发明名称 |
Projector with adjustably positioned image plate |
摘要 |
A projector is often positioned so that its optical axis is at an imperfect orthogonal angle with respect to a projection screen. This position causes a keystone distortion as well as imperfect focus in the projected image. To correct these undesirable problems, initially, a lens and/or an image-forming plate is independently repositioned to bring the projected image into focus based upon user input data. The keystone distortion is also corrected by redrawing the image on an image-forming surface based upon additional user input data.
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申请公布号 |
US6361171(B1) |
申请公布日期 |
2002.03.26 |
申请号 |
US20000493334 |
申请日期 |
2000.01.28 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
EJIRI KOICHI;YAMAGUCHI TAKAO;AOKI SHIN;GUAN HAIKE |
分类号 |
H04N5/74;G02B27/18;G03B21/00;G03B21/14;G03B21/28;H04N17/00;H04N17/04;(IPC1-7):G03B21/14;G02F1/133;G02F1/03;H04N5/64 |
主分类号 |
H04N5/74 |
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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