JPS6083229A - 光デイスクヘツドの自動焦点調節装置 - Google Patents

光デイスクヘツドの自動焦点調節装置

Info

Publication number
JPS6083229A
JPS6083229A JP58191280A JP19128083A JPS6083229A JP S6083229 A JPS6083229 A JP S6083229A JP 58191280 A JP58191280 A JP 58191280A JP 19128083 A JP19128083 A JP 19128083A JP S6083229 A JPS6083229 A JP S6083229A
Authority
JP
Japan
Prior art keywords
photodetector
light
reflected light
optical
focus
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.)
Granted
Application number
JP58191280A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0554179B2 (enrdf_load_html_response
Inventor
Kazuo Okada
和夫 岡田
Shinsuke Shikama
信介 鹿間
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 true JPS6083229A (ja) 1985-05-11
JPH0554179B2 JPH0554179B2 (enrdf_load_html_response) 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 (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6822209B2 (en) 2000-11-15 2004-11-23 Sharp Kabushiki Kaisha Focal point dislocation detecting method and optical pickup apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50104539A (enrdf_load_html_response) * 1974-01-15 1975-08-18
JPS5339123A (en) * 1976-09-22 1978-04-10 Canon Inc Automatic winder of cameras

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50104539A (enrdf_load_html_response) * 1974-01-15 1975-08-18
JPS5339123A (en) * 1976-09-22 1978-04-10 Canon Inc Automatic winder of cameras

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6822209B2 (en) 2000-11-15 2004-11-23 Sharp Kabushiki Kaisha Focal point dislocation detecting method and optical pickup apparatus

Also Published As

Publication number Publication date
JPH0554179B2 (enrdf_load_html_response) 1993-08-11

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Legal Events

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