发明名称 |
Dichroic prism and projection display apparatus |
摘要 |
The invention provides a dichroic prism capable of reducing displacements of projection pixels of colors caused by chromatic aberration of magnification. A dichroic prism is formed in the shape of a quadrangular prism as a whole by joining four rectangular prisms together. A red reflecting dichroic plane and a blue reflecting dichroic plane intersect to form substantially an X shape along junction surfaces of the prisms. The red reflecting dichroic plane is convex-shaped by partly changing the thickness of an adhesive layer for connecting the rectangular prisms together. Accordingly, since a red beam can be guided to a projection optical system while being enlarged, it is possible to reduce a projection image of the red beam to be projected onto a projection plane via the projection optical system. This makes it possible to reduce relative displacements of projection pixels of color beams caused by chromatic aberration of magnification.
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申请公布号 |
USRE38740(E1) |
申请公布日期 |
2005.06.07 |
申请号 |
US20020163905 |
申请日期 |
2002.06.06 |
申请人 |
SEIKO EPSON CORP |
发明人 |
HASHIZUME TOSHIAKI;YAJIMA AKITAKA |
分类号 |
G02B5/04;G02B27/12;G02B27/14;G02B27/18;G02F1/13;G02F1/1335;G03B33/12;H04N9/07;H04N9/31;(IPC1-7):G02B27/19 |
主分类号 |
G02B5/04 |
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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