Computer keyboard systems and methods for determining excessive

Details Computer keyboard systems and methods for determining excessive Computer keyboard systems and methods for determining excessive

1997-03-12

1999-11-09

Mengistu, Amare

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

345172, 341 22, G09G 500

Patent

active

059823577

ABSTRACT:
Computer keyboard systems and methods of determining excessive keystroke force or overpressure are described. A computer keyboard system 10 is illustrated having a keyboard array of keys 14. Individual keys 14 are capable of being reciprocated through a keystroke range which comprises an undepressed position and an actuation position. The keystroke range may also include an overtravel subrange. Individual keys 14 are operatively connected with individual keyswitches 32 which are activated thereby for providing informational signals to a keyboard microprocessor 54, 56. The microprocessor is configured to determine a keyswitch closure duration value and compare that value with a predetermined threshold duration value. If the closure duration value is greater than the predetermined threshold duration value, then an overpressure signal is produced which enables a sensory warning device 50, 52 to warn the keyboard operator that excessive force has been applied.

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