Composite Magnetic Sheet and Wireless Charging Module Comprising Same

Patent metadata

Field	Value
Publication number	US-2017244271-A1
Application number	US-201515515468-A
Country	US
Kind code	A1
Filing date	Sep 25, 2015
Priority date	Sep 29, 2014
Publication date	Aug 24, 2017
Grant date	—

Abstract

The present invention relates to an electromagnetic shielding sheet capable of improving reliability. Particularly, the present invention provides a composite magnetic sheet for electromagnetic shielding structured such that an independent soft magnetic sheet, which has a low surface roughness, is laminated on the outermost surface of a soft magnetic sheet having a lamination structure, thereby implementing laminated composite sheets having different surface roughness or porosity characteristics; as a result, the reliability in an external hazardous environment, such as saline water, can be substantially enhanced while maintaining the efficiency of electromagnetic shielding.

First claim

1 . A composite magnetic sheet comprising:
a first magnetic sheet part having a stacked structure of two or more unit magnetic sheets; and a second magnetic sheet part including a second magnetic sheet stacked on an outermost surface of the first magnetic sheet part, wherein a surface roughness of each of the two or more unit magnetic sheets is different from that of the second magnetic sheet.

2 . The composite magnetic sheet claim 1 , wherein the surface roughness of each of the two or more unit magnetic sheets is greater than that of the second magnetic sheet.

3 . The composite magnetic sheet claim 2 , wherein permeability of each of the two or more unit magnetic sheets is different from that of the second magnetic sheet.

4 . The composite magnetic sheet claim 3 , wherein the permeability of each of the two or more unit magnetic sheets is lower than that of the second magnetic sheet.

5 . The composite magnetic sheet claim 4 , wherein a volume of the first magnetic sheet part is in a range of 70% to 80% of an entire volume of the composite magnetic sheet on the basis of the entire volume.

6 . The composite magnetic sheet claim 4 , wherein the first magnetic sheet part includes one or more unit magnetic sheets having different porosity on the basis of the same volume.

7 . The composite magnetic sheet claim 6 , wherein the porosity of each of the one or more unit magnetic sheets is higher than that of the first magnetic sheet.

8 . The composite magnetic sheet claim 4 , wherein the first magnetic sheet part includes two or more unit magnetic sheets which are made of different materials and stacked.

9 . The composite magnetic sheet claim 8 , wherein at least one of the two or more unit magnetic sheets and the second magnetic sheet are formed of the same material.

10 . The composite magnetic sheet claim 4 , wherein each of the two or more unit magnetic sheets or the second magnetic sheet includes a metallic-alloy based magnetic powder consisting of one element or a combination of two or more elements selected from Fe, Ni, Co, Mo, Si, Al, and B, and a polymer composite material.

11 . The composite magnetic sheet claim 4 , wherein each of the two or more unit magnetic sheets or the second magnetic sheet includes a ferrite powder consisting of a combination of two or more elements selected from Fe, Ni, Mn, Zn, Co, Cu, and Ca, and a polymer composite material.

12 . The composite magnetic sheet claim 4 , wherein each of the two or more unit magnetic sheets or the second magnetic sheet includes a ferrite-based sintered material consisting of a combination of two or more elements selected from Fe, Ni, Mn, Zn, Co, Cu, and Ca.

13 . A wireless charging module comprising:
a first magnetic sheet part having a stacked structure of two or more unit magnetic sheets; and a second magnetic sheet stacked on an outermost surface of the first magnetic sheet part, wherein the wireless charging module further includes: a composite magnetic sheet provided with a second magnetic sheet part in which a surface roughness of each of the two or more unit magnetic sheets is different from that of the second magnetic sheet; and a coil part disposed on the composite magnetic sheet.

14 . The composite magnetic sheet claim 13 , wherein the coil part is disposed on a surface opposite a surface on which the second magnetic sheet is disposed among outermost surfaces of the composite magnetic sheet.

15 . The composite magnetic sheet claim 12 , wherein an insulating layer is further included between the composite magnetic sheet and the coil part.

Assignees

• Lg Innotek Co Ltd

Inventors

• Kim So Yeon
• Lee Sang Won
• Lee Jong Hyuk
• Bae Seok

Classifications

• H01F1/26

  by macromolecular organic substances · CPC title

• H01F27/245

  made from sheets, e.g. grain-oriented (H01F27/26 takes precedence) · CPC title

• H01F2027/2809

  on stacked layers · CPC title

• H02J50/10

  using inductive coupling · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title