Smart lookdown function switch design for intrusion detectors
US9915566B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2015 |
| Grant date | Mar 13, 2018 |
| Priority date | — |
| Expiry date | Apr 17, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/193
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system is provided that includes a security system that protects a secured area, a passive infrared (PIR) detector of the security system that detects intruders within the secured area, a pyroelectric element carried by the PIR detector, the pyroelectric element being tilted downwards towards a floor within the secured area to receive and detect a predominant portion of energy from an area extending outwards from the PIR detector and directly in front of the PIR detector and a relatively small portion of energy from a floor area directly below the PIR detector, and a pivoting door having first and second positions mounted below and directly adjacent the pyroelectric element, the door pivoting upwards to the first position where the relatively small portion of energy is blocked and pivoting downwards where the relatively small portion of energy is transmitted onto the pyroelectric element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.