Magnetic core formed from laminations
AssigneeData Recording Instruments Limited
InventorsPeter C. Ridgway, Derek F. Case
Life of this patent
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Abstract
A method of bonding laminations of a magnetic core is disclosed in which photo-resist material consisting of a co-polymer is applied as a film to a sheet of magnetic material to define lamination shapes to enable the laminations to be formed by etching. The film of photo-resist material on the laminations is then utilized to bond the laminations together in a stack. In order to permit the core to operate at temperatures higher than the softening temperature of the photo-resist material, the bonded stack is irradiated to cause changes to the bonding material such that the material does not soften at the operating temperature of the core.
Claims6
A method of manufacturing a laminated magnetic core for operation at temperatures up to a predetermined temperature including the steps of providing a plurality of laminations of magnetic material;
- forming a film of a co-polymer on said laminations;
- said co-polymer being subject to softening at said predetermined temperature;
- assembling a stack of the laminations with the films of co-polymer interposed between said laminations and causing the films to bond the laminations together;
- and then subjecting the bonded stack to the effects of high energy radiation to produce a change in the co-polymer effective to result in the production of a material bonding the laminations which is not subject to softening at said predetermined temperature.
Dependencies are inferred from the claim text.