Patents by Inventor Shunichi Iwaki

Shunichi Iwaki 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).

  • Drive control system for display devices
    Patent number: 4422365
    Abstract: Light-emitting diodes (LEDs) are provided for operation keys such as a tone select switch or performance keys of an electronic musical instrument. The display drive lines for the LEDs are arranged in the form of a matrix, and a dynamic drive signal is supplied to them. With these LEDs, the operation state of the operation keys is indicated. The LEDs are adapted to indicate the performance key to be operated next to the player.
    Type: Grant
    Filed: December 16, 1981
    Date of Patent: December 27, 1983
    Assignee: Casio Computer Co., Ltd.
    Inventor: Shunichi Iwaki