DE3583895D1 - Optischer kopf zur fokussierung eines lichtbuendels auf einer optischen platte. - Google Patents

Optischer kopf zur fokussierung eines lichtbuendels auf einer optischen platte.

Info

Publication number
DE3583895D1
DE3583895D1 DE8585106928T DE3583895T DE3583895D1 DE 3583895 D1 DE3583895 D1 DE 3583895D1 DE 8585106928 T DE8585106928 T DE 8585106928T DE 3583895 T DE3583895 T DE 3583895T DE 3583895 D1 DE3583895 D1 DE 3583895D1
Authority
DE
Germany
Prior art keywords
optical
bunch
focusing
light
optical head
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
DE8585106928T
Other languages
English (en)
Inventor
Hideo Patent Division Ando
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.)
Toshiba Corp
Original Assignee
Toshiba 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
Application filed by Toshiba Corp filed Critical Toshiba Corp
Application granted granted Critical
Publication of DE3583895D1 publication Critical patent/DE3583895D1/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
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical 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
    • G11B7/08—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)
  • Automatic Focus Adjustment (AREA)
DE8585106928T 1984-06-12 1985-06-04 Optischer kopf zur fokussierung eines lichtbuendels auf einer optischen platte. Expired - Lifetime DE3583895D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59120373A JPH069090B2 (ja) 1984-06-12 1984-06-12 光学ヘツド

Publications (1)

Publication Number Publication Date
DE3583895D1 true DE3583895D1 (de) 1991-10-02

Family

ID=14784596

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8585106928T Expired - Lifetime DE3583895D1 (de) 1984-06-12 1985-06-04 Optischer kopf zur fokussierung eines lichtbuendels auf einer optischen platte.

Country Status (4)

Country Link
US (1) US4716283A (de)
EP (1) EP0164687B1 (de)
JP (1) JPH069090B2 (de)
DE (1) DE3583895D1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2595210B2 (ja) * 1986-05-12 1997-04-02 松下電器産業株式会社 光ピックアップ装置
EP0224853B1 (de) * 1985-11-30 1992-02-05 Kabushiki Kaisha Toshiba Optischer Kopf
JPH0654551B2 (ja) * 1986-02-07 1994-07-20 インスティテュト プロブレム モデリロバニア ベ− エネルゲティケ アカデミイ ナウク ウクラインスコイ エスエスエ−ル 光学的情報担体，それにおける情報の消去方法，およびこの方法を実現する光学的格納装置
US4891799A (en) * 1987-03-13 1990-01-02 Fuji Electrochemical Co., Ltd. Optical head apparatus for writing and reading data on an optical disk having a lens with an inclined optical axis
US4954702A (en) * 1987-10-14 1990-09-04 Konica Corporation Process for detecting a focal point in an optical head
JP2570325B2 (ja) * 1987-10-30 1997-01-08 セイコーエプソン株式会社 光学ヘッド
JPH02265028A (ja) * 1989-04-06 1990-10-29 Mitsubishi Electric Corp 光記録再生装置
JPH03130940A (ja) * 1989-05-24 1991-06-04 Kyocera Corp 光スポット制御方法および制御装置
CA2012401C (en) * 1989-05-26 1994-05-10 Anthony G. Dewey Focus-error detection using prism-enhanced spot size monitoring
US5216562A (en) * 1990-09-25 1993-06-01 International Business Machines Corporation Multi-beam optical recording system and method
US5253245A (en) * 1992-01-21 1993-10-12 International Business Machines Corporation Optical data storage tracking system
US5682372A (en) * 1995-08-22 1997-10-28 Sony Corporation Method and apparatus for playing back multilayer disk
TW419653B (en) * 1999-03-16 2001-01-21 Ind Tech Res Inst Optical pick-up head with multiple light sources
JP2001034999A (ja) * 1999-05-14 2001-02-09 Fujitsu Ltd 光情報記憶装置および光学素子
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 (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325987A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Dispositif de lecture optique d'un enregistrement
FR2325953A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Senseur optique de focalisation et dispositif de focalisation comportant un tel senseur
JPS6012693B2 (ja) * 1979-01-22 1985-04-03 日本ビクター株式会社 光学的情報再生装置における自動焦点合せ装置
JPS567246A (en) * 1979-06-25 1981-01-24 Olympus Optical Co Ltd Method and unit for focus detection
JPS5746335A (en) * 1980-09-02 1982-03-16 Matsushita Electric Ind Co Ltd Optical parts of optical disk information reproducer
US4378491A (en) * 1981-01-26 1983-03-29 Lehman Thomas F Optical apparatus for sensing information from a phonograph record for controlling spacing and tracking of the pick-up relative to the record
JPS57133526A (en) * 1981-02-10 1982-08-18 Sharp Corp Processor of optical information
US4521680A (en) * 1981-07-20 1985-06-04 Tokyo Shibaura Denki Kabushiki Kaisha System for focusing a light beam on a light reflecting surface
FR2523350B1 (fr) * 1982-03-09 1987-05-22 Thomson Csf Tete optique dans un dispositif d'enregistrement-lecture d'un support d'information

Also Published As

Publication number Publication date
US4716283A (en) 1987-12-29
EP0164687A2 (de) 1985-12-18
EP0164687B1 (de) 1991-08-28
EP0164687A3 (en) 1988-02-03
JPH069090B2 (ja) 1994-02-02
JPS60263341A (ja) 1985-12-26

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8320 Willingness to grant licences declared (paragraph 23)
8339 Ceased/non-payment of the annual fee