Coil component and method of manufacturing the same
A coil component includes a body part containing a magnetic material, a coil part disposed in the body part, and an electrode part disposed on the body part. The coil part includes a support member, a first coil layer disposed on at least one surface of the support member, a first insulating layer stacked on at least one surface of the support member and covering the first coil layer, and a second coil layer disposed on the first insulating layer. The first and second coil layers are electrically connected to each other, and the second coil layer has a larger number of coil turns than the first coil layer. Additionally or alternatively, a conductor of the first coil layer has an aspect ratio less than 1. Methods of manufacturing such coil components are also provided.
1. A coil component comprising: a body part containing a magnetic material; a coil part disposed in the body part; and an electrode part disposed on the body part, wherein the coil part includes a support member, a first coil layer directly disposed on at least one surface of the support member, a first insulating layer stacked on at least one surface of the support member, having a composition different from the support member, and covering the first coil layer, and a second coil layer directly disposed on the first insulating layer, and the first and second coil layers are electrically connected to each other, and the second coil layer has a larger number of coil turns than the first coil layer; wherein the first coil layer includes a coil pattern having an aspect ratio less than 1, and the second coil layer includes a coil pattern having an aspect ratio exceeding 1.
2. The coil component of claim 1 , wherein the first and second first coil layers are each disposed on a respective surface of opposing surfaces of the support member,
first and second first insulating layers are each disposed on a respective surface of the opposing surfaces of the support member, and each cover a respective first coil layer of the first and second first coil layers,
the first and second coil layers are each disposed on a respective first insulating layer of the first and second first insulating layers,
first vias penetrating through the first and second first insulating layers electrically connect the first and second first coil layers to the first and second coil layers, and
a second via penetrating through the support member electrically connects the first and second first coil layers respectively formed on opposing surfaces of the support member to each other.
3. The coil component of claim 1 , wherein the coil pattern of the first coil layer includes a single turn, and the coil pattern of the second coil layer includes a plurality of turns.
4. The coil component of claim 1 , wherein a ratio (y/x) of y to x is greater than or equal to 2, in which the number of turns of the coil pattern of the first coil layer is x and the number of turns of the coil pattern of the second coil layer is y.
5. The coil component of claim 1 , wherein a ratio (H/T) of H to T is less than or equal to 0.15 in which T is a thickness of the body part and H is a thickness of the support member.
6. The coil component of claim 1 , wherein the magnetic material contains a plurality of magnetic metal powder particles having different average particle sizes and a resin mixture.
7. The coil component of claim 1 , wherein at least one lead cross section of the coil part includes a lead cross section of the support member, a lead cross section of the first insulating layer disposed on the lead cross section of the support member, and a lead cross section of the second coil layer disposed on the lead cross section of the first insulating layer.
8. The coil component of claim 7 , wherein the at least one lead cross section of the coil part has a tapered shape.
9. The coil component of claim 1 , wherein
the second coil layer includes another coil pattern having an aspect ratio less than 1.
10. The coil component of claim 9 , wherein the coil pattern of the first coil layer includes a single turn, and
the another coil pattern of the second coil layer includes a single turn.
11. The coil component of claim 1 , wherein the first coil layer includes another first coil pattern having an aspect ratio exceeding 1, and
the coil pattern of the second coil layer includes plural coil patterns having an aspect ratio exceeding 1.
12. The coil component of claim 11 , wherein the coil pattern of the first coil layer includes a plurality of turns, and
the coil pattern of the second coil layer includes a plurality of turns.
13. The coil component of claim 11 , wherein a line width of the second coil pattern disposed in an outermost portion of the first coil layer is wider than a line width of the first coil pattern disposed in an inner portion of the first coil layer.
14. The coil component of claim 11 , wherein an interval between turns of the coil patterns of the first coil layer is wider than an interval between turns of the coil patterns of the second coil layer.
15. A coil component comprising:
a body part containing a magnetic material;
a coil part disposed in the body part; and
an electrode part disposed on the body part,
wherein the coil part includes a support member, a first coil layer disposed on one surface of the support member, a first insulating layer stacked on the one surface of the support member and covering the first coil layer, and a second coil layer disposed on the first insulating layer, and
the first and second coil layers are electrically connected to each other, a conductor of the first coil layer has an aspect ratio h 1 /w 1 less than 1 where a thickness h 1 is measured orthogonally to the one surface of the support member on which the first coil layer is disposed and a width w 1 is measured parallel to the one surface of the support member, and a conductor of the second coil layer has an aspect ratio h 2 /w 2 exceeding 1 where a thickness h 2 is measured orthogonally to the one surface of the support member on which the first coil layer is disposed and a width w 2 is measured parallel to the one surface of the support member.
16. The coil component of claim 15 , wherein the coil part further includes a third coil layer disposed on another surface of the support member opposite to the one surface, a second insulating layer stacked on the other surface of the support member and covering the third coil layer, and a fourth coil layer disposed on the second insulating layer, and
the third and fourth coil layers are electrically connected to each other and to the first and second coil layers, and the third coil layer has an aspect ratio h 2 /w 2 less than 1 where a thickness h 2 is measured orthogonally to the other surface of the support member on which the third coil layer is disposed and a width w 2 is measured parallel to the other surface of the support member.
17. The coil component of claim 15 , wherein the second coil layer includes a lead portion connecting the coil part to an external electrode of the electrode part, and wherein a width of the lead portion measured parallel to the one surface of the support member is greater than a width of the support member disposed below the lead portion.
18. The coil component of claim 15 , wherein the first coil layer disposed on the one surface of the support member has a plurality of coil turns, and the conductor of the first coil layer has a first width in a first coil turn of the first coil layer and a second width different from the first width in a second coil turn of the first coil layer.
19. The coil component of claim 15 , wherein the second coil layer has a larger number of coil turns than the first coil layer.
20. The coil component of claim 19 , wherein the second coil layer has more than one coil turn within the width w 1 of the conductor of the first coil layer.