Intrusion detector
US8368535B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 2008 |
| Grant date | Feb 5, 2013 |
| Priority date | — |
| Expiry date | May 6, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/19
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An intrusion detector comprising a passive sensor for detecting a person entering a space to be monitored, said intrusion detector comprising a housing provided with a window for said passive sensor, optical means for directing electromagnetic radiation from said person onto the passive sensor, alarm means connected to said passive sensor for generating an alarm in case the electromagnetic radiation from said person being detected by the passive sensor corresponds to a signal value that exceeds a maximum level or falls below a minimum level, a special feature being the fact that the optical means are provided with a mirror curved in two directions for forming at least one protective curtain extending in a vertical plane in the space to be monitored, wherein the passive sensor is disposed on the optical axis at the focus of the mirror, and wherein the mirror directs a beam of electromagnetic radiation from the person, rotated through at least 45°, preferably through at least substantially 90°, onto the passive sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.