Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
1972-03-30
1976-03-30
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
039477207
ABSTRACT:
A first thyristor gate whose conductive state is determined by the polarity of a signal applied to its control electrode is connected in series with a flash tube for selectively coupling operating voltage from a flash capacitor to the tube. The first gate is opened by a signal of a first polarity derived from the operating voltage source and generated in synchronism with an ignition pulse, which is applied to the trigger electrode of the flash tube to energize the tube. An integrating circuit energized by a transformer coupled to the flash tube output contains a photosensitive element responsive to a portion of the emitted light for developing a control voltage that increases in proportion to the total light integrated. When the output voltage from the integrating circuit reaches a predetermined value, a second thyristor gate whose control electrode is coupled to the output of the integrating circuit is opened to apply a signal of the opposite polarity to the control electrode of the first thyristor gate. This closes the first gate and disables the flash tube.
REFERENCES:
patent: 3525033 (1970-08-01), Greenburg et al.
patent: 3591829 (1971-07-01), Murata et al.
patent: 3818266 (1974-06-01), Vital et al.
Dahl Lawrence J.
Loewe-Opta GmbH
Rolinec R. V.
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