Light-curtain area security system

Details Light-curtain area security system Light-curtain area security system

1986-08-08

1988-05-03

Swann, III., Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250221, 340506, G08B 1318

Patent

active

047423374

ABSTRACT:
An area-security system comprises a transmitting/receiving strip arranged along one side of an area to be secured and a reflection strip arranged along the other side. The transmitting/receiving strip is divided into transmitting regions and receiving regions, the transmitting regions consisting of a plurality of transmitting elements which are arranged alongside of each other and which are combined in at least two groups, and the receiving regions also consisting of a plurality of receiving elements which are arranged alongside of each other and are also combined in at least two groups. Modulated light from the transmitting elements strikes the receiving regions after being reflected by the reflection strip. A control circuit determines association of different groups of receiving elements with the individual groups of transmitting elements. A multi-channel evaluation, under the synchronizing control of a control circuit, evaluates the signals on the basis of various factors. The area-security system is particularly suitable for penetration-security or for entry-security application, and for the securing or control of machines.

REFERENCES:
patent: 3746863 (1973-07-01), Pronovost
patent: 4180726 (1979-12-01), DeCrescent
patent: 4266219 (1981-05-01), Foster et al.
patent: 4649270 (1987-03-01), Goldenberg

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