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:
Jul. 22, 2003
Filed:
Feb. 25, 2000
Wataru Yagi, Aichi-ken, JP;
Kouta Maruyama, Aichi-ken, JP;
Atsunao Itoh, Aichi-ken, JP;
Yoshio Kato, Aichi-ken, JP;
Aisin Seiki Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A magnetostrictive device for a torque sensor which has a high sensor sensitivity whether the excitation frequency is in a high frequency range or in a low frequency range and can withstand excess load torques well, and also a method of easily manufacturing the device. In manufacturing the magnetostrictive device for a torque sensor, which has a magnetic anisotropic portion formed on the surface of a shaft body thereof, the method of forming the magnetic anisotropic portion comprises the steps of: forming spiral grooves in the surface of the shaft body to form a plurality of troughs and ridges alternately; and directly applying a compressive stress only to the ridges to cause deformations accompanied by plastic flow and to provide an almost planar plateau portion at a crest portion of each of the ridges