公开(公告)号：US20180224635A1

公开(公告)日：2018-08-09

申请号：US15944143

申请日：2018-04-03

Applicant: OLYMPUS CORPORATION

Inventor： Keisuke TAKADA ,  Yoshihiro UCHIDA

IPC: G02B13/04 ,  G02B13/18 ,  G02B27/00 ,  G02B23/24

CPC classification number: G02B13/04 ,  G02B13/004 ,  G02B13/18 ,  G02B23/243 ,  G02B27/0025

Abstract: An image pickup apparatus includes an optical system which includes a plurality of lenses, and an image sensor which is disposed at an image position of the optical system, wherein the optical system has a lens surface positioned nearest to object and a lens surface positioned nearest to image, and includes in order from the object side, a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, and a fourth lens, and an object-side surface of the second lens has a shape which is convex toward the object side, and the following conditional expressions (1) and (2) are satisfied: αmax−αmin

公开(公告)号：US20130242412A1

公开(公告)日：2013-09-19

申请号：US13789954

申请日：2013-03-08

Applicant: OLYMPUS CORPORATION

Inventor： Yoshihiro UCHIDA ,  Sanae OKI

IPC: G02B13/00

CPC classification number: G02B13/0045

Abstract: An image pickup optical system includes in order from an object side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power. An aperture stop is disposed nearest to the object side, and the first lens has a biconvex shape. An image-side surface of the third lens has in a peripheral portion, an area of which, a refractive power becomes weaker as compared to a refractive power of a central portion thereof. An object-side optical function surface of the fourth lens has a concave shape, and an object-side surface of the fifth lens has a concave shape.

Abstract translation: 摄像光学系统从物体侧依次包括具有正折光力的第一透镜，具有负折光力的第二透镜，具有正折光力的第三透镜，具有正折光力的第四透镜，以及 具有负屈光力的第五透镜。 孔径光阑设置成最靠近物体侧，第一透镜具有双凸形状。 第三透镜的像侧表面具有与其中心部分的折射力相比折射力变弱的周边部分。 第四透镜的物体侧光学功能表面具有凹形，并且第五透镜的物体侧表面具有凹形。