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The above depicted method of fabricating and attaching a flexible cable to a magnetic head assembly eliminates jumper wires and results in higher density elements and a decrease in failure rates.
English (United States)
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Flexible Cable Fabrication and Termination Process
The above depicted method of fabricating and attaching a flexible cable to a
magnetic head assembly eliminates jumper wires and results in higher density
elements and a decrease in failure rates.
In Fig. 1, a cable 2, consisting of a flexible woven backing 4, clad with copper
6, is prepared for direct attachment to a magnetic head by first forming window 8
in the cable. This window is formed by removing the backing material down to
the copper, as shown in the figure.
A photoresist mask pattern 9, having an opening of the desired shape of the
final conductors, is then established on the copper side of the cable, as shown in
Fig. 2. The copper exposed by the opening of the mask is plated with gold, along
with the copper exposed on the bottom side by window 8. The photoresist is
A strip of supportive material, such as MYLAR*, is placed in window 8 to
support the tab portions of conductors 10, and the unplated copper is etched
away in a conventional manner.
The gold plating is then chemically removed, leaving discrete conductors 10
terminating in cantilevered tabs 12 (Fig. 3).
The remainder of the backing material surrounding window 8 is removed, and
the tabs 12 are cleaned, fluxed and tinned. Tabs 12 can then be reflow soldered
directly to the electrodes of head 16, as shown in Fig. 4. * Trademark of E. I. du
Pont de Nemours and Company
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