Patent ID: 8755035

Claim:
A light scanning device comprising: a transparent plate extending across a horizontal direction with a predetermined angle of inclination; and a light output unit, equipped with a light source and a light polarization unit, and being configured to scan a laser light toward an outside of the light scanning device in a horizontal direction through the transparent plate, wherein the light source generates and emits laser light, and the light polarization unit polarizes the laser light emitted from the light source, and the light output unit is further configured to instruct the light polarization unit to rotate a polarization plane of the laser light on the basis of a predetermined angle of inclination of the transparent plate and an azimuth angle in the horizontal direction, where the azimuth angle in the horizontal direction is an angle obtained between an azimuth of the laser light in the horizontal direction and a reference azimuth of the transparent plate, and to output a rotated laser light to the transparent plate in order to scan the rotated laser light to the outside of the light scanning device through the transparent plate.