EP 0218055 B1 19891108 - INFRARED MOVEMENT DETECTOR
Title (en)
INFRARED MOVEMENT DETECTOR
Publication
Application
Priority
DE 3531333 A 19850902
Abstract (en)
[origin: US4752769A] The invention is directed to an infrared motion alarm characterized by an infrared detector and an optical arrangement before the detector in the radiation direction for focussing the infrared radiation onto the detector. The optical arrangement is formed by a mirror arrangement and by a lens arrangement with the mirrors being on different levels so the different beam paths are being detected to prevent an intruder from crawling under the infrared detection beam paths.
IPC 1-7
IPC 8 full level
G01S 3/78 (2006.01); G01S 3/782 (2006.01); G01V 8/14 (2006.01); G08B 13/00 (2006.01); G08B 13/18 (2006.01); G08B 13/193 (2006.01)
CPC (source: EP US)
G08B 13/193 (2013.01 - EP US); Y10S 250/01 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB IT LI NL
DOCDB simple family (publication)
EP 0218055 A1 19870415; EP 0218055 B1 19891108; DE 3666887 D1 19891214; JP S6251482 U 19870331; US 4752769 A 19880621
DOCDB simple family (application)
EP 86111436 A 19860819; DE 3666887 T 19860819; JP 13106886 U 19860827; US 90302686 A 19860902