DE68913681T2 - Optischer Kopf zur optimalen Detektierung eines Fokusfehlers. - Google Patents

Optischer Kopf zur optimalen Detektierung eines Fokusfehlers.

Info

Publication number
DE68913681T2
DE68913681T2 DE68913681T DE68913681T DE68913681T2 DE 68913681 T2 DE68913681 T2 DE 68913681T2 DE 68913681 T DE68913681 T DE 68913681T DE 68913681 T DE68913681 T DE 68913681T DE 68913681 T2 DE68913681 T2 DE 68913681T2
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 - Lifetime
Application number
DE68913681T
Other languages
English (en)
Other versions
DE68913681D1 (de
Inventor
Yasuo C O Nec Corporati Kimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP63322496A external-priority patent/JPH0626024B2/ja
Priority claimed from JP63322497A external-priority patent/JPH0685224B2/ja
Priority claimed from JP63322498A external-priority patent/JPH0679380B2/ja
Application filed by NEC Corp filed Critical NEC Corp
Publication of DE68913681D1 publication Critical patent/DE68913681D1/de
Application granted granted Critical
Publication of DE68913681T2 publication Critical patent/DE68913681T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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)
DE68913681T 1988-12-20 1989-12-19 Optischer Kopf zur optimalen Detektierung eines Fokusfehlers. Expired - Lifetime DE68913681T2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
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
JP63322498A JPH0679380B2 (ja) 1988-12-20 1988-12-20 焦点誤差検出装置

Publications (2)

Publication Number Publication Date
DE68913681D1 DE68913681D1 (de) 1994-04-14
DE68913681T2 true DE68913681T2 (de) 1994-06-16

Family

ID=27339919

Family Applications (1)

Application Number Title Priority Date Filing Date
DE68913681T Expired - Lifetime 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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3658763B2 (ja) * 1992-02-07 2005-06-08 ソニー株式会社 光磁気記憶装置用光ピックアップ装置
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)

* Cited by examiner, † Cited by third party
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.
EP0238055B1 (de) * 1986-03-19 1993-09-15 Sanyo Electric Co., Ltd. Optisches Aufzeichnungsgerät
DE3786497T2 (de) * 1986-07-18 1994-02-17 Nec Corp 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
EP0273356B1 (de) * 1986-12-25 1992-04-29 Nec Corporation 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

Also Published As

Publication number Publication date
DE68913681D1 (de) 1994-04-14
EP0374841B1 (de) 1994-03-09
US5151892A (en) 1992-09-29
EP0374841A1 (de) 1990-06-27

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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