Sheet for shielding against electromagnetic waves and wireless power charging device

• US 9,955,614 B2
• Filed: 03/04/2016
• Issued: 04/24/2018
• Est. Priority Date: 05/22/2015
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Park, Doo Ho, Cho, Jung Young, Chung, Jong Ho, Park, Sung Yeol, Cho, Sung Nam, Lee, Seung Min, Oh, Seung Hee
• Primary Examiner(s): Bernatz, Kevin M
• Application Number:
  US15/061,632
• Publication Number:
  US 20160345472A1
• Time in Patent Office: 781 Days
• Field of Search: None
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H05K 9/0075 Magnetic shielding materials

Abstract

A sheet for shielding against electromagnetic waves and a wireless power charging device are provided. The sheet for shielding against electromagnetic waves includes a plurality of magnetic layers and an adhesive layer interposed between the plurality of magnetic layers and forming chemical bonds with an adjacent magnetic layer.

Claims

1. A sheet for shielding against electromagnetic waves, the sheet comprising:

a plurality of magnetic layers including silicon (Si); and

an organosilane layer interposed between the plurality of magnetic layers, and directly bonded with two of the plurality of magnetic layers by silicon-oxygen bonds,

wherein the sheet has a thickness of 1 μ

m or less.

2. The sheet of claim 1, wherein the plurality of magnetic layers includes a metal ribbon.

3. The sheet of claim 1, wherein the plurality of magnetic layers includes an Fe—

Si—

B alloy.

4. The sheet of claim 3, wherein:

in the Fe—

Si—

B alloy,

a content of Fe is between 70 and 90 atomic %; and

a sum of the content of silicon (Si) and boron (B) is between 10 and 30 atomic %.

5. The sheet of claim 4, wherein in the Fe—

Si—

B alloy, a content of chromium (Cr) or cobalt (Co) is greater than 0 and less than or equal to 20 atomic %.

6. The sheet of claim 1, wherein silicon (Si) of the two of the plurality of magnetic layers and oxygen of the organosilane layer forms the silicon-oxygen bonds.

7. The sheet of claim 1, wherein a magnetic layer among the plurality of magnetic layers includes a plurality of fragments.

8. The sheet of claim 7, wherein the organosilane layer fills spaces between the plurality of fragments.

9. A wireless power charging device comprising:

a coil unit; and

an electromagnetic wave blocking sheet disposed between the coil unit and an external battery, and including;

a plurality of magnetic layers including silicon (Si); and

an organosilane layer interposed between the plurality of magnetic layers, and directly bonded with two of the plurality of magnetic layers by silicon-oxygen bonds,

wherein the sheet has a thickness of 1 μ

m or less.

10. The wireless power charging device of claim 9, wherein the plurality of magnetic layers includes a metal ribbon.

11. The wireless power charging device of claim 9, wherein the plurality of magnetic layers includes an Fe—

Si—

B alloy.

12. The wireless power charging device of claim 9, wherein silicon (Si) of the two of the plurality of magnetic layers include silicon (Si) and oxygen of the organosilane layer forms the silicon-oxygen bonds.

13. The wireless power charging device of claim 9, wherein a magnetic layer among the plurality of magnetic layers includes a plurality of fragments.

14. The wireless power charging device of claim 13, wherein the organosilane layer fills spaces between the plurality of fragments.