EP 0175940 B1 19901205 - PHOTOELECTRIC SMOKE DETECTOR
Title (en)
PHOTOELECTRIC SMOKE DETECTOR
Publication
Application
Priority
- JP 13058784 U 19840830
- JP 17404384 A 19840823
- JP 17940084 A 19840830
Abstract (en)
[origin: EP0175940A1] The device relates to a small-sized photoelectric smoke detector in which the measuring chamber itself has a light trap function and which has a narrow measuring space. The measuring chamber is composed of a front wall (6) which reflects the light from a light emitter (1) at a predetermined angle to the optical axis of the smoke detector, side walls (4, 5) which are arranged nearly parallel with the optical axis. According to a preferred embodiment of the device the measuring chamber comprises a rear wall (7) which reflects the light reflected from the side walls (4, 5) at such an angle that the reflected light does not directly irradiate the light receiver (2). The light trap function of the measuring chamber can be further improved if the walls of the measuring chamber have mirror-like surfaces with good absorbance.
IPC 1-7
IPC 8 full level
G08B 17/107 (2006.01)
CPC (source: EP)
G08B 17/107 (2013.01); G08B 17/113 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0175940 A1 19860402; EP 0175940 B1 19901205; DE 3580817 D1 19910117
DOCDB simple family (application)
EP 85110642 A 19850823; DE 3580817 T 19850823