| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively provide a reflection plate allowing a user to sense a bright display picture image visually from a front direction and capable of eliminating changes of colors of the display picture image in accordance with observation positions and reducing the dependency of an angle of incidence of illumination light which becomes display light by combining a Fresnel convex lens allowing penetration light to focus in the direction perpendicular to a main face with a light reflection layer having a diffusive reflection face. SOLUTION: A light reflection layer (reflection plate 1) having a diffusive reflection face is arranged on a rear surface of a Fresnel lens 4. The Fresnel lens 4 and the reflection plate 1 are integrally accumulated in layers. The Fresnel lens 4 used in this embodiment has such characteristic that penetration light forms a focus in the direction perpendicular to a main face when parallel lights enter from an angle in a specific scope in which it is not perpendicular to the main face, and when parallel lights enter at an angle within the specific scope, penetration light is converged at a position of a focal distance in a front direction perpendicular to the main face. Since this Fresnel lens 4 can be simply manufactured by emboss molding and injection molding, it is possible to provide this reflection plate inexpensively. |
