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:
Apr. 14, 2009
Filed:
Oct. 12, 2007
Kenichi Ito, Zama, JP;
Tadahiro Nakayama, Yokohama, JP;
Kenichi Ito, Zama, JP;
Tadahiro Nakayama, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A linear actuator includes a first inner permanent magnet joined to an inner yoke, a second inner permanent magnet joined to the inner yoke, an outer yoke, a member interconnecting the outer and inner yokes, a first outer permanent magnet joined to an inner surface of the outer yoke, a second outer permanent magnet joined to an inner surface of the outer yoke, a first armature coil inserted into a gap between the first inner and outer permanent magnets, and a second armature coil inserted into another gap between the first inner and outer permanent magnets. The inner yoke includes an inner thicker portion axially opposed to the inner permanent magnets and having a larger radial thickness than a remaining portion. The outer yoke includes an outer thicker portion axially opposed to the first and second outer permanent magnets and having a larger radial thickness than a remaining portion.