| 简介 |
PROBLEM TO BE SOLVED : To provide a transmission type screen in which the reflection of external light is little, the contrast of an image is excellent, generation of more is rare, diffusion characteristics are excellent, and manufacturing is easy as a transmission type screen for condensing light projected from an oblique direction.
SOLUTION : Each prism element 12 on the light entering side of the base part 11 of a Fresnel lens part 10 has a refractive surface 12a and a total reflection surface 12b, and is constituted so that the light L1 made incident at a large angle from the oblique direction is refracted and totally reflected to advance in a direction nearly perpendicular to the base part 11. In a diffusing lens part 20, a transparent part 14 has a refractive index N2 smaller than the refractive index N1 of respective fine particles 13, so that the light is refracted by a curved surface forming a boundary between the surface 13a on the light entering side of the particles 13 and the transparent part 14, and is transmitted from an area 13c near a top on the light emitting side of the particles 13 positioned on the surface 16 on the light emitting side of the lens part 20. Then, a light absorption part 15 is formed to cover over an area excepting the area 13c near the top on the light emitting side of the particles 13 out of the surface 13b on the light emitting side of the particles 13. |
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