Browse Prior Art Database

Compact Chemical Breather Filter for Small Form Factor Direct Access Storage Devices

IP.com Disclosure Number: IPCOM000109650D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 3 page(s) / 105K

Publishing Venue

IBM

Related People

Cossette, LA: AUTHOR [+2]

Abstract

This article describes the design of a compact breather/make-up air filter for small form factor direct access storage devices (DASDs). The proposed filter design incorporates all of the features required for efficient removal of all contaminants, including organic and corrosive vapors, in the make-up air stream in a compact shape which can easily be implemented on disk drive form factors even below 2.5 inches. If the top cover seal of the filter gets punctured or develops some leak, the disk enclosure is not exposed to unfiltered air.

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Compact Chemical Breather Filter for Small Form Factor Direct Access Storage Devices

       This article describes the design of a compact
breather/make-up air filter for small form factor direct access
storage devices (DASDs).  The proposed filter design incorporates all
of the features required for efficient removal of all contaminants,
including organic and corrosive vapors, in the make-up air stream in
a compact shape which can easily be implemented on disk drive form
factors even below 2.5 inches. If the top cover seal of the filter
gets punctured or develops some leak, the disk enclosure is not
exposed to unfiltered air.

      The filter design incorporates all of the features required for
efficient removal of all contaminants in the make-up air stream in a
compact shape which can easily be implemented on disk drive form
factors even below 2.5 inches.  If the top cover seal of the filter
gets punctured or develops some leak, the disk enclosure is not
exposed to unfiltered air.

      The filter shape is essentially circular, with the filter
stages arranged concentrically.  The inlet and outlet diffusion
sections are at the perimeter of the filter, with the media section
in the center.  The filter body consists of molded plastic such as
polycarbonate.  The diameter of the filter body can be adjusted
depending on filtration requirements and space constraints.  A
thickness on the order of 2 mm can be achieved with commercially
available media.  The semi-circular diffusion channels are molded on
opposite sides of the filter body, thus separating the upstream and
downstream diffusion sections.  The filter media, which consists of a
packet containing a prefilter, carbon fabric treated with sodium
carbonate, and a high efficiency particulate media, is bonded in the
center of the filter body.  These three elements can be laminated
together for ease of assembly.  The high efficiency particulate media
must be adjacent to the ledge on the plastic filter body for sealing...