DE3580181D1 - Optische fokussierungsermittlung gebrauchmachend von rotierenden interferenz-mustern. - Google Patents

Optische fokussierungsermittlung gebrauchmachend von rotierenden interferenz-mustern.

Info

Publication number
DE3580181D1
DE3580181D1 DE8585101926T DE3580181T DE3580181D1 DE 3580181 D1 DE3580181 D1 DE 3580181D1 DE 8585101926 T DE8585101926 T DE 8585101926T DE 3580181 T DE3580181 T DE 3580181T DE 3580181 D1 DE3580181 D1 DE 3580181D1
Authority
DE
Germany
Prior art keywords
interference patterns
optical focusing
focusing determination
rotating interference
rotating
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
DE8585101926T
Other languages
English (en)
Inventor
Donald Kenneth Cohen
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Application granted granted Critical
Publication of DE3580181D1 publication Critical patent/DE3580181D1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
DE8585101926T 1984-04-16 1985-02-22 Optische fokussierungsermittlung gebrauchmachend von rotierenden interferenz-mustern. Expired - Fee Related DE3580181D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/600,863 US4604739A (en) 1984-04-16 1984-04-16 Optical focus detection employing rotated interference patterns

Publications (1)

Publication Number Publication Date
DE3580181D1 true DE3580181D1 (de) 1990-11-29

Family

ID=24405359

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8585101926T Expired - Fee Related DE3580181D1 (de) 1984-04-16 1985-02-22 Optische fokussierungsermittlung gebrauchmachend von rotierenden interferenz-mustern.

Country Status (4)

Country Link
US (1) US4604739A (de)
EP (1) EP0158790B1 (de)
JP (1) JPS60219639A (de)
DE (1) DE3580181D1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8601876A (nl) * 1986-07-18 1988-02-16 Philips Nv Inrichting voor het aftasten van een optische registratiedrager.
US4850673A (en) * 1987-11-23 1989-07-25 U. S. Philips Corporation Optical scanning apparatus which detects scanning spot focus error
US4998233A (en) * 1988-02-12 1991-03-05 International Business Machines Corporation Acquiring focus in optical systems using a focus error signal and a laser drive signal
US5065387A (en) * 1988-04-07 1991-11-12 Insite Peripherals, Inc. Method and apparatus for generating tracking error signals by means of an optical servo system
US5036185A (en) * 1988-12-27 1991-07-30 Kabushiki Kaisha Toshiba Optical apparatus for detecting a focusing state
US5446710A (en) * 1992-11-06 1995-08-29 International Business Machines Corporation Focus error detection using an equal path length lateral shearing interferometer
US6573997B1 (en) 2000-07-17 2003-06-03 The Regents Of California Hybrid shearing and phase-shifting point diffraction interferometer
EP1804100B1 (de) * 2005-12-30 2018-02-21 Datalogic IP TECH S.r.l. Verfahren und Vorrichtung zur Fokussierung eines Laserstrahls

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345912A (en) * 1964-03-10 1967-10-10 Ibm Rotary shearing interferometer
JPS5515685B2 (de) * 1972-06-30 1980-04-25
DE2527223C2 (de) * 1975-06-19 1985-06-20 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Abtastgitter für einen Schärfedetektor
GB1532345A (en) * 1976-06-25 1978-11-15 Hitachi Ltd Information play-back apparatus
JPS54106206A (en) * 1978-02-08 1979-08-21 Matsushita Electric Ind Co Ltd Optical recorder
NL7808638A (nl) * 1978-08-22 1980-02-26 Philips Nv Inrichting voor het uitlezen van een schijfvormige re- gistratiedrager.
JPS5690434A (en) * 1979-12-19 1981-07-22 Hitachi Ltd Optical information reproducing device
JPS573235A (en) * 1980-06-07 1982-01-08 Ricoh Co Ltd Focus controlling method
JPS5733441A (en) * 1980-08-07 1982-02-23 Matsushita Electric Ind Co Ltd Optical information recorder and reproducer
US4381557A (en) * 1980-12-19 1983-04-26 Rca Corporation Optical focus sensor
JPS57108811A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Optical focus position detector
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
JPS58108505A (ja) * 1981-12-23 1983-06-28 Olympus Optical Co Ltd 合焦検出装置
FR2523350B1 (fr) * 1982-03-09 1987-05-22 Thomson Csf Tete optique dans un dispositif d'enregistrement-lecture d'un support d'information
JPS59124041A (ja) * 1982-12-29 1984-07-18 Canon Inc 焦点制御装置

Also Published As

Publication number Publication date
EP0158790A3 (en) 1988-01-20
EP0158790A2 (de) 1985-10-23
EP0158790B1 (de) 1990-10-24
JPS60219639A (ja) 1985-11-02
US4604739A (en) 1986-08-05

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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