JPS57198416A - Automatic focus detector - Google Patents

Automatic focus detector

Info

Publication number
JPS57198416A
JPS57198416A JP8335581A JP8335581A JPS57198416A JP S57198416 A JPS57198416 A JP S57198416A JP 8335581 A JP8335581 A JP 8335581A JP 8335581 A JP8335581 A JP 8335581A JP S57198416 A JPS57198416 A JP S57198416A
Authority
JP
Japan
Prior art keywords
element group
find
outputs
photoelectric element
alpha
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
JP8335581A
Other languages
Japanese (ja)
Other versions
JPS6357764B2 (en
Inventor
Ikue Kawashima
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.)
Tohoku Ricoh Co Ltd
Original Assignee
Tohoku Ricoh 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
Application filed by Tohoku Ricoh Co Ltd filed Critical Tohoku Ricoh Co Ltd
Priority to JP8335581A priority Critical patent/JPS57198416A/en
Publication of JPS57198416A publication Critical patent/JPS57198416A/en
Publication of JPS6357764B2 publication Critical patent/JPS6357764B2/ja
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)
  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To precisely perform fine positioning by arraying the 1st-3rd photoelectric groups on an optical path at an equal interval and setting the stopping value of luminous flux corresponding to the 2nd photoelectric element group so as to differ from that corresponding to the 3rd photoelectric element group. CONSTITUTION:Photoelectrically converted output signals of a1, a2...an bits constituting the 1st photoelectric element group 1 are applied to multiplexer circuits 11 through respective logarithmic amplifiers 10. Outputs from the multiplexers 11 are applied to an alpha differential amplifier 12A and a beta differential amplifier 12B to find light ratio between adjacent bits and then the amplified outputs are applied to integral networks 14 through absolute value circuits 13 to find the sum of values. Outputs from the integral networks are applied to a differential amplifying circuit 15 to find the difference between the alpha and beta signals and the differential signal N is obtained from an output terminal 16.
JP8335581A 1981-05-31 1981-05-31 Automatic focus detector Granted JPS57198416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8335581A JPS57198416A (en) 1981-05-31 1981-05-31 Automatic focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8335581A JPS57198416A (en) 1981-05-31 1981-05-31 Automatic focus detector

Publications (2)

Publication Number Publication Date
JPS57198416A true JPS57198416A (en) 1982-12-06
JPS6357764B2 JPS6357764B2 (en) 1988-11-14

Family

ID=13800123

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8335581A Granted JPS57198416A (en) 1981-05-31 1981-05-31 Automatic focus detector

Country Status (1)

Country Link
JP (1) JPS57198416A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3340575A1 (en) * 1982-11-11 1984-05-17 Sharp K.K., Osaka ELASTIC PUSH BUTTON

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3340575A1 (en) * 1982-11-11 1984-05-17 Sharp K.K., Osaka ELASTIC PUSH BUTTON

Also Published As

Publication number Publication date
JPS6357764B2 (en) 1988-11-14

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