Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1985-10-23
1987-11-17
Buczinski, Stephen C.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250353, 340555, 340567, 350619, G01J 100, G08B 1318
Patent
active
047076046
ABSTRACT:
The disclosed ceiling mountable passive infrared intrusion detection system includes a field forming mirror assembly and a focusing mirror assembly cooperative to provide a field of view having plural first vertical curtains, a generally disc-shaped horizontal second curtain, and a generally conical downwardly directed third curtain. In one embodiment, first and second conical field forming mirrors are cooperative with different and spaced-apart spherical focusing mirrors to provide the horizontal curtain and the downwardly directed conical curtain. An unbalanced detector is disclosed that cooperates with the energy pattern received from the conical field forming mirrors to signal intruder presence. In another embodiment, first and second pluralities of planar field forming mirrors are cooperative with the different and spaced-apart spherical focusing mirrors to respectively provide a first plurality of substantially horizontal finger beams and a second plurality of plural downwardly directed finger beams. In this embodiment, a balanced detector is disclosed that cooperates with the energy pattern received from the first and second pluralities of finger beams to signal intruder presence.
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ADT Inc.
Buczinski Stephen C.
LandOfFree
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