Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Reexamination Certificate
2006-10-17
2006-10-17
Wong, Albert K. (Department: 2612)
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
C341S020000, C345S168000
Reexamination Certificate
active
07123170
ABSTRACT:
A system and method for scanning a data-input array (e.g., a keyboard or keypad) using a reduced number of signals is disclosed. Specifically, a switch array is disclosed comprising a plurality of switches and a plurality of input/output (I/O) lines. The switch array is arranged in an N*N matrix. A plurality of N I/O lines is used to scan the matrix. In one embodiment, the switches in the array are arranged in an N*(N−1)/2 configuration. In this configuration, there is no duplication of circuit paths. In another embodiment, the switches in the array are arranged in an N(N−1) configuration. In this configuration, a plurality of diodes are used to identify an activated switch depending upon which of a plurality of signal paths is activated. The plurality of diodes is included to differentiate between pairs of switches that complete the same paths between pairs of I/O lines.
REFERENCES:
patent: 4277780 (1981-07-01), Sonderman et al.
patent: 4583092 (1986-04-01), Saito
patent: 4906993 (1990-03-01), Freeman et al.
patent: 5856794 (1999-01-01), Chang
National Semiconductor Corporation
Wong Albert K.
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