The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2014
Filed:
May. 08, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Yuki Nagao, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A lens barrel includes a moving lens unit that moves in accordance with a zooming operation, a focus lens that moves to correct an image plane variation caused by a movement of the moving lens unit, a driver that moves the focus lens, a controller that controls the driver, a zoom state detector that detects a zoom state, a focus lens detector that detects a position of the focus lens, a storage portion that stores tracking data indicating the position of the focus lens to correct the image plane variation, and a data correction portion that measures a real position of the focus lens in an in-focus state in a plurality of zoom states for each zooming operation in directions from wide angle to telephoto sides and from the telephoto to wide angle sides to generate correction data and correct the tracking data based on the correction data.