Patent ID: 6669349
Filing Date: 2003-12-30
Classification: G02B

Abstract:
A beam light source, comprising:a point light source; a beam-shaped light guide including a light incident surface for receiving light emitted from the point light source, a plurality of reflecting surfaces for reflecting light received via the light incident surface in a direction orthogonal to an axial direction of the beam-shaped light guide and opposite to the light incident surface, a light emitting surface, which is orthogonal to the light incident surface, for emitting the light reflected on the reflecting surface, and a side surface opposite to the light emitting surface; a reflecting member having a channel section shape for controlling the light emission direction of light emitted from the beam-shaped light guide; and a scattering reflecting surface, which is formed on at least a channel bottom surface of the reflecting member, for irregularly reflecting light, wherein the light emitting surface of the beam-shaped light guide is arranged so as to face to the channel bottom surface of the reflecting member, light emitted from the light emitting surface of the beam-shaped light guide is irregularly reflected on the scattering reflecting surface on the channel bottom surface to make viewing angle characteristics uniform, is transmitted from the light emitting surface of the beam-shaped light guide through the side surface, and is dispersed and emitted in a form of beam light from the side surface.