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Browse Prior Art Database

Disk Filtration System for Linear Actuators

IP.com Disclosure Number: IPCOM000102548D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Greaves, HR: AUTHOR

Abstract

The air in an enclosed magnetic disk file is filtered by means of a closed circuit circulating air flow. A construction is described that employs the centrifugal fan effect of the spinning data disks to power an air flow which is routed around the file in channels controlled by the geometry and shapes of the HDA components. The design efficiently minimizes contamination of heads and disks from linear arm actuator debris as well as enabling together with a high recirculation air rate for faster clean-up times.

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This is the abbreviated version, containing approximately 60% of the total text.

Disk Filtration System for Linear Actuators

       The air in an enclosed magnetic disk file is filtered by
means of a closed circuit circulating air flow.  A construction is
described that employs the centrifugal fan effect of the spinning
data disks to power an air flow which is routed around the file in
channels controlled by the geometry and shapes of the HDA components.
The design efficiently minimizes contamination of heads and disks
from linear arm actuator debris as well as enabling together with a
high recirculation air rate for faster clean-up times.

      Linear actuators in HDAs may generate particles which become
released into the enclosed space.   They must be trapped and removed
from the air flow soon after they are generated.  Fig. 1 is an
exploded view of a disk file with only the upper and lower disks 1 of
the disk stack shown for clarity with the disk clamps and spacers
omitted.  The disk stack 1 is mounted on a cylindrical hub 7 which
rotates anticlockwise viewed from above, by means of a motor (M in
Fig. 2) within it.

      As the disk surfaces rotate the centripetal force on the
surrounding air produces a pressure difference between the top of hub
7 and the periphery of the disks 1, which drives an air flow through
the linear actuator 2.  High pressure air (Ph in Fig. 2) via channel
10, passing through the actuator 2, carries particles away from the
disks and heads.  Air returns through a pair of filters 3 in molding
6 which ducts...