Browse Prior Art Database

Universal Backpanel Shield

IP.com Disclosure Number: IPCOM000103500D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 57K

Publishing Venue

IBM

Related People

Koehnen, AJ: AUTHOR [+4]

Abstract

Electrical shielding of a backpanel is sometimes needed at/near the backpanel surface. This shielding is needed for electrical (frame or logic) grounding, and protection from Electromagnetic Radiation/Susceptibility (EMI) and Electrostatic Discharge (ESD). This design allows the use of closely spaced connectors of various sizes while maintaining shielding capability and shield manufacturability.

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Universal Backpanel Shield

      Electrical shielding of a backpanel is sometimes needed at/near
the backpanel surface.  This shielding is needed for electrical
(frame or logic) grounding, and protection from Electromagnetic
Radiation/Susceptibility (EMI) and Electrostatic Discharge (ESD).
This design allows the use of closely spaced connectors of various
sizes while maintaining shielding capability and shield
manufacturability.

      The backpanel shield is illustrated in the figure.  The
openings allow for large, closely spaced connectors.  Each vertical
strip of material between the openings carries electrical current
to/from the shield perimeter to the top of the formed 'fingers' which
contact auxiliary shielding (not shown).

      The fingers are tapered from bottom to top to prevent the
shield from 'hanging-up' on mechanically simple, punch-and-form
tools, and to provide a distributed stress across the length of the
cantilevered finger.

      The dual columns of fingers on each metal strip allow for
contact to multiple auxiliary shields between connectors, or
redundant/improved contact to a single auxiliary shield.

      After forming of the fingers, the metal strip has two
vertically uninterrupted conductors.  These conductors are laterally
interconnected physically and electrically.  This mechanically
becomes an 'I-beam' which provides lateral stiffness for tolerance
control.  The 'I-beam' electrically provides a large conductive path
f...