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Stabilization of Lubricant Thickness in a Disk File

IP.com Disclosure Number: IPCOM000111834D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Foster, JS: AUTHOR [+2]

Abstract

Disclosed is a method and apparatus for continually maintaining a lubricant layer on a thin film disk file of between 100 and 300 angstrom thickness. A steady-state film thickness is achieved using a diffusion driven recirculating lubricant system.

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Stabilization of Lubricant Thickness in a Disk File

      Disclosed is a method and apparatus for continually maintaining
a lubricant layer on a thin film disk file of between 100 and 300
angstrom thickness.  A steady-state film thickness is achieved using
a diffusion driven recirculating lubricant system.

      Lubricant is applied to the Inner Diameter (ID) of the disk
from a dense filter material sandwiched between a first and second
disk and supported by a supportive fixture protruding from the
spindle.  The filter is impregnated with a liquid lubricant, e.g., a
4:1 mixture of Z-Dol and 854 lubricants.  During operation of the
file, a thin film of the lubricant is spun towards the Outer Diameter
(OD) where it is collected by the outer rim of the filter.  Return of
the lubricant to the ID of the disk takes place by diffusion through
the pores of the filter.

      Additional support of the filter is provided in the data zone
of each sandwiching disk by a second, lower density filter.  The
second filter is disposed between the first filter and the disk
surface.  Providing a second filter reduces drag between the disk
surface and the filter material without compromising transport
properties of the filter.  A narrow radial slit in the filter allows
for head positioning.

      A consistent lubricant thickness is maintained by appropriate
selection of filter material, the filter's geometry, and disk
velocity.  A number of filter geometries are possib...