JPS56168639A - Flash photographing device - Google Patents

Flash photographing device

Info

Publication number
JPS56168639A
JPS56168639A JP5366181A JP5366181A JPS56168639A JP S56168639 A JPS56168639 A JP S56168639A JP 5366181 A JP5366181 A JP 5366181A JP 5366181 A JP5366181 A JP 5366181A JP S56168639 A JPS56168639 A JP S56168639A
Authority
JP
Japan
Prior art keywords
flash
time
operated
circuit
subject
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
JP5366181A
Other languages
Japanese (ja)
Inventor
Tadashi Ito
Nobuhiko Shinoda
Fumio Ito
Soichi Nakamoto
Nobuaki Sakurada
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 JP5366181A priority Critical patent/JPS56168639A/en
Publication of JPS56168639A publication Critical patent/JPS56168639A/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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera

Abstract

PURPOSE:To improve operativity and reduce the influence of ambient light by so constituting the device that photometry for the purpose of determining aperture value is carried out only within a short time of the flash sustaining time of the 1st flash emission. CONSTITUTION:When the release button of a camera is pushed at the time of the flash photographing, the synchronising switch of an operation discriminating setting circuit 3 is closed, and a discharge tube emits light, by which a subject is lighted. The reflected light of this subject is converted to the quantity of electricity through a photodetector P, and is integrated by way of a capacitor C and an operational amplifier OP. On the other hand, an integrated value read circuit 17 reads the output of a photometric circuit 1 during the prescribed short time within the flash time of the 1st emission. The output of said read circuit 17 is stored in a data storage device 10, thence it is operated with film sensitivity information via an arithmetic circuit 8, by which subject distance information Dv is operated. A diaphragm adjusting device is operated thereby, and a correct aperture value is set. With such constitution, the operativity is improved, and the influence of ambient light is suppressed.
JP5366181A 1981-04-08 1981-04-08 Flash photographing device Pending JPS56168639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5366181A JPS56168639A (en) 1981-04-08 1981-04-08 Flash photographing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5366181A JPS56168639A (en) 1981-04-08 1981-04-08 Flash photographing device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP49039636A Division JPS50133831A (en) 1974-04-08 1974-04-08

Publications (1)

Publication Number Publication Date
JPS56168639A true JPS56168639A (en) 1981-12-24

Family

ID=12949032

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5366181A Pending JPS56168639A (en) 1981-04-08 1981-04-08 Flash photographing device

Country Status (1)

Country Link
JP (1) JPS56168639A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61188524A (en) * 1985-02-18 1986-08-22 West Electric Co Ltd Automatic dimming stroboscope device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61188524A (en) * 1985-02-18 1986-08-22 West Electric Co Ltd Automatic dimming stroboscope device

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