Proximity sensor with simultaneously active intermixed sensor ty

Details Proximity sensor with simultaneously active intermixed sensor ty Proximity sensor with simultaneously active intermixed sensor ty

1974-10-10

1976-06-29

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340267R, G08B 1318

Patent

active

039672611

ABSTRACT:
The invention provides an improvement over my earlier U.S. Pat. No. 3,573,783 whereby different types of sensors may be indiscriminately intermingled, intermixed or otherwise used together simultaneously, in the same proximity sensing systems. An antenna sensor may be used when line of sight detection is not appropriate. A photosensor may be used when line of sight detection may be used. Both types of sensors may be used simultaneously, or each may be used separately. The invention is broad enough to enable simultaneous use of almost any other types of sensors. This intermixture is achieved by use of a balanced bridge-like circuit which may be unbalanced either by an intrusion, movement, or exit or any person or object in the field of an antenna or by a snap-action-like sensor, such as a photocell, for example.

REFERENCES:
patent: 2963627 (1960-12-01), Buchsbaum
patent: 3573783 (1971-04-01), Fudaley
patent: 3613064 (1971-10-01), Peterson et al.
patent: 3636542 (1972-01-01), Apple
patent: 3731294 (1973-05-01), Vass

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