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 PDFInfo
- 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
- Authority
- KR
- South Korea
- Prior art keywords
- output
- signal
- multiplier
- offset
- focus error
- Prior art date
Links
Classifications
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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
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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
- G11B7/0908—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
Landscapes
- 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
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)
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR970071540A true KR970071540A (en) | 1997-11-07 |
KR100214597B1 KR100214597B1 (en) | 1999-08-02 |
Family
ID=19456203
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019960012001A KR100214597B1 (en) | 1996-04-19 | 1996-04-19 | Focus servo control circuit of disk recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR100214597B1 (en) |
Cited By (2)
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 |
-
1996
- 1996-04-19 KR KR1019960012001A patent/KR100214597B1/en not_active IP Right Cessation
Cited By (2)
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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GRNT | Written decision to grant | ||
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Payment date: 20070418 Year of fee payment: 9 |
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