Patent ID: 6379755
Filing Date: 2002-04-30
Classification: C23C,H05K

Abstract:
A method for producing a cylindrical coil comprising the steps of:(i) imparting an electroless plating reaction catalyst to at least an outside surface of an insulation cylindrical substrate having a heat conductivity of 4.5 to 8.4 W/mÂ° C.; (ii) deactivating the electroless plating reaction catalyst in the form of a continuous winding on a side surface of the insulation cylindrical substrate by irradiating a predetermined portion of the electroless plating reaction catalyst by a laser beam, whereby groove portions are formed by removing a part of the substrate corresponding to the groove portions, from which the electroless plating reaction catalyst is removed, and the electroless plating reaction catalyst of sides of the groove portions are deactivated; (iii) applying an electroless plating solution to the insulation cylindrical substrate; and (iv) allowing the electroless plating reaction catalyst to react with an electroless plating solution.