tracking servos on CD and VCD players. ± 70 μm is determined in consideration of the eccentricity that occurs when the disc is manufactured and when the disc is mounted in the player. In the case of tracking servo, it should be suppressed up to ± 0.1 μm of such eccentricity of ± 70 μm.

On the other hand, such an optical disc player is equipped with various functions for jumping a pickup by a predetermined distance to search for a desired point and executing a predetermined function from that point.

For example, there is a built-in selective playback function for searching and playing a desired track. When a user enters a desired track number, the pickup is transferred to the track for playback. In this case, the track to be searched may occur at a predetermined distance from the current pickup position. In this case, since the pickup is moved at a high speed at a high speed, the pickup may be carried out by inertia or the like even after arriving at a desired track point. In particular, there is a problem that the pick-up actuator may vibrate and may act as an obstacle for executing the tracking servo quickly.

As shown in FIG. 1, when the pickup member 12 mounted to move in the pickup base 11 moves a predetermined distance to search for a predetermined track on the disk D, vibration due to inertia occurs. Thus, in particular, the finely moving pickup actuator 13 is shaken in the left and right direction, which affects the execution of the tracking servo immediately, and thus the regeneration cannot be performed quickly.

Accordingly, the present invention has been proposed to solve this problem in the prior art, and an object of the present invention is to pick up caused by inertia when the pickup moves a long distance to search and play back a desired track in an optical disc player. The stabilization of the optical disc player and the stabilization method of the optical disc player to enable fast playback even when the long jump of the pickup to search the track over a long distance by stabilizing the vibration of the To provide.

According to a preferred embodiment of the present invention for achieving the above object, a long jump of an optical pickup unit for reading data recorded from a disc to execute a selective playback function for searching for a desired track and executing playback, etc. A tracking stabilization apparatus for an optical disc player for quickly tracking servo when a long jump is performed, wherein the optical pickup unit includes a pickup member, a pickup base mounted to move the pickup member in a horizontal direction, and the pickup. And a pick-up actuator mounted on the upper surface of the member and finely moving in the horizontal direction, wherein the key input unit provides a function key signal for the selective regeneration, and the function key signal such as the selective regeneration from the key input unit. If provided, transfer the optical pickup to the desired playback position accordingly. A microcomputer for generating a driving control signal for generating a driving control signal, and generating a first and second switching control signals according to the present invention, a tracking error detection unit for detecting and outputting a tracking error signal from an output signal of the optical pickup unit, and the tracking error detection unit A compensator for detecting and outputting a tracking compensation signal according to a tracking error signal provided by the compensator; a reference voltage generator for generating a reference voltage for fixing the pickup actuator constituting the optical pickup; A first switching unit which is switched according to a switching signal and passes or blocks an output signal of the compensation unit, and which is switched according to a second switching signal provided by the microcomputer to pass or block a reference voltage provided from the reference voltage generator And a second switching unit to be provided from the microcomputer The servo is driven in accordance with a drive control signal to move the pickup member to a position of a track to be reproduced, and the tracking servo is moved finely in the left and right directions according to the compensation signal provided from the compensation unit through the first switching unit. And a drive unit driven according to the reference voltage provided from the reference voltage generator through the second switching unit to fix the pickup actuator.

According to another preferred embodiment of the present invention for achieving this object, a pick-up member and a pick-up base are mounted so that the pick-up member can move in a horizontal direction in order to perform a selective play function or the like for installing a desired track to perform play. And a pickup actuator mounted on the upper surface of the pickup member and moving finely in the horizontal direction, so as to quickly track an optical pickup unit for reading a data recorded from the disk by a long distance. A tracking stabilization method for an optical disc player for performing a servo, comprising the steps of: (a) determining whether an input function key signal is a key signal that requires a long jump of the optical pickup unit when a predetermined function key signal is input; (B) The input key signal in step (a) requires long jump of the optical pickup unit. If the key signal is obtained, turn off the tracking servo, fix the pickup actuator, and transfer the optical pickup unit to the target point according to the key signal; and (c) determine whether the optical pickup unit has reached the target point, and then track it. Turning on the servo and driving the pickup actuator to perform a tracking servo; and (d) performing an operation according to the function key signal input in step (a).

1 is a diagram for explaining the movement of an optical pickup section on a disc;

2 is a block diagram of a tracking stabilization apparatus of an optical disc player according to a preferred embodiment of the present invention.

3 is a detailed flowchart of a tracking stabilization method of an optical disc player according to another preferred embodiment of the invention.

* Description of the symbols for the main parts of the drawings *

10: optical pickup section 11: pick-up base

12: Pickup member 13: Pickup actuator

20: tracking error detection unit 30: compensation unit

40, 50: switching unit 60: reference voltage generating unit

70: microcomputer 80: key input unit

D: Disk

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a tracking stabilization apparatus of an optical disc player according to a preferred embodiment of the present invention.

As shown in FIG. 2, the tracking stabilization apparatus of the optical disc player according to the present invention includes a pickup member 12, a pickup base 11 mounted to allow the pickup member 12 to move in a horizontal direction, and a pickup member ( And a pickup actuator 13 mounted on the upper surface of 12) to finely move in the horizontal direction to execute the tracking servo, wherein the optical signal is read by performing optical pickup from the disk D. Is provided by the optical pick-up unit 10 for converting and outputting a signal, a key input unit 80 for providing a function key signal for selective reproduction, etc., and a predetermined function key signal such as a selective reproduction key signal from the key input unit 80. When the optical pickup unit 10 generates a drive control signal for transferring the optical pickup unit 10 to a desired reproducing position according to the input key signal, the optical pickup unit 10 is moved by a long jump by a predetermined distance. 1 and 2nd A microcomputer 70 for generating a control signal, a tracking error detector 20 for detecting and outputting a tracking error signal from a radio frequency (RF) signal provided from the optical pickup unit 10, and a tracking error detector 20 A reference voltage for fixing the compensation unit 30 that detects and outputs a tracking compensation signal for tracking servo according to the tracking error signal provided from the optical pickup unit 10, and the pickup actuator 13 constituting the optical pickup unit 10. Provided from the reference voltage generator 60 and the first switching unit 40 which is switched according to the first switching signal provided from the microcomputer 70 to pass or block the output signal of the compensation unit, and the microcomputer 70. A second switching unit 50 which switches according to the second switching signal to be passed or cuts the reference voltage provided from the reference voltage generator 60, and the driving control provided from the microcomputer 70. Driven according to an arc to move the pickup member 12 to the position of a desired track to be reproduced, and the pickup actuator 13 in a left or right direction according to a compensation signal provided from the compensation unit 30 through the first switching unit. It is configured to include a driving unit to finely move the tracking servo, and also to be driven according to the reference voltage provided from the reference voltage generator 60 through the second switching unit to fix the pickup actuator 13.

The optical pickup 10 picks up the light reflected from the disk D, converts the light into an electrical signal, and provides the RF error signal to the tracking error detection unit 20. The pickup member 12 and the pickup member 12 are horizontal. And a pickup actuator 11 mounted on the upper surface of the pickup member 12 so as to be movable in the direction, and a pickup actuator 13 which is finely moved in the horizontal direction to perform tracking servo.

The key input unit 80 provides a function key signal to the microcomputer 70 for executing a predetermined function such as selective playback.

In addition, the microcomputer 70, when a predetermined function key signal such as a selective playback key signal is provided from the key input unit 80, drive control for transferring the optical pickup unit 10 to a desired playback position according to the input key signal. A signal is generated by the driver 80, and when the optical pickup unit 10 is moved by a long jump by a predetermined distance, the first and second switching control signals are transferred to the first switch unit 40 and the second. Occurs with switching 50.

The tracking error detector 20 detects a tracking error signal from a radio frequency (RF) signal that is picked up by the optical picker 10 and converted into an electrical signal, and outputs the tracking error signal to the compensation unit 30. 30 detects a tracking compensation signal that allows a tracking servo to be performed according to a tracking error signal provided from the tracking error detector 20, and then provides the compensation signal to the driver 80 through the first switching unit 40. .

In addition, the reference voltage generator 60 provides a reference voltage for fixing the pickup actuator 13 constituting the optical pickup unit 10 to the driver 80 through the second switching unit 50. The reference voltage generator 60 and the first switching unit 40 are switched according to the first switching signal provided from the microcomputer 70 to provide or block the output signal of the compensator 30 to the driver 80. The second switching unit 50 is switched according to the second switching signal provided from the microcomputer 70 to provide or block the reference voltage output from the reference voltage generator 60 to the composition unit 80. The first switching unit 40 and the second switching unit 50 may be configured as transistors.

The drive unit 80 is driven according to a drive control signal provided from the microcomputer 70 to move the pickup member 12 to a desired track position to be reproduced, and from the compensator 30 to the first switching unit 40. The tracking servo is made by finely moving the pickup actuator 13 in the left or right direction according to the compensation signal provided through the driving signal, and is driven according to the reference voltage provided from the reference voltage generator 60 through the second switching unit. To fix the pickup actuator 13.

On the other hand, according to the present invention, when a predetermined function key signal is input from the key input unit 80, the microcomputer 80 firstly transmits the optical pickup unit 10 by a predetermined distance, for example. After the optical pickup unit 10 is transported, it is determined whether the pickup actuator 13 is a function key signal to be conveyed by a distance enough to vibrate by inertia, for example, a function key signal such as selective regeneration. do. At this time, if the input function key signal is a function key signal requiring a 'long jump' to transport the optical pickup unit 10, that is, the pickup member 12 by a predetermined distance, the first switching unit 40 The control signal is generated to switch 'off' and the second switching unit 50 generates the control signal to be switched 'on'.

Accordingly, since the first switching unit 40 is turned off, the compensation signal provided from the compensation unit 30 to the driving unit 80 through the first switching unit 40 is cut off at the switching unit 40, and the driving unit ( 30 stops driving for the tracking servo, and the second switching unit 50 is turned on to provide the reference voltage signal output from the reference voltage generator 60 to the driver 80. Configures the optical pickup unit 10 to fix the pickup actuator 13.

In addition, the microcomputer 70 generates a driving control signal to the driving unit 80, and accordingly, the driving unit 80 inputs the optical pick-up unit 10, that is, the pickup member 12 to the desired target according to the input key signal. Driven to a position. At this time, since the pickup actuator 13 is fixed by driving of the driving unit 80 according to the reference voltage of the reference voltage generator 60, the optical pickup unit 10 moves to a desired target position so that vibration due to inertia does not occur. Will not.

After that, when the optical pickup unit 10 reaches the desired target position by driving the driving unit 80, the microcomputer 70 again switches to the first switching unit 40 and the second switching unit 50 to control signals. In this case, the first switching unit 40 is turned on and the second switching unit 50 is turned off.

Accordingly, the driving unit 80 drives the pickup actuator 13 in the left or right direction according to the compensation signal of the compensation unit 30 provided through the first switching unit 40, so that the tracking servo is performed. Is performed, the operation according to the input function key signal, for example, playback is executed.

3 is a flowchart of a tracking stabilization method of an optical disc player according to a preferred embodiment of the present invention.

When a predetermined function key signal is input in step S10, the microcomputer 70 determines whether the input key signal is a key signal requiring a long jump for remotely transporting the optical pickup unit 10. If the key signal input in step S10 is a key signal requiring a long jump, in step S20, the microcomputer 70 turns off the tracking servo by turning off the first switching unit 40, and the second switching unit 50. On) to fix the pickup actuator (13).

Thereafter, in step S30, the optical pickup unit 10, i.e., the pickup member 12 is transferred to a desired target position according to the input key signal, wherein the pickup actuator 13 is fixed in step S20. It is not affected by inertia.

In step S40, it is determined whether the pickup member 12 has reached a desired target position. When the pickup member 12 reaches the desired target position in step S40, the process proceeds to step S50. In step S50, the first switching unit 40 is turned on and the second switching unit 50 is turned off to track. The servo is made, and in step S60, a function according to the function key signal input in step S10 is executed.

As described above, the present invention fixes the pickup actuator which vibrates by inertia when the pickup is transported remotely according to a predetermined function key signal. There is an effect that the desired function can be executed without delay of the tracking servo.

Claims (5)

In order to perform a fast-tracking servo when the optical pickup unit 10 that reads the recorded data from the disc is long jumped by a predetermined distance in order to perform a selective playback function for executing playback by installing a desired track, etc. In the tracking stabilization device of an optical disc player for The optical pick-up part 10 is provided with a pickup member 12, a pickup base 11 mounted to allow the pickup member 12 to move in a horizontal direction, and mounted on an upper surface of the pickup member 12 horizontally. A pickup actuator 13 and configured to finely move in a direction, A key input unit (80) for providing a function key signal for the selective reproduction and the like; When a function key signal such as the selective regeneration is provided from the key input unit 80, a driving control signal for transferring the optical pickup unit 10 to a desired regeneration position is generated accordingly, and accordingly the first and second A microcomputer 70 generating a switching control signal; A tracking error detector 20 which detects and outputs a tracking error signal from the output signal of the optical pickup unit 10; A compensator (30) for detecting and outputting a tracking compensation signal according to a tracking error signal provided from the tracking error detector (20); A reference voltage generator (60) for generating a reference voltage for fixing the pickup actuator (13) constituting the optical pickup (30); A first switching unit 40 switched according to a first switching signal provided from the microcomputer 70 to pass or block an output signal of the compensation unit; A second switching unit 50 which is switched according to the second switching signal provided from the microcomputer 70 to pass or block the reference voltage provided from the reference voltage generator 60; Driven according to the drive control signal provided from the microcomputer 70 to move the pickup member 12 to the position of the track to be reproduced, provided from the compensation unit 30 through the first switching unit 40 According to the compensation signal, the pickup actuator 13 is moved finely in the left and right direction so that the tracking servo is performed, and the reference voltage provided from the reference voltage generator 60 through the second switching unit 50 is applied. And stabilizing the pick-up actuator (13). The method of claim 1, And the first and second switching units (40,50) are made of transistors. The method of claim 1, The microcomputer 70 turns off the first switching unit 40 and turns on the second switching unit 50 when the optical pickup unit 10 is transferred to a desired target position according to the input key signal. Tracking stabilization device for optical disc players. The method of claim 1, The microcomputer 70 turns on the first switching unit 40 and turns off the second switching unit 50 when the optical pickup unit 10 reaches the desired target position according to the input key signal. Tracking stabilization device for optical disc players. The pickup member 12, the pickup base 11 mounted so that the pickup member can move in the horizontal direction, and the pickup member 12, in order to execute a selective playback function for searching for a desired track and executing playback. A long jump of the optical pickup unit 10 mounted on the upper surface of the optical pickup unit 13, the pickup actuator 13 being finely moved in the horizontal direction, for reading the data recorded from the disk D by a predetermined distance. In the tracking stabilization method of the optical disc player to make the tracking servo quickly, (A) determining whether the input function key signal is a key signal which requires a long jump of the optical pickup unit when a predetermined function key signal is input; (B) If the input key signal in step (a) is a key signal for requesting a long jump of the optical pickup unit, the tracking servo is turned off, the pickup actuator is fixed, and the optical pickup unit is moved to a target point according to the key signal. Transferring; (C) turning on the tracking servo and driving the pickup actuator when the optical pickup unit has reached the target point to perform the tracking servo; And (d) performing an operation according to the function key signal input in step (a).