DE68913681D1 - Optischer Kopf zur optimalen Detektierung eines Fokusfehlers. - Google Patents
Optischer Kopf zur optimalen Detektierung eines Fokusfehlers.Info
- Publication number
- DE68913681D1 DE68913681D1 DE89123469T DE68913681T DE68913681D1 DE 68913681 D1 DE68913681 D1 DE 68913681D1 DE 89123469 T DE89123469 T DE 89123469T DE 68913681 T DE68913681 T DE 68913681T DE 68913681 D1 DE68913681 D1 DE 68913681D1
- Authority
- DE
- Germany
- Prior art keywords
- optical head
- focus error
- optimal detection
- optimal
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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
- G11B7/12—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
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors 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
- G11B7/0908—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
- G11B7/0916—Foucault or knife-edge methods
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63322498A JPH0679380B2 (ja) | 1988-12-20 | 1988-12-20 | 焦点誤差検出装置 |
JP63322496A JPH0626024B2 (ja) | 1988-12-20 | 1988-12-20 | 光ヘッド装置 |
JP63322497A JPH0685224B2 (ja) | 1988-12-20 | 1988-12-20 | 焦点誤差検出装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE68913681D1 true DE68913681D1 (de) | 1994-04-14 |
DE68913681T2 DE68913681T2 (de) | 1994-06-16 |
Family
ID=27339919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE68913681T Expired - Fee Related DE68913681T2 (de) | 1988-12-20 | 1989-12-19 | Optischer Kopf zur optimalen Detektierung eines Fokusfehlers. |
Country Status (3)
Country | Link |
---|---|
US (1) | US5151892A (de) |
EP (1) | EP0374841B1 (de) |
DE (1) | DE68913681T2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69327369T2 (de) * | 1992-02-07 | 2000-06-21 | Sony Corp | Optisches abtastgerät für eine magneto-optische speicherung |
US6757224B2 (en) | 2000-09-29 | 2004-06-29 | Matsushita Electric Industrial Co., Ltd. | Integrated optical component and optical pick-up device |
WO2003079338A2 (en) * | 2002-03-20 | 2003-09-25 | Matsushita Electric Industrial Co., Ltd. | Control method for focus and tracking in pickup apparatus |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4504938A (en) * | 1981-04-07 | 1985-03-12 | Victor Company Of Japan, Limited | Device for feedback controlling focus of an optical system in an information recording/reproducing apparatus |
US4733065A (en) * | 1984-06-27 | 1988-03-22 | Canon Kabushiki Kaisha | Optical head device with diffraction grating for separating a light beam incident on an optical recording medium from a light beam reflected therefrom |
US4750162A (en) * | 1985-07-16 | 1988-06-07 | Victor Company Of Japan, Ltd. | Optical tracking system utilizing three photo-detectors |
DE3679648D1 (de) * | 1985-12-10 | 1991-07-11 | Nec Corp | Optischer kopf mit einem beugungsgitter zum richten von zwei oder mehreren gebeugten lichtstrahlen auf optische detektoren. |
CA1277767C (en) * | 1986-03-19 | 1990-12-11 | Kenji Torazawa | Optical recording apparatus |
DE3786497T2 (de) * | 1986-07-18 | 1994-02-17 | Nippon Electric Co | Doppelbrechendes Beugungsgitter und optischer Kopf, in welchem ein linearpolarisierter Strahl auf dieses Gitter gelenkt wird. |
JPH0760527B2 (ja) * | 1986-09-17 | 1995-06-28 | パイオニア株式会社 | 光学式ピックアップ装置 |
DE3778670D1 (de) * | 1986-12-25 | 1992-06-04 | Nec Corp | Optischer kopf. |
US4907847A (en) * | 1987-09-28 | 1990-03-13 | Nec Home Electronics Ltd. | Optical pickup and hologram therefor |
JPH0827961B2 (ja) * | 1987-11-11 | 1996-03-21 | 日本電気ホームエレクトロニクス株式会社 | ホログラム式光ヘッドの光検出器 |
NL8800133A (nl) * | 1988-01-21 | 1989-08-16 | Philips Nv | Inrichting voor het met optische straling aftasten van een informatievlak. |
US4983017A (en) * | 1988-08-02 | 1991-01-08 | Sharp Kabushiki Kaisha | Optical head device for reading information stored in a recording medium |
-
1989
- 1989-12-19 EP EP89123469A patent/EP0374841B1/de not_active Expired - Lifetime
- 1989-12-19 DE DE68913681T patent/DE68913681T2/de not_active Expired - Fee Related
- 1989-12-20 US US07/453,894 patent/US5151892A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US5151892A (en) | 1992-09-29 |
EP0374841A1 (de) | 1990-06-27 |
EP0374841B1 (de) | 1994-03-09 |
DE68913681T2 (de) | 1994-06-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |