Photoelectric switch having changeable length

Details Photoelectric switch having changeable length Photoelectric switch having changeable length

1989-10-30

1991-03-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, G01V 904

Patent

active

050031694

ABSTRACT:
A photoelectric switch which includes a light-emitting section having a plurality of light-emitting elements arranged in a line, and a light-detecting section having a plurality of light-detecting elements arranged in a line in such a manner that the light-emitting elements confront with the light-detecting elements, thus providing a multi-optical path therebetween. Each of the light-emitting section and light-detecting section is formed by connecting a base unit to a relay unit and/or an end unit, whereby the length or configuration of the photoelectric switch can be readily changed by changing the number or configuration of the relay unit connected to the base unit.

REFERENCES:
patent: 4266124 (1981-05-01), Weber et al.
patent: 4742337 (1988-05-01), Haag
patent: 4749853 (1988-06-01), Salim

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