JPS56153325A - Automatic focus controller of camera - Google Patents

Automatic focus controller of camera

Info

Publication number
JPS56153325A
JPS56153325A JP5694980A JP5694980A JPS56153325A JP S56153325 A JPS56153325 A JP S56153325A JP 5694980 A JP5694980 A JP 5694980A JP 5694980 A JP5694980 A JP 5694980A JP S56153325 A JPS56153325 A JP S56153325A
Authority
JP
Japan
Prior art keywords
stationary
spots
light
parts
light emitting
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
JP5694980A
Other languages
Japanese (ja)
Inventor
Takaharu Sugishita
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.)
OSAWA SEIMITSU KOGYO KK
Original Assignee
OSAWA SEIMITSU 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
Application filed by OSAWA SEIMITSU KOGYO KK filed Critical OSAWA SEIMITSU KOGYO KK
Priority to JP5694980A priority Critical patent/JPS56153325A/en
Publication of JPS56153325A publication Critical patent/JPS56153325A/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
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter

Landscapes

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

Abstract

PURPOSE:To compensate contrast within spots by placing the center of the intensity of the beam spots reflecting from an object onto the optical axis of the stationary photodetecting part disposed near light emitting parts for beam spot irradiation by controlling said light emitting parts. CONSTITUTION:Spots are irradiated from stationary light emitting parts 11, 12 to parts on an object 14 having a difference in contrast, and the reflected beams of the light thereof are received by a stationary photodetecting part 10. A pair of photodetectors are provided in the stationary photodetecting part, and the differential signal of both photodetectors is inputted to a control device 17 which in turn increases or decreases the quantities of light of the parts 11, 12 when the quantity of the light spot irradiated from the part 11 and reflected from the object is smaller than that of the part 12. Thereby, the optical axis of a movable photodetecting part 13 correctly detects the center of the spots, whereby the accurate focusing operation is accomplished.
JP5694980A 1980-04-28 1980-04-28 Automatic focus controller of camera Pending JPS56153325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5694980A JPS56153325A (en) 1980-04-28 1980-04-28 Automatic focus controller of camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5694980A JPS56153325A (en) 1980-04-28 1980-04-28 Automatic focus controller of camera

Publications (1)

Publication Number Publication Date
JPS56153325A true JPS56153325A (en) 1981-11-27

Family

ID=13041796

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5694980A Pending JPS56153325A (en) 1980-04-28 1980-04-28 Automatic focus controller of camera

Country Status (1)

Country Link
JP (1) JPS56153325A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61292609A (en) * 1985-06-21 1986-12-23 Canon Inc Automatic focus detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61292609A (en) * 1985-06-21 1986-12-23 Canon Inc Automatic focus detector

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