EP 0537024 A1 19930414 - Infra-red detection apparatus.
Title (en)
Infra-red detection apparatus.
Title (de)
Infrarote-Detektierungsvorrichtung.
Title (fr)
Dispositif de détection à infrarouge.
Publication
Application
Priority
GB 9121523 A 19911010
Abstract (en)
Apparatus for the detection of infra-red radiation comprises a passive infra-red sensor (16), a focusing reflector (20) constructed and arranged to focus infra-red radiation received by the apparatus from a first range of distances from the apparatus, on the sensor (16) , and a focusing refractor (14) constructed and arranged to focus infra-red radiation received by the apparatus from a second range of distances from the apparatus, on the sensor (16), the second distance range encompassing distances shorter than the first distance range. The refractor may be a Fresnel lens (14) or an array of Fresnel lenses (32, 33, 34) formed in a polyethylene window (12) through which the radiation is transmitted. The reflector (20) may be a concave reflector and a second plane reflector (22) may be included to produce a more compact construction. <IMAGE>
IPC 1-7
IPC 8 full level
G08B 13/193 (2006.01)
CPC (source: EP)
G08B 13/193 (2013.01)
Citation (search report)
- [A] DE 3812969 A1 19891102 - MERTEN GMBH & CO KG GEB [DE]
- [A] EP 0219954 A1 19870429 - MAXIMAL ELECTRICAL ENG LTD [GB]
- [A] US 4841284 A 19890620 - BIERSDORFF JACK L [US]
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0537024 A1 19930414; EP 0537024 B1 19950531; AT E123348 T1 19950615; DE 69202745 D1 19950706; DE 69202745 T2 19951012; DK 0537024 T3 19950731; ES 2072712 T3 19950716; GB 9121523 D0 19911127
DOCDB simple family (application)
EP 92309235 A 19921009; AT 92309235 T 19921009; DE 69202745 T 19921009; DK 92309235 T 19921009; ES 92309235 T 19921009; GB 9121523 A 19911010