Invention Grant
- Patent Title: Rear projection screen with uniformity of luminance
- Patent Title (中): 背投屏幕亮度均匀
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Application No.: US09922778Application Date: 2001-08-07
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Publication No.: US06597502B2Publication Date: 2003-07-22
- Inventor: Yoshiki Takahashi , Masahiro Goto , Hitomu Watanabe , Makoto Honda , Kumpei Oda , Katsunori Takahashi
- Applicant: Yoshiki Takahashi , Masahiro Goto , Hitomu Watanabe , Makoto Honda , Kumpei Oda , Katsunori Takahashi
- Priority: JP10-40343 19980223
- Main IPC: G03B2160
- IPC: G03B2160

Abstract:
A rear projection screen including a Fresnel lens sheet arranged on the projection side, and a lenticular lens sheet arranged on the observation side. The Fresnel lens sheet has a lenticular lens for vertical diffusion on its light-entering side. The lenticular lens for vertical diffusion contains a plurality of convex lenses that extend horizontally, and these plural convex lenses are arranged with a constant pitch. Further, the diffusion angle of the lenticular lens for vertical diffusion continuously increases, and, at the same time, the direction of diffusion is gradually inclined to the central part side as the distance from the central part toward each of the edges on the screen surface increases. The diffusion properties (the angle and direction of diffusion) of the lenticular lens thus continuously vary between the central part and edges of the screen surface.
Public/Granted literature
- US20010050812A1 Rear projection screen with uniformity of luminance Public/Granted day:2001-12-13
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