Photo-optical keyboard providing tactile feel

Details Photo-optical keyboard providing tactile feel Photo-optical keyboard providing tactile feel

1979-09-14

1981-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

4004913, G01D 534

Patent

active

042925177

ABSTRACT:
The invention relates to a photo-optical keyboard having an improved keyboard housing and keys to provide a tactile feel to the keyboard. The keyboard housing is a molded plastic piece having a matrix of rows and columnsof apertures for keys. Each of the apertures has ridges on the interior surface. The keys are each shaped to the apertures. Each key further has flexible fingers on its sidewalls. The flexible fingers have ridges thereon. The ridges on the flexible fingers make contact with the ridges on the inside surface of the aperture during the key depression to provide a tactile feel.

REFERENCES:
patent: 3822776 (1974-07-01), Pratt
patent: 3882295 (1975-05-01), Madland
patent: 4013342 (1977-03-01), Narodny

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