摘要 |
A light source device comprising at least a primary light source ( 1 ), a light guide ( 3 ) guiding light beamed from the primary light source and having a light incident surface ( 31 ) and a light outgoing surface ( 33 ), an optical deflector ( 4 ) disposed adjacent to the light guide's light outgoing surface and having a light incident surface ( 41 ) and a light outgoing surface ( 42 ), and a light diffuser ( 6 ) disposed adjacent to the optical deflector's light outgoing surface and having a light incident surface ( 61 ) and a light out going surface ( 62 ), wherein the optical deflector's light incident surface is formed with a plurality of rows of prisms arranged in parallel to each other, and the light diffuser has the full width half maximum of an outgoing light intensity of 1-13 degrees when parallel rays of light are incident, whereby providing a light source device excellent in light utilization efficiency of a primary light source, and also excellent in viewing angle characteristics and quality as an image forming illumination without sacrificing high brightness characteristics.
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