KR970007878A - Method and device for automatic adjustment of focus offset in optical disk system - Google Patents

Method and device for automatic adjustment of focus offset in optical disk system Download PDF

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Publication number
KR970007878A
KR970007878A KR1019950023477A KR19950023477A KR970007878A KR 970007878 A KR970007878 A KR 970007878A KR 1019950023477 A KR1019950023477 A KR 1019950023477A KR 19950023477 A KR19950023477 A KR 19950023477A KR 970007878 A KR970007878 A KR 970007878A
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KR
South Korea
Prior art keywords
value
envelope
signal
focus
focus offset
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KR1019950023477A
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Korean (ko)
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KR0162379B1 (en
Inventor
박종엽
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구자홍
Lg 전자 주식회사
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Priority to KR1019950023477A priority Critical patent/KR0162379B1/en
Publication of KR970007878A publication Critical patent/KR970007878A/en
Application granted granted Critical
Publication of KR0162379B1 publication Critical patent/KR0162379B1/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/094—Methods and circuits for servo offset compensation

Abstract

본 발명은 광 디스크 시스템에 관한 것으로, 특히 고밀도 광 디스크에서 포커스 오프셋을 인접 트랙의 영향이 최소가 되도록 자동으로 조정하는 광 디스크 시스템의 포커스 오프셋 자동조정장법 및 장치에 관한 것으로, 일반 광 디스크에서 트랙피치가 1.6㎛이므로 인접하는 트랙에 대한 영향은 어느정도 극복할 수 있지만, 일반적으로 고밀도 광 디스크에서는 트랙피치가 일반 광 디스크에 비해 그 크기가 반 이하로 줄어들기 때문에 알에프신호레벨이 가장 큰 곳에 포커스 오프셋을 조정하였을 경우에 알에프신호의 레벨은 크게되지만 레이저빔의 포커스가 어긋나 있다면 인접트랙에 영향을 받을 수 있어 재생된 알에프신호에 지터(Jitter)성분이 많이 존재하게 되어 신호의 에러율이 증가하게 되는 문제점이 있었으나, 본 발명에서는 알에프신호의 인벨러프 진폭레벨을 검출하여 그 값이 최대가 되는 점의 값을 최적의 포커스 오프셋값으로 선정함으로써 알에프신호 레벨이 최대가 되면서 아울러 인접 트랙의 영향이 최소가 되도록 자동으로 포커스 오프셋을 조정하여 최상의 알에프신호를 재생할 수 있는 조건을 만드는 효과가 있게 된다.BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an optical disc system, and more particularly, to an optical disc system that automatically adjusts a focus offset so that the influence of adjacent tracks is minimized in a high density optical disc. Since the pitch is 1.6 µm, the effect on the adjacent tracks can be overcome to some extent, but in general, in a high density optical disc, the track pitch is reduced by half or less compared to the general optical disc, so the focus offset at the largest RF signal level is increased. In this case, the level of the RF signal is increased but the focus of the laser beam is shifted, which may be affected by the adjacent track. Therefore, there are many jitter components in the reproduced RF signal, which increases the error rate of the signal. Although, in the present invention, the envelope of the RF signal By detecting the peak amplitude level and selecting the point where the value is maximum as the optimal focus offset value, the best offset signal is automatically adjusted by adjusting the focus offset so that the RF signal level is maximized and the influence of adjacent tracks is minimized. This has the effect of creating a condition to play back.

Description

광 디스크 시스템의 포커스 오프셋 자동조정방법 및 장치Method and device for automatic adjustment of focus offset in optical disk system

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

제5도는 본 발명 광 디스크 시스템의 포커스 오프셋 자동조정장치의 블럭도, 제6도는 본 발명 광 디스크 시스템의 포커스 오프셋 자동조정방법을 나타낸 도.5 is a block diagram of a focus offset automatic adjustment device of the optical disk system of the present invention, and FIG. 6 is a diagram showing a focus offset automatic adjustment method of the optical disk system of the present invention.

Claims (2)

트래킹 서보를 오프시키고 알에프신호의 인벨러프 진폭레벨값을 저장하며 그에 따른 포커스 오프셋값을 셋팅하는 제1과정과, 상기 제1과정에서 기 저장된 인벨러프 진폭레벨값을 기준으로 현재의 인벨러프 진폭레벨값을 비교하여 그 값이 감소되었다면 그에따른 포커스 오프셋값을 반대방향으로 증가시키는 제2과정과, 상기 제2과정에 의하여 비교된 값이 증가되었다면 현재의 인벨러프 진폭레벨이 증가된 후 감소되었는가를 판단하는 제3과정과, 제3과정에 의해 현재의 인벨러프 진폭레벨이 증가된 후 감소되지 않았다면 포커스 오프셋값을 동일방향으로 증가시키고, 현재의 인벨러프 진폭레벨이 증가된 후 감소되었다면 감소직전의 값으로 포커스 오프셋값을 선정하여 셋팅하는 제4과정으로 이루어진 것을 특징으로 하는 광 디스크 시스템의 포커스 오프셋 자동조정방법.A first step of turning off the tracking servo, storing the envelope amplitude level value of the RF signal, and setting a focus offset value accordingly; and a current envelope amplitude level based on the envelope amplitude level value previously stored in the first step. Comparing the values, if the value is decreased, the second process of increasing the corresponding focus offset value in the opposite direction; and if the value compared by the second process is increased, whether the current envelope amplitude level is increased and then decreased. If the third process of judging and the current envelope amplitude level are not decreased after being increased by the third process, the focus offset value is increased in the same direction, and if the current envelope amplitude level is decreased after being increased, A fourth process of selecting and setting a focus offset value as a value Offset automatic adjustment method. 픽업부에서 출력되는 알에프신호의 인벨러프를 검출하는 인벨러프 검출부와, 상기 인벨러프 검출부에 의해 검출된 인벨러프의 진폭을 검출하는 인벨러프 진폭검출부와, 상기 인벨러프 진폭검출부에서 검출된 인벨러프의 진폭값을 입력받아 그 값이 최대가 되는점을 찾아 오프셋값을 설정하는 컨트롤러와, 포커스에러신호를 입력받아 상기 컨트롤러에서 설정된 오프셋값에 의해 이를 보상하여 포커스 액츄에이터 구동부를 제어하는 포커스 서보부로 구성하여 된 것을 특징으로 하는 광 디스크 시스템의 포커스 오프셋 자동조정장치.An envelope detection section for detecting envelope of the RF signal output from the pickup section, an envelope amplitude detection section for detecting amplitude of the envelope detected by the envelope detection section, and an envelope detected by the envelope amplitude detection section. It consists of a controller that receives the amplitude value and finds the point where the value is maximum, and sets the offset value, and a focus servo unit that receives the focus error signal and compensates for it by the offset value set in the controller to control the focus actuator driver. Focus offset automatic adjustment device of the optical disk system, characterized in that the. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950023477A 1995-07-31 1995-07-31 Method and apparatus of automatic focus offset control for optical disk system KR0162379B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950023477A KR0162379B1 (en) 1995-07-31 1995-07-31 Method and apparatus of automatic focus offset control for optical disk system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950023477A KR0162379B1 (en) 1995-07-31 1995-07-31 Method and apparatus of automatic focus offset control for optical disk system

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KR970007878A true KR970007878A (en) 1997-02-21
KR0162379B1 KR0162379B1 (en) 1998-12-15

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100722588B1 (en) * 2000-10-05 2007-05-28 엘지전자 주식회사 Method for controlling a focus offset in optical disc driver
KR20020042201A (en) * 2000-11-30 2002-06-05 구자홍 Method for generating control signal of optical record/player
KR100774618B1 (en) * 2006-04-05 2007-11-08 엘지전자 주식회사 Method for controlling focus position in optical disc driver

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