Patents by Inventor Masashi Kameda

Masashi Kameda 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).

  • Power supply circuit for vacuum fluorescent display
    Patent number: 7088080
    Abstract: A power supply circuit for a vacuum fluorescent display includes a boosting coil, input terminal, switching transistor, PWM control circuit, boosting circuit, first filament terminal, and second filament terminal. The boosting coil is provided in a current path to generate an induced voltage in accordance with a change in current flowing therein. The input terminal receives a DC voltage to be applied to one terminal of the boosting coil. The switching transistor is provided between the other terminal of the boosting coil and a ground line. The PWM control circuit periodically turns on/off the switching transistor. The boosting circuit generates a boosted voltage on the basis of an induced voltage generated at the other terminal of the boosting coil when the switching transistor is switched from ON to OFF. The first terminal is connected to the node between the other terminal of the boosting coil and the switching transistor.
    Type: Grant
    Filed: August 19, 2004
    Date of Patent: August 8, 2006
    Assignees: Noritake Co., Ltd., Noritake Itron Corporation
    Inventors: Masashi Kameda, Kazuhisa Shibata, Hiroshi Nakanishi, Shinichi Terakami, Toshihide Eguchi
  • Power supply circuit for vacuum fluorescent display
    Publication number: 20050046402
    Abstract: A power supply circuit for a vacuum fluorescent display includes a boosting coil, input terminal, switching transistor, PWM control circuit, boosting circuit, first filament terminal, and second filament terminal. The boosting coil is provided in a current path to generate an induced voltage in accordance with a change in current flowing therein. The input terminal receives a DC voltage to be applied to one terminal of the boosting coil. The switching transistor is provided between the other terminal of the boosting coil and a ground line. The PWM control circuit periodically turns on/off the switching transistor. The boosting circuit generates a boosted voltage on the basis of an induced voltage generated at the other terminal of the boosting coil when the switching transistor is switched from ON to OFF. The first terminal is connected to the node between the other terminal of the boosting coil and the switching transistor.
    Type: Application
    Filed: August 19, 2004
    Publication date: March 3, 2005
    Inventors: Masashi Kameda, Kazuhisa Shibata, Hiroshi Nakanishi, Shinichi Terakami, Toshihide Eguchi