WO2023027545A1 - 방열형 자기장 차폐시트, 이를 포함하는 안테나 모듈 및 전자기기 - Google Patents
방열형 자기장 차폐시트, 이를 포함하는 안테나 모듈 및 전자기기 Download PDFInfo
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- WO2023027545A1 WO2023027545A1 PCT/KR2022/012814 KR2022012814W WO2023027545A1 WO 2023027545 A1 WO2023027545 A1 WO 2023027545A1 KR 2022012814 W KR2022012814 W KR 2022012814W WO 2023027545 A1 WO2023027545 A1 WO 2023027545A1
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- antenna
- heat
- pattern
- eddy current
- magnetic field
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Images
Classifications
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- 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
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
-
- 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
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
-
- 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
-
- 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
-
- 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
-
- 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
-
- 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
- H01F2027/348—Preventing eddy currents
Definitions
- the present invention relates to a heat dissipating magnetic field shielding sheet, and more particularly, to a heat dissipating magnetic field shielding sheet, an antenna module and an electronic device including the same.
- NFC near field communication
- WPT wireless power transmission
- MST magnetic secure transmission
- a sheet having magnetic properties such as a ribbon sheet of a soft magnetic alloy, a ferrite sheet, or a polymer sheet in which magnetic powder is dispersed, has been used as a magnetic field shielding sheet.
- a sheet in which the ribbon sheet is divided into a plurality of pieces is used to greatly reduce loss due to eddy current or improve the flexibility of the sheet itself.
- the present invention has been made to solve the above-mentioned problems, and can block the influence of the magnetic field on the user's body due to the transmission and reception of wireless signals and improve the magnetic characteristics to improve the efficiency of wireless signal transmission and reception, and the transmission distance. It is an object of the present invention to provide a heat-dissipating magnetic field shielding sheet capable of minimizing or preventing deterioration in transmission and reception efficiency of wireless signals and deterioration of performance of peripheral components due to heat generation that may be caused by magnetic properties, an antenna module including the same, and electronic devices. .
- the present invention provides a heat dissipating magnetic field shielding unit including a plurality of magnetic layers having at least one eddy current reduction pattern unit formed thereon, and a heat dissipating adhesive member disposed between adjacent magnetic layers to improve heat transfer in the thickness direction of the magnetic field shielding unit. It provides a heat dissipation type magnetic shielding sheet having.
- the magnetic field shielding sheet is a magnetic field shielding sheet disposed on one side of an antenna including a hollow portion having a predetermined area in the central portion and a pattern portion surrounding the hollow portion, wherein the eddy current reduction pattern portion It may be provided at a position corresponding to the area where the pattern unit is disposed.
- the magnetic layer may be a ribbon sheet of a soft magnetic alloy containing a transition metal.
- the ribbon sheet may be a sheet containing amorphous or nanocrystalline grains.
- the eddy current reduction pattern portion may be a crack portion in which a magnetic material constituting the magnetic layer within a predetermined area is split into a plurality of pieces, or a penetrating portion penetrating the predetermined area.
- the eddy current reduction pattern portion crosses the first eddy current reduction pattern portion and the second antenna formed to cross both the first and second antennas It may include a second eddy current reduction pattern portion formed to do so.
- first eddy current reduction pattern units are radially arranged around the center of the first antenna, and the second eddy current reduction pattern units are disposed adjacent to each other between at least one pair of first eddy current reduction pattern units. It may be formed to cross the pattern of the second antenna.
- first eddy current reduction pattern part and the second eddy current reduction pattern part may be formed in a linear shape having a predetermined width and length, and the length of the second eddy current reduction pattern part may be smaller than the length of the first eddy current reduction pattern part.
- the second antenna includes a first pattern disposed outside the first antenna and a first connection pattern connected to the first pattern, and the eddy current reduction pattern unit is disposed so as not to overlap with the first connection pattern. It can be.
- the second antenna includes a second pattern disposed inside the first antenna and a second connection pattern connected to the second pattern, and the eddy current reduction pattern unit is disposed so as not to overlap with the second connection pattern. It can be.
- the heat-dissipating adhesive portion may be formed of a heat-dissipating adhesive layer in which a heat-dissipating filler is dispersed in a binder matrix, or may be a heat-dissipating double-sided tape having the heat-dissipating adhesive layer on both sides of a substrate.
- the heat radiation filler may include any one or more of a carbon-based filler, a metal filler, and a ceramic filler.
- the thickness of the magnetic layer may be 15 to 35 ⁇ m, and the thickness of the heat radiation bonding portion may be 3 to 50 ⁇ m.
- it may further include a protection unit having a protective film disposed on one surface of the radiation type magnetic field shielding unit and an attachment unit disposed on the other surface of the radiation type magnetic field shielding unit facing the one surface and fixing the magnetic field shielding sheet to the attaching surface.
- the present invention provides an antenna unit equipped with an antenna including a hollow portion having a predetermined area in the central portion and a pattern portion surrounding the hollow portion, and a heat dissipating magnetic field shielding sheet according to the present invention disposed on one surface of the antenna unit. It provides an antenna module that includes.
- the antenna may include any one or more of a wireless power transmission (WPT) antenna, a magnetic secure transmission (MST) antenna, and a near field communication (NFC) antenna.
- WPT wireless power transmission
- MST magnetic secure transmission
- NFC near field communication
- the present invention provides an electronic device including the antenna module according to the present invention.
- the heat-dissipating magnetic field shielding sheet according to the present invention can reduce the occurrence of eddy currents by increasing the resistance of the entire magnetic field shielding sheet through the eddy current reduction pattern part, while having a very thin thickness and implementing a high magnetic permeability of 2000 or more.
- the eddy current that increases as the eddy current reduction pattern is selectively formed locally in the area corresponding to the antenna among the entire area, and the thickness is thinner according to the recent trend of light, thin, short and miniaturized, and heat due to the increase in eddy current due to the resulting resistance decrease can be rapidly emitted to the outside, thereby minimizing performance degradation of peripheral components such as antennas, and thus can be widely applied to various electronic devices including portable electronic devices.
- FIG. 1 is a perspective view of a heat dissipating magnetic field shielding sheet according to an embodiment of the present invention
- Figure 2 is a cross-sectional and partially enlarged view of Figure 1;
- FIG. 3 is an enlarged cross-sectional view of a heat dissipating magnetic field shield included in an embodiment of the present invention
- FIG. 4 is an enlarged view of an eddy current reduction pattern part included in an embodiment of the present invention.
- Figure 5 is an enlarged cross-sectional view along the XX' boundary of Figure 4.
- 6 to 9 are plan views and partially enlarged views of heat dissipating magnetic field shielding sheets according to various embodiments of the present invention.
- FIG. 10 is an exploded perspective view of an antenna module according to an embodiment of the present invention.
- 11 to 13 are plan views of antenna modules according to various embodiments of the present invention.
- the heat-dissipating magnetic field shielding sheet 100 includes a heat-dissipating magnetic field shielding part 110, and is provided on one surface of the heat-dissipating magnetic field shielding part 110.
- the protection unit 160 may further include an attachment unit 170 provided on the other surface of the heat dissipating magnetic field shielding unit 110 facing the one surface.
- the heat dissipating magnetic field shielding part 110 is disposed between a plurality of magnetic layers 111 , 112 , 113 on which at least one eddy current reduction pattern part 120 is formed and adjacent magnetic layers 111 , 112 , 113 to fix the magnetic layers 111 , 112 , 113 while fixing the magnetic layers 111 , 112 , 113 ) It includes heat dissipating adhesive members 114 and 115 that perform a function of improving heat transfer by rapidly emitting heat generated in the magnetic field shielding unit 110 in the thickness direction.
- the plurality of magnetic layers 111, 112, and 113 may be made of a known magnetic material capable of shielding a magnetic field generated from an antenna and transmitted or received from the outside.
- the magnetic layers 111, 112, and 113 may be soft magnetic alloy ribbon sheets, and specifically, may be soft magnetic alloy ribbon sheets containing transition metals such as iron, nickel, and cobalt.
- transition metals such as iron, nickel, and cobalt.
- Fe-Si -B, Fe-Si-B-Cu, Fe-Si-B-C, Fe-Si-B-C-Cu Fe-B-Cu, Fe-B-C-Cu, Fe-B-C-Cu-Nb and some of Fe or One or two or more alloys, all of which are substituted with Ni or Co, may be included.
- the ribbon sheet of the soft magnetic alloy it may be an amorphous or soft magnetic alloy containing nanocrystalline grains.
- the magnetic layers 111, 112, and 113 may be stacked in the thickness direction, and for example, two or three magnetic layers may be provided, but are not limited thereto, and may be appropriately changed in consideration of desired magnetic characteristics, design conditions, etc. .
- each of the plurality of magnetic layers 111, 112, and 113 may have a thickness of 15 to 35 ⁇ m, and if the thickness of each magnetic layer exceeds 35 ⁇ m, it is difficult to implement a thin magnetic field shielding sheet, and the magnetic field shielding sheet Flexibility may deteriorate.
- the thickness is less than 15 ⁇ m, handling is deteriorated, and there is a high risk of damage to the magnetic layer or additional cracking due to the manufacturing process of the magnetic shielding sheet, the process of attaching to parts such as antennas, or the external force applied during use. There is a risk of change in magnetic properties
- At least one eddy current reduction pattern portion 120 is formed on the magnetic layers 111, 112, and 113, and through this, the overall resistance of the heat-dissipating magnetic field shielding portion 110 is increased, thereby increasing losses due to eddy currents or heating and affecting the antenna due to eddy currents impact can be minimized.
- the eddy current reduction pattern part 120 may have any configuration capable of increasing the overall resistance of the heat dissipating magnetic field shielding part 110 .
- the eddy current reduction pattern part 120 may be formed to occupy any one of the inner regions of the heat dissipating magnetic field shielding part 110 .
- the shape of the eddy current reduction pattern unit 120 occupying the one region is not limited, and may be, for example, a slit shape having a predetermined length and width, but is not limited thereto, and '+', 'x', ' It may be formed to occupy a predetermined area in a shape such as *', ' ⁇ ' or ' ⁇ '.
- the number of the eddy current reduction pattern parts 120 may be one or more, and if the size is slit-shaped, the width may be 0.1 to 0.4 mm, but the specific structure, shape, desired level of eddy current reduction, An appropriate number and size may be provided in consideration of the size of the antenna.
- the eddy current reduction pattern part 120 may be partially formed in a partial area of the entire area of the heat dissipating magnetic field shielding part 110 .
- the eddy current reduction pattern unit 120 may be disposed in some of the areas corresponding to the antenna when the article disposed on one surface of the heat dissipating magnetic field shielding sheet 100 is an antenna, and considering the shape and location of the antenna It can be placed in various locations.
- the pattern portion may be formed at a position corresponding to an area where the pattern portion is disposed.
- the eddy current reduction pattern part 120 is, for example, a crack part 130 in which the magnetic material constituting the magnetic layers 111, 112, and 113 in a predetermined region inside the heat dissipating magnetic field shielding unit 110 is split into a plurality of pieces, or the predetermined It may be composed of a through portion 140 penetrating the area of.
- the crack part 130 among various forms of the eddy current reduction pattern part 120 will be described.
- the crack portion 130 is formed by splitting a magnetic material existing in a predetermined region into a plurality of pieces, and may include a crack 131 .
- the heat dissipating magnetic field shielding part 110 may not be separated into a plurality of pieces except for the crack part 130 in the entire area.
- the crack 131 included in the crack portion 130 may be formed by splitting the magnetic layers 111, 112, and 113 by applying an external force to the laminate in which the plurality of magnetic layers 111, 112, and 113 are stacked through a pressing member or the like.
- the plurality of pieces separated by the crack 131 may be disconnected from each other but maintain a state 131A in contact with each other, or a fine space 131B may be formed between adjacent pieces separated.
- the microscopic space 131B has a very fine width compared to the penetrating portion 140 to be described later, and can be distinguished from the penetrating portion 140 in that it is formed within the magnetic layers 111, 112, and 113. .
- the crack 131 is not formed only within the border dividing the predetermined area described above, and additionally, a plurality of microscopic The crack 132 may be formed by extending it. That is, when pressurizing through the pressing member to form the crack 130 in the heat dissipating magnetic shielding part 110, in addition to the target area, the micro-cracks 132 extending outside the area following the predetermined area are also formed. can be formed
- the crack portion 130 includes a plurality of regular cracks formed in a predetermined shape and a plurality of irregular cracks derived from the plurality of regular cracks. may include
- the crack portion 130 including the crack 131 may increase resistance as the magnetic material is separated into a plurality of pieces, thereby reducing eddy current.
- the penetrating portion 140 which is another example of the eddy current reduction pattern portion 120 , is formed to pass through two surfaces of the heat dissipating magnetic field shielding portion 110 facing each other in the thickness direction.
- it may further include a plurality of microcracks 141 extending outward from the edge of the area occupying the through portion 140, and the microcracks 141 may help reduce eddy current together with the through portion 140.
- the plurality of micro-cracks 141 formed from the penetrating portion 140 may or may not be connected to each other. Also, only some of the plurality of micro-cracks 141 may be connected to each other. Accordingly, the overall resistance of the heat dissipating magnetic field shielding sheet 100 according to an embodiment of the present invention may be increased through the through portion 140 formed in the heat dissipating magnetic field shielding portion 110 and the plurality of microcracks 141. and, through this, eddy currents can be reduced.
- the penetrating part 140 may be formed in a slit shape having a length longer than the width, as shown in FIG.
- the plurality of through-portions 140 are formed along one direction so that the plurality of through-holes 140 form a dotted line shape as a whole. may be arranged linearly at intervals of
- the eddy current eddy current reduction pattern unit 120 may include a first eddy current reduction pattern unit 121 and a second eddy current reduction pattern unit 122 .
- the first eddy current reduction pattern unit 121 is an eddy current reduction pattern unit 120 formed to cross both the first antenna 220 and the second antenna 230 constituting the antenna units 200 and 200'. can At this time, as shown in FIGS. 8 and 9 , the first eddy current reduction pattern unit 121 is extended to have a relatively long length compared to the second eddy current reduction pattern unit 122 to be described later, thereby providing a first antenna 220 and the second antenna 230 may be disposed to cross each other.
- the magnetic field shielding sheet 100 according to an embodiment of the present invention has a predetermined area and only the first eddy current reduction pattern portion 121 formed in a single shape generates eddy currents for the plurality of antennas 220 and 230. can reduce the impact.
- the second eddy current reduction pattern unit 122 may be formed to cross only one antenna among the first antenna 220 and the second antenna 230 .
- the second eddy current reduction pattern unit 122 reduces the influence of eddy current on a local area that is difficult to cover only with the first eddy current reduction pattern unit 121 covering a wide area can make it
- the heat dissipating adhesive members 114 and 115 are disposed between adjacent magnetic layers 111 , 112 and 113 to fix the magnetic layers 111 , 112 and 113 and quickly release heat generated in the magnetic layers 111 , 112 and 113 in the thickness direction of the magnetic shielding part 110 to improve heat transfer. function to improve. That is, conventionally, in order to reduce eddy current, the entire region of the magnetic layer was divided into a plurality of pieces and formed separately, but since the above-described eddy current reduction pattern unit 120 is formed only in a certain region, it is difficult to avoid the problem of heat generation due to eddy current.
- the above-described heat dissipation adhesive members 114 and 115 quickly transfer heat that may be generated due to the eddy current reduction pattern portion 120 formed only in a certain area to other heat dissipation members such as a heat sink, thereby reducing the performance of nearby electronic components such as antennas. can be beneficial to prevent
- the heat dissipating adhesive members 114 and 115 are not limited in the case of members designed to have predetermined adhesive performance and heat dissipation performance at the same time.
- they are made of a heat dissipating adhesive layer in which the heat dissipating filler 114b is dispersed in a binder matrix 114a, or a heat dissipating adhesive layer. It may be a heat dissipating double-sided tape provided on both sides of the substrate.
- the binder matrix 114a may be formed of a known binder resin having adhesive properties.
- the binder resin may be one or a mixture of two or more of an alkyd resin, an epoxy resin, a urethane resin, a vinyl chloride resin, an acrylic resin, a silicone resin, a fluorine resin, a polyester resin, a phenol resin, a melamine resin, and the like.
- the binder matrix 114a may further include a known curing agent and a curing accelerator for curing these binder resins.
- the heat dissipation filler 114b may include a known filler having heat dissipation performance without limitation, and may include, for example, at least one of a carbon-based filler, a metal filler, and a ceramic filler.
- the carbon-based filler may include, for example, at least one of carbon black, graphite, graphene, acetyl black, carbon nanotube, fullerene, and carbon fiber.
- the metal filler may be aluminum, copper, silver, platinum, gold, nickel, stainless steel, magnesium, iron, or an alloy or mixture of two or more thereof.
- the ceramic filler may include one or more of magnesium oxide, titanium dioxide, aluminum nitride, silicon nitride, boron nitride, aluminum oxide, silica, zinc oxide, silicon carbide, barium titanate, strontium titanate, beryllium oxide and manganese oxide. there is.
- the particle diameter of the heat dissipating filler 114b may be 10 nm to 10 ⁇ m, but is not limited thereto, and may be appropriately changed in consideration of the thickness of the heat dissipating adhesive layer.
- the heat dissipating filler 114b may be contained in an amount of 10 to 300 parts by weight based on 100 parts by weight of the binder matrix 114a.
- the shape of the heat dissipating filler 114b may be substantially spherical, but is not limited thereto, and may be plate-shaped, fibrous, rod-shaped, or irregular.
- the thickness of the heat dissipating adhesive members 114 and 115 may be 3 to 50 ⁇ m.
- the substrate may be a known film, for example, a PET film, and may have a thickness of 5 to 30 ⁇ m.
- a protection unit 160 for protecting the exposed magnetic layer 111 may be further provided on one surface of the heat-dissipating magnetic field shielding unit 110 described above.
- the protection unit 160 may be used without limitation in the case of a known protection member, and for example, the first adhesive layer 162 may be formed on one surface of the protective film 161, and the first adhesive layer 162 may be used as a medium.
- a furnace protection film 161 may be fixed to one surface of the heat dissipating magnetic field shielding unit 110 .
- the protective film 161 may be a known polymer film, for example, polyethylene, polypropylene, polyimide, cross-linked polypropylene, nylon, polyurethane-based resin, acetate, polybenzimidazole, polyimideamide, polyetherimide, Polyphenylene sulfide (PPS), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) and polychlorotrifluoroethylene (PCTFE), polyethylenetetrafluoroethylene (ETFE), and the like, which may be used alone or in combination.
- the protective film 161 may have a thickness of 1 to 100 ⁇ m, preferably 10 to 30 ⁇ m, but is not limited thereto.
- the first adhesive layer 162 may be a layer formed of a known adhesive, and the material thereof is an alkyd resin, an epoxy resin, a urethane resin, a vinyl chloride resin, an acrylic resin, a silicone resin, a fluorine resin, a polyester resin, a phenol resin, It may be one type or a mixture of two or more types of melamine resin and the like. Meanwhile, in order to achieve more improved heat dissipation performance, the first adhesive layer 162 may further include a heat dissipation filler. In addition, the thickness of the first adhesive layer 140b may be 3 to 30 ⁇ m, but is not limited thereto and may be changed according to the purpose.
- the protection part 160 may also include the penetrating part at a position corresponding to the penetrating part 140. there is.
- the heat-dissipating magnetic field shielding part may further include an attachment part 170 on a surface opposite to one surface on which the protection part 160 is formed.
- the attaching portion 170 is for fixing the heat dissipating magnetic field shielding sheet 100 to an adherend surface and may include a known adhesive layer or adhesive layer.
- the attaching part 170 may have a second adhesive layer 172 and a third adhesive layer 173 formed on both sides of the base film 171, or may be formed of only an adhesive layer omitting the base film 171. .
- the material of the second adhesive layer 172 and the third adhesive layer 173 may be a known adhesive, a detailed description thereof is omitted in the present invention.
- the third adhesive layer 173 may be composed of an adhesive layer in order to improve reworkability on the surface to be adhered to, and the adhesive layer may be formed of a known adhesive component such as acrylic.
- the material of the base film 171 is the same as the description of the material of the above-described protective film, a detailed description thereof will be omitted.
- the second adhesive layer 172 and the third adhesive layer 173 may each independently have a thickness of 5 to 50 ⁇ m.
- the base film 171 may have a thickness of 10 to 100 ⁇ m.
- the eddy current reduction pattern part 120 is partially formed in a partial area corresponding to the area where the antenna is disposed to increase the overall resistance of the sheet itself, thereby reducing the eddy current It can have a high permeability of 2000 or more in a very thin thickness while minimizing the influence by
- the magnetic shielding sheet 100 according to an embodiment of the present invention may have a high magnetic permeability of 2000 or more even with a very thin thickness of 55 ⁇ m to 85 ⁇ m.
- the magnetic field shielding sheet 100 can increase the inductance of at least one antenna while implementing thinning through a very thin thickness.
- the eddy current reduction pattern unit 120 reduces the eddy current only for a partial area corresponding to the pattern unit of the antenna 211 based on the center point of the internal hollow part E of the antenna 211.
- the pattern unit 120 may be formed, and the partial area where the pattern unit P of the antenna 211 is disposed may be, for example, the arrangement area A1 shown in FIG. 10 .
- the eddy current reduction pattern portion 120 formed on a partial area corresponding to the pattern portion P of the antenna 211 may be radially formed, for example.
- the arrangement of the eddy current reduction pattern part 120 in the magnetic shielding sheet 100 according to an embodiment of the present invention is not limited to this, and if formed at a position corresponding to the antenna 211, the eddy current reduction pattern Section 120 can be formed in a variety of ways.
- the heat dissipating magnetic field shielding sheet 100 may be implemented as an antenna module together with an antenna unit including an antenna performing a predetermined function.
- the antenna module 400 is disposed on one surface of the antenna unit 200 including the first antenna 220 and the antenna unit 200 to shield the magnetic field and to reduce the magnetic field. It may include a heat dissipating magnetic field shielding sheet 100 that focuses in a desired direction and transmits Joule heat generated according to eddy current to the outside.
- the antenna unit 200 may be a combo antenna unit including a second antenna 230 disposed to surround the periphery of the first antenna 220 in addition to the first antenna 220, and the first antenna 220 and the second antenna 230 may be an antenna pattern formed on one surface of the circuit board 210 .
- the first antenna 220 may be, for example, a wireless power transmission (WPT) antenna
- the second antenna 230 may be an antenna for wireless communication, for example, an NFC antenna.
- WPT wireless power transmission
- the eddy current reduction pattern unit 120 has the first antenna 220 and the second antenna 230 of the total area of the heat dissipating magnetic field shielding unit 110 It may be formed only in an area corresponding to the area where the first antenna 220 is disposed, or may be formed only in an area corresponding to the area where the first antenna 220 is disposed, unlike shown in FIG. 11 . That is, the eddy current reduction pattern part 120 may not be formed in the remaining areas of the combo antenna unit 200 except for the area corresponding to the area where the first antenna 220 is disposed. In particular, the eddy current reduction pattern part 120 may not be formed in an area corresponding to the area where the second antenna 230 is disposed.
- the eddy current reduction pattern unit 120 includes the first eddy current reduction pattern unit 121 and the second eddy current reduction pattern unit 122 as shown in FIGS. 8 and 9
- the antenna units 200' and 200'' to which the heat dissipating magnetic field shielding sheet 100 is applied will be described.
- the antenna units 200' and 200'' may be combo antenna units including the first antenna 220 and the second antenna 230 as described above.
- the first antenna 220 is disposed on one side of the circuit board 210 as shown in FIGS. 12 and 13 and has a radiation pattern 221 that is wound multiple times around a central portion E having a predetermined area.
- the second antenna 230 may include a first pattern 231 , a second pattern 232 , and connection patterns 233 and 234 .
- first pattern 231 , the second pattern 232 , and the connection patterns 233 and 234 may each refer to a portion of the entire second antenna 230 .
- first pattern 231, the second pattern 232, and the connection patterns 233 and 234 may be formed in a form physically connected to each other, or may be formed independently of each other.
- first pattern 231, the second pattern 232, and the connection patterns 233 and 234 may all be formed of the same type of antenna, or may be formed by mixing different types of antennas.
- first pattern 231, second pattern 232, and connection patterns 233 and 234 may all be formed as NFC antennas, or may be formed by mixing NFC antennas and MST antennas.
- the second antenna 230 may be formed by including all of the first pattern 231, the second pattern 232, and the connection patterns 233 and 234, or may be formed by including only some of the above-described patterns. there is.
- the first pattern 231 is a part of the second antenna 230 disposed outside the radiation pattern 221 described above, and as shown in the drawing, the first pattern 231 is spaced apart from the radiation pattern 221 by a predetermined distance. It can be. In this case, the first pattern 231 may be disposed in a space between the radiation pattern 221 and the outer rim of the shield 110 to improve wireless communication sensitivity of the space.
- the first pattern 231 may be extended in a straight line shape as shown in the drawing, or may be extended in a circular winding shape similar to the radiation pattern 221, and may be formed in a straight and circular pattern. It may be formed including all. Meanwhile, the first pattern 231 shown in the drawing is only an example of the first pattern 231, and the first pattern 231 is the outer side of the first antenna 220 among the patterns of the second antenna 230. Any form may be used as long as it is a part disposed in.
- the second pattern 232 is disposed on the inner side of the radiation pattern 221, that is, at the central portion E of the first antenna 220, and is wound to form a circular loop similar to the first antenna 220. It can be arranged in the form of
- the second pattern 232 may be disposed to increase the sensitivity of the second antenna in the area adjacent to the central portion E, for example, wireless communication sensitivity.
- connection patterns 233 and 234 may be disposed in an overlapping manner with the radiation pattern 221 of the first antenna 220 unlike the above-described first pattern 231 and second pattern 232 .
- connection patterns 233 and 234, among various patterns of the second antenna 230 overlapping the first antenna 220, as shown in FIGS. 12 and 13, the radiation pattern 221 may refer to a partial area extending in the radial direction of
- connection patterns 233 and 234 may include the first connection pattern 233 having one end connected to the first pattern 231 described above. At this time, the first connection pattern 233 directly connects the first pattern 231 to a terminal or another pattern without bypassing the radiation pattern 221 on the circuit board 210 having a limited area. ) can be arranged in the form of crossing.
- connection patterns 233 and 234 may include a second connection pattern 234 having one end connected to the second pattern 232 .
- the second connection pattern 234 may be disposed to cross the radiation pattern 221 in order to connect the second pattern 232 disposed inside the radiation pattern 221 to a terminal or another pattern side.
- a third pattern 235 may be disposed in an area adjacent to an outer edge of the heat dissipating magnetic field shielding unit 110 .
- the third pattern 235 directs heat emitted from the antenna units 200' and 200'' to a separate heat dissipation member (not shown) or a sensor member (not shown) for sensing the temperature. can be arranged for delivery.
- the first eddy current reduction pattern unit 121 is the first eddy current reduction pattern unit 121 as shown in FIGS. 12 and 13. It may include a plurality of linear patterns radially arranged around the central portion E of the antenna 220 . Through this, the first eddy current reduction pattern unit 121 may cross both the first antenna 220 and the second antenna 230 as described above. Specifically, the first eddy current reduction pattern unit 121 intersects the radiation pattern 221 of the first antenna 220 and simultaneously generates the first pattern 231 and the second pattern 232 of the second antenna 230 may intersect with at least one of them.
- the first eddy current reduction pattern portion 121 may cross both the first pattern 231 and the second pattern 232 formed outside and inside the radiation pattern 221, through which the first eddy current reduction
- the effect of eddy current on the respective parts 231 and 232 of the second antenna 230 spaced apart from each other with the first antenna 220 interposed therebetween can be reduced only by the pattern unit 121 .
- the application of the heat dissipating magnetic field shielding sheet 100 according to an embodiment of the present invention is not limited thereto, and according to the design, the first eddy current reduction pattern unit 120 includes the first pattern 231 and the second pattern ( 232) may be arranged to intersect only one of them.
- the first eddy current reduction pattern unit 121 may be formed to avoid an area where the first antenna 220 and the second antenna 230 overlap each other.
- the first eddy current reduction pattern unit 121 includes a portion of the radiation pattern 221 in which the first connection pattern 233 connected to the first pattern 231 is disposed or the second pattern
- the second connection pattern 234 connected to 232 may be disposed in an area other than a partial area where the second connection pattern 234 is disposed.
- the inventors of the present invention compared the case where the eddy current reduction pattern unit 120 is arranged to overlap the connection patterns 233 and 234 and the case where it is disposed avoiding the connection patterns 233 and 234 and conducted an experiment.
- the eddy current reduction pattern unit 120 is arranged to overlap with the connection patterns 233 and 234, performance degradation such as the recognition distance of the NFC antenna corresponding to the second antenna was confirmed, whereas the connection patterns 233 and 234 ), it was confirmed that the performance of the NFC antenna corresponding to the second antenna 230 is improved.
- the heat dissipating magnetic field shielding sheet 100 avoids the area where the first antenna and the second antenna overlap each other and arranges the eddy current reduction pattern unit 120, thereby introducing the eddy current reduction pattern unit It is possible to prevent degradation of antenna performance due to Meanwhile, the second eddy current reduction pattern unit 122 may be disposed between at least one pair of first eddy current reduction pattern units 121 disposed adjacent to each other to cross the pattern of the second antenna 230 .
- the second eddy current reduction pattern unit 122 is arranged to partially intersect only the first pattern 231 disposed outside the radiation pattern 221 as shown in FIGS. 12 and 13, 1 It is possible to reduce the effect of eddy current on the antenna pattern disposed in one region between the eddy current reduction pattern units 121 .
- the drawing shows that the second eddy current reduction pattern portion 122 is formed only outside the radiation pattern 221, the second eddy current reduction pattern portion 122 is between the first eddy current reduction pattern portion 121 However, it may be formed to cross the second pattern 232 provided inside the radiation pattern 221 .
- the second eddy current reduction pattern unit 122 may be disposed in a plurality of areas requiring eddy current reduction on the heat dissipating magnetic field shielding unit 110, and the plurality of first eddy current reduction pattern units Depending on the size of the space formed between 121, the second eddy current reduction pattern parts 122 may have different areas.
- the heat-dissipating magnetic field shielding sheet 100 includes the second eddy current reduction pattern portion 122 having a relatively small area loss, so that it is formed with a relatively large area and thus the shielding portion 110 While minimizing the number of first eddy current reduction pattern parts 121 that can lower magnetic permeability, it is possible to secure antenna performance by partially supplementing the eddy current reduction effect.
- the antenna units 200, 200', and 200'' may further include an antenna for magnetic secure transmission (MST).
- MST magnetic secure transmission
- the antenna modules 400, 400', 400'' serve as reception antennas for receiving a predetermined signal by the first antenna 220 or the first antenna 220 and the second antenna 230. It may be implemented as a receiving module, or may be implemented as a transmitting module in which the first antenna 220 or the first antenna 220 and the second antenna 230 transmit signals to the outside.
- the antenna module 400 can be applied to portable terminal devices such as mobile phones and tablet PCs.
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Abstract
Description
Claims (16)
- 적어도 1개의 와전류감소패턴부가 형성된 다수 개의 자성층, 및인접하는 자성층 사이에 배치되어 자기장 차폐부의 두께방향 열전달을 개선시키기 위한 방열접착부재를 포함하는 방열형 자기장 차폐부;를 구비하는 방열형 자기장 차폐시트.
- 제1항에 있어서,상기 방열형 자기장 차폐시트는 중앙부에 소정의 면적을 갖는 중공부 및 상기 중공부를 둘러싸는 패턴부를 포함하는 안테나의 일면에 배치되는 자기장 차폐시트로서, 상기 와전류감소패턴부는 상기 패턴부가 배치되는 영역에 대응되는 위치에 구비되는 방열형 자기장 차폐시트.
- 제1항에 있어서,상기 자성층은 천이금속을 포함하는 연자성 합금의 리본시트인 방열형 자기장 차폐시트.
- 제1항에 있어서,상기 와전류감소패턴부는 소정의 영역 내 자성층을 이루는 자성재료가 다수 개의 조각으로 쪼개진 크랙부이거나 상기 소정의 영역을 관통하는 관통부인 방열형 자기장 차폐시트.
- 제1항에 있어서,제1 안테나 및 제2 안테나에 부착되는 방열형 자기장 차폐시트로서, 상기 와전류감소패턴부는 상기 제1 안테나 및 제2 안테나와 모두 교차하도록 형성되는 제1 와전류감소패턴부 및 상기 제2 안테나와 교차하도록 형성되는 제2 와전류감소패턴부를 포함하는 방열형 자기장 차폐시트.
- 제5항에 있어서,상기 제1 와전류감소패턴부는 상기 제1 안테나의 중앙부를 중심으로 복수 개가 방사상으로 배치되고, 상기 제2 와전류감소패턴부는 서로 인접하게 배치되는 적어도 한 쌍의 상기 제1 와전류감소패턴부 사이에 상기 제2 안테나의 패턴과 교차하도록 형성되는 방열형 자기장 차폐시트.
- 제5항에 있어서,상기 제1 와전류감소패턴부 및 상기 제2 와전류감소패턴부는 소정의 폭과 길이를 갖는 선형으로 형성되고, 상기 제2 와전류감소패턴부의 길이는 상기 제1 와전류감소패턴부의 길이 보다 작은 방열형 자기장 차폐시트.
- 제5항에 있어서,상기 제2 안테나는 상기 제1 안테나의 외측에 배치되는 제1 패턴 및 상기 제1 패턴과 연결되는 제1 연결 패턴을 포함하고,상기 와전류감소패턴부는 상기 제1 연결 패턴과 중첩되지 않도록 배치되는 방열형 자기장 차폐시트.
- 제5항에 있어서,상기 제2 안테나는 상기 제1 안테나의 내측에 배치되는 제2 패턴 및 상기 제2 패턴과 연결되는 제2 연결 패턴을 포함하고,상기 와전류감소패턴부는 상기 제2 연결 패턴과 중첩되지 않도록 배치되는 방열형 자기장 차폐시트.
- 제1항에 있어서,상기 방열접착부재는 바인더 매트릭스 내 방열필러가 분산된 방열접착층으로 이루어지거나 또는 상기 방열접착층을 기재 양면에 구비한 방열 양면테이프인 방열형 자기장 차폐시트.
- 제10항에 있어서,방열필러는 탄소계 성분, 금속 성분 및 세라믹 성분 중 어느 하나 이상을 포함하는 방열형 자기장 차폐시트.
- 제1항에 있어서,상기 자성층의 두께는 15 ~ 35㎛이며, 상기 방열접착부의 두께는 3 ~ 50㎛인 방열형 자기장 차폐시트.
- 제1항에 있어서,상기 방열형 자기장 차폐부의 일면에 배치되는 보호필름을 구비하는 보호부와상기 일면에 대향하는 방열형 자기장 차폐부의 타면에 배치되며, 피부착면에 자기장 차폐시트를 고정시키기 위한 부착부를 더 포함하는 방열형 자기장 차폐시트.
- 중앙부에 소정의 면적을 갖는 중공부 및 상기 중공부를 둘러싸는 패턴부를 포함하는 안테나가 구비된 안테나 유닛; 및상기 안테나유닛의 일면 상에 배치되는 제1항 내지 제13항 중 어느 한 항에 따른 방열형 자기장 차폐시트를 포함하는 안테나모듈.
- 제14항에 있어서,상기 안테나는 무선전력전송(WPT)용 안테나, 마그네틱 보안전송(MST)용 안테나 및 근거리무선통신(NFC)용 안테나 중 어느 하나 이상을 포함하는 안테나모듈.
- 제14항에 따른 안테나모듈을 포함하는 전자기기.
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KR20170038749A (ko) * | 2015-09-30 | 2017-04-07 | 주식회사 아모센스 | 무선전력 전송용 자기장 차폐유닛, 이를 포함하는 무선전력 전송모듈 및 휴대용 기기 |
KR20170043276A (ko) * | 2015-10-13 | 2017-04-21 | 삼성전기주식회사 | 자기장 차폐 시트 및 이를 포함하는 무선 충전 장치 |
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KR20170006237A (ko) * | 2015-10-02 | 2017-01-17 | 주식회사 아모그린텍 | 무선충전용 방열시트 |
KR20170043276A (ko) * | 2015-10-13 | 2017-04-21 | 삼성전기주식회사 | 자기장 차폐 시트 및 이를 포함하는 무선 충전 장치 |
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