发明授权
US07467872B2 Projection optical unit and projection type video display device using the unit
有权
投影光学单元和投影型视频显示设备使用该单元
- 专利标题： Projection optical unit and projection type video display device using the unit
- 专利标题（中）： 投影光学单元和投影型视频显示设备使用该单元
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申请号： US11258384申请日： 2005-10-26
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公开(公告)号： US07467872B2公开(公告)日： 2008-12-23
- 发明人: Takanori Hisada , Hiroki Yoshikawa , Tetsu Ohishi , Masahiko Yatsu , Koji Hirata
- 申请人： Takanori Hisada , Hiroki Yoshikawa , Tetsu Ohishi , Masahiko Yatsu , Koji Hirata
- 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： McDermott Will & Emery LLP
- 优先权： JP2005-111517 20050408
- 主分类号： G03B21/22
- IPC分类号： G03B21/22
摘要：
In the image display device, a projection lens including a plurality of lenses for enlarging an image from an image display element is constituted of a front group and a rear group. The rear group includes at least one free-shaped-surface lens including a surface having a rotationally asymmetrical shape. Furthermore, the device includes at least one free-shaped-surface mirror having a rotationally asymmetrical reflection surface. Accordingly, a set can be formed to be compact while correcting trapezoidal distortion and aberration.
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