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. 02, 2021
Filed:
Aug. 22, 2018
Canon Kabushiki Kaisha, Tokyo, JP;
Masafumi Kimura, Kawasaki, JP;
Kyosuke Sato, Kawasaki, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A drive apparatus comprising a stationary frame with a coil, a movable frame with a magnetic circuit held movably in a direction orthogonal to a first direction, and a drive unit that moves the movable frame by applying electric current to the coil. The magnetic circuit is constituted by aligning a first magnet having a magnetization direction parallel to the first direction, a second magnet having a magnetization direction opposite to the first magnet, and a third magnet between the first and second magnets in a direction orthogonal to the first direction. The third magnet has a magnetization direction that has a pole in the same direction of the poles of the first and second magnets when viewed from the coil side. The side spaces of the first and second magnets opposite to the third magnet are occupied by material whose magnetic permeability is lower than the magnets.