Infrared intrusion detector circuit
US4179691A · kind A · utility
53Cited by
4References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1977 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | Jul 22, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S250/01
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A circuit for an infrared intrusion detector comprising a plurality of receiving directions or regions which are separated from one another and a radiation receiver, at the output of which there appears an electrical signal corresponding to the infrared radiation which is absorbed by all of the receiving directions or regions. The circuit is structured such that an alarm signal is delivered when the received infrared radiation both ascends in a predetermined manner as well as descends in a predetermined manner within a given delay time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.