| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a plane light source device using a point light source easy to manufacture, capable of emitting plane light with uniform distribution of brightness, and simply controlling light pass. <P>SOLUTION: An LED element 1 as a point light source is arranged so as to face a light-emitting surface 2a of a wedge-shaped transparent light guide body 2. A light guide plate 5 is arranged at the light emitting surface 2b side of the wedge-shaped transparent light guide body 2 through a prism array as a light deflection element. Out of a pair of main surfaces of the light guide plate 5, one surface serves as a light-emitting surface 5b, and a light path control pattern P, reflecting the light incident on the light incident surface 5a in the direction normal to the light-emitting surface 5b, is formed on a main surface 5c at the opposite side. The light path control pattern P is composed of a plurality of ridge-shaped parts 5c1 extending in the longitudinal direction of the light incident surface 5a of the light guide plate. <P>COPYRIGHT: (C)2004,JPO |
