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Suspension Assembly with Geometrical Non-Linearity Damping Effect

IP.com Disclosure Number: IPCOM000114978D
Original Publication Date: 1995-Feb-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 79K

Publishing Venue

IBM

Related People

Aoyagi, A: AUTHOR [+3]

Abstract

Disclosed is a new Suspension Assembly design which has geometrical non-linearity damping effect used in Hard Disk Drives (HDDs).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Suspension Assembly with Geometrical Non-Linearity Damping Effect

      Disclosed is a new Suspension Assembly design which has
geometrical non-linearity damping effect used in Hard Disk Drives
(HDDs).

      The Suspension Assembly is one of the components used in HDDs.
It has some natural frequencies such as bending modes and torsional
modes
and so on.  If the magnitude of these mechanical resonance modes are
large, it affects Servo performance and degrades Error Rate.  In
order to
reduce the magnitude of these modes, a damping material sheet is
usually
put on the Load Beam.  It reduces the magnitude of these mechanical
resonance modes by Visco Elastic Damping Effect.

      There exists another way to reduce these mechanical resonance
modes.  That is Geometrical Non-linearity Damping Effect.  This is
the phenomena that non-linear geometries tend to have higher damping
than linear ones.
  Example 1 - The Hinge area of the Load Beam is formed in a
               V-shape or U-shape shown in Fig. 1 and not
cylindrically
               which is commonly used.
  Example 2 - The edge shape of the Mount Plate is not formed as a
line,
               such as curved, V-shape notched or waved shown in Fig.
2.
  Example 3 - The Mount Plate itself is formed not flat, such as
curved,
               V-shaped or waved partially shown in Fig. 3.
  Example 4 - The Spot Welding Points are not located in a line, suc...