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:
Mar. 27, 2007
Filed:
Feb. 25, 2004
Teruo Mori, Tokyo, JP;
Teruo Mori, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A contraction type actuatoris provided which can efficiently and evenly apply a bias magnetic field to a magnetostrictive rod to obtain a large contraction amount, while having a small and simple structure. In the contraction type actuator, a giant magnetostrictive rodflexibly expands and contracts by controlling the strength of a magnetic field applied by a magnet coil. A bias magnet comprises a first bias magnetand a second bias magnet. The fist bias magnetin an approximately cylindrical shape is coaxially disposed around the giant magnetostrictive rod. The second bias magnetis disposed in the inner spaceA of the first bias magnet, and is polarized in the direction of drawing a part of a magnetic field generated by the first bias magnetinto the inner spaceA.