Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-09-14
1981-07-14
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
250229, G06F 302
Patent
active
042789656
ABSTRACT:
The invention relates to a photo-optical keyboard having an improved keyboard housing and keys to provide an N-key rollover feature. The keyboard is comprised of a keyboard housing and keys, and may have a baseplate. The key has a pair of grooves oriented along the axis for both columns and rows to allow the passage of light regardless if the key is in the up position or the depressed position. The keyboard further contains a reset feature to synchronize keyboard logic if it becomes unsynchronized when partial key depressions are made.
REFERENCES:
patent: 3465099 (1969-09-01), Harris
patent: 3579047 (1971-05-01), Sturm et al.
patent: 3614315 (1971-10-01), Glorioso
patent: 3648050 (1972-03-01), Koo
patent: 3668407 (1972-06-01), Matzen et al.
patent: 3796880 (1974-03-01), Dorey
Lane John E.
Mueller Harry B.
Nelson Edward I.
Burroughs Corporation
Chung Edmund M.
Groody James J.
Peterson Kevin R.
Rasmussen David G.
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