GB1553440A - Optical focussing sensor - Google Patents

Optical focussing sensor

Info

Publication number
GB1553440A
GB1553440A GB40082/76A GB4008276A GB1553440A GB 1553440 A GB1553440 A GB 1553440A GB 40082/76 A GB40082/76 A GB 40082/76A GB 4008276 A GB4008276 A GB 4008276A GB 1553440 A GB1553440 A GB 1553440A
Authority
GB
United Kingdom
Prior art keywords
optical focussing
sensor
focussing sensor
optical
focussing
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
Application number
GB40082/76A
Other languages
English (en)
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.)
Thomson-Brandt SA
Original Assignee
Thomson-Brandt SA
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 Thomson-Brandt SA filed Critical Thomson-Brandt SA
Publication of GB1553440A publication Critical patent/GB1553440A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/16—Beam splitting or combining systems used as aids for focusing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane
    • 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
    • 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
    • G11B7/0916—Foucault or knife-edge 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
    • G11B7/0908—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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Microscoopes, Condenser (AREA)
GB40082/76A 1975-09-29 1976-09-27 Optical focussing sensor Expired GB1553440A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7529705A FR2325953A1 (fr) 1975-09-29 1975-09-29 Senseur optique de focalisation et dispositif de focalisation comportant un tel senseur

Publications (1)

Publication Number Publication Date
GB1553440A true GB1553440A (en) 1979-09-26

Family

ID=9160559

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40082/76A Expired GB1553440A (en) 1975-09-29 1976-09-27 Optical focussing sensor

Country Status (6)

Country Link
US (1) US4079248A (enExample)
JP (1) JPS5242742A (enExample)
CA (1) CA1073253A (enExample)
DE (1) DE2643975C2 (enExample)
FR (1) FR2325953A1 (enExample)
GB (1) GB1553440A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122045A (en) * 1982-05-25 1984-01-04 Leitz Ernst Gmbh Automatic focussing

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FR2462758A1 (fr) * 1979-08-03 1981-02-13 Thomson Csf Dispositif optique d'acces a une piste portee par un support d'information et systeme de memoire optique comportant un tel dispositif
FR2483664B1 (fr) * 1980-05-28 1985-06-28 Thomson Csf Dispositif optique d'enregistrement-lecture sur un support d'informations et systeme de memoire optique comprenant un tel dispositif
JPS5744236A (en) * 1980-08-29 1982-03-12 Matsushita Electric Ind Co Ltd Optical information reproducer
JPS57108811A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Optical focus position detector
DE3280232D1 (de) * 1981-06-22 1990-09-27 Toshiba Kawasaki Kk Optischer kopf.
US4521680A (en) * 1981-07-20 1985-06-04 Tokyo Shibaura Denki Kabushiki Kaisha System for focusing a light beam on a light reflecting surface
EP0075192B1 (en) * 1981-09-17 1990-03-14 Kabushiki Kaisha Toshiba An optical head
JPS5870434A (ja) * 1981-10-22 1983-04-26 Toshiba Corp 光学ヘツド
US4441175A (en) * 1982-01-25 1984-04-03 Magnetic Peripherals Inc. Partial beam focus sensing in an optical recording system
DE3204876C2 (de) * 1982-02-12 1986-10-16 Helmut Dr.rer.nat. 8000 München Krueger Vorrichtung zur Bestimmung des Refraktionszustandes des menschlichen Auges
US4630927A (en) * 1983-02-15 1986-12-23 General Electric Company Optical projector
JPS6010425A (ja) * 1983-06-30 1985-01-19 Toshiba Corp 光学ヘツド
US4665512A (en) * 1983-09-29 1987-05-12 Kabushiki Kaisha Toshiba Optical head for erasing
EP0147620B1 (en) * 1983-11-22 1991-06-05 Kabushiki Kaisha Toshiba Optical head
JPS60145764A (ja) * 1984-01-10 1985-08-01 Dainippon Screen Mfg Co Ltd 画像走査記録方法
US4684797A (en) * 1984-02-29 1987-08-04 Kabushiki Kaisha Toshiba Optical system and method for reducing vibration of an objective lens in an optical head assembly of an optical read/write system
JPS60197950A (ja) * 1984-03-22 1985-10-07 Toshiba Corp 光学ヘツド
JPS60253027A (ja) * 1984-05-29 1985-12-13 Canon Inc 光学的情報処理装置
JPH069090B2 (ja) * 1984-06-12 1994-02-02 株式会社東芝 光学ヘツド
EP0225564A3 (en) * 1985-11-30 1988-07-06 Kabushiki Kaisha Toshiba Optical head
EP0224853B1 (en) * 1985-11-30 1992-02-05 Kabushiki Kaisha Toshiba Optical head
US5231621A (en) * 1986-09-05 1993-07-27 Canon Kabushiki Kaisha Focus detector which serves to split off a portion of a detected light beam only when the detected light beam is not refocused at an expected refocus point
JPH0734264B2 (ja) * 1986-09-05 1995-04-12 キヤノン株式会社 光学式情報記録再生装置
JPS63163313A (ja) * 1986-12-25 1988-07-06 Mitaka Koki Kk 非接触自動焦点位置合わせ装置
FR2620537B1 (fr) * 1987-09-14 1991-07-26 Micro Controle Dispositif optique a mise au point automatique et appareil optique comportant un tel dispositif
US5036185A (en) * 1988-12-27 1991-07-30 Kabushiki Kaisha Toshiba Optical apparatus for detecting a focusing state
US5281797A (en) * 1991-12-26 1994-01-25 Hitachi, Ltd. Short wavelength optical disk head having a changeable aperture
US5453962A (en) * 1992-08-20 1995-09-26 Mitsubishi Denki Kabushiki Kaisha Focus error detecting device
US5353272A (en) * 1992-12-29 1994-10-04 Eastman Kodak Company Apparatus and method for a modified half-aperture focus/tracking/data sensor system
US5360970A (en) * 1992-12-29 1994-11-01 Eastman Kodak Company Apparatus and method for a single return path signal sensor system
US5406541A (en) * 1992-12-29 1995-04-11 Eastman Kodak Company Apparatus and method for a dual half-aperture focus sensor system
JP3019181B2 (ja) * 1993-12-27 2000-03-13 日本電気株式会社 光ヘッドのサーボ信号検出装置
JP3368091B2 (ja) * 1994-04-22 2003-01-20 キヤノン株式会社 投影露光装置及びデバイスの製造方法
FR2723243B1 (fr) * 1994-07-26 1996-09-06 Thomson Csf Dispositif d'enregistrement et/ou de lecture de tetes magnetiques et son procede de realisation
FR2739965B1 (fr) * 1995-10-17 1997-11-07 Thomson Csf Dispositif emetteur-recepteur de lumiere et systeme de lecture optique
FR2786345B1 (fr) 1998-11-24 2001-02-09 Thomson Csf Dispositif de cryptage quantique
US7149173B2 (en) * 2000-10-17 2006-12-12 Thales Medium for recording optically readable data, method for making same and optical system reproducing said data
FR2824905B1 (fr) * 2001-05-15 2003-08-29 Thomson Csf Gyrometre a fibre optique
JP3809803B2 (ja) * 2002-02-15 2006-08-16 オムロン株式会社 変位センサ
DE10234756B3 (de) * 2002-07-30 2004-02-12 Leica Microsystems Semiconductor Gmbh Autofokusmodul für mikroskopbasierte Systeme
FI20031143A0 (fi) * 2003-08-08 2003-08-08 Wallac Oy Optinen fokusointimenetelmä ja -järjestely
EP2406679B1 (de) 2009-03-11 2017-01-25 Sakura Finetek U.S.A., Inc. Autofokusverfahren und autofokuseinrichtung
US10139613B2 (en) 2010-08-20 2018-11-27 Sakura Finetek U.S.A., Inc. Digital microscope and method of sensing an image of a tissue sample
DE102013103971A1 (de) 2013-04-19 2014-11-06 Sensovation Ag Verfahren zum Erzeugen eines aus mehreren Teilbildern zusammengesetzten Gesamtbilds eines Objekts
US10007102B2 (en) 2013-12-23 2018-06-26 Sakura Finetek U.S.A., Inc. Microscope with slide clamping assembly
EP3387370B1 (en) 2015-12-09 2019-12-11 Quality Vision International, Inc. Focusing system for a telecentric optical measuring machine
US11280803B2 (en) 2016-11-22 2022-03-22 Sakura Finetek U.S.A., Inc. Slide management system
JP7141857B2 (ja) * 2018-05-31 2022-09-26 川崎重工業株式会社 ロボットシステム、及びロボットシステムの制御方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418477A (en) * 1966-09-28 1968-12-24 Sylvania Electric Prod Apparatus for determining the focal point of a light beam
DE2102922C3 (de) * 1971-01-22 1978-08-24 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Anordnung zum selbsttätigen Fokussieren auf in optischen Geräten zu betrachtende Objekte
AR205243A1 (es) * 1972-05-11 1976-04-21 Philips Nv Aparato para la lectura de un portador de grabacion reflector plano
FR2222666B1 (enExample) * 1973-03-19 1976-11-05 Thomson Brandt
NL7402504A (nl) * 1974-02-25 1975-08-27 Philips Nv Inrichting voor het langs optische weg uitlezen van een registratiedrager.
US3904870A (en) * 1973-10-09 1975-09-09 Honeywell Inc Focus detecting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122045A (en) * 1982-05-25 1984-01-04 Leitz Ernst Gmbh Automatic focussing

Also Published As

Publication number Publication date
FR2325953A1 (fr) 1977-04-22
DE2643975C2 (de) 1983-07-07
US4079248A (en) 1978-03-14
JPS5242742A (en) 1977-04-02
JPS6218973B2 (enExample) 1987-04-25
DE2643975A1 (de) 1977-04-07
CA1073253A (en) 1980-03-11
FR2325953B1 (enExample) 1978-03-17

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19960926