JPS575016A - Image definition detector - Google Patents

Image definition detector

Info

Publication number
JPS575016A
JPS575016A JP7925680A JP7925680A JPS575016A JP S575016 A JPS575016 A JP S575016A JP 7925680 A JP7925680 A JP 7925680A JP 7925680 A JP7925680 A JP 7925680A JP S575016 A JPS575016 A JP S575016A
Authority
JP
Japan
Prior art keywords
circuit
definition
change
aperture value
lens
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
JP7925680A
Other languages
Japanese (ja)
Other versions
JPS6332171B2 (en
Inventor
Takashi Kawabata
Takao Kinoshita
Nobuhiko Shinoda
Shinji Sakai
Mitsuya Hosoe
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 JP7925680A priority Critical patent/JPS575016A/en
Publication of JPS575016A publication Critical patent/JPS575016A/en
Publication of JPS6332171B2 publication Critical patent/JPS6332171B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Cameras (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To prevent the degradation in the detecting capacity of the change in definition by adjusting the operation characteristics of circuits based on the aperture value (stop value) of a photographic lens by the use of a differentiating circuit for detection of the change in illuminance. CONSTITUTION:The distribution in the illuminances of the image formed by a lens 1 is scanned by a line sensor array 2, and is inputted to a differentiating circuit 4 which is an illuminance change detecting means, via a sample holding circuit 3. The differentiation constant of the circuit 4 is so adjusted that it is smaller, that is, a cutoff frequency is higher, as the aperture value of the lens 1 is larger. The output of the circuit 4 is inputted to a meter 9 via a gain variable amplifier circuit 5, a square circuit 6, an integrating circuit 7 and a sample holding circuit 8, whereby the definition of the image is indicated. In this way, the degradation in the detecting capacity for the change in definition owing to the degration in the image definition with an increase in the aperture value is prevented.
JP7925680A 1980-06-12 1980-06-12 Image definition detector Granted JPS575016A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7925680A JPS575016A (en) 1980-06-12 1980-06-12 Image definition detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7925680A JPS575016A (en) 1980-06-12 1980-06-12 Image definition detector

Publications (2)

Publication Number Publication Date
JPS575016A true JPS575016A (en) 1982-01-11
JPS6332171B2 JPS6332171B2 (en) 1988-06-28

Family

ID=13684765

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7925680A Granted JPS575016A (en) 1980-06-12 1980-06-12 Image definition detector

Country Status (1)

Country Link
JP (1) JPS575016A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5886813A (en) * 1996-09-20 1999-03-23 Olympus Optical Co., Ltd. Autofocus control apparatus and method applied to microscope

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50117419A (en) * 1974-02-08 1975-09-13
JPS5126030A (en) * 1974-08-28 1976-03-03 Minolta Camera Kk GOSHOTENKENSHUTSUSOCHI

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50117419A (en) * 1974-02-08 1975-09-13
JPS5126030A (en) * 1974-08-28 1976-03-03 Minolta Camera Kk GOSHOTENKENSHUTSUSOCHI

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5886813A (en) * 1996-09-20 1999-03-23 Olympus Optical Co., Ltd. Autofocus control apparatus and method applied to microscope

Also Published As

Publication number Publication date
JPS6332171B2 (en) 1988-06-28

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