Electronic control circuitry for terminating flash output

Details Electronic control circuitry for terminating flash output Electronic control circuitry for terminating flash output

1979-04-16

1980-07-01

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315151, 354 33, H05B 4132

Patent

active

042108497

ABSTRACT:
A semiconductor switching element is connected in series with a flash tube to stop emission of flash light therefrom during operation of the flash tube. A first and a second integrating circuit are parallelly arranged to be connected either alternatively, or both together, with the switching element. The first integrating circuit integrates photo-current generated by a photocell receiving light from an object illuminated by the flash light, and the second integrating circuit integrates current that is manually adjustable. When both integrating circuits are connected with the switching element, the switching element is turned off by that integrating circuit which first reaches a predetermined trigger level.

REFERENCES:
patent: 3710701 (1973-01-01), Takishima et al.
patent: 4012665 (1977-03-01), Nakamura et al.

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