Patents by Inventor Hideaki Idei

Hideaki Idei 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: 4794209
    Abstract: An apparatus suitable for measuring coordinate positions of points in a wide range of coordinate read area on a plane. The apparatus includes a cursor, a cursor drive circuit for supplying an alternate current signal to the cursor, a coordinate read device for detecting an induced magnetic field generated by a current flowing through the cursor and for generating a plurality of induced voltages, a change-over circuit connected to the coordinate read device, an induced voltage detect circuit connected to the change-over circuit for detecting a peak voltage of the plurality of induced voltages generated by the coordinate read device, a coordinate position detect circuit for effecting a calculation of a position of the cursor from the plurality of the peak voltages detected, and a control circuit for controlling the cursor drive circuit, the change-over circuit, the induced voltage detect circuit, and the coordinate detect circuit.
    Type: Grant
    Filed: May 28, 1987
    Date of Patent: December 27, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Akihiro Asada, Hideaki Idei