| 发明名称 |
IMAGING LENS |
| 摘要 |
An imaging lens includes a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; and a fourth lens, arranged in this order from an object side to an image plane side. The second lens is arranged to face the third lens. The first lens has a focal length f1 and the fourth lens has an Abbe's number νd4 so that the specific conditional expressions are satisfied. |
| 申请公布号 |
US2017102519(A1) |
申请公布日期 |
2017.04.13 |
| 申请号 |
US201615387860 |
申请日期 |
2016.12.22 |
| 申请人 |
OPTICAL LOGIC INC. ;KANTATSU CO., LTD. |
发明人 |
Kubota Yoji;Kubota Kenichi;Hirano Hitoshi;Yonezawa Tomohiro |
| 分类号 |
G02B13/00;G02B27/00;G02B9/34 |
主分类号 |
G02B13/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An imaging lens comprising:
a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; and a fourth lens, arranged in this order from an object side to an image plane side, wherein said second lens is arranged to face the third lens,and
said first lens has a focal length f1 and said fourth lens has an Abbe's number νd4 so that the following conditional expressions are satisfied:
−75<f1/f<−5.045<νd4<70where f is a focal length of a whole lens system. |
| 地址 |
Nagano JP |
