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An L Shaped Particulate Filter for Sealed Disk Drives

IP.com Disclosure Number: IPCOM000110219D
Original Publication Date: 1992-Oct-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 1 page(s) / 41K

Publishing Venue

IBM

Related People

Tzeng, HM: AUTHOR

Abstract

The subject disclosure describes a filter that maximizes the rate of filtered airflow to the critical head-disk interface. The operation of the filter takes advantage of a unique characteristic of the disk flow that is the maximal attainable pressure differential in a disk drive equals to that across the inner and outer radii between disks. Therefore, the maximal filtration flow rate is achieved when the filter medium is exposed to such a pressure drop. To attain the maximal flow rate, the L-shaped filter, shown in the figure below, is devised. The L-filter has a main body (1) that is to be placed outside, but in proximity, to the disk stack (4). The main body contains filter medium (3) to remove particles in the flow. The flow-facing side of the main body serves as the flow entrance of the filter medium.

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An L Shaped Particulate Filter for Sealed Disk Drives

      The subject disclosure describes a filter that maximizes the
rate of filtered airflow to the critical head-disk interface.  The
operation of the filter takes advantage of a unique characteristic of
the disk flow that is the maximal attainable pressure differential in
a disk drive equals to that across the inner and outer radii between
disks.  Therefore, the maximal filtration flow rate is achieved when
the filter medium is exposed to such a pressure drop.  To attain the
maximal flow rate, the L-shaped filter, shown in the figure below, is
devised.  The L-filter has a main body (1) that is to be placed
outside, but in proximity, to the disk stack (4).  The main body
contains filter medium (3) to remove particles in the flow.  The
flow-facing side of the main body serves as the flow entrance of the
filter medium.  An orifice on the sidewall adjacent to the disk stack
is the flow discharge.  Attached to the discharge orifice is a hollow
extension piece (2) which is to be inserted between the disks at a
location upstream of the arm/slider assembly.  An aperture at the far
end of the extension piece discharges the filter airflow close to the
head-disk interface (5).  This approach ensures the head-disk
interface exposed to filtered clean air flow only.

      Disclosed anonymously.