Invention Grant
- Patent Title: Zoom lens
- Patent Title (中): 变焦镜头
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Application No.: US13448653Application Date: 2012-04-17
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Publication No.: US08760769B2Publication Date: 2014-06-24
- Inventor: Yoji Kubota , Kenichi Kubota , Hitoshi Hirano
- Applicant: Yoji Kubota , Kenichi Kubota , Hitoshi Hirano
- 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 & Associates LLC
- Main IPC: G02B15/14
- IPC: G02B15/14

Abstract:
A zoom lens includes a first lens group G1 that is negative, a second lens group G2 that is negative, and a third lens group G3 that is positive. The first lens group G1 includes a first lens L1 that is negative and a prism P, and the second lens group G2 includes a second lens L2 that is positive and a third lens L3 that is negative. The third lens group G3 includes a stop ST, a fourth lens L4 that is positive, and a fifth lens L5 that is negative. According to this configuration, upon changing magnification from a wide-angle end to a telephoto end, the first lens group G1 is secured, the second lens group G2 first moves to the image plane side and then moves to the object side, and the third lens group G3 linearly moves to the object side.
Public/Granted literature
- US20120275033A1 ZOOM LENS Public/Granted day:2012-11-01
Information query