JPS56125713A - Sharpness detector of image - Google Patents

Sharpness detector of image

Info

Publication number
JPS56125713A
JPS56125713A JP2873580A JP2873580A JPS56125713A JP S56125713 A JPS56125713 A JP S56125713A JP 2873580 A JP2873580 A JP 2873580A JP 2873580 A JP2873580 A JP 2873580A JP S56125713 A JPS56125713 A JP S56125713A
Authority
JP
Japan
Prior art keywords
circuit
signal
integration
led8
image forming
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
JP2873580A
Other languages
Japanese (ja)
Other versions
JPS6251442B2 (en
Inventor
Yukichi Niwa
Yasuo Ogino
Mitsutoshi Owada
Kazuo Tanaka
Noboru Yukimura
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP2873580A priority Critical patent/JPS56125713A/en
Priority to US06/190,454 priority patent/US4384199A/en
Priority to DE19803036343 priority patent/DE3036343A1/en
Publication of JPS56125713A publication Critical patent/JPS56125713A/en
Publication of JPS6251442B2 publication Critical patent/JPS6251442B2/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
    • G02B7/30—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)
  • Automatic Focus Adjustment (AREA)
  • Measurement Of Optical Distance (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To efficiently reject external optical signal, by locating the light source and self-scanning type photodetector at the location conjugate with the scheduled image forming plane of a image forming optical system and taking the sum of the one-period unit of integration of opposite polarity of the photodetector signal every semiperiod of flickered optics. CONSTITUTION:LED8 and CCD9 are located at the location conjugate with the scheduled image forming plane 10 of the lens 7, the object is irradiated via the mirror 11 and lens 7, and the reflected light is imaged on CCD. LED8 is flickered with the pulse of the driving circuit 22 via the signal from the sequence controlling circuit 21. The output of CCD9 passes through the offset controlling circit 13, sample holding circuit 14, amplifier 15, DC component reproducing circuit 16, and integration polarity inverting circuit 17, and the sum in one-period unit of integration of opposite polarity every semiperiod of flockering of LED8 is taken at the integration circuit 18 via the signal of the control circuit 21, and it is compared with the set level Vrf via the sample holding circuit 19 and window comparators 23, 23', and LEDs 25, 25' are lighted in focusing. Thus, external light signal can efficiently be rejected.
JP2873580A 1979-09-27 1980-03-07 Sharpness detector of image Granted JPS56125713A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2873580A JPS56125713A (en) 1980-03-07 1980-03-07 Sharpness detector of image
US06/190,454 US4384199A (en) 1979-09-27 1980-09-24 Incident position detector for radiation beam
DE19803036343 DE3036343A1 (en) 1979-09-27 1980-09-26 DETECTOR DEVICE FOR DETECTING RADIATION BANDS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2873580A JPS56125713A (en) 1980-03-07 1980-03-07 Sharpness detector of image

Publications (2)

Publication Number Publication Date
JPS56125713A true JPS56125713A (en) 1981-10-02
JPS6251442B2 JPS6251442B2 (en) 1987-10-30

Family

ID=12256680

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2873580A Granted JPS56125713A (en) 1979-09-27 1980-03-07 Sharpness detector of image

Country Status (1)

Country Link
JP (1) JPS56125713A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5927535U (en) * 1982-06-30 1984-02-21 イ−ストマン　コダック　カンパニ− range finder
JPS59157604A (en) * 1983-02-28 1984-09-07 Nippon Seimitsu Kogyo Kk Optical equipment equipped with focus controller
JPS60214321A (en) * 1984-04-11 1985-10-26 Kowa Co Automatic focus adjusting device
JPS6291616U (en) * 1985-11-27 1987-06-11
US4711999A (en) * 1982-06-05 1987-12-08 Olympus Optical Co., Ltd. Apparatus for photometrically detecting an optically focused condition of an optical system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711999A (en) * 1982-06-05 1987-12-08 Olympus Optical Co., Ltd. Apparatus for photometrically detecting an optically focused condition of an optical system
US4737622A (en) * 1982-06-05 1988-04-12 Olympus Optical Co., Ltd. Apparatus for photometrically detecting an optically focused condition of an optical system
JPS5927535U (en) * 1982-06-30 1984-02-21 イ−ストマン　コダック　カンパニ− range finder
JPH0435866Y2 (en) * 1982-06-30 1992-08-25
JPS59157604A (en) * 1983-02-28 1984-09-07 Nippon Seimitsu Kogyo Kk Optical equipment equipped with focus controller
JPS60214321A (en) * 1984-04-11 1985-10-26 Kowa Co Automatic focus adjusting device
JPH045361B2 (en) * 1984-04-11 1992-01-31
JPS6291616U (en) * 1985-11-27 1987-06-11
JPH04331Y2 (en) * 1985-11-27 1992-01-08

Also Published As

Publication number Publication date
JPS6251442B2 (en) 1987-10-30

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