Browse Prior Art Database

Electromagnetic Interference Shielding

IP.com Disclosure Number: IPCOM000047540D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Berry, OV: AUTHOR [+4]

Abstract

Radio frequency emissions inherent in electro-erosion printing on metallized paper are eliminated and confined by a shield 10 which covers the printing area of a printer 11. Metallized paper 12 passes from a supply roll within printer 11 past a printing station and exits a slot 13 in the cover shield 10. The paper moves over shield 10 and is held spaced from the surface of shield 10 by ribs 14. Radio frequency emissions resulting from the printing process within printer 11 are reduced by grounding contact with the metal surface of paper 12. The paper 12, however, tends to act as an antenna for propagating the emissions. Shield 10 is provided with a metallized external surface 15 which functions together with the metallized paper 12 as a capacitive filter to eliminate propagation of radio frequency interference signals.

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Electromagnetic Interference Shielding

Radio frequency emissions inherent in electro-erosion printing on metallized paper are eliminated and confined by a shield 10 which covers the printing area of a printer 11. Metallized paper 12 passes from a supply roll within printer 11 past a printing station and exits a slot 13 in the cover shield 10. The paper moves over shield 10 and is held spaced from the surface of shield 10 by ribs 14. Radio frequency emissions resulting from the printing process within printer 11 are reduced by grounding contact with the metal surface of paper 12. The paper 12, however, tends to act as an antenna for propagating the emissions. Shield 10 is provided with a metallized external surface 15 which functions together with the metallized paper 12 as a capacitive filter to eliminate propagation of radio frequency interference signals. The metallized surface 15 is preferably created by spatter coating chrome onto a polycarbonate plastic base.

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