公开(公告)号：US09720208B2

公开(公告)日：2017-08-01

申请号：US15083670

申请日：2016-03-29

Applicant: TAMRON CO., LTD.

Inventor： Keisuke Omori

IPC: G02B9/12 ,  G02B13/00 ,  G02B27/00

CPC classification number: G02B9/12 ,  G02B13/0015 ,  G02B27/0025

Abstract: An inner focusing lens has sequentially from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a negative refractive power. The first lens group has negative meniscus lenses disposed farthest on the object side thereof. The second lens group is moved along the optical axis whereby focusing from a focus state for an object at infinity to a focus state for the minimum object distance is performed. The inner focusing lens satisfies predetermined conditions and thereby, realizes a compact inner focusing lens having high imaging performance at wide angles, suitable for compact cameras having a function of capturing video.

公开(公告)号：US09594231B2

公开(公告)日：2017-03-14

申请号：US15083660

申请日：2016-03-29

Applicant: TAMRON CO., LTD.

Inventor： Keisuke Omori

IPC: G02B9/12 ,  G02B13/00 ,  G02B27/00

CPC classification number: G02B9/12 ,  G02B13/0015 ,  G02B27/0025

Abstract: An inner focusing lens has sequentially from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a negative refractive power. The first lens group has negative meniscus lenses disposed farthest on the object side thereof. The second lens group is moved along the optical axis whereby focusing from a focus state for an object at infinity to a focus state for the minimum object distance is performed. The inner focusing lens satisfies predetermined conditions and thereby, realizes a compact inner focusing lens having high imaging performance at wide angles, suitable for compact cameras having a function of capturing video.

Abstract translation: 内部聚焦透镜从物体侧顺序地具有正屈光力的第一透镜组，具有负折光力的第二透镜组和具有负屈光力的第三透镜组。 第一透镜组在其物体侧具有最远的负弯月透镜。 第二透镜组沿着光轴移动，从而执行从无限远的物体的焦点状态到最小对象距离的聚焦状态的聚焦。 内聚焦透镜满足预定条件，从而实现了具有高广角成像性能的紧凑型内聚焦透镜，适用于具有拍摄视频功能的小型照相机。