| CPC G08B 17/107 (2013.01) | 14 Claims |
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1. A smoke detector, comprising:
a substrate having a ring shape region surrounding a central detection region, and a first block structure of the central detection region being protruded from the substrate and higher than an upper surface of the ring shape region;
an optical detection module disposed inside the central detection region;
a base disposed on the substrate and around the optical detection module, the base having a second block structure; and
a top cover connected to the base, a lateral wall of the top cover being partly overlapped with the second block structure to form a guiding channel, the optical detection module analyzing variation of scattering parameters resulted from gaseous matter entering the top cover through the guiding channel for determining concentration of the gaseous matter;
wherein the top cover comprises the lateral wall and a cover body connected to each other, at least one of the lateral wall and the cover body has an airtight property.
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