RFI/EMI reduction for head and disk assembly

Details RFI/EMI reduction for head and disk assembly RFI/EMI reduction for head and disk assembly

1991-03-25

1993-02-16

Severin, David J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

174 35GC, 174 35R, 360 9703, G11B 3314, H05K 900

Patent

active

051876213

ABSTRACT:
Apparatus providing improved RFI/EMI shielding includes a base of conductive material, such as cast or forged aluminum alloy, the base defining a substantially continuous floor and integrally formed base sidewalls extending upwardly from the floor along the periphery thereof. The base sidewalls define an inset-stepped region above an upper outer peripheral ledge extending around the periphery of the base sidewalls. A plurality of closely spaced apart, knife-blade protrusions formed along the edge extend upwardly from the ledge and angle inwardly toward the base sidewalls within the inset-stepped region. A cover, substantially congruent with the base defines a ceiling and integral cover sidewalls extending downwardly to fit closely over the inset-stepped region so as to come into engagement with the knife-blade protrusions. A clamping arrangement, such as plural spaced apart screws passing through peripheral openings of the cover and entering threaded bores in the base for example, cause the cover securely to clamp down over the base such that facing portions of the cover are deformed over the knife-blade protrusions of the base, thereby establishing very low impedance, closely spaced apart contacts along the gap between the cover and base, for grounding out RFI/EMI.

REFERENCES:
patent: 1855447 (1929-01-01), Hagstedt
patent: 2065651 (1936-12-01), Burton
patent: 2604507 (1952-07-01), Tyson
patent: 4567317 (1986-01-01), Ehrlich et al.
patent: 4717990 (1988-01-01), Togcu
patent: 5014160 (1991-05-01), McCoy, Jr.
Mesh EMI Gasketing Selection Guide 174-35CG.

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