Title: Smoke detector
Application Number: 98806808 Application Date: 1998.03.24
Publication Number: 1261972 Publication Date: 2000.08.02
Approval Pub. Date: 2003.06.18 Granted Pub. Date: 2003.06.18
International Classifi-cation: G08B17/107
Applicant(s) Name: Robert Bosch GmbH Address:
Inventor(s) Name: Ulrich Oppelt
Attorney & Agent: liu xinpeng
Abstract:
    A smoke alarm on the scattered radiation principle. Having a measuring field (5), accessible to smoke particles, in a measuring chamber, at which field the radiation direction of a radiation transmitter (6) is aimed, and scattered radiation occurring in the measuring field (5) can be received by a radiation receiver (7); the measuring chamber includes a portion of the hollow ellipsoid (3) which is mirror-coated on the inside; the measuring field (5) is disposed at the first focal point (1) of the hollow ellipsoid; the radiation receiver (7) is disposed at the second focal point (2) of the hollow ellipsoid (3).
Time: 9