FR2431680A1 - METHOD AND APPARATUS FOR ELECTRONIC DETECTION OF THE FIREPLACE OF TAKING APPARATUS OR SIMILAR OPTICAL INSTRUMENTS - Google Patents

METHOD AND APPARATUS FOR ELECTRONIC DETECTION OF THE FIREPLACE OF TAKING APPARATUS OR SIMILAR OPTICAL INSTRUMENTS

Info

Publication number
FR2431680A1
FR2431680A1 FR7917155A FR7917155A FR2431680A1 FR 2431680 A1 FR2431680 A1 FR 2431680A1 FR 7917155 A FR7917155 A FR 7917155A FR 7917155 A FR7917155 A FR 7917155A FR 2431680 A1 FR2431680 A1 FR 2431680A1
Authority
FR
France
Prior art keywords
signals
digital
analog
optical instruments
similar optical
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
FR7917155A
Other languages
French (fr)
Other versions
FR2431680B1 (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 JP7974178A external-priority patent/JPS558102A/en
Priority claimed from JP12719078A external-priority patent/JPS5553304A/en
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Publication of FR2431680A1 publication Critical patent/FR2431680A1/en
Application granted granted Critical
Publication of FR2431680B1 publication Critical patent/FR2431680B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C3/00—Measuring distances in line of sight; Optical rangefinders
    • G01C3/32—Measuring distances in line of sight; Optical rangefinders by focusing the object, e.g. on a ground glass screen
    • 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
    • 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)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Image Analysis (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un procédé et un appareil de détermination électronique du foyer pour appareils de prise de vues ou instruments optiques analogues. L'appareil permet de comparer des signaux analogiques délivrés par un ensemble 3 d'éléments détecteurs de lumière avec des signaux analogiques délivrés, dans un circuit 4 de traitement de signaux d'image, par un convertisseur numérique-analogique par l'intermédiaire de plusieurs circuits comparateurs dont les signaux analogiques de sortie sont délivrés, comme signaux d'autorisation d'enregistrement en mémoire, à plusieurs mémoires numériques qui sont commandées par des signaux numériques délivrés par un circuit de commande central 5, si bien que les informations d'intensité d'éclairement de chaque élément d'image de l'ensemble 3 sont lues sous forme de signaux numériques dans les mémoires numériques. L'appareil traitant les informations en parallèle permet d'obtenir simultanément les données nécessaires à la détermination du foyer.The invention relates to a method and an apparatus for electronically determining the focus for cameras or similar optical instruments. The apparatus makes it possible to compare analog signals delivered by a set 3 of light detection elements with analog signals delivered, in a circuit 4 for processing image signals, by a digital-to-analog converter via several comparator circuits whose analog output signals are supplied, as memory recording authorization signals, to several digital memories which are controlled by digital signals supplied by a central control circuit 5, so that the intensity information of illumination of each picture element of the set 3 are read in the form of digital signals in the digital memories. The device processing the information in parallel makes it possible to simultaneously obtain the data necessary for the determination of the focus.

FR7917155A 1978-07-03 1979-07-02 METHOD AND APPARATUS FOR ELECTRONIC DETECTION OF THE FIREPLACE OF TAKING APPARATUS OR SIMILAR OPTICAL INSTRUMENTS Granted FR2431680A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7974178A JPS558102A (en) 1978-07-03 1978-07-03 Picture signal process circuit
JP12719078A JPS5553304A (en) 1978-10-16 1978-10-16 Focus detector

Publications (2)

Publication Number Publication Date
FR2431680A1 true FR2431680A1 (en) 1980-02-15
FR2431680B1 FR2431680B1 (en) 1985-05-17

Family

ID=26420739

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7917155A Granted FR2431680A1 (en) 1978-07-03 1979-07-02 METHOD AND APPARATUS FOR ELECTRONIC DETECTION OF THE FIREPLACE OF TAKING APPARATUS OR SIMILAR OPTICAL INSTRUMENTS

Country Status (3)

Country Link
DE (1) DE2926898C2 (en)
FR (1) FR2431680A1 (en)
GB (1) GB2029659B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4782852A (en) * 1985-04-29 1988-11-08 Legris Assembly for perfecting fluid distribution in multiple conduits

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2551070A1 (en) * 1974-11-13 1976-05-26 Canon Kk METHOD OF DETERMINING THE SHARPNESS OF AN OBJECT IMAGE
US3967056A (en) * 1973-02-26 1976-06-29 Minolta Camera Kabushiki Kaisha Automatic focusing apparatus
US4047187A (en) * 1974-04-01 1977-09-06 Canon Kabushiki Kaisha System for exposure measurement and/or focus detection by means of image senser

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967056A (en) * 1973-02-26 1976-06-29 Minolta Camera Kabushiki Kaisha Automatic focusing apparatus
US4047187A (en) * 1974-04-01 1977-09-06 Canon Kabushiki Kaisha System for exposure measurement and/or focus detection by means of image senser
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
US4782852A (en) * 1985-04-29 1988-11-08 Legris Assembly for perfecting fluid distribution in multiple conduits

Also Published As

Publication number Publication date
DE2926898C2 (en) 1982-07-22
GB2029659A (en) 1980-03-19
FR2431680B1 (en) 1985-05-17
DE2926898A1 (en) 1980-01-24
GB2029659B (en) 1982-09-29

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