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JPS56151916A - Photographic system in which aperture is controlled by preliminary flash emission - Google Patents

Photographic system in which aperture is controlled by preliminary flash emission

Info

Publication number
JPS56151916A
JPS56151916A JP5574180A JP5574180A JPS56151916A JP S56151916 A JPS56151916 A JP S56151916A JP 5574180 A JP5574180 A JP 5574180A JP 5574180 A JP5574180 A JP 5574180A JP S56151916 A JPS56151916 A JP S56151916A
Authority
JP
Japan
Prior art keywords
emission
aperture
discharge tube
flash
signal
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
JP5574180A
Other languages
Japanese (ja)
Inventor
Tokuji Ishida
Hiroshi Hosomizu
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP5574180A priority Critical patent/JPS56151916A/en
Priority to US06/257,238 priority patent/US4367023A/en
Publication of JPS56151916A publication Critical patent/JPS56151916A/en
Priority to US06/428,581 priority patent/US4458995A/en
Priority to US06/580,351 priority patent/US4542975A/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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To prevent the wasteful consumption of electric energy by causing preliminary emission of a flash discharge tube, measuring the light from an object illuminated by this emission through a photographic lens aperture and stopping the emission of the flash discharge tube upon determination of the aperture. CONSTITUTION:A signal commanding preliminary emission is sent from a camera to a flash device, and when the photometric value outputted by the photometric circuit in a control signal generating circuit 1 incorporated in the camera attains the prescribed relation with respect to a value given beforehand, the signal for detaining the stopping-down movement of the aperture via an aperture diameter control circuit 4 is emitted, and with this signal as a preliminary emission stop signal, it is sent to the flash device through the flash control circuit 8 of the camera. with such constitution, the sustained emission of the flash discharge tube is stopped upon determination of the aperture and therefore the wasteful consumption of electric energy by the subsequent wasteful emission of the discharge tube is prevented.
JP5574180A 1980-04-25 1980-04-25 Photographic system in which aperture is controlled by preliminary flash emission Pending JPS56151916A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5574180A JPS56151916A (en) 1980-04-25 1980-04-25 Photographic system in which aperture is controlled by preliminary flash emission
US06/257,238 US4367023A (en) 1980-04-25 1981-04-24 Camera flash light control circuitry
US06/428,581 US4458995A (en) 1980-04-25 1982-09-30 Camera flash light control circuitry
US06/580,351 US4542975A (en) 1980-04-25 1984-02-15 Camera flash light control circuitry

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5574180A JPS56151916A (en) 1980-04-25 1980-04-25 Photographic system in which aperture is controlled by preliminary flash emission

Publications (1)

Publication Number Publication Date
JPS56151916A true JPS56151916A (en) 1981-11-25

Family

ID=13007276

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5574180A Pending JPS56151916A (en) 1980-04-25 1980-04-25 Photographic system in which aperture is controlled by preliminary flash emission

Country Status (1)

Country Link
JP (1) JPS56151916A (en)

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