公开(公告)号：US20210382285A1

公开(公告)日：2021-12-09

申请号：US17406070

申请日：2021-08-18

Applicant: Nikon Corporation

Inventor： Kosuke MACHIDA

IPC: G02B15/14 ,  G02B13/18 ,  G02B15/163 ,  G02B15/177

Abstract: A variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a first intermediate lens group having positive refractive power, a second intermediate lens group having negative refractive power and a rear lens group; upon varying a magnification from a wide angle end state to a telephoto end state, a distance between the first lens group and the first intermediate lens group being varied, a distance between the first intermediate lens group and the second intermediate lens group being varied, and a distance between the second intermediate lens group and the rear lens group being varied; the rear lens group comprising at least one focusing lens group which is moved upon carrying out focusing from an infinitely distant object to a closely distant object; and predetermined conditional expressions being satisfied, thereby the focusing lens group(s) being reduced in weight.

公开(公告)号：US20200379225A1

公开(公告)日：2020-12-03

申请号：US16995196

申请日：2020-08-17

Applicant: Nikon Corporation

Inventor： Atsushi SHIBAYAMA ,  Kosuke MACHIDA

IPC: G02B15/22 ,  G02B15/173

Abstract: Provided is a variable power optical system (ZL) used for an optical apparatus such as a camera (1). The variable power optical system (ZL) includes, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having negative refractive power; a fourth lens group having positive refractive power; and a fifth lens group. Upon zooming from a wide-angle end state to a telephoto end state, a distance between each of the lens groups changes, and upon focusing from an object at infinity to an object at a close distance, the third lens group moves in the optical axis direction.

公开(公告)号：US20200341251A1

公开(公告)日：2020-10-29

申请号：US16764874

申请日：2017-11-20

Applicant: Nikon Corporation

Inventor： Kosuke MACHIDA

IPC: G02B15/20 ,  G02B15/14 ,  G02B13/18 ,  G02B15/177

Abstract: A variable magnification optical system comprising a plurality of lens groups and, upon varying a magnification, distances between respective lens groups in the plurality of lens groups being varied. The plurality of lens groups comprises an object side focusing lens group which is moved upon carrying out focusing and at least one image side focusing lens group disposed in a more image side than the object side focusing lens group and moved with a trajectory differing from that of the object side focusing lens group, upon carrying out focusing. The predetermined conditional expressions are satisfied. Thus, variations in aberrations upon varying magnification from the wide angle end state to the telephoto end state as well as variations in aberrations upon carrying out focusing from an infinite distance object to a close distance object can be suppressed superbly.

公开(公告)号：US20190384043A1

公开(公告)日：2019-12-19

申请号：US16345169

申请日：2016-11-21

Applicant: Nikon Corporation

Inventor： Kosuke MACHIDA

IPC: G02B15/14 ,  G02B27/64 ,  G03B5/04 ,  G03B5/02

Abstract: A zoom optical system ZL comprises, in order from an object: a first lens group (G1) having a positive refractive power; a second lens group (G2) having a negative refractive power; a third lens group (G3) having a positive refractive power; and a subsequent lens group (GR), wherein upon zooming, a distance between the first lens group (G1) and the second lens group (G2) changes, a distance between the second lens group (G2) and the third lens group (G3) changes, and a distance between the third lens group (G3) and the subsequent lens group (GR) changes, the subsequent lens group (GR) comprises a focusing lens group that moves upon focusing, and following conditional expressions are satisfied, 0.18

公开(公告)号：US20190353880A1

公开(公告)日：2019-11-21

申请号：US16345203

申请日：2016-11-21

Applicant: Nikon Corporation

Inventor： Kosuke MACHIDA

IPC: G02B15/14 ,  G02B15/16

Abstract: A zoom optical system comprises, in order from an object: a front lens group (GFS) having a positive refractive power; an M1 lens group (GM1) having a negative refractive power; an M2 lens group (GM2) having a positive refractive power; and an RN lens group (GRN) having a negative refractive power, wherein upon zooming, distances between the front lens group and the M1 lens group, between the M1 lens group and the M2 lens group, and between the M2 lens group and the RN lens group change, upon focusing from an infinite distant object to a short distant object, the RN lens group moves, and the M2 lens group comprises an A lens group that satisfies a following conditional expression, 1.10

公开(公告)号：US20180356618A1

公开(公告)日：2018-12-13

申请号：US15778255

申请日：2016-11-28

Applicant: Nikon Corporation

Inventor： Kosuke MACHIDA

IPC: G02B15/20

Abstract: A zoom optical system (ZL) comprises, in order from an object: a first lens group (G1) having positive refractive power; an intermediate group (GM) including at least one lens group and having negative refractive power as a whole; an intermediate side lens group (GRP1) having positive refractive power; a subsequent side lens group (GRP2) having positive refractive power; and a subsequent group (GR) including at least one lens group. The subsequent side lens group (GRP2) moves upon zooming. The subsequent side lens group (GRP2) includes at least two lenses. A following conditional expression is satisfied. 0.2

公开(公告)号：US20180259751A1

公开(公告)日：2018-09-13

申请号：US15759829

申请日：2016-09-16

Applicant: Nikon Corporation

Inventor： Kosuke MACHIDA

IPC: G02B15/173 ,  G02B15/20

Abstract: Comprising a positive first lens group G1 disposed at a most object side, a negative intermediate group G2 disposed at an image side of the first lens group G1, a positive focusing group G3 disposed at an image side of the intermediate group G2, the focusing group G3 being moved upon focusing, and a positive image side group G4 disposed at an image side of the focusing group G3; upon varying magnification, a distance between the first lens group G1 and the intermediate group G2, a distance between the intermediate group G2 and the focusing group G3 and a distance between the focusing group G3 and the image side group G4 being varied; and the image side group G4 comprising, in order from an object side, a positive A group G4A, a negative B group G4B satisfying a predetermined conditional expression with respect to the A group G4A, and a C group G4C, whereby a variable magnification optical system having excellent optical performance and a focusing lens group reduced in weight in order to attain high speed focusing operation, and others are provided.

公开(公告)号：US20180052311A1

公开(公告)日：2018-02-22

申请号：US15539055

申请日：2015-12-25

Applicant: Nikon Corporation

Inventor： Kosuke MACHIDA

IPC: G02B15/173 ,  G02B15/177 ,  G02B15/20 ,  G02B27/64 ,  G02B13/18

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, the first lens group moves with respect to an image plane, the distance between the first lens group and the negative lens group is changed, and the distance between the negative lens group and the positive lens group 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 a single lens component, wherein the positive lens group is constituted by a front group having a positive refractive power and a rear group having a negative refractive power, and the distance between the front group and the rear group is the largest air distance among air distances in the positive lens group, and wherein the rear group is constituted by two lens components.