DE69123285T2 - Automatische Fokussierungsvorrichtung und Verfahren - Google Patents

Automatische Fokussierungsvorrichtung und Verfahren

Info

Publication number
DE69123285T2
DE69123285T2 DE69123285T DE69123285T DE69123285T2 DE 69123285 T2 DE69123285 T2 DE 69123285T2 DE 69123285 T DE69123285 T DE 69123285T DE 69123285 T DE69123285 T DE 69123285T DE 69123285 T2 DE69123285 T2 DE 69123285T2
Authority
DE
Germany
Prior art keywords
automatic focusing
focusing device
automatic
focusing
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
DE69123285T
Other languages
English (en)
Other versions
DE69123285D1 (de
Inventor
Sadao Mori
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Application granted granted Critical
Publication of DE69123285D1 publication Critical patent/DE69123285D1/de
Publication of DE69123285T2 publication Critical patent/DE69123285T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G11B7/085—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
    • 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
    • G11B7/1372—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • 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
DE69123285T 1990-05-02 1991-05-02 Automatische Fokussierungsvorrichtung und Verfahren Expired - Fee Related DE69123285T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2115093A JP2724232B2 (ja) 1990-05-02 1990-05-02 自動焦点手段およびその自動焦点手段を用いた光ディスク装置

Publications (2)

Publication Number Publication Date
DE69123285D1 DE69123285D1 (de) 1997-01-09
DE69123285T2 true DE69123285T2 (de) 1997-06-12

Family

ID=14654033

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69123285T Expired - Fee Related DE69123285T2 (de) 1990-05-02 1991-05-02 Automatische Fokussierungsvorrichtung und Verfahren

Country Status (5)

Country Link
US (1) US5148010A (de)
EP (1) EP0455249B1 (de)
JP (1) JP2724232B2 (de)
KR (1) KR940008404B1 (de)
DE (1) DE69123285T2 (de)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5619488A (en) * 1991-09-07 1997-04-08 Fuji Xerox Co., Ltd. Information recording device
EP0592766B1 (de) * 1992-06-19 1998-09-16 Sony Corporation Verfahren zur Einstellung der optischen Achse eines optischen Systems
US6654061B2 (en) * 1995-06-14 2003-11-25 Canon Kabushiki Kaisha Automatic focus adjusting apparatus and method utilized by an image sensing apparatus
GB2307549B (en) * 1995-11-23 1999-10-20 Thomson Multimedia Sa Optical pick-up device
JP3614294B2 (ja) 1998-03-09 2005-01-26 富士通株式会社 光強度変換素子及び光学装置及び情報記憶装置
DE19838087C2 (de) * 1998-03-09 2003-07-03 Fujitsu Ltd Lichtintensitätskonverter
EP2197645B1 (de) * 2007-09-06 2014-10-22 3M Innovative Properties Company Verfahren zum formen von formwerkzeugen und verfahren zum formen von artikeln unter verwendung der formwerkzeuge
JP5951928B2 (ja) 2007-09-06 2016-07-13 スリーエム イノベイティブ プロパティズ カンパニー 光出力の領域制御を提供する光抽出構造体を有する光ガイド
EP2205521A4 (de) * 2007-09-06 2013-09-11 3M Innovative Properties Co Werkzeug zur herstellung von mikrostrukturierten artikeln
US20100227272A1 (en) * 2007-10-11 2010-09-09 Innovative Properties Company Highly Functional Multiphoton Curable Reactive Species
WO2009048808A1 (en) * 2007-10-11 2009-04-16 3M Innovative Properties Company Chromatic confocal sensor
US8455846B2 (en) * 2007-12-12 2013-06-04 3M Innovative Properties Company Method for making structures with improved edge definition
WO2009108543A2 (en) 2008-02-26 2009-09-03 3M Innovative Properties Company Multi-photon exposure system
JP2010134328A (ja) * 2008-12-08 2010-06-17 Disco Abrasive Syst Ltd 偏光素子およびレーザーユニット
JP5464415B2 (ja) * 2009-09-16 2014-04-09 国立大学法人東北大学 光ビーム発生方法および光ビーム発生装置
WO2017008159A1 (en) * 2015-07-14 2017-01-19 Synergx Technologies Inc. Optical inspection system for transparent material
US10153838B1 (en) * 2016-12-28 2018-12-11 Facebook, Inc. Quad tracker with birefringent optics

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63224036A (ja) * 1987-03-13 1988-09-19 Hitachi Ltd 光ヘツド
JPS63271732A (ja) * 1987-04-30 1988-11-09 Hitachi Ltd 光ヘツド
JPH02143391A (ja) * 1988-11-25 1990-06-01 Ricoh Co Ltd 並列光情報処理装置
JP2657413B2 (ja) * 1989-03-03 1997-09-24 パイオニア株式会社 光ヘッド
US5005927A (en) * 1989-03-28 1991-04-09 The United States Of America As Represented By The Secretary Of The Air Force Nonlinear optical microscope

Also Published As

Publication number Publication date
KR910020672A (ko) 1991-12-20
JP2724232B2 (ja) 1998-03-09
KR940008404B1 (ko) 1994-09-14
US5148010A (en) 1992-09-15
EP0455249A3 (en) 1992-06-03
JPH0412331A (ja) 1992-01-16
DE69123285D1 (de) 1997-01-09
EP0455249B1 (de) 1996-11-27
EP0455249A2 (de) 1991-11-06

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee