Title: Smoke alarm
Application Number: 97190934 Application Date: 1997.07.15
Publication Number: 1198237 Publication Date: 1998.11.04
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G08B17/107
Applicant(s) Name: Cerberus AG Address:
Inventor(s) Name: U. Riedi;B. Durrer;K. Hess
Attorney & Agent: ma tieliang
Abstract:
    The smoke alarm comprises an alarm unit (1) that can be inserted in a socket and that contains an optical module. This optical module has a light source (6), a light receiver (7), a measurement chamber(8), a central diaphragm (10), a base (11) and a labyrinth system with diaphragms (9) arranged on the periphery of the photogrammetric chamber. The peripheral stops (9) are so arranged that the angle of incidence of the light beam emitted by the light source (6) and received by the light detector (7) is constant on the majority of them. The angle of incidence is selected so that the incident and unabsorbed light is reflected as many times as possible between the peripheral diaphragms (9).
Time: 6
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