| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem wherein it is difficult to carry out homogeneous illumination because an asymmetric characteristic of illumination light intensity distribution becomes large, owing to a large partiality of the light amount on one side of a light guiding plate, in the case of carrying out illumination by arranging a light pipe in a side-light type from one side of the light guide plate. <P>SOLUTION: In an illumination device having the light guide and a circulation type light pipe of a rectangular circular shape to uniformly irradiate by emitted light from a light source to a side face of the light guide plate by circulation wave guiding, prism group or minute dispersion structural body group are nearly point-symmetrically formed on at least on one face of two planes perpendicular to the incident side face from the circulation type light pipe to the light guide plate. Furthermore, minute dot patterns are formed together with these minute prism group and the minute dispersion structural bodies. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
