发明名称 |
PROJECTION SCREEN APPARATUS FOR USE WITH PORTABLE DIGITAL PROJECTORS |
摘要 |
Projection screen apparatuses that comprise at least a first and a second projection screen member having different optical properties are described. These screen members can be adapted to connect to each other to form a self-supporting structure in which the first projection screen member is oriented in a viewing position and the second projection screen member is oriented in a support position.
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申请公布号 |
US2008158669(A1) |
申请公布日期 |
2008.07.03 |
申请号 |
US20060618356 |
申请日期 |
2006.12.29 |
申请人 |
3M INNOVATIVE PROPERTIES COMPANY |
发明人 |
O'KEEFE MICHAEL W.;DUNCAN JOHN E. |
分类号 |
G03B21/56 |
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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