| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reflective screen that improves contrast reduction due to reflection of external light and prevents gain reduction. <P>SOLUTION: A reflective screen 1 comprises a resin sheet 2, a light absorption layer 4, a light reflection layer 5 and a low refractive index layer 6. The resin sheet 2 has translucency, and includes a stripe convex part 3 that is cyclically formed with a width of a pitch P on one side of its principal plane. The low refractive index layer 6 is arranged on the other side of the principal plane, and has a refractive index lower than the resin sheet 2 by 0.15 or more. The light absorption layer 4 is arranged alternately with the low refractive index layer 6 in a manner opposite to the convex part 3, so as to be parallel to the stripe shape of the convex part 3. The light reflection layer 5 is arranged opposite to an interface between the low refractive index layer 6 and the resin sheet 2 across the low refractive index layer 6, and has a diffuse reflectance characteristic. The convex part 3 has an arc-shaped cross section perpendicular to a longer direction. A normal direction of the interface between the low refractive index layer 6 and the resin sheet 2 tilts to the normal direction of the principal plane, and one set of the light absorption layer 4 and the low refractive index layer 6 is arranged with the width approximately the same as the pitch P. <P>COPYRIGHT: (C)2013,JPO&INPIT |
