Patents by Inventor Hiroshi Otawa

Hiroshi Otawa 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).

  • Stepper motor controlling apparatus and pen recorder
    Patent number: 7339342
    Abstract: A stepper motor controlling apparatus has a driver which drives a stepper motor in response to an input pulse signal, a PWM controlling section which changes a duty ratio of the pulse signal fed to the driver to control a rotation of the stepper motor, a pulse encoder which rotates in response to the rotation of the stepper motor, and outputs a pulse according to a position of a moving object, a position counter which counts the pulse output from the pulse encoder to sense a present position of the moving object, and a pulse rate controlling section which controls an update latency time of the pulse signal according to a deviation between a target position of the moving object and the present position.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: March 4, 2008
    Assignee: Yokogawa Electric Corporation
    Inventors: Naoyuki Harada, Hiroshi Otawa
  • Stepper motor controlling apparatus and pen recorder
    Publication number: 20060152187
    Abstract: A stepper motor controlling apparatus has a driver which drives a stepper motor in response to an input pulse signal, a PWM controlling section which changes a duty ratio of the pulse signal fed to the driver to control a rotation of the stepper motor, a pulse encoder which rotates in response to the rotation of the stepper motor, and outputs a pulse according to a position of a moving object, a position counter which counts the pulse output from the pulse encoder to sense a present position of the moving object, and a pulse rate controlling section which controls an update latency time of the pulse signal according to a deviation between a target position of the moving object and the present position.
    Type: Application
    Filed: December 14, 2005
    Publication date: July 13, 2006
    Inventors: Naoyuki Harada, Hiroshi Otawa