发明名称 |
OBLIQUE PROJECTION OPTICAL SYSTEM AND PROJECTION TYPE DISPLAY APPARATUS USING THE SAME |
摘要 |
A projection type display apparatus including an oblique projection optical system having a plurality of lenses is disclosed. A lens nearest to a projection screen has a vertical effective image area through which a light flux passes. The lens is arranged at a position not including an optical axis shared by the largest number of lenses among the plurality of lenses. A flat mirror for returning the optical path is arranged between the particular lens and the projection screen at a predetermined angle to the optical axis. An enlarged image obtained by the light flux returned by the flat mirror is formed toward a display screen. |
申请公布号 |
US2014146294(A1) |
申请公布日期 |
2014.05.29 |
申请号 |
US201414168606 |
申请日期 |
2014.01.30 |
申请人 |
HITACHI CONSUMER ELECTRONICS CO., LTD. |
发明人 |
HIRATA KOJI;YATSU MASAHIKO;OGURA NAOYUKI |
分类号 |
G03B21/28;G02B13/18;G03B21/14 |
主分类号 |
G03B21/28 |
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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