| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light control sheet capable of performing even and uniform illumination irrespective of the position of observing a screen, and to provide a surface light source device having the light control sheet. <P>SOLUTION: Refection parts 142-1 are disposed on the incident side of a lenticular lens sheet 14-1 on which a large number of unit lenses 141-1 protruding to the emission side are arranged in parallel, so as to occupy an area ratio from 30% to 50%. Thereby, light emitted to unnecessary directions is returned to the light source side, can be reused and, therefore, light emitted to necessary directions is allowed to increase. Accordingly, illumination without brightness unevenness can be provided in the state of high utilization efficiency of light and the uniform and bright illumination light can be obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT |
