Light barrier system

Details Light barrier system Light barrier system

1975-08-13

1977-03-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340258B, G01D 2104

Patent

active

040126358

ABSTRACT:
A light barrier system is provided which includes a light transmitter, a light receiver to receive the light beam transmitted over a predetermined path, an indicator unit which is connected to the light receiver and produces a signal when an obstacle is detected in the path, and a power unit supplying the light transmitter, light receiver and indicator unit. The power unit consists essentially only of a rectifier. A pulsed light source is employed, operated by the discharge of a capacitor in the rectifier output.

REFERENCES:
patent: 3605082 (1971-09-01), Matthews
patent: 3711846 (1973-01-01), Schlisser et al.
patent: 3723737 (1973-03-01), Zeldman et al.
patent: 3859647 (1975-01-01), Ross
patent: 3898588 (1975-08-01), Skagerlund
patent: 3914753 (1975-10-01), Cho

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