JPS5652736A - Flash device - Google Patents

Flash device

Info

Publication number
JPS5652736A
JPS5652736A JP12965079A JP12965079A JPS5652736A JP S5652736 A JPS5652736 A JP S5652736A JP 12965079 A JP12965079 A JP 12965079A JP 12965079 A JP12965079 A JP 12965079A JP S5652736 A JPS5652736 A JP S5652736A
Authority
JP
Japan
Prior art keywords
diode
trq1
series
emitter
capacitor
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
JP12965079A
Other languages
Japanese (ja)
Inventor
Tadashi Okino
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 JP12965079A priority Critical patent/JPS5652736A/en
Priority to US06/193,458 priority patent/US4306281A/en
Priority to DE19803037863 priority patent/DE3037863A1/en
Publication of JPS5652736A publication Critical patent/JPS5652736A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To achieve the saving of power consumption by series-connecting a Zener diode to the diode connected between the base and emitter of an NPN transistor for oscillation. CONSTITUTION:A Zener diode ZD1 is series-connected to the diode D2 for protecting transistor connected between the base and emitter of an oscillating trnasistor TRQ1. At the time when the TRQ1 shifts from ON to OFF in the process of oscillation action, a counter electromotive voltage is generated in the coil L3 of an oscillating transformer. This counter electromotive voltage is applied to the series circuit of the diodes D2, ZD1, but since the diode D2 is maintained in a non-conducting state by the diode ZD1, the inverse charging to the capacitor C2 is prevented. In this way, the protection of the TRQ1 may be performed and the wasteful power consumption owing to the chraging and discharging of the capacitor C2 may be eliminated.
JP12965079A 1979-10-08 1979-10-08 Flash device Pending JPS5652736A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP12965079A JPS5652736A (en) 1979-10-08 1979-10-08 Flash device
US06/193,458 US4306281A (en) 1979-10-08 1980-10-03 DC-DC Converter for electronic flash unit
DE19803037863 DE3037863A1 (en) 1979-10-08 1980-10-07 DC / DC CONVERTER FOR ELECTRIC FLASH UNITS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12965079A JPS5652736A (en) 1979-10-08 1979-10-08 Flash device

Publications (1)

Publication Number Publication Date
JPS5652736A true JPS5652736A (en) 1981-05-12

Family

ID=15014755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12965079A Pending JPS5652736A (en) 1979-10-08 1979-10-08 Flash device

Country Status (1)

Country Link
JP (1) JPS5652736A (en)

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