JPS5741624A - Light-quantity control type flash device - Google Patents

Light-quantity control type flash device

Info

Publication number
JPS5741624A
JPS5741624A JP55117269A JP11726980A JPS5741624A JP S5741624 A JPS5741624 A JP S5741624A JP 55117269 A JP55117269 A JP 55117269A JP 11726980 A JP11726980 A JP 11726980A JP S5741624 A JPS5741624 A JP S5741624A
Authority
JP
Japan
Prior art keywords
light
circuit
emission
trs
stopping circuit
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
JP55117269A
Other languages
Japanese (ja)
Inventor
Yoshiharu Ota
Masayasu Hirano
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 JP55117269A priority Critical patent/JPS5741624A/en
Publication of JPS5741624A publication Critical patent/JPS5741624A/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 power consumption due to the operation of a light-emission stopping circuit when a flash is not made, by putting the light-emission stopping circuit in operation according to the result of AND between a light-emission stop signal from the photometric circuit of a camera and a detection signal indicating that a flash tube is in operation. CONSTITUTION:When a flash tube Xe starts discharging, a voltage is developed across resistance R1 and is applied as a power voltage to a light-emission stopping circuit consisting of transistor TRs 1 and 2. When a level at a terminal STOP changes from low to high in response to a shutter closure signal from the photometric circuit of a camera, the TRs 1 and 2 turn on and an SCR1 also turns on to exercise by-pass control. Even if the shutter closure is generated when the flash tube Xe is not discharging, not electric power is supplied to the light-emission stopping circuit, so the TRs 1 and 2 stay off and the SCR1 is still off.
JP55117269A 1980-08-25 1980-08-25 Light-quantity control type flash device Pending JPS5741624A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55117269A JPS5741624A (en) 1980-08-25 1980-08-25 Light-quantity control type flash device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55117269A JPS5741624A (en) 1980-08-25 1980-08-25 Light-quantity control type flash device

Publications (1)

Publication Number Publication Date
JPS5741624A true JPS5741624A (en) 1982-03-08

Family

ID=14707568

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55117269A Pending JPS5741624A (en) 1980-08-25 1980-08-25 Light-quantity control type flash device

Country Status (1)

Country Link
JP (1) JPS5741624A (en)

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