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Browse Prior Art Database

Aluminum Actuator Coil Connection to Flexible Circuits

IP.com Disclosure Number: IPCOM000099562D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

Tomlin, JE: AUTHOR [+2]

Abstract

Manufacturing problems occur when it is necessary to connect aluminum conductors of a component, such as a coil, to copper circuitry on the user equipment. Soldering aluminium is difficult due to the presence of surface oxides that require the use of aggresive fluxes which, in turn, produce toxic fumes. When assembly under clean room conditions are needed, as with the production of disk/head assemblies, generating noxious fumes is particularly undesirable and risky to the total reliability of the end product.

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Aluminum Actuator Coil Connection to Flexible Circuits

       Manufacturing problems occur when it is necessary to
connect aluminum conductors of a component, such as a coil, to copper
circuitry on the user equipment.  Soldering aluminium is difficult
due to the presence of surface oxides that require the use of
aggresive fluxes which, in turn, produce toxic fumes.  When assembly
under clean room conditions are needed, as with the production of
disk/head assemblies, generating noxious fumes is particularly
undesirable and risky to the total reliability of the end product.

      This disclosure describes a production method that avoids the
above problem when connecting aluminum actuator coil leads to copper
conductors on a flexible circuit. Referring to the figure showing the
three stages A, B, C, the actuator coil has a copper interposer 1
ultrasonically welded 5 to exposed aluminum connection 2.  This gives
the coil connection end a copper interface 1 with which to make a
copper 1 to copper 3 solder joint 4 using conventional production
soldering means.