| 摘要 |
<p>A lenticular lens sheet capable of reducing the color shift and improving the overall light beam transmittance. The lenticular lens sheet has an incident side lenticular lens on its light beam incident side surface and further has an emergent side lenticular lens on its emergent side surface, with peak portions of the emergent side lenticular lens being formed at substantially convergent positions of the incident side lenticular lens. When an inter-lens distance at the sheet central portion is taken to be t0 and an inter-lens distance of an end portion of an viewable area of a rear-projection screen composed of this lenticular lens sheet is taken as t1, the rate of the inter-lens distances t0 and t1 is determined to satisfy 0.98 ≤ t1/t0 ≤ 1.10. The lenticular lens sheet has a thickness which may vary in a direction perpendicular to the lens longitudinal direction, from the sheet center to the sheet edge sides. In order to compensate for the non-uniform thickness distribution of the sheet, the incident side lenticular lenses have a gradually increasing or decreasing radius of curvature, such that the local lines are always substantially located on the apexes of the emitting side lenses.</p> |
