Invention Grant
- Patent Title: Variable magnification optical system, optical device, and method for manufacturing variable magnification optical system
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Application No.: US16037803Application Date: 2018-07-17
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Publication No.: US11294155B2Publication Date: 2022-04-05
- Inventor: Tomoyuki Sashima , Akihiko Obama
- Applicant: NIKON CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIKON CORPORATION
- Current Assignee: NIKON CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: SGPatents PLLC
- Priority: JP2013-004650 20130115,JP2013-004651 20130115,JP2013-004652 20130115
- Main IPC: G02B15/14
- IPC: G02B15/14 ; G02B27/64

Abstract:
A variable magnification optical system includes, in order from an object side, a first lens group having positive refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group and a distance between the second lens group and the third lens group being varied. The variable magnification optical system further includes a V lens group GV having negative refractive power and being moved to have a component in a direction perpendicular to the optical axis, and an F lens group GF having positive refractive power and being moved along the optical axis upon focusing from an infinitely distant object to a close object, the V lens group GV being disposed on the more object side than the F lens group GF. Thereby, it is possible to provide the compact variable magnification optical system with a high zoom ratio and high performance, an optical apparatus therewith and a method for manufacturing the variable magnification optical system.
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