| 20080266558 | Scattered Light Smoke Detector - The smoke detector contains an optical measuring chamber, having a sensor arrangement with at least one light source and one light receiver, and a labyrinth system with screens arranged on the periphery of the measuring chamber. The light source and the light receiver are each arranged in a housing. The housings have an elongated shape and a small window opening The at least one light source and light receiver are arranged in the rear part of their housings, so that between the window openings of the housings and the light-penetrated optical surfaces of the at least one light source and/or the lens of the light receiver a relatively large gap is formed. This gap is preferably greater than the diameter of the above-mentioned optical surfaces, or of the lens. In the measuring chamber between the light exit and entry side of the housings and the screens opposite them, a compact, open scattering space is formed. | 10-30-2008 |
