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Actuator Arm Design

IP.com Disclosure Number: IPCOM000123476D
Original Publication Date: 1998-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 26K

Publishing Venue

IBM

Related People

Tsuda, S: AUTHOR [+3]

Abstract

This article discloses a structure of the actuator arm in which the thickness of the arms are gradually changed so that the base or root of the arm is thicker than the tip or the head end of the arm is thinner to achieve the following benefits; 1. Reduction of inertia without impacting the mass. Therefore, an improvement in seek times. 2. Improvement in bending strength. 3. Improvement in resonance frequencies.

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Actuator Arm Design

    This article discloses a structure of the actuator arm in
which the thickness of the arms are gradually changed so that the
base or root of the arm is thicker than the tip or the head end of
the arm is thinner to achieve the following benefits;
  1.  Reduction of inertia without impacting the mass.  Therefore,
      an improvement in seek times.
  2.  Improvement in bending strength.
  3.  Improvement in resonance frequencies.

   The actuator in a HDD (hard disk drive) is driven by
the VCM (voice coil motor) so that the heads are accessible to an
arbitrary data track.  Higher stiffness is required for more accurate
accesses as well as low inertia for faster accesses.

   The conventional arms have even thickness from the root
to the tip.  To stiffen the arm by thickening it will result in a
mass impact.  The disclosed structure would have the arm gradually
reducing its thickness as shown in Fig. 1.  In this way, the bending
strength can be improved without mass increase.  The structure in
Fig. 1 shows step-by-step reduction of the thickness.  A continuous
change in the thickness (a taper shape) will also perform well.