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JPS56162707A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS56162707A
JPS56162707A JP5433581A JP5433581A JPS56162707A JP S56162707 A JPS56162707 A JP S56162707A JP 5433581 A JP5433581 A JP 5433581A JP 5433581 A JP5433581 A JP 5433581A JP S56162707 A JPS56162707 A JP S56162707A
Authority
JP
Japan
Prior art keywords
luminous fluxes
automatic focusing
focusing device
lens
past
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
JP5433581A
Other languages
Japanese (ja)
Inventor
Mitsuo Eguchi
Masahito Yoshida
Yoshiji Kato
Nobuyuki Ichino
Yoshimi Kikuchi
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.)
Mamiya Camera Co Ltd
Original Assignee
Mamiya Camera 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 Mamiya Camera Co Ltd filed Critical Mamiya Camera Co Ltd
Priority to JP5433581A priority Critical patent/JPS56162707A/en
Publication of JPS56162707A publication Critical patent/JPS56162707A/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
    • G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane

Landscapes

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

Abstract

PURPOSE:To obtain an ideal automatic focusing device by a TTL system by measuring the correlative relation of the intensity distributions of a subject by the luminous fluxes past the different parts of a photographic optical system. CONSTITUTION:The light past the points A and B of a photographic lens 1 from the object is reflected by a half mirror 4, is split by a blade 2 reciprocatively moved in arrow directions driven by a blade driving device 5 and enters a CCD 3 in the position conjugate with a film F driven by a sensor driver 6. The time series signal Sv indicating the intensity distribution in the (y) direction of the object is converted to binary coded signals DA, DB for luminous fluxes A and B by a binary coder 7, the data whereof are stored in memories 8A, 8B. The correlations of the data are determined by a correlator 9, the image distance delta between the luminous fluxes A and B is applied to an operator 10, the movement extent DELTAV of the photographic lens inputs to a differential amplifier 11, and the position of the lens 1 is adjusted by the differential output between the same and the position signal Vx from a position sensor 12. Thereby, the ideal automatic focusing device by a TTL system is obtained.
JP5433581A 1981-04-13 1981-04-13 Automatic focusing device Pending JPS56162707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5433581A JPS56162707A (en) 1981-04-13 1981-04-13 Automatic focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5433581A JPS56162707A (en) 1981-04-13 1981-04-13 Automatic focusing device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP323380A Division JPS56101111A (en) 1980-01-14 1980-01-14 Automatic focus adjustment method

Publications (1)

Publication Number Publication Date
JPS56162707A true JPS56162707A (en) 1981-12-14

Family

ID=12967725

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5433581A Pending JPS56162707A (en) 1981-04-13 1981-04-13 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS56162707A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61247157A (en) * 1985-04-25 1986-11-04 Canon Inc Automatic focusing device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120725A (en) * 1975-04-16 1976-10-22 Sankyo Kogaku Kogyo Kk Automatic forcusing camera
JPS54159259A (en) * 1978-06-05 1979-12-15 Honeywell Inc Device for determining distance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120725A (en) * 1975-04-16 1976-10-22 Sankyo Kogaku Kogyo Kk Automatic forcusing camera
JPS54159259A (en) * 1978-06-05 1979-12-15 Honeywell Inc Device for determining distance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61247157A (en) * 1985-04-25 1986-11-04 Canon Inc Automatic focusing device
JPH0785125B2 (en) * 1985-04-25 1995-09-13 キヤノン株式会社 Focus adjustment device

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