Light barrier apparatus for monitoring doorways

Details Light barrier apparatus for monitoring doorways Light barrier apparatus for monitoring doorways

1984-06-05

1986-08-12

Orsino, Jr., Joseph A.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, 455605, G08B 1318

Patent

active

046058508

ABSTRACT:
In a light barrier apparatus for monitoring doorways to the left and to the right of a central post two light transmitter/receiver devices (11, 12) are mounted together with the associated electronic circuitry on a structural element to form a first unit. This unit is releasably secured to a base member which carries two deflecting mirrors (14, 15) and the electrical connection terminals. The unit can be removed from the base member (17) at right angles to a plane which includes the optical axes (11c, 12c) of the light transmitter/receiver devices (11, 12).

REFERENCES:
patent: 3740562 (1973-06-01), Fertig
patent: 3743290 (1973-07-01), Crimmins et al.
patent: 3752978 (1973-08-01), Kahl, Jr. et al.
patent: 4097733 (1978-06-01), Langenbach et al.
patent: 4412129 (1983-10-01), Duncan

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