发明名称 |
Desk level overhead projector |
摘要 |
A first lens system projects an image onto an optical director which converges the light from the image into a second lens system which reprojects the image onto a screen to be viewed by an audience.
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申请公布号 |
US4156561(A) |
申请公布日期 |
1979.05.29 |
申请号 |
US19660585574 |
申请日期 |
1966.10.10 |
申请人 |
BELL & HOWELL |
发明人 |
LUCAS, JAMES W |
分类号 |
G03B21/132;(IPC1-7):G03B21/28 |
主分类号 |
G03B21/132 |
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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