Photo-electric detector with temperature-compensated circuit

Details Photo-electric detector with temperature-compensated circuit Photo-electric detector with temperature-compensated circuit

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.

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