Patents by Inventor Hiroshi Osawa

Hiroshi Osawa 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).

  • Keyswitch structure
    Patent number: 4570039
    Abstract: In a keyswitch structure, a number of recesses are formed in a lower case, and a projection with a flat top surface is formed inside each of the recesses. The recesses communicate with each other by means of grooves formed on the lower case, and fixed contacts are provided on the projections. A pattern is formed on the under surface of a flexible substrate put on the lower case so that movable contacts, included in the pattern, face the fixed contacts. An elastic sheet with a number of buttons is put on the flexible substrate, and the flexible substrate and the elastic sheet are fixedly held between an upper case and the lower case. When any of the buttons of the elastic sheet is pushed, the elastic sheet and the flexible substrate are elastically deformed to bring the movable contacts into contact with the fixed contacts.
    Type: Grant
    Filed: July 23, 1984
    Date of Patent: February 11, 1986
    Assignee: Casio Computer Co., Ltd.
    Inventors: Hiroshi Osawa, Isao Kurashima, Yoshio Kawai