KR970071540A - The focus servo control circuit of the disc recording and reproducing apparatus - Google Patents

The focus servo control circuit of the disc recording and reproducing apparatus Download PDF

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Publication number
KR970071540A
KR970071540A KR1019960012001A KR19960012001A KR970071540A KR 970071540 A KR970071540 A KR 970071540A KR 1019960012001 A KR1019960012001 A KR 1019960012001A KR 19960012001 A KR19960012001 A KR 19960012001A KR 970071540 A KR970071540 A KR 970071540A
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KR
South Korea
Prior art keywords
output
signal
multiplier
offset
focus error
Prior art date
Application number
KR1019960012001A
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Korean (ko)
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KR100214597B1 (en
Inventor
김대영
Original Assignee
구자홍
Lg 전자 주식회사
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Priority to KR1019960012001A priority Critical patent/KR100214597B1/en
Publication of KR970071540A publication Critical patent/KR970071540A/en
Application granted granted Critical
Publication of KR100214597B1 publication Critical patent/KR100214597B1/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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • 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
    • G11B7/0908—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 for focusing only
    • 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

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  • Optical Recording Or Reproduction (AREA)

Abstract

본 발명은 디스크 기록재생기의 포커스 서보 제어 회로에 관한 것으로, 종래에는 디스크의 종류에 따라 오프셋이 변화되거나 디스크의 반사율에 의해 검출 이득이 크게 변화함으로 디스크가 변경될 때마다 이득을 조정하여야 하는 불편함이 있다. 이러한 종래의 문제점을 개선하기 위하여 본 발명은 재생 고주파에서 포커서 에러 신호의 변화에 따른 크기 변화를 검출하여 포커스 제어 신호의 DC 오프셋을 검출하고 이 DC 오프셋으로 이득을 제어함으로써 디스크 종류에 따라 적응적으로 이득을 조정할 수 있도록 창안한 것으로, 본 발명은 포커스 에러 신호와 고주파 재생 신호를 비교함에 의해 오프셋을 검출하여 적응적으로 이득을 조정함으로써 포커스 에러를 보상하여 안정된 재생 동작을 수행하도록 한다.The present invention relates to a focus servo control circuit of a disk recording and reproducing apparatus, and conventionally, it is inconvenient to adjust a gain every time a disk is changed because an offset is changed according to the disk type or a detection gain is greatly changed by the reflectance of the disk . In order to solve such a conventional problem, the present invention detects a DC offset of a focus control signal by detecting a magnitude change according to a change of a focus error signal in a reproduction high frequency, and controls a gain by the DC offset to adaptively In the present invention, the focus error signal and the high frequency reproduction signal are compared with each other to detect an offset, and the gain is adjusted adaptively to compensate for the focus error, thereby performing a stable reproduction operation.

Description

디스크 기록재생기의 포커스 서보 제어 회로The focus servo control circuit of the disc recording and reproducing apparatus

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제2도는 본 발명의 포커스 서보 제어 회로의 블럭도.FIG. 2 is a block diagram of a focus servo control circuit according to the present invention; FIG.

Claims (3)

디스크 재생 장치에서 포커스 에러 신호의 변화에 따른 크기로부터 오프셋 신호를 검출하고 상기 오프셋 신호를 조정하여 출력 신호의 변화가 적게 되도록 포커스 제어 이득을 조절하는 것을 특징으로 하는 디스크 기록재생기의 포커스 서보 제어 회로.Wherein the focus servo control circuit adjusts the focus control gain such that an offset signal is detected from a magnitude in accordance with a change in a focus error signal in the disk reproducing apparatus and the offset signal is adjusted to reduce a change in an output signal. 디스크의 기록 정보를 검출하는 광픽업 수단과, 이 광픽업 수단의 재생 신호로부터 포커스 에러를 검출하는 포커스 에러 검출 수단과, 상기 광픽업 수단의 재생 고주파 신호를 검파하는 검파 수단과, 이 검파 수단의 출력 신호에서 포커스 에러 신호의 변화에 따른 크기 변화를 검출하고 상기 포커스 에러 검출 수단의 출력신호와 비교하여 DC 오프셋 성분을 검출하고 이 오프셋 성분에 의하여 오프셋을 조정하는 제어 수단과, 상기 검파 수단의 출력 신호의 변화가 적어지도록 포커스 제어 이득을 조절하는 포커스 구동 수단으로 구성한 것을 특징으로 하는 디스크 기록재생기의 포커스 서보 제어 회로.A focus error detection means for detecting a focus error from a reproduction signal of the optical pickup means; a detection means for detecting a reproduction high frequency signal of the optical pickup means; Control means for detecting a magnitude change due to a change in the focus error signal in the output signal and comparing the magnitude of the output signal with the output signal of the focus error detection means to detect a DC offset component and adjusting the offset by the offset component; And a focus driving means for adjusting a focus control gain so that a change in a signal is reduced. 제2항에 있어서, 제어 수단은 검파 수단의 출력과 포커스 에러 검출 수단의 출력을 곱셈하는 제1곱셈기와, 상기 포커스 에러 검출 수단의 출력을 체배하여 배수 주파수를 발생시키는 체배기와, 이체배기의 출력과 상기 제1곱셈기의 출력을 곱셈하는 제2곱셈기와, 이 제2곱셈기의 출력을 적분하는 제1적분기와, 이 제1적분기의 출력을 상기 포커스 에러 검출수단의 출력에 곱하여 감도를 조정하는 제3곱셈기와, 상기 제1곱셈기의 출력을 적분하여 오프셋을 검출하는 제2적분기와, 이 제2적분기의 출력을 상기 제3곱셈기의 출력과 합산하여 오프셋을 조정하는 덧셈기로 구성한 것을 특징으로 하는 디스크 기록재생기의 포커스 서보 제어 회로.The focus error detection apparatus according to claim 2, wherein the control means comprises: a first multiplier for multiplying the output of the detection means and the output of the focus error detection means; a multiplier for multiplying an output of the focus error detection means to generate a drain frequency; A first multiplier for multiplying the output of the first multiplier by an output of the first multiplier, a first integrator for integrating the output of the second multiplier, and a second integrator for multiplying the output of the first integrator by the output of the focus error detecting means, A multiplier for multiplying the output of the first multiplier by a second integrator for detecting an offset by integrating the output of the first multiplier, and an adder for adjusting an offset by summing the output of the second integrator with the output of the third multiplier. Focus servo control circuit of the recording and reproducing apparatus. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960012001A 1996-04-19 1996-04-19 Focus servo control circuit of disk recording and reproducing device KR100214597B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960012001A KR100214597B1 (en) 1996-04-19 1996-04-19 Focus servo control circuit of disk recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960012001A KR100214597B1 (en) 1996-04-19 1996-04-19 Focus servo control circuit of disk recording and reproducing device

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Publication Number Publication Date
KR970071540A true KR970071540A (en) 1997-11-07
KR100214597B1 KR100214597B1 (en) 1999-08-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040062258A (en) * 2003-01-02 2004-07-07 삼성전자주식회사 A focus error control method, a speed control method thereof, and apparatuses therefor
KR100817045B1 (en) * 2002-03-06 2008-03-26 삼성전자주식회사 Apparatus and method for deleting noise

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100817045B1 (en) * 2002-03-06 2008-03-26 삼성전자주식회사 Apparatus and method for deleting noise
KR20040062258A (en) * 2003-01-02 2004-07-07 삼성전자주식회사 A focus error control method, a speed control method thereof, and apparatuses therefor

Also Published As

Publication number Publication date
KR100214597B1 (en) 1999-08-02

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