公开(公告)号：US08605365B2

公开(公告)日：2013-12-10

申请号：US13391668

申请日：2010-08-13

申请人： Junichi Fujisaki ,  Takashi Enomoto ,  Tomoya Koga

发明人： Junichi Fujisaki ,  Takashi Enomoto ,  Tomoya Koga

IPC分类号： G02B15/14

CPC分类号： G02B15/177

摘要： The objective of the present invention is to provide a zoom lens system having an f-number of approximately 1.3 at the wide extremity, a half angle-of-view of 75 degrees, and a zoom ratio of approximately 3:1. The solution to this objective is to provide a zoom lens system including a first lens group, having a negative refractive power, a diaphragm, and a second lens group, having a positive refractive power, in that order from the object side; wherein the first lens group and the second lens group move in the optical axis direction so that the distance therebetween decreases upon zooming from the wide-angle extremity to the telephoto extremity.

摘要翻译： 本发明的目的是提供一种变焦透镜系统，其在宽端具有约1.3的f数，75度的半视角和大约3:1的变焦比。 该目的的解决方案是从物体侧依次提供具有正折光力的具有负折光力的第一透镜组，第二透镜组和第二透镜组的变焦透镜系统; 其中所述第一透镜组和所述第二透镜组在所述光轴方向上移动，使得在从所述广角端到远摄端的变焦时，其间的距离减小。

公开(公告)号：US20120147480A1

公开(公告)日：2012-06-14

申请号：US13391668

申请日：2010-08-13

申请人： Junichi Fujisaki ,  Takashi Enomoto ,  Tomoya Koga

发明人： Junichi Fujisaki ,  Takashi Enomoto ,  Tomoya Koga

IPC分类号： G02B15/14

CPC分类号： G02B15/177

摘要： The objective of the present invention is to provide a zoom lens system having an f-number of approximately 1.3 at the wide extremity, a half angle-of-view of 75 degrees, and a zoom ratio of approximately 3:1. The solution to this objective is to provide a zoom lens system including a first lens group, having a negative refractive power, a diaphragm, and a second lens group, having a positive refractive power, in that order from the object side; wherein the first lens group and the second lens group move in the optical axis direction so that the distance therebetween decreases upon zooming from the wide-angle extremity to the telephoto extremity,

摘要翻译： 本发明的目的是提供一种变焦透镜系统，其在宽端具有约1.3的f数，75度的半视角和大约3:1的变焦比。 该目的的解决方案是从物体侧依次提供具有正折光力的具有负折光力的第一透镜组，第二透镜组和第二透镜组的变焦透镜系统; 其中所述第一透镜组和所述第二透镜组在所述光轴方向上移动，使得在从所述广角端到远摄端的变焦时，所述第一透镜组和所述第二透镜组之间的距离减小，

公开(公告)号：US20200301117A1

公开(公告)日：2020-09-24

申请号：US16811074

申请日：2020-03-06

申请人： Tomoya Koga

发明人： Tomoya Koga

IPC分类号： G02B15/14 ,  G02B15/20

摘要： A zoom lens system includes a first lens group; a second lens group; and a subsequent lens group arranged in that order from the object side. The second lens group consists of a second lens group-a, a second lens group-b, and a second lens group-c arranged in that order from the object side. A distance between the first lens group and the second lens group increases and a distance between the second lens group and the subsequent lens group decreases during a change in magnification from a short focal length end to a long focal length end. During a change in focus from infinity to a short distance, the second lens group-b is movable to the image side, and a distance between the second lens group-a and the second lens group-b and a distance between the second lens group-b and the second lens group-c are changeable.

公开(公告)号：US20200174269A1

公开(公告)日：2020-06-04

申请号：US16575726

申请日：2019-09-19

申请人： Yoshifumi Sudoh ,  Tomoya Koga

发明人： Yoshifumi Sudoh ,  Tomoya Koga

IPC分类号： G02B27/64 ,  G02B15/14 ,  G02B15/163 ,  G02B15/20 ,  G03B5/04

摘要： A zoom lens system includes a first lens group having positive refractive power; a second lens group having negative refractive power; and a rear group, the first lens group, arranged in that order from an object side. The second lens group includes a second lens group-a having negative refractive power and a second lens group-b having negative refractive power arranged in that order from the object side. During a change in a focus from a short focal length end to a long focal length end to change a magnification power, a distance between the first lens group and the second lens group-a increases, a distance between the second lens group-a and the second lens group-b is changeable or stationary, and a distance between the second lens group-b and the rear lens group decreases.