US 12,106,649 B2
Smoke detector capable of distinguishing smoke and particles
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)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on Nov. 15, 2023, as Appl. No. 18/509,350.
Application 18/111,605 is a division of application No. 17/320,222, filed on May 14, 2021, granted, now 11,615,684.
Application 18/509,350 is a continuation of application No. 18/111,605, filed on Feb. 20, 2023, granted, now 11,854,361.
Claims priority of provisional application 63/117,479, filed on Nov. 24, 2020.
Prior Publication US 2024/0078887 A1, Mar. 7, 2024
Int. Cl. G08B 17/10 (2006.01); G08B 17/107 (2006.01)
CPC G08B 17/107 (2013.01) 20 Claims
OG exemplary drawing
 
1. A smoke detector, comprising:
a base;
a cover, configured to be combined to the base to form an inner space between the base and the cover;
a first light source, arranged on the base and configured to emit light of a wavelength toward the inner space;
a second light source, arranged on the base and configured to emit light of the wavelength toward the inner space;
a light sensor, arranged on the base between the first light source and the second light source, and configured to generate a first detection signal in response to light emission of the first light source and generate a second detection signal in response to light emission of the second light source; and
a processor, configured to distinguish smoke and floating particles in the inner space according to a similarity between the first detection signal and the second detection signal.