Coil component and electronic device

Patent metadata

Field	Value
Publication number	US-10755849-B2
Application number	US-201816183511-A
Country	US
Kind code	B2
Filing date	Nov 7, 2018
Priority date	Apr 27, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

In an exemplary embodiment, a coil component includes: a core 10 having a pillar part 24 , and a hollow space 22 around the pillar part 24 ; a coil conductor 40 having a spiral part 42 placed around the pillar part 24 , and a lead part 48 a or 48 b led out from the spiral part 42 toward the bottom face 28 of the core 10 , which lead part includes an end part 46 a or 46 b extending in parallel with the bottom face 28 and serves as an external terminal 49 a or 49 b ; and an insulated terminal 60 electrically insulated from the coil conductor 40 , which is provided on at least the bottom face 28 ; wherein the total base area of the bottom part 72 of the dummy terminal 60 , on the bottom face 28 , is greater than the total base area of the external terminals 49 a, 49 b.

First claim

I claim:

1. A coil component comprising:
a core formed by a metal magnetic material;
a coil conductor having:
a spiral part placed inside the core; and
lead parts, each of which is led out from the spiral part toward a principal outer surface constituting a bottom face of the core, and which includes an end part that extends in parallel with the bottom face of the core and serves as an external terminal; and

at least one insulated terminal electrically insulated from the coil conductor, wherein the at least one insulated terminal is formed by metal and installed on the core in a manner being provided on at least the bottom face of the core;
wherein a total base area of a bottom part of the at least one insulated terminal provided on the bottom face of the core, is greater than a total base area of the end parts of the external terminals.

2. The coil component according to claim 1 , wherein, of the lead parts of the coil conductor, a connection part that connects the spiral part with the end part is bonded to at least the core with an adhesive.

3. The coil component according to claim 1 , wherein the external terminal of the coil conductor is bonded to the bottom face of the core with an adhesive.

4. The coil component according to claim 1 , wherein:
the at least one insulated terminal is a plurality of insulated terminals electrically insulated from the coil conductor; and
the external terminals of the coil conductor are placed on a first side of the bottom face of the core, and the bottom parts of the plurality of the insulated terminals are placed on a second side and a third side, opposed to each other, of the bottom face of the core.

5. The coil component according to claim 1 , wherein the at least one insulated terminal is shaped to have: the bottom part positioned on the bottom face of the core; a top part positioned on a top face opposite the bottom face, of the core; and a side part coupling the bottom part and the top part.

6. The coil component according to claim 5 , wherein the at least one insulated terminal has an opening that extends from the top part to the side part, and an adhesive is filled in the opening.

7. The coil component according to claim 1 , wherein the at least one insulated terminal is shaped as a box that has: the bottom part positioned on the bottom face of the core; a top part positioned on a top face opposite the bottom face, of the core; three side parts coupling the bottom part and the top part; and an opening in which the core is stored.

8. The coil component according to claim 5 , wherein the at least one insulated terminal is shaped so that the top part is larger than the bottom part in area.

9. The coil component according to claim 8 , wherein the top part of the at least one insulated terminal covers all of the top face of the core.

10. The coil component according to claim 1 , wherein the at least one insulated terminal is shaped to have: the bottom part positioned on the bottom face of the core; and
a side part coupled to the bottom part and positioned on a side face that crosses with the bottom face, of the core.

11. The coil component according to claim 1 , wherein the core has a pillar part and a hollow space around the pillar part, and the spiral part is placed in the hollow space around the pillar part.

12. The coil component according to claim 1 , wherein the core is formed by an upper part and a lower part which are discrete parts and joined together.

13. An electronic device equipped with a coil component according to claim 1 , and a circuit board on which the coil component is mounted.

14. The electronic device according to claim 13 , wherein:
the lead parts of the coil conductor are constituted by two lead parts; and
of the two lead parts, one lead part is led out from the spiral part on a top face side of the core, and another lead part is led out from the spiral part on a bottom face side of the core,
wherein the circuit board has a first pad on the circuit board to which the external terminal of the one lead part is connected, and a second pad on the circuit board to which the external terminal of the other lead part is connected, wherein a higher voltage is applied to the first pad than to the second pad.

Assignees

• Taiyo Yuden Kk

Inventors

• Hayashi Chiharu

Classifications

• H01F27/263

  Fastening parts of the core together · CPC title

• H01F27/22

  Cooling by heat conduction through solid or powdered fillings · CPC title

• H05K1/0218

  by printed shielding conductors, ground planes or power plane (H05K1/0236 takes precedence) · CPC title

• H05K1/111

  Pads for surface mounting, e.g. lay-out · CPC title

• H01F2017/046

  helical coil made of flat wire, e.g. with smaller extension of wire cross section in the direction of the longitudinal axis · CPC title