Photo-optical keyboard having n-key rollover

Communications: electrical – Audible indication – Percussion-type sound producer

Patent

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Details

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

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