EP 1983495 B1 20091021 - Smoke detector with device adjacent to a reflector for selecting a light beam
Title (en)
Smoke detector with device adjacent to a reflector for selecting a light beam
Title (de)
Rauchmelder mit Vorrichtung an einem Reflektor zum Selektieren eines Lichtstrahles
Title (fr)
Détecteur de fumée avec dispositif adjacent à un réflecteur pour sélectionner un faisceau lumineux
Publication
Application
Priority
FR 0754607 A 20070420
Abstract (en)
[origin: EP1983495A1] The detector (2) has a transmitter (4) transmitting light beams, and a receiver (8) e.g. photodiode, receiving the beams reflected by a reflector (6) e.g. retro-reflector. An exploitation circuit (11) receives characteristic signals of the transmitted and received beams, and generates a smoke detection signal based on the signals. A mask (12) is placed adjacent to the reflector and selects the beams having a transmission direction (E) belonging to a predefined angular range in a given axial plane. The mask is made of opaque plastic material, and has an absorption unit and tubes (14).
IPC 8 full level
G08B 17/103 (2006.01)
CPC (source: EP US)
G08B 17/103 (2013.01 - EP US); G08B 17/113 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1983495 A1 20081022; EP 1983495 B1 20091021; AT E446560 T1 20091115; DE 602008000224 D1 20091203; FR 2915284 A1 20081024; FR 2915284 B1 20090710; US 2008304067 A1 20081211
DOCDB simple family (application)
EP 08103541 A 20080415; AT 08103541 T 20080415; DE 602008000224 T 20080415; FR 0754607 A 20070420; US 14848808 A 20080418