Method and apparatus for operating a capacitive tactile keyboard

Details Method and apparatus for operating a capacitive tactile keyboard Method and apparatus for operating a capacitive tactile keyboard

1993-04-21

1996-06-11

Coles, Sr., Edward L.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, 341 34, H03K 1794, H03M 1100

Patent

active

055259804

ABSTRACT:
A method and apparatus for determining a valid selection of a capacitance tactile keyboard as a function of a selection state and validation state of the keyboard. The selection state is determined from measured capacitive values of each key by during a first phase of a cycle. The validation state is determined from measured pressure on the keyboard, for certain key selection states only, during a second phase of the cycle.

REFERENCES:
patent: 4211915 (1980-07-01), Miller et al.
patent: 4441097 (1984-04-01), Anderson
patent: 4550221 (1985-10-01), Mabusth
patent: 5012124 (1991-04-01), Hollaway

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