| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-accuracy, thin optical screen reducing the light loss of incident light, used for a projection television or the like; to provide a projection screen used with the combination of the optical screen and a fresnel lens sheet; and to provide a method for manufacturing the optical screen. SOLUTION: In the optical screen constituted of a microlens array obtained by arraying unit lenses on a light transmissive plastic substrate, the unit lens has a shape of a micro concentric fresnel lens whose curved surface shape is controlled. COPYRIGHT: (C)2007,JPO&INPIT
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