GB2047036B - Focus detection device - Google Patents

Focus detection device

Info

Publication number
GB2047036B
GB2047036B GB8004233A GB8004233A GB2047036B GB 2047036 B GB2047036 B GB 2047036B GB 8004233 A GB8004233 A GB 8004233A GB 8004233 A GB8004233 A GB 8004233A GB 2047036 B GB2047036 B GB 2047036B
Authority
GB
United Kingdom
Prior art keywords
detection device
focus detection
focus
detection
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
Application number
GB8004233A
Other versions
GB2047036A (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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 JP1404279A external-priority patent/JPS55108627A/en
Priority claimed from JP1525479A external-priority patent/JPS55108628A/en
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB2047036A publication Critical patent/GB2047036A/en
Application granted granted Critical
Publication of GB2047036B publication Critical patent/GB2047036B/en
Expired 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
GB8004233A 1979-02-09 1980-02-08 Focus detection device Expired GB2047036B (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
GB2047036A GB2047036A (en) 1980-11-19
GB2047036B true GB2047036B (en) 1983-02-16

Family

ID=26349933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8004233A Expired GB2047036B (en) 1979-02-09 1980-02-08 Focus detection device

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

Family Cites Families (5)

* 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
US3967056A (en) * 1973-02-26 1976-06-29 Minolta Camera Kabushiki Kaisha Automatic focusing apparatus
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
DE2821722C2 (en) * 1978-05-18 1981-09-17 Siemens AG, 1000 Berlin und 8000 München Device for automatic or semi-automatic focusing of the image of an object on an image plane

Also Published As

Publication number Publication date
FR2448732B1 (en) 1984-03-30
GB2047036A (en) 1980-11-19
DE3004147C2 (en) 1983-06-23
DE3004147A1 (en) 1980-08-14
DE3050691C2 (en) 1984-09-27
FR2448732A1 (en) 1980-09-05

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Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930208