Charge detection display type electronic flash

Details Charge detection display type electronic flash Charge detection display type electronic flash

1980-08-29

1983-05-24

Adams, Russell E.

Illumination

Supported by vehicle structure

Condition responsive

354145, 362 10, G03B 1503

Patent

active

043847765

ABSTRACT:
A charge detection display type electronic flash in which the fact that the main capacitor is charged is detected and the flash is prevented from operating until the main storage capacitor is fully charged and in which triggering of the flash tube is prevented once the power switch has been turned off. A neon lamp is coupled through a resistor between the output of a DC-DC converter and a parallel combination of an impedance element and a second capacitor. A diode is coupled across the neon lamp. The X contact of the camera is connected between a thyristor which operates the triggering circuit of the flash and the common connection point of the impedance element and the neon lamp. A camera control circuit may be coupled as well to this point.

REFERENCES:
patent: 4196458 (1980-04-01), Kondo
patent: 4196988 (1980-04-01), Kawasaki

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