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:
Jan. 26, 2016
Filed:
Jun. 30, 2014
Canon Kabushiki Kaisha, Tokyo, JP;
Tomoaki Yamanaka, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, , JP;
Abstract
A control unit for a stepping motor includes an encoder and a controller. The controller controls the stepping motor based on information sent from an image pickup apparatus configured to capture an object via an image pickup optical system that includes the focus lens. in a case that the image pickup apparatus performs autofocusing in capturing a still image, the controller open-loop-controls the stepping motor in at least one of a drive start period and a drive stop period of the stepping motor, and feedback-controls the stepping motor using an output of the encoder between the drive start period and the drive stop period of the stepping motor. The controller open-loop-controls the stepping motor in a case that the image pickup apparatus performs the autofocusing in capturing a motion image.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile