US 11,854,361 B2
Smoke detector with protrusions
Cheng-Nan Tsai, Hsin-Chu County (TW); Guo-Zhen Wang, Hsin-Chu County (TW); Ching-Kun Chen, Hsin-Chu County (TW); Yen-Chang Chu, Hsin-Chu County (TW); and Chih-Ming Sun, Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on Feb. 20, 2023, as Appl. No. 18/111,605.
Application 18/111,605 is a division 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 2023/0206743 A1, Jun. 29, 2023
Int. Cl. G08B 17/10 (2006.01); G08B 17/107 (2006.01)
CPC G08B 17/107 (2013.01) 5 Claims
OG exemplary drawing
 
1. A smoke detector, comprising:
a light source;
a light sensor, configured to receive reflected light of emission light of the light source to generate a detection signal;
a bottom surface, comprising multiple protrusions extending out from the bottom surface, wherein the multiple protrusions are configured to block reflected light from the bottom surface,
a side wall, extending out from an edge of the bottom surface, and having apertures; and
a reflective surface, arranged at an inner surface of the side wall,
wherein the light source and the light sensor are arranged at the inner surface of the side wall and opposite to the reflective surface.