Browse Prior Art Database

Assembly Fixture for Magnetic Read/Write Head Suspension Assemblies

IP.com Disclosure Number: IPCOM000101417D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 6 page(s) / 243K

Publishing Venue

IBM

Related People

Barenboim, M: AUTHOR [+5]

Abstract

A mechanism is described whereby a tooling assembly fixture for magnetic read/write head suspension assemblies is used to hold wires in place during ultrasonic placement of wires onto conductive pads of a magnetic read/write head. The fixture also holds the magnetic head in place relative to a suspension assembly during an epoxy-bonding procedure.

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This is the abbreviated version, containing approximately 34% of the total text.

Assembly Fixture for Magnetic Read/Write Head Suspension Assemblies

       A mechanism is described whereby a tooling assembly
fixture for magnetic read/write head suspension assemblies is used to
hold wires in place during ultrasonic placement of wires onto
conductive pads of a magnetic read/write head.  The fixture also
holds the magnetic head in place relative to a suspension assembly
during an epoxy-bonding procedure.

      In prior art, head suspension assemblies were built with the
magnetic head and the suspension assembly held together for bonding
in a nest.  The resulting assembly was then removed and located on
critical datum surfaces for ultrasonic bonding of wires to conductive
pads of the magnetic head.  Next, the assembly was removed and placed
on a third fixture for routing the wiring harness and to crimp tabs
used to hold the harness in place.  The process involved additional
labor whenever the assembly was removed and placed in another
fixture.  This additional handing exposed the sensitive parts to
potential damage and produced dimensional inaccuracies which may
affect proper functioning of the part.  The concept described herein
provides a fixture to overcome these difficulties.  In addition, the
design holds the magnetic head and suspension subassembly in a fixed
relationship for bonding and curing operations, holds the wires
adjacent to conductive pads located on the magnetic head for
ultrasonic bonding operations, facilitates the routing and placement
of the wiring harness and the crimping of surfaces, and supports and
maintains relationships among the parts as they are moved among
various process stations.

      In the drawings: Fig. 1 shows the head suspension assembly, the
product to be manufactured using the fixture described herein; Fig. 2
shows the fixture with the head suspension assembly in place; Fig. 3
shows the portion of the fixture and the head suspension assembly
around the area where the wires are ultrasonically attached to pads
on the magnetic head; Fig. 4 is a cross-sectional top view of the
fixture, showing the means to clamp the magnetic head and the
suspension subassembly in place relative to each other.

      The assembly fixture is used to assemble suspension assembly 1,
as shown in Fig. 1, and consists of several parts welded together,
including flexible spring 2.  This assembly process involves
attaching flexible spring 2 to magnetic head 3 using epoxy adhesive
and attaching wires 4 to conductor pads 5, which are located on
magnetic head 3. Wires 4 are part of wiring harness 6 which is routed
through "U"- shaped structure 7 and held in place by crimped tabs 8.
In order to attain proper subsequent functionality, the dimensional
relationship between the location of magnetic head 3 and location
holes 9 and 10 must be accurately preserved.

      Suspension assembly 1 is placed onto fixture block 20, as shown
in Fig. 2, using locating pins 21 and 22 and position locatin...