| 摘要 |
PROBLEM TO BE SOLVED: To obtain a transmission type screen constituted by sticking a plurality of lens screens so that lens parts may face to each other, wherein their lens shape is restrained from being damaged under abnormal environment caused by temperature change. SOLUTION: In the transmission type screen, a diffusion sheet having a microlens part constituted by two-dimensionally arranging unit convex lenses nearly in a matrix, and a Fresnel lens sheet having a lens part comprising a Fresnel lens are arranged so that their lens parts may face to each other, and their peripheral parts are fixed. The lens part of the diffusion sheet has the microlens part constituted by two-dimensionally arranging the unit convex lenses nearly in the matrix, and further the occupancy ratio of the microlens group per unit volume is≤25%. COPYRIGHT: (C)2007,JPO&INPIT
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