Patents by Inventor Jo Kudo

Jo Kudo 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: 6078151
    Abstract: In a dynamic focus circuit for a CRT, a first saw wave generating circuit generates a first saw wave signal in reponse to a horizontal synchronization signal, and a first amplifier amplifies the first saw wave signal with a first gain. Also, a first differential amplifier, amplifies the difference in voltage between the output signal of the first amplifier and a first reference voltage signal, and a first multiplier, calculates a square value of the output signal of the first differential amplifier to generate a horizontal parabolic signal. Similarly, a vertical parabolic signal is generated by a second saw wave circuit, a second amplifier, a second differential amplifier and a second multiplier. The horizontal parabolic signal and the vertical parabolic signal are added by an adder to generate a focus control signal.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: June 20, 2000
    Assignee: NEC Corporation
    Inventor: Jo Kudo