Light projector and detector unit

Details Light projector and detector unit Light projector and detector unit

1975-02-18

1977-03-22

McGraw, Vincent P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, 340258B, G01D 2104

Patent

active

040138860

ABSTRACT:
The light beam projector and the directive light receiver of a light barr intrusion detector are mounted side by side on a common mounting body which is angularly adjustable in a fixed casing, so as to direct the projected light for maximum reflection to the receiver by a remote mirror. A light emitting diode is provided as a visible indicator on or near the casing or the mounting and responds to the photosensitive element of the receiver through an intermediate amplifier, so that its brightness enables the effectiveness of the directional adjustment to be easily observed.

REFERENCES:
patent: 3041461 (1962-06-01), Lindemann et al.
patent: 3578978 (1971-05-01), Laurent
patent: 3619629 (1971-11-01), Matthews
patent: 3816745 (1974-06-01), Primm et al.

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