PIR motion sensor
US7579595B2 · kind B2 · utility
12Cited by
1References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 11, 2007 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Sep 11, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/191
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A passive infrared sensor has two or more element arrays, each consisting of positive polarity and negative polarity elements. The signals from the arrays are both summed together and subtracted from each other, and if either the sum or difference signal exceeds a threshold, detection is indicated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.