Coil component, circuit board arrangement, electronic device, and method of manufacturing coil component
A coil component includes an element body, a conductor, and at least one outer electrode. The element body has a first face and a second face. The first face is adjacent or continuous to the second face. The conductor is provided inside and/or on a surface of the element body. The outer electrode is electrically connected to the conductor. The outer electrode includes a first base electrode layer, a second base electrode layer, and a metal layer. The first base electrode layer is formed on the first face of the element body. The second base electrode layer is formed on the second face of the element body and at least partly spaced apart from the first base electrode layer. The metal layer continuously covers the first base electrode layer and the second base electrode layer.
1 . A coil component comprising:
an element body having a first face and a second face, the first face being adjacent or continuous to the second face, and a ridge region connecting the first face and the second face;
a conductor provided inside and/or on a surface of the element body; and
an outer electrode electrically connected to the conductor, the outer electrode including:
a first base electrode layer formed on the first face of the element body,
a second base electrode layer formed on the second face of the element body and at least partly spaced apart from the first base electrode layer,
a plurality of third base electrode layers provided on the ridge region of the element body between the first base electrode layer and the second base electrode layer, wherein the plurality of third base electrode layers are at least partly spaced apart from the first base electrode layer and the second base electrode layer, and
a metal layer that continuously covers the first base electrode layer and the second base electrode layer.
2 . The coil component according to claim 1 , wherein the second face is a bottom face that opposes a substrate when the coil component is mounted on the substrate, the first face is an end face, and a length of the metal layer in its extending direction from the bottom face to the end face is shorter on the end face than on the bottom face.
3 . The coil component according to claim 1 , wherein the metal layer has a higher metal packing fraction than the first, second, and third base electrode layers.
4 . The coil component according to claim 1 , wherein the metal layer includes a nickel layer continuously covering the first and second base electrode layers, and a tin layer covering the nickel layer, and the tin layer is thinner than the nickel layer.
5 . The coil component according to claim 1 , wherein the outer electrode includes a conductive resin layer provided between the metal layer and at least one of the first base electrode layer and the second base electrode layer.
6 . A circuit board arrangement comprising:
a coil component set forth in claim 1 ; and
a substrate on which the coil component is mounted by solder bonding, the solder bonding extending over an end face of the outer electrode.
7 . An electronic device comprising the circuit board arrangement set forth in claim 6 .
8 . A method of manufacturing the coil component set forth in claim 1 , the method comprising:
forming a rugged shape at a portion bordering the first face and the second face of the element body;
applying a material for a base electrode layer over the first face and the second face of the element body in which the rugged shape has been formed; and
simultaneously as or after the applying of the material, forming the first base electrode layer and the second base electrode layer that are at least partly spaced apart from each other.
9 . A method of manufacturing the coil component set forth in claim 1 , the method comprising:
applying a material for a base electrode layer over the first face and the second face of the element body; and
forming the first base electrode layer and the second base electrode layer that are at least partly spaced apart from each other, by reducing the material applied at a portion bordering the first face and the second face.
10 . The coil component according to claim 1 , wherein the ridge region is a rounded edge, and the plurality of third base electrode layers are provided on the rounded edge.
11 . The coil component according to claim 1 , wherein a gap between adjacent third base electrode layers is no more than five times a thickness of the metal layer.
12 . The coil component according to claim 1 , wherein a gap between adjacent third base electrode layers is no more than twice a thickness of the metal layer.
13 . The coil component according to claim 1 , wherein the ridge region has recess portions recessed inward, and the plurality of third base electrode layers are provided in the recess portions.