Title:
変倍光学系および光学機器
Document Type and Number:
Japanese Patent JP7014253
Kind Code:
B2
Abstract:
A zoom optical system (ZL) comprises: a first lens group (G1) disposed closest to an object and having a positive refractive power; an aperture stop (S) disposed closer to an image than the first lens group (G1); a positive lens component disposed so as to oppose the image side of the aperture stop (S); and a lens group (G3) having the positive lens component, wherein a distance between the first lens group (G1) and the lens group (G3) having the positive lens component changes during zooming, at least one lens surface of the positive lens component has an aspherical surface, and the following conditional expression, 0.40
Inventors:
Takeshi Umeda
Tomoki Ito
Atsushi Shibayama
Tomoki Ito
Atsushi Shibayama
Application Number:
JP2020060806A
Publication Date:
February 01, 2022
Filing Date:
March 30, 2020
Export Citation:
Assignee:
NIKON CORPORATION
International Classes:
G02B15/20; G02B13/18
Domestic Patent References:
JP201564492A | ||||
JP201283601A | ||||
JP201572369A | ||||
JP2011186417A |
Foreign References:
WO2018066648A1 |
Attorney, Agent or Firm:
Shogo Onishi
Toshiaki Namiki
Toshiaki Namiki
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