发明授权
- 专利标题： Screen and image display apparatus
- 专利标题（中）： 屏幕和图像显示装置
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申请号： US559371申请日： 1990-07-27
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公开(公告)号： US5100222A公开(公告)日： 1992-03-31
- 发明人: Nobuo Minoura , Katsumi Kurematsu , Haruyuki Yanagi , Hideaki Mitsutake
- 申请人： Nobuo Minoura , Katsumi Kurematsu , Haruyuki Yanagi , Hideaki Mitsutake
- 申请人地址： JPX Tokyo
- 专利权人： Canon Kabushiki Kaisha
- 当前专利权人： Canon Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX63-294885 19851122; JPX1-288133 19891106
- 主分类号： G03B21/62
- IPC分类号： G03B21/62
摘要：
A screen is disposed in the position at which an image is formed by an image projector. The screen comprises a transparent sheet having a longitudinal direction and a latitudinal direction, and a fresnel lens surface formed on one surface of the transparent sheet to condense a light beam entered thereinto and emit the condensed light beam, the focal length of the Fresnel lens surface in the longitudinal direction of said transparent sheet being shorter than that in the latitudinal direction of the sheet.
公开/授权文献
- US5648192A Electrophotographic toner 公开/授权日：1997-07-15
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