CPC G01N 15/06 (2013.01) [G08B 17/107 (2013.01); G08B 29/18 (2013.01); G01N 2015/0046 (2013.01); G01N 2015/0693 (2013.01)] | 14 Claims |
1. A smoke detector, comprising:
a substrate;
a light source, arranged on an upper surface of the substrate;
a light sensor, arranged on the upper surface of the substrate; and
a ring wall, arranged on the upper surface of the substrate and surrounding the light source, and configured to move an illumination range of the light source toward the light sensor, wherein a first part of the ring wall farther from the light sensor has a height more than double of a height of a second part of the ring wall closer to the light sensor.
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