Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/181903
Kind Code:
A1
Abstract:
Provided is a small-size and lightweight variable magnification optical system suitable for moving image photography and capable of obtaining excellent optical performance, an optical device, and a method for manufacturing the variable magnification optical system. A variable magnification optical system ZL for use in an optical device such as a camera 1 includes, in order from the object side: a first lens group G1 having negative refractive power; a second lens group G2 having positive refractive power; a third lens group G3; and a fourth lens group G4 having positive refractive power. During zooming, the distance between adjacent lens groups changes, the first lens group G1 is fixed with respect to the image plane, and the fourth lens group G4 moves along the optical axis. During focusing, at least the second lens group G2 moves along the optical axis and satisfies a condition represented by a predetermined conditional expression.
Inventors:
SASHIMA TOMOYUKI (JP)
SAITO YUMA (JP)
SAITO YUMA (JP)
Application Number:
PCT/JP2023/008475
Publication Date:
September 28, 2023
Filing Date:
March 07, 2023
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18
Foreign References:
| JPH09152552A | 1997-06-10 | |||
| JPH1048521A | 1998-02-20 | |||
| JP2009162809A | 2009-07-23 | |||
| JP2007183664A | 2007-07-19 | |||
| JP2004069808A | 2004-03-04 |
Attorney, Agent or Firm:
HOSAKA Joyo (JP)
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