SG85690G - Apparatus for recording and/or reading information in/from a track of a reflecting record carrier,which apparatus comprises a focusing control system with reduced spot-offset sensitivity - Google Patents
Apparatus for recording and/or reading information in/from a track of a reflecting record carrier,which apparatus comprises a focusing control system with reduced spot-offset sensitivityInfo
- Publication number
- SG85690G SG85690G SG856/90A SG85690A SG85690G SG 85690 G SG85690 G SG 85690G SG 856/90 A SG856/90 A SG 856/90A SG 85690 A SG85690 A SG 85690A SG 85690 G SG85690 G SG 85690G
- Authority
- SG
- Singapore
- Prior art keywords
- record carrier
- control signal
- track
- recording
- reading information
- Prior art date
Links
Classifications
-
- 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
-
- 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
-
- 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
- G11B7/0909—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 by astigmatic methods
Landscapes
- Optical Recording Or Reproduction (AREA)
- Holo Graphy (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8400674A NL8400674A (nl) | 1984-03-02 | 1984-03-02 | Inrichting voor het inschrijven en/of uitlezen van informatie in een spoor van een reflekterende registratiedrager, met een fokusregeling met verminderde spot offsetgevoeligheid. |
Publications (1)
Publication Number | Publication Date |
---|---|
SG85690G true SG85690G (en) | 1991-01-04 |
Family
ID=19843587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SG856/90A SG85690G (en) | 1984-03-02 | 1990-10-24 | Apparatus for recording and/or reading information in/from a track of a reflecting record carrier,which apparatus comprises a focusing control system with reduced spot-offset sensitivity |
Country Status (11)
Country | Link |
---|---|
US (1) | US4661944A (ja) |
EP (1) | EP0156418B1 (ja) |
JP (1) | JPS60205837A (ja) |
KR (1) | KR910007908B1 (ja) |
AT (1) | ATE43451T1 (ja) |
AU (1) | AU568426B2 (ja) |
CA (1) | CA1232966A (ja) |
DE (1) | DE3570545D1 (ja) |
HK (1) | HK86291A (ja) |
NL (1) | NL8400674A (ja) |
SG (1) | SG85690G (ja) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4823330A (en) * | 1985-02-04 | 1989-04-18 | International Business Machines Corporation | Focus servo loop off-set compensation |
US4899327A (en) * | 1985-02-04 | 1990-02-06 | International Business Machines Corporation | Focus servo loop correction |
US5004901A (en) * | 1987-06-04 | 1991-04-02 | Mitsubishi Denki Kabushiki Kaisha | Current mirror amplifier for use in an optical data medium driving apparatus and servo-circuit |
USRE34769E (en) * | 1986-01-16 | 1994-11-01 | Mitsubishi Denki Kabushiki Kaisha | Current mirror amplifier for use in an optical data medium driving apparatus and servo-circuit |
EP0241942B1 (en) * | 1986-04-18 | 1992-03-04 | Mitsubishi Denki Kabushiki Kaisha | Optical type head device |
JPS6310326A (ja) * | 1986-07-01 | 1988-01-16 | Sanyo Electric Co Ltd | 光ピツクアツプ装置 |
US4879706A (en) * | 1987-07-29 | 1989-11-07 | Laser Magnetic Storage International Company | Method and apparatus for focus and tracking in an optical disk system |
JPH01137433A (ja) * | 1987-11-13 | 1989-05-30 | Internatl Business Mach Corp <Ibm> | 範囲指示方法 |
US5305294A (en) * | 1988-04-04 | 1994-04-19 | Mitsubishi Denki Kabushiki Kaisha | Magneto-optical recording/reproducing system having an electromagnetic actuator |
EP0336687B1 (en) * | 1988-04-06 | 1995-02-15 | Mitsubishi Denki Kabushiki Kaisha | Recording and reproducing optical disk device |
NL9000282A (nl) * | 1990-02-06 | 1991-09-02 | Philips Nv | Optische aftastinrichting met meerdere aftastvlekken. |
US5241523A (en) * | 1991-12-05 | 1993-08-31 | Eastman Kodak Company | Polarization-based auto-focus apparatus |
DE4226777A1 (de) * | 1992-08-13 | 1994-02-17 | Thomson Brandt Gmbh | Rauschanteilverringerung im Datensignal und optische Abtastvorrichtung |
ES2112224T1 (es) * | 1995-12-06 | 1998-04-01 | Discovision Ass | Aparato y metodo para control de foco. |
US5956304A (en) * | 1997-08-15 | 1999-09-21 | Cirrus Logic, Inc. | Differential phase error detector using dual arm correlation for servo tracking in an optical disk storage device |
KR101058070B1 (ko) * | 2003-05-21 | 2011-08-22 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 광학 디스크 드라이브의 래디얼 트랙킹 방법 |
EP1756814A1 (en) * | 2004-06-01 | 2007-02-28 | Koninklijke Philips Electronics N.V. | Radial to focus cross talk cancellation in optical storage systems. |
US20070223322A1 (en) * | 2004-06-29 | 2007-09-27 | Koninklijke Philips Electronics, N.V. | Method and System for Generating a Spherical Aberration Signal Error |
US8213286B2 (en) * | 2007-07-30 | 2012-07-03 | Sanyo Electric Co., Ltd. | Photodetector and optical pickup apparatus including the same |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7402169A (nl) * | 1974-02-15 | 1975-08-19 | Philips Nv | Inrichting voor het uitlezen van een registra- tiedrager waarop informatie is aangebracht in een optisch uitleesbare struktuur. |
GB1532345A (en) * | 1976-06-25 | 1978-11-15 | Hitachi Ltd | Information play-back apparatus |
NL7708200A (nl) * | 1976-07-28 | 1978-01-31 | Hitachi Ltd | Automatische scherpstellingsinrichting. |
NL7703076A (nl) * | 1977-03-22 | 1978-09-26 | Philips Nv | Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager. |
NL7703077A (nl) * | 1977-03-22 | 1978-09-26 | Philips Nv | Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager. |
JPS5821334B2 (ja) * | 1978-12-25 | 1983-04-28 | 株式会社東芝 | 自動焦点調節装置 |
JPS5774837A (en) * | 1980-10-25 | 1982-05-11 | Olympus Optical Co Ltd | Signal detection system of optical information reproducing device |
JPS5877036A (ja) * | 1981-10-30 | 1983-05-10 | Olympus Optical Co Ltd | ピット中心検出方法 |
JPS58125241A (ja) * | 1982-01-20 | 1983-07-26 | Matsushita Electric Ind Co Ltd | 光学記録再生装置 |
NL8200208A (nl) * | 1982-01-21 | 1983-08-16 | Philips Nv | Inrichting voor het uitlezen van een schijfvormige registratiedrager. |
-
1984
- 1984-03-02 NL NL8400674A patent/NL8400674A/nl not_active Application Discontinuation
- 1984-06-11 US US06/619,430 patent/US4661944A/en not_active Expired - Lifetime
-
1985
- 1985-02-28 DE DE8585200293T patent/DE3570545D1/de not_active Expired
- 1985-02-28 CA CA000475383A patent/CA1232966A/en not_active Expired
- 1985-02-28 KR KR1019850001263A patent/KR910007908B1/ko not_active IP Right Cessation
- 1985-02-28 AT AT85200293T patent/ATE43451T1/de not_active IP Right Cessation
- 1985-02-28 JP JP60040237A patent/JPS60205837A/ja active Granted
- 1985-02-28 EP EP85200293A patent/EP0156418B1/en not_active Expired
- 1985-03-01 AU AU39405/85A patent/AU568426B2/en not_active Ceased
-
1990
- 1990-10-24 SG SG856/90A patent/SG85690G/en unknown
-
1991
- 1991-10-31 HK HK862/91A patent/HK86291A/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
AU568426B2 (en) | 1987-12-24 |
EP0156418B1 (en) | 1989-05-24 |
ATE43451T1 (de) | 1989-06-15 |
EP0156418A1 (en) | 1985-10-02 |
AU3940585A (en) | 1985-09-05 |
KR850007140A (ko) | 1985-10-30 |
DE3570545D1 (en) | 1989-06-29 |
HK86291A (en) | 1991-11-08 |
JPH0514968B2 (ja) | 1993-02-26 |
CA1232966A (en) | 1988-02-16 |
JPS60205837A (ja) | 1985-10-17 |
KR910007908B1 (ko) | 1991-10-04 |
US4661944A (en) | 1987-04-28 |
NL8400674A (nl) | 1985-10-01 |
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