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Electromagnetic Shield for Printers With Flat Printed Circuit Boards

IP.com Disclosure Number: IPCOM000065429D
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Sweat, RH [+details]

Abstract

An arrangement is described which provides a reduction of electromagnetic emissions from printers with flat circuit board layouts. Most attempts at solving electromagnetic compatibility (EMC) problems for printers are undertaken during a development verification test since this is the first time a reliable measure of the EMC problem can be made. However, since the printer is usually completely designed and soft-tooled at this point, the means for solving any EMC problems is limited. A typical solution is to paint the inside of the bottom cover (and occasionally the top cover) with a conductive paint. This process is expensive and usually adds several dollars to the cost of the machine. Another alternative considered has been the use of a metal lower cover pan, such as die cast aluminum. This is also an expensive solution.