公开(公告)号：US20180143413A1

公开(公告)日：2018-05-24

申请号：US15538989

申请日：2015-12-25

Applicant: Nikon Corporation

Inventor： Kensuke UCHIDA ,  Akihiko OBAMA ,  Hiroshi YAMAMOTO ,  Taku MATSUO

IPC: G02B15/20 ,  G02B9/14 ,  G02B13/02

Abstract: A variable magnification optical system includes: a first lens group (G1) having a positive refractive power and arranged closest to an object; a negative lens group (G2) having a negative refractive power and arranged closer to an image than the first lens group; a positive lens group (G4) which has a positive refractive power, which includes at least one lens that is arranged closer to the image than an aperture stop (S), and which is arranged closer to the image than the negative lens group; and a focusing group (G3) arranged between the negative lens group and the positive lens group, wherein when varying magnification, the first lens group moves with respect to an image plane, a distance between the first lens group and the negative lens group is changed, and a distance between the negative lens group and the positive lens group is changed, wherein when focusing, a distance between the focusing group and a lens arranged at a position to face an object-side of the focusing group is changed, and a distance between the focusing group and a lens arranged at a position to face an image-side of the focusing group is changed, and wherein a predetermined conditional expression is satisfied.

公开(公告)号：US20170068074A1

公开(公告)日：2017-03-09

申请号：US15256740

申请日：2016-09-06

Applicant: Nikon Corporation

Inventor： Taku MATSUO ,  Haruo SATO

IPC: G02B15/17 ,  G02B5/00 ,  G02B27/64 ,  G02B27/00

Abstract: The art has, disposed in order from an object, a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, a third lens group (G3) having negative refractive power, and a fourth lens group (G4) having positive refractive power, in which zooming is made by varying an air distance between the first lens group (G1) and the second lens group (G2), and the following conditional expression (1) is satisfied: 0.60

Abstract translation: 本领域具有从物体开始依次布置具有正折光力的第一透镜组（G1），具有负屈光力的第二透镜组（G2），具有负屈光力的第三透镜组（G3）和第四透镜组 具有正屈光力的透镜组（G4），其中通过改变第一透镜组（G1）和第二透镜组（G2）之间的空气距离进行变焦，并满足以下条件表达式（1）：0.60 < f 4 / fw <1.15其中f4表示第四透镜组（G4）的焦距，fw表示在无限远聚焦时在广角端状态下的变焦透镜的焦距。

公开(公告)号：US20230143770A1

公开(公告)日：2023-05-11

申请号：US17917551

申请日：2021-01-12

Applicant: Nikon Corporation

Inventor： Mami MURATANI ,  Taku MATSUO ,  Satoshi MIWA ,  Yoko KOMATSUBARA ,  Akino KONDO

IPC: G02B9/12 ,  G02B13/18

CPC classification number: G02B9/12 ,  G02B13/18

Abstract: An optical system used in an optical apparatus, such as a camera 1, is configured to include a plurality of lens groups such that at focusing the distances between the lens groups are varied, that a final lens group disposed closest to an image side of the lens groups includes at least one lens surface having a pole, and that all of the following conditional expressions are satisfied:


0.020

公开(公告)号：US20180329200A1

公开(公告)日：2018-11-15

申请号：US16029492

申请日：2018-07-06

Applicant: NIKON CORPORATION

Inventor： Taku MATSUO ,  Motohisa MOURI ,  Yukio KUBOTA ,  Takuya SATO

IPC: G02B25/00

CPC classification number: G02B25/001 ,  G02B13/18

Abstract: Provided is an eyepiece optical system including at least three lenses disposed in order from an observation object (Ob) along an optical axis. A final lens disposed closest to an eye point (EP) (corresponds to the third lens (L3) in FIG. 1) is fixed when adjusting the diopter, and the following conditional expressions (1) and (2) are satisfied: 2.2

公开(公告)号：US20180217363A1

公开(公告)日：2018-08-02

申请号：US15539033

申请日：2015-12-25

Applicant: Nikon Corporation

Inventor： Kensuke UCHIDA ,  Akihiko OBAMA ,  Norikazu YOKOI ,  Hiroshi YAMAMOTO ,  Taku MATSUO

IPC: G02B15/20 ,  G02B13/02 ,  G03B5/02

CPC classification number: G02B15/20 ,  G02B13/02 ,  G03B5/02 ,  G03B2205/0046

Abstract: A variable magnification optical system includes: a first lens group having a positive refractive power and arranged closest to an object; a negative lens group having a negative refractive power and arranged closer to an image than the first lens group; a positive lens group which has a positive refractive power, which includes at least one lens that moves integrally with an aperture stop, and which is arranged closer to the image than the negative lens group; and a focusing group arranged between the negative lens group and the positive lens group, wherein when varying magnification, a distance between the first lens group and the negative lens group is changed, and a distance between the negative lens group and the positive lens group is changed, wherein when focusing, a distance between the focusing group and a lens arranged at a position to face an object-side of the focusing group is changed, and a distance between the focusing group and a lens arranged at a position to face an image-side of the focusing group is changed, and wherein a predetermined conditional expression is satisfied.

公开(公告)号：US20180129026A1

公开(公告)日：2018-05-10

申请号：US15539017

申请日：2015-12-25

Applicant: Nikon Corporation

Inventor： Hiroshi YAMAMOTO ,  Taku MATSUO ,  Akihiko OBAMA ,  Kensuke UCHIDA

IPC: G02B15/20 ,  G02B27/64 ,  G02B15/163

CPC classification number: G02B15/20 ,  G02B15/163 ,  G02B15/173 ,  G02B27/646

Abstract: A variable magnification optical system includes: a first lens group having a positive refractive power and arranged closest to an object; a negative lens group having a negative refractive power and arranged closer to an image than the first lens group; and a focusing group arranged between the negative lens group and an aperture stop, wherein when varying magnification, the distance between the first lens group and the negative lens group is changed, and the distance between the negative lens group and the aperture stop is changed, wherein when focusing, the distance between the focusing group and a lens arranged at a position to face an object-side of the focusing group is changed, and the distance between the focusing group and a lens arranged at a position to face an image-side of the focusing group is changed, wherein the focusing group is constituted by one single lens having a positive refractive power, and a predetermined conditional expression is satisfied.