| 发明名称 |
PROJECTION LENS AND DISPLAY DEVICE FOR MULTIMEDIA AND OTHER SYSTEMS |
| 摘要 |
<p>The present invention relates to a wide-angle projection lens comprising in sequence order from the image side (a) a first lens group (G1) having negative power, (b) a second lens group (G2), and (c) a third lens group (G3) having positive power, and wherein the following inequalities (1) to (4) are satisfied: 1.3 ‰¤ F 1 / F ‰¤ 2.0 F 2 / F ‰¥ 4.0 3.8 ‰¤ F 3 / F ‰¤ 5.0 0.8 ‰¤ BFL / F ‰¤ 1.4
where
F is the focal length of the wide-angle projection lens;
F 1 is the focal length of the first lens group;
F 2 is the focal length of the second lens group;
F 3 is the focal length of the third lens group;
BFL is the back focal length.</p> |
| 申请公布号 |
EP1984769(A4) |
申请公布日期 |
2009.06.24 |
| 申请号 |
EP20070717105 |
申请日期 |
2007.01.30 |
| 申请人 |
3M INNOVATIVE PROPERTIES COMPANY |
发明人 |
LU, KAI CHANG;HUGHES, PATRICIA, M. |
| 分类号 |
G03B21/10;G02B13/06;G02B13/22;H04N5/64;H04N9/31 |
主分类号 |
G03B21/10 |
| 代理机构 |
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代理人 |
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| 主权项 |
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