Scan circuit and method for keyboard

Details Scan circuit and method for keyboard Scan circuit and method for keyboard

2005-11-01

2005-11-01

Edwards, Jr., Timothy (Department: 2635)

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

C084S655000

Reexamination Certificate

active

06961008

ABSTRACT:
A keyboard scan circuit for a device receiving plural inputs simultaneously is provided. The scan circuit includes a plurality of keyboard input/output ports, each of which can be selected from a group consisting of an input mode, an output mode, and a floating mode for receiving one of a plural inputs, a plurality of rectangular matrices including a plurality of detectable input terminals and a plurality of synchronously detectable input terminals and formed by means of cross-linking the keyboard input/output ports, and a plurality of current-isolating elements electrically connected between the keyboard input/output ports and the rectangular matrices for mutually isolating signals of the rectangular matrices.

REFERENCES:
patent: 3746773 (1973-07-01), Uetrecht
patent: 3794748 (1974-02-01), Deutsch
patent: 3881390 (1975-05-01), Gullickson
patent: 5367119 (1994-11-01), Matsuda et al.
patent: 5541989 (1996-07-01), Wu et al.

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