JPS56144419A - Detecting method - Google Patents

Detecting method

Info

Publication number
JPS56144419A
JPS56144419A JP4888180A JP4888180A JPS56144419A JP S56144419 A JPS56144419 A JP S56144419A JP 4888180 A JP4888180 A JP 4888180A JP 4888180 A JP4888180 A JP 4888180A JP S56144419 A JPS56144419 A JP S56144419A
Authority
JP
Japan
Prior art keywords
signal
light source
solid
state image
image sensing
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
JP4888180A
Other languages
Japanese (ja)
Inventor
Masashi Kantani
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP4888180A priority Critical patent/JPS56144419A/en
Publication of JPS56144419A publication Critical patent/JPS56144419A/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
    • G02B7/30—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

Abstract

PURPOSE:To eliminate the influence of the flicker of a light source and perform focus detection etc. with good accuracy by dividing the fluctuating output signal by the AC signal of matched phases at the time of receiving and detecting the object light lighted by the AC light source with a solid-state image sensing element. CONSTITUTION:The image of an object 1 lighted by a light source 3 which is put on by an AC power source 2 is formed on a solid-state image sensing element 5 by a lens 4, and as the quantity of light of said light source fluctuates, the output of one accumulation time of said element fluctuates. The output fluctuation of said element delays by 1/2 the one accumulation time. Thereupon, the AC signal is delayed by the above-mentioned time by a phase shift circuit 9 and the spurious light source light quantity signal is obtained by a full wave rectifier 10 and a bias-variable amplifying circuit. This signal is made into the waveform similar to that of the output signal of the solid-state image sensing element by a sample holding circuit 13 and is passed through a divider 8, by which the output fluctuation of the solid-state image sensing element is canceled and is inputted to automatic detecting circuit for focus etc.
JP4888180A 1980-04-14 1980-04-14 Detecting method Pending JPS56144419A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4888180A JPS56144419A (en) 1980-04-14 1980-04-14 Detecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4888180A JPS56144419A (en) 1980-04-14 1980-04-14 Detecting method

Publications (1)

Publication Number Publication Date
JPS56144419A true JPS56144419A (en) 1981-11-10

Family

ID=12815618

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4888180A Pending JPS56144419A (en) 1980-04-14 1980-04-14 Detecting method

Country Status (1)

Country Link
JP (1) JPS56144419A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6115877U (en) * 1984-07-03 1986-01-29 京セラ株式会社 Video camera automatic focus adjustment device
JPH05227470A (en) * 1992-02-10 1993-09-03 Nippon Avionics Co Ltd Luminance variation correcting picture processing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6115877U (en) * 1984-07-03 1986-01-29 京セラ株式会社 Video camera automatic focus adjustment device
JPH05227470A (en) * 1992-02-10 1993-09-03 Nippon Avionics Co Ltd Luminance variation correcting picture processing system

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