公开(公告)号：US10295806B2

公开(公告)日：2019-05-21

申请号：US15297617

申请日：2016-10-19

Applicant: CANON KABUSHIKI KAISHA

Inventor： Nobuyuki Miyazawa ,  Tomoyuki Nakamura ,  Naotoshi Ogawa ,  Kazuya Shimomura

IPC: G02B15/14 ,  G02B15/173 ,  G02B15/177 ,  G02B15/20 ,  G02B15/16 ,  G02B15/17 ,  G02B15/24 ,  G02B9/60 ,  G02B9/62 ,  G02B5/00 ,  G02B27/64 ,  G02B7/04

Abstract: A zoom lens, includes, in order from object side: a front unit including a unit including a first unit arranged closest to the object side and not moving for zooming; an Nf unit including three or more lenses and having a negative refractive power; an stop; a first rear unit moving during zooming; a second rear unit moving during zooming; and a third rear unit not moving for zooming, in which: the front unit includes four or more lenses and includes one or more units having a positive refractive power; and a difference between positions of the first rear unit at a wide angle end and a telephoto end, a difference between positions of the second rear unit at the wide angle end and the telephoto end, a focal length of the second rear unit, and a focal length of the zoom at the wide angle end are appropriately set.

公开(公告)号：US10247927B2

公开(公告)日：2019-04-02

申请号：US15686260

申请日：2017-08-25

Applicant: FUJIFILM Corporation

Inventor： Kazuki Inoue ,  Yukiko Nagatoshi

IPC: G02B15/167 ,  G02B15/20 ,  G02B13/16 ,  G02B15/177 ,  G02B15/163

Abstract: In the zoom lens, a first optical system is formed on the magnification side, and a second optical system is formed on the reduction side, with the intermediate image formed between the first optical system and the second optical system. The second optical system consists of, in order from the magnification side, a first lens group that has a positive power, a second lens group that has a positive power, a third lens group that has a positive or negative power, and a fourth lens group that has a positive power. During zooming, the second lens group and the third lens group are moved by changing spacings between the groups adjacent to each other in a direction of an optical axis, and the fourth lens group remains stationary with respect to the reduction side imaging plane.

公开(公告)号：US10222594B2

公开(公告)日：2019-03-05

申请号：US15657501

申请日：2017-07-24

Applicant: CANON KABUSHIKI KAISHA

Inventor： Kohei Kimura

IPC: G02B15/14 ,  G02B15/20 ,  G02B15/167 ,  G02B27/00 ,  G02B15/173 ,  G02B5/08 ,  G02B27/42

Abstract: A zoom lens includes, in order from an object side to an image side, a positive first lens unit, a negative second lens unit, a middle lens group including at least one lens unit, a negative N minus second lens unit, a negative N minus first lens unit, and a positive Nth lens unit, where N is an integer of six or more, in which distances between the adjacent lens units change during zooming, the first lens unit moves toward the object side during zooming from a wide-angle end to a telephoto end, the N minus second lens unit moves during focusing, and a total lens length at the wide-angle end, a backfocus at the wide-angle end, and a lateral magnification of a combined system of the N minus first lens unit and the Nth lens unit at the wide-angle end are set appropriately.

公开(公告)号：US20190025561A1

公开(公告)日：2019-01-24

申请号：US16137637

申请日：2018-09-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Takuya IMAOKA

IPC: G02B15/20 ,  G02B13/16 ,  G03B21/14 ,  G02B27/00 ,  G02B13/18

Abstract: An imaging optical system includes a plurality of lens groups each moving such that spaces between each one of the plurality of lens groups change during a zooming. The imaging optical system conjugates a conjugate point on a magnification side and an intermediate imaging position, and conjugates a conjugate point on a reduction side and the intermediate imaging position. The imaging optical system includes a first lens group located at a furthest place on the magnification side and a rear group in this order from the magnification side toward the reduction side. The first lens group includes a field curvature correction lens group moving along an optical axis when an amount of a field curvature is changed, and a focusing lens group. The imaging optical system satisfies condition (4) below: |{(1−βcw2)×βcrw2}/{(1−βfw2)×βfrw2}|

公开(公告)号：US20190025560A1

公开(公告)日：2019-01-24

申请号：US16033322

申请日：2018-07-12

Applicant: CANON KABUSHIKI KAISHA

Inventor： Shinya Okuoka

IPC: G02B15/20 ,  G02B13/02

CPC classification number: G02B15/20 ,  G02B13/02 ,  G02B15/173

Abstract: Provided is a zoom lens consisting of: a positive first lens unit; a negative second lens unit; a positive third lens unit; and a rear lens group including at least one lens unit, wherein an interval between each pair of adjacent lens units is changed during zooming. The rear lens group includes a negative lens unit LR including at least one positive lens and at least one negative lens. The at least one negative lens includes a negative lens made of a material having a largest Abbe number of the at least one negative lens. Each of an extraordinary partial dispersion ratio of the material, distances of a lens surface on an image side of the lens unit LR to an image plane at a telephoto end and at a wide angle end, and a focal length of the lens unit LR is appropriately set.

公开(公告)号：US20190018229A1

公开(公告)日：2019-01-17

申请号：US16064807

申请日：2016-12-09

Applicant: Sony Corporation

Inventor： Naoki Miyagawa ,  Yonghua Chen

IPC: G02B13/18 ,  G02B15/20 ,  G02B15/177 ,  G02B9/62

CPC classification number: G02B13/18 ,  G02B9/62 ,  G02B13/009 ,  G02B15/173 ,  G02B15/177 ,  G02B15/20

Abstract: A zoom lens according to the disclosure includes a first lens group having positive refractive power, a second lens group, a third lens group, a fourth lens group, a fifth lens group, and a sixth lens group. The first lens group includes a front side first lens group fixed with respect to an image plane upon zooming from a wide end to a telephoto end and focusing from an infinite object to a short-distance object, and a rear side first lens group having positive refractive power. The second, third, and fifth lens groups travel along an optical axis upon zooming. The fourth and sixth lens groups are fixed with respect to the image plane in an optical axis direction upon zooming. At least two lens groups including the rear side first lens group travel along the optical axis upon focusing.

公开(公告)号：US10168514B2

公开(公告)日：2019-01-01

申请号：US15843254

申请日：2017-12-15

Applicant: FUJIFILM Corporation

Inventor： Masaru Yonezawa ,  Takuya Tanaka

IPC: G02B15/14 ,  G02B15/167 ,  G02B15/20

Abstract: The zoom lens consists of, in order from the object side, a first lens group that has a positive refractive power and remains stationary during zooming, a plurality of movable lens groups that move during zooming, and a final lens group that has a positive refractive power and remains stationary during zooming. The first lens group consists of, in order from the object side, a first lens group front group that has a negative refractive power and remains stationary during focusing, a first lens group intermediate group that has a positive refractive power and moves during focusing, and a first lens group rear group that has a positive refractive power. The first lens group front group has, successively in order from a position closest to the object side, a negative meniscus lens that is concave toward the image side and a negative lens.

公开(公告)号：US20180348476A1

公开(公告)日：2018-12-06

申请号：US15777910

申请日：2016-11-28

Applicant: Nikon Corporation

Inventor： Kosuke MACHIDA

IPC: G02B9/10 ,  G02B15/20 ,  G02B15/16

CPC classification number: G02B15/20

Abstract: A zoom optical system comprises, in order from an object: a first lens group (G1) having positive refractive power; a second lens group (G2) having negative refractive power; and a subsequent group (GR) including at least one lens group. Upon zooming, distances between the first lens group (G1) and the second lens group (G2) and between the second lens group (G2) and the subsequent group (GR) change. The subsequent group (GR) comprises a focusing group (Gfc) having negative refractive power for focusing. The first lens group (G1) comprises a 1-1st lens that has positive refractive power and is disposed closest to the object. A following conditional expression is satisfied: 0.20

公开(公告)号：US20180332257A1

公开(公告)日：2018-11-15

申请号：US16044982

申请日：2018-07-25

Applicant: NITTOH INC.

Inventor： Takahiko MATSUO

IPC: H04N9/31 ,  G02B17/08 ,  G03B21/14 ,  G02B15/20 ,  G03B21/00 ,  G02B13/16 ,  G03B21/28

CPC classification number: H04N9/315 ,  G02B13/16 ,  G02B15/20 ,  G02B17/08 ,  G02B17/0852 ,  G03B21/00 ,  G03B21/14 ,  G03B21/147 ,  G03B21/28 ,  H04N9/3141

Abstract: A projection optical system (10) projects from a first image plane (5) on a reducing side to a second image plane (6) on an enlargement side. The projection optical system (10) includes a first optical system (11) that includes a plurality of lenses and forms a first intermediate image (51) formed inside the first optical system (11) by light incident from the reducing side into a second intermediate image (52) on the enlargement side of the first optical system (11); a second optical system (12) that includes a first reflective surface (M1) with positive refractive power which is positioned further to the enlargement side than the second intermediate image (52); and a glass block (30) that is disposed between the first optical system (11) and the first reflective surface (M1), the glass block (30) passing light rays from the first optical system (11) to the second intermediate image (52).

公开(公告)号：US10114201B2

公开(公告)日：2018-10-30

申请号：US15464937

申请日：2017-03-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Isamu Izuhara ,  Naoto Nishimura

IPC: G02B15/177 ,  G02B15/20

Abstract: A zoom lens system includes, in the following order from an object side toward an image side, a first lens group with negative power, a second lens group with positive power, a third lens group with negative power, and a fourth lens group with positive power. The first lens group includes, in the following order from the object side toward the image side, a first lens element having a negative meniscus shape with a concave surface facing the image side, a second lens element having a negative meniscus shape with a concave surface facing the image side, a third lens element with a concave surface facing the image side, a fourth lens element with a convex surface facing the object side, and a fifth lens element with a concave surface facing the object side. The third lens element and the fourth lens element compose a cemented lens.