| 摘要 |
PROBLEM TO BE SOLVED: To provide a raindrop detector capable of reducing the difference between a first optical path and a second optical path in the intensity of light radiated to a wind shield.SOLUTION: A lens part 140 has an incident-side concave surface 141; an incident-side reflection surface 142; and an incident-side lens surface 143. The incident-side concave surface 141 is recessed to be away from a light-emitting part 110, and guides light emitted to a side opposite to a light-receiving part 120 out of the light emitted from the light-emitting part 110 into the lens part 140 while maintaining the straightness of the light. The incident-side reflection surface 142 reflects and collimates the light guided into the lens part 140 via the incident-side concave surface 141, and guides the light to an outer surface 210 of a wind shield 200. The incident-side lens surface 143 guides the light emitted to the light-receiving part 120 out of the light emitted from the light-emitting part 110 into the lens part 140, collimates the light, and guides the light to the outer surface 210 of the wind shield 200.SELECTED DRAWING: Figure 1 |
