Patents by Inventor Yuji Nao

Yuji Nao 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).

  • D.C. motor control circuit for radio controlled toy
    Patent number: 5065078
    Abstract: A control circuit for a DC motor which drives a radio controlled toy. The control circuit receives a signal whose pulse width contains information relating to the desired speed and direction in which the motor is to turn. If the pulse width is greater than a predetermined value, the control signal will be generated which causes the motor to turn in a forward direction, and if the pulse width is less than the predetermined value a control signal will be generated which causes the motor to turn in a reverse direction. The pulse width is also converted to a voltage level which is compared to a ramp wave with a frequency which is higher than the frequency of the received signal. The output of the comparator is a signal with a frequency which is higher than that of the received signal, allowing precise control of the motor in overcoming inertial forces applied against it.
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: November 12, 1991
    Assignee: Rohm Co., Ltd.
    Inventors: Yuji Nao, Koichi Yamazaki