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METHOD OF SECURING PANELS TO EMI CABINETS

IP.com Disclosure Number: IPCOM000006680D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-23
Document File: 2 page(s) / 80K

Publishing Venue

Motorola

Related People

Malcolm Perry: AUTHOR

Abstract

The modem method of electronics enclosure man- ufacture utiliies extruded aluminum sections to form frames to which side and back panels are secured. The tixing of panels to frames can take many forms and most utilize EMI gasketing of some form or other. The aim is to provide electrical continuity on the inside surface of the cabinet to contain E field radiation. If the gasketing is incorrectly fitted the E field radiation will escape, reduc- ing the overall shielding effectiveness ofthe cabinet.

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INC. Technical Developments Volume 17 December 1992

METHOD OF SECURING PANELS TO EMI CABINETS

by Malcolm Perry

  The modem method of electronics enclosure man- ufacture utiliies extruded aluminum sections to form frames to which side and back panels are secured. The tixing of panels to frames can take many forms and most utilize EMI gasketing of some form or other. The aim is to provide electrical continuity on the inside surface of the cabinet to contain E field radiation. If the gasketing is incorrectly fitted the E field radiation will escape, reduc- ing the overall shielding effectiveness ofthe cabinet.

  In the drive to improve performance and reduce cost alternative methods of securing panels have been investigated and the following design evolved.

  So the use of flat panels can be used, the use of a supporting groove feature is added to the top, bottom and side structural members. The groove features are the principal part ofthe design.

  It can be seen in Figure 1 that the exterior side of the support groove is serrated and will travel the length of the extrusion. This feature is to minimize the chance of particle contamination forcing the panel away from the front of the extrusion. A secondary function would be to provide multiple contact edges on to the front face of the panel to give part off a labyrinth seal for EMI protection.

  The opposite side to this face has a radiused groove with a tapered lead in. When the cabinet is assembled with the panel loosely in position, a conductive flexible hollow 0 ring...