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Browse Prior Art Database

Permeation Limiting Gasket for Direct Access Storage Device

IP.com Disclosure Number: IPCOM000115592D
Original Publication Date: 1995-May-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Chainer, TJ: AUTHOR [+3]

Abstract

The disclosed invention consists of coupling a permeation barrier with an elastomer seal to inhibit permeation of contaminates into the Head-Disk-Assembly (HDA) of a Direct Access Storage Device (DASD), without significantly increasing the clamping force used in the assembly. In particular, the invention is applicable for limiting water permeation through the elastomeric gasket used.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Permeation Limiting Gasket for Direct Access Storage Device

      The disclosed invention consists of coupling a permeation
barrier with an elastomer seal to inhibit permeation of contaminates
into the Head-Disk-Assembly (HDA) of a Direct Access Storage Device
(DASD), without significantly increasing the clamping force used in
the assembly.  In particular, the invention is applicable for
limiting water permeation through the elastomeric gasket used.

      The simplest embodiment of the invention is the formation of
the permeation barrier by metalizing the surface of the elastomeric
seal, as shown in Fig. 1.  Here, the metallic barrier comprises of
several thousand angstroms of metal deposited on to Butyl or Viton
gasket (widely commercially available).  Metal may be applied with a
number of techniques such as sputtering.  The restoring force and
conformability of the elastomer would not be significantly
compromised by the presence of the thin metal coating.  A second
embodiment, improving the durability of the metal film on the gasket,
is achieved by encapsulating the structure in a conformal coating of
Parylene*.  This is shown in the same Fig. 1.  A third embodiment,
shown in Fig. 2, is achieved by a metallized Mylar or a flexible
membrane envelope which surrounds an elastomeric gasket.  In this
embodiment, the Mylar is used for its superior properties in
supporting the metal film and the restoring force is obtained by a
traditional elastomeric material.

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