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Copper/Polyester Laminate As an Emi/Esd Shield

IP.com Disclosure Number: IPCOM000060186D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Grover, AC: AUTHOR [+4]

Abstract

Many electronic products use a shield of some type to provide electrostatic discharge (ESD) protection and to prevent electromagnetic interference (EMI). For protection purposes, some products use a steel or copper sheet and others have a metallic coating painted onto the base or cover of the product. The use of a copper/polyester laminate provides advantages over these other approaches. The laminate affords superior protection over the painting method, for example, is less costly as well as being easily automated. The copper/polyester laminate in the figure has copper on one side that provides the EMI protection and a polyester shield on the other side that protects against grounding of the logic card 6. As shown in the figure, the copper/polyester laminate 2 is positioned between the base 1 of the printer and logic card 6.

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Copper/Polyester Laminate As an Emi/Esd Shield

Many electronic products use a shield of some type to provide electrostatic discharge (ESD) protection and to prevent electromagnetic interference (EMI). For protection purposes, some products use a steel or copper sheet and others have a metallic coating painted onto the base or cover of the product. The use of a copper/polyester laminate provides advantages over these other approaches. The laminate affords superior protection over the painting method, for example, is less costly as well as being easily automated. The copper/polyester laminate in the figure has copper on one side that provides the EMI protection and a polyester shield on the other side that protects against grounding of the logic card 6. As shown in the figure, the copper/polyester laminate 2 is positioned between the base 1 of the printer and logic card 6. The polyester side of the laminate 2 faces logic card 6 to provide protection from grounding the card 6. The ground plane of the laminate 2 has two flaps 7 that are folded over so that the copper side of the ground plane is facing up at these two points. This allows the ground metal frame of the transformer 3 to make contact with the copper of the ground plane. The right side 4, which is made of conductive plastic material, of the printer makes contact with the ground plane as it is installed. The rubber bumpers 5 press the flaps 7 against the side plate 4 and the transformer 3 to insure good con...