Actuating circuit for light measuring circuit in electronic flas

Details Actuating circuit for light measuring circuit in electronic flas Actuating circuit for light measuring circuit in electronic flas

1979-09-21

1981-03-17

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315173, 315241P, H05B 4132

Patent

active

042569940

ABSTRACT:
A computer type electronic flash device is disclosed. The flash device has an auxiliary capacitor for producing a bias voltage which is to be superimposed on the charged voltage across the main capacitor upon triggering of the flash tube, and an impedance circuit provided in the discharge path of the auxiliary capacitor to produce an actuating voltage for the light measuring circuit when the auxiliary capacitor produces the above-described bias voltage.

REFERENCES:
patent: 3878433 (1975-04-01), Sato
patent: 3912968 (1975-10-01), Nakamura
patent: 4082982 (1978-04-01), Hirata

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