Two terminal light barrier system

Details Two terminal light barrier system Two terminal light barrier system

1987-06-15

1988-12-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, G01V 904

Patent

active

047897783

ABSTRACT:
A light barrier system having a two-terminal network that is connected in series with a precision resistor. In normal operation, in this two-terminal system, two different potential drops occur, according to whether the light path between the light-emitting and the light-receiving elements of the light barrier arrangement is interrupted or not. Correspondingly, one input of a monitoring circuit is located at two different levels. In the event of a breakage of the supply lines or a short circuit of the light barrier system, the input is located at an extremely high or extremely low level.

REFERENCES:
patent: 2777934 (1957-01-01), Falkenthal
patent: 3083966 (1963-04-01), Untiedt
patent: 3714644 (1973-01-01), Hellstrom
patent: 3946241 (1976-03-01), Malinowski
patent: 4012635 (1977-03-01), Walter et al.
patent: 4268823 (1981-05-01), Rauchut et al.
patent: 4546345 (1985-10-01), Naito

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