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Patent Searching and Data


Title:
OPTICAL SYSTEM, OPTICAL EQUIPMENT, AND OPTICAL SYSTEM MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2019/131992
Kind Code:
A1
Abstract:
Provided are an optical system having superior optical performance, optical equipment having said optical system, and an optical system manufacturing method. This optical system OL has an insertable magnification conversion optical group Gx at a position between an image plane I and an aperture stop S of the optical system OL in order to change the focal length of the optical system OL. The magnification conversion optical group Gx satisfies a condition based on a prescribed conditional expression, and comprises, in order from the object side, an object-side group Gx1 having a positive refractive power and an image-side group Gx2 having a negative refractive power, said groups Gx1, Gx2 being spaced apart by the largest air space among the air spaces in the magnification conversion optical group Gx.

Inventors:
YAMASHITA Masashi (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
WADA Mitsuaki (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
Application Number:
JP2018/048414
Publication Date:
July 04, 2019
Filing Date:
December 28, 2018
Export Citation:
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Assignee:
NIKON CORPORATION (15-3, Konan 2-chome Minato-k, Tokyo 90, 〒1086290, JP)
International Classes:
G02B15/12; G02B15/167
Foreign References:
JPH04324811A1992-11-13
JP2015028555A2015-02-12
JP2018146855A2018-09-20
JP2009036844A2009-02-19
JPS5323645A1978-03-04
JP2009003292A2009-01-08
Attorney, Agent or Firm:
HOSAKA Joyo (SIERRA & CREARE, 9-20-505 Ichibancho, Chiyoda-k, Tokyo 82, 〒1020082, JP)
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