| 摘要 |
The inventions seeks to eliminate ghosts caused by retroreflection of projected light and obtain high resolution images. Fine irregularities 5 are randomly formed on the plane of incidence 2a of a Fresnel lens sheet 2 with little space between them. The glossiness (Gs 60 DEG ) of the fine irregularities 5 formed by such a random pattern is equal or less than 35%. The fine irregularities 5 are in a semispherical shape, the level difference is about 10 mu m, and the maximum diameter is about 50 mu m. Projected light L is scattered by the fine irregularities 5 at the plane of incidence 2a, subjected to vector resolution, and has its optical intensity weakened, so that retroreflection light can be prevented. <IMAGE> |
