JPS56130725A - Optical device for focus detection - Google Patents

Optical device for focus detection

Info

Publication number
JPS56130725A
JPS56130725A JP3338380A JP3338380A JPS56130725A JP S56130725 A JPS56130725 A JP S56130725A JP 3338380 A JP3338380 A JP 3338380A JP 3338380 A JP3338380 A JP 3338380A JP S56130725 A JPS56130725 A JP S56130725A
Authority
JP
Japan
Prior art keywords
lenses
image
couple
objective lens
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.)
Pending
Application number
JP3338380A
Other languages
Japanese (ja)
Inventor
Toru Fukuhara
Takeshi Utagawa
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.)
Nikon Corp
Nippon Chemical Industrial Co Ltd
Original Assignee
Nippon Chemical Industrial Co Ltd
Nippon Kogaku 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
Application filed by Nippon Chemical Industrial Co Ltd, Nippon Kogaku KK filed Critical Nippon Chemical Industrial Co Ltd
Priority to JP3338380A priority Critical patent/JPS56130725A/en
Priority to US06/242,886 priority patent/US4370551A/en
Priority to DE19813110296 priority patent/DE3110296A1/en
Publication of JPS56130725A publication Critical patent/JPS56130725A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To improve detection precision and to detect the focusing of even an object with low brightness by making the F number in the 1st plane, containing two optical axes of a couple of image reforming lenses, greater than that in the 2nd plane perpendicular to the 1st one. CONSTITUTION:Light image-formed through objective lens L is led to a couple of image reforming lenses L'' to form the 1st and 2nd images and from position shifts of the 1st and 2nd images on a couple of photoelectric converters P for image position detection arranged near focus surfaces of the image reforming lenses L'', the focusing state of objective lens L is detected. Lenses L'' have the small F number longitudinally, but have the large F number laterally because both their ends are cut, so setting angle (theta) great results in that light beams l1 incident to the edge parts of lenses L'' are ones emitted from the projected pupil of photographing objective lens L, so that the precision of the detection of focusing and defocusing is improved.
JP3338380A 1980-03-18 1980-03-18 Optical device for focus detection Pending JPS56130725A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP3338380A JPS56130725A (en) 1980-03-18 1980-03-18 Optical device for focus detection
US06/242,886 US4370551A (en) 1980-03-18 1981-03-12 Focus detecting device
DE19813110296 DE3110296A1 (en) 1980-03-18 1981-03-17 "FOCUS DETECTOR"

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3338380A JPS56130725A (en) 1980-03-18 1980-03-18 Optical device for focus detection

Publications (1)

Publication Number Publication Date
JPS56130725A true JPS56130725A (en) 1981-10-13

Family

ID=12385063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3338380A Pending JPS56130725A (en) 1980-03-18 1980-03-18 Optical device for focus detection

Country Status (1)

Country Link
JP (1) JPS56130725A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5888709A (en) * 1981-11-24 1983-05-26 Canon Inc Optical system for focusing detection
US4794416A (en) * 1985-08-14 1988-12-27 Minolta Camera Kabushiki Kaisha Focus detection apparatus
US4916473A (en) * 1985-08-14 1990-04-10 Minolta Camera Kabushiki Kaisha Focus detection apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5096223A (en) * 1973-12-19 1975-07-31
JPS52147430A (en) * 1976-06-01 1977-12-07 Konishiroku Photo Ind Co Ltd Focus detection device
JPS55130506A (en) * 1979-03-26 1980-10-09 Honeywell Inc Optical device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5096223A (en) * 1973-12-19 1975-07-31
JPS52147430A (en) * 1976-06-01 1977-12-07 Konishiroku Photo Ind Co Ltd Focus detection device
JPS55130506A (en) * 1979-03-26 1980-10-09 Honeywell Inc Optical device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5888709A (en) * 1981-11-24 1983-05-26 Canon Inc Optical system for focusing detection
US4794416A (en) * 1985-08-14 1988-12-27 Minolta Camera Kabushiki Kaisha Focus detection apparatus
US4916473A (en) * 1985-08-14 1990-04-10 Minolta Camera Kabushiki Kaisha Focus detection apparatus

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