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
-
申请号: US10960469申请日: 2004-10-07
-
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