| 发明名称 | Zoom lens and image pickup device provided with the same | ||
| 摘要 | A zoom lens includes: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a rear unit having two or more lens units, in the order from an object side to an image side, an interval between the adjacent lens units being changed in order to carry out at least one of zooming and focusing, wherein the rear unit includes a focus lens unit that has a negative refractive power and that moves during the focusing, and wherein, when the zoom lens focuses on a specific object distance, the focus lens unit moves integral with the other lens unit during zooming. | ||
| 申请公布号 | US9274325(B2) | 申请公布日期 | 2016.03.01 |
| 申请号 | US201414200088 | 申请日期 | 2014.03.07 |
| 申请人 | CANON KABUSHIKI KAISHA | 发明人 | Hagiwara Yasuaki |
| 分类号 | G02B15/22;G02B15/14;G02B13/00;G02B15/173 | 主分类号 | G02B15/22 |
| 代理机构 | Carter, DeLuca, Farrell & Schmidt, LLP | 代理人 | Carter, DeLuca, Farrell & Schmidt, LLP |
| 主权项 | 1. A zoom lens comprising: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a rear unit having two or more lens units, in the order from an object side to an image side, an interval between the adjacent lens units being changed in order to carry out at least one of zooming and focusing, wherein the rear unit includes a focus lens unit that has a negative refractive power and that moves during the focusing, wherein, when the zoom lens focuses on a specific object distance, the focus lens unit moves integrally with the other lens units during zooming, and wherein the zoom lens satisfies a conditional expression of 0.3<f2/fn<1.0when a focal length of the second lens unit is defined as f2, and a combined focal length of the rear unit on the wide angle end is defined as fn. | ||
| 地址 | Tokyo JP | ||