Molded plastic photo-optical keyboard

Details Molded plastic photo-optical keyboard Molded plastic photo-optical keyboard

1979-09-14

1981-09-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G01D 534

Patent

active

042912253

ABSTRACT:
The invention relates to a photo-optical keyboard having an improved keyboard housing and keys. The keyboard housing is a molded plastic piece having a matrix of apertures for keys and a series of light channels passing between the apertures. The light channels open up to the underside of the keyboard housing. A spacing below the keyboard housing allows the keys in the apertures to overtravel and obstruct the light paths. Light isolation barriers beneath the keyboard housing prevent crossover of light between channels. The key is a molded plastic key with vertical slots to allow for passage of light in the undepressed state.

REFERENCES:
patent: 3056030 (1962-09-01), Kelchner
patent: 3648050 (1972-03-01), Koo
patent: 3796880 (1974-03-01), Dorey
patent: 3856127 (1974-12-01), Halfon et al.

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