FR2402222A1 - METHOD OF DETECTION OF THE FOCUS OF AN OPTICAL DEVICE - Google Patents

METHOD OF DETECTION OF THE FOCUS OF AN OPTICAL DEVICE

Info

Publication number
FR2402222A1
FR2402222A1 FR7825332A FR7825332A FR2402222A1 FR 2402222 A1 FR2402222 A1 FR 2402222A1 FR 7825332 A FR7825332 A FR 7825332A FR 7825332 A FR7825332 A FR 7825332A FR 2402222 A1 FR2402222 A1 FR 2402222A1
Authority
FR
France
Prior art keywords
focus
optical device
elements
detection
group
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
FR7825332A
Other languages
French (fr)
Other versions
FR2402222B1 (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.)
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
Priority claimed from JP10471377A external-priority patent/JPS5439126A/en
Priority claimed from JP4586778A external-priority patent/JPS54138427A/en
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Publication of FR2402222A1 publication Critical patent/FR2402222A1/en
Application granted granted Critical
Publication of FR2402222B1 publication Critical patent/FR2402222B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

L'invention concerne les dispositifs optiques. Pour détecter les conditions dans lesquelles un dispositif optique est au point, on utilise deux groupes d'éléments photosensibles 20 et 21. Les éléments du groupe 20 sont relativement écartés les uns des autres, et les signaux qu'ils fournissent sont utilisés lorsque le dispositif est très éloigné des conditions qui correspondent à une mise au point parfaite, tandis que les éléments du groupe 21 sont relativement rapprochés les uns des autres et interviennent lorsque le dispositif optique est presque au point. Application à la mise au point automatique des appareils photographiques.The invention relates to optical devices. To detect the conditions under which an optical device is in focus, two groups of photosensitive elements 20 and 21 are used. The elements of group 20 are relatively spaced apart from each other, and the signals they provide are used when the device. is very far from the conditions which correspond to a perfect focus, while the elements of group 21 are relatively close to each other and intervene when the optical device is almost in focus. Application to the automatic focusing of photographic cameras.

FR7825332A 1977-09-02 1978-09-01 METHOD OF DETECTION OF THE FOCUS OF AN OPTICAL DEVICE Granted FR2402222A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10471377A JPS5439126A (en) 1977-09-02 1977-09-02 Automatic focusing method
JP4586778A JPS54138427A (en) 1978-04-20 1978-04-20 Focus detecting method

Publications (2)

Publication Number Publication Date
FR2402222A1 true FR2402222A1 (en) 1979-03-30
FR2402222B1 FR2402222B1 (en) 1983-05-27

Family

ID=26385961

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7825332A Granted FR2402222A1 (en) 1977-09-02 1978-09-01 METHOD OF DETECTION OF THE FOCUS OF AN OPTICAL DEVICE

Country Status (3)

Country Link
DE (1) DE2838121B2 (en)
FR (1) FR2402222A1 (en)
GB (1) GB2003692B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017726A1 (en) * 1979-03-20 1980-10-29 Kernforschungszentrum Karlsruhe Gmbh Method and device for automatically focusing an image

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529878A (en) * 1978-08-24 1980-03-03 Asahi Optical Co Ltd Focus detector of camera
JPS5589819A (en) 1978-12-28 1980-07-07 Asahi Optical Co Ltd Focus detector of camera
US4561749A (en) * 1983-02-02 1985-12-31 Nippon Kogaku K.K. Focus detection apparatus
US4687914A (en) * 1983-04-01 1987-08-18 Canon Kabushiki Kaisha Distance measuring device comprising a two sectioned sensor, each section having a plurality of sensing areas
JPS60101513A (en) * 1983-11-08 1985-06-05 Canon Inc Focus detector
DE10033483C1 (en) 2000-07-10 2002-01-03 Zsp Geodaetische Sys Gmbh Auto-focusing method for telescopes of surveying equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2514230A1 (en) * 1974-04-01 1975-10-09 Canon Kk SYSTEM FOR EXPOSURE MEASUREMENT AND / OR FOR FOCUS DETERMINATION WITH THE HELP OF AN IMAGE SENSOR
DE2551070A1 (en) * 1974-11-13 1976-05-26 Canon Kk METHOD OF DETERMINING THE SHARPNESS OF AN OBJECT IMAGE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2514230A1 (en) * 1974-04-01 1975-10-09 Canon Kk SYSTEM FOR EXPOSURE MEASUREMENT AND / OR FOR FOCUS DETERMINATION WITH THE HELP OF AN IMAGE SENSOR
DE2559559A1 (en) * 1974-04-01 1977-06-16 Canon Kk CAMERA WITH EXPOSURE METERING SYSTEM
DE2551070A1 (en) * 1974-11-13 1976-05-26 Canon Kk METHOD OF DETERMINING THE SHARPNESS OF AN OBJECT IMAGE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017726A1 (en) * 1979-03-20 1980-10-29 Kernforschungszentrum Karlsruhe Gmbh Method and device for automatically focusing an image

Also Published As

Publication number Publication date
GB2003692B (en) 1982-08-11
FR2402222B1 (en) 1983-05-27
DE2838121C3 (en) 1980-09-11
DE2838121A1 (en) 1979-03-22
DE2838121B2 (en) 1980-01-17
GB2003692A (en) 1979-03-14

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Legal Events

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ST Notification of lapse