Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1974-01-14
1976-03-23
Rolinec, R. V.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
315159, 315241P, H05B 3702
Patent
active
039462692
ABSTRACT:
An electronic flash system including a flashtube, a trigger circuit for actuating the emission of the flashtube, an electric energy storage means for storing the electric energy emitting the flashtube, a discharge circuit connecting the electric energy storage means to the flashtube to produce a flash of light, said discharge circuit including a switching means for electrically break-and-make controlling a connection of the electric energy storage means and the flashtube, a monitoring means for monitoring luminosity of the reflected light from the object to be photographed relying on the flash of light, said monitoring means being adapted to generate an output signal when the luminosity reaches a predetermined value, and a control means for controlling actuation of the switching means in the discharged circuit, said control means being started by its operation in response to actuation of the trigger circuit, the control means generating a control signal for controlling operation of the switching means to open the discharge circuit whenever the output signal from the monitoring means is applied thereto, the switching means being adapted to controll its actuation so that the discharge circuit is maintained in off condition upon termination of performance after the passage of a prescribed time.
REFERENCES:
patent: 3591829 (1971-07-01), Murata et al.
patent: 3675074 (1972-07-01), Dennewitz
patent: 3710701 (1973-01-01), Takishima et al.
patent: 3818266 (1974-06-01), Vital et al.
Dahl Lawrence J.
Rolinec R. V.
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