公开(公告)号：US09042039B2

公开(公告)日：2015-05-26

申请号：US14064923

申请日：2013-10-28

Applicant: FUJIFILM Corporation

Inventor： Taro Asami

IPC: G02B13/04 ,  G02B9/34 ,  G02B13/00 ,  G02B13/06

CPC classification number: G02B9/34 ,  G02B13/004 ,  G02B13/04 ,  G02B13/06

Abstract: An imaging lens includes negative first lens, negative second lens, third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side, and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side. Further, the following conditional formula (6) is satisfied: 0.75≦(R8−R9)/(R8+R9)≦1.0  (6), where R8: a curvature radius of an object-side surface of the fourth lens, and R9: a curvature radius of an image-side surface of the fourth lens.

Abstract translation: 成像透镜包括负第一透镜，负第二透镜，具有朝向物体侧的凸面的平凸形状的第三透镜或具有朝向物体侧的凸面的正弯月形，以及第四透镜 具有朝向图像侧的凸面或具有朝向图像侧的凸面的正弯月形的平凸形状，从物体侧依次排列。 此外，满足以下条件式（6）：0.75＆nlE;（R8-R9）/（R8 + R9）＆nlE; 1.0（6）其中R8：第四透镜的物体侧表面的曲率半径， 和R9：第四透镜的图像侧表面的曲率半径。

公开(公告)号：US20140078604A1

公开(公告)日：2014-03-20

申请号：US14063099

申请日：2012-04-27

Applicant: FUJIFILM CORPORATION

Inventor： Taro Asami

IPC: G02B13/00 ,  G02B13/04

CPC classification number: G02B13/04 ,  G02B9/34 ,  G02B13/004 ,  G02B13/06

Abstract: An imaging lens consists of a negative first lens, a negative second lens, a third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side, and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side. Further, the following conditional formula (1) is satisfied: 2.25

Abstract translation: 成像透镜由负的第一透镜，负的第二透镜，具有朝向物体侧的凸面的平凸形状的第三透镜或具有朝向物体侧的凸面的正弯月形形成，以及 具有朝向图像侧的凸面的正平面凸部的第四透镜或具有朝向像侧的凸面的正弯月形状的第四透镜，其从物体侧依次配置。 此外，满足以下条件式（1）：2.25 <＆ngr; d2 /＆ngr; d3（1）其中＆ngr; d2：用于d线的第二透镜的材料的阿贝数，＆ngr; d3： 用于d线的第三透镜的材料的阿贝数。