再颁专利
- 专利标题： Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
- 专利标题（中）： 投影光学系统，放大投影光学系统，放大投影装置和图像投影装置
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申请号： US13973783申请日： 2013-08-22
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公开(公告)号： USRE45728E1公开(公告)日： 2015-10-06
- 发明人: Atsushi Takaura , Kazuhiro Fujita , Nobuo Sakuma
- 申请人： Atsushi Takaura , Kazuhiro Fujita , Nobuo Sakuma
- 申请人地址： JP Tokyo
- 专利权人： RICOH COMPANY, LTD.
- 当前专利权人： RICOH COMPANY, LTD.
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, McClelland, Maier & Neustadt, L.L.P.
- 优先权： JP2003-029595 20030206; JP2003-029602 20030206; JP2003-409304 20031208
- 主分类号： G03B21/14
- IPC分类号： G03B21/14 ; G03B21/20 ; G03B21/28 ; G03B21/26 ; G03B13/22 ; G03B21/56
摘要：
In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.
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