| 摘要 |
PROBLEM TO BE SOLVED: To provide a screen for rear projectors that emits incident light within a fixed angle nearly telecentrically, can nearly vertically set the maximum luminance direction of a screen to the screen, and enables brighter observation having a small amount of nonuniformity. SOLUTION: A lens unit 4 has an incidence side lens surface 2 and an emission side lens surface 3 arranged at the back side in the order of an optical path. A plurality of lens units 4 are arranged in parallel so that the incidence side lens surfaces 2 and emission side lens surfaces 3 are mutually adjacent in a direction vertical to an optical axis and an expression of 90°<ψ+θ<SB>2</SB><110°should be met. In this case,ψis set to be an angle formed by a tangential line on a surface at the outermost end of the emission side lens surface 3 and the normal of a lenticular screen, andθ<SB>2</SB>is set to be an angle formed by the most off-axis main light beam 7 and the normal of the outermost end of the emission side lens surface 3 when the most off-axis main light beam 7 is emitted from the emission side lens surface 3. COPYRIGHT: (C)2005,JPO&NCIPI
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