Patents by Inventor Keizi Ishizuka

Keizi Ishizuka 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).

  • Patent number: 5051688
    Abstract: A meter driving device for indicating angular positions corresponding to input values. The device includes a memory for storing previously given input values, angular directions corresponding to the input values, and coefficients representative of the grades of change in angular direction depending on the change between adjacent two input values, as parameters. Based on these parameters and the frequency of input pulse signal giving the input values, the angular direction corresponding thereto is calculated. The angular direction signal receives PWM process and then supplies to a pair of crossed exciting coils via a driver. During a predetermined time period from the turning ON and OFF of the power source, the transference of the angular direction signals to the driver is shut out by logic gates, thereby inhibiting malfunctional meter indication.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: September 24, 1991
    Assignees: Rohm Co., Ltd., Kanto Seiki Co., Ltd.
    Inventors: Hiroshi Murase, Keizi Ishizuka, Masakazu Kobayashi, Masanori Narita