Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy control of an electric discharge device in...
Patent
1975-05-02
1977-06-14
Segal, Robert
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy control of an electric discharge device in...
315151, H05B 4102, H05B 4132
Patent
active
040299929
ABSTRACT:
The light sensitive circuit which controls the voltage at the control electrode of the thyristor used to control the termination of the flash includes a photosensor and a resistor-capacitor integrator circuit connected to the photosensor. The voltage across the capacitor is applied to the control electrode of the thyristor. In accordance with the present invention, a diode connected in series with a variable resistor is connected in parallel with the resistor of the integrator circuit. An additional resistor may be connected in parallel with the capacitor and a further resistor in parallel with the whole integrator circuit in order to allow adjustment of the operating region of the diodes such that it has a very low resistance only when a very high quantity of light as reflected by a very close object impinges upon the photosensor.
REFERENCES:
patent: 3037144 (1962-05-01), Mantia
patent: 3519879 (1970-07-01), Ogawa
patent: 3662213 (1972-05-01), Dennewitz et al.
patent: 3769546 (1973-10-01), Pecher et al.
patent: 3769546 (1973-10-01), Pecher et al.
patent: 3835351 (1974-09-01), Schneider
patent: 3869642 (1975-03-01), Sabanci
Braun Aktiengesellschaft
Segal Robert
Striker Michael J.
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