Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE AND IMAGING DEVICE USING SAID VARIABLE MAGNIFICATION OPTICAL SYSTEM, AND MANUFACTURING METHOD OF SAID VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/092294
Kind Code:
A1
Abstract:
This variable magnification optical system ZL comprises, arranged in order from the object side, a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, a third lens group (G3) having positive refractive power, and a subsequent lens group (GR). When changing magnification, the interval between the first lens group (G1) and the second lens group (G2) changes, the interval between the second lens group (G2) and the third lens group (G3) changes, and the interval between the third lens group (G3) and the subsequent lens group (GR) changes, and the subsequent lens group (GR) has a focusing lens group that moves during focusing, and satisfies the following conditional expressions:
0.18 < (-fF)/f1 < 0.30
0.84 < (-f2)/f3 < 1.20,
wherein
fF: the focal length of focusing lens subgroup
f1: the focal length of the first lens group (G1)
f2: the focal length of the second lens group (G2)
f3: the focal length of the third lens group (G3)
More Like This:
| JP5410797 | Zoom lens with anti-vibration function |
| JPH08101340 | ZOOM LENS |
| JP2015141272 | ZOOM LENS AND IMAGING DEVICE HAVING THE SAME |
Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2016/084394
Publication Date:
May 24, 2018
Filing Date:
November 21, 2016
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Domestic Patent References:
| WO2014203572A1 | 2014-12-24 |
Foreign References:
| JP2006251462A | 2006-09-21 | |||
| JP2004317867A | 2004-11-11 | |||
| JP2013117667A | 2013-06-13 | |||
| JP2013235218A | 2013-11-21 | |||
| JP2014219616A | 2014-11-20 | |||
| JP2014178478A | 2014-09-25 | |||
| JP2014138196A | 2014-07-28 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
Download PDF: