Magnetic sheet, wireless charging sheet and method for manufacturing magnetic sheet

• US 9,793,741 B2
• Filed: 10/10/2014
• Issued: 10/17/2017
• Est. Priority Date: 10/14/2013
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Yeo, Jeong Gu, Choi, Kang Ryong, Choi, Dong Hyeok, An, Sung Yong, Jung, Chang Ryul, Ryu, Ji Man
• Primary Examiner(s): Hinson, Ronald
• Application Number:
  US14/512,032
• Publication Number:
  US 20150102892A1
• Time in Patent Office: 1,103 Days
• CPC Class Codes: H01F 1/14716 in the form of sheets
• CPC Class Codes: H01F 1/14791 Fe-Si-Al based alloys, e.g. Sendust
• CPC Class Codes: H01F 1/15391 Elongated structures, e.g. wires
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/361 made of combinations of electrically conductive material and ferromagnetic material
• 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: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

The present invention relates to a magnetic sheet, a wireless charging sheet, and a method for manufacturing a magnetic sheet. According to an embodiment of the present invention, a magnetic sheet used in a wireless charging sheet, which includes a metal sheet layer consisting of a plurality of divided segments; and an insulating material filled in a dividing space between the segments and forms a magnetic path of a magnetic field generated around a coil, is provided. Further, a wireless charging sheet and a method for manufacturing a magnetic sheet are provided.

Claims

1. A magnetic sheet, comprising:

a stacked structure formed by a plurality of alloy ribbon layers;

an adhesive layer interposed between the plurality of alloy ribbon layers; and

a protection layer disposed on at least one surface of the stacked structure and consisting of a plurality of divided segments,

wherein each alloy ribbon layer comprises;

a metal sheet layer consisting of a plurality of divided segments; and

an insulating material filled in a dividing space between the segments of the metal sheet layer.

2. The magnetic sheet according to claim 1, wherein a metal material included in the metal sheet layer is at least one of iron, nickel, aluminum, cobalt, and zinc, and

the insulating material comprises at least one of chlorinated polyethylene (CPE) resins, polypropylene (PP) resins, ethylene propylene rubber (EPR) resins, natural rubber (NR) resins, acrylonitrile-butadiene rubber (NBR) resins, and polyimide resins.

3. The magnetic sheet according to claim 1, wherein the segments of the metal sheet layer are uniformly divided in a lattice structure.

4. The magnetic sheet according to claim 1, wherein a width of the segments of the metal sheet layer is 0.5 to 12 mm, and a width of the insulating material is 10 μ

m to 3 mm.

5. The magnetic sheet according to claim 1, wherein the segments of the protection layer have a shape corresponding to that of the segments of the metal sheet layer.

6. The magnetic sheet according to claim 1, wherein the insulating layer is filled in a dividing space between the segments of the protection layer.

7. The magnetic sheet according to claim 1, wherein the alloy ribbon layers are formed of amorphous and nanocrystalline alloy ribbons.

8. The magnetic sheet according to claim 7, wherein the alloy ribbons are one of sendust, permalloy, Fe—

Si—

B, Fe—

Si—

B—

Cu—

Nb, Fe—

Zr—

B, and Co—

Fe—

Si—

B alloy ribbons.

9. A wireless charging sheet comprising:

a coil layer;

a metal body stacked on top or bottom of the coil layer; and

a magnetic sheet interposed between the coil layer and the metal body and comprising;

a stacked structure formed by a plurality of alloy ribbon layers, an adhesive layer interposed between the plurality of alloy ribbon layers, and a protection layer formed on at least one surface of the stacked structure and consisting of a plurality of divided segments, wherein each alloy ribbon layer comprises;

a metal sheet layer consisting of a plurality of divided segments, and

an insulating material filled in a dividing space between the segments of the metal sheet layer.

10. The wireless charging sheet according to claim 9, wherein a metal material included in the metal sheet layer is at least one of iron, nickel, aluminum, cobalt, and zinc, and

the insulating material comprises at least one of chlorinated polyethylene (CPE) resins, polypropylene (PP) resins, ethylene propylene rubber (EPR) resins, natural rubber (NR) resins, acrylonitrile-butadiene rubber (NBR) resins, and polyimide resins.

11. The wireless charging sheet according to claim 9, wherein the wireless charging sheet is formed in a wireless receiving-side charging module.

12. The wireless charging sheet according to claim 9, wherein the wireless charging sheet forms a charging module of a portable electronic terminal.

13. The wireless charging sheet according to claim 9, wherein a width of the segment is 0.5 to 12 mm, and a width of the insulating material is 10 μ

m to 3 mm.

14. The wireless charging sheet according to claim 9, wherein each segment of the metal sheet layer is formed by including one alloy ribbon layer, which has adhesive layers formed on top and bottom thereof, or laminating a plurality of alloy ribbon layers, which have the adhesive layers formed on top and bottom of a laminate and interposed therebetween, wherein the alloy ribbon layer is formed of amorphous and nanocrystalline alloy ribbons.

15. The wireless charging sheet according to claim 14, wherein the alloy ribbon is one of sendust, permalloy, Fe—

Si—

B, Fe—

Si—

B—

Cu—

Nb, Fe—

Zr—

B, and Co—

Fe—

Si—

B alloy ribbons.

16. The wireless charging sheet according to claim 14, wherein each segment of the metal sheet layer further comprises a protection layer in contact with the metal body.