| 摘要 |
PURPOSE:To manufacture coils correctly, in large quantities and rapidly, to enable the manufacture of toroidal coils and so on, and to contrive the shortening of the manufacturing time and the improvement of the yield of the coils by a method wherein such a conductive metal as copper is adhered on core materials by such a means as electrolytic plating and plated parts are formed on this metal by a photo etching method lik as a conductive wire is wound on. CONSTITUTION:Core materials 1 for forming a bobbin are put in an electroplating tank the necessary number of pieces only and a conductive coat 2 consisting of copper and so on is formed on the peripheries of the core materials 1 by electrolytic plating. Then, a photo resist film 3 is coated on the coat 2 and unexposed parts 4 are formed for forming a coil pattern 5. The unnecessary copper is etched by treating these parts by a photo etching method, the photo resist film is removed and a one-layer coil is formed. Then, when the number of turns of coil is numerously necessitated, the width of the pattern 5 is formed narrowly or a coating of insulator is performed on the coil pattern 5 and the coil can be formed in multilayer by performing again a photo etching method.
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