公开(公告)号：US20160238823A1

公开(公告)日：2016-08-18

申请号：US15044478

申请日：2016-02-16

Applicant: Tamron Co., Ltd.

Inventor： Hisayuki Yamanaka ,  Keisuke Okada ,  Yoshito Iwasawa

IPC: G02B13/02 ,  G02B13/00 ,  G02B27/00 ,  G02B9/64

CPC classification number: G02B13/02 ,  G02B9/64 ,  G02B13/006 ,  G02B27/0025

Abstract: The optical system of the present invention includes, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; and a third lens group G3 having positive refractive power, wherein the first lens group G1 and the third lens group G3 are fixed in an optical axis direction, while the second lens group G2 is moved in the optical axis direction to focus on from an object at infinity to an object at a finite distance, the third lens group G3 includes, in order from the object side: an object-side group G3a; an aperture stop S; and an image-side group G3b, and a specified condition is satisfied.

Abstract translation: 本发明的光学系统从物体侧依次包括具有正折射力的第一透镜组G1; 具有负屈光力的第二透镜组G2; 和具有正折射力的第三透镜组G3，其中第一透镜组G1和第三透镜组G3沿光轴方向固定，而第二透镜组G2沿光轴方向移动以从对象聚焦 在有限距离处的物体无限远地，第三透镜​​组G3从物体侧起依次包括物体侧组G3a; 孔径光阑S; 和图像侧组G3b，并且满足指定条件。

公开(公告)号：US08867144B2

公开(公告)日：2014-10-21

申请号：US13760973

申请日：2013-02-06

Applicant: Tamron Co., Ltd.

Inventor： Hisayuki Yamanaka

IPC: G02B15/14 ,  G02B15/24 ,  G02B15/17

CPC classification number: G02B15/24 ,  G02B15/17

Abstract: The present invention is directed to providing a large aperture telephotographing zoom lens that employs an inner-focusing system to enable quick focusing and avoid a great aberration when the zoom lens renders the close object in focus. The zoom lens comprises at least five groups of lens pieces arranged in series, namely, the foremost or first lens group of positive refractivity positioned the closest to the object, the succeeding second lens group of negative refractivity, the third lens group of negative refractivity, the fourth lens group of positive refractivity, and the rearmost or fifth lens group of positive refractivity. During varying the magnification for zooming in a transition from the wide-angle end to the telephoto end, all the lens pieces of the second, third, and fourth lens groups are moved toward the image plane, and the third lens group alone is displaced for focusing.

Abstract translation: 本发明旨在提供一种大孔径长焦摄影变焦镜头，其采用内部聚焦系统来实现快速聚焦，并且当变焦镜头使焦点对准物体时避免大的像差。 变焦透镜包括至少五组串联布置的透镜片，即位于最接近物体的正折射率的最前面或第一透镜组，负折射率的后续第二透镜组，负折射率的第三透镜组， 正折射率的第四透镜组和正折射率的最后或第五透镜组。 在变化用于放大从广角端到望远端的转变的放大倍数时，第二，第三和第四透镜组的所有透镜片朝向图像平面移动，并且仅第三透镜组移位， 聚焦。