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JPS56155909A - Focus detector - Google Patents

Focus detector

Info

Publication number
JPS56155909A
JPS56155909A JP4891281A JP4891281A JPS56155909A JP S56155909 A JPS56155909 A JP S56155909A JP 4891281 A JP4891281 A JP 4891281A JP 4891281 A JP4891281 A JP 4891281A JP S56155909 A JPS56155909 A JP S56155909A
Authority
JP
Japan
Prior art keywords
image
scanning
variation
time
signal
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
JP4891281A
Other languages
Japanese (ja)
Inventor
Yukio Mashita
Nobuaki Sakurada
Tadashi Ito
Fumio Ito
Nobuhiko Shinoda
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP4891281A priority Critical patent/JPS56155909A/en
Publication of JPS56155909A publication Critical patent/JPS56155909A/en
Pending 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)
  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To facilitate the miniaturization of a focus detector by eliminating the need for a mechanical scanning mechanism by scanning an image pattern fully electrically. CONSTITUTION:The image sensor means equipped with the photodetection part composed of an array of many small photodetectors P1-Pn and electronic time-series output means 1 and 2 which output output signals of photodetectors P1-Pn in time series responding to an external control signal scans the detected image of an object obtained through image-formation optical system L. A scanning signal obtained at this time is supplied to signal variation detecting circuits 5, 6 and 7 to extract variation in the scanning signal and information on the extracted variation is integrated by integrating circuit 9 to obtain information on the image forming state of the detected image.
JP4891281A 1981-04-01 1981-04-01 Focus detector Pending JPS56155909A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4891281A JPS56155909A (en) 1981-04-01 1981-04-01 Focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4891281A JPS56155909A (en) 1981-04-01 1981-04-01 Focus detector

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP49036790A Division JPS50129220A (en) 1974-04-01 1974-04-01

Publications (1)

Publication Number Publication Date
JPS56155909A true JPS56155909A (en) 1981-12-02

Family

ID=12816462

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4891281A Pending JPS56155909A (en) 1981-04-01 1981-04-01 Focus detector

Country Status (1)

Country Link
JP (1) JPS56155909A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5572011A (en) * 1993-12-28 1996-11-05 Olympus Optical Co., Ltd. Focus detecting method and distance measuring method with a plurality of light fluxes and a contrast operation

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50129220A (en) * 1974-04-01 1975-10-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50129220A (en) * 1974-04-01 1975-10-13

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5572011A (en) * 1993-12-28 1996-11-05 Olympus Optical Co., Ltd. Focus detecting method and distance measuring method with a plurality of light fluxes and a contrast operation

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