Circuit for light-integrator-controlled electronic flash unit

Details Circuit for light-integrator-controlled electronic flash unit Circuit for light-integrator-controlled electronic flash unit

1976-07-01

1979-01-02

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315159, 315241P, H05B 4132

Patent

active

041329236

ABSTRACT:
The flash unit includes a flash element and a first electronic switch connected in the current path of the flash element. The flash element is ignited by rendering the first switch conductive. Flash-terminating circuitry terminates the flash by rendering the first switch non-conductive. The flash-terminating circuit includes a commutation capacitor and a second electronic switch interconnected with each other and with the first switch for applying the commutation capacitor voltage to the first electronic switch as a reverse-bias voltage when the second electronic switch is rendered conductive. The second electronic switch is a two-electrode electronic switch which can be rendered conductive by raising the voltage across its electrodes above the value at which such voltage is normally maintained. A light-integrating device detects the light emitted by the flash element and when such amount has reached a predetermined value renders the second electronic switch conductive by raising the voltage across the electrodes of the second electronic switch.

REFERENCES:
patent: 3809954 (1974-05-01), Engelstatter
patent: 3878433 (1975-04-01), Sato

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