Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1975-05-08
1976-09-28
Segal, Robert
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Load device irradiating the radiant energy responsive device
315159, 315241P, H05B 4100, H05B 4132, G03B 1505
Patent
active
039834484
ABSTRACT:
In an automatic strobo flash device of the type in which when the quantity of light reflected back from a subject reaches a predetermined level, a switching capacitor is discharged to turn off a silicon-controlled rectifier connected in series to a flash tube so that the strobo flash is automatically extinguished, an indicating means for generating the sound or light signal indicating that the recharge of the switching capacitor is still being made is provided which is actuated when the voltage across a voltage regulator element such as a zener diode inserted in a circuit for recharging the switching capacitor reaches a predetermined level. A malfunction or erratic operation of the strobo flash device may be easily detected, and the correct strobo flash automatically controlled may be ensured.
REFERENCES:
patent: 3688664 (1972-09-01), Mashimo
patent: 3740610 (1973-06-01), Roncke
Segal Robert
West Electric Company Ltd.
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