Patent ID: 7365846
Filing Date: 2008-04-29
Classification: G08B

Abstract:
1. Scattered light smoke detector with an optical measuring chamber, comprising: a sensor arrangement with at least one light source and one light receiver; a labyrinth system with screens arranged on the periphery of the measuring chamber; a housing having an elongated shape and a small window opening that is nearer the measuring chamber than a rear part of the housing and, wherein the at least one light source is arranged in the rear part of the housing, so that between the window opening of the housing and a light-penetrated optical surface of the at least one light source a relatively large gap is formed; wherein the measuring chamber is delimited upward by a carrier disc from which the housing extends downward, and the labyrinth system forms a lid-like component which can be fixed to the carrier disc and has a floor and a side wall, and which can be plugged onto the carrier disc from below; wherein a compact, open scattering space is formed in the measuring chamber between a light exit and an entry side of the housing and screens opposite them; the surfaces, which face each other, of the carrier disc and the floor of the component which forms the labyrinth system have a corrugation.