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Electromagnetic Shielding for Enclosure for Data Processing Apparatus Having Distributed Capacitance in Parallel with Conductive Gasket

IP.com Disclosure Number: IPCOM000050504D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Holzman, GR: AUTHOR [+2]

Abstract

A movable door of an enclosure for a data processing system is electrically coupled to the stationary frame of the enclosure by a distributed capacitor that parallels the conventional conductive gasket that is located between the door and the frame. The circuit of the capacitor and the resistor combine to better maintain the door at the same potential as the frame.

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Electromagnetic Shielding for Enclosure for Data Processing Apparatus Having Distributed Capacitance in Parallel with Conductive Gasket

A movable door of an enclosure for a data processing system is electrically coupled to the stationary frame of the enclosure by a distributed capacitor that parallels the conventional conductive gasket that is located between the door and the frame. The circuit of the capacitor and the resistor combine to better maintain the door at the same potential as the frame.

The enclosure of a data processing system forms a shield that prevents components of the system from radiating electromagnetic energy out of the enclosure and from receiving radiation from other sources. The shield is effective if it conducts easily and there are no apertures to prevent parts of the enclosure from remaining at the same potential. Conversely, if there are apertures, different parts of the enclosure can be at different potentials, and the corresponding electromagnetic field is transmitted through the aperture. The movable doors of the enclosure usually have a conductive gasket that seals the narrow aperture between the door and the frame. The resistance of the gasket tends to produce a different potential between the door and the frame and to thereby leak radiation through the enclosure.

The capacitor is formed by a metal spring structure that is mechanically and conductively connected along the edges of the door. When the door is closed, the spring brid...