| 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, the inclination angles are larger for the faces positioned nearer the light emitting surface ( 42 ), and a difference between the inclination angle of the face ( 46, 49 ) nearest the light emitting surface ( 42 ) and the inclination angle of the face ( 48, 51 ) farthest from the light emitting surface ( 42 ) is 15 degrees or less.
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