Invention Grant
- Patent Title: Zoom lens
- Patent Title (中): 变焦镜头
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Application No.: US13547555Application Date: 2012-07-12
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Publication No.: US08711488B2Publication Date: 2014-04-29
- Inventor: Yoji Kubota
- Applicant: Yoji Kubota
- Applicant Address: JP Nagano JP Tochigi
- Assignee: Optical Logic Inc.,Kantatsu Co., Ltd.
- Current Assignee: Optical Logic Inc.,Kantatsu Co., Ltd.
- Current Assignee Address: JP Nagano JP Tochigi
- Agency: Kubotera & Associate, LLC
- Main IPC: G02B15/14
- IPC: G02B15/14

Abstract:
A zoom lens includes a first lens group that has a lens having negative refractive power and a light path changing member; a second lens group that includes a lens having positive refractive power and a lens having negative refractive power, and has negative refractive power as a whole; a third lens group that includes a stop, a front group lens having positive refractive power, and a rear group lens having negative refractive power, and has positive refractive power as a whole; and a fourth lens group having positive or negative refractive power. Upon changing magnification from a wide-angle end to a telephoto end, the first lens group and the fourth lens group are fixed. The second lens group moves to the object side after the second lens group moves to an image side, and the third lens group linearly moves to the object side.
Public/Granted literature
- US20130021677A1 ZOOM LENS Public/Granted day:2013-01-24
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