JPS5677830A - Controller for quantity of emitted light of flash unit - Google Patents

Controller for quantity of emitted light of flash unit

Info

Publication number
JPS5677830A
JPS5677830A JP15500579A JP15500579A JPS5677830A JP S5677830 A JPS5677830 A JP S5677830A JP 15500579 A JP15500579 A JP 15500579A JP 15500579 A JP15500579 A JP 15500579A JP S5677830 A JPS5677830 A JP S5677830A
Authority
JP
Japan
Prior art keywords
transistor
closed
capacitor
oscillation
flows
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
JP15500579A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Takematsu
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.)
Fuji Koeki Corp
Original Assignee
Fuji Koeki 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 Fuji Koeki Corp filed Critical Fuji Koeki Corp
Priority to JP15500579A priority Critical patent/JPS5677830A/en
Priority to DE3041590A priority patent/DE3041590C2/en
Priority to IT50088/80A priority patent/IT1127923B/en
Priority to NL8006077A priority patent/NL8006077A/en
Priority to GB8035750A priority patent/GB2065904B/en
Priority to FR8023752A priority patent/FR2469857A1/en
Priority to US06/204,797 priority patent/US4382211A/en
Publication of JPS5677830A publication Critical patent/JPS5677830A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To enable proper exposure control through stable measurement by applying a stable voltage to a measuring circuit while stopping the oscillation of a light emitting circuit during flashing. CONSTITUTION:As transistor 12 conducts through a feedback winding 11b of the oscillating transformer, electric currenet flows through winding 11a to charge main capacitor 17 via diode 14 and when synchro contact 23 coupling with the shutter is closed, discharge tube 24 flashes. With this contact 23 closed, the charge of capacitor 16 flows through protective resistance 15, etc., to turn on transistor 6, and consequently the closed circuit of transistor 6, diode 5, the base electrode of transistor 12, resistance 8, capacitor 7, etc., is formed to stop the oscillation of transformer 11, so that a stable voltage will be applied to phototransistor 9. Therefore, exposure in flash photography is controlled properly by dimming operation according to stable measurement.
JP15500579A 1979-11-07 1979-11-30 Controller for quantity of emitted light of flash unit Pending JPS5677830A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP15500579A JPS5677830A (en) 1979-11-30 1979-11-30 Controller for quantity of emitted light of flash unit
DE3041590A DE3041590C2 (en) 1979-11-07 1980-11-04 Circuit arrangement for an electric flash device
IT50088/80A IT1127923B (en) 1979-11-07 1980-11-05 IMPROVEMENT IN ELECTRIC FLASHERS
NL8006077A NL8006077A (en) 1979-11-07 1980-11-06 ELECTRIC FLASHING DEVICE.
GB8035750A GB2065904B (en) 1979-11-07 1980-11-06 Electronic flash device
FR8023752A FR2469857A1 (en) 1979-11-07 1980-11-06 ELECTRIC DEVICE PRODUCING LIGHT FLASHES
US06/204,797 US4382211A (en) 1979-11-07 1980-11-07 Electric flash device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15500579A JPS5677830A (en) 1979-11-30 1979-11-30 Controller for quantity of emitted light of flash unit

Publications (1)

Publication Number Publication Date
JPS5677830A true JPS5677830A (en) 1981-06-26

Family

ID=15596604

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15500579A Pending JPS5677830A (en) 1979-11-07 1979-11-30 Controller for quantity of emitted light of flash unit

Country Status (1)

Country Link
JP (1) JPS5677830A (en)

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