Patent ID: 7178922

Claim:
A lamp comprising: an illuminant section having an illuminant for radiating light having a size determined by an arc length and direction of the arc length along an optical axis of the lamp, the illuminant having a center point; a lamp reflector for condensing light flux emitted from a center point of the illuminant, the reflector being a surface of revolution about the optical axis, and the center point of the illuminant being located at a focus of the lamp reflector and on the optical axis; and a lamp front glass having a substantially planar incident surface and a substantially planar outgoing surface, for receiving the light flux reflected by the lamp reflector through the incident surface and outputting the light flux through the outgoing surface, wherein the surface of revolution of the lamp reflector is a deformed aspherical reflection surface, a deformed aspherical lens having a substantially planar rear surface and a deformed aspherical lens front surface which has a rotational symmetry about the optical axis and largest thickness, measured parallel to the optical axis, at a position spaced from the optical axis and spaced from a peripheral edge of the deformed aspherical lens front surface, the substantially planar rear surface of the deformed aspherical lens being disposed on at least one of the incident surface and the outgoing surface of the lamp front glass, after the light flux radiated by the illuminant is reflected by the lamp reflector, within an effective light receiving area of the lamp reflector, divergence angles of light rays proximate the optical axis on the outgoing surface of the lamp front glass are smaller than divergence angles of the light rays passing through the outgoing surface of the lamp front glass and remote from the optical axis due to shapes of the aspherical reflection surface and the deformed aspherical lens, and a different power for each radiation direction is applied by the aspherical reflection surface and the deformed aspherical lens, suppressing distribution of divergence angles of the light flux at the outgoing surface of the lamp front glass.