公开(公告)号：US09678327B2

公开(公告)日：2017-06-13

申请号：US14751159

申请日：2015-06-26

Applicant: FUJIFILM Corporation

Inventor： Keisuke Harada

IPC: G02B9/04 ,  G02B9/00 ,  G02B9/08 ,  G02B23/24

CPC classification number: G02B23/243

Abstract: An endoscope objective lens consists essentially of, in order from the object side, a negative first lens group, a stop, and a positive second lens group. At least one of the first lens group and the second lens includes only one cemented lens which is formed by a positive lens and a negative lens cemented together. The entire system includes a positive single lens. The endoscope objective lens satisfies given condition expressions relating to the focal length of the entire system, the center thickness of the positive single lens, the center thickness of the cemented lens, the distance from the most object-side lens surface to the stop, and the distance from the stop to the most image-side lens surface.

公开(公告)号：US09468358B2

公开(公告)日：2016-10-18

申请号：US14489753

申请日：2014-09-18

Applicant: FUJIFILM CORPORATION

Inventor： Keisuke Harada

IPC: G02B9/08 ,  G02B9/10 ,  A61B1/00 ,  G02B9/12 ,  G02B23/24 ,  G02B13/04

CPC classification number: A61B1/00096 ,  A61B1/00188 ,  G02B9/10 ,  G02B9/12 ,  G02B13/04 ,  G02B23/243

Abstract: The objective lens for an endoscope substantially consists of a first lens group having a negative refractive power, a stop, and a second lens group having a positive refractive power in this order from the object side. The first lens group consists of a single negative lens. The second lens group consists of two or fewer lenses. When the focal length of the first lens group is f1 and the focal length of the entire system is f, conditional expression (1): −0.9

Abstract translation: 用于内窥镜的物镜基本上由具有负屈光力的第一透镜组，具有正折射力的第二透镜组从物体侧依次组成。 第一透镜组由单个负透镜组成。 第二透镜组由两个或更少的透镜组成。 当第一透镜组的焦距为f1并且整个系统的焦距为f时，满足条件表达式（1）：-0.9

公开(公告)号：US09207440B2

公开(公告)日：2015-12-08

申请号：US14451459

申请日：2014-08-05

Applicant: FUJIFILM CORPORATION

Inventor： Keisuke Harada

IPC: G02B15/14 ,  G02B15/177

CPC classification number: G02B15/177

Abstract: The imaging lens substantially consists of a negative first lens group in which a biconvex lens, a cemented lens, a plurality of lenses including a positive lens and a negative lens are arranged; a positive second lens group including a cemented lens; a negative third lens group in which a single lens forming a meniscus lens with a convex surface toward the object side or a plurality of lenses constituted in such a manner that the absolute value of the radius of curvature of a lens surface disposed on the most image side is smaller than the absolute value of the radius of curvature of a lens surface disposed on the most object side; and a positive fourth lens group including a positive lens in this order from the object side. This imaging lens is configured in such a manner that conditional expression (1) is satisfied: 0.7

Abstract translation: 成像透镜基本上由负的第一透镜组组成，其中布置双凸透镜，胶合透镜，包括正透镜和负透镜的多个透镜; 包括胶合透镜的正的第二透镜组; 其中形成具有朝向物体侧的凸面的弯月形透镜的单透镜或多个透镜构成的负第三透镜组，使得设置在最多图像上的透镜表面的曲率半径的绝对值 侧比设置在最物体侧的透镜表面的曲率半径的绝对值小; 以及从物体侧开始依次包括正透镜的正第四透镜组。 该成像透镜以满足条件式（1）的方式配置：0.7 <| f3 | / f <4.0。