Key output method for keyboards

Details Key output method for keyboards Key output method for keyboards

1988-11-23

1990-05-01

Oberley, Alvin

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 24, 341 26, G06F 302

Patent

active

049222481

ABSTRACT:
A keyboard with N-key rollover has a matrix of key columns and lines for successively issuing key codes for depressed keys. When first and second keys on the same column are detected as being depressed and then a third key on the same line as one of the first and second keys is detected as being depressed, or when first and second keys on the same line are detected as being depressed and then a third key on the same column as one of the first and second keys is detected as being depressed, a key code for the third key or a key code for a fourth key detected in error upon depression of the third key are prevented from being issued.

REFERENCES:
patent: 3493928 (1970-02-01), Juliusberger
patent: 3745536 (1973-07-01), Klehm
patent: 4106011 (1978-08-01), Melanson et al.
patent: 4231016 (1980-10-01), Ueda
patent: 4420744 (1983-12-01), Tesson
patent: 4581603 (1986-04-01), Ingold et al.
Bland and Bolt, "Phantom Key Detection/Phantom Key Scan Code", IBM Technical Disclosure Bulletin, vol. 27, No. 7A, Dec. 1984.
"Solution to Phantom Key Problems", IBM Technical Disclosure Bulletin, vol. 28, No. 5, Oct. 1985.

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