Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1983-05-10
1986-01-07
Corbin, John K.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250208, 307473, 358212, H01J 4014
Patent
active
045635900
ABSTRACT:
An arrangement with several phototransistors wherein the phototransistors are interconnected in such a way that n (n-1) (n-2) phototransistors can be triggered with n leads, n being one whole number larger than or equal to 3, the three connections emitter, base and collector of each phototransistor being connected to three different leads, no two phototransistors being connected in the same way to the same leads, the leads being able to take on three states, i.e., (1) grounded, (2) open and (3) connected to a voltage source, of the leads at a certain point in time only one lead being open and only one other lead being connected to the voltage source, the voltage source, on the one hand, being so small that it cannot drive a noticeable current over the base-emitter path of each phototransistor, but, on the other hand, being sufficiently large to be able to drive a noticeable current over the collector-emitter path of a phototransistor if this phototransistor is illuminated, and a flow of current being ascertainable for each lead when this lead is in the grounded state.
REFERENCES:
patent: 3706129 (1972-12-01), McCann
patent: 4037114 (1977-07-01), Stewart et al.
patent: 4293735 (1981-10-01), Duret
patent: 4463383 (1984-07-01), Soneda et al.
Gillessen Klaus
Malinowski Christopher
Corbin John K.
Eyssallenne R. B.
Telefunken electronic GmbH
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