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Browse Prior Art Database

Thermal Expansion Isolating Stiffener for Hardfile Actuator Electronics Assembly

IP.com Disclosure Number: IPCOM000110653D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Tufty, LR: AUTHOR [+2]

Abstract

The actuator assembly of a multi-platter magnetic media disk file must be both mechanically and thermally stable in order to achieve satisfactory performance for soft and hard error rates, to achieve high linear track densities, and to satisfy the product environmental operating requirement

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This is the abbreviated version, containing approximately 52% of the total text.

Thermal Expansion Isolating Stiffener for Hardfile Actuator Electronics Assembly

       The actuator assembly of a multi-platter magnetic media
disk file must be both mechanically and thermally stable in order to
achieve satisfactory performance for soft and hard error rates, to
achieve high linear track densities, and to satisfy the product
environmental operating requirement

      When the flexcable/electronics assembly is attached to the
actuator, mechanical connections are established between the two
elements.  Each of these elements have unique thermal
expansion/contraction coefficients which are dissimilar with respect
to one another as a consequence of material selection limitations.
As a result, under the influence of either local or global heat
dissipation within the disk enclosure of the file, the expansion and
contraction of one assembly in response to temperature changes can
exert forces which distort the other.  These distortions can result
in displacements of the read/ write heads relative to the data tracks
with which they are associated, resulting in degraded performance as
a consequence of track misregistrations and error recovery
procedures.

      The flexcable stiffener design described here provides a
technique of decoupling the mechanical stiffness associated with
registering the flex/electronics assembly down against the mounting
surface of the actuator from that which responds to and transmits
forces associated with thermal expansion and contraction of the
flexcable/electronics assembly as electrical power is dissipated
within the associated electrical modules or as the surrounding
environmental temperature changes.  This...