Keyboard apparatus having ghost key sensing function

Details Keyboard apparatus having ghost key sensing function Keyboard apparatus having ghost key sensing function

1990-01-03

1993-06-15

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 26, H03M 1120

Patent

active

052203239

ABSTRACT:
A keyboard apparatus includes a key matrix having key switches disposed at intersections between rows and columns forming a matrix and a control unit for selecting a row and a column of the key matrix to sense a state of a key switch disposed at an intersection of the selected row and the selected column of the key matrix. The apparatus includes a first confirmation unit for sensing, in a first period of time, a key switch state of the key matrix to confirm whether or not two or more depressed keys exist on a row of the key matrix and a second confirmation unit for sensing again, in a second period of time, a key switch state of the key matrix such that when two or more depressed keys exist on a column of the key matrix, a confirmation is made to determine whether or not two or more depressed keys exist on the row on which the key depression is found in the key matrix. The apparatus temporarily reserves, when the first and second confirmation units confirm that two or more depressed keys exist both of the column and the row of the key matrix, a depression processing of a key switch associated with the depressed keys.

REFERENCES:
patent: 4106011 (1978-08-01), Melanson et al.
patent: 4420744 (1983-12-01), Jesson
patent: 4888600 (1989-12-01), Anderson et al.

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