Reflection-type photoelectric switching apparatus with light-adj

Details Reflection-type photoelectric switching apparatus with light-adj Reflection-type photoelectric switching apparatus with light-adj

1983-12-20

1987-01-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, H01J 516

Patent

active

046381546

ABSTRACT:
A reflection-type photoelectric switching apparatus comprising a lamp for projecting light rays to an object, a photoelectric element for receiving reflected light rays from the object, a reference photoelectric element mounted on a board in side-by-side relation with the photoelectric element, a light conducting means for guiding a part of said light rays from the lamp to the reference photoelectric element, and an adjusting means for adjusting the quantity of light rays guided by the light conducting means to be balanced with that of the reflected light rays received by the photoelectric element.

REFERENCES:
patent: 3758784 (1973-09-01), Vischulis
patent: 3881825 (1975-05-01), Chisholm
patent: 3986777 (1976-10-01), Roll

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