| 摘要 |
A light source device, comprising a light guide ( 3 ) having two light incident surfaces opposed to each other for receiving incident light radiated from a primary light source and a light outgoing surface ( 33 ) for emitting the incident light and a light deflection element ( 4 ) disposed adjacent to the light emitting surface side of the light guide, the light deflection element ( 4 ) further comprising a light receiving surface ( 41 ) for receiving incident light and a light emitting surface ( 42 ) positioned on the opposite side thereof and emitting the incident light, wherein a plurality of elongated prisms formed of two prism faces are disposed on the light receiving surface ( 41 ) generally parallel with each other, the prism surfaces are formed of at least two faces ( 46, 47, 48, 49, 50, 51 ) with different inclination angles, and the inclination angles are larger for the faces positioned nearer the light emitting surface ( 42 ). |
