Title:
VARIABLE-MAGNIFICATION OPTICAL SYSTEM AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/085142
Kind Code:
A1
Abstract:
This variable-magnification optical system comprises, in order along an optical path from the object side, a first group that has positive power, a second group that has positive power, a third group that has negative power, a diaphragm, a fourth group that has positive power, and a fifth group that has positive power. The first group is provided with two mirrors. An intermediate image is formed in the optical path between the first group and the second group. The second group, the third group, and the fourth group are dioptric systems. For variable magnification, the two mirrors of the first group, the second group, the diaphragm, and the fifth group are immobile, the third group moves toward the image side, and the fourth group moves toward the object side.
Inventors:
TOMIOKA UKYO (JP)
Application Number:
PCT/JP2020/038809
Publication Date:
May 06, 2021
Filing Date:
October 14, 2020
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
G02B17/08; G02B15/167
Foreign References:
| JP2019148791A | 2019-09-05 | |||
| JPH11202208A | 1999-07-30 | |||
| JP2017187640A | 2017-10-12 | |||
| US4971428A | 1990-11-20 | |||
| US20050259330A1 | 2005-11-24 |
Attorney, Agent or Firm:
TAIYO, NAKAJIMA & KATO (JP)
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