Magnetic field shielding sheet and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2022368169-A1
Application number	US-202017620285-A
Country	US
Kind code	A1
Filing date	Jun 17, 2020
Priority date	Jun 18, 2019
Publication date	Nov 17, 2022
Grant date	—

Abstract

Provided is a magnetic field shielding sheet. A magnetic field shielding sheet according to an exemplary embodiment of the present invention is a magnetic field shielding sheet for an antenna, which includes a hollow portion having a predetermined area in a central portion thereof and a pattern portion configured to surround the hollow portion, includes a sheet body formed as a ribbon sheet including at least one selected from an amorphous alloy and a nanocrystalline alloy, a plurality of through-portions formed in a region of the sheet body corresponding to the pattern portion, and a plurality of cracks formed to extend from the through-portions.

First claim

1 . A magnetic field shielding sheet for an antenna that includes a hollow portion having a predetermined area in a central portion thereof and a pattern portion configured to surround the hollow portion, the magnetic field shielding sheet comprising:
a sheet body formed as a ribbon sheet including at least one selected from an amorphous alloy and a nanocrystalline alloy; a plurality of through-portions formed in a region of the sheet body corresponding to the pattern portion; and a plurality of cracks formed to extend from the through-portions.

2 . The magnetic field shielding sheet of claim 1 , wherein each of the plurality of through-portions has a length greater than a width.

3 . The magnetic field shielding sheet of claim 1 , wherein the plurality of through-portions are disposed to be spaced apart from each other at intervals.

4 . The magnetic field shielding sheet of claim 1 , wherein the through-portion includes:
a first portion formed in the region corresponding to the pattern portion; and a second portion extending from the first portion to a region corresponding to the hollow portion of the antenna.

5 . The magnetic field shielding sheet of claim 4 , wherein the plurality of through-portions are connected to each other through the second portion.

6 . The magnetic field shielding sheet of claim 4 , wherein the plurality of through-portions are formed such that the second portions thereof are connected to each other at a center point of the hollow portion of the antenna.

7 . The magnetic field shielding sheet of claim 1 , wherein:
the sheet body is a multi-layered sheet in which a plurality of ribbon sheets identical to the ribbon sheet are stacked in at least two layers; and the sheet body includes a protective film attached to at least one surface of an upper surface and a lower surface thereof through an adhesive layer.

8 . The magnetic field shielding sheet of claim 1 , wherein the magnetic field shielding sheet has a total thickness of 55 μm to 85 μm.

9 . The magnetic field shielding sheet of claim 1 , wherein the plurality of through-portions includes at least one type of a first through-portion formed in a direction perpendicular to a width direction or a length direction of the sheet body, a second through-portion formed in a direction parallel to the width direction or the length direction of the sheet body, a third through-portion formed to be inclined at a predetermined angle with respect to the width direction or the length direction of the sheet body, and a fourth through-portion formed in an arc shape having a predetermined curvature.

10 . A magnetic field shielding sheet for an antenna that includes a hollow portion having a predetermined area in a central portion thereof and a pattern portion configured to surround the hollow portion, the magnetic field shielding sheet comprising:
a sheet body formed as a multi-layered sheet in which a ribbon sheet including at least one selected from an amorphous alloy and a nanocrystalline alloy is stacked in two or three layers through an adhesive layer; a plurality of through-portions which are formed to pass through an arrangement region of the sheet body corresponding to the pattern portion and have a length greater than a width; and a plurality of cracks formed to extend from each of the plurality of through-portions, wherein: each of the plurality of through-portions is formed in a linear shape having a width of 0.1 mm to 0.4 mm; a the total number of the plurality of through-portions is 4 to 16; and the plurality of through-portions are formed to not be connected to each other.

11 . A wireless power receiving module comprising:
a wireless power reception antenna which includes a hollow portion having a predetermined area in a central portion thereof and a pattern portion configured to surround the hollow portion; and the magnetic field shielding sheet of claim 1 which is disposed on one surface of the wireless power reception antenna.

12 . A portable terminal device comprising the wireless power receiving module of claim 11 .

13 . A manufacturing method of a magnetic field shielding sheet for an antenna that includes a hollow portion having a predetermined area in a central portion thereof and a pattern portion configured to surround the hollow portion, the manufacturing method comprising:
providing a sheet body having a first area formed as a ribbon sheet including at least one selected from an amorphous alloy and a nanocrystalline alloy which are treated with heat; primarily punching the sheet body to form through-portions having a predetermined width and length in an inner region of the sheet body and form a plurality of cracks extending from the through-portions; and secondarily punching the sheet body to form a shielding sheet which includes the through-portions and has a second area that is relatively less than the first area.

14 . The manufacturing method of claim 13 , wherein the through-portions are formed to pass through a region of the sheet body corresponding to the pattern portion of the antenna.

15 . The manufacturing method of claim 13 , wherein the primary punching is performed using a mold which includes an edge blade having a rig shape configured to form an edge of the through-portion and a separation member formed in an inner region of the edge blade and configured to press a cut-out piece cut from the sheet body through the edge blade to separate the cut-out piece.

16 . The manufacturing method of claim 13 , wherein the secondary punching of the sheet body is forming an outer edge defining the second area in the sheet body such that the shielding sheet is separable from the sheet body.

17 . The manufacturing method of claim 16 , wherein:
the providing of the sheet body includes forming a multi-layered sheet in which a plurality of ribbon sheets identical to the ribbon sheet are stacked in a multi-layer through a first adhesive layer, and attaching a protective film to a lower surface of the multi-layered sheet through a second adhesive layer in which an adhesive is applied on both surfaces of a substrate; and the outer edge is formed to pass through the multi-layered sheet and the second adhesive layer.

Assignees

• Amosense Co Ltd

Inventors

• Jang Kil Jae

Classifications

• H05K9/0075

  Magnetic shielding materials · CPC title

• H01F27/36

  Electric or magnetic shields or screens (movable for varying inductance H01F21/10) · CPC title

• H02J50/70 Primary

  involving the reduction of electric, magnetic or electromagnetic leakage fields · CPC title

• H01Q1/526

  Electromagnetic shields · CPC title

• H02J50/20

  using microwaves or radio frequency waves · CPC title