Patents by Inventor Yoshio Hirasawa

Yoshio Hirasawa 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).

  • Absolute encoder device and motor
    Patent number: 9379598
    Abstract: The present invention provides an absolute encoder device, including: a permanent magnet including a first magnetic pattern (bipolar) and a second magnetic pattern (multipolar); a first magnetic sensor for detecting a magnetic field of the first magnetic pattern; a second magnetic sensor for detecting a magnetic field of the second magnetic pattern; and a signal processing circuit for calculating an absolute rotation angle of a rotation shaft based on output signals of the first and second magnetic sensors. The first and second magnetic sensors and the signal processing circuit are fixed to a single substrate. The first magnetic pattern is formed on a plane extending in a direction crossing an axial direction inside the permanent magnet, and the second magnetic pattern is formed on an outer peripheral surface of the permanent magnet.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: June 28, 2016
    Assignee: Oriental Motor Co., Ltd.
    Inventors: Masayuki Someya, Yoshio Hirasawa, Sakao Ozeki
  • ABSOLUTE ENCODER DEVICE AND MOTOR
    Publication number: 20140015384
    Abstract: The present invention provides an absolute encoder device, including: a permanent magnet including a first magnetic pattern (bipolar) and a second magnetic pattern (multipolar); a first magnetic sensor for detecting a magnetic field of the first magnetic pattern; a second magnetic sensor for detecting a magnetic field of the second magnetic pattern; and a signal processing circuit for calculating an absolute rotation angle of a rotation shaft based on output signals of the first and second magnetic sensors. The first and second magnetic sensors and the signal processing circuit are fixed to a single substrate. The first magnetic pattern is formed on a plane extending in a direction crossing an axial direction inside the permanent magnet, and the second magnetic pattern is formed on an outer peripheral surface of the permanent magnet.
    Type: Application
    Filed: March 19, 2012
    Publication date: January 16, 2014
    Applicant: ORIENTAL MOTOR CO., LTD
    Inventors: Masayuki Someya, Yoshio Hirasawa, Sakao Ozeki