Alarm system to secure a passage

Details Alarm system to secure a passage Alarm system to secure a passage

1982-07-13

1985-04-30

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250578, 340556, G08B 1308, G08B 1318

Patent

active

045146250

ABSTRACT:
A security system for an opening such as a door, window, or the like wherein the opening is defined with a generally planar orientation having at least a pair of generally diametrically opposed corners, the system including light transmitters arranged in the vicinity of at least one of the corners emitting light from the one corner within an angle limited by the sides of the one corner, the light being directed across the opening in a direction toward the other of the corners, and light receivers for sensing light emitted from the light transmitters, the light receivers being arranged on at least one of the sides of the opposite corner. In one aspect of the invention, the light transmitters are arranged in the vicinity of only one of the corners and the light receivers are arranged on both sides of the opposed corner. In a second aspect of the invention, the light transmitters are arranged in the vicinity of both of the opposed corners and the light receivers are arranged on one of the sides of each of the opposed corners to receive light from the light transmitters arranged in opposed relationship thereto.

REFERENCES:
patent: 3235738 (1966-02-01), Kress et al.
patent: 3739372 (1973-06-01), Schlisser et al.
patent: 3752978 (1973-08-01), Kahl, Jr. et al.
patent: 3805064 (1974-04-01), Kornylak

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