| 摘要 |
A light source device comprising a light guide having a first light incident end face and a second light incident end face and a light exit face, a first primary light source and a second primary light source disposed adjacent to the first light incident end face and the second light incident end face, and a light deflection element having a light entry surface disposed to face the light exit face and a light exit surface, wherein a directional light output function unit having an average inclination angle of 0.5-15° is formed on the light exit face of the light guide or on at least one face of the rear surface thereof, a plurality of mutually parallel prism rows extending in parallel to the first and second light incident end faces are formed on the light entry surface of the light deflection element, each prism row has a first prism surface closer to the first primary light source and a second prism surface closer to the second primary light source, the first prism surface has a first area and a second area extending in the extending direction of the prism rows, the apex angle of the prism rows is 80-120° and the difference in inclination angle between the first area and the second area is 5-20° with the inclination angle of the second area being smaller than that of the first area.
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