JPS567246A - Method and unit for focus detection - Google Patents

Method and unit for focus detection

Info

Publication number
JPS567246A
JPS567246A JP7994379A JP7994379A JPS567246A JP S567246 A JPS567246 A JP S567246A JP 7994379 A JP7994379 A JP 7994379A JP 7994379 A JP7994379 A JP 7994379A JP S567246 A JPS567246 A JP S567246A
Authority
JP
Japan
Prior art keywords
disc
light
reflection
detecting
prism
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
JP7994379A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6227456B2 (en, 2012
Inventor
Toru Musha
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP7994379A priority Critical patent/JPS567246A/ja
Priority to GB8020097A priority patent/GB2057218B/en
Priority to FR8014007A priority patent/FR2459991A1/fr
Priority to NL8003659A priority patent/NL192406C/nl
Priority to DE19803023779 priority patent/DE3023779C2/de
Priority to US06/195,075 priority patent/US4390781A/en
Publication of JPS567246A publication Critical patent/JPS567246A/ja
Publication of JPS6227456B2 publication Critical patent/JPS6227456B2/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
    • G11B7/08—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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • 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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G11B2007/0924—Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
  • Laser Beam Processing (AREA)
JP7994379A 1979-06-25 1979-06-25 Method and unit for focus detection Granted JPS567246A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP7994379A JPS567246A (en) 1979-06-25 1979-06-25 Method and unit for focus detection
GB8020097A GB2057218B (en) 1979-06-25 1980-06-19 Detecting focussing error
FR8014007A FR2459991A1 (fr) 1979-06-25 1980-06-24 Procede et dispositif de detection d'un signal d'erreur de focalisation
NL8003659A NL192406C (nl) 1979-06-25 1980-06-24 Inrichting voor het detecteren van een focusseringsfoutsignaal voor een objectieflens bij het aftasten van een informatiedrager.
DE19803023779 DE3023779C2 (de) 1979-06-25 1980-06-25 Verfahren und Vorrichtung zum Erzeugen eines Fokussierfehlersignales für ein Objektiv
US06/195,075 US4390781A (en) 1979-06-25 1980-10-08 Method and apparatus for detecting focussing error signal of objective lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7994379A JPS567246A (en) 1979-06-25 1979-06-25 Method and unit for focus detection

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP14681386A Division JPS6224443A (ja) 1986-06-25 1986-06-25 焦点検出装置

Publications (2)

Publication Number Publication Date
JPS567246A true JPS567246A (en) 1981-01-24
JPS6227456B2 JPS6227456B2 (en, 2012) 1987-06-15

Family

ID=13704387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7994379A Granted JPS567246A (en) 1979-06-25 1979-06-25 Method and unit for focus detection

Country Status (2)

Country Link
US (1) US4390781A (en, 2012)
JP (1) JPS567246A (en, 2012)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57132114A (en) * 1981-02-07 1982-08-16 Olympus Optical Co Ltd Dividing method of light flux
JPS58120216A (ja) * 1982-01-11 1983-07-18 Olympus Optical Co Ltd 光束合成装置
JPS58143438A (ja) * 1982-02-18 1983-08-26 Sanyo Electric Co Ltd 光学式ピツクアツプ装置
JPS5983116A (ja) * 1982-11-02 1984-05-14 Olympus Optical Co Ltd 光学系の調整装置
JPS6043240A (ja) * 1983-08-19 1985-03-07 Mitsubishi Electric Corp 光学的信号読出装置
US4525825A (en) * 1980-10-09 1985-06-25 Olympus Optical Co., Ltd. Method and apparatus for detecting focussing and tracking error signals
US4862442A (en) * 1987-04-20 1989-08-29 Mitsubishi Denki Kabushiki Kaisha Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity
JPH0643152U (ja) * 1992-11-06 1994-06-07 有限会社住幸 屋根工事用安全柵
US5526165A (en) * 1992-08-21 1996-06-11 Olympus Optical Co., Ltd. Scanner system

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
US4505584A (en) * 1981-01-22 1985-03-19 Olympus Optical Co., Ltd. Method and apparatus for detecting focussing error signal of objective lens
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
DE3280232D1 (de) * 1981-06-22 1990-09-27 Toshiba Kawasaki Kk Optischer kopf.
JPS5936338A (ja) * 1982-08-24 1984-02-28 Matsushita Electric Ind Co Ltd 光デイスク記録再生方法
JPS5990007A (ja) * 1982-11-16 1984-05-24 Olympus Optical Co Ltd 光学式寸度測定装置
FR2546310B1 (fr) * 1983-05-20 1986-04-25 Thomson Csf Monture reglable pour miroir pivotant et tete optique d'enregistrement-lecture utilisant une telle monture
US4801794A (en) * 1984-05-29 1989-01-31 Xerox Corporation Data detection and optical focus error detection system for rotating optical media
US4652737A (en) * 1984-05-29 1987-03-24 Xerox Corporation Sampled optical focus error detecting system for rotating optical media
JPH069090B2 (ja) * 1984-06-12 1994-02-02 株式会社東芝 光学ヘツド
US4778984A (en) * 1985-10-16 1988-10-18 Canon Denshi Kabushiki Kaisha Apparatus for detecting focus from astigmatism
JPH02207716A (ja) * 1989-02-03 1990-08-17 Ikuya Yamakawa 苺の栽培方法
US5220397A (en) * 1992-03-25 1993-06-15 Peisen Huang Method and apparatus for angle measurement based on the internal reflection effect
US7731154B2 (en) * 2002-12-04 2010-06-08 Parsons Natan E Passive sensors for automatic faucets and bathroom flushers
CN1310220C (zh) 2003-11-17 2007-04-11 威盛电子股份有限公司 产生稳定功率控制信号方法及其装置
TWI261226B (en) * 2004-01-20 2006-09-01 Via Tech Inc Apparatus and method of dynamic adjusting the detection window
TWI261240B (en) 2004-08-17 2006-09-01 Via Tech Inc Method for determining data storage quality of optical disc
CN112113514B (zh) * 2020-09-22 2021-12-31 中国科学院长春光学精密机械与物理研究所 一种波前信息的检测方法、装置以及系统
US20240118200A1 (en) * 2020-12-08 2024-04-11 Arizona Board Of Regents On Behalf Of Arizona State University Critical angle reflection imaging for quantification of molecular interactions

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4357533A (en) * 1980-07-14 1982-11-02 Discovision Associates Focus detector for an optical disc playback system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525825A (en) * 1980-10-09 1985-06-25 Olympus Optical Co., Ltd. Method and apparatus for detecting focussing and tracking error signals
JPS57132114A (en) * 1981-02-07 1982-08-16 Olympus Optical Co Ltd Dividing method of light flux
JPS58120216A (ja) * 1982-01-11 1983-07-18 Olympus Optical Co Ltd 光束合成装置
JPS58143438A (ja) * 1982-02-18 1983-08-26 Sanyo Electric Co Ltd 光学式ピツクアツプ装置
JPS5983116A (ja) * 1982-11-02 1984-05-14 Olympus Optical Co Ltd 光学系の調整装置
JPS6043240A (ja) * 1983-08-19 1985-03-07 Mitsubishi Electric Corp 光学的信号読出装置
US4862442A (en) * 1987-04-20 1989-08-29 Mitsubishi Denki Kabushiki Kaisha Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity
US5526165A (en) * 1992-08-21 1996-06-11 Olympus Optical Co., Ltd. Scanner system
US5835251A (en) * 1992-08-21 1998-11-10 Olympus Optical Co., Ltd. Scanner system
JPH0643152U (ja) * 1992-11-06 1994-06-07 有限会社住幸 屋根工事用安全柵

Also Published As

Publication number Publication date
JPS6227456B2 (en, 2012) 1987-06-15
US4390781A (en) 1983-06-28

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