HK90195A - Apparatus and method for detecting focus errors - Google Patents
Apparatus and method for detecting focus errorsInfo
- Publication number
- HK90195A HK90195A HK90195A HK90195A HK90195A HK 90195 A HK90195 A HK 90195A HK 90195 A HK90195 A HK 90195A HK 90195 A HK90195 A HK 90195A HK 90195 A HK90195 A HK 90195A
- Authority
- HK
- Hong Kong
- Prior art keywords
- focus errors
- detecting focus
- detecting
- errors
- focus
- 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
- 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
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
- G11B7/133—Shape of individual detector elements
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1359—Single prisms
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US35756689A | 1989-05-26 | 1989-05-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| HK90195A true HK90195A (en) | 1995-06-16 |
Family
ID=23406136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HK90195A HK90195A (en) | 1989-05-26 | 1995-06-08 | Apparatus and method for detecting focus errors |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5084783A (xx) |
| EP (1) | EP0399977B1 (xx) |
| JP (1) | JPH0317835A (xx) |
| KR (1) | KR930005786B1 (xx) |
| CN (1) | CN1027402C (xx) |
| AU (1) | AU623778B2 (xx) |
| CA (1) | CA2012401C (xx) |
| DE (1) | DE69016831T2 (xx) |
| HK (1) | HK90195A (xx) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5237457A (en) * | 1990-10-04 | 1993-08-17 | Asahi Kogaku Kogyo Kabushiki Kaisha | Apparatus for adjusting an optical axis including a laser beam source and a beam shaping prism |
| JP3157873B2 (ja) * | 1991-11-15 | 2001-04-16 | パイオニア株式会社 | 光ピックアップ装置における焦点制御装置 |
| US5448407A (en) * | 1993-09-03 | 1995-09-05 | Industrial Technology Research Institute | Equivalent wollaston prism for an optical pick-up head and an optical pick-up head using of the same |
| JPH07326065A (ja) * | 1994-05-27 | 1995-12-12 | Hitachi Ltd | 光情報処理装置 |
| US6542304B2 (en) | 1999-05-17 | 2003-04-01 | Toolz, Ltd. | Laser beam device with apertured reflective element |
| JP4843844B2 (ja) * | 1999-12-27 | 2011-12-21 | ソニー株式会社 | 光ヘッド、受発光素子、及び光記録媒体記録再生装置 |
| KR100750093B1 (ko) | 2000-10-12 | 2007-08-21 | 삼성전자주식회사 | 광픽업용 디포커스 에러신호 검출장치 및 방법 및 이를채용한 시크 방향 검출장치 및 방법 |
| FR2847187B1 (fr) * | 2002-11-18 | 2005-09-23 | Le Controle Ind | Systeme et procede pour deplacer un point de focalisation d'un rayonnement laser de puissance |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE24972E (en) * | 1961-04-25 | E luboshez | ||
| NL7907216A (nl) * | 1979-09-28 | 1981-03-31 | Philips Nv | Optisch fokusfout-detektiestelsel. |
| NL8104588A (nl) * | 1981-10-08 | 1983-05-02 | Philips Nv | Bundelscheidingsprisma, werkwijze voor het vervaardigen van dit prisma en van dit prisma voorziene optische lees- en/of schrijfeenheid. |
| EP0099123B1 (en) * | 1982-07-15 | 1990-11-28 | Matsushita Electric Industrial Co., Ltd. | Optical recording and reproducing head |
| FR2546310B1 (fr) * | 1983-05-20 | 1986-04-25 | Thomson Csf | Monture reglable pour miroir pivotant et tete optique d'enregistrement-lecture utilisant une telle monture |
| JPS60131648A (ja) * | 1983-12-19 | 1985-07-13 | Toshiba Corp | 光学ヘツド |
| JPH069090B2 (ja) * | 1984-06-12 | 1994-02-02 | 株式会社東芝 | 光学ヘツド |
| JPS6118918A (ja) * | 1984-07-05 | 1986-01-27 | Ricoh Co Ltd | ビ−ム整形光学系 |
| JPS61177645A (ja) * | 1985-01-31 | 1986-08-09 | Fujitsu Ltd | 焦点誤差制御装置 |
| JP2596545B2 (ja) * | 1987-01-07 | 1997-04-02 | パイオニア株式会社 | 焦点誤差検出装置及びこれに用いられる光検出器の受光領域幅の選定方法 |
| JPH01105338A (ja) * | 1987-07-14 | 1989-04-21 | Mitsubishi Electric Corp | 光記録再生装置 |
| US4793696A (en) * | 1987-11-13 | 1988-12-27 | Hoechst Celanese Corporation | Method and apparatus for rapid focus control in an optical data storage device |
| JPH01260636A (ja) * | 1988-04-12 | 1989-10-17 | Konica Corp | 焦点検出方法 |
-
1990
- 1990-03-16 CA CA002012401A patent/CA2012401C/en not_active Expired - Fee Related
- 1990-04-20 US US07/511,664 patent/US5084783A/en not_active Expired - Fee Related
- 1990-05-11 KR KR1019900006690A patent/KR930005786B1/ko not_active IP Right Cessation
- 1990-05-14 CN CN90102759A patent/CN1027402C/zh not_active Expired - Fee Related
- 1990-05-21 DE DE69016831T patent/DE69016831T2/de not_active Expired - Fee Related
- 1990-05-21 EP EP90850192A patent/EP0399977B1/en not_active Expired - Lifetime
- 1990-05-21 AU AU55784/90A patent/AU623778B2/en not_active Ceased
- 1990-05-25 JP JP2134232A patent/JPH0317835A/ja active Pending
-
1995
- 1995-06-08 HK HK90195A patent/HK90195A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA2012401C (en) | 1994-05-10 |
| DE69016831D1 (de) | 1995-03-23 |
| CA2012401A1 (en) | 1990-11-26 |
| EP0399977A3 (en) | 1991-01-23 |
| CN1027402C (zh) | 1995-01-11 |
| CN1047584A (zh) | 1990-12-05 |
| KR930005786B1 (ko) | 1993-06-24 |
| AU5578490A (en) | 1990-11-29 |
| EP0399977A2 (en) | 1990-11-28 |
| EP0399977B1 (en) | 1995-02-15 |
| AU623778B2 (en) | 1992-05-21 |
| JPH0317835A (ja) | 1991-01-25 |
| KR900018940A (ko) | 1990-12-22 |
| DE69016831T2 (de) | 1995-08-10 |
| US5084783A (en) | 1992-01-28 |
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