Invention Grant
US08970967B2 Zoom lens, image-pickup apparatus having the same, and image projection apparatus having the same
有权
变焦镜头,具有该镜头的摄像装置和具有该变焦镜头的图像投影装置
- Patent Title: Zoom lens, image-pickup apparatus having the same, and image projection apparatus having the same
- Patent Title (中): 变焦镜头,具有该镜头的摄像装置和具有该变焦镜头的图像投影装置
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Application No.: US14031718Application Date: 2013-09-19
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Publication No.: US08970967B2Publication Date: 2015-03-03
- Inventor: Yoshihisa Tashiro , Norihito Hiasa
- Applicant: Canon Kabushiki Kaisha
- Applicant Address: JP
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP
- Agency: Rossi, Kimms & McDowell LLP
- Priority: JP2012-207970 20120921
- Main IPC: G02B15/14
- IPC: G02B15/14 ; H04N5/232 ; G02B13/18 ; G02B15/177

Abstract:
The zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a rear unit including one or more lens units, a distance between every adjacent lens units varies during zooming, and an aperture diaphragm on the image side of the first lens unit, a combined focal length of the rear unit at a wide-angle end being positive. One lens unit LG on the object side of the aperture diaphragm is made of a solid material, and includes an optical element GnNL having a negative refractive power and another optical element having a positive refractive power, and the predetermined conditions are satisfied.
Public/Granted literature
- US20140085513A1 ZOOM LENS, IMAGE-PICKUP APPARATUS HAVING THE SAME, AND IMAGE PROJECTION APPARATUS HAVING THE SAME Public/Granted day:2014-03-27
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