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Low Stiffness Flexure for Disk Drive Suspensions

IP.com Disclosure Number: IPCOM000118616D
Original Publication Date: 1997-Apr-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Arya, SP: AUTHOR [+2]

Abstract

Disclosed is a flexure design for conventional discrete wired suspension for use with the pico format slider (30% slider). This flexure design has the advantages of reduced pitch and roll stiffnesses, good pitch and roll static attitude control, and low manufacturing cost. Furthermore, it is the first existing flexure design that utilizes stainless steel below one mil thickness.

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Low Stiffness Flexure for Disk Drive Suspensions

      Disclosed is a flexure design for conventional discrete wired
suspension for use with the pico format slider (30% slider).  This
flexure design has the advantages of reduced pitch and roll
stiffnesses, good pitch and roll static attitude control, and low
manufacturing cost.  Furthermore, it is the first existing flexure
design that utilizes  stainless steel below one mil thickness.

      Fig. 1 shows the head gimbal assembly with the low stiffness
flexure.  Fig. 2 shows the low stiffness flexure alone.

      In order to reduce the pitch and roll stiffnesses which are
needed for pico slider (ABS) performance, the gimbal material
thickness was reduced from .0012 inch to .0007 inch.  Since gimbal
(flexure) stiffness is proportional to a cube of material thickness
for same configuration, this change in thickness achieved four times
reduction in  flexure material contribution to pitch stiffness.  As a
result, pitch static stiffness was reduced from 0.150 N-mm per radian
to 0.030 N-mm per radian.

      Standard 0.0014 inch diameter wires contribute significantly to
the pitch and roll stiffnesses of a flexure.  In order to reduce the
wire contribution, 0.001 inch diameter wires were used.  The result
is that  the final flexure pitch stiffness is reduced from 0.14 N-mm
per radian to  0.06 N-mm per radian.  Further reduction in wire
contribution was achieved by increasing the free length of wires t...