EP 0219954 A1 19870429 - An infra-red detector system.
Title (en)
An infra-red detector system.
Title (de)
Infrarot-Detektorsystem.
Title (fr)
Système détecteur infrarouge.
Publication
Application
Priority
GB 8522086 A 19850905
Abstract (en)
An infra-red intruder detection apparatus has an optical system comprising a Fresnel plate (7) and an infra-red sensor (5) positioned at the focus of the Fresnel plate. An optical path extending from the Fresnel plate to the infra-red sensor is bounded on either side by first and second mirrors (2, 3) diverging from the sensor towards the Fresnel plate to thereby provide a first fan of field of view for the sensor. A third mirror (4) is preferably disposed above the optical path to thereby provide a second fan of field of view for the sensor below the first said fan.
IPC 1-7
IPC 8 full level
G08B 13/193 (2006.01)
CPC (source: EP)
G08B 13/193 (2013.01)
Citation (search report)
- [Y] US 4442359 A 19840410 - LEDERER DAVID B [US]
- [Y] US 4087688 A 19780502 - KELLER HANSJURG
- [AP] DE 3424135 A1 19860109 - HIRSCHMANN RADIOTECHNIK [DE]
- [A] DE 2836462 A1 19800306 - WOERL ALARM AUGUST WOERL INHAB
- [AP] EP 0177130 B1 19890308
- [A] EP 0065159 A2 19821124 - HIRSCHMANN RADIOTECHNIK [DE]
- [A] US 3703718 A 19721121 - BERMAN HERBERT L
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 86306815 A 19860903; GB 8522086 A 19850905