CN211556141U - Magnetic field shielding sheet, wireless power receiving module and portable terminal device thereof - Google Patents
Magnetic field shielding sheet, wireless power receiving module and portable terminal device thereof Download PDFInfo
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- CN211556141U CN211556141U CN202020397287.7U CN202020397287U CN211556141U CN 211556141 U CN211556141 U CN 211556141U CN 202020397287 U CN202020397287 U CN 202020397287U CN 211556141 U CN211556141 U CN 211556141U
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- sheet
- magnetic field
- antenna
- field shielding
- wireless power
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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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Provided are a magnetic field shielding sheet, a wireless power receiving module and a portable terminal device thereof. The utility model discloses a magnetic field shielding piece of an embodiment is as disposing the magnetic field shielding piece on the well kenozooecium that has predetermined area on central part and the one side of the antenna of the pattern portion that encircles well kenozooecium, include: 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 portions formed to penetrate through an arrangement region corresponding to the pattern portion of the antenna, and formed in a line shape having a predetermined width and length; and a plurality of slits formed in the arrangement region so as to extend from an edge of the through-hole toward the sheet main body. The magnetic field shielding sheet of the utility model can embody high magnetic conductivity more than 2000 while having very thin thickness.
Description
Technical Field
The utility model relates to a magnetic field shielding piece, wireless power receiving module and portable terminal equipment 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 shielding sheet passes between the pair of rollers, all of the magnetic shielding sheet produced by the sheet making process is necessarily formed by separating 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.
SUMMERY OF THE UTILITY MODEL
Solves the technical problem
The present invention has been made in view of the above problems, and an object of the present invention is to provide a magnetic field shielding sheet which can form a slit in the entire area corresponding to an antenna, has a very 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 of manufacturing a magnetic shield sheet, which can selectively form slits in a region corresponding to an antenna over the entire area, without performing a separate sheet manufacturing process.
Technical scheme
In order to achieve the above object, the present invention provides a magnetic field shield sheet disposed on one surface of an antenna including a hollow portion having a predetermined area in a central portion thereof and a pattern portion surrounding the hollow portion, the magnetic field shield sheet including: 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 portions formed to penetrate through an arrangement region corresponding to the pattern portion of the antenna, and formed in a line shape having a predetermined width and length; and a plurality of slits formed in the arrangement region so as to extend from an edge of the through-hole toward the sheet main body.
The through-hole may be formed such that the width thereof is 3 times or more the length thereof.
The plurality of through portions may be disposed at intervals from each other.
In addition, the through portion may include a first portion formed in an arrangement region corresponding to the pattern portion of the antenna and a second portion extending from the first portion to a position corresponding to the hollow portion of the antenna.
In addition, the plurality of through portions may be connected to each other by the second portion.
In addition, the plurality of through portions may be formed such that the respective second portions are connected to each other at a center point of the antenna hollow portion.
In addition, the plurality of through parts may 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; a third through hole formed at a predetermined angle with respect to the width direction or the length direction of the sheet main body; and a fourth through-hole formed in an arc shape having a predetermined curvature.
The sheet main body may include a protective film attached to at least one of the upper surface and the lower surface via an adhesive layer.
In addition, the overall thickness of the magnetic field shielding sheet may be 55 to 85 μm.
On the other hand, the utility model provides a wireless power receiving module, include: 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.
Effect of the utility model
According to the utility model discloses, can embody the high magnetic permeability more than 2000 when having very thin thickness.
In addition, the present invention can selectively form the slit in the area corresponding to the antenna in the whole area even without performing the additional sheet making process. Therefore, the utility model discloses can simplify manufacturing procedure, reduce the production unit price.
Drawings
Figure 1 is a diagram showing a magnetic field shielding sheet according to an embodiment of the present invention,
figure 2 is a cross-sectional view of the magnetic field shield shown in figure 1,
fig. 3 is a view conceptually showing a through portion which can be formed in an arrangement region corresponding to the pattern portion of the antenna in fig. 1 and a slit induced from the through portion,
FIG. 4 is a conceptual view showing another form of through portions and cracks induced from the through portions which can be formed in the arrangement region corresponding to the pattern portion of the antenna in FIG. 1,
FIG. 5 is a conceptual diagram illustrating various types of through portions and cracks induced thereby which can be formed in the arrangement region corresponding to the pattern portion of the antenna in FIG. 1,
figure 6 is a diagram showing a wireless power receiving module of 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 according to one embodiment of the present invention,
fig. 9a and 9b are views showing one form of a mold that can be used in the method for manufacturing a magnetic shielding sheet according to an embodiment of the present invention, and,
fig. 10 is a diagram showing various forms of the second edge blade in the mold that can be used in the method for manufacturing the 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, 120c, 120 d: through portion 130: crack(s)
200: the wireless power receiving module 210: circuit board
211: antenna, wireless power reception 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 embodiments of the present invention. The present invention can be embodied in a variety of 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.
The magnetic shielding sheet 100 according to an embodiment of the present invention is shown in fig. 1 and 3, and 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 be able to shield a magnetic field generated from the antenna 211.
The antenna 211 may include a hollow portion E having a predetermined area in a central portion thereof and a pattern portion P formed to surround the hollow portion E by a predetermined number of turns. In this case, the antenna 211 may be an antenna pattern formed by patterning at least one surface of the circuit board 210, or may be a flat-type coil in which a conductive member having a predetermined wire diameter is wound in a plurality of turns.
The antenna 211 may be an antenna for wireless power transmission that transmits or receives wireless power, an MST antenna for magnetic settlement, or an NFC antenna for near field communication.
The antenna 211 may be a combination type including two or more of the wireless power transmission antenna, the MST antenna, and the 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 together with 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 edges of the through part 120 by an external force applied to the sheet body 110 in the process of forming the through part 120 by the sheet body 110.
Therefore, the magnetic field shielding sheet 100 according to an embodiment of the present invention can 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 can 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 for a partial area of the entire area of the sheet body 110.
As an example, the through portion 120 and the plurality of slits 130 may be formed in an arrangement region S in which the pattern portions P of the antenna 211 are arranged in the entire area of the sheet body 110, and the through portion 120 may include a portion extending from the arrangement region S to the hollow portion E of the antenna 211 in addition to the arrangement region S.
Accordingly, in the magnetic shielding sheet 100 according to an embodiment of the present invention, the through portion 120 and the plurality of slits 130 are partially formed in a partial region where the pattern portion P of the antenna 211 is disposed, 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 with 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 thinned and increase the inductance of the antenna 211 by a small thickness.
Specifically, as shown in fig. 1 and 6, when the antenna 211 is disposed on one surface of the magnetic field shielding sheet 100 according to an embodiment of the present invention, the through portion 120 and the plurality of slits 130 extending from the through portion 120 may be formed in the disposition region S in which the pattern portion P of the antenna 211 is disposed in the entire area of the sheet body 110.
In this case, the through portion 120 may include a first portion 121 formed in a disposition region S where the pattern portions P of the antenna are disposed and a second portion 122 extended from the first portion 121 to a position corresponding to the antenna hollow portion E, and the plurality of slits 130 may include a portion formed from the second portion 122.
As an example, as shown in fig. 3 and 4, a plurality of through portions 120 may be formed in the arrangement region S, a plurality of through portions 120 formed in the arrangement region S may be arranged 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 formed in a radial shape with reference to a center point of the antenna hollow portion E, and the plurality of through portions 120 may be formed without being connected to each other.
Alternatively, as shown in fig. 4, the plurality of through parts 120 may be radially formed with reference to a center point of the antenna hollow part E, and the plurality of through parts 120 may be formed such that at least a portion thereof is connected to each other in a region corresponding to the antenna hollow part E. In this case, the plurality of through parts 120 may be formed such that the second part 122 may be formed at a region corresponding to the hollow part E of the antenna, and the plurality of second parts 122 are connected to each other at the center point of the hollow part E of the antenna.
Thereby, the plurality of through portions 120 may be connected to each other by the second portion 122 to form one through portion. Here, a partial region including center points connected to each other by the second portion 122 may be separated into a plurality of pieces by slits 130 respectively extended from the second portion 122 at a position corresponding to the hollow portion E of the antenna.
Therefore, in the region corresponding to the antenna hollow portion E, a part of the area including the center point of the hollow portion E can be formed in a form similar to a sheet separately formed by 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 portion 120, and the through portion 120 may be formed in various ways as long as it is formed in the arrangement region S.
That is, the plurality of through holes 120 may be formed by at least one through hole including the first through hole 120a, the second through hole 120b, the third through hole 120c, and the fourth through hole 120d, and the plurality of through holes 120 may be variously formed in the arrangement 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 to be inclined at a predetermined angle with respect to the width direction or the length direction of the sheet main body 110, and the fourth through hole 120d may be an arc-shaped through hole having a predetermined curvature.
The magnetic field shielding sheet 100 according to an embodiment of the present invention may be embodied as 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 in which the pattern portion P is patterned so that the hollow portion E having a predetermined area is formed in the central portion of at least one surface of the circuit board 210, or may be a flat-type coil in which a plurality of turns are wound with a conductive member having a predetermined wire diameter.
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 antenna 211 for wireless power reception.
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, a method for manufacturing a magnetic field shielding sheet according to an embodiment of the present invention may include: a step S1 of preparing a magnetic 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 first adhesive layer 111b 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 shielding sheet 300 from the multilayer sheet a may separate the shielding 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 a magnetic field shielding sheet according to an embodiment of the present invention, the through portion 120 and the slit 130 may be formed in each of the shielding sheets 300 separated from the multilayer sheet a in the pressing step.
That is, in the step S2 of punching out the shield sheet 300 from the multilayer sheet a, the edge of the shield sheet 300 may be formed by the die 10, and the linear through-hole 120 may be formed in the inner region of the second area defined by the edge, 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 at the same time, 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 portion 120 and the slit 130 induced from the through portion 120 in the shielding sheet 300 through a single punching process for separating the shielding sheet 300 from the multi-layer sheet a, thereby simplifying the manufacturing process.
Therefore, the shield sheet 300 produced by the method for producing a magnetic field shield sheet according to an embodiment of the present invention can increase the overall impedance, reduce the loss due to eddy current, improve the Q value, and increase the transmission efficiency of the antenna by the through portion 120 and the slit 130 induced from the through portion 120.
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 in a partial region in which the pattern part P of the antenna 211 is disposed in the entire area of the shield sheet 300, and the partial region in which the pattern part P of the antenna 211 is disposed may be the above-described disposition region S.
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.
The second edge blades 14 may be formed in a linear 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. In this way, the shield sheet 300 can form the through-hole 120 and the slit 130 in the arrangement region S in the form shown in fig. 3.
As shown in fig. 9b, the plurality of second edge blades 14 may be disposed with reference to a center point of the disposition region S, and at least a part of the plurality of second edge blades 14 may be disposed so as to be connected to each other. In this way, the shield sheet 300 can form the through-hole 120 and the slit 130 in the arrangement region S in the form shown in fig. 4.
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, or may be disposed perpendicular or parallel to the width direction or the length direction of the multilayer sheet a. The plurality of second edge blades 14 may be disposed at a predetermined angle with respect to the width direction or the longitudinal direction of the multilayer sheet a, or may be formed in an arc shape having a predetermined length. The plurality of second peripheral cutting edges 14 may be combined with at least 2 of the 4 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 of 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 multilayer sheet a, the first edge blade 12 forms the edge of the shield sheet 300, the second edge blade 14 forms the through portion 120 having a predetermined width and length, and the separating member 16 can press the 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 out 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 for manufacturing the magnetic field shielding sheet according to the embodiment of the present invention, in order to form the through portion 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 field shielding sheet according to an embodiment of the present invention can realize the processing of the shielding sheet 300 having a size suitable for the place and use, the processing of forming the through portion 120 and the slit 130 inside the shielding sheet 300, and the removal of the unnecessary cut piece C generated in the process of forming the through portion 120, together with the processing of performing the one-time press process.
Accordingly, the method for manufacturing a magnetic field shielding sheet according to an embodiment of the present invention can simplify the overall process and reduce the production cost even when manufacturing the shielding sheet 300 having the through-hole 120 and the slit 130.
While the 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 who understands the idea of the present invention can easily present other embodiments by adding, changing, deleting, adding, etc. the constituent elements within the same idea scope, and this also belongs to the idea scope of the present invention.
Claims (11)
1. A magnetic field shielding sheet, which is disposed on one surface of an antenna including a hollow portion having a predetermined area in a central portion thereof and a pattern portion surrounding the hollow portion, includes:
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 portions formed to penetrate through an arrangement region in which the pattern portions of the antenna are arranged, and formed in a line shape having a predetermined width and length; and
and a plurality of slits formed in the arrangement region so as to extend from an edge of the through-portion toward the sheet main body.
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 arranged at intervals from each other.
4. The magnetic field shield according to claim 1,
the through portion includes a first portion formed in an arrangement region in which the pattern portion of the antenna is arranged, and a second portion extending from the first portion to a position corresponding to the hollow portion of the antenna.
5. The magnetic field shield according to claim 4,
the plurality of through portions are connected to each other by the second portion.
6. The magnetic field shield according to claim 4,
the plurality of through portions are formed such that the respective second portions are connected to each other at a center point of the antenna hollow portion.
7. The magnetic field shield according to claim 1,
the sheet body includes a protective film attached to at least either one of the upper surface and the lower surface with a second adhesive layer as a medium.
8. The magnetic field shield according to claim 1,
the magnetic field shielding sheet has an overall thickness of 55 to 85 μm.
9. 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;
a third through hole formed at a predetermined angle with respect to the width direction or the length direction of the sheet main body; and
and a fourth through part formed in an arc shape having a predetermined curvature.
10. 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 9, which is disposed on one surface of the wireless power receiving antenna.
11. A portable terminal device characterized by comprising the wireless power receiving module according to claim 10.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2019-0072105 | 2019-06-18 | ||
| KR20190072105 | 2019-06-18 |
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| CN211556141U true CN211556141U (en) | 2020-09-22 |
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| CN202010220569.4A Active CN112103642B (en) | 2019-06-18 | 2020-03-25 | Magnetic field shielding sheet, method for manufacturing same, wireless power receiving module, and terminal device |
| CN202020397287.7U Active CN211556141U (en) | 2019-06-18 | 2020-03-25 | Magnetic field shielding sheet, wireless power receiving module and portable terminal device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160057246A (en) * | 2014-11-13 | 2016-05-23 | 엘지이노텍 주식회사 | Soft magnetic alloy and shielding sheet for antenna comprising the same |
| KR101629653B1 (en) * | 2015-04-02 | 2016-06-13 | 주식회사 아모그린텍 | Heat radiation unit for a wireless charging and wireless charging module having the same |
| KR101559939B1 (en) * | 2015-07-07 | 2015-10-14 | 주식회사 아모그린텍 | Heat radiation unit for a wireless charging |
| US10673269B2 (en) * | 2015-07-20 | 2020-06-02 | Amosense Co., Ltd. | Magnetic field shielding unit |
| 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 |
| KR102475403B1 (en) * | 2015-10-05 | 2022-12-07 | 주식회사 아모그린텍 | Magnetic field shielding sheet, manufacturing method thereof, and short range communication module including the same |
| KR101939663B1 (en) * | 2015-10-30 | 2019-01-17 | 주식회사 아모센스 | Shielding sheet for wireless charging and wireless charging receive module having the same |
| WO2017090977A1 (en) * | 2015-11-23 | 2017-06-01 | 주식회사 아모센스 | Magnetic field shielding unit and multi-functional complex module including same |
| KR20170093029A (en) * | 2016-02-04 | 2017-08-14 | 주식회사 아모센스 | Shielding unit for a wireless power transmission module and a wireless power transmission module having the same |
| CN109545535A (en) * | 2018-10-18 | 2019-03-29 | 上海万兹新材料科技有限公司 | A kind of preparation method of the magnetic screen piece on wireless charging and NFC |
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2020
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| CN112103642A (en) | 2020-12-18 |
| CN112103642B (en) | 2021-11-09 |
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