Patents by Inventor Mitsuji Arai

Mitsuji Arai 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).

  • Motor driving device
    Patent number: 8159176
    Abstract: A motor-driving device comprising: a switching element to control a current passed through a first coil of a stepping motor including the first and a second coils electromagnetically coupled; a rectifier element to be energized in a ground-side-to-second-coil direction; a coil-current-detection unit to detect a current passed through the first coil; a regeneration-current-detection unit to detect a current passed through the rectifier element; a control unit to turn off the switching element when the current passed through the first coil reaches a predetermined-set current based on a detection result of the coil-current-detection unit; and a negative-current-detection unit to detect whether a negative current greater in absolute value than a predetermined-set value is passed through the rectifier element based on a detection result of the regeneration-current-detection unit, the control unit keeping the switching element off when the negative current is not passed, based on a detection result of the negative-
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: April 17, 2012
    Assignees: Sanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
    Inventors: Mitsuji Arai, Takeshi Oike
  • MOTOR DRIVING DEVICE
    Publication number: 20110025251
    Abstract: A motor-driving device comprising: a switching element to control a current passed through a first coil of a stepping motor including the first and a second coils electromagnetically coupled; a rectifier element to be energized in a ground-side-to-second-coil direction; a coil-current-detection unit to detect a current passed through the first coil; a regeneration-current-detection unit to detect a current passed through the rectifier element; a control unit to turn off the switching element when the current passed through the first coil reaches a predetermined-set current based on a detection result of the coil-current-detection unit; and a negative-current-detection unit to detect whether a negative current greater in absolute value than a predetermined-set value is passed through the rectifier element based on a detection result of the regeneration-current-detection unit, the control unit keeping the switching element off when the negative current is not passed, based on a detection result of the negative-
    Type: Application
    Filed: August 13, 2010
    Publication date: February 3, 2011
    Applicants: SANYO ELECTRIC CO., LTD., SANYO SEMICONDUCTOR CO., LTD.
    Inventors: Mitsuji Arai, Takeshi Oike