Infrared intrusion detector
US5066855A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Jan 24, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S250/01
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An improved infrared intrusion detector is provided which conveniently and expeditiously monitors two fields of view by use of a single sensor. In a preferred embodiment, the improved intrusion detector monitors fields of views which are substantially orthogonal in a nonobvious manner. It is nonobvious in that an aperture is provided in a housing which permits radiation from a second field of view to enter the housing. Internal optical elements are provided to direct this incident radiation from the second field of view onto a sensor used for the first field of view. The internal optical elements are protected from the environment and do not give advance warning that a second field of view is monitored. Generally, the second field of view is below the intrusion detector to detect unauthorized activity in a dead zone below the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.