公开(公告)号：US20030223122A1

公开(公告)日：2003-12-04

申请号：US10431464

申请日：2003-05-08

Applicant: PENTAX Corporation

Inventor： Hiroyasu Ozaki

IPC: G02B015/14

CPC classification number: G02B15/14

Abstract: A zoom lens system includes a first to a third lens groups. Upon zooming, the distance between the first and second lens groups increases, the distance between the second and third lens groups decreases. Each lens group is positioned closest to the object at the long focal length extremity. The third lens group includes first and second sub-lens groups. The first sub-lens group with at least one aspherical surface is positioned at the object-side end a reference distance, and the negative second sub-lens group is positioned at the image-side end thereof. The zoom lens system satisfies the following conditions: 1.7

Abstract translation: 变焦透镜系统包括第一至第三透镜组。 在变焦时，第一和第二透镜组之间的距离增加，第二和第三透镜组之间的距离减小。 每个透镜组在长焦距末端处定位成最接近物体。 第三透镜组包括第一和第二子透镜组。 具有至少一个非球面的第一子透镜组在物体侧端部位于参考距离处，并且负的第二子透镜组位于其图像侧端。 变焦镜头系统满足以下条件：1.7

公开(公告)号：US20030214705A1

公开(公告)日：2003-11-20

申请号：US10431465

申请日：2003-05-08

Applicant: PENTAX Corporation

Inventor： Hiroyasu Ozaki

IPC: G02B017/00 ,  G02B021/00 ,  G02B023/00

CPC classification number: G02B15/173

Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, and a positive third lens group, in this order from the object. Upon zooming from the short focal length extremity to the long focal length extremity, the positive first lens group remains stationary, the negative second lens group moves toward the image, and the positive third lens group moves toward the object. The positive first lens group includes a first sub-lens group which is stationary and a second sub-lens group which functions as a focusing lens group.

Abstract translation: 变焦透镜系统包括正的第一透镜组，负的第二透镜组和正的第三透镜组。 当从短焦距端子变焦到长焦距端极时，正的第一透镜组保持静止，负的第二透镜组朝向图像移动，并且正的第三透镜组向着物体移动。 正的第一透镜组包括固定的第一子透镜组和用作聚焦透镜组的第二子透镜组。