发明授权
- 专利标题： Projection optical unit, projection-type image displaying apparatus and projection-type image displaying system
- 专利标题（中）： 投影光学单元，投影型图像显示装置和投影型图像显示系统
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申请号： US12838915申请日： 2010-07-19
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公开(公告)号： US07857462B2公开(公告)日： 2010-12-28
- 发明人: Takanori Hisada , Koji Hirata , Masahiko Yatsu
- 申请人： Takanori Hisada , Koji Hirata , Masahiko Yatsu
- 申请人地址： JP Tokyo
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Antonelli, Terry, Stout & Kraus, LLP.
- 优先权： JP2007-225870 20070831
- 主分类号： G03B21/14
- IPC分类号： G03B21/14 ; G03B21/28
摘要：
A projection optical unit for a projection display apparatus, which displays an image upon a projection surface, obliquely, includes a front lens group disposed in a direction from an image display element to a projection surface, a rear lens group, and a reflection mirror formed so that a curvature of a portion for reflecting a light beam incident upon a lower end portion of the projection surface is larger than a curvature of a portion for reflecting a light beam incident upon an upper end of the projection surface. An optical axis of the front lens group and the rear lens group is more inclined with respect to a direction of the portion of the reflection mirror for reflecting the light beam incident upon the lower end portion of the projection surface than a normal line direction of the image display element.
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