Invention Grant
- Patent Title: Zoom lens and image pickup apparatus including the same
- Patent Title (中): 缩放透镜和包括其的图像拾取装置
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Application No.: US13479394Application Date: 2012-05-24
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Publication No.: US08767313B2Publication Date: 2014-07-01
- Inventor: Kazuya Shimomura , Fumiaki Usui
- Applicant: Kazuya Shimomura , Fumiaki Usui
- Applicant Address: JP
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP
- Agency: Rossi, Kimms & McDowell, LLP
- Priority: JP2011-115344 20110524
- Main IPC: G02B15/14
- IPC: G02B15/14 ; G02B15/22

Abstract:
A zoom lens including, in order from object side: a positive first unit fixed for zooming; a negative second unit moving for zooming; a zoom unit including at least one unit moving for zooming; a stop; and a fixed unit. The first unit includes a negative first sub-unit not moving for focusing, and a positive second sub-unit and a positive third sub-unit moving toward image side and object side, respectively, when focusing from infinity object to proximity object. A focal lengths of the first and second units, a distance from a vertex of a surface closest to the image side in the first unit to an image side principal point position of the first unit, a thickness of the first unit on an optical axis, and lateral magnifications of the second and third sub-units when focusing on infinity object are appropriately set.
Public/Granted literature
- US20120300118A1 ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME Public/Granted day:2012-11-29
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