JPS57161710A - Focusing detecting method - Google Patents

Focusing detecting method

Info

Publication number
JPS57161710A
JPS57161710A JP4608981A JP4608981A JPS57161710A JP S57161710 A JPS57161710 A JP S57161710A JP 4608981 A JP4608981 A JP 4608981A JP 4608981 A JP4608981 A JP 4608981A JP S57161710 A JPS57161710 A JP S57161710A
Authority
JP
Japan
Prior art keywords
time
reference level
photoelectric
integral
output
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
JP4608981A
Other languages
Japanese (ja)
Other versions
JPS6412366B2 (en
Inventor
Asao Hayashi
Kenichi Oikami
Masatoshi Ida
Masahiro Aoki
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP4608981A priority Critical patent/JPS57161710A/en
Publication of JPS57161710A publication Critical patent/JPS57161710A/en
Publication of JPS6412366B2 publication Critical patent/JPS6412366B2/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 achieve focusing detection accurately all the time by detecting the integral time of a photodetection output and then controlling the reference level of a photodetecting element by comparing the integral time with a predetermined value. CONSTITUTION:The photoelectric converting circuits 17A-1-17A-n, and 17B-1- 17B-n of photodetectors 3A and 3B input a charge signal from a CPU5 to control the integration of a photoelectric output, and respective pieces of integral picture-element information are supplied to sample holding circuits 18A-1-18A- n, and 18B-1-18B-n selectivey in parallel and then supplied to the comparators 19-1-19-n of a signal processing circuit 4. For the purpose, an elapsed time from the start of the integration of the photoelectric output until the photoelectric output of at least one photodetecting element reaches a prescribed reference level is detected, and when this elapsed time is longer than a predetermined time, the reference level is lowered to obtain a focusing detection signal.
JP4608981A 1981-03-28 1981-03-28 Focusing detecting method Granted JPS57161710A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4608981A JPS57161710A (en) 1981-03-28 1981-03-28 Focusing detecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4608981A JPS57161710A (en) 1981-03-28 1981-03-28 Focusing detecting method

Publications (2)

Publication Number Publication Date
JPS57161710A true JPS57161710A (en) 1982-10-05
JPS6412366B2 JPS6412366B2 (en) 1989-02-28

Family

ID=12737253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4608981A Granted JPS57161710A (en) 1981-03-28 1981-03-28 Focusing detecting method

Country Status (1)

Country Link
JP (1) JPS57161710A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02230645A (en) * 1989-03-02 1990-09-13 Nissin Electric Co Ltd Evaporation source
JP3880111B2 (en) 1996-11-28 2007-02-14 四国化工機株式会社 Cutting device for filling and packaging machine

Also Published As

Publication number Publication date
JPS6412366B2 (en) 1989-02-28

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