Patent ID: 7985011

Claim:
A vehicle lamp comprising: a light source unit including, a light source including at least one of a point light source and a line light source, a light guide plate transparent to visible light, and including a light emission surface, a first end face facing the light source, a second end face opposite to the first end face, a rear surface, and a prism array adjacent the rear surface, extending with a serrated cross section from the first end face of the light guide plate to the second end face, and extending in a direction parallel with the first end face and including a plurality of prism surfaces, with each of the prism surfaces obliquely formed such that when light enters the light guide plate from the first end face and impinges on the prism surfaces, the light is reflected into small angles of incidence to the light emission surface; a light guide part adjacent an edge of the light guide plate and on a light source side of the light guide plate, the light guide part configured to reflect light from the light guide plate; a reflection sheet configured to reflect light from the light guide plate back into the light guide plate and having a shape configured to provide a cutoff pattern, the reflection sheet located adjacent an edge of the light guide plate adjacent the light source; and a projection lens configured to focus light emitted from the light source unit and to project the same forward in a direction of light illumination, the projection lens including a focus located substantially on the light emission surface.