Invention Grant
- Patent Title: Zoom lens and image pickup apparatus having the same
- Patent Title (中): 具有相同的变焦镜头和摄像装置
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Application No.: US12776466Application Date: 2010-05-10
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Publication No.: US08208205B2Publication Date: 2012-06-26
- Inventor: Yoshihisa Tashiro
- Applicant: Yoshihisa Tashiro
- Applicant Address: JP
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP
- Agency: Rossi, Kimms & McDowell LLP
- Priority: JP2009-114059 20090509; JP2010-035248 20100219
- Main IPC: G02B15/14
- IPC: G02B15/14

Abstract:
A zoom lens comprises a first lens group having a negative refractive power and a second lens group having a positive refractive power in order from object to image sides, an interval between the first and second lens groups changes in a zoom operation, the first lens group is constituted by negative and positive lenses in order from the object to image sides, the negative and positive lenses of the first lens group are arranged at intervals, the second lens group is constituted by three lenses including positive and negative lenses in order from the object to image sides, and a radius of curvature of a lens surface at the object side of the negative lens constituting the first lens group, a shape of a negative lens having the maximum refractive power constituting the second lens group, and a refractive power of the second lens group are appropriately set.
Public/Granted literature
- US20100284093A1 ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME Public/Granted day:2010-11-11
Information query