Ceiling mounted passive infrared intrusion detector with dome shaped lens
US4757204A · kind A · utility
30Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1986 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Jan 28, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S250/01
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A passive infrared intrusion detector is arranged for mounting to the ceiling of a room to be protected. Infrared radiation from points within the room is focused onto an infrared sensing element by a multi-segment dome-shaped lens. The multi-segment lens in a preferred embodiment has central, downwardly facing beams of infrared sensitivity and other beams of infrared sensitivity at multiple azimuth angles at selected elevation angles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.