Photoelectric detector having an indicator for indicating the op

Details Photoelectric detector having an indicator for indicating the op Photoelectric detector having an indicator for indicating the op

1976-06-02

1977-09-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250552, 250239, G01D 2104

Patent

active

040513653

ABSTRACT:
A photoelectric detector for detecting the presence of an object which comprises at least a light ray projecting element, for example, of a luminescent diode and a light ray receiving photoelectric element, for example, of a photo transistor. The two elements are respectively received in bores formed in a housing in such a manner that only the light rays emitted by the projecting elements is received by the receiving element with any lights due to irregular reflection prevented from reaching the receiving element so as to avoid erroneous functioning of the detector.

REFERENCES:
patent: 3444544 (1969-05-01), Pearson et al.
patent: 3576277 (1971-04-01), Blackmon
patent: 3654477 (1972-04-01), Benjamin
patent: 3737685 (1973-06-01), Sharp
patent: 3816745 (1974-06-01), Primm et al.
patent: 3842263 (1974-10-01), Kornrumpf et al.
patent: 3862415 (1975-01-01), Harnden et al.

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