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Positive Pressure Keyboard Contamination Shield

IP.com Disclosure Number: IPCOM000050144D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Passafiume, JE: AUTHOR

Abstract

One of the major causes of keyboard malfunction in capacitive keyboards is dust and dirt particles and other contaminative particles which are introduced over a period of time into the keyboard enclosure. The contaminative particles will eventually position themselves on the pad card such that they prevent the pivot plates of the key modules from being pivoted into the necessary close proximity to the pad card and thus cause a malfunction of the keyboard.

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Positive Pressure Keyboard Contamination Shield

One of the major causes of keyboard malfunction in capacitive keyboards is dust and dirt particles and other contaminative particles which are introduced over a period of time into the keyboard enclosure. The contaminative particles will eventually position themselves on the pad card such that they prevent the pivot plates of the key modules from being pivoted into the necessary close proximity to the pad card and thus cause a malfunction of the keyboard.

A technique for preventing the particles from entering the keyboard is disclosed herein. Pressurized air is conducted from the fan housing 10 of the motor 12 through an appropriate conduit 14 and introduced into the chamber 16 of the keyboard 18. This pressurized air will, of necessity, have to be filtered before being passed through the chamber 16 of the keyboard 18 and will exit through the chimneys 20 on the top of the keyboard 18. The chimneys 20 normally are to support the key stems 22 and keybuttons 24 for reciprocal movement. With the positive pressure within the chamber 16 of the keyboard 18, the air flow will be outward from the chimneys 20 and will thus tend to expel any particles which may be positioned such that keybutton depression would aid their entry into the chamber 16 of the keyboard 18.

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