CN211556142U - 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 PDF

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Publication number
CN211556142U
CN211556142U CN202020398204.6U CN202020398204U CN211556142U CN 211556142 U CN211556142 U CN 211556142U CN 202020398204 U CN202020398204 U CN 202020398204U CN 211556142 U CN211556142 U CN 211556142U
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Prior art keywords
sheet
magnetic field
sheets
wireless power
power receiving
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CN202020398204.6U
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Chinese (zh)
Inventor
张吉在
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Amosense Co Ltd
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Amosense Co Ltd
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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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0075—Magnetic shielding materials
    • 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
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • 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
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (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 embodiment includes: a sheet main body formed of a plurality of sheets made of the same material, and a plurality of multi-layer sheets stacked with an adhesive layer as a medium; the plurality of sheets are sequentially laminated by sheets having a relatively larger surface resistance and a relatively smaller magnetic permeability. The utility model discloses a magnetic field shielding piece can embody the high magnetic permeability more than 2000 when increasing the surface resistance of sheet itself and reducing the loss that eddy current leads to.

Description

Magnetic field shielding sheet, wireless power receiving module and portable terminal device thereof
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 made 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 in which a plurality of pieces are separated, so that loss due to Eddy Current (Eddy Current) can be greatly reduced or flexibility of the sheet itself can be improved.
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.
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 surface resistance of the shield sheet is increased as the sheet-making process is repeated, but there is a problem that the magnetic 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 reducing the influence of eddy current by increasing the surface resistance 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 capable of reducing a loss due to an eddy current and exhibiting a high magnetic permeability of 2000 or more.
Technical scheme
In order to achieve the above object, the present invention provides a magnetic field shielding sheet, including: a sheet main body formed of a plurality of sheets made of the same material, and a plurality of multi-layer sheets stacked with an adhesive layer as a medium; the plurality of sheets are sequentially laminated by sheets having a relatively larger surface resistance and a relatively smaller magnetic permeability.
The plurality of sheets may be ribbon sheets including at least one of an amorphous alloy and a nanocrystalline alloy.
In addition, any one of the plurality of sheets may include a plurality of through parts formed in a line shape having a predetermined width and length inside and a plurality of slits formed to extend from edges of the through parts.
As one example, the plurality of through portions and the plurality of slits may be formed at corresponding regions where the pattern portions of the antenna are arranged.
As another example, the plurality of through portions and the plurality of slits may be formed at corresponding regions corresponding to the hollow portion of the antenna.
In this case, the plurality of through portions may be arranged at intervals.
In addition, any one of the plurality of pieces may be a sheet material separated into a plurality of pieces.
The sheet main body may include a protective film attached to at least one of the upper surface and the lower surface with an adhesive medium.
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 including a hollow portion having a predetermined area in a central portion thereof and a pattern portion surrounding the hollow portion; and a magnetic field shielding sheet disposed on one surface of the wireless power receiving antenna.
In this case, the magnetic field shielding sheet may be disposed such that the sheet having a relatively large surface resistance and a small magnetic permeability is located closest to the wireless power receiving antenna.
In another aspect, the present invention provides a portable terminal device including the wireless power receiving module as described above.
Effect of the utility model
According to the present invention, the sheet itself can be increased in surface resistance to reduce the loss caused by eddy current, and the high permeability of 2000 or more can be realized.
Drawings
Figure 1 is a diagram showing a magnetic field shielding sheet according to an embodiment of the present invention,
figure 2 is a diagram of the forced separation of a plurality of sheets in figure 1,
3 figure 3 3 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 figure 31 3, 3
Fig. 4 is a view of forcibly separating a plurality of sheets from a magnetic field shielding sheet according to another embodiment of the present invention,
figure 5 is a combined cross-sectional view of figure 4,
fig. 6 is a view of forcibly separating a plurality of sheets from a magnetic field shielding sheet according to still another embodiment of the present invention,
figure 7 is a combined cross-sectional view of figure 6,
fig. 8a to 8d are views showing various sheets to which the magnetic field-shielding sheet according to one embodiment of the present invention can be applied, and,
fig. 9 is a diagram showing a wireless power receiving module to which a magnetic field shield sheet according to an embodiment of the present invention is applied.
Description of reference numerals
100. 200 and 300: magnetic field shield sheet 110, 210, 310: sheet body
111. 211: first sheet 112, 212: second sheet
113. 213: a third sheet a: adhesive layer
120: protective film 121: adhesive layer
130: through portion 140: crack(s)
1000: the wireless power receiving module 400: circuit board
410: antenna and wireless power receiving antenna
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 of an embodiment of the present invention is shown in fig. 1 to 3, and includes a sheet body 110.
The sheet body 110 may be formed of a material having magnetism so as to shield a magnetic field generated from the antenna 410.
As an example, the sheet body 110 may use a tape sheet, a ferrite sheet, a polymer sheet, or the like including at least one of an amorphous alloy and a nanocrystalline alloy.
Here, the antenna 410 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 a predetermined number of times. In this case, the antenna 410 may be an antenna pattern formed by patterning at least one surface of the circuit board 400, 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 410 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 410 may be a combination type 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 multi-layer sheet in which a plurality of sheets 111 and 112 are stacked with an adhesive layer a as a medium, and the plurality of sheets 111 and 112 may be formed of different materials and may exert different functions.
As an example, the sheet body 110 may be configured in a form of a combination of a sheet material that performs an effect of increasing surface resistance to reduce loss due to eddy current and a sheet material that can secure high magnetic permeability to exhibit high inductance.
That is, the plurality of sheets 111 and 112 constituting the sheet main body 110 may be made of the same material, and may be configured such that at least one of the surface resistance and the magnetic permeability has a value different from each other.
For this, the sheet body 110 may be a multi-layered sheet in which a plurality of sheets 111, 112 made of the same material and having different characteristics are stacked. The sheet main bodies 110, 210, and 310 may be stacked by the plurality of sheets 111 and 112 in such a manner that at least any one of the characteristics increases or decreases along the stacking direction.
Specifically, the sheet body 110 may be a multilayer sheet in which a plurality of sheets 111, 112 having a relatively large surface resistance and having a relatively small magnetic permeability are sequentially stacked. In this case, the sheet body 110 may increase in surface resistance and decrease in permeability from the lower layer to the upper layer.
Thus, the magnetic field shielding sheet 100 according to an embodiment of the present invention can reduce the loss caused by eddy current by the second sheet 112 having relatively large surface resistance among the plurality of sheets 111 and 112, and can embody high inductance by the first sheet 111 having relatively high magnetic permeability among the plurality of sheets 111 and 112. In this case, the first sheet having a relatively high magnetic permeability among the plurality of sheets 111, 112 may have a magnetic permeability of 2000 or more.
Therefore, in the magnetic field shielding sheet 100 according to an embodiment of the present invention, even if the plurality of sheets 111 and 112 are made of the same material, it is possible to simultaneously secure a function of exhibiting a high inductance by the sheet portion having a high magnetic permeability and a function of reducing a loss due to an eddy current by the sheet portion having a large surface resistance.
Therefore, the magnetic field shielding sheet 100 according to an embodiment of the present invention can reduce eddy current loss by a large surface resistance and exhibit a high inductance by a high magnetic permeability while keeping a thin thickness even if the plurality of sheets 111 and 112 are made of the same material.
As an example, the magnetic field shielding sheet 100 according to an embodiment of the present invention can exhibit a high inductance by a high magnetic permeability while having a very thin thickness of 55 μm to 85 μm as a whole, and reducing eddy current loss by a large surface resistance.
In this case, in the magnetic field shielding sheet 100 according to an embodiment of the present invention, the surface resistance and the magnetic permeability of the respective sheets 111 and 112 constituting the sheet bodies 110, 210, and 310 can be adjusted by the presence or absence of the penetration portion 130 and by whether or not the penetration portion is formed separately.
That is, the respective sheets 111 and 112 constituting the sheet main body 110 may be a sheet in which a plurality of through portions 130 formed in a linear shape having a predetermined width and length are formed inside as shown in fig. 8b and 8c, a sheet formed by separating a plurality of pieces as shown in fig. 8d, or a sheet formed by not forming the through portions 130 and not separating a plurality of pieces as shown in fig. 8 a.
In this case, the sheet having the plurality of through-holes 130 may include a plurality of slits 140 formed to extend from edges of the through-holes 130, as shown in fig. 8b and 8c, and the plurality of through-holes 130 and the plurality of slits 140 may be formed partially in a part of the entire area of the sheet. The sheet having the plurality of through holes 130 may be made of a material containing a metal component so that the plurality of slits 140 can be formed together with the through holes 130.
As an example, the through part 130 may be formed through each piece, and the plurality of slits 140 may be formed to be extended from an edge of the through part 130. The plurality of slits 140 formed from the edge of the through-hole 130 may be connected to each other, or may not be connected to each other, or some of the plurality of slits 140 may be connected to each other and the rest may not be connected to each other. Also, the plurality of slits 140 may be induced from the edges of the through portion 130 by an external force applied to the sheet in the process of forming the through portion 130.
The through-holes 130 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 130 may be formed to have a width 3 times or more the length. The total number of the plurality of slits 140 may be relatively larger than the total number of the through portions 130.
The through-hole 130 may be a linear through-hole formed in a direction perpendicular to the width direction or the longitudinal direction of each sheet, or may be a linear through-hole formed in a direction parallel to the width direction or the longitudinal direction of each sheet. The through-hole 130 may be a linear through-hole formed at a predetermined angle with respect to the width direction or the length direction of each sheet, or may be an arc-shaped through-hole having a predetermined curvature.
On the other hand, when the sheet material constituting the sheet main body 110 includes the plurality of through portions 130 and the plurality of slits 140, the plurality of through portions 130 and the plurality of slits 140 may be formed in the corresponding region S in which the pattern portions P of the antenna 410 are arranged, as shown in fig. 8b, or may be formed in the corresponding region S in which the hollow portion E formed in the center portion of the antenna 410 is arranged, as shown in fig. 8 c.
In addition, a plurality of the through portions 130 may be formed in the corresponding region S, and the plurality of through portions 130 formed in the corresponding region S may be arranged at intervals. The plurality of through holes 130 may be formed radially with respect to the center point of the hollow antenna portion E, and the plurality of through holes 130 may be formed without being connected to each other.
However, the formation method of the plurality of through holes 130 is not limited to this, and the plurality of through holes 130 may be formed locally at random positions regardless of the arrangement position of the antenna 410, or the plurality of through holes 130 may be formed so that a part thereof is connected to each other.
In the present invention, in the sheet including the plurality of through portions 130 and the plurality of slits 140, the magnetic permeability is reduced as the total formation number and the total formation area of the plurality of through portions 130 and the plurality of slits 140 are increased, and conversely, the surface resistance is increased.
In addition, the sheet material itself formed by separating a plurality of pieces may have a relatively small magnetic permeability and a relatively large surface resistance as compared to the sheet material including the plurality of through portions 130 and the plurality of slits 140.
Thus, in the magnetic shielding sheet 100 according to an embodiment of the present invention, by combining the sheets shown in fig. 8a to 8d with each other to form the plurality of sheets 111 and 112 constituting the sheet body 110, it is possible to reduce eddy current loss by a large surface resistance and realize a high inductance by a high magnetic permeability by the plurality of sheets 111 and 112 made of the same material.
As a specific example, as shown in fig. 1 to 3, a magnetic field shielding sheet 100 according to an embodiment of the present invention may include a first sheet 111 and a second sheet 112, and the first sheet 111 and the second sheet 112 may be strip sheets including at least one of amorphous alloy and nanocrystalline alloy.
The first sheet 111 may be a sheet that is not separated into a plurality of pieces without forming the through-hole 130 and the slits 140, and the second sheet 112 may be a sheet that is formed with a plurality of through-holes 130 and slits 140 in a region corresponding to the pattern portion P of the antenna 410.
Thus, the first sheet 111 may be a sheet material having a small surface resistance and a high magnetic permeability, and the second sheet 112 may have a relatively smaller magnetic permeability than the first sheet 111 and, on the contrary, may have a large surface resistance.
Accordingly, the magnetic field shielding sheet 100 according to an embodiment of the present invention can exhibit a high magnetic permeability by the first sheet 111, and reduce a loss due to an eddy current by the second sheet 112.
However, the magnetic field shielding sheet 100 according to an embodiment of the present invention is not limited thereto, and any one of the sheets shown in fig. 8a to 8d may be used instead as appropriate as long as the first sheet 111 and the second sheet 112 have a relatively reduced magnetic permeability and an increased surface resistance in the stacking direction.
Further, the sheet bodies 210 and 310 of the magnetic shielding sheets 200 and 300 according to the embodiment of the present invention may be formed of a multilayer sheet having 3 or more layers in which the sheets shown in fig. 8a to 8d are combined with each other.
As an example, the magnetic field shielding sheet 200, 300 according to an embodiment of the present invention may be a multi-layered sheet in which the sheet body 210, 310 includes the first sheet 111, 211, the second sheet 112, 212, and the third sheet 113, 213, as shown in fig. 4 to 7.
In this case, as shown in fig. 4 and 5, the first sheet 111 may be a sheet which is not separated into a plurality of pieces without forming the through-hole 130 and the slits 140, the second sheet 112 may be a sheet which is formed with a plurality of through-holes 130 and slits 140 in a region corresponding to the pattern portion P of the antenna 410, and the third sheet 113 may be a sheet which is separated into a plurality of pieces.
Alternatively, as shown in fig. 6 and 7, the first sheet 211 may be a sheet that is not separated into a plurality of pieces without forming the through portion 130 and the plurality of slits 140, the second sheet 212 may be a sheet that is formed with a plurality of through portions 130 and a plurality of slits 140 in a region corresponding to the hollow portion E of the antenna 410, and the third sheet 213 may be a sheet that is formed with a plurality of through portions 130 and a plurality of slits 140 in a region corresponding to the pattern portion P of the antenna 410.
On the other hand, the magnetic shielding sheet 100, 200, 300 according to an embodiment of the present invention may include a protective film 120 attached to at least one of the upper surface and the lower surface of the sheet body 110, 210, 310 using an adhesive layer 121 as a medium.
Therefore, even if the respective sheets constituting the sheet main bodies 110, 210, and 310 are formed by separating a plurality of fragments or the penetrating portions 130 and the plurality of slits 140 are formed inside the sheets, the sheet main bodies 110, 210, and 310 can be maintained in a plate-like form by the protective film 120.
The magnetic shielding sheets 100, 200, and 300 according to an embodiment of the present invention may be embodied in a wireless power receiving module 1000 for wireless power transmission.
That is, as shown in fig. 9, the wireless power receiving module 1000 may include: a wireless power reception antenna 410 for wireless power reception; and a magnetic field shielding sheet 100 disposed on one surface of the wireless power receiving antenna 410, for shielding a magnetic field and concentrating the magnetic field in a desired direction.
The wireless power receiving antenna 410 may be an antenna pattern in which a pattern portion P is patterned so that a hollow portion E having a predetermined area is formed in the central portion of at least one surface of the circuit board 400, or may be a flat-type coil in which a conductive member having a predetermined wire diameter is wound around a plurality of turns.
In addition, the magnetic field shielding sheet 100 constituting the wireless power receiving module 1000 may be the magnetic field shielding sheet 100 described above. In the drawings, the form shown in fig. 1 to 3 is shown as the magnetic shielding sheet 100, but the present invention is not limited thereto, and the magnetic shielding sheets 200 and 300 shown in fig. 4 to 7 may be applied.
In the wireless power receiving module 1000, the antenna may be constituted by only the wireless power receiving antenna 410, but may include various antennas that perform different functions.
As an example, the wireless power receiving module 1000 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 410.
In the wireless power receiving module 1000, the magnetic shielding sheets 100, 200, and 300 may be disposed such that a sheet having a relatively large surface resistance and a low magnetic permeability is located closest to the wireless power receiving antenna 410 among the plurality of sheets constituting the sheet main bodies 110, 210, and 310.
That is, as shown in fig. 9, the magnetic field shielding sheet 100 includes a second sheet 112 stacked on top of a first sheet 111, and when the wireless power receiving antenna 410 is disposed on the upper surface of the second sheet 112, the second sheet 112 may be a sheet having a relatively larger surface resistance and a smaller magnetic permeability than the first sheet 111.
Also, the wireless power receiving module 1000 may be applied to portable terminal devices such as a cellular phone, a tablet computer, and the like.
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 (12)

1. A magnetic field shield sheet, comprising:
a sheet main body formed of a plurality of sheets made of the same material, and a plurality of multi-layer sheets stacked with an adhesive layer as a medium;
the plurality of sheets are sequentially laminated by sheets having a relatively larger surface resistance and a relatively smaller magnetic permeability.
2. The magnetic field shield according to claim 1,
the plurality of sheets are strip sheets comprising at least one of amorphous alloy and nanocrystalline alloy.
3. The magnetic field shield according to claim 1,
any one of the plurality of sheets is a sheet including a plurality of through parts formed in a line shape having a predetermined width and length inside and a plurality of slits formed to extend from edges of the through parts.
4. The magnetic field shield according to claim 3,
the plurality of through portions and the plurality of slits are formed in corresponding regions where the pattern portions of the antenna are arranged.
5. The magnetic field shield according to claim 3,
the plurality of through portions and the plurality of slits are formed in corresponding regions corresponding to the hollow portion of the antenna.
6. The magnetic field shield according to claim 4,
the plurality of through portions are arranged at intervals from each other.
7. The magnetic field shield according to claim 1,
any one of the plurality of pieces is a sheet material separated into a plurality of pieces.
8. The magnetic field shield according to claim 1,
the sheet body includes a protective film attached to at least one of the upper surface and the lower surface with an adhesive layer as a medium.
9. The magnetic field shield according to claim 1,
the magnetic field shielding sheet has an overall thickness of 55 to 85 μm.
10. A wireless power receiving module, comprising:
a wireless power receiving antenna including a hollow portion having a predetermined area in a central portion thereof and a pattern portion surrounding the hollow portion; 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. The wireless power receiving module according to claim 10,
the magnetic field shielding sheet is disposed such that a sheet having a relatively large surface resistance and a small magnetic permeability is located closest to the wireless power receiving antenna.
12. A portable terminal device characterized by comprising the wireless power receiving module according to claim 10.
CN202020398204.6U 2019-07-22 2020-03-25 Magnetic field shielding sheet, wireless power receiving module and portable terminal device thereof Active CN211556142U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2019-0088416 2019-07-22
KR20190088416 2019-07-22

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