Electronic component and circuit board having the same mounted thereon

Patent metadata

Field	Value
Publication number	US-10062493-B2
Application number	US-201414552867-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Nov 26, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

An electronic component and a circuit board having the same mounted thereon. The electronic component includes: a base part; a coil part provided on the base part and including a coil formed by disposing conductive patterns in a spiral shape and an external terminal connected to an end portion of the coil; and a cover part including an external electrode having a first surface contacting an upper surface of the external terminal and a second surface opposing the first surface and a magnetic material part provided on the coil part, made of a magnetic material, and exposing the second surface, wherein a surface area of the first surface is larger than a surface area of the second surface.

First claim

What is claimed is:

1. An electronic component comprising:
a base part made of a magnetic material;
a coil part provided on the base part and including a coil formed by disposing conductive patterns in a spiral shape and an external terminal connected to an end portion of the coil; and
a cover part including an external electrode and a magnetic material part,
wherein the external electrode has a first surface contacting an upper surface of the external terminal, a second surface opposing the first surface and side surfaces connecting edges of the first surface to edges of the second surface,
the magnetic material part is disposed on the coil part such that all of the side surfaces of the external electrode contact the magnetic material part and the second surface of the external electrode is exposed,
a surface area of the first surface of the external electrode is larger than a surface area of the second surface of the external electrode,
the external electrode includes first and second external electrodes,
in a cross-section taken in a width-thickness direction, a width of an upper surface of the magnetic material part disposed between the first and second external electrodes is greater than a width of a lower surface of the magnetic material part disposed between the first and second external electrodes, and
a portion of the external terminal facing the coil is concavely depressed so as to correspond to a shape of the coil.

2. The electronic component according to claim 1 , wherein a maximum value of a width of the first surface of the external electrode in a long side direction is larger than a maximum value of a width of the second surface of the external electrode in the long side direction.

3. The electronic component according to claim 2 , wherein the maximum value of the width of the second surface of the external electrode in the long side direction is 0.4 to 0.9 times the maximum value of the width of the first surface of the external electrode in the long side direction.

4. The electronic component according to claim 3 , wherein a maximum value of a width of the first surface of the external electrode in a short side direction is larger than a maximum value of a width of the second surface of the external electrode in the short side direction.

5. The electronic component according to claim 3 , wherein a maximum value of a width of the second surface of the external electrode in a short side direction is 0.5 to 0.9 times a maximum value of a width of the first surface of the external electrode in the short side direction.

6. The electronic component according to claim 2 , wherein a maximum value of a width of the first surface of the external electrode in a short side direction is larger than a maximum value of a width of the second surface of the external electrode in the short side direction.

7. The electronic component according to claim 6 , wherein the maximum value of the width of the second surface of the external electrode in the short side direction is 0.5 to 0.9 times the maximum value of the width of the first surface of the external electrode in the short side direction.

8. The electronic component according to claim 6 , wherein at least one of a condition in which an angle between a surface including a long side of the first surface of the external electrode and a long side of the second surface of the external electrode and the short side of the first surface of the external electrode is 80 to 86 degrees and a condition in which an angle between a surface including a short side of the first surface of the external electrode and a short side of the second surface of the external electrode and the long side of the first surface of the external electrode is 70 to 86 degrees is satisfied.

9. The electronic component according to claim 2 , wherein at least one of a condition in which an angle between a surface including a long side of the first surface of the external electrode and a long side of the second surface of the external electrode and the short side of the first surface of the external electrode is 80 to 86 degrees and a condition in which an angle between a surface including a short side of the first surface of the external electrode and a short side of the second surface of the external electrode and the long side of the first surface of the external electrode is 70 to 86 degrees is satisfied.

10. The electronic component according to claim 1 , wherein the surface area of the second surface of the external electrode is 0.2 to 0.8 times the surface area of the first surface of the external electrode.

11. The electronic component according to claim 1 , wherein a maximum value of a width of the first surface of the external electrode in a short side direction is larger than a maximum value of a width of the second surface of the external electrode in the short side direction.

12. The electronic component according to claim 11 , wherein the maximum value of the width of the second surface of the external electrode in the short side direction is 0.5 to 0.9 times the maximum value of the width of the first surface of the external electrode in the short side direction.

13. The electronic component according to claim 1 , wherein at least one of a condition in which an angle between a surface including a long side of the first surface of the external electrode and a long side of the second surface of the external electrode and the short side of the first surface of the external electrode is 80 to 86 degrees and a condition in which an angle between a surface including a short side of the first surface of the external electrode and a short side of the second surface of the external electrode and the long side of the first surface of the external electrode is 70 to 86 degrees is satisfied.

14. A circuit board having the electronic component according to the claim 1 mounted thereon, comprising:
a board; and
a circuit pattern formed on the board and having the second surface of the external electrode electrically connected thereto.

15. The circuit board according to claim 14 , further comprising a conductive solder paste provided between the second surface of the external electrode and the circuit pattern.

16. An electronic component comprising:
a base part made of a magnetic material;
a coil part provided on the base part and including a coil formed by disposing conductive patterns in a spiral shape and an external terminal connected to an end portion of the coil;
an external electrode having a first surface contacting the external terminal, a second surface opposing the first surface, and side surfaces connecting between the first surface and the second surface; and
a magnetic material part covering a surface of the coil part and contacting all of the side surfaces of the external electrode such that the second surface of the external electrode is exposed,
wherein a vertical cross section of the external electrode cut in a direction perpendicular to at least one of the first surface of the external electrode and the second surface of the external electrode has a trapezoidal shape,
the external electrode includes first and second external electrodes,
in a cross-section taken in a width-thickness direction, a width of an upper surface of the magnetic material part disposed between the first and second external electrodes is greater than a width of a lower surface of the magnetic material part disposed between the first and second external electrodes, and
an upper surface of the external terminal is disposed to be higher than that of the coil.

17. Th

Assignees

• Samsung Electro Mech

Inventors

• Chang Geon Se
• Kweon Young Do
• Yang Jin Hyuck

Classifications

• H01F17/0006

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• H01F27/2804 Primary

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• H01F27/292

  Surface mounted devices · CPC title

• H01F2027/2809

  on stacked layers · CPC title