Thin film type coil component

• US 10,643,785 B2
• Filed: 03/30/2017
• Issued: 05/05/2020
• Est. Priority Date: 08/23/2016
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Yang, Ju Hwan, Yoo, Young Seuck, Hong, Seok Il
• Primary Examiner(s): Enad, Elvin G
• Assistant Examiner(s): Hossain, Kazi S
• Application Number:
  US15/474,619
• Publication Number:
  US 20180061552A1
• Time in Patent Office: 1,132 Days
• Field of Search: 336200, 336232, 336 83
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 2017/048 with encapsulating core, e.g. made of resin and magnetic powder
• CPC Class Codes: H01F 27/292 Surface mounted devices

Abstract

A thin film type coil component that includes a body having a coil embedded therein and including a composite of magnetic powder particles and a polymer, and external electrodes disposed on at least portions of external surfaces of the body. The body includes an upper body portion disposed on an upper surface of the coil, a lower body portion disposed on a lower surface of the coil, and a central body portion disposed between the upper body portion and the lower body portion and including a central portion of the coil. The upper body portion and the lower body portion include a stacked structure of a plurality of magnetic sheets, each magnetic sheet including the composite of the magnetic powder particles and the polymer.

Claims

1. A thin film type coil component, comprising:

a body having a coil embedded therein and including a composite of magnetic powder particles and a polymer; and

external electrodes disposed on at least portions of external surfaces of the body,

wherein the body includes an upper body portion disposed on an upper surface of the coil, a lower body portion disposed on a lower surface of the coil, and a central body portion disposed between the upper body portion and the lower body portion and including a central portion of the coil,

the upper body portion and the lower body portion include a plurality of magnetic sheets, each magnetic sheet including the composite of the magnetic powder particles and the polymer, and

wherein at least one void is defined at an interface between adjacent magnetic sheets, the voids having a diameter of 1 μ

m or less.

2. The thin film type coil component of claim 1, wherein the magnetic powder particles are ferrite powder particles.

3. The thin film type coil component of claim 1, wherein the polymer is an epoxy resin.

4. The thin film type coil component of claim 1, wherein the central body portion includes an upper body extended portion of the upper body portion that extends toward the lower surface of the coil, and a lower body extended portion of the lower body portion that extends toward the upper surface of the coil.

5. The thin film type coil component of claim 1, wherein the upper body portion, the lower body portion, and the central body portion are integrated with one another and form an undivided integrated structure.

6. The thin film type coil component of claim 1, wherein the central body portion includes a coil outer portion, and

a through-hole is defined in the coil outer portion, the through-hole including magnetic powder particles and the polymer.

7. The thin film type coil component of claim 6, wherein an extension of the upper body portion and an extension of the lower body portion are disposed in the through-hole, and

the extension of the upper body portion and the extension of the lower body portion contact each other in the through-hole.

8. The thin film type coil component of claim 1, wherein the central body portion includes a coil outer portion, and

a first trench and a second trench are defined in the coil outer portion, the first and second trenches including magnetic powder particles and the polymer.

9. The thin film type coil component of claim 8, wherein an extension of the upper body portion is disposed in the first trench and an extension of the lower body portion is disposed in the second trench.

10. The thin film type coil component of claim 1, wherein the magnetic powder particles include spherical magnetic powder particles flake-shaped magnetic powder particles, ribbon-shaped magnetic powder particles, or combinations thereof.

11. The thin film type coil component of claim 1, wherein a content of the magnetic powder particles included in the magnetic sheet is about 70 wt% to about 99 wt% of the composite.

12. The thin film type coil component of claim 1, wherein a thickness of the upper body portion is about 60 μ

m to about 150 μ

m, and a thickness of the lower body portion is about 60 μ

m to about 150 μ

m.

13. The thin film type coil component of claim 1, wherein the magnetic sheet has magnetic permeability of about 1 to about 40.

14. The thin film type coil component of claim 1, wherein the external electrodes are disposed on a lower surface of the body.

15. The thin film type coil component of claim 1, wherein the external electrodes are disposed on side surfaces of the body and include band portions disposed on upper and lower surfaces of the body.

16. The thin film type coil component of claim 1, wherein the coil includes a stacked plurality of coil layers, and an insulating layer surrounding the stacked plurality of coil layers.

17. The thin film type coil component of claim 16, wherein the insulating layer includes polyimide, an epoxy resin, or benzocyclobutene (BCB).