Flash circuit

Details Flash circuit Flash circuit

1997-09-19

1999-10-12

Perkey, W. B.

Photography

With object illumination for exposure

With power supply detail

G03B 1505, H05B 4126

Patent

active

059665521

ABSTRACT:
A flash circuit of a flash device for a camera or a lens-fitted photo film unit is provided with a Zener diode connected to a tap point located at an intermediate position of a secondary coil of an oscillation transformer, to tap out voltage that is proportional to but less than charge voltage in a main capacitor. When the main capacitor is charged up to a set voltage, the Zener diode conducts a Zener current, which deactivates an oscillation transistor through a stopping transistor.

REFERENCES:
patent: 4071884 (1978-01-01), Maigret

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