| 发明名称 | Imaging lens | ||
| 摘要 | An imaging lens includes a first lens having negative refractive power; a second lens; a third lens; a fourth lens having positive refractive power; and a fifth lens. The second lens has a surface on the object side formed in an aspheric shape. The first to fifth lenses are formed of materials having specific Abbe's numbers to satisfy specific conditions. | ||
| 申请公布号 | US9529178(B2) | 申请公布日期 | 2016.12.27 |
| 申请号 | US201514687184 | 申请日期 | 2015.04.15 |
| 申请人 | OPTICAL LOGIC INC.;KANTATSU CO., LTD. | 发明人 | Kubota Yoji;Kubota Kenichi;Hirano Hitoshi;Yonezawa Tomohiro |
| 分类号 | G02B9/60;G02B13/04;G02B3/02;G02B13/00;G02B3/04;G02B13/06;G02B27/00 | 主分类号 | G02B9/60 |
| 代理机构 | Kubotera & Associates, LLC | 代理人 | Kubotera & Associates, LLC |
| 主权项 | 1. An imaging lens comprising: a first lens having negative refractive power; a second lens; a third lens; a fourth lens; and a fifth lens, arranged in this order from an object side to an image plane side, wherein said second lens has a surface on the object side formed into an aspheric shape, said first lens, said second lens, said third lens, and said fourth lens are formed of a material having an Abbe's number between 45 and 75, said fifth lens is formed of a material having an Abbe's number between 20 and 40, and said first lens has a focal length f1 so that the following conditional expression is satisfied: −3.5<f1/f<−1.5where f is a focal length of a whole lens system. | ||
| 地址 | Nagano JP | ||