Flashlight control circuit

Details Flashlight control circuit Flashlight control circuit

2006-09-12

2006-09-12

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

C315S107000

Reexamination Certificate

active

07106008

ABSTRACT:
A flashlight control circuit is provided to control the flash according to an exposure voltage and a predetermined voltage. Either a first comparator, second comparator and logic gate or a comparator, a first inverter, a first transistor, a first logic gate and a second logic gate may be included in the control circuit. The provided circuit enables the capacitor to discharge promptly when the trigger signal stops. Therefore, an additional control signal for discharge is not necessary. Furthermore, the circuit has a clamping circuit to clamp the exposure voltage at a lower level than the predetermined voltage according to a full flash signal.

REFERENCES:
patent: 4623929 (1986-11-01), Johnson et al.
patent: 5159381 (1992-10-01), Harrison
patent: 6349175 (2002-02-01), Tokunaga
patent: 6359651 (2002-03-01), Yokonuma
patent: 6441856 (2002-08-01), Sugimoto
patent: 562986 (2003-11-01), None
patent: 570206 (2004-01-01), None

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