Invention Grant
US07672063B2 Zoom lens, optical apparatus equipped with the zoom lens and method for forming an image of an object and varying a focal length
有权
变焦镜头，配备有变焦镜头的光学装置以及用于形成物体的图像并改变焦距的方法
- Patent Title: Zoom lens, optical apparatus equipped with the zoom lens and method for forming an image of an object and varying a focal length
- Patent Title (中): 变焦镜头，配备有变焦镜头的光学装置以及用于形成物体的图像并改变焦距的方法
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Application No.: US12256731Application Date: 2008-10-23
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Publication No.: US07672063B2Publication Date: 2010-03-02
- Inventor: Toshinori Take
- Applicant: Toshinori Take
- Applicant Address: JP Tokyo
- Assignee: Nikon Corporation
- Current Assignee: Nikon Corporation
- Current Assignee Address: JP Tokyo
- Agency: Miles & Stockbridge P.C.
- Priority: JP2007-285759 20071102
- Main IPC: G02B15/14
- IPC: G02B15/14
Abstract:
A zoom lens comprises the following lens groups in the order from an object side: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; and a fourth lens group having a positive refracting power; wherein, upon zooming, at least the first lens group and the fourth lens group move to the object side; and wherein, upon focusing, the fourth lens group comprises a front lens group, and a rear lens group arranged with an air space on an image side of the front lens group, and the rear lens group is moved in a direction of an optical axis of the zoom lens.
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