Coil component and board having the same

• US 9,942,987 B2
• Filed: 08/05/2016
• Issued: 04/10/2018
• Est. Priority Date: 11/19/2015
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Yoon, Chan, Lee, Dong Hwan, Ahn, Young Ghyu
• Primary Examiner(s): Chan, Tsz
• Application Number:
  US15/229,354
• Publication Number:
  US 20170150606A1
• Time in Patent Office: 613 Days
• Field of Search: 336 83, 336200, 336232
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 17/0033 with the coil helically wound around a magnetic core
• CPC Class Codes: H01F 27/085 Cooling by ambient air
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: H05K 2201/1003 Non-printed inductor
• CPC Class Codes: H05K 2201/10636 Leadless chip, e.g. chip capacitor or resistor
• CPC Class Codes: H05K 3/3442 having edge contacts, e.g. leadless chip capacitors, chip carriers
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A coil component includes: an internal coil; a magnetic body having the internal coil embedded therein, and having first and second surfaces opposing each other in a first direction, third and fourth surfaces opposing each other in a second direction, and fifth and sixth surfaces opposing each other in a third direction; and external electrodes connected to the internal coil and disposed on outer surfaces of the magnetic body. 0<T1/T2<1, where T1 is a thickness of the magnetic body at a central axis of the internal coil, and T2 is a thickness of the magnetic body at a point B positioned to be spaced apart from the central axis of the internal coil by a predetermined distance.

Claims

1. A coil component comprising:

an internal coil;

a magnetic body having the internal coil embedded therein, and having first and second surfaces opposing each other in a first direction, third and fourth surfaces opposing each other in a second direction, and fifth and sixth surfaces opposing each other in a third direction; and

external electrodes connected to the internal coil and disposed on outer surfaces of the magnetic body,

wherein 0<

T1/T2<

1, where T1 is a thickness of the magnetic body at a central axis of the internal coil, and T2 is a thickness of the magnetic body at a point B positioned to be spaced apart from the central axis of the internal coil by a predetermined distance,

wherein the external electrodes are not disposed on any portion of the magnetic body where the thickness of the magnetic body is less than or equal to T1.

2. The coil component of claim 1, wherein T2 has a maximum value when the point B is positioned in a region in which the external electrode and the magnetic body overlap each other.

3. The coil component of claim 1, wherein T2 has a maximum value when the point B is positioned in a position most distant from the central axis of the internal coil.

4. The coil component of claim 1, wherein T1/T2<

0.96.

5. The coil component of claim 1, wherein 0.90<

T1/T2<

0.96.

6. The coil component of claim 1, wherein T2 is within the range of 0.5 mm to 0.65 mm.

7. The coil component of claim 1, wherein T1 is larger than a length of the internal coil in the first direction.

8. The coil component of claim 1, wherein the first surface includes a concave region based on the central axis of the internal coil.

9. The coil component of claim 1, wherein the first surface has a concave form based on the central axis of the internal coil.

10. The coil component of claim 1, wherein the second surface includes a concave region based on the central axis of the internal coil.

11. The coil component of claim 1, wherein the second surface has a concave form based on the central axis of the internal coil.

12. The coil component of claim 1, wherein the external electrodes include first and second external electrodes disposed to face each other in the second direction.

13. The coil component of claim 1, wherein the first surface includes a concave region based on the central axis of the internal coil and the second surface has a flat shape.

14. The coil component of claim 1, wherein the first and second surfaces each include a concave region based on the central axis of the internal coil.

15. The coil component of claim 1, wherein the first and second surfaces each include a concave region based on the central axis of the internal coil, and the third and fourth surfaces have a length shorter than T2.

16. A board having a coil component, comprising:

a printed circuit board having a plurality of electrode pads disposed thereon; and

the coil component installed on the printed circuit board,

wherein the coil component includes;

an internal coil;

a magnetic body having the internal coil embedded therein, and having first and second surfaces opposing each other in a first direction, third and fourth surfaces opposing each other in a second direction, and fifth and sixth surfaces opposing each other in a third direction; and

external electrodes connected to the internal coil and disposed on outer surfaces of the magnetic body,

wherein 0<

T1/T2<

1, where T1 is a thickness of the magnetic body at a central axis of the internal coil, and T2 is a thickness of the magnetic body at a point B positioned to be spaced apart from the central axis of the internal coil by a predetermined distance,

wherein the external electrodes are not disposed on any portion of the magnetic body where the thickness of the magnetic body is less than or equal to T1.

17. The board having a coil component of claim 16, wherein the first surface includes a concave region toward the second surface based on the central axis of the internal coil.

18. The board having a coil component of claim 16, wherein the second surface includes a concave region toward the first surface based on the central axis of the internal coil.