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Pre-Positioned Cable Bonding Scheme for Wire Terminations

IP.com Disclosure Number: IPCOM000115750D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 88K

Publishing Venue

IBM

Related People

Frater, N: AUTHOR [+3]

Abstract

An actuator cable is bonded to the actuator comb assembly with intentional slack at a corner so that the termination pads can be precisely aligned by three tooling features. Rectangular termination pads are laid out in rows to achieve the largest pads possible to accommodate alignment tolerances. The electrical leads from the read/write head are bonded onto a tail extension from the load beam so that when the head-gimbal assemblies are swaged to the actuator comb, the leads are pre-positioned to allow use of an automated soldering process for terminations.

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Pre-Positioned Cable Bonding Scheme for Wire Terminations

      An actuator cable is bonded to the actuator comb assembly with
intentional slack at a corner so that the termination pads can be
precisely aligned by three tooling features.  Rectangular termination
pads are laid out in rows to achieve the largest pads possible to
accommodate alignment tolerances.  The electrical leads from the
read/write head are bonded onto a tail extension from the load beam
so that when the head-gimbal assemblies are swaged to the actuator
comb, the leads are pre-positioned to allow use of an automated
soldering process for terminations.

      An actuator assembly is comprised of an aluminum comb, a cable
assembly and a plurality of head-gimbal assemblies using inductive
write transducer and magneto-resistive read transducer.  The Figure
shows an head-actuator assembly with twelve arms to receive twenty
four head-gimbal assemblies requiring ninety six electrical solder
terminations.

      In prior art, the cable assembly was wrapped around the
actuator comb, clamped and bonded with epoxy adhesive using heat and
pressure.  This process produced distortions of the cable and
adhesive which caused the termination pads to vary widely in position
relative to their nominal position.  Wires from each head-gimbal
assemblies had to be manually positioned to overlay the corresponding
cable termination pads prior to solder reflow termination.

      In the present design, the actuator cable assembly is wrapped
around the actuator comb with intentional slack at the corner of the
comb closest to the termination pads.  This permits the termination
pad area to be independently aligned using three tooling features:
the center slot in the cable located at the horizontal centerline of
the pads is oriented horizontally to control the pad pattern in the
vertical direction and...