Passive infrared detector
US5107120A · kind A · utility
40Cited by
17References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1989 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Sep 22, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S250/01
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A passive infrared detector, including a pyroelectric sensor with three pairs of contiguous, active elements and a Fresnel lens with a plurality of segments each of which has an optical center and an equivalent focal length, each pair of active elements disposed in different plane, with each optical center juxtaposed to the plane of at least one of those active elements, substantially at the focal length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.