发明名称 |
Sheet for use for projection screen, light diffusion sheet and projection screen |
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 theta 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-theta)>N2/N1 and N1<1/sin(2theta).
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申请公布号 |
US7180664(B2) |
申请公布日期 |
2007.02.20 |
申请号 |
US20040960469 |
申请日期 |
2004.10.07 |
申请人 |
DAI NIPPON PRINTING CO., LTD. |
发明人 |
GOTO MASAHIRO |
分类号 |
G03B21/56;G02B27/10;G03B21/60;G03B21/62 |
主分类号 |
G03B21/56 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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