US Patent 10054841 Optical device, lidar device and imaging device

An optical device includes: a casing having a waterproof structure; a light transmission part provided in the casing; an air blow port for blowing air onto the light transmission part; a flow path for causing the air to flow to the air blow port, the flow path being provided to maintain the waterproof structure of the casing; an air intake port through which the air flows into the flow path; a blower part generating the flow of the air from the air intake port to the air blow port; and an observation unit accommodated in the casing to receive light from the outside via the light transmission part.