Photoelectric switch

Details Photoelectric switch Photoelectric switch

1981-06-16

1983-06-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

043885276

ABSTRACT:
There is provided a photoelectric switch comprising a photoelectric detection means, a circuit means disposed independently of the detection means, and cable means interconnecting the detection and circuit means, there being formed in the photoelectric detection means a parallel circuit comprised of a light emission photodiode and a display photodiode of opposite polarity thereto as connected in parallel-circuit relation, which parallel circuit is connected to a pulse oscillation circuit included in the circuit means with a couple of lines, whereby a pulse current of single polarity is applied from the pulse oscillation circuit to the parallel circuit to thereby actuate only the light emission photodiode, and there being disposed in the circuit means a display circuit which functions in response to a detection output obtained in the circuit means so that through the tow lines a pulse current of opposite polarity to the first-mentioned pulse current flows to the parallel circuit in a phase where the first-mentioned pulse current is non-existent to thereby actuate the display photodiode.

REFERENCES:
patent: 3859647 (1975-01-01), Ross

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