US 11,867,498 B2
Sprayer comprising detection system for early power-off
Chih-Hao Wang, Hsin-Chu (TW); Yang-Ming Chou, Hsin-Chu (TW); Chien-Yi Kao, Hsin-Chu (TW); Shih-Jen Lu, Hsin-Chu (TW); Chih-Ming Sun, Hsin-Chu (TW); and Hsin-Yi Lin, Hsin-Chu (TW)
Assigned to PixArt Imaging Inc., Hsin-Chu (TW)
Filed by PixArt Imaging Inc., Hsin-Chu (TW)
Filed on Jan. 7, 2021, as Appl. No. 17/144,080.
Claims priority of provisional application 62/963,189, filed on Jan. 20, 2020.
Prior Publication US 2021/0220855 A1, Jul. 22, 2021
Int. Cl. G01B 11/22 (2006.01); B05B 12/08 (2006.01); B05B 12/00 (2018.01); B05B 17/06 (2006.01)
CPC G01B 11/22 (2013.01) [B05B 12/004 (2013.01); B05B 12/081 (2013.01); B05B 17/0676 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A sprayer comprising a detection unit for determining when a liquid level of the sprayer falls below a specific level, the sprayer comprising:
a container arranged to contain a liquid;
a passage comprising a transparent window, a first opening, a second opening and a resonator, wherein when the liquid in the container is passed through the resonator via the first opening, the liquid is emitted as a gas via the second opening; and
a detection unit disposed outside of the passage below the first opening, and comprising:
a light source disposed opposite to the second opening to emit light through the light transparent window for illuminating the gas in the passage such that the gas will reflect the emitted light;
an optical sensor disposed opposite to the second opening to detect a parameter of the reflected light through the transparent window; and
a processor coupled to the optical sensor for stopping the resonator from generating the gas when the parameter of the reflected light is below a first threshold corresponding to the specific level.