Patent ID: 6997565

Claim:
A lamp comprising: an illuminant section having an illuminant for radiating light, the light having a size determined by an arc length, wherein the arc length has a direction intersecting an optical axis of the lamp; a lamp reflector having a focus located at a center point of the illuminant, in the illuminant section, for reflecting, light radiated from the center point of the illuminant section, and a surface of revolution developed around the optical axis and directed toward a forward direction of the optical axis; and a lamp front glass perpendicular to the optical axis and having an incident surface and an outgoing surface, receiving the light flux from the lamp reflector through the incident surface and outputting a parallel light flux through the outgoing surface, wherein the surface of revolution of the lamp reflector is a deformation of an aspherical reflection surface rotationally symmetrical with respect to the optical axis, the aspherical reflection surface including a plurality of infinitesimal mirrors oriented at respective radiation angles with respect to the light from the illuminant section, each infinitesimal mirror is arranged on the surface of revolution to reflect a light ray, within an effective light reflecting area of the lamp reflector and radiated from the illuminant section, in a corresponding constant infinitesimal angle dθ along the forward direction of the optical axis so that the light rays reflected by the corresponding infinitesimal mirror intersect the lamp front glass along a corresponding constant infinitesimal length dr on a line perpendicular to the optical axis, and all of the light rays radiated from the center point of the illuminant section and reflected by the lamp reflector propagate as the parallel light flux at the outgoing surface of the lamp front glass, dr/dθ is constant for all of the lamp reflector, at least one of the incident surface and the outgoing surface of the lamp front glass is a deformation of an aspherical lens surface rotationally symmetrical with respect to the optical axis, and distribution of a divergence angle of the light flux at the outgoing plane of the lamp front glass is constant with respect to distance perpendicular to the optical axis.