US 12,292,546 B2
Raindrop detection device, raindrop detection method, and raindrop detection program
Kohei Fujio, Kyoto (JP); Shinichi Kinoshita, Kyoto (JP); Shingo Kawamoto, Kyoto (JP); and Muneharu Miyakoshi, Kyoto (JP)
Assigned to OMRON CORPORATION, Kyoto (JP)
Filed by OMRON CORPORATION, Kyoto (JP)
Filed on Nov. 18, 2022, as Appl. No. 18/056,735.
Claims priority of application No. 2021-214764 (JP), filed on Dec. 28, 2021.
Prior Publication US 2023/0204818 A1, Jun. 29, 2023
Int. Cl. G01W 1/14 (2006.01); G01N 21/59 (2006.01)
CPC G01W 1/14 (2013.01) [G01N 21/59 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A raindrop detection device, comprising:
a light source unit configured to emit light in a specific direction;
a light receiving unit that is disposed at a position opposite the light source unit and configured to receive the light emitted from the light source unit;
a raindrop detection unit configured to detect raindrops that have passed between the light source unit and the light receiving unit according to a change in an amount of light received by the light receiving unit; and
a control unit configured to control on and off switching of the light emitted from the light source unit, wherein
the control unit performs control so as to repeatedly turn the light source unit on and off, and
the light receiving unit has a difference output unit configured to output a difference in the amount of light received when the light source unit is lit and when the light source unit is unlit, as a voltage.