KR970017243A

KR970017243A - Track Jump Control System in Optical Disc Playback System

Info

Publication number: KR970017243A
Application number: KR1019950032689A
Authority: KR
Inventors: 김준식
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-09-29
Filing date: 1995-09-29
Publication date: 1997-04-30

Abstract

본 발명은 슬레드 모터에 의한 광픽업의 고속 트랙점프시에 슬레드 모터의 회전속도와 광픽업의 이동속도에 따른 출력파형의 위상을 비교하여 위상 차이를 보상함에 의해, 트랙킹 코일의 트랙킹 동작을 제어하여 대물렌즈가 트랙킹 방향으로 진동하는 것을 방지하기 위한 광디스크재생시스템에서의 트랙점프제어장치를 제공한다.The present invention compares the phase of the output waveform according to the rotational speed of the sled motor and the moving speed of the optical pickup during the high speed track jump of the optical pickup by the sled motor to compensate for the phase difference, thereby tracking the tracking operation of the tracking coil. Provided is a track jump control apparatus in an optical disc reproducing system for controlling the objective lens to vibrate in the tracking direction.

그에 따라 본 발명은 슬레드모터(10)의 구동을 통해 대물렌즈(11)가 갖추어진 광픽업(12)이 광디스크(CD)의 기록트랙상으로 고속 트랙점프함에 의해, RF증폭부(18)에서 증폭된 정보신호를 입력받은 디지털신호처리부(20)에서 트랙킹에러신호를 발생하는 광디스크재생시스템에 있어서; 상기 슬레드 모터(10)의 고속 트랙점프에 따라 가변되는 회전속도를 엔코딩한 속도펄스 신호를 발생하는 로터리엔코더(14)와, 상기 발생되는 속도펄스신호의 신호 레벨을 슬라이스 하는 제1레벨슬라이스(16), 상기 트랙킹에러신호의 신호레벨을 슬라이스 하는 제2레벨슬라이스(22), 상기 트랙킹에러신호와 고속펄스 신호의 주파수 위상을 비교하는 위상비교부(24), 상기 위상 비교부(24)의 위상비교에 따른 출력신호를 저역통과 필터링하는 LPF(26), 상기 저역통과 필터링된 출력신호의 주파수 위상을 보상하는 위상보상기(28), 상기 위상이 보상된 출력신호를 전력증폭하는 전력 증폭부(30) 및, 상기 전력 증포된 출력신호를 트랙킹제어신호로서 인가받아 상기 광픽업(12)에 설치된 대물렌즈(11)의 트랙킹방향으로의 진동을 역지(逆止)시키기 위한 트랙킹코일(32)을 구비하여 구성된 것을 특징으로 한다.Accordingly, in the present invention, the optical pickup 12 equipped with the objective lens 11 through the driving of the sled motor 10 performs a high-speed track jump on the recording track of the optical disc CD. An optical disc reproducing system for generating a tracking error signal in a digital signal processing unit (20) receiving an amplified information signal; A rotary encoder 14 generating a speed pulse signal encoding a variable rotation speed according to the high speed track jump of the sled motor 10, and a first level slice that slices a signal level of the generated speed pulse signal ( 16), the second level slice 22 to slice the signal level of the tracking error signal, the phase comparison unit 24 for comparing the frequency phase of the tracking error signal and the high-speed pulse signal, of the phase comparison unit 24 LPF 26 for low-pass filtering the output signal according to the phase comparison, a phase compensator 28 for compensating the frequency phase of the low-pass filtered output signal, a power amplifier for power amplifying the phase-compensated output signal ( 30) and a tracking coil 32 for applying the power-amplified output signal as a tracking control signal to check the vibration in the tracking direction of the objective lens 11 installed in the optical pickup 12. Characterized in that provided.

Description

Track Jump Control System in Optical Disc Playback System

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명에 따른 광디스크재생시스템에서의 트랙점프제어장치를 나타낸 블럭구성도이다.2 is a block diagram showing a track jump control apparatus in the optical disc reproducing system according to the present invention.

Claims

The information signal amplified by the RF amplifier 18 by the optical pickup 12 equipped with the objective lens 11 by driving the sled motor 10 at high speed track jumping onto the recording track of the optical disc CD. In the optical disc reproducing system for generating a tracking error signal from the digital signal processing unit 20, a rotary encoder for generating a speed pulse signal encoding a rotation speed variable according to a high speed track jump of the sled motor 10 is input. 14, a first level slice 16 for slicing the signal level of the generated velocity pulse signal, a second level slice 22 for slicing the signal level of the tracking error signal, the tracking error signal and a high speed pulse A phase comparator 24 for comparing the frequency phase of the signal, an LPF 26 for low pass filtering the output signal according to the phase comparison of the phase comparator 24, and compensating the frequency phase of the low pass filtered output signal Is a phase compensator 28, a power amplifier 30 for amplifying the phase-compensated output signal, and an objective lens 11 installed in the optical pickup 12 by receiving the power-amplified output signal as a tracking control signal. And a tracking coil (32) for counteracting vibration in the tracking direction of the optical disc reproducing system.

※ Note: The disclosure is based on the initial application.