Control of electronically generated light pulses

Details Control of electronically generated light pulses Control of electronically generated light pulses

1977-05-24

1978-12-05

La Roche, Eugene

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315241P, H05B 4132

Patent

active

041287860

ABSTRACT:
Circuits and auxiliary elements for use with a device for controlling the emission of light pulses from a flash unit, which light pulses are produced by the discharge of current pulses from a capacitor, the device including a light sensing element for receiving light produced by the flash unit and reflected from an object in the light path. One such circuit includes a switch which is selectively operable to permit control of termination of the emission of light pulses at either one of two light intensity output levels. Another circuit permits one light sensing element to normally trigger the emission of a light pulse in response to a light pulse from a remote unit, and to be selectively connected to subsequently control termination of such emission. One such element is a special gas filled switching tube having two internal electrodes for triggering conduction through the tube in response to a low voltage. One further element is a special gas filled tube having no internal electrode and constructed to be triggered by receipt of a light emission.

REFERENCES:
patent: 2946924 (1960-07-01), Gerlach et al.
patent: 3519879 (1970-07-01), Ogawa

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