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EMC Ground Spring With Single And Dual Connectors On a Planar Board And A Single Connector in a DASD Frame Assembly

IP.com Disclosure Number: IPCOM000100975D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 7 page(s) / 218K

Publishing Venue

IBM

Related People

Cooke, KK: AUTHOR [+4]

Abstract

This article describes an electromagnetic current (EMC) grounding arrangement comprising multicontact EMC control for dual connectors on a two-faced planar board with surface-mounted components and on one side of a planar board and for a single connector on a one-sided planar board.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

EMC Ground Spring With Single And Dual Connectors On a Planar Board And A Single Connector in a DASD Frame Assembly

       This article describes an electromagnetic current (EMC)
grounding arrangement comprising multicontact EMC control for dual
connectors on a two-faced planar board with surface-mounted
components and on one side of a planar board and for a single
connector on a one-sided planar board.

      Referring to the drawings, Fig. 1 is a perspective view of a
system unit.  Fig. 2 is a detailed perspective view of a system unit
1 which includes a planar board 2 and a power supply 3 to which a
grounded bracket 4 is attached by a screw (not shown) operating
through slotted hole 5 of bracket 4.  This attachment electrically
grounds the bracket 4 to the power supply case forming a ground path
which is suitable for use both as a safety ground and as an
electromagnetic shielding ground.

      The planar board 2 includes a number of cable connectors 6 and
7 by means of which external devices (not shown), such as a printer
and a display unit, are attached to the system unit 1.  These
connectors 6 and 7 have conductive outer cases which in turn can form
an electrical ground to such externally connected cables.  The outer
cases are very helpful in the reduction of electromagnetic radiation
which may interfere with communications signals from a system
including externally cabled units.

      Fig. 3 is a detailed perspective view of the contact assembly.
The contact assembly 8 provides an electrical connection between
grounded bracket 4 and the outer cases of connectors 6 and 7.  It
consists of a flexible spring bracket 9 and a rigid shield guard 10.
A difference in flexibility is attained by making shield guard 10
from a material which is substantially thicker than that used for
flexible spring bracket 9.  Spring bracket 9 includes a plurality of
folded flexible tabs 11, which extend through the associated slots 12
in shield guard 10 when these parts are assembled, as shown in Fig.
4.  This configuration protects flexible tabs 11 from damage during
subsequent handling and assembly operations.

      When the contact assembly 8 is installed on the planar board 2,
the shells of connectors 6 extend through holes 13 and 14 of spring
bracket 9 and shield guard 10, respectively.  Spring bracket 9
includes short contact tabs 15, which are configured to contact these
connector shells.

      Similarly, when the contact assem...