US 11,913,864 B2
Smoke detector with increased scattered light intensity
Yen-Chang Chu, Hsin-Chu County (TW); Cheng-Nan Tsai, Hsin-Chu County (TW); and Chih-Ming Sun, Hsin-Chu County (TW)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on May 10, 2022, as Appl. No. 17/740,392.
Application 17/740,392 is a continuation in part of application No. 17/320,222, filed on May 14, 2021, granted, now 11,615,684.
Claims priority of provisional application 63/117,479, filed on Nov. 24, 2020.
Prior Publication US 2022/0268682 A1, Aug. 25, 2022
Int. Cl. G01N 15/06 (2006.01); G08B 17/107 (2006.01); G08B 29/18 (2006.01); G01N 15/00 (2006.01)
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
OG exemplary drawing
 
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.