Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1980-05-22
1982-05-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214C, H01J 4014
Patent
active
043284191
ABSTRACT:
Photo-electric detector comprising a multivibrator with two complementary transistors (T.sub.3 and T.sub.4) of which the base of the first is coupled to the collector of the second by a time constant circuit (R.sub.5 -R.sub.6 -C.sub.1) comprising a resistance (R.sub.5) with negative temperature coefficient. This multivibrator excites an electro-luminescent diode (D.sub.1) which cooperates with a photo-transistor (T.sub.1). After integration, the received signals control a commutator (thyristors Th.sub.1 and Th.sub.2). The circuit is fed by a rectifier bridge with diodes (D.sub.11 to D.sub.14) and formed with two wires.
Application to the detection of the presence of an object which blocks the luminous beam emitted by the diode (D.sub.1).
REFERENCES:
patent: 3992622 (1976-11-01), Numata et al.
patent: 4153835 (1979-05-01), Lau et al.
Drucker William A.
La Telemecanique Electrique
Nelms David C.
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