Patents by Inventor Hiroshi Ichijyo

Hiroshi Ichijyo 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).

  • Voltage difference measuring equipment
    Patent number: 4843307
    Abstract: A peak to peak or two-point voltage difference measuring equipment according to the present invention comprises: a control circuit; a D/A converter for converting the digital data given from the control circuit into the reference analog voltage; a comparator for comparing an input voltage signal with a reference analog voltage; means for gating the output of the comparator for a predetermined time segment interval; and means for holding the output of the gating means and applying to the control circuit.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: June 27, 1989
    Assignee: Kabushiki Kaisha Kenwood
    Inventor: Hiroshi Ichijyo
  • Sweep circuit for oscilloscope
    Patent number: 4812717
    Abstract: The oscilloscope sweeping circuit includes a first D/A converter which converts sweep rate step digital data into a charge current under the weighting of a reference current applied thereto. The charge current charges a capacitor and the amount of the charge determines the sweep rate. The reference current is produced by a second D/A converter which converts fine step digital data into an analog current.
    Type: Grant
    Filed: April 29, 1987
    Date of Patent: March 14, 1989
    Assignee: Kabushiki Kaisha Kenwood
    Inventor: Hiroshi Ichijyo