发明申请
- 专利标题： Sheet for use for projection screen, light diffusion sheet and projection screen
- 专利标题（中）： 用于投影屏幕，光扩散板和投影屏幕的纸张
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申请号： US10960469申请日： 2004-10-07
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公开(公告)号： US20050041287A1公开(公告)日： 2005-02-24
- 发明人: Masahiro Goto
- 申请人： Masahiro Goto
- 优先权： JP2001-143219 20010514; JP2001-243272 20010810; JP2001-275031 20010911
- 主分类号： G03B21/62
- IPC分类号： G03B21/62 ; G03B21/60
摘要：
A light diffusion sheet or film including a plurality of unit lenses formed of a material having a refractive index N1, each unit lens having a trapezoidal cross-section. At least one between lens portion, having a triangular cross-section, positioned between two of the unit lenses. The between lens portion is formed of a material having a refractive index N2 that is less than N1. If θ represents an angle defined by a side of the trapezoidal cross-section and a line normal to a base of the trapezoidal cross-section, then sin(90−θ)>N2/N1 and N1