Photo-optical keyboard having debris protection

Details Photo-optical keyboard having debris protection Photo-optical keyboard having debris protection

1979-09-14

1981-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340365P, G01D 534

Patent

active

042925169

ABSTRACT:
The invention relates to a photo-optical keyboard having an improved keyboard housing and keys for the purpose of confining debris and liquid spills on the keyboard. The keyboard housing has a matrix of rows and columns of apertures for keys. The housing has recesses open to the top of the keyboard between the apertures. Further, there are structural supports between the apertures which separate the recesses and cause the recesses to be reservoirs. Multiple keys are positioned in the keyboard housing apertures. Each of the keys has an umbrella cap with edges extending over the recesses. Liquid or debris spilled on the umbrella cap will fall into the recesses to be contained.

REFERENCES:
patent: 3761919 (1973-09-01), Baumann
patent: 3787837 (1974-01-01), Allen et al.

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