Browse Prior Art Database

Integrated Low Profile Suspension and Arm for Disk Files

IP.com Disclosure Number: IPCOM000115561D
Original Publication Date: 1995-May-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Ruiz, O: AUTHOR

Abstract

In a magnetic disk file, the actuator arm and its related pair of suspensions become a single piece weldment. In prior art, the pair of suspensions, the pair of mount plates and the arm are different pieces attached together. The single weldment proposed here eliminates suspension to arm attachment and therefore a low profile assembly is obtained that fits well in small disk spacing environment. The box construction of the arm allows for maximum rigidity and minimum weight, thus improving seek time and dynamic response. Power consumption is also reduced. If a planar laminate (steel, polyimide and copper layers) is used instead of plain steel, further integration including wires is possible.

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Integrated Low Profile Suspension and Arm for Disk Files

      In a magnetic disk file, the actuator arm and its related pair
of suspensions become a single piece weldment.  In prior art, the
pair of suspensions, the pair of mount plates and the arm are
different pieces attached together.  The single weldment proposed
here eliminates suspension to arm attachment and therefore a low
profile assembly is obtained that fits well in small disk spacing
environment.  The box construction of the arm allows for maximum
rigidity and minimum weight, thus improving seek time and dynamic
response.  Power consumption is also reduced.  If a planar laminate
(steel, polyimide and copper layers) is used instead of plain steel,
further integration including wires is possible.

      The suspension and the arm can be shaped in a planar view as
shown in Fig. 1-A.  Dotted lines are lines where sharp bends at 90
degrees are to be made.  Smaller bends are to be made across
suspension hinges to create preload.  A suspension and arm assembly
is formed by joining an upper and a lower suspension as shown in the
side view of Fig. 1-B.  Joining is effected preferably by spot
welding.  The box cross section shown in Fig. 1-C offers high bending
and torsional stiffness.  Mass and inertia are low due to the hollow
construction.  The torsional stiffness of the section is proportional
to the square of the enclosed area and to the thickness of the thin
wall.  In a 3.5" form factor rotary ...