JPS5587328A - Automatic focus control unit - Google Patents

Automatic focus control unit

Info

Publication number
JPS5587328A
JPS5587328A JP15852978A JP15852978A JPS5587328A JP S5587328 A JPS5587328 A JP S5587328A JP 15852978 A JP15852978 A JP 15852978A JP 15852978 A JP15852978 A JP 15852978A JP S5587328 A JPS5587328 A JP S5587328A
Authority
JP
Japan
Prior art keywords
output
laser beam
lens
reception
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.)
Granted
Application number
JP15852978A
Other languages
English (en)
Other versions
JPS5821334B2 (ja
Inventor
Takahisa Aikawa
Shigeo Tsuji
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
Tokyo Shibaura Electric Co Ltd
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, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP53158529A priority Critical patent/JPS5821334B2/ja
Priority to US06/104,803 priority patent/US4296316A/en
Publication of JPS5587328A publication Critical patent/JPS5587328A/ja
Publication of JPS5821334B2 publication Critical patent/JPS5821334B2/ja
Expired 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
    • G11B7/133—Shape of individual detector 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
    • G11B7/094—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
    • G11B7/08—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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
JP53158529A 1978-12-25 1978-12-25 自動焦点調節装置 Expired JPS5821334B2 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP53158529A JPS5821334B2 (ja) 1978-12-25 1978-12-25 自動焦点調節装置
US06/104,803 US4296316A (en) 1978-12-25 1979-12-18 Optical focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53158529A JPS5821334B2 (ja) 1978-12-25 1978-12-25 自動焦点調節装置

Publications (2)

Publication Number Publication Date
JPS5587328A true JPS5587328A (en) 1980-07-02
JPS5821334B2 JPS5821334B2 (ja) 1983-04-28

Family

ID=15673715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53158529A Expired JPS5821334B2 (ja) 1978-12-25 1978-12-25 自動焦点調節装置

Country Status (2)

Country Link
US (1) US4296316A (ja)
JP (1) JPS5821334B2 (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59185036A (ja) * 1983-04-01 1984-10-20 Sankyo Seiki Mfg Co Ltd 光学情報再生装置
JPS59215029A (ja) * 1983-05-20 1984-12-04 Sankyo Seiki Mfg Co Ltd 光学情報再生装置
US4625303A (en) * 1983-09-05 1986-11-25 Mitsubishi Denki Kabushiki Kaisha Automatic focusing device
JPH01241027A (ja) * 1988-03-23 1989-09-26 Hitachi Ltd 光ピックアップ
JPH01269238A (ja) * 1988-04-20 1989-10-26 Sony Corp 光記録／再生装置のフォーカス検出装置

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5752005A (en) * 1980-08-19 1982-03-27 Olympus Optical Co Ltd Focus detecting method
JPS5752006A (en) * 1980-08-19 1982-03-27 Olympus Optical Co Ltd Method and device for detecting focus
JPS5774837A (en) * 1980-10-25 1982-05-11 Olympus Optical Co Ltd Signal detection system of optical information reproducing device
FR2498341A1 (fr) * 1981-01-20 1982-07-23 Thomson Csf Dispositif optique detecteur d'ecart de focalisation et enregistreur lecteur optique comportant un tel dispositif
DE3280137D1 (de) * 1981-09-17 1990-04-19 Toshiba Kawasaki Kk Ein optischer kopf.
JPS58208944A (ja) * 1982-05-31 1983-12-05 Sony Corp 光学ヘツド制御信号発生装置
US4641296A (en) * 1983-04-28 1987-02-03 Nippon Kogaku K.K. Optical head for information recording apparatus
DE3484723D1 (de) * 1983-09-05 1991-07-25 Mitsubishi Electric Corp Automatisches fokussierungsverfahren.
NL8400674A (nl) * 1984-03-02 1985-10-01 Philips Nv Inrichting voor het inschrijven en/of uitlezen van informatie in een spoor van een reflekterende registratiedrager, met een fokusregeling met verminderde spot offsetgevoeligheid.
EP0157020B1 (en) * 1984-04-05 1989-03-15 Agfa-Gevaert N.V. Device for accurately focussing a laser beam
NL8403034A (nl) * 1984-10-05 1986-05-01 Philips Nv Opto-elektronisch fokusfout-detektiestelsel.
JPS61264521A (ja) * 1985-05-20 1986-11-22 Hitachi Ltd 光学式読取再生装置
GB2183419B (en) * 1985-10-22 1990-08-29 Canon Kk Focusing state detection apparatus for objective lens
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
JPS63257925A (ja) * 1987-04-15 1988-10-25 Nippon Coinco:Kk 光ヘツドの焦点制御信号検出装置
JPH0163434U (ja) * 1987-10-19 1989-04-24
JPH03185633A (ja) * 1989-12-13 1991-08-13 Matsushita Electric Ind Co Ltd 光記録再生装置
JPH11271600A (ja) * 1998-03-25 1999-10-08 Minolta Co Ltd 距離検出装置
KR100765741B1 (ko) * 2001-07-26 2007-10-15 삼성전자주식회사 일 매의 렌즈로 된 고개구수의 대물렌즈 및 이를 채용한광픽업장치

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079247A (en) * 1975-05-16 1978-03-14 Claude Bricot Optical focussing device
NL7708200A (nl) * 1976-07-28 1978-01-31 Hitachi Ltd Automatische scherpstellingsinrichting.
NL186205C (nl) * 1977-12-17 1990-10-01 Victor Company Of Japan Inrichting voor het optisch registreren van signalen op een registratiemedium.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59185036A (ja) * 1983-04-01 1984-10-20 Sankyo Seiki Mfg Co Ltd 光学情報再生装置
JPS59215029A (ja) * 1983-05-20 1984-12-04 Sankyo Seiki Mfg Co Ltd 光学情報再生装置
US4625303A (en) * 1983-09-05 1986-11-25 Mitsubishi Denki Kabushiki Kaisha Automatic focusing device
JPH01241027A (ja) * 1988-03-23 1989-09-26 Hitachi Ltd 光ピックアップ
JPH01269238A (ja) * 1988-04-20 1989-10-26 Sony Corp 光記録／再生装置のフォーカス検出装置

Also Published As

Publication number Publication date
US4296316A (en) 1981-10-20
JPS5821334B2 (ja) 1983-04-28

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