| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a condensing sheet which can condense light made incident at various angles from a light source within an objective emission half-value angle. <P>SOLUTION: The condensing sheet includes: transmission parts 112 with light transparency having unit shapes in which the cross-sectional shape in a direction orthogonal to the sheet face is almost trapezoidal shape, and in which, with the upper bottom parts of the trapezoids as incidence planes 112a and the lower bottom parts of the trapezoids as emission planes 112b, the plurality of unit shapes are arranged in parallel to the sheet face direction; and reflection pats 113 as the parts provided among the unit shapes of the transmission parts 112 which reflect light not incident on the incidence planes 112a. The reflection parts 113 are made of a stock having a refractive index lower than that of the transmission parts 112 as the base, reflection beads 114 reflecting light are mixed into the stock having a low refractive index, and boundary parts 113b between the transmission parts 112 and the reflection parts 113 reflect light made incident on the incidence planes 112a and emitting on the boundary parts 113b to the emission planes 112b, so as to condense the emitted light within an objective emission half-value angle. <P>COPYRIGHT: (C)2010,JPO&INPIT |
