Dell Products Inc.

Richard Worley

Leroy Jones, Jr

Steve L Williams

James Don Curlee

Jason Alan Shepherd

Darren Burke Pav

Lisa Maria Sura

Steven L Williams

Satish Pratapneni

Chase Berry

A heat sink retention apparatus includes a base member and a heat sink mount including a pivotal base coupler and a board mounting member, whereby the heat sink mount is operable to mount to a board by engaging the pivotal base coupler with the base member and engaging the board mounting member with the board. A cable routing member and a connector storage member may be included on the heat sink mount for the routing of cables and the storing of connectors. A card retention device may be provided which is operable to couple to the heat sink mount and engage a card to retain the card on the board.

Method and apparatus for heat sink and card retention

A technique for reducing electromagnetic interference (EMI) in electronic systems that provides a phase shift between signals having a common frequency component propagating on adjacent portions of circuit board signal traces. The phase shift is produced by a delay element in one of the adjacent signal traces. In one example, the delay element includes a serpentine delay located at the signal generating circuit side of the adjacent portion of the signal trace. Such a technique can be used to reduce EMI emissions from clock signals provided to RAM circuits of a system memory of a computer system.

Signal trace phase delay

A computer chassis includes a metal chassis base portion and a metal chassis top portion. A pivotal connection is provided between the top portion and the base portion for movement of the top portion between an open position and a closed position with the base portion. A tongue and groove edge connection extends between the top portion and the base portion. An adhesive free gasket is mounted in the groove for sealing engagement with the tongue.

Tongue and groove gasket seam for EMI

A computer system including a number of option bays that accommodate optional peripheral equipment, such as CD-ROM drives, DVD drives, magnetic tape backup systems and Zip drives. An unpopulated bay is segmented into compartments by a divider that extends through substantially the entire depth of the bay so that each of the compartments operates as a waveguide beyond frequency cutoff (WBFC). The resulting compartments are characterized by cross-sectional dimensions that are less than the cross-sectional dimensions of the bay, so that the compartmentalization effects substantially enhanced attenuation of electromagnetic signals having a frequency at the highest expected operating frequency of the computer system.

EMI attenuation obtained by application of waveguide beyond frequency cutoff techniques for add-in ITE mass storage devices

A chassis discontinuity seal includes a gasket member comprising a compressible material with an interruption on its peripheral surface and a flexible sealing material spanning the interruption. The gasket member is placed on a first surface for sealing engagement with a mating closure surface. The compressible material has a first density and the interruption defines an elongated portion of the gasket having a second density, less than the first density. The gasket may be used in any shielding enclosure where it is desirable to reduce the compression force while maintaining high surface conductivity.

Wrapped multiple density gasket

An EMI gasket ( ) includes a plurality of serrations ( ) along at least one edge ( ). The serrations ( ) are arranged side-by-side so that each may be articulated individually. That is, one of the serrations ( ) may be displaced significantly out of the plane of the gasket without affecting adjacent serrations. Thus, when the edge of the gasket ( ) is compressed between two surfaces which include a discontinuity ( ) such as a step or protuberance between them, the serration in contact with the discontinuity is displaced out of the plane of the gasket without displacing adjacent portions of the gasket. Allowing a portion of an EMI gasket ( ) to be displaced out of the plane of the gasket without affecting adjacent portions of the gasket substantially reduces or eliminates gaps which occur due to the failure of the gasket to precisely follow the contour of a component.

Growing community of inventors

Cedar Park, TX, United States of America

Richard Worley