Coil component
A coil component is capable of suppressing occurrence of peeling at an interface between a coil conductor and resin in a magnetic portion due to heating during mounting. The coil component includes an element body that includes a coil conductor formed by winding a conductive wire coated with an insulating film, and a magnetic portion that contains metal magnetic particles and resin, and external electrodes that are electrically connected to exposed surfaces of extended portions of the coil conductor exposed on a surface of the element body, and are arranged on the surface of the element body. The metal magnetic particles are arranged in recesses formed in a surface of the conductive wire in the extended portions of the coil conductor.
1. A coil component comprising:
an element body that includes:
a coil conductor configured by winding a conductive wire coated with an insulating film, and
a magnetic portion that contains metal magnetic particles and resin; and
external electrodes that are electrically connected to exposed surfaces of extended portions of the coil conductor, the exposed surfaces being exposed on a surface of the element body, and the external electrodes being provided on the surface of the element body,
wherein
the metal magnetic particles are arranged in recesses in a surface of the conductive wire in the extended portions of the coil conductor.
2. The coil component according to claim 1 , wherein
insulating film removed portions, that are absent the insulating film, are provided at the extended portions of the coil conductor, and
the recesses are in the insulating film removed portions, and the metal magnetic particles are arranged thereon.
3. The coil component according to claim 2 , wherein
the insulating film removed portions and the external electrodes are directly connected.
4. The coil component according to claim 1 , wherein
the metal magnetic particles are coated with an insulating film.
5. The coil component according to claim 4 , wherein
in the metal magnetic particles in contact with the external electrodes, an average thickness of the insulating films of the metal magnetic particles that are in contact with the external electrodes is thinner than an average thickness of the insulating films of the metal magnetic particles that are not in contact with the external electrodes.
6. The coil component according to claim 1 , wherein
irregularities are on a surface of the exposed surfaces of extended portions of the coil conductor.
7. The coil component according to claim 1 , wherein
indented portions are in the element body on peripheries of the exposed surfaces of extended portions of the coil conductor, such that an average distance between the coil conductor and the magnetic portion is increased in a direction in which the coil conductor is extended to the surface of the element body.
8. The coil component according to claim 1 , wherein
a groove having a depth of from 5 μm to 100 μm is in the exposed surface of extended portions of the coil conductor.
9. The coil component according to claim 1 , wherein
the external electrodes are plating electrodes.
10. The coil component according to claim 2 , wherein
the metal magnetic particles are coated with an insulating film.
11. The coil component according to claim 3 , wherein
the metal magnetic particles are coated with an insulating film.
12. The coil component according to claim 2 , wherein
irregularities are on a surface of the exposed surfaces of extended portions of the coil conductor.
13. The coil component according to claim 3 , wherein
irregularities are on a surface of the exposed surfaces of extended portions of the coil conductor.
14. The coil component according to claim 4 , wherein
irregularities are on a surface of the exposed surfaces of extended portions of the coil conductor.
15. The coil component according to claim 5 , wherein
irregularities are on a surface of the exposed surfaces of extended portions of the coil conductor.
16. The coil component according to claim 2 , wherein
indented portions are in the element body on peripheries of the exposed surfaces of extended portions of the coil conductor, such that an average distance between the coil conductor and the magnetic portion is increased in a direction in which the coil conductor is extended to the surface of the element body.
17. The coil component according to claim 3 , wherein
indented portions are in the element body on peripheries of the exposed surfaces of extended portions of the coil conductor, such that an average distance between the coil conductor and the magnetic portion is increased in a direction in which the coil conductor is extended to the surface of the element body.
18. The coil component according to claim 2 , wherein
a groove having a depth of from 5 μm to 100 μm is in the exposed surface of extended portions of the coil conductor.
19. The coil component according to claim 3 , wherein
a groove having a depth of from 5 μm to 100 μm is in the exposed surface of extended portions of the coil conductor.
20. The coil component according to claim 2 , wherein
the external electrodes are plating electrodes.