Coil component
In the coil component, the maximum reference surface height of the entire wall of the outermost wall and the innermost wall is the same as the reference surface height of the winding part of the coil, that is, equal to or less than the reference surface height of the winding part of the coil. In addition, in both the outermost wall and the innermost wall, the reference surface height of the second side surface is lower than the reference surface height of the winding part of the coil. In this case, in the vicinity of the upper surface of the outermost wall and the innermost wall, the magnetic flux toward the main surface side of the substrate is suppressed from being blocked by the outermost wall and the innermost wall, and the magnetic flux circulation is improved. Thus, the coil characteristics of the coil component are improved.
1. A coil component comprising:
a substrate;
a coil provided on a main surface of the substrate by plating and having a winding part having a uniform reference surface height with the main surface of the substrate as a reference surface;
a resin body provided on a main surface of the substrate and having a plurality of resin walls, the winding part of the coil extends between the plurality of resin walls;
a resin film integrally covering an upper surface of the coil and an upper surface of the resin body; and
a coating resin made of magnetic powder-containing resin, the coating resin integrally covers the coil, the resin body, and the resin film provided on the main surface of the substrate;
wherein the plurality of resin walls arranged on the main surface of the substrate include an outermost wall located at an outermost position, an innermost wall located at an innermost position, and an inter-wire wall interposed between the winding part of the coil;
wherein, in at least one of the outermost wall and the innermost wall, the maximum reference surface height of the entire wall is equal to or less than the reference surface height of the winding part of the coil, and the reference surface height of a second side surface opposite to a first side surface in contact with the winding part of the coil is lower than the reference surface height of the winding part of the coil.
2. The coil component according to claim 1 , wherein, in at least one of the outermost wall and the innermost wall, the reference surface height of the second side surface is lower than the reference surface height of the first side surface.
3. The coil component according to claim 2 , wherein an upper surface of at least one of the outermost wall and the innermost wall in which the reference surface height of the second side surface is lower than the reference surface height of the first side surface is inclined with respect to the main surface of the substrate.
4. The coil component according to claim 1 , wherein, in at least one of the outermost wall and the innermost wall, the reference surface height of the second side surface is the same as the reference surface height of the first side surface.
5. The coil component according to claim 1 , wherein the reference surface height of the inter-wire wall is the same as the reference surface height of the winding part of the coil, and the upper surface of the inter-wire wall and the upper surface of the winding part of the coil form a flat surface.
6. The coil component according to claim 1 , wherein the resin film has a uniform thickness on the winding part of the coil and on the inter-wire wall, and the uniform thickness is thinner than the thickness of the inter-wire wall.
7. The coil component according to claim 1 , wherein the thickness of the outermost wall is greater than the thickness of the inter-wire wall.
8. The coil component according to claim 7 , wherein the thickness of the outermost wall is 3 to 6 times the thickness of the inter-wire wall.