Data input device having switch matrix scanning means

Details Data input device having switch matrix scanning means Data input device having switch matrix scanning means

1988-05-13

1989-08-01

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

34082579, 400479, H03M 1100, G06F 302

Patent

active

048536954

ABSTRACT:
A data input device having key switches which are temporarily in an operated position, and position-hold switches each having selectable stable positions. The device includes a first matrix, a second matrix, and a matrix scanning arrangement. The first matrix comprises first and second signal lines which cross each other, and the second matrix comprises third and fourth signal lines which cross each other. Each key switch is connected between the first and second lines at a corresponding one of the intersections. Similarly, each position-hold switch is connected between the third and fourth lines at a corresponding one of the intersections. Some of the first or second lines are used as the third or fourth lines. The matrix scanning arrangement scans the first matrix to determine whether each key switch as been operated, and scans the second matrix to determine the selected stable positions of each position-hold switch, only when a scanning of the first matrix indicates that the number of the key switches which have been operated is not greater than a reference value.

REFERENCES:
patent: 4149096 (1979-04-01), Holzner et al.
patent: 4398181 (1983-08-01), Yamamoto
patent: 4599608 (1986-07-01), Matsuoka
patent: 4675653 (1987-06-01), Priestley
patent: 4684275 (1987-08-01), Matsushita et al.

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