FR2448732A1 - FOCUSING DETECTION DEVICE FOR A CAMERA - Google Patents

FOCUSING DETECTION DEVICE FOR A CAMERA

Info

Publication number
FR2448732A1
FR2448732A1 FR8002789A FR8002789A FR2448732A1 FR 2448732 A1 FR2448732 A1 FR 2448732A1 FR 8002789 A FR8002789 A FR 8002789A FR 8002789 A FR8002789 A FR 8002789A FR 2448732 A1 FR2448732 A1 FR 2448732A1
Authority
FR
France
Prior art keywords
camera
photo
detection device
electric element
scanning
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
FR8002789A
Other languages
French (fr)
Other versions
FR2448732B1 (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.)
Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Chemical Industry Co Ltd
Asahi Kasei Kogyo KK
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 JP1404279A external-priority patent/JPS55108627A/en
Priority claimed from JP1525479A external-priority patent/JPS55108628A/en
Application filed by Asahi Chemical Industry Co Ltd, Asahi Kasei Kogyo KK filed Critical Asahi Chemical Industry Co Ltd
Publication of FR2448732A1 publication Critical patent/FR2448732A1/en
Application granted granted Critical
Publication of FR2448732B1 publication Critical patent/FR2448732B1/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 UN DISPOSITIF DE DETECTION DE MISE AU POINT POUR UNE CAMERA. CE DISPOSITIF COMPREND UN ELEMENT PHOTO-ELECTRIQUE DU TYPE A AUTO-BALAYAGE 8, UN CIRCUIT DE BALAYAGE 13 POUR PRODUIRE UN SIGNAL CONSTANT DE L'IMAGE D'UN OBJET 6, UN ELEMENT PHOTO-ELECTRIQUE 9 DETERMINANT LA LUMINANCE MOYENNE DE L'OBJET 6, UN GENERATEUR D'IMPULSIONS D'HORLOGE 12 DESTINEES A COMMANDER L'ELEMENT PHOTO-ELECTRIQUE DU TYPE A AUTO-BALAYAGE 8, UN SYSTEME OPTIQUE 7 CONCU DE FACON A FORMER L'IMAGE DE L'OBJET 6 SUR L'ELEMENT PHOTO-ELECTRIQUE 9 DETERMINANT LA LUMINANCE MOYENNE. APPLICATION A LA MISE AU POINT SUR UNE CAMERA.THE INVENTION RELATES TO A FOCUS DETECTION DEVICE FOR A CAMERA. THIS DEVICE INCLUDES A PHOTO-ELECTRIC ELEMENT OF THE SELF-SCANNING TYPE 8, A SCANNING CIRCUIT 13 TO PRODUCE A CONSTANT SIGNAL OF THE IMAGE OF AN OBJECT 6, A PHOTO-ELECTRIC ELEMENT 9 DETERMINING THE AVERAGE LUMINANCE OF THE OBJECT 6, A CLOCK PULSE GENERATOR 12 INTENDED TO CONTROL THE SELF-SCANNING PHOTO-ELECTRIC ELEMENT 8, AN OPTICAL SYSTEM 7 DESIGNED TO FORM THE IMAGE OF OBJECT 6 ON THE PHOTO ELEMENT -ELECTRIC 9 DETERMINING AVERAGE LUMINANCE. APPLICATION TO FOCUS ON A CAMERA.

FR8002789A 1979-02-09 1980-02-08 FOCUSING DETECTION DEVICE FOR A CAMERA Granted FR2448732A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1404279A JPS55108627A (en) 1979-02-09 1979-02-09 Focus detector of camera
JP1525479A JPS55108628A (en) 1979-02-13 1979-02-13 Focus detector of camera

Publications (2)

Publication Number Publication Date
FR2448732A1 true FR2448732A1 (en) 1980-09-05
FR2448732B1 FR2448732B1 (en) 1984-03-30

Family

ID=26349933

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8002789A Granted FR2448732A1 (en) 1979-02-09 1980-02-08 FOCUSING DETECTION DEVICE FOR A CAMERA

Country Status (3)

Country Link
DE (2) DE3004147C2 (en)
FR (1) FR2448732A1 (en)
GB (1) GB2047036B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3049233C2 (en) * 1979-12-27 1988-01-21 Asahi Kogaku Kogyo K.K., Tokyo Photographic camera with automatic focus
DE3131053C2 (en) * 1980-08-07 1983-12-29 Asahi Kogaku Kogyo K.K., Tokyo Automatic focusing detection device for a camera
US4384210A (en) * 1981-02-06 1983-05-17 Honeywell Inc. Spatial low pass filter for range finding systems
JPS5882211A (en) * 1981-11-12 1983-05-17 Asahi Optical Co Ltd Auto-focusing device
US4804831A (en) * 1985-10-30 1989-02-14 Canon Kabushiki Kaisha Focus detecting apparatus independent of object image contrast
GB2209446B (en) * 1987-09-02 1992-09-30 Canon Kk Automatic focusing device
DE3844873C2 (en) * 1987-09-02 1995-03-09 Canon Kk Imaging device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2408746A1 (en) * 1973-02-26 1974-09-05 Minolta Camera Kk DEVICE AND METHOD FOR AUTOMATIC FOCUSING
GB2021894A (en) * 1978-05-18 1979-12-05 Siemens Ag Monocular range-finders

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1173327B (en) * 1961-04-10 1964-07-02 Logetronics Inc Arrangement for detecting and automatically adjusting the focus in a photographic device
DE2406045C2 (en) * 1974-02-08 1983-03-17 Canon Inc., Tokyo Arrangement consisting of at least two photoelectric conversion elements
JPS5315131A (en) * 1976-07-27 1978-02-10 Canon Inc Detecting method for sharpness of objective image

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2408746A1 (en) * 1973-02-26 1974-09-05 Minolta Camera Kk DEVICE AND METHOD FOR AUTOMATIC FOCUSING
GB2021894A (en) * 1978-05-18 1979-12-05 Siemens Ag Monocular range-finders

Also Published As

Publication number Publication date
DE3050691C2 (en) 1984-09-27
DE3004147A1 (en) 1980-08-14
GB2047036A (en) 1980-11-19
GB2047036B (en) 1983-02-16
FR2448732B1 (en) 1984-03-30
DE3004147C2 (en) 1983-06-23

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Legal Events

Date Code Title Description
DL Decision of the director general to leave to make available licences of right
ST Notification of lapse