CN112103641B - Magnetic field shielding sheet, method for manufacturing same, wireless power receiving module, and terminal device - Google Patents
Magnetic field shielding sheet, method for manufacturing same, wireless power receiving module, and terminal device Download PDFInfo
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- CN112103641B CN112103641B CN202010220009.9A CN202010220009A CN112103641B CN 112103641 B CN112103641 B CN 112103641B CN 202010220009 A CN202010220009 A CN 202010220009A CN 112103641 B CN112103641 B CN 112103641B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/526—Electromagnetic shields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
- H02J50/27—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of receiving antennas, e.g. rectennas
Abstract
A magnetic field shield sheet according to an embodiment of the present invention is a magnetic field shield sheet disposed on a surface of an antenna having a hollow portion with a predetermined area formed in a central portion thereof, the magnetic field shield sheet including: a sheet body formed of a multilayer sheet in which a plurality of tape sheets including at least one of a heat-treated amorphous alloy and a nanocrystalline alloy are stacked in layers with a first adhesive layer as a medium; a plurality of through parts formed to penetrate through corresponding regions corresponding to the hollow parts of the antenna, and formed in a line shape having a predetermined width and length; and a plurality of slits formed in the corresponding region so as to extend from an edge of the through-hole toward the sheet body.
Description
Technical Field
The invention relates to a magnetic field shielding sheet and a manufacturing method thereof, a wireless power receiving module and a portable terminal device thereof.
Background
Near Field Communication (NFC) and wireless charging are essentially contactless transmission methods. Such a contactless transmission system is embodied by an antenna that transmits or receives a magnetic field and a magnetic field shield sheet that is disposed on one surface of the antenna and can smoothly transmit or receive the magnetic field.
In general, as the magnetic field shielding sheet, a sheet composed of a magnetic material such as an amorphous ribbon sheet, a ferrite material, or a polymer sheet is used.
On the other hand, the magnetic shielding sheet uses a sheet in a form separated by a plurality of pieces, so that it is possible to greatly reduce loss due to Eddy Current (Eddy Current) or to improve flexibility of the sheet itself.
As one example, the magnetic field shielding sheet may be separated into a plurality of pieces through a sheet making process. That is, in the sheet-making step, the magnetic shielding sheet is passed through a space between a metal roller having a plurality of convex-concave or circular balls on the outer surface and a rubber roller disposed to face the metal roller a plurality of times, and the magnetic shielding sheet can be separated into a plurality of pieces.
Therefore, in order to manufacture the magnetic field shielding sheet formed by separating a plurality of pieces, an additional sheet making process for separating the shielding sheet itself into a plurality of pieces is added, and thus there is a problem that the production unit price is increased.
On the other hand, in the sheet making process performed by a pair of rollers, since the entire area of the sheet is pressed while the magnetic-field-shielding sheet passes between the pair of rollers, all the sheets of the magnetic-field-shielding sheet produced by the sheet making process are necessarily separated by a plurality of pieces.
In addition, the magnetic shield sheet formed by separating a plurality of chips in the conventional sheet-making process can be embodied as a shield sheet exhibiting uniform characteristics only when the sheet-making process is performed a plurality of times.
However, since the size of the separated pieces is smaller as the sheet-making process is repeated, and the total number of the separated pieces is increased, the influence of the eddy current can be reduced as the impedance of the shield sheet is increased as the sheet-making process is repeated, but the permeability of the shield sheet is lowered to 1500 or less.
Therefore, in order to embody a magnetic field shielding sheet having a high magnetic permeability of 2000 or more while increasing the impedance of the shielding sheet itself, there is a problem that the entire thickness of the magnetic field shielding sheet needs to be increased.
Disclosure of Invention
Solves the technical problem
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a magnetic field shielding sheet which can form a slit only in a partial region where magnetic flux is concentrated over the entire area, has a small thickness, and exhibits a high magnetic permeability of 2000 or more, and a method for manufacturing the same.
Another object of the present invention is to provide a method for manufacturing a magnetic shield sheet, which can selectively form slits only in a partial region where magnetic flux is concentrated over the entire area, without performing a separate sheet-making process.
Technical scheme
In order to achieve the above object, the present invention provides a magnetic field shielding sheet disposed on one surface of an antenna having a hollow portion with a predetermined area formed in a central portion thereof, the magnetic field shielding sheet including: a sheet body formed of a multilayer sheet in which a plurality of tape sheets including at least one of a heat-treated amorphous alloy and a nanocrystalline alloy are stacked in layers with a first adhesive layer as a medium; a plurality of through parts formed to penetrate through corresponding regions corresponding to the hollow parts of the antenna, and formed in a line shape having a predetermined width and length; and a plurality of slits formed in the corresponding region so as to extend from an edge of the through-hole toward the sheet body.
The through-hole may be formed such that the width thereof is 3 times or more the length thereof.
As one example, the plurality of through portions may be arranged at intervals from each other. In this case, the plurality of through parts may be arranged in such a manner as to surround a center point of the corresponding region, and a portion of the corresponding region including the center point is separated into a plurality of pieces by a plurality of slits extending from the plurality of through parts.
As another example, the plurality of through parts may be formed such that at least a portion thereof is connected to each other. In this case, the plurality of through parts may be formed such that one end parts are connected to each other at the center point of the corresponding region.
As yet another example, the plurality of through portions may include at least one or more of the following through portions: a first through-hole formed in a direction perpendicular to a width direction or a length direction of the sheet main body; a second through-hole formed in a direction parallel to the width direction or the length direction of the sheet main body; and a third through hole formed at a predetermined angle with respect to the width direction or the length direction of the sheet main body.
The sheet body may include a protective film attached to at least one of the upper surface and the lower surface via the second adhesive layer.
In addition, the overall thickness of the magnetic field shielding sheet may be 55 to 85 μm.
In another aspect, the present invention provides a wireless power receiving module, including: a wireless power receiving antenna having a hollow portion formed in a central portion thereof and having a predetermined area; and the magnetic field shielding sheet is disposed on one surface of the wireless power receiving antenna.
In addition, the wireless power receiving module may be included in a portable terminal device.
In another aspect of the present invention, a method of manufacturing a magnetic shield sheet disposed on one surface of an antenna having a hollow portion with a predetermined area formed in a central portion thereof, includes: preparing a multilayer sheet having a first area in which a plurality of layers are stacked with a first adhesive layer as a medium, the multilayer sheet including a plurality of tape pieces including at least one of a heat-treated amorphous alloy and a nanocrystalline alloy; and a step of punching the shield plate with a die so that a plurality of linear through portions having a predetermined width and length can be formed through an inner region of the shield plate while the shield plate having a second area relatively narrower than the first area is separated from the multilayer sheet; the step of punching out the multilayer sheet forms a plurality of slits extending from edges of the through portion in the shield piece at the same time as the through portion is formed.
The linear through-hole may be formed to penetrate through a corresponding region corresponding to the hollow portion of the antenna.
In addition, the mold may include a ring-shaped first edge blade for processing an edge of the shield plate, a ring-shaped second edge blade disposed inside the first edge blade for forming an edge of the penetration portion, and a separating member formed inside the second edge blade and pressing the cut piece cut from the shield plate by the second edge blade.
In addition, the cut-off piece may be separated from the shielding sheet by the separation member.
The multilayer sheet may include a protective film attached to at least one of the upper surface and the lower surface of the multilayer sheet by using a second adhesive layer having an adhesive applied to both surfaces of the base material as a medium, and the through-hole may be formed so as to penetrate the multilayer sheet and the protective film.
Effects of the invention
According to the present invention, a high permeability of 2000 or more can be achieved while having a very thin thickness.
In addition, the present invention can selectively form the slit only in a partial region where the magnetic flux is concentrated in the entire area, without performing a separate tableting process. Therefore, the invention can simplify the manufacturing process and reduce the production unit price.
Drawings
Figure 1 is a diagram showing a magnetic field shield according to one embodiment of the present invention,
figure 2 is a cross-sectional view of the magnetic field shield shown in figure 1,
fig. 3 is an enlarged view of a corresponding region corresponding to the hollow portion of the antenna in fig. 1, conceptually showing the through portion and the slit induced from the through portion,
FIG. 4 is a view conceptually showing another form of through portion which can be formed in a corresponding region corresponding to the hollow portion of the antenna in FIG. 1 and a slit induced from the through portion,
fig. 5 is a view conceptually showing various forms of through portions and cracks induced thereby that can be formed in corresponding regions corresponding to the hollow portions of the antenna in fig. 1,
figure 6 is a diagram showing a wireless power receiving module according to one embodiment of the present invention,
FIG. 7 is a sequence diagram showing a method of manufacturing a magnetic field-shielding sheet according to an embodiment of the present invention,
fig. 8 is a view conceptually showing a step of punching in the manufacturing method of the magnetic-field-shielding sheet of one embodiment of the present invention,
fig. 9a and 9b are views showing one form of a mold which can be used in the method for manufacturing a magnetic shielding sheet according to the embodiment of the present invention, and,
fig. 10 is a view showing various forms of the second edge blade in the mold that can be used in the method for manufacturing a magnetic field shielding sheet according to the embodiment of the present invention.
Description of reference numerals
100: magnetic field shield sheet 110: sheet body
111 a: tape piece 111 b: first adhesive layer
112: second adhesive layer 113: protective film
120. 120a, 120b, 120 c: through portion 130: crack(s)
200: the wireless power receiving module 210: circuit board
211: antenna, antenna for wireless power reception 212: MST antenna
213: the NFC antenna 10: die set
12: first edge blade 14: second edge blade
16: separating member
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, portions that are not related to the description are omitted, and the same reference numerals are given to the same or similar constituent elements throughout the specification.
As shown in fig. 1 and 3, a magnetic field shielding sheet 100 according to an embodiment of the present invention includes a sheet body 110, a through portion 120, and a slit 130.
The sheet body 110 may be formed of a material having magnetism so as to shield magnetic fields generated from the antennas 211, 212, 213.
The antennas 211, 212, and 213 may be formed by patterning at least one surface of the circuit board 210 so that a hollow E having a predetermined area is formed in the center portion, or may be formed by winding a conductive member having a predetermined wire diameter so that a hollow E having a predetermined area is formed in the center portion, for example, in a multi-turn plate-type coil.
The antennas 211, 212, and 213 may be antennas for wireless power transmission that transmit or receive wireless power, MST antennas for magnetic settlement, or NFC antennas for near field communication.
The antennas 211, 212, and 213 may be combined antennas including two or more of the above-described wireless power transmission antenna, MST antenna, and NFC antenna.
In this case, the sheet main body 110 may be formed of a material containing a metal component so that the slit 130 can be formed from the through portion 120.
As an example, the sheet body 110 may be a band sheet 111a including at least one of an amorphous alloy and a nanocrystalline alloy, as shown in fig. 2, and the plurality of band sheets 111a may be a multilayer sheet in which a plurality of layers are stacked with the first adhesive layer 111b as a medium.
The sheet main body 110 may include a protective film 113 attached to at least one of the upper and lower surfaces through the second adhesive layer 112.
Therefore, even if the slit 130 extending from the through portion 120 is formed, the sheet main body 110 can maintain a plate-like shape by the protective film 113.
In this case, as shown in fig. 3 and 4, the magnetic field shielding sheet 100 according to an embodiment of the present invention may include a through portion 120 formed inside the sheet body 110 and a plurality of slits 130 formed to extend from the through portion 120.
As an example, the through portion 120 may be formed to penetrate the sheet body 110, and the plurality of slits 130 may be formed to extend from an edge of the through portion 120 to an inner side of the sheet body 110. In addition, the plurality of slits 130 formed from the edge of the through part 120 may or may not be connected to each other, or some of the plurality of slits 130 may be connected to each other and the rest may not be connected to each other.
When the protective film 113 is attached to at least one surface of the sheet main body 110, the through portion 120 may be formed to penetrate the sheet main body 110 and the protective film 113. In addition, the plurality of slits 130 may be induced from the edges of the through part 120 by an external force applied to the sheet body 110 during the process of forming the through part 120 by the sheet body 110.
Accordingly, the magnetic field shielding sheet 100 according to an embodiment of the present invention may increase the overall impedance by the through portion 120 and the plurality of slits 130 formed in the sheet body 110, so that the influence caused by the eddy current may be reduced.
The through-holes 120 may be formed in a linear shape having a predetermined width and length, and may be formed in an appropriate number of one or more. The through-hole 120 may be formed such that the width thereof is 3 times or more the length thereof. The total number of the plurality of slits 130 may be relatively larger than the total number of the through portions 120.
In this case, in the magnetic field shielding sheet 100 according to an embodiment of the present invention, the through portion 120 and the plurality of slits 130 may be partially formed only in a part of the entire area of the sheet main body 110.
As an example, the through portion 120 and the plurality of slits 130 may be formed only in a partial region where the magnetic flux is concentrated in the entire area of the sheet body 110.
Accordingly, the magnetic field shielding sheet 100 according to the embodiment of the present invention is configured such that the through-hole 120 and the plurality of slits 130 are partially formed only in a partial region where magnetic flux is concentrated, and the overall impedance of the sheet itself is increased, so that the sheet can have a high magnetic permeability of 2000 or more even in a thin thickness while minimizing the influence of eddy current.
As an example, the magnetic-field-shielding sheet 100 according to an embodiment of the present invention may have a high magnetic permeability of 2000 or more even at a very thin thickness of 55 μm to 85 μm as a whole.
Therefore, the magnetic field shielding sheet 100 according to an embodiment of the present invention can be made thin and increase the inductance of the antennas 211, 212, and 213.
Specifically, as shown in fig. 1 and 6, when the antennas 211, 212, and 213 are disposed on one surface of the magnetic field shielding sheet 100 according to one embodiment of the present invention, the through-portion 120 and the plurality of slits 130 extending from the through-portion 120 may be formed only in the corresponding region S corresponding to the hollow portion E of the antennas 211, 212, and 213 in the entire area of the sheet body 110.
As an example, as shown in fig. 3 and 4, a plurality of through portions 120 may be formed in the corresponding region S, a plurality of through portions 120 formed in the corresponding region S may be disposed at intervals, and the plurality of slits 130 may be formed to extend from each of the plurality of through portions 120.
In this case, as shown in fig. 3, the plurality of through portions 120 may be radially formed with reference to a center point of the corresponding region S. At this time, a partial region S' including a center point of the corresponding region in the entire area of the corresponding region S may be separated into a plurality of pieces by the slits 130 respectively extended from the plurality of through parts 120.
As shown in fig. 4, the plurality of through holes 120 may be formed radially with respect to a center point of the corresponding region S, and at least a portion of the plurality of through holes 120 may be connected to each other. At this time, the plurality of through parts 120 may be formed such that one ends are connected to each other at the center point of the corresponding area S. Thus, the plurality of through portions 120 may be connected to each other to form one through portion. Wherein a portion of the corresponding region S' including the center point of the plurality of through parts 120 connected to each other in the entire area of the corresponding region S may be separated into a plurality of fragments by slits 130 respectively extended from the plurality of through parts 120 connected to each other at one end.
Accordingly, a partial area including the center point in the entire area of the corresponding region S is separated into a plurality of pieces by the plurality of slits 130 extending from the plurality of through-holes 120, and thus, the corresponding region S can be formed in a similar manner to a sheet separated and formed in a conventional sheet forming process.
However, the magnetic field shielding sheet 100 according to an embodiment of the present invention is not limited to the arrangement of the through portions 120, and the through portions 120 may be formed in various ways as long as they are formed in the corresponding regions S.
That is, the plurality of through-holes 120 may be formed by at least one of the first through-hole 120a, the second through-hole 120b, and the third through-hole 120c, and the plurality of through-holes 120 may be variously formed in the corresponding region S as shown in fig. 5 (a) to (f).
The first through hole 120a may be a linear through hole formed in a direction perpendicular to the width direction or the length direction of the sheet main body 110, and the second through hole 120b may be a linear through hole formed in a direction parallel to the width direction or the length direction of the sheet main body 110. The third through hole 120c may be a linear through hole formed at a predetermined angle with respect to the width direction or the length direction of the sheet main body 110.
The magnetic field shielding sheet 100 according to one embodiment of the present invention described above may be embodied in a wireless power receiving module 200 for wireless power transmission.
That is, as shown in fig. 6, the wireless power receiving module 200 may include a wireless power receiving antenna 211 for wireless power reception, and a magnetic field shielding sheet 100, wherein the magnetic field shielding sheet 100 is disposed on one surface of the wireless power receiving antenna 211, and shields a magnetic field and focuses the magnetic field in a desired direction.
The wireless power receiving antenna 211 may be an antenna pattern formed by patterning at least one surface of the circuit board 210 so that a hollow portion E having a predetermined area is formed in the central portion, or may be a flat-type coil formed by winding a conductive member having a predetermined wire diameter in a plurality of turns so that a hollow portion having a predetermined area is formed in the central portion.
In addition, the magnetic field shielding sheet 100 constituting the wireless power receiving module 200 may be the magnetic field shielding sheet 100 described above.
In the wireless power receiving module 200, the antenna may be constituted by only the wireless power receiving antenna 211, but may include various antennas that perform different functions from each other.
As an example, the wireless power receiving module 200 may further include at least one of an MST antenna for magnetic settlement and an NFC antenna for near field communication, in addition to the wireless power receiving antenna 211. At this time, the wireless power receiving antenna 211 may have a relatively smaller size than other antennas, and the corresponding region S may be a region corresponding to the hollow E of the wireless power receiving antenna 211.
Also, the wireless power receiving module 200 may be applied to portable terminal devices such as a cellular phone, a tablet computer, and the like.
On the other hand, the above-described magnetic field shielding sheet 100 may be produced by the following manufacturing method.
That is, as shown in fig. 7, the method for manufacturing a magnetic field shielding sheet according to an embodiment of the present invention may include: a step S1 of preparing a multilayer sheet a having a first area; and a step S2 of punching the second-area shield sheet 300 from the multilayer sheet a.
The step S1 of preparing the multilayer sheet a may be a previous step of cutting the sheet into a predetermined size according to the place of use and the purpose of use to produce a magnetic field shielding sheet to be a final product.
The shielding sheet 300 may be the magnetic field shielding sheet 100.
The multilayer sheet a may be a plate-like sheet having a first surface, and may be made of a material having magnetic properties.
In this case, the multi-layer sheet a may be formed of a material containing a metal component, or may be a heat-treated sheet, so that the crack 130 may be induced from the through portion 120 formed in the shield sheet 300 by an external force in the process of punching the shield sheet 300 having the second area.
As an example, as shown in fig. 8, the multilayer sheet a may be a sheet in which a plurality of tape pieces 111a including at least one of an amorphous alloy and a nanocrystalline alloy are stacked in layers with the first adhesive layer 111b as a medium, and each tape piece 111a may be a heat-treated tape piece.
The respective tape pieces 111a constituting the multilayer sheet a may be heat-treated tape pieces, and the multilayer sheet a may be in a state in which the protective film 113 is attached to at least one of the upper surface and the lower surface via the second adhesive layer 112.
That is, in the step S1 of preparing the multilayer sheet, the plurality of tape pieces 111a may be laminated with the first adhesive layer 111b as a medium to form a multilayer tape piece, and then the protective film 113 may be attached to at least one of the upper surface and the lower surface of the multilayer tape piece with the second adhesive layer 112 as a medium.
Thus, in the pressing step described later, if the sheet is separated from the multilayer sheet a having the first area toward the shield sheet 300 having the second area by the die 10 and the through-hole 120 is formed in the shield sheet 300, the shield sheet 300 separated from the multilayer sheet a and the through-hole 120 can be manufactured together into the magnetic field shield sheet 100 having the slit 130 formed therein in the form shown in fig. 1.
At this time, the protection film 113 may be a removable release film. Thus, in the process of using the shield sheet 300 produced by the manufacturing method according to the present invention, the protective film 113 may be removed, and after removing the protective film 113, the second adhesive layer 112 disposed on one surface of the shield sheet 300 may be exposed to the outside, so that other components may be attached or the shield sheet 300 may be attached to other components.
As one non-limiting example, as shown in fig. 9, a pair of protective films 113 may be attached to the upper and lower surfaces of the multilayered sheet a, respectively, with the second adhesive layer 112 as a medium. In this case, the second adhesive layer 112 may be coated with an adhesive on both sides of the substrate.
Alternatively, the protective film 113 may be attached to only one of the upper and lower surfaces of the multilayer sheet a with the second adhesive layer 112 as a medium. In this case, the second adhesive layer 112 may be coated with an adhesive on both sides of the substrate.
However, the second adhesive layer 112 is not limited thereto, and the second adhesive layer 112 may be a liquid or gel adhesive.
On the other hand, the step S2 of punching the shield sheet 300 from the multilayer sheet a may separate the shield sheet 300 having the second area relatively narrower than the first area from one multilayer sheet a having the first area by the die 10.
Therefore, the method for manufacturing a magnetic field shielding sheet according to an embodiment of the present invention can produce a plurality of shielding sheets 300 from one multilayered sheet a through a punching process.
In this case, in the method for manufacturing the magnetic shield sheet according to the embodiment of the present invention, the through portion 120 and the slit 130 may be formed in each of the shield sheets 300 separated from the multilayer sheet a in the press step.
That is, in step S2 of punching out the shield sheet 300 from the multilayer sheet a, the edge of the shield sheet 300 and the linear through-hole 120 formed in the inner region of the second area defined by the edge may be formed by the die 10, and the slit 130 induced from the linear through-hole 120 may be formed simultaneously with the linear through-hole 120.
For this purpose, as shown in fig. 9a and 9b, the mold 10 may include a ring-shaped first edge blade 12 for processing the edge of the shield plate 300, and a ring-shaped second edge blade 14 for forming the linear through-hole 120 inside the shield plate 300.
Therefore, in the punching step, if the die 10 is pressed against the multilayer sheet a, the shield sheet 300 separated from the multilayer sheet a is separated into the second area from the multilayer sheet a by the first edge blade 12, and the linear through-hole 120 having the same shape as the second edge blade 14 can be formed in the region inside the shield sheet 300 by the second edge blade 14, and the plurality of slits 130 induced from the edge of the through-hole 120 can be formed.
That is, the shield sheet 300 separated from the multilayer sheet a may have a linear through-hole 120 having a predetermined width and length in the thickness direction at a position corresponding to the second edge blade 14, and a plurality of slits 130 induced from the edge of the linear through-hole 120 may be formed around the linear through-hole 120.
As described above, the method for manufacturing a magnetic field shielding sheet according to an embodiment of the present invention does not require an additional process, and can form the through-hole 120 and the slit 130 induced from the through-hole 120 in the shielding sheet 300 through a single press process for separating the shielding sheet 300 from the multi-layer sheet a, thereby simplifying the manufacturing process.
Accordingly, in the shield sheet 300 produced by the method for producing a magnetic shield sheet according to the embodiment of the present invention, the through portion 120 and the slit 130 induced from the through portion 120 can increase the overall impedance, reduce the loss due to eddy current, improve the Q value, and increase the transmission efficiency of the antenna.
At this time, in the step S2 of punching the shield sheet 300 from the multilayer sheet a, the second edge blade 14 for forming the linear through-hole 120 may partially press only a part of the entire area of the shield sheet 300. As an example, the second edge blade 14 may be formed only in a partial region where the magnetic flux is concentrated in the entire area of the shielding plate 300, and the partial region where the magnetic flux is concentrated may be the corresponding region S described above.
Thus, the shield sheet 300 separated from the multilayer sheet a can simultaneously form the linear through-holes 120 and the slits 130 induced from the linear through-holes 120 for only a part of the entire area of the shield sheet 300.
Here, the second edge blades 14 may be formed in a line shape having a predetermined width and length, and may be formed in one or more appropriate numbers. In addition, the second marginal blade 14 may be formed such that the width has a size of 3 times or more the length.
In addition, the mold 10 may be provided with a plurality of the second edge blades 14 in an inner region of the first edge blade 12. In this case, the plurality of second peripheral blades 14 may be disposed at intervals from each other, or may be formed so that one ends thereof are connected to each other.
As an example, the plurality of second peripheral blades 14 may be disposed at intervals as shown in fig. 9a, and may be radially disposed with reference to a center point of the disposition region S. Thus, the through-hole 120 and the slit 130 in the form shown in fig. 3 can be formed inside the shield sheet 300.
As shown in fig. 9b, the plurality of second edge blades 14 may be disposed with reference to a center point of the corresponding region S, and at least a part of the plurality of second edge blades 14 may be disposed to be connected to each other. Thus, the through-hole 120 and the slit 130 in the form shown in fig. 4 can be formed inside the shield sheet 300.
However, in the mold 10 used in the method for manufacturing a magnetic shielding sheet according to an embodiment of the present invention, the arrangement form of the plurality of second edge blades 14 is not limited to this, and the plurality of second edge blades 14 may be arranged inside the first edge blade 12 in various ways.
That is, the plurality of second edge blades 14 may be arranged in various forms as shown in fig. 10 (a) to (f). As an example, the plurality of second edge blades 14 may be disposed radially with respect to the virtual center point, may be disposed perpendicular or parallel to the width direction or the longitudinal direction of the multilayer sheet a, or may be disposed at an angle inclined by a predetermined angle with respect to the width direction or the longitudinal direction of the multilayer sheet a. The plurality of second peripheral cutting edges 14 may be combined with at least 2 of the 3 types.
Thus, in the process of pressing the shield sheet 300 pressed from the multilayer sheet a by the pressing step using the dies 10 of various shapes shown in fig. 10 (a) to (f), the through portions 120 and the slits 130 of the shapes shown in fig. 5 (a) to (f) can be formed inside the shield sheet 300.
On the other hand, the step S2 of punching the shield sheet from the multi-layered sheet may remove the cut piece C generated from the shield sheet 300 by means of the second edge blade 14 in the process of forming the through part 120 in the shield sheet 300 by the second edge blade 14.
For this, as shown in fig. 9a to 10, the mold 10 may be formed with a separating member 16 inside the second edge blade 14.
Wherein the separating member 16 may be formed in a plane shape having a predetermined width and length, and the width and length of the separating member 16 may be relatively smaller than the width and length of the second marginal blade 14. The separation member 16 may be formed to protrude from the inner bottom surface of the second edge blade 14 by a predetermined height, and the protruding height of the separation member 16 may be the same as the height of the second edge blade 14 or a height relatively lower than the second edge blade 14.
Therefore, in the punching process, if the die 10 is pressed against the multi-layered sheet a, the first edge blade 12 may form an edge of the shield sheet 300, the second edge blade 14 may form a through-portion 120 having a predetermined width and length, and the separation member 16 may press a cut piece C cut from the shield sheet 300 by the second edge blade 14 downward in order to form the through-portion 120.
Accordingly, the cut piece C cut from the shield piece 300 by the second edge blade 14 can be separated from the shield piece 300 by the separation member 16, and the through portion 120 can be formed inside the shield piece 300 by separating the cut piece C.
Therefore, in the method of manufacturing the magnetic field shielding sheet according to the embodiment of the present invention, in order to form the through part 120, the cut-off piece C cut off from the shielding sheet 300 by the second edge blade 14 does not need to be separately separated, and the cut-off piece C can be easily removed in the punching process.
Therefore, the method for manufacturing a magnetic shield sheet according to an embodiment of the present invention can simultaneously perform the process of forming the shield sheet 300 having an appropriate size according to the place and use, the process of forming the through-hole 120 and the slit 130 inside the shield sheet 300, and the process of removing the unnecessary cut piece C generated in the process of forming the through-hole 120, by one press process.
Accordingly, the method for manufacturing a magnetic shield sheet according to an embodiment of the present invention has an advantage that the entire process can be simplified and the production cost can be reduced even when the shield sheet 300 having the through-hole 120 and the slit 130 formed therein is manufactured.
While one embodiment of the present invention has been described above, the idea of the present invention is not limited to the embodiment presented in the present description, and a person skilled in the art understanding the idea of the present invention can easily propose other embodiments by adding, changing, deleting, adding, etc. components within the same idea range, and this also falls within the idea range of the present invention.
Claims (12)
1. A magnetic field shielding sheet which is arranged on one surface of an antenna having a hollow portion with a predetermined area formed in a central portion thereof, the magnetic field shielding sheet comprising:
a sheet body formed of a plurality of multilayer sheets in which a plurality of tape sheets each including at least one of an amorphous alloy and a nanocrystalline alloy are stacked with a first adhesive layer as a medium;
a plurality of through parts formed to penetrate through corresponding regions corresponding to the hollow parts of the antenna, and formed in a line shape having a predetermined width and length; and
a plurality of slits formed in the corresponding region so as to extend from an edge of the through portion toward the sheet body side;
wherein the content of the first and second substances,
the plurality of through parts are arranged at intervals;
the plurality of through parts are arranged in a manner of surrounding the center point of the corresponding area, a part of the corresponding area including the center point of the corresponding area is separated into a plurality of fragments through a plurality of cracks extending from the plurality of through parts;
the sheet body comprises a protective film which is attached to at least any one of the upper surface and the lower surface by taking the second adhesive layer as a medium;
the penetrating portion is formed so as to entirely penetrate the sheet main body and the protective film, and the plurality of slits are formed by an external force applied to the sheet main body in a process of forming the penetrating portion;
the sheet body is partially formed with the through part and the plurality of slits in a partial region where the magnetic flux is concentrated, thereby increasing the overall impedance, thereby reducing the influence caused by the eddy current and having a high magnetic permeability of 2000 or more;
the protective film is a removable release film, and after the protective film is removed, the second adhesive layer disposed on one surface of the magnetic field shielding sheet can be exposed to the outside.
2. The magnetic field shield according to claim 1,
the through-portion is formed so that the width thereof has a size of 3 times or more the length thereof.
3. The magnetic field shield according to claim 1,
the plurality of through portions are formed such that at least a part thereof is connected to each other.
4. The magnetic field shield according to claim 3,
the plurality of through portions are formed such that one end portions are connected to each other at a center point of the corresponding area.
5. The magnetic field shield according to claim 1,
the overall thickness of the magnetic field shielding sheet is 55 ㎛ to 85 ㎛.
6. The magnetic field shield according to claim 1,
the plurality of through parts include at least one or more of the following through parts:
a first through-hole formed in a direction perpendicular to a width direction or a length direction of the sheet main body;
a second through-hole formed in a direction parallel to the width direction or the length direction of the sheet main body; and
and a third through hole formed at a predetermined angle with respect to the width direction or the length direction of the sheet main body.
7. A wireless power receiving module, comprising:
a wireless power receiving antenna having a hollow portion formed in a central portion thereof and having a predetermined area; and
the magnetic field shielding sheet according to any one of claims 1 to 6, which is disposed on one surface of the wireless power receiving antenna.
8. A portable terminal device comprising the wireless power receiving module of claim 7.
9. A method of manufacturing a magnetic field shielding sheet as a magnetic field shielding sheet arranged on one surface of an antenna having a hollow portion with a predetermined area formed in a central portion thereof, the method comprising:
preparing a multilayer sheet having a first area in which a plurality of layers are stacked with a first adhesive layer as a medium, the multilayer sheet including a plurality of tape pieces including at least one of a heat-treated amorphous alloy and a nanocrystalline alloy; and
a step of punching the multilayer sheet with a die so that a plurality of line-shaped through portions having a predetermined width and length can be formed to penetrate through an inner region of a shield piece while the shield piece having a second area relatively narrower than the first area is separated from the multilayer sheet;
the step of punching the multilayer sheet forms a plurality of slits extending from edges of the through portion in the shield piece at the same time as the through portion is formed;
wherein the content of the first and second substances,
the mold includes a first edge blade having a ring shape for processing an edge of the shield plate, a second edge blade having a ring shape disposed inside the first edge blade and for forming an edge of the through-hole, and a separating member formed inside the second edge blade and pressing a cut piece cut from the shield plate by the second edge blade;
the second edge blade is formed so that the width has a size of 3 times or more the length;
the plurality of second edge blades are configured in at least one of the following configurations:
a plurality of antenna elements, each of which is disposed in a radial pattern with respect to a center point of a corresponding region of the multilayer sheet corresponding to the hollow portion of the antenna, is disposed perpendicular to or parallel to a width direction or a length direction of the multilayer sheet, and is disposed at an inclination of a predetermined angle with respect to the width direction or the length direction of the multilayer sheet;
the separation member is formed to protrude from an inner bottom surface of the second edge blade by a predetermined height, and the protruding height of the separation member is the same height as the second edge blade or a height relatively lower than the second edge blade.
10. The method of manufacturing a magnetic field shield sheet according to claim 9,
the linear through-hole is formed to penetrate through a corresponding region corresponding to the hollow portion of the antenna.
11. The method of manufacturing a magnetic field shield sheet according to claim 9,
the cut-off piece is separated from the shield piece by the separation member.
12. The method of manufacturing a magnetic field shield sheet according to claim 9,
a protective film attached to at least either one of the upper and lower surfaces of the multilayer sheet by using a second adhesive layer having an adhesive agent coated on both surfaces of a base material as a medium,
the penetration portion is formed so as to penetrate all of the multilayer sheet and the protective film.
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| Application Number | Priority Date | Filing Date | Title |
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| KR20190072106 | 2019-06-18 | ||
| KR10-2019-0072106 | 2019-06-18 |
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| CN202010220009.9A Active CN112103641B (en) | 2019-06-18 | 2020-03-25 | Magnetic field shielding sheet, method for manufacturing same, wireless power receiving module, and terminal device |
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| US10931152B2 (en) * | 2015-07-20 | 2021-02-23 | Amosense Co., Ltd. | Method of manufacturing magnetic field shielding sheet and magnetic field shielding sheet formed thereby |
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| US10320086B2 (en) * | 2016-05-04 | 2019-06-11 | Nxp B.V. | Near-field electromagnetic induction (NFEMI) antenna |
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| CN112103641A (en) | 2020-12-18 |
| CN211556140U (en) | 2020-09-22 |
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