发明名称 |
DRY ERASABLE PROJECTION ARTICLE AND SYSTEM |
摘要 |
A communication article and system comprising a writing member having a dry erasable front surface and a projection member is disclosed. The projection member includes an asymmetric optical diffuser that scatters light in a first direction with a first viewing angle AH, and in a second direction orthogonal to the first direction with a second viewing angle AV. The ratio AH/AV is at least about 2.
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申请公布号 |
US2010171929(A1) |
申请公布日期 |
2010.07.08 |
申请号 |
US20100684565 |
申请日期 |
2010.01.08 |
申请人 |
3M INNOVATIVE PROPERTIES COMPANY |
发明人 |
LIU YUFENG;HAO ENCAI;YUST DAVID T.;LIU LAN H.;GUSTAFSON FREDERICK J.;BASTIAENS WILLEM V.;YANG YU |
分类号 |
G03B21/60;G03B21/56 |
主分类号 |
G03B21/60 |
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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