发明名称 |
Fresnel lens and projection display device using one such lens |
摘要 |
A Fresnel lens comprises at least one first prism and one second prism. Each prism has a first side and a second side which forms with a main axis an angle greater than that formed by the first side and the main axis. Conventionally, the second side of the first prism collimates the light received from a light source in line with the main axis. In order to improve the optical effectiveness, the second side of the second prism transmits the light received from the source in a first direction slightly different from the main axis.
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申请公布号 |
US8009354(B2) |
申请公布日期 |
2011.08.30 |
申请号 |
US20050585652 |
申请日期 |
2005.01.07 |
申请人 |
THOMSON LICENSING |
发明人 |
SCHUBERT ARNO;BENOIT PASCAL |
分类号 |
G03B21/56;G02B3/08;G03B21/62;H04N5/74 |
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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