JPS5742033A - Automatic dimming flash device for photography - Google Patents

Automatic dimming flash device for photography

Info

Publication number
JPS5742033A
JPS5742033A JP11996280A JP11996280A JPS5742033A JP S5742033 A JPS5742033 A JP S5742033A JP 11996280 A JP11996280 A JP 11996280A JP 11996280 A JP11996280 A JP 11996280A JP S5742033 A JPS5742033 A JP S5742033A
Authority
JP
Japan
Prior art keywords
capacitor
diode
thyristor
resistance
electric charging
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
JP11996280A
Other languages
Japanese (ja)
Inventor
Suzuo Kojima
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11996280A priority Critical patent/JPS5742033A/en
Publication of JPS5742033A publication Critical patent/JPS5742033A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
    • H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation

Landscapes

  • Stroboscope Apparatuses (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

PURPOSE:To reduce electric charging time and improve electric current suppression effect by forming an electric charging circuit for a commutation capacitor of a flash circuit of a transistor, a diode, a resistance, etc. CONSTITUTION:An electric charging circuit 15 for a commutation capacitor 8 is formed of an NPN transistor 16, a diode 17 connected in antiparallel to this, a base resistance 18 of high impedance, etc. As this capacitor 8 discharges, a thyristor 5 is cut off to stop the light emission of a flash tube 3, after which the TR16 is cut off by the reversed polarity bias voltage of the diode 17, and the capacitor 8 is charged to a reversed polarity. Then, the impedance of the TR16 is lowered by the base current through a main capacitor 2, and the capacitor 8 is charged to the prescribed polarity in a short time. In the other hand, the electric current suppression to an auxiliary thyristor 6 is increased by a high impedance resistance 18 and despite the occurrence of a malfunction of the thyristor owing to noise or the like, it resets immediately to a turn off state and the continuous flash photography is accomplished satisfactorily.
JP11996280A 1980-08-28 1980-08-28 Automatic dimming flash device for photography Pending JPS5742033A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11996280A JPS5742033A (en) 1980-08-28 1980-08-28 Automatic dimming flash device for photography

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11996280A JPS5742033A (en) 1980-08-28 1980-08-28 Automatic dimming flash device for photography

Publications (1)

Publication Number Publication Date
JPS5742033A true JPS5742033A (en) 1982-03-09

Family

ID=14774504

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11996280A Pending JPS5742033A (en) 1980-08-28 1980-08-28 Automatic dimming flash device for photography

Country Status (1)

Country Link
JP (1) JPS5742033A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59222821A (en) * 1983-05-31 1984-12-14 Olympus Optical Co Ltd Continuous light emission stroboscope

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59222821A (en) * 1983-05-31 1984-12-14 Olympus Optical Co Ltd Continuous light emission stroboscope
JPH0462367B2 (en) * 1983-05-31 1992-10-06 Olympus Optical Co

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