发明名称 |
Projection optical unit and projection type video display device using the unit |
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.
|
申请公布号 |
US2006227299(A1) |
申请公布日期 |
2006.10.12 |
申请号 |
US20050258384 |
申请日期 |
2005.10.26 |
申请人 |
HISADA TAKANORI;YOSHIKAWA HIROKI;OHISHI TETSU;YATSU MASAHIKO;HIRATA KOJI |
发明人 |
HISADA TAKANORI;YOSHIKAWA HIROKI;OHISHI TETSU;YATSU MASAHIKO;HIRATA KOJI |
分类号 |
G03B21/28 |
主分类号 |
G03B21/28 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|