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3-Degree of Freedom Flex Cable Design to Facilitate Sub-Assembly Shock Isolation; Including a Direct Access Storage Device Unit

IP.com Disclosure Number: IPCOM000106835D
Original Publication Date: 1993-Dec-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 87K

Publishing Venue

IBM

Related People

Khanna, VD: AUTHOR [+3]

Abstract

Disclosed is the design for a flex cable connector that permits large relative motions in all three directions. It thus provides enhanced functionality compared to traditional flex cable connectors where free movements are possible in only two out of the three directions. This is most valuable in small Direct Access Storage Devices (DASD) which use shock isolators for protection.

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3-Degree of Freedom Flex Cable Design to Facilitate Sub-Assembly Shock Isolation; Including a Direct Access Storage Device Unit

      Disclosed is the design for a flex cable connector that permits
large relative motions in all three directions.  It thus provides
enhanced functionality compared to traditional flex cable connectors
where free movements are possible in only two out of the three
directions.  This is most valuable in small Direct Access Storage
Devices (DASD) which use shock isolators for protection.

      Small form factor DASDs are being used in environments that are
exposed to potential high shock inputs.  To be able to withstand
these forces the DASDs are mounted on shock isolators that are
visco-elastic in nature and which attenuate the shocks by
deformation.  The resulting compression or expansion of the isolators
results in a relative movement of the DASD, with respect to its
mounting frame, called sway.  This necessitates that the cable
connecting the DASD to the outside world be flexible in nature,
hence, the use of 'Flex' cable connectors.

      A traditional flex connector is shown in Fig. 1.  A thin
flexible cable is shaped into an inverted U between two connectors as
shown.  The material of the cable is generally a polyimide since that
allows definition of the conductor lines with simple lithographic
techniques.  Such materials are relatively hard plastics and so the
cable will not easily undergo shear deformations and will bend easily
only about an axis perpendicular to its thickness direction.  Due to
this the connectors are free to move relative to each other only in
the X and Z directions because such movements cause changes in
bending about an easy axis.  Relative movements in the Y direction
require a shear deforma...