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Circular Artwork

IP.com Disclosure Number: IPCOM000095408D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Dean, TN: AUTHOR [+4]

Abstract

A microminiature variable inductor is produced by depositing a magnetic coating on a central copper wire. There is then further deposited an encompassing coil around the structure to produce the inductor winding. The encompassing coil is produced by a photographic-etching procedure.

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Circular Artwork

A microminiature variable inductor is produced by depositing a magnetic coating on a central copper wire. There is then further deposited an encompassing coil around the structure to produce the inductor winding. The encompassing coil is produced by a photographic-etching procedure.

The artwork for the coil is produced by first coating copper tube 4 with a relatively heavy coating of industrial gold 6 (A). Then, as in B, a miniature lathe is used to scribe spiral pattern 8 into coating 6 so that the underlying copper is exposed in the machined areas. Tab areas 9 and 11 are left at either end of the coil for connective purposes. In C, copper tube 8 and gold coil 6 are then encapsulated in clear acrylic 10 through the use of either a shrinking or a molding process. The entire structure is then dipped into an etching fluid which etches out the copper tube while leaving gold spiral 6 unaffected (as in D).

To produce the inductor coil, a layer of copper is deposited on the magnetically coated wire. A photoresist coating is placed over the copper. The assembly is then inserted into the acrylic artwork. The photoresist is exposed by shining a light through the artwork onto the photoresist. Through the use of etching techniques, the coil is then produced.

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