公开(公告)号：US20160209624A1

公开(公告)日：2016-07-21

申请号：US14992259

申请日：2016-01-11

Applicant: HOYA CORPORATION

Inventor： Akitoshi USUI

IPC: G02B13/00 ,  G02B27/00 ,  G02B9/34

CPC classification number: G02B13/004

Abstract: An imaging optical system includes, at the vicinity of the optical axis, a positive first lens element having an object-side convex surface, a negative second lens element having an object-side concave surface, a positive third lens element having an image-side convex surface, and a fourth lens element having an image-side concave surface. The fourth lens element is provided with aspherical surfaces on both sides such that a combined refractive power thereof has an increasingly weaker negative refractive power toward the outer periphery thereof. The following conditions (1) and (2) are satisfied: 38

Abstract translation: 成像光学系统在光轴附近包括具有物体侧凸面的正的第一透镜元件，具有物体侧凹面的负的第二透镜元件，具有图像侧的正的第三透镜元件 凸面，以及具有图像侧凹面的第四透镜要素。 第四透镜元件在两侧设置有非球面，使得其组合的屈光力对其外周具有越来越弱的负折光力。 满足以下条件（1）和（2）：38 <＆ngr; d1-＆ngr; d2 <80（1）和-1.2

公开(公告)号：US20180364452A1

公开(公告)日：2018-12-20

申请号：US16108825

申请日：2018-08-22

Applicant: HOYA CORPORATION

Inventor： Akitoshi USUI ,  Yutaka TAKAKUBO

IPC: G02B13/00 ,  G02B15/177 ,  G02B13/18 ,  G02B9/60 ,  G02B9/64 ,  G02B9/62

CPC classification number: G02B13/006 ,  G02B9/60 ,  G02B9/62 ,  G02B9/64 ,  G02B13/002 ,  G02B13/0045 ,  G02B13/18 ,  G02B15/177

Abstract: An imaging optical system includes a positive or negative first lens group including a negative lens element closest to the object, a diaphragm, and a positive second lens group. The negative lens element closest to the object has an object-side aspherical surface including a paraxial convex surface, a paraxial curvature that is the greatest within the effective aperture, and a portion within the effective aperture having a curvature less than ½ of the paraxial curvature. These conditions are satisfied: R1/f 0.4 −2.5 56 “f” designates the overall focal length; f1, R1 and D1 respectively designate the focal length, paraxial radius of curvature of an object-side surface, and thickness, of the negative lens element closest to the object; and V designates the Abbe number regarding the d-line of a lens element, within the second lens group, closest to the diaphragm.

公开(公告)号：US20170269334A1

公开(公告)日：2017-09-21

申请号：US15450456

申请日：2017-03-06

Applicant: HOYA CORPORATION

Inventor： Akitoshi USUI ,  Yutaka TAKAKUBO

IPC: G02B13/00 ,  G02B9/62 ,  G02B9/64 ,  G02B9/60

CPC classification number: G02B13/006 ,  G02B9/60 ,  G02B9/62 ,  G02B9/64 ,  G02B13/002 ,  G02B13/0045 ,  G02B13/18 ,  G02B15/177

Abstract: An imaging optical system includes a positive or negative first lens group including a negative lens element closest to the object, a diaphragm, and a positive second lens group. The negative lens element closest to the object has an object-side aspherical surface including a paraxial convex surface, a paraxial curvature that is the greatest within the effective aperture, and a portion within the effective aperture having a curvature less than ½ of the paraxial curvature. These conditions are satisfied: R1/f 0.4 −2.5 56 “f” designates the overall focal length; f1, R1 and D1 respectively designate the focal length, paraxial radius of curvature of an object-side surface, and thickness, of the negative lens element closest to the object; and V designates the Abbe number regarding the d-line of a lens element, within the second lens group, closest to the diaphragm.