JPS5714830A - Automatic exposure control circuit - Google Patents

Automatic exposure control circuit

Info

Publication number
JPS5714830A
JPS5714830A JP8863080A JP8863080A JPS5714830A JP S5714830 A JPS5714830 A JP S5714830A JP 8863080 A JP8863080 A JP 8863080A JP 8863080 A JP8863080 A JP 8863080A JP S5714830 A JPS5714830 A JP S5714830A
Authority
JP
Japan
Prior art keywords
influence
exposure
switches
integrator
setting
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
JP8863080A
Other languages
Japanese (ja)
Inventor
Seiichi Hosoda
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 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 Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP8863080A priority Critical patent/JPS5714830A/en
Publication of JPS5714830A publication Critical patent/JPS5714830A/en
Pending 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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • 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
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units

Abstract

PURPOSE:To prevent the influence of an exposure time setting switch by presetting the charging voltage of an integrated capacitor of a photodetecting signal integrator by way of a presetting circuit to which the source boltages divided by switches are applied. CONSTITUTION:The divided source voltages by exposure constant setting switches 30-34 are applied to a presetting circuit 22, and the charging voltage of the integrating capacitor 4 of an integrator 5 which integrates the photodetecting value of a photodetector 2 is preset. Thereby, the exposure time constant of the integrator 5 is set, and the exposure is automatically controlled accord the setting by a comparator 6 and the like. Since the source voltages are held applied to the exposure time constant switches despite the formation of oxide films by this system of substantially changing the integration time constants by changing the precharging voltage of the integrating capacitor, virtually no influence thereof is received and contact defects do not occur. The voltage dividing circuit can be of a low impendance and therefore there is no influence of leak current, and the automatic exposure control circuit having no influence of the setting switches is obtained.
JP8863080A 1980-06-30 1980-06-30 Automatic exposure control circuit Pending JPS5714830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8863080A JPS5714830A (en) 1980-06-30 1980-06-30 Automatic exposure control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8863080A JPS5714830A (en) 1980-06-30 1980-06-30 Automatic exposure control circuit

Publications (1)

Publication Number Publication Date
JPS5714830A true JPS5714830A (en) 1982-01-26

Family

ID=13948122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8863080A Pending JPS5714830A (en) 1980-06-30 1980-06-30 Automatic exposure control circuit

Country Status (1)

Country Link
JP (1) JPS5714830A (en)

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