| 发明名称 | Zoom lens and image pickup apparatus using the same | ||
| 摘要 | 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. Each distance between the first lens unit and the second lens unit, between the third lens unit and the fourth lens unit, and between the fourth lens unit and the fourth lens unit at the telephoto end is longer than at the wide angle end, and a distance between the second lens unit and the third lens unit at the telephoto end is shorter than at the wide angle end, and the following conditional expressions are satisfied. 2<mg3t/mg3w<61.2<mg5t/mg5w<40.02<f5/ft<0.12 | ||
| 申请公布号 | US9383558(B2) | 申请公布日期 | 2016.07.05 |
| 申请号 | US201514837504 | 申请日期 | 2015.08.27 |
| 申请人 | Olympus Corporation | 发明人 | Morooka Masaru;Kon Toyoki;Imamura Masahiro;Ueda Minoru |
| 分类号 | G02B9/60;G02B15/16;G02B27/64;H04N5/232;G02B15/173;G02B13/00 | 主分类号 | G02B9/60 |
| 代理机构 | Kenyon & Kenyon LLP | 代理人 | Kenyon & Kenyon LLP |
| 主权项 | 1. A zoom lens comprising in order from an object side to an image side: 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; a fourth lens unit having a negative refractive power; and a fifth lens unit having a positive refractive power, wherein at the time of zooming, each of the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit moves to change distances between the lens units,a distance between the first lens unit and the second lens unit at a telephoto end is longer than a distance between the first lens unit and the second lens unit at a wide angle end,a distance between the third lens unit and the fourth lens unit at the telephoto end is longer than a distance between the third lens unit and the fourth lens unit at the wide angle end,a distance between the fourth lens unit and the fifth lens unit at the telephoto end is longer than a distance between the fourth lens unit and the fifth lens unit at the wide angle end,a distance between the second lens unit and the third lens unit at the telephoto end is shorter than a distance between the second lens unit and the third lens unit at the wide angle end, and the following conditional expression (11) is satisfied: 40<ft/fw<150 (11) where, ft denotes the focal length of the overall zoom lens system at the telephoto end, and fw denotes a focal length of the overall zoom lens system at a wide angle end. | ||
| 地址 | Tokyo JP | ||