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Electrostatic Discharge Screen Print Ink

IP.com Disclosure Number: IPCOM000122144D
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 44K

Publishing Venue

IBM

Related People

Lamont, RM: AUTHOR

Abstract

Disclosed is an electro-static discharge (ESD) protection method, employed at the circuit carrier level, that dispenses with the need for users to take extra precautions or use external devices during manufacture or servicing. Semiconductor materials are tailored to suitable resistivity values and incorporated on the printed circuit board or flex laminate.

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This is the abbreviated version, containing approximately 71% of the total text.

Electrostatic Discharge Screen Print Ink

      Disclosed is an electro-static discharge (ESD) protection
method, employed at the circuit carrier level, that dispenses with
the need for users to take extra precautions or use external devices
during manufacture or servicing. Semiconductor materials are tailored
to suitable resistivity values and incorporated on the printed
circuit board or flex laminate.

      Electrostatic charge can damage electronic parts.  This method
permits the elimination of such charge on circuit carriers by
providing a static-dissipative path between the conductors of
electronics circuit carriers, such as PCBs, flexes, ceramics and flat
cables.  The paths are through a common connective covering of paint
or selective patterns of printed ink.

      Conductive carbon-filled and metal-filled paints are well
known, but their resistance is less than that required for this new
method.  The paint or ink has a resistance low enough to dissipate
static charges but high enough to allow proper circuit functions.
This provides a static-dissipating path between conductors of an
electronic or electrical circuit, where such path is provided by
means of a paint containing a partially conductive filler, such that
in the finished state, the paint exhibits a resistance between the
conductors of more than 1 megohm but less than 1000 megohms.  The
specification for such requirements is not available from
conventional conductive fillers.

      The p...