Global Patent Index - EP 0050751 B1

EP 0050751 B1 1987-01-07 - OPTICAL ARRANGEMENT FOR AN INFRARED INTRUSION DETECTOR

Title (en)

OPTICAL ARRANGEMENT FOR AN INFRARED INTRUSION DETECTOR

Publication

EP 0050751 B1 (DE)

Application

EP 81107844 A

Priority

CH 792580 A

Abstract (en)

[origin: US4429224A] The optical arrangement for an infrared intrusion detector containing a plurality of separate radiation receiving regions or fields of view is provided with a first focussing optic or optical system, for instance a Fresnel lense which receives with its entire surface or area the infrared radiation which arrives from all of the receiving regions and delivers such received radiation to a multiplicity of further focussing means, for instance to individual reflectors. These reflectors are correlated in each instance to one of the receiving regions or fields of view and focus the radiation arriving from such receiving region upon a sensor element. In this way there is attained the beneficial result of optimum utilization of the infrared radiation which is available and the sensitivity of the infrared intrusion detector can be increased. The dimensions of the optical arrangement and the intrusion detector can be maintained small and relatively imperceptible.

IPC 1-7 (main, further and additional classification)

G08B 13/18

IPC 8 full level (invention and additional information)

G08B 13/18 (2006.01); G01V 8/14 (2006.01); G08B 13/191 (2006.01); G08B 13/193 (2006.01)

CPC (invention and additional information)

G08B 13/193 (2013.01); Y10S 250/01 (2013.01)

Citation (examination)

Designated contracting state (EPC)

AT BE DE FR GB IT LU NL SE

DOCDB simple family

EP 0050751 A1 19820505; EP 0050751 B1 19870107; AU 542797 B2 19850314; AU 7669481 A 19820429; CH 650604 A5 19850731; DE 3175818 D1 19870212; JP S5797481 A 19820617; US 4429224 A 19840131