Patent ID: 8109663

Claim:
A vehicular lamp comprising a light source, a reflector, a shade, and a projector lens, wherein light emitted from the light source is reflected by the reflector, the light is partially blocked by the shade, the light not blocked is transmitted through the projector lens, and an object ahead a vehicle is irradiated with the light, a diffraction grating is provided in a region including an end portion of a light passing region of at least one surface in the projector lens in order to reduce color separation, and magnitude of f D /f/Abbe and a position of the shade on an optical axis are determined according to a correlated color temperature of the light source so as to reduce the color separation caused by a characteristic of the light source, where f is a focal distance of the projector lens, the focal distance of the projector lens being determined by a marginal ray passing through the end portion, f D is a focal distance caused by a grating pitch of a diffraction surface, the focal distance caused by the grating pitch being determined by the marginal ray passing through the end portion, and Abbe is an Abbe number.