| 发明名称 | Zoom lens and imaging apparatus | ||
| 摘要 | A zoom lens includes: a first lens group having a negative refractive power; and a second lens group having a positive refractive power, provided in this order from an object side. Magnification is changed by moving the first lens group and the second lens group. The first lens group includes a first lens having a negative refractive power, a second lens, a third lens having a negative refractive power, and a fourth lens having a positive refractive power, provided in this order from the object side. The zoom lens satisfies predetermined conditional formulae. | ||
| 申请公布号 | US9013789(B2) | 申请公布日期 | 2015.04.21 |
| 申请号 | US201414176687 | 申请日期 | 2014.02.10 |
| 申请人 | FUJIFILM Corporation | 发明人 | Saito Hiroki;Cho Michio;Ito Toru |
| 分类号 | G02B15/14;G02B15/177;G02B13/00 | 主分类号 | G02B15/14 |
| 代理机构 | Young & Thompson | 代理人 | Young & Thompson |
| 主权项 | 1. A zoom lens consisting essentially of: a first lens group having a negative refractive power; and a second lens group having a positive refractive power, provided in this order from an object side; the first lens group and the second lens group being moved to change magnification; the first lens group substantially consisting of a first lens having a negative refractive power, a second lens, a third lens having a negative refractive power, and a fourth lens having a positive refractive power, in this order from the object side; and the zoom lens satisfying the following conditional formulae: −0.01<fw/fG12<0.06 (1-2)0.37<|fw/f1|<0.51 (2-4) wherein fG12 is the focal length of the second lens from the object side within the first lens group, fw is the focal length of the entire system at a wide angle end, and f1 is the focal length of the first lens group. | ||
| 地址 | Tokyo JP | ||