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