Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1975-05-23
1977-09-20
La Roche, Eugene
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
250214SF, 315149, 315159, 315241P, 354 33, 354131, H05B 4132
Patent
active
040499960
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: 3288044 (1966-11-01), Bramer
patent: 3591829 (1971-07-01), Murata et al.
patent: 3709123 (1973-01-01), Tokutomi
patent: 3944877 (1976-03-01), Sato
Orban Jean
Vital Zoltan
La Roche Eugene
Ponder & Best Inc.
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