JPS57122410A - Focus detecting method - Google Patents

Focus detecting method

Info

Publication number
JPS57122410A
JPS57122410A JP714381A JP714381A JPS57122410A JP S57122410 A JPS57122410 A JP S57122410A JP 714381 A JP714381 A JP 714381A JP 714381 A JP714381 A JP 714381A JP S57122410 A JPS57122410 A JP S57122410A
Authority
JP
Japan
Prior art keywords
prism
detecting
refractive index
total reflection
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.)
Granted
Application number
JP714381A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0114561B2 (enExample
Inventor
Kiichi Kato
Toru Musha
Kenichi Ito
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 Corp
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 Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP714381A priority Critical patent/JPS57122410A/ja
Priority to US06/339,718 priority patent/US4505584A/en
Priority to NLAANVRAGE8200220,A priority patent/NL184245C/xx
Priority to KR8200249A priority patent/KR850001924B1/ko
Priority to FR8200918A priority patent/FR2498340A1/fr
Priority to DE3201964A priority patent/DE3201964C2/de
Priority to GB08201844A priority patent/GB2110499B/en
Publication of JPS57122410A publication Critical patent/JPS57122410A/ja
Publication of JPH0114561B2 publication Critical patent/JPH0114561B2/ja
Granted 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
    • 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
    • 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
    • G11B2007/0919—Critical angle methods

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP714381A 1981-01-22 1981-01-22 Focus detecting method Granted JPS57122410A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP714381A JPS57122410A (en) 1981-01-22 1981-01-22 Focus detecting method
US06/339,718 US4505584A (en) 1981-01-22 1982-01-15 Method and apparatus for detecting focussing error signal of objective lens
NLAANVRAGE8200220,A NL184245C (nl) 1981-01-22 1982-01-21 Inrichting voor het verkrijgen van een focusseringsfoutsignaal van een objectieflens met betrekking tot een voorwerp waarop door de objectieflens een lichtbundel moet worden gefocusseerd.
KR8200249A KR850001924B1 (en) 1981-01-22 1982-01-21 The method and apparatus for detecting a focussing error signal of objective lens
FR8200918A FR2498340A1 (fr) 1981-01-22 1982-01-21 Procede et appareil de detection d'un signal d'erreur de focalisation d'un objectif
DE3201964A DE3201964C2 (de) 1981-01-22 1982-01-22 Vorrichtung zum Scharfstellen eines Objektivs
GB08201844A GB2110499B (en) 1981-01-22 1982-01-22 Method and apparatus for detecting focussing error signal of objective lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP714381A JPS57122410A (en) 1981-01-22 1981-01-22 Focus detecting method

Publications (2)

Publication Number Publication Date
JPS57122410A true JPS57122410A (en) 1982-07-30
JPH0114561B2 JPH0114561B2 (enExample) 1989-03-13

Family

ID=11657845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP714381A Granted JPS57122410A (en) 1981-01-22 1981-01-22 Focus detecting method

Country Status (1)

Country Link
JP (1) JPS57122410A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08214489A (ja) * 1994-11-10 1996-08-20 Abb Ind Oy 電気装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08214489A (ja) * 1994-11-10 1996-08-20 Abb Ind Oy 電気装置

Also Published As

Publication number Publication date
JPH0114561B2 (enExample) 1989-03-13

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