| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light deflection element, controlling the distribution of outgoing light to a very small width to improve the utilization of quantity of light of a primary light source, and easily improving the image quality in a simplified constitution. <P>SOLUTION: This light deflection element 4 has a light incoming surface 41 where the light enters and a light outgoing surface 42 located on the opposite side to emit the entering light. In the light incoming surface 41, a plurality of prism strings formed of two prism surfaces 44, 45 are arranged substantially in parallel to each other. At least one of the prism surfaces 45 of the prism strings consists of at least two convex surfaces 53, 54 having different inclination angles, and the closer the convex surface 54 is located to the light outgoing surface 42, the larger the angle of inclination is. <P>COPYRIGHT: (C)2009,JPO&INPIT |
