发明名称 |
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND PRODUCTION METHOD FOR VARIABLE MAGNIFICATION OPTICAL SYSTEM |
摘要 |
Composing, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having positive refractive power and a fifth lens group; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group, a distance between the second lens group and the third lens group, a distance between the third lens group and the fourth lens group and a distance between the fourth lens group and the fifth lens group being varied, and predetermined conditional expression being satisfied, thereby providing a small-size variable magnification optical system having a high zoom ratio and a high optical performance, an optical apparatus, and a method for manufacturing the variable magnification optical system. |
申请公布号 |
US2015323770(A1) |
申请公布日期 |
2015.11.12 |
申请号 |
US201514700276 |
申请日期 |
2015.04.30 |
申请人 |
NIKON CORPORATION |
发明人 |
SASHIMA Tomoyuki;OBAMA Akihiko |
分类号 |
G02B15/163;G02B27/00 |
主分类号 |
G02B15/163 |
代理机构 |
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代理人 |
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主权项 |
1. A variable magnification optical system comprising, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having positive refractive power; and a fifth lens group;
upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group, a distance between the second lens group and the third lens group, a distance between the third lens group and the fourth lens group and a distance between the fourth lens group and the fifth lens group being varied; the following conditional expressions being satisfied:
0.650<(−f2)/fw<1.2400.410<f3/f4<1.000where fw denotes a focal length of the variable magnification optical system in the wide-angle end state, f2 denotes a focal length of the second lens group, f3 denotes a focal length of the third lens group, and f4 denotes a focal length of the fourth lens group. |
地址 |
Tokyo JP |