Coil component and method for making coil component
A coil component includes an exterior body, a coil, and a pair of terminal electrodes. The coil is disposed inside the exterior body. The pair of terminal electrodes are electrically connected to the coil and are disposed on the exterior body. The exterior body includes a first portion that covers the coil and is made of a resin, and a second portion including a side surface on which the pair of terminal electrodes are disposed. The second portion includes a material having a relative permittivity lower than a relative permittivity of the resin and is disposed between the coil and the pair of terminal electrodes.
1. A coil component comprising:
an exterior body;
a coil disposed inside the exterior body; and
a pair of terminal electrodes electrically connected to the coil and disposed on the exterior body,
wherein the exterior body includes a first portion that covers the coil and is made of a resin, and a second portion on which the pair of terminal electrodes are disposed, and
the second portion includes a material having a relative permittivity lower than a relative permittivity of the resin and is disposed between the coil and the pair of terminal electrodes.
2. The coil component according to claim 1 ,
wherein the coil includes a wire,
the wire includes a first wire portion having a spiral shape, and a pair of second wire portions,
each of the pair of second wire portions is continuous with a corresponding terminal electrode of the pair of terminal electrodes, and
each of the terminal electrodes has a flat plate shape.
3. The coil component according to claim 2 ,
wherein the second portion includes a flat side surface on which the pair of terminal electrodes are disposed,
each of the second wire portions includes an inner portion disposed inside the exterior body, and an outer portion disposed on the exterior body and continuous with the corresponding terminal electrode, and
the inner portion extends in a direction intersecting the side surface, and the outer portion extends in a direction along the side surface.
4. The coil component according to claim 2 , wherein the wire includes a conductor and a coating layer covering the conductor and having electrical insulation.
5. The coil component according to claim 1 , further comprising a core portion disposed inside the coil,
wherein the core portion is made of a resin.
6. A method for making a coil component, the method comprising:
preparing a coil;
forming an exterior body to cover the coil; and
disposing a pair of terminal electrodes electrically connected to the coil on the exterior body,
wherein the forming step comprises forming a first portion covering the coil with a resin, and forming a second portion on which the pair of terminal electrodes are to be disposed with a predetermined material,
the disposing step comprises disposing the pair of terminal electrodes on the exterior body such that the second portion is disposed between the coil and the pair of terminal electrodes, and
the predetermined material has a relative permittivity lower than a relative permittivity of the resin.
7. The method according to claim 6 ,
wherein, the preparing step comprises preparing the coil made of a wire, and
the method further comprises forming the pair of terminal electrodes continuous with the wire through pressing both end portions of the wire before the disposing step.