Patents by Inventor Atsunao Itoh

Atsunao Itoh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Magnetostrictive device for torque sensor and method of manufacture of the same
    Patent number: 6595073
    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 1 for a torque sensor, which has a magnetic anisotropic portion 15 formed on the surface of a shaft body 10 thereof, the method of forming the magnetic anisotropic portion 15 comprises the steps of: forming spiral grooves in the surface of the shaft body 10 to form a plurality of troughs 16 and ridges 17 alternately; and directly applying a compressive stress only to the ridges 17 to cause deformations accompanied by plastic flow and to provide an almost planar plateau portion 171 at a crest portion of each of the ridges 17.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: July 22, 2003
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Wataru Yagi, Kouta Maruyama, Atsunao Itoh, Yoshio Kato