Inductance device

An inductance device, comprising:

• a laminated body including a plurality of insulators and a plurality of patterned conductors that are alternately stacked, wherein the laminated body has a bottom surface, a top surface opposite to the bottom surface, a first side surface, and a second side surface opposite to the first side surface, the first and second side surfaces are both connected between the bottom surface and the top surface, and each of the patterned conductors in the laminated body is located at an interface between two adjacent ones of the insulators and extends along a surrounding trace;
• a plurality of conductive fillers distributed in the plurality of insulators, wherein each of the conductive fillers passes through a corresponding one of the insulators along a thickness direction thereof so as to connect two adjacent ones of the pattered conductors and form a coiled conductor that extends spirally;
• and
• a first external electrode and a second external electrode respectively formed at the first side surface and the second side surface of the laminated body, wherein an inner surface of the first external electrode is connected to an uppermost one of the patterned conductors, and an inner surface of the second external electrode is connected to a lowermost one of the patterned conductors;
• wherein an outer surface of the first external electrode is exposed at the bottom surface and the first side surface of the laminated body, an outer surface of the second external electrode is exposed at the bottom surface and the second side surface of the laminated body, and the inner surfaces of the first and second external electrodes are curved surfaces.