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Browse Prior Art Database

Static Dissipation Path for Standard Keyboards

IP.com Disclosure Number: IPCOM000116698D
Original Publication Date: 1995-Oct-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Sawdon, D: AUTHOR

Abstract

Some geographical areas have very low humidity levels. In order that a computer can be used without risk of static discharge in such areas the keyboard must provide a mechanism to remove any electrostatic charge that has built-up on the operator. The traditional way of achieving this requires special products and is not applicable to ungrounded (e.g., laptop) computers.

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Static Dissipation Path for Standard Keyboards

      Some geographical areas have very low humidity levels.  In
order that a computer can be used without risk of static discharge in
such areas the keyboard must provide a mechanism to remove any
electrostatic charge that has built-up on the operator.  The
traditional way of achieving this requires special products and is
not applicable to ungrounded (e.g., laptop) computers.

      The described solution is very simple and inexpensive.  A small
sheet of conductive, self-adhesive (possibly transparent) plastic is
made available to customers in regions of very low humidity.  This
sheet of plastic has a small connector attached to one end.  The
customer may cut the plastic to a suitable shape (if required) and
then stick it wherever is most appropriate (probably the front edge
of the keyboard).  A thin lead is provided to enable the conductive
sheet to be connected to an appropriate ground.  Either the connector
or the lead requires an integral resistance of between 10Mohms and
500Mohms to ensure that the peak discharge current is below a
perceptible level.