JPH0554179B2 - - Google Patents

Info

Publication number
JPH0554179B2
JPH0554179B2 JP58191280A JP19128083A JPH0554179B2 JP H0554179 B2 JPH0554179 B2 JP H0554179B2 JP 58191280 A JP58191280 A JP 58191280A JP 19128083 A JP19128083 A JP 19128083A JP H0554179 B2 JPH0554179 B2 JP H0554179B2
Authority
JP
Japan
Prior art keywords
reflected light
objective lens
recording medium
photodetector
spot
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
Application number
JP58191280A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6083229A (ja
Inventor
Kazuo Okada
Shinsuke Shikama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP58191280A priority Critical patent/JPS6083229A/ja
Priority to EP19840110194 priority patent/EP0137272B1/en
Priority to DE8484110194T priority patent/DE3484723D1/de
Publication of JPS6083229A publication Critical patent/JPS6083229A/ja
Publication of JPH0554179B2 publication Critical patent/JPH0554179B2/ja
Granted 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
    • G11B7/13—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
    • G11B7/0909—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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP58191280A 1983-09-05 1983-10-13 光デイスクヘツドの自動焦点調節装置 Granted JPS6083229A (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP58191280A JPS6083229A (ja) 1983-10-13 1983-10-13 光デイスクヘツドの自動焦点調節装置
EP19840110194 EP0137272B1 (en) 1983-09-05 1984-08-28 Automatic focusing device
DE8484110194T DE3484723D1 (de) 1983-09-05 1984-08-28 Automatisches fokussierungsverfahren.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58191280A JPS6083229A (ja) 1983-10-13 1983-10-13 光デイスクヘツドの自動焦点調節装置

Publications (2)

Publication Number Publication Date
JPS6083229A JPS6083229A (ja) 1985-05-11
JPH0554179B2 true JPH0554179B2 (en, 2012) 1993-08-11

Family

ID=16271927

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58191280A Granted JPS6083229A (ja) 1983-09-05 1983-10-13 光デイスクヘツドの自動焦点調節装置

Country Status (1)

Country Link
JP (1) JPS6083229A (en, 2012)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002157756A (ja) 2000-11-15 2002-05-31 Sharp Corp 焦点位置ずれ検出方法および光ピックアップ装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2271590B1 (en, 2012) * 1974-01-15 1978-12-01 Thomson Brandt
JPS5339123A (en) * 1976-09-22 1978-04-10 Canon Inc Automatic winder of cameras

Also Published As

Publication number Publication date
JPS6083229A (ja) 1985-05-11

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees