US 12,462,669 B2
Firm alarm device having two processors
Ching-Kun Chen, Hsin-Chu County (TW); and Guo-Zhen Wang, Hsin-Chu County (TW)
Assigned to PixArt Imaging Inc., Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on Apr. 11, 2024, as Appl. No. 18/632,330.
Application 18/632,330 is a continuation of application No. 17/878,063, filed on Aug. 1, 2022, granted, now 11,990,024.
Prior Publication US 2024/0257632 A1, Aug. 1, 2024
Int. Cl. G08B 29/20 (2006.01); G08B 17/103 (2006.01); G08B 29/18 (2006.01); G08B 25/00 (2006.01)
CPC G08B 29/20 (2013.01) [G08B 17/103 (2013.01); G08B 29/185 (2013.01); G08B 25/008 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fire alarm device, comprising:
a first light source, configured to emit light of first wavelength;
a second light source, configured to emit light of second wavelength, which is different from the light of first wavelength;
a light sensor, configured to detect the light of first wavelength and the light of second wavelength, and respectively generate a first detection signal and a second detection signal;
a first processor, configured to identify whether to generate a wakeup signal according to a standby intensity variation of the first detection signal; and
a second processor, connected to the first processor to receive the wakeup signal, and configured to identify whether to generate a fire alarm according to a first intensity variation of the first detection signal and a second intensity variation of the second detection signal after being woken up by the wakeup signal, wherein
the second processor has an operating capability higher than the first processor.