Title:
OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/039912
Kind Code:
A1
Abstract:
It is possible to provided a large-aperture microlens capable of excellently correcting various aberrations and controlling blurring of a defocused image, since the microlens comprises a first lens group having a positive refractive power and a plurality of subsequent lens groups sequentially from the object side, wherein the interval between the adjacent lens groups changes during focusing, the first lens group comprises a front lens group having a positive refractive power and disposed on the object side and comprises, across an aperture diaphragm, a rear lens group having a positive refractive power and disposed on the image side, the front lens group moves to the object side during focusing from an infinite-distance object to a close-distance object, and the rear lens group satisfies a prescribed conditional expression.
Inventors:
HARADA HIROKI (JP)
Application Number:
PCT/JP2019/030872
Publication Date:
February 27, 2020
Filing Date:
August 06, 2019
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B13/00
Foreign References:
| JPH11281892A | 1999-10-15 | |||
| JP2000089113A | 2000-03-31 | |||
| JP2012185263A | 2012-09-27 | |||
| JP2013250294A | 2013-12-12 | |||
| JPH09218346A | 1997-08-19 | |||
| JP2010145830A | 2010-07-01 | |||
| JP2013104994A | 2013-05-30 | |||
| JPS56107210A | 1981-08-26 | |||
| JP2013238827A | 2013-11-28 |
Attorney, Agent or Firm:
INOUE & CO. et al. (JP)
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