To properly make conductive the conductive layers of the both sides of a conductive member for a non-contact type data carrier.
A raw material sheet configured by forming conductive layers 3c and 4a made of metallic foils on the both sides of an insulating base material 2 is placed on a heated base 6, and an ultrasonic vibrator 7 having a pressurizing part 7a shaped like a polygonal pyramid or a polygonal pyramid pedestal in which concave sections are formed in the metallic foil is heated so that the elongation at break of the metallic foil can not be exceeded, and brought into contact with the conductive layer 3c of the raw material sheet from the upper part of the base, and while an ultrasonic wave with transverse vibration is applied to the ultrasonic vibrator, the concave sections 5 are formed on the conductive layer by the pressurizing part, and the concave sections are welded through the insulating base materials to the opposite conductive layer 4a.
MASUBUCHI HIDEO
SHIMOMURA KIICHI
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