JPS5677830A - Controller for quantity of emitted light of flash unit - Google Patents
Controller for quantity of emitted light of flash unitInfo
- 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
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.
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) |
-
1979
- 1979-11-30 JP JP15500579A patent/JPS5677830A/en active Pending
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