Patents Assigned to Datanetics Corporation
  • Contactless keyswitch for keyboards
    Patent number: 4117438
    Abstract: Inductive sensing keyswitch includes a printed circuit transformer and sheet of material having hinged metal flaps formed therein and each flap is resiliently biased against both printed circuit coils of the transformer for eddy-current shorting of both coils wherein keys on the keyboard have key stems passing through the printed circuit board between the printed coils and the flap hinges to provide a mechanical advantage for moving the flaps away from the printed circuit coils a greater distance than the short stroke movement of the key.
    Type: Grant
    Filed: April 13, 1977
    Date of Patent: September 26, 1978
    Assignee: Datanetics Corporation
    Inventors: Kirk J. Kim, Michael Muller