| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light diffusion plate which efficiently diminishes a lamp image in a simple and easy way and causes no brightness variation. <P>SOLUTION: The light diffusion plate 22 includes an uneven layer 20 for light diffusion and a substrate 21 on which the uneven layer 20 is laid. The uneven layer 20 includes a light incidence surface 20a and a light emission surface 20b which is a surface opposite to the light incidence surface 20a, and on at least one surface of the light incidence surface 20a and the light emission surface 20b, that is, on the light emission surface 20b, a plurality of depressions 201a and a plurality of protrusions 201b with random depths, heights and pitches are continuously formed at random over the whole area of the light emission surface 20b. <P>COPYRIGHT: (C)2010,JPO&INPIT |
