Multiple key array

Details Multiple key array Multiple key array

1994-05-02

1996-07-09

Peng, John K.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 26, H03M 1120

Patent

active

055348602

ABSTRACT:
An apparatus for and method of scanning a key array (101-116) uses two or three scan lines (134 and 135 or 308, 309, and 310), thereby limiting the need for an excessive number of input/output lines of a processor (136). A separate resistor ladder (301,302, 303) is provided for each dimension of keys, including row, column, and/or matrix. A minimal number of parts is also required to implement the resistor ladder (301,302, 303). A reference conductor (311), a row conductor (312), a column conductor (313), and, if desired, a matrix conductor (314) each run under each key, such that when a different key is depressed, a unique combination of voltages appears at the scan lines (134 and 135 or 308, 309, and 310) for the resistor ladders (301, 302, 303).

REFERENCES:
patent: 4222038 (1980-09-01), Magerl
patent: 4616213 (1986-10-01), Danish
patent: 5057836 (1991-10-01), Inaba
patent: 5265274 (1993-11-01), Knutson et al.

Affiliated with

Also associated with

Rating

Multiple key array does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiple key array, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple key array will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1870154