| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light control sheet which raises luminance of a surface light source device and in which a failure hardly occurs during production. <P>SOLUTION: The light control sheet comprises a large number of projected strip-shaped lenses arranged in parallel to each other on a light emission surface of a light translucent base material. The projected strip-shaped lenses are constituted of a first surface to a seventh surface in turn from one peripheral part of the lenses. The first surface 31, the third surface 33, the fifth surface 35 and the seventh surface 37 are formed of a curved surface, the second surface 32 and the sixth surface 36 are formed of a plane and the fourth surface 34 is formed of a curved surface or the plane. At a light incident surface side of the light control sheet, a light transmission part is formed in a light condensing area and a light reflection part is formed in an area except the light condensing area when parallel light is made incident in a direction vertical to the light incident surface to the projected stripe-shaped lenses. <P>COPYRIGHT: (C)2010,JPO&INPIT |
