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Computer keyboard systems and methods for determining excessive key stroke force

  • US 5,982,357 A
  • Filed: 03/12/1997
  • Issued: 11/09/1999
  • Est. Priority Date: 03/12/1997
  • Status: Expired due to Fees
First Claim
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1. A computer keyboard system comprising:

  • a plurality of keys arranged in a keyboard array, individual keys being capable of reciprocation by a keyboard operator through a keystroke range comprising an undepressed position and an actuation position;

    a plurality of keyswitches, individual keyswitches being operably associated with individual respective keys for generating a computer input signal when the keyboard operator applies an actuation force sufficient to move an individual key from the undepressed position to the actuation position, the actuation position corresponding to closure of an associated keyswitch;

    a keyswitch monitor operably connected with the plurality of keyswitches and configured to determine a keyswitch closure duration value upon closure of an associated keyswitch, the keyswitch monitor being further configured to generate an overpressure signal if the keyswitch closure duration value exceeds a predetermined threshold duration value for the associated keyswitch; and

    a sensory warning device operably connected with the keyswitch monitor and configured to receive the overpressure signal and responsive thereto warn the keyboard operator that excessive force has been applied to a key.

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