JPS5535317A - Focus detector of camera - Google Patents

Focus detector of camera

Info

Publication number
JPS5535317A
JPS5535317A JP10735478A JP10735478A JPS5535317A JP S5535317 A JPS5535317 A JP S5535317A JP 10735478 A JP10735478 A JP 10735478A JP 10735478 A JP10735478 A JP 10735478A JP S5535317 A JPS5535317 A JP S5535317A
Authority
JP
Japan
Prior art keywords
circuit
photoelectric elements
sample holding
numberth
outputs
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
JP10735478A
Other languages
Japanese (ja)
Inventor
Harumi Aoki
Yoshio Sawada
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP10735478A priority Critical patent/JPS5535317A/en
Priority to GB7927958A priority patent/GB2030415B/en
Priority to FR7921448A priority patent/FR2435054A1/en
Priority to DE19792935303 priority patent/DE2935303C2/en
Publication of JPS5535317A publication Critical patent/JPS5535317A/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)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE: To obtain contrast signal readily with a simple circuit constitution without using any differentiating circuit by holding the outputs of the odd- and even-numberth micro photoelectric elements respectively by the first, second sample holding circuits.
CONSTITUTION: The outputs from the self-scanning type photoelectric element 15 consisting of a plurality of micro photoelectric elements and scanning circuit placed in the positions equivalent to the photographing plane of lens are inputted to two sample holding circuits 18, 19 which convert these to analog waveforms. The differences of both outputs are detected with a differential circuit 20. The absolute value thereof is detected with an absolute value detecting circuit 21 and is inputted to a peak value holding circuit 22 which holds the peak value of the absolute value waveform during one scanning of the photoelectric elements. At this time, arrangement is so made that the output of the odd-numberth micro photoelectric elements are held by the first sample holding circuit 18 and the even-numberth ones are held by the second sample holding circuit 19, whereby the output differences between the adjoining micro photoelectric elements are detected and the maximum peak value output is emitted at the focusing.
COPYRIGHT: (C)1980,JPO&Japio
JP10735478A 1978-09-01 1978-09-01 Focus detector of camera Pending JPS5535317A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP10735478A JPS5535317A (en) 1978-09-01 1978-09-01 Focus detector of camera
GB7927958A GB2030415B (en) 1978-09-01 1979-08-10 Focus detection device
FR7921448A FR2435054A1 (en) 1978-09-01 1979-08-27 FOCUS DETECTION DEVICE FOR PHOTOGRAPHIC APPARATUS
DE19792935303 DE2935303C2 (en) 1978-09-01 1979-08-31 Device for determining the focus of a lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10735478A JPS5535317A (en) 1978-09-01 1978-09-01 Focus detector of camera

Publications (1)

Publication Number Publication Date
JPS5535317A true JPS5535317A (en) 1980-03-12

Family

ID=14456927

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10735478A Pending JPS5535317A (en) 1978-09-01 1978-09-01 Focus detector of camera

Country Status (4)

Country Link
JP (1) JPS5535317A (en)
DE (1) DE2935303C2 (en)
FR (1) FR2435054A1 (en)
GB (1) GB2030415B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5759107A (en) * 1980-09-26 1982-04-09 Hitachi Ltd Method and device for measuring plate thickness
GB2195214B (en) * 1980-12-10 1988-10-26 Emi Ltd Automatic focussing system for an optical system
JPS58189606A (en) * 1982-04-30 1983-11-05 Fuji Electric Co Ltd Automatic focus adjusting device of optical instrument

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906219A (en) * 1973-10-09 1975-09-16 Honeywell Inc Focus detecting apparatus
FR2338504A1 (en) * 1976-01-15 1977-08-12 Leitz Ernst Gmbh Auto focus with spatial filtering - has pairwise interrogation of photoelectric diodes and concentrator for optical fluxes
US4132888A (en) * 1976-03-17 1979-01-02 Toshihiro Kondo Device for automatically focusing image
JPS5529878A (en) * 1978-08-24 1980-03-03 Asahi Optical Co Ltd Focus detector of camera

Also Published As

Publication number Publication date
GB2030415A (en) 1980-04-02
DE2935303C2 (en) 1982-05-19
GB2030415B (en) 1983-03-09
FR2435054A1 (en) 1980-03-28
FR2435054B1 (en) 1983-03-04
DE2935303A1 (en) 1980-03-13

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