Solid-state limit switch utilizing infrared link

Details Solid-state limit switch utilizing infrared link Solid-state limit switch utilizing infrared link

1976-03-05

1977-12-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214R, 307311, G01D 534

Patent

active

040656691

ABSTRACT:
A limit switch utilizing static components and an infrared light emitting diode in conjunction with a photosensitive transistor. A mechanical shutter is provided for insertion between the diode and transistor to interrupt the infrared link therebetween, this will occur when a predetermined limit is reached by an object which is controlled by the limit switch. The limit switch is of the two terminal type, that is it requires no separate source of power for operation than the power in the line being controlled by the switch. It is adapted for high temperature operation.

REFERENCES:
patent: 3495777 (1970-02-01), Evalds et al.
patent: 3631250 (1971-12-01), Van Buskirk
patent: 3721123 (1973-03-01), Heim
patent: 3783274 (1974-01-01), Towne et al.

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