Invention Grant
- Patent Title: Zoom lens and image pickup apparatus equipped with zoom lens
- Patent Title (中): 变焦镜头和配有变焦镜头的摄像设备
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Application No.: US13488086Application Date: 2012-06-04
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Publication No.: US08928989B2Publication Date: 2015-01-06
- Inventor: Yoshihisa Tashiro , Toyokatsu Fujisaki
- Applicant: Yoshihisa Tashiro , Toyokatsu Fujisaki
- Applicant Address: JP Tokyo
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP Tokyo
- Agency: Canon USA Inc IP Division
- Priority: JP2011-129910 20110610
- Main IPC: G02B15/14
- IPC: G02B15/14 ; G02B13/00 ; G02B15/17 ; G02B15/173 ; G02B13/12

Abstract:
A zoom lens includes, a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, a reflective element, and a rear lens group including two or more lens units and an aperture stop, in which the first lens unit, the second lens unit, and two or more lens units of the rear lens group are moved while the reflective element is stationary during zooming, wherein movement amounts M1 and M2 of the first and second lens units during zooming, a movement amount Ms of the aperture stop, and focal lengths fw and ft of the entire zoom lens at the wide-angle end and the telephoto end, respectively, lateral magnifications β2w and β2t of the second lens unit, a distance LSw from the first lens surface to the aperture stop at the wide-angle end are appropriately set.
Public/Granted literature
- US20120314299A1 ZOOM LENS AND IMAGE PICKUP APPARATUS EQUIPPED WITH ZOOM LENS Public/Granted day:2012-12-13
Information query