Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1989-02-02
1991-10-22
Fleming, Michael R.
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
341 24, 341 26, 400477, 400479, 364900, 364928, H03M 1100, G06F 302, H04L 100, G08C 2500
Patent
active
050599747
ABSTRACT:
A method of determining a phantom key condition in an encoder array (10) including (1) enabling each row (R1-R14) of the encoder to a high position; (2) pulling the first row (R1) to be scanned to a low position; (3) scanning the first row (R1) of which in the low position finding whether there is a first key being closed, (4) determining whether there is second key being closed in the first column (C2) of which the first key has been closed, if there isn't a second key being closed, then outputting the signal, if there is a second key being closed, then (5) determining whether there is a third key being closed in the second row of which a second key has been closed before, if there isn't a third key that exists, output the signal, if a third key exists in the second row, (6) then the phenomenon of a phantom exists and the inputting signals will be invalid and beeper sound is emitted to warn the typist.
REFERENCES:
patent: 4417824 (1983-11-01), Paterson et al.
patent: 4420744 (1983-12-01), Jesson
patent: 4633228 (1986-12-01), Larson
patent: 4794375 (1988-12-01), Morris et al.
patent: 4918444 (1990-04-01), Matsubayashi
patent: 4922248 (1990-05-01), Shiga
"Solution to Phantom Key Problems"-IBM Technical Disclosure Bulletin-vol. 28, No. 5, Oct./85-pp. 1914-1919.
Bolt et al.,-"Phantom Key Detection/Phantom Key Scan Code"-vol. 27, No. 7A, Dec/84-p. 4109.
Acer Incorporated
Fleming Michael R.
Ray Gopal C.
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