JP2018023091A - Antenna device and portable terminal including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin antenna device which can be used in many applications such as NFC, and can be manufactured by a simple process without decreasing internal space efficiency of a portable device even when a circuit board to which a magnetic sheet is affixed is mounted as an antenna device.SOLUTION: A thickness is reduced and the manufacturing process is simplified by an antenna device formed by directly forming a conductive foil or an antenna pattern 230 on a magnetic sheet 100. Further, by using a polymer type magnetic sheet, flexibility and excellent magnetic properties are provided.SELECTED DRAWING: Figure 10A

Description

  The present embodiment includes an antenna device that can be used in fields such as near field communication, wireless power charging, and magnetic secure transmission, and the antenna device. It relates to a portable terminal.

  Recently, antennas for realizing functions such as near field communication (NFC), wireless power charging (WPC), and magnetic protection transmission (MST) have become portable devices such as mobile phones, tablet PCs, and notebook PCs. It is installed inside. However, when other metal parts are present in the mobile device and an alternating magnetic field formed in the mobile device is applied to the metal part, an eddy current is generated, thereby reducing the antenna performance and the recognition distance. Brought about.

  Conventionally, in order to solve the above problems, for an antenna device having many applications, one side of a typical circuit board (antenna) such as a polyimide substrate having an antenna pattern layer formed on the other side It was produced by attaching a highly permeable ferrite sheet to the surface. This uses the principle that a magnetic material such as a ferrite sheet collects the magnetic flux of the antenna, thereby suppressing magnetic field penetration (penetration) and eddy current generation into the metal surface, and operating characteristics. Can be improved.

  However, in this case, that is, when the circuit board to which the magnetic sheet is attached is mounted as an antenna device in the portable device, the internal space efficiency that is inevitably limited by mounting various components of the portable device is reduced. Decrease. In addition, since the adhesion between the circuit board and the magnetic sheet is weak, delamination may occur, and when using an adhesive layer to prevent delamination, the total thickness of the antenna device will increase. Absent.

  Therefore, there is a need to develop new and thin antenna devices that can be used for many applications such as NFC, WPC, and MST and that can be made by a simple process.

  For a typical antenna device, a circuit is formed by forming a coiled antenna pattern on one side of the insulating substrate layer and connecting one end and the other end of the antenna pattern to a terminal pattern for input and output, respectively. To generate an electromagnetic signal that can be transmitted to and received from the external terminal. However, if it is possible to place the antenna pattern and the terminal pattern on the same plane, the antenna pattern generally has a coil shape, so that one end or the other end of the antenna pattern is directly connected to the terminal pattern. You may not be able to connect. Therefore, although the antenna pattern and the terminal pattern can be connected by separate wiring, in this case, it is necessary to prevent the occurrence of a short circuit between the wiring and the antenna pattern. However, if an insulation process such as covering the wiring with another taping is further performed for this purpose, the processing efficiency is lowered, and it becomes difficult to manufacture a thin device.

  Further, a typical antenna device generates an electromagnetic signal that can be transmitted to and received from an external terminal by forming a coiled antenna pattern on one side of the insulating substrate layer. However, as shown in FIG. 16, in such an antenna device 20 ′, transmission of the electromagnetic signal 50 ′ to the external terminal 40 ′ is blocked by an electromagnetic wave shielding material such as the metal case 30 ′. It is difficult to apply the antenna device device 20 ′ to a portable terminal having a metal case. In addition, attempts have been made to provide an electromagnetic wave transmission region in order to solve the above problems, but in order to enable effective signal transmission and reception in consideration of the electromagnetic signal transmission characteristics of typical antenna devices, It is necessary to significantly increase the area of the transmission region.

  Therefore, an object of the present embodiment is to provide a thin antenna device that has magnetic characteristics that can be used for many applications such as NFC, WPC, and MST that can be manufactured by a simple process, and that can transmit and receive in many different cases. There is to serve. Another object of the present embodiment is to provide a portable terminal having an antenna device.

  According to one embodiment, an antenna device comprising a magnetic sheet; an antenna pattern disposed on one or both sides of the magnetic sheet; and at least one penetrating the magnetic sheet and connected to the antenna pattern An antenna device is provided comprising two vias.

  In the above embodiment, the antenna pattern includes the first antenna pattern disposed on one side of the magnetic sheet, and the antenna device further includes a wiring pattern disposed on the other side of the magnetic sheet. And the via may have a first via that penetrates the magnetic sheet and is connected to one end of the first antenna pattern and one end of the wiring pattern.

Further, in the above embodiment, the antenna pattern is arranged in parallel so as to be separated from each other on the other side of the magnetic sheet, and a plurality of first conductive line patterns arranged in parallel to be separated from each other on one side of the magnetic sheet. A plurality of second conductive line patterns, the extending direction of the first conductive line pattern and the extending direction of the second conductive line pattern are the same, and the via penetrates the magnetic sheet, and the first conductive line pattern It may be composed of a plurality of vias connecting the pattern and the second conductive line pattern.

  According to another embodiment, a portable terminal comprising a case and an antenna device disposed in the case, the case comprising an electromagnetic wave transmission region and an electromagnetic wave non-transmission region, The device includes: a magnetic sheet; a plurality of first conductive line patterns arranged parallel to each other on one side of the magnetic sheet; a plurality of second conductive lines arranged parallel to each other on the other side of the magnetic sheet A plurality of vias penetrating the magnetic sheet, the extending direction of the first conductive line pattern is the same as the extending direction of the second conductive line pattern, and the electromagnetic wave transmitting region is the first conductive line A portable terminal is provided which is arranged in parallel with the pattern and the second conductive line pattern.

  In the antenna device according to the present embodiment, the thickness is reduced by directly forming a conductive foil (or conductive foil) or an antenna pattern on the magnetic sheet without using an insulating substrate such as polyimide. In addition, the manufacturing process can be simplified. In addition, the antenna device according to the present embodiment has excellent flexibility and excellent magnetic characteristics by using a polymer type magnetic sheet, and is used for many applications such as NFC, WPC, and MST. can do.

  According to a specific embodiment, the antenna pattern and the wiring pattern are arranged on different surfaces of the magnetic sheet, respectively, and these patterns are connected via vias penetrating the magnetic sheet, thereby short-circuiting the single-sided antenna device. In order to prevent this, an additional step such as covering the wiring is not required, so that the process efficiency can be improved. In addition, since the antenna device according to the present embodiment can prevent an increase in thickness due to the covering of the insulating wiring, the thin characteristics of the antenna device can be further improved.

  According to another specific embodiment, the antenna device comprises a first conductive line pattern and a second conductive line pattern respectively arranged on different sides of the magnetic sheet, and both ends of these patterns have vias. As a result, the coils surrounding the core region of the magnetic sheet can be formed. Therefore, electromagnetic signals can be effectively transmitted and received through the end of the core region of the magnetic sheet, so that the communication sensitivity of the antenna device can be improved.

  Furthermore, the portable terminal according to the present embodiment can transmit and receive electromagnetic signals in a narrow gap between cases using an antenna device. Thereby, even if it uses the case which consists of electromagnetic signal shielding materials, such as a metal, an electromagnetic signal can be effectively transmitted / received with an external terminal via a narrow electromagnetic wave transmission area | region.

FIG. 1 shows a cross-sectional view of a magnetic sheet according to an embodiment. FIG. 2A shows a cross-sectional view of a conductive magnetic composite sheet according to one embodiment. FIG. 2B shows a cross-sectional view of the conductive magnetic composite sheet according to one embodiment. FIG. 3 shows a manufacturing process of a magnetic sheet according to an embodiment. FIG. 4 shows a process for producing a conductive magnetic composite sheet according to an embodiment. FIG. 5 shows a roll-to-roll process. FIG. 6 shows a batch process. FIG. 7 shows a manufacturing process of a conductive magnetic composite sheet according to an embodiment. FIG. 8 shows a process for producing a conductive magnetic composite sheet according to an embodiment. FIG. 9 shows a cross-sectional view of an antenna device according to one embodiment. FIG. 10A shows a plan view of an antenna device according to one embodiment. (The portion indicated by the black pattern is the front pattern, the hatched portion is the rear pattern, and the portion indicated as a circle is the via.) FIG. 10B shows a plan view of an antenna device according to one embodiment. (The portion indicated by the black pattern is the front pattern, the hatched portion is the rear pattern, and the portion indicated as a circle is the via.) FIG. 10C shows a plan view of an antenna device according to one embodiment. (The portion indicated by the black pattern is the front pattern, the hatched portion is the rear pattern, and the portion indicated as a circle is the via.) FIG. 11A shows a plan view of an antenna device according to one embodiment. FIG. 11B shows a cross-sectional view of an antenna device according to one embodiment. FIG. 12A shows a manufacturing process of an antenna device according to an embodiment. FIG. 12B shows a manufacturing process of the antenna device according to the embodiment. FIG. 12C shows a manufacturing process of the antenna device according to the embodiment. FIG. 13 schematically illustrates signal transmission and reception of an antenna device according to an embodiment having external terminals. FIG. 14 schematically shows signal transmission and reception of an antenna device according to an embodiment using external terminals. FIG. 15 shows the heat treatment conditions in the reflow test. FIG. 16 shows signal transmission and reception of a conventional antenna device using an external terminal.

  According to one embodiment, an antenna device comprising a magnetic sheet; an antenna pattern disposed on one or both sides of the magnetic sheet; and at least one penetrating the magnetic sheet and connected to the antenna pattern An antenna device is provided comprising two vias.

  According to the embodiment, the magnetic sheet is a non-sintered sheet having a flexible thickness of 10 μm to 3000 μm, and the magnetic sheet includes the binder resin and the magnetic powder dispersed in the binder resin. It can be done.

  Furthermore, the magnetic sheet has a magnetic permeability of 100 to 300 based on an alternating current with a frequency of 3 MHz, a magnetic permeability of 80 to 270 based on an alternating current with a frequency of 6.78 MHz, and an alternating current with a frequency of 13.56 MHz. It can have a permeability of 60-250.

  According to a specific embodiment, the antenna pattern comprises a first antenna pattern disposed on one side of the magnetic sheet, and the antenna device is a wiring pattern disposed on the other side of the magnetic sheet. And the via may have a first via penetrating the magnetic sheet and connected to one end of the first antenna pattern and one end of the wiring pattern.

  In this case, the first antenna pattern and the wiring pattern are formed from a conductive material, the first antenna pattern is directly bonded to one side of the magnetic sheet, and the wiring pattern is directly bonded to the other side of the magnetic sheet. obtain.

  Further, the first antenna pattern may have a coil shape.

  Further, the magnetic sheet has a first via hole that vertically penetrates the magnetic sheet, and the inner wall of the first via hole can be plated to form the first via.

  And a second terminal penetrating the magnetic sheet, and the second via is connected to the other end of the first terminal pattern and the wiring pattern. Can be connected.

  The magnetic sheet further includes a second terminal pattern disposed on one side of the magnetic sheet, the second terminal pattern being connected to the other end of the first antenna pattern, and the first terminal pattern and the second terminal pattern. The terminal patterns are arranged adjacent to each other.

  It further comprises a first terminal pattern disposed on the other side of the magnetic sheet, and the first terminal pattern can be connected to the other end of the wiring pattern.

  A second terminal pattern disposed on the other side of the magnetic sheet; and a second via penetrating the magnetic sheet, the second via being the other end of the second terminal pattern and the first antenna pattern. And the first terminal pattern and the second terminal pattern may be disposed adjacent to each other.

In another specific embodiment, the antenna pattern has a plurality of first conductive line patterns arranged in parallel to be spaced apart from each other on one side of the magnetic sheet; and parallel to be spaced from each other on the other side of the magnetic sheet. The plurality of second conductive line patterns are arranged, the extending direction of the first conductive line pattern is the same as the extending direction of the second conductive line pattern, and the via penetrates the magnetic sheet, It may be composed of a plurality of vias connecting the conductive line pattern and the second conductive line pattern.

  In this case, the vias are alternately connected to the first conductive line pattern and the second conductive line pattern arranged in parallel so as to be separated from each other, and one second and the other end of any first conductive line pattern are adjacent to each other. One end and the other end of any second conductive line pattern may be connected to two first conductive line patterns adjacent to each other, respectively connected to the conductive line pattern.

  Further, when the magnetic sheet is divided into the core region and the peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are disposed in the peripheral region, while the first conductive line pattern and the first conductive line pattern Two conductive line patterns may traverse the core region and vias may be disposed in the surrounding region to connect the end of the first conductive line pattern and the end of the second conductive line pattern.

  Also, the first conductive line pattern, the second conductive line pattern, and the via can be connected to each other to form a coil that surrounds the core region.

  According to another embodiment, a portable terminal comprising a case and an antenna device disposed in the case, the case comprising an electromagnetic wave transmission region and an electromagnetic wave non-transmission region, The device includes: a magnetic sheet; a plurality of first conductive line patterns arranged parallel to each other on one side of the magnetic sheet; a plurality of second conductive lines arranged parallel to each other on the other side of the magnetic sheet A plurality of vias penetrating the magnetic sheet, the extending direction of the first conductive line pattern is the same as the extending direction of the second conductive line pattern, and the electromagnetic wave transmitting region is the first conductive line A portable terminal is provided which is arranged in parallel with the pattern and the second conductive line pattern.

  In the above aspect, when the magnetic sheet is divided into the core region and the peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are disposed in the peripheral region, while the first conductive line pattern A via may be disposed in the surrounding region to cross the core region and the second conductive line pattern and to connect the end of the first conductive line pattern and the end of the second conductive line pattern.

  In this case, the first conductive line pattern, the second conductive line pattern, and the via may be connected to each other to form a coil that surrounds the core region.

  Furthermore, the antenna device generates an electromagnetic signal in a direction perpendicular to the extending direction of the first conductive line pattern and the second conductive line pattern, and the electromagnetic signal can travel outside the case through the electromagnetic wave transmission region.

  Further, the electromagnetic wave transmission region may include glass or plastic, and the electromagnetic wave non-transmission region may include metal.

  In the description of the embodiments below, when referring to a layer, foil or sheet as “on” or “below” another layer, foil or sheet, the terms “above” and “below” are “directly” Including both “indirect” and “indirect”. Further, the upper and lower sides of each element are described based on the drawings. In the drawings, the size or spacing of each element is exaggerated for better understanding, and may not be shown as something obvious to those skilled in the art.

  FIG. 1 is a cross-sectional view of a magnetic sheet according to an embodiment.

  The magnetic sheet 100 comprises (or comprises or comprises) a magnetic powder 110 and a binder resin 120.

  That is, the magnetic sheet 100 may be a polymer sheet (PMS). Specifically, the magnetic sheet 100 may be a non-sintered cured sheet that includes the magnetic powder 110 and the binder resin 120. Further, the magnetic sheet 100 may be a flexible magnetic sheet.

  The magnetic sheet 100 includes a magnetic powder 110.

  Magnetic powder is oxide magnetic powder such as ferrite (Ni-Zn, Mg-Zn, Mn-Zn ferrite); metal magnetic powder such as permalloy, sendust, Fe-Si-Cr alloy, Fe-Si nanocrystal Or a mixed powder thereof. For example, the magnetic powder may be a sendust powder having a Fe—Si—Al alloy composition.

As a specific example, the magnetic powder may have a composition of Formula 1 below.
In Formula 1, X is aluminum (Al), chromium (Cr), nickel (Ni), copper (Cu), or a combination thereof;
Y is manganese (Mn), boron (B), cobalt (Co), molybdenum (Mo), or combinations thereof; and 0.01 ≦ a ≦ 0.2, 0.01 ≦ b ≦ 0.1 and 0 ≦ c ≦ 0.05.

  The particle size of the magnetic powder ranges from about 3 nm to about 1 mm. For example, the particle size of the magnetic powder may range from about 1 μm to about 300 μm, from about 1 μm to about 50 μm, or from about 1 μm to about 10 μm. When the average particle diameter of the magnetic powder is within the above preferred range, sufficient magnetic properties can be obtained, and short-circuits when vias are formed in the magnetic sheet can be suppressed.

  The magnetic powder can be coated with a functional material. For example, the surface of individual particles of magnetic powder can be anticorrosive or insulating coated.

  For example, the magnetic powder may be coated with an organic material, in particular with a polymer having corrosion resistance and / or insulation.

  Thus, the individual particles of magnetic powder can be composed of a core and a shell surrounding the surface of the core. In this case, the core may include an oxide magnetic material such as ferrite; a metal magnetic material such as permalloy, sendust, Fe—Si—Cr alloy, and Fe—Si nanocrystals; or a mixed composition thereof. The shell may also include a polymer resin that has corrosion resistance and / or insulation. The thickness of the shell may range from 0.1 μm to 20 μm, or 1 μm to 10 μm.

  A curable resin may be used as the binder resin 120. Specifically, the binder resin may include a photocurable resin, a thermosetting resin, and / or a high heat resistant thermoplastic resin. Preferably, the binder resin can include a thermosetting resin.

  Resins that can be cured to exhibit adhesion include resins containing at least one thermosetting functional group or moiety such as a glycidyl group, an isocyanate group, a hydroxyl group, a carboxyl group, or an amide group; or an epoxide group, a cyclic ether group , At least one active energy curable functional group or moiety such as a sulfide group, an acetal group, or a lactone group may be used. Such functional groups or moieties can be, for example, isocyanate groups (—NCO), hydroxyl groups (—OH), or carboxyl groups (—COOH).

  Specifically, examples of the curable resin include a polyurethane resin, an acrylic resin, a polyester resin, an isocyanate resin, or an epoxy resin having at least one functional group or part as described above. It is not limited to these.

  According to one embodiment, the binder resin may include a polyurethane resin, an isocyanate hardener, or an epoxy resin.

The polyurethane-based resin may include repeating units represented by the following formulas 2a and 2b.

In equations 2a and 2b,
R ₁ and R ₃ are each independently a C _1-5 alkylene group, a urea group or an ether group;
R ₂ and R ₄ are each independently a C _1-5 alkylene group; and each C _1-5 alkylene is unsubstituted or selected from the group consisting of halogen, cyano, amino, and nitro Substituted with at least one substituent.

  The polyurethane-based resin may include a repeating unit represented by Formula 2a and a repeating unit represented by Formula 2b in a molar ratio of 1:10 to 10: 1.

  The polyurethane-based resin may have a number average molecular weight of about 500 g / mol to about 50000 g / mol, about 10,000 g / mol to about 50000 g / mol, or about 10,000 g / mol to about 40000 g / mol. The isocyanate curing agent can be an organic diisocyanate.

  For example, the isocyanate curing agent may be an aromatic diisocyanate, an aliphatic diisocyanate, an alicyclic diisocyanate, or a mixture thereof.

Examples of the aromatic diisocyanate include diisocyanates having 1 to 2 C _6-20 aryl groups. Specifically, aromatic diisocyanates include 1,5-naphthalene diisocyanate, 4,4′-diphenylmethane diisocyanate, 4,4′-diphenyl-dimethylmethane diisocyanate, 4,4′-benzyl isocyanate, dialkyl-diphenylmethane diisocyanate, tetra It may be alkyl-diphenylmethane diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, tolylene diisocyanate, or xylene diisocyanate.

The alicyclic diisocyanate may be, for example, a diisocyanate having 1 to 2 C _6-20 cycloalkyl groups. Specifically, the alicyclic diisocyanate is cyclohexane-1,4-diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4′-diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, or methylcyclohexane diisocyanate. Good.

  Preferably, the isocyanate curing agent is an alicyclic diisocyanate, especially isophorone diisocyanate.

  Examples of epoxy resins include, for example, bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins and tetrabromobisphenol A type epoxy resins, bisphenol type epoxy resins, spirocyclic epoxy resins; naphthalene type Epoxy resin; biphenyl type epoxy resin; terpene type epoxy resin; glycidyl ether type epoxy resin such as tris (glycidyloxyphenyl) methane and tetrakis (glycidyloxyphenyl) ethane; glycidylamine type epoxy resin such as tetraglycidyldiaminodiphenylmethane; cresol novolac Type epoxy resin, phenol novolak type epoxy resin, α-naphthol novolak type epoxy resin, brominated phenol novolak type epoxy resin, etc. Novolak type epoxy resins. These epoxy resins may be used alone or in combination of two or more.

  Among these resins, bisphenol A type epoxy resin, cresol novolac type epoxy resin, or tetrakis (glycidyloxyphenyl) ethane type epoxy resin can be used in consideration of adhesiveness and heat resistance.

  The epoxy-based resin can have an epoxy equivalent weight of about 80 g / eq to about 1000 g / eq, or about 100 g / eq to about 300 g / eq. In addition, the epoxy resin may have a number average molecular weight of about 10,000 g / mol to 50000 g / mol.

  Furthermore, the magnetic sheet 100 may contain a corrosion inhibitor. Examples of the corrosion inhibitor may be an organic corrosion inhibitor and an inorganic corrosion inhibitor.

  Specific examples of the organic corrosion inhibitor include amine, urea, mercaptobenzothiazole (MBT), benzotriazole, tolyltriazole, aldehyde, heterocyclic nitrogen compound, sulfur-containing compound, acetylene compound, ascorbic acid, succinic acid, tryptamine or cafe. In.

  For example, corrosion inhibitors include N-benzyl-N, N-bis [(3,5-dimethyl-1H-pyrazol-1-yl) methyl] amine, 4- (1-methyl-1-phenylethyl) -N -[4- (1-Methyl-1-phenylethyl) phenyl] aniline, tris (benzimidazol-2-ylmethyl) amine, N- (2-furfuryl) -p-toluidine, N- (5-chloro-2- Furfuryl) -p-toluidine, N- (5-nitro-2-furfuryl) -p-toluidine, N- (5-methyl-2-furfuryl) -p-toluidine, N- (piperidinomethyl) -3-[(pyridylidene ) Amino] isatin, tetrakis [ethylene-3- (3,5-di-tertiary (tert) butyl-4-hydroxyphenyl) propionate] methane, or a mixture thereof. Good.

  The magnetic sheet may contain 50% by weight or more or 70% by weight or more of magnetic powder. For example, the magnetic sheet is 50% to 95%, 70% to 90%, 70% to 90%, 75% to 90%, 75% to 95%, 80% to 80% by weight. It may contain 95% by weight, or 80% to 90% by weight of magnetic powder. Also in this case, the magnetic powder may have the composition of Formula 1.

  Further, the magnetic sheet may comprise 5 wt% to 40 wt%, 5 wt% to 20 wt%, 5 wt% to 15 wt%, or 7 wt% to 15 wt% binder resin.

  Further, the magnetic sheet is based on the total weight of the magnetic sheet, and the binder resin is 6% to 12% by weight polyurethane resin, 0.5% to 2% by weight isocyanate curing agent, 0.3% by weight. % To 1.5% by weight of epoxy resin may be included.

  Further, the magnetic sheet may comprise 1 wt% to 10 wt%, 1 wt% to 8 wt%, or 3 wt% to 7 wt% corrosion inhibitor.

  According to a specific example, the magnetic sheet comprises 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of polyurethane resin as a binder resin, 0.5% by weight. % To 2% by weight isocyanate curing agent and 0.3% to 1.5% by weight epoxy resin. In this case, the magnetic powder has the composition of Formula 1, the polyurethane resin includes repeating units represented by Formula 2a and Formula 2b, the isocyanate curing agent is an alicyclic diisocyanate, and an epoxy resin. May be a bisphenol A type epoxy resin, a cresol novolac type epoxy resin or a tetrakis (glycidyloxyphenyl) ethane type epoxy resin.

  The thickness of the magnetic sheet can range from about 10 μm to about 3000 μm. For example, the thickness of the magnetic sheet 100 is in the range of about 10 μm to about 500 μm, about 40 μm to about 500 μm, about 40 μm to about 250 μm, about 50 μm to about 250 μm, about 50 μm to about 200 μm, or about 50 μm to about 100 μm. It's okay.

  The magnetic sheet has a permeability of about 100 to about 300 at an AC frequency of 3 MHz, has a permeability of about 80 to about 270 at an AC frequency of 6.78 MHz, and is about an AC at a frequency of 13.56 MHz. It may have a permeability of 60 to about 250.

  The magnetic sheet has a permeability of about 190 to about 250 at an alternating current of 3 MHz, has a permeability of about 180 to about 230 at an alternating current of 6.78 MHz, and has a frequency of 13.56 MHz. The alternating current may have a permeability of about 140 to about 180.

  Further, the magnetic sheet can be flexible for use in various devices.

  For example, a magnetic sheet cannot be cut after 100, 1000, or even 10,000 bends in the MIT bending test under conditions of 90 degrees and 35 RPM. In addition, the change in the magnetic permeability of the magnetic sheet after bending 100 times, 1000 times, or 10,000 times in the MIT bending test under the conditions of 90 degrees and 35 RPM may be about 10% or less or about 5% or less.

  Also, when heat treatment is performed twice, the magnetic sheet can have a thickness change of about 5% or less and a permeability change of about 5% or less. The heat treatment consists of heating from 30 to 240 degrees at a constant rate for 200 seconds and then cooling from 240 to 130 degrees at a constant rate for 100 seconds. Specifically, when the heat treatment is repeated twice, the thickness change of the magnetic sheet can be about 3% or less, and the magnetic permeability change of the magnetic sheet can be about 3% or less. More specifically, the thickness change of the magnetic sheet can be about 1% or less, and the magnetic permeability change of the magnetic sheet can be about 1% or less.

  In addition, the magnetic sheet may have chemical resistance that can withstand various environments. For example, the thickness change of the magnetic sheet when immersed in a 2N hydrochloric acid solution for 30 minutes can be about 5% or less, and the magnetic permeability change of the magnetic sheet can be about 5% or less. The thickness change of the magnetic sheet when immersed in a 2N sodium hydroxide solution for 30 minutes may be about 5% or less, and the magnetic permeability change of the magnetic sheet may be about 5% or less. Specifically, the thickness change of the magnetic sheet when immersed in a 2N hydrochloric acid solution for 30 minutes can be about 3% or less, and the magnetic permeability change of the magnetic sheet can be about 3% or less. The thickness change of the magnetic sheet when immersed in a 2N sodium hydroxide solution for 30 minutes may be about 3% or less, and the magnetic permeability change of the magnetic sheet may be about 3% or less. More specifically, the thickness change of the magnetic sheet when immersed in a 2N hydrochloric acid solution for 30 minutes may be about 1% or less, and the magnetic permeability change of the magnetic sheet may be about 1% or less. The thickness change of the magnetic sheet when immersed in a 2N sodium hydroxide solution for 30 minutes may be about 1% or less, and the magnetic permeability change of the magnetic sheet may be about 1% or less.

  Furthermore, the magnetic sheet may have corrosion resistance that can withstand various corrosive environments. For example, in the salt spray test based on KS D 9502, the number of ratings of the magnetic sheet may be 9.8 or more. For example, the rating number method is an evaluation method in which the degree of corrosion is indicated by the ratio of the corrosion area to the effective area, and the degree of corrosion is evaluated on a scale of 0 to 10.

  Also, when immersed in about 2N NaCl solution for 10 minutes, the weight change of the magnetic sheet can be about 10% or less or about 5% or less. Further, when immersed in about 2N NaCl solution for 10 minutes, the permeability change of the magnetic sheet may be about 10% or less or about 5% or less.

  In addition, when the magnetic sheet is subjected to a high temperature and high humidity condition of 85 ° C. and 85% RH for 72 hours, the thickness change and permeability change of the magnetic sheet are both 10% or less, specifically 5% or less, more specifically May be 2% or less.

  Also, the magnetic sheet can have a high breakdown voltage. For example, the magnetic sheet can have a breakdown voltage of 3 kV or higher, 3.5 kV or higher, or 4 kV or higher. Specifically, the magnetic sheet may have a breakdown voltage of 3 kV to 6 kV, 3.5 kV to 5.5 kV, 4 kV to 5 kV, or 4 kV to 4.5 kV.

Furthermore, the magnetic sheet can have excellent insulating properties. For example, when a current is passed between two points separated from each other by 500 μm or more on the sheet, the resistance value of the magnetic sheet is 1 × 10 ⁵ Ω or more, 1 × 10 ⁷ Ω or more, or 1 × 10 ⁹ Ω or more. obtain. When a current is passed between two points separated from each other by 500 μm or more on the sheet, it is preferable that the resistance value of the magnetic sheet cannot be measured or the resistance value of the magnetic sheet is infinite.

  The magnetic sheet according to this embodiment can be produced by a method including a step of mixing magnetic powder and a binder resin, a step of forming a sheet-like mixture, and a step of drying the sheet. In this case, the same kind and amount of magnetic powder and binder resin as exemplified above may be used.

  Specifically, the magnetic sheet is obtained by a method comprising the steps of (i) producing a slurry by dispersing magnetic powder in a binder resin and a solvent; and (ii) forming the slurry into a sheet and drying the sheet. Can be made.

  In one embodiment, a method for producing a magnetic sheet includes (1) a step of producing a binder resin by mixing a polyurethane resin, an isocyanate curing agent, and an epoxy resin; (2) a binder resin, a magnetic powder, and an organic solvent. And (3) forming the slurry into a sheet and drying the sheet. The magnetic sheet, based on the total weight of the magnetic sheet, is 6% to 12% polyurethane resin, 0.5% to 2% isocyanate curing agent, and 0.3% to 0.3% by weight as a binder resin. Contains 1.5 wt% epoxy resin.

  As a concrete example, first, in addition to polyurethane resin, isocyanate curing agent, and epoxy resin, magnetic powder is added to a solvent and dispersed using a disperser (planetary mixer, homomixer, no bead mill, etc.). A slurry having a viscosity of about 100 cPs to about 10,000 cPs. Then, a slurry is apply | coated on a carrier film with a comma coater, and it forms as a dry magnetic sheet. A dry magnetic sheet can be made into a polymer magnetic sheet (PMS) by controlling the speed and temperature according to the desired thickness, removing the solvent using a dryer, and winding up the molded sheet.

  Referring to FIG. 3, when the production process of the dry magnetic sheet 101 is performed by a roll-to-roll process, a slurry containing magnetic powder and a binder resin is applied onto the carrier film 400 by the coater 500 and then dried. Thus, the dry magnetic sheet 101 can be produced. In this case, the dry magnetic sheet 101 may include an uncured or semi-cured binder resin 121.

  That is, the dry magnetic sheet produced in this way may be a magnetic sheet in which the curing of the binder resin is not completed.

  Further, the magnetic sheet may be cured by hot pressing after drying.

  That is, the method for producing the magnetic sheet includes a step of curing the binder resin in the magnetic sheet by hot pressing the magnetic sheet at a pressure of 1 MPa to 100 MPa and a temperature of 100 ° C. to 300 ° C. after the step (3). Further, it may be included.

  As a result, the obtained magnetic sheet can be a magnetic sheet in which the binder resin is completely cured.

  The conductive magnetic composite sheet according to one embodiment includes a conductive foil provided on at least one side of the magnetic sheet and the magnetic sheet.

  2A and 2B show cross-sectional views of the conductive magnetic composite sheet according to one embodiment. As shown in FIG. 2A, the conductive magnetic composite sheet according to one embodiment includes a magnetic sheet 100, a first conductive foil 210, and a second conductive foil 220. As shown in FIG. 2B, the conductive magnetic composite sheet according to an embodiment may further include a first primer layer 310 and a second primer layer 320.

  In a preferred embodiment, the conductive magnetic composite sheet includes a magnetic sheet including magnetic powder and a binder resin; and a first conductive foil directly bonded to one side of the magnetic sheet. The conductive magnetic composite sheet may further include a second conductive foil joined directly to the other side of the magnetic sheet.

  In another preferred embodiment, the conductive magnetic composite sheet comprises: a magnetic sheet comprising magnetic powder and a binder resin; a first conductive foil disposed on one side of the magnetic sheet; and a magnetic sheet and the first conductive foil. A first primer layer disposed between and joining them together. The conductive magnetic composite sheet may further include a second conductive foil disposed on the other side of the magnetic sheet; and a second primer layer disposed between the magnetic sheet and the second conductive foil and joining them together. .

  That is, the conductive magnetic composite sheet is a composite sheet in which a conductive foil and a magnetic sheet are laminated (by a primer layer). For example, the conductive magnetic composite sheet may be a magnetic composite sheet in which copper is laminated.

  The magnetic sheet 100 included in the conductive magnetic composite sheet may have substantially the same composition and characteristics as the magnetic sheet of the above-described embodiment, and may be manufactured by substantially the same method.

  The magnetic sheet 100 may have a magnetic permeability of 100 to 300 at an AC frequency of 3 MHz, a magnetic permeability of 80 to 270 at an AC frequency of 6.78 MHz, and a magnetic permeability of 60 to 250 at an AC frequency of 13.56 MHz.

  According to a specific example, the magnetic sheet comprises 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of polyurethane resin as a binder resin, 0.5% by weight. % To 2% by weight isocyanate curing agent and 0.3% to 1.5% by weight epoxy resin. In this case, the magnetic powder has the composition of Formula 1, the polyurethane resin includes repeating units represented by Formula 2a and Formula 2b, the isocyanate curing agent is an alicyclic diisocyanate, and an epoxy resin. May be a bisphenol A type epoxy resin, a cresol novolac type epoxy resin or a tetrakis (glycidyloxyphenyl) ethane type epoxy resin.

  The conductive foil is disposed on at least one side of the magnetic sheet. That is, the conductive foil is disposed on one side and / or the other side of the magnetic sheet.

  The conductive foil can include a conductive material. For example, the conductive foil can include a conductive metal. That is, the conductive foil can be a metal layer. For example, the conductive foil may include at least one metal selected from the group consisting of copper, nickel, gold, silver, zinc, and tin. Specifically, the conductive foil can be a metal foil. For example, the conductive foil may be a copper foil.

  The thickness of the conductive foil can range from about 6 μm to about 200 μm, such as from about 10 μm to about 150 μm, from about 10 μm to about 100 μm, or from about 20 μm to about 50 μm.

  According to a preferred embodiment, as shown in FIG. 2A, the first conductive foil 210 and the second conductive foil 220 can be directly bonded to the magnetic sheet 100 without a separate adhesive layer. Therefore, the conductive foil can be in direct contact with the surface of the magnetic sheet. In this case, the conductive foil can be directly bonded to the binder resin of the magnetic sheet. Specifically, the conductive foil can be directly bonded to the thermosetting resin constituting the binder resin.

  An adhesive layer may be disposed between the magnetic sheet and the conductive foil. That is, the conductive magnetic composite sheet can further include an adhesive layer disposed between the magnetic sheet and the conductive foil. In this case, the adhesive layer can be in direct contact with the magnetic sheet and the conductive foil.

  Therefore, the adhesive layer can adhere the conductive foil to the magnetic sheet. The thickness of the adhesive layer can range from about 0.1 μm to about 20 μm. Specifically, the thickness of the adhesive layer can range from about 0.1 μm to about 10 μm, from about 1 μm to about 7 μm, or from about 1 μm to about 5 μm.

  The adhesive layer may include a thermosetting resin or a high heat resistant thermoplastic resin. Specifically, the adhesive layer can include an epoxy resin. The adhesive layer can bond the magnetic sheet to the conductive foil by thermosetting. Thereby, an adhesive layer can have high heat resistance and high adhesiveness.

  For example, the adhesive layer may have high chemical resistance by including a thermosetting resin. Accordingly, the adhesive layer can serve to protect the magnetic sheet. That is, when the conductive foil is etched using an etchant (or etchant), the adhesive layer can protect the magnetic sheet from the etchant.

  Therefore, since the conductive foil can be directly bonded to the magnetic sheet or can be bonded to the magnetic sheet via the adhesive layer, the conductive foil can be bonded with high adhesive strength. Specifically, since the thermosetting resin or the adhesive layer constituting the magnetic sheet is cured and the conductive foil is bonded, the bonding strength between the magnetic sheet and the conductive foil cannot be reduced even after a high temperature heat treatment step. .

  According to another preferred embodiment, as shown in FIG. 2B, the first primer layer 310 and the second primer layer 320 are provided between the magnetic sheet 100 and the first conductive foil 210 and between the magnetic sheet 100 and the second conductive foil. 220 between the two. That is, the conductive magnetic composite sheet includes the first primer layer 310 and the second primer layer 320 disposed between the magnetic sheet 100 and the first conductive foil 210 and between the magnetic sheet 100 and the second conductive foil 220, respectively. Is further included. In this case, the primer layer is in direct contact with the magnetic sheet 100 and the first conductive foil 210 and the second conductive 220.

  Thus, the primer layer can bond the conductive foil to the magnetic sheet. The thickness of the primer layer can range from about 0.01 μm to about 20 μm. Specifically, the primer layer thickness can range from about 0.01 μm to about 10 μm, from about 0.01 μm to about 7 μm, from about 0.01 μm to about 5 μm, or from about 0.01 μm to about 3 μm.

  As a specific example, the first primer layer (and the second primer layer) may have a thickness of 0.01 μm to 1 μm.

  The primer layer can contain a thermosetting resin or a high heat-resistant thermoplastic resin, and specifically can contain an epoxy resin.

  As a specific example, the first primer layer (and the second primer layer) includes a thermosetting resin, and the thermosetting resin of the first primer layer (and the second primer layer) applies heat and pressure to the laminate. Can be cured.

  Examples of epoxy resins include bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins and tetrabromobisphenol A type epoxy resins; spiro ring type epoxy resins; naphthalene type epoxy resins Biphenyl type epoxy resin; terpene type epoxy resin; glycidyl ether type epoxy resin such as tris (glycidyloxyphenyl) methane and tetrakis (glycidyloxyphenyl) ethane; glycidylamine type epoxy resin such as tetraglycidyldiaminodiphenylmethane; cresol novolac type epoxy Resin, phenol novolac type epoxy resin, α-naphthol novolak type epoxy resin, brominated phenol novolak type epoxy resin, etc. Novolak type epoxy resins. These epoxy resins can be used singly or in combination of two or more.

  Among these resins, in consideration of adhesiveness and heat resistance, the first primer layer (and the second primer layer) includes a bisphenol A type epoxy resin, a cresol novolac type epoxy resin, or tetrakis (glycidyloxyphenyl) ethane. Type epoxy resin may be used.

  The epoxy-based resin can have an epoxy equivalent weight of about 80 g / eq to about 1000 g / eq, or about 100 g / eq to about 300 g / eq. In addition, the epoxy resin may have a number average molecular weight of about 10,000 g / mol to 50000 g / mol.

  As a specific example, the first primer layer (and the second primer layer) has a thickness of 0.01 μm to 1 μm, and is a bisphenol A type epoxy resin, a cresol novolak type epoxy resin, or a tetrakis (glycidyloxyphenyl) ethane type epoxy. Resin may be included.

  The primer layer can bond the magnetic sheet to the conductive foil by thermosetting. Therefore, the primer layer can have high heat resistance and high bonding strength.

  Moreover, a primer layer can become a thing with high chemical resistance by including a thermosetting resin. Accordingly, the primer layer can serve to protect the magnetic sheet. That is, when the conductive foil is etched with an etching solution, the primer layer can protect the magnetic sheet from the etching solution.

  Since the conductive foil is bonded by curing the thermosetting resin that constitutes the magnetic sheet or primer layer, the conductive foil is attached to a high-temperature heat treatment process such as a reflow or soldering process that is performed for application to a product. Even so, the bonding strength between the magnetic sheet and the conductive foil cannot be reduced.

  Preferably, the conductive magnetic composite sheet has a peel strength between the conductive foil and the magnetic sheet of 0.6 kgf / cm or more, for example, 0.6 kgf / cm to 20 kgf / cm, 0.6 kgf / cm to 10 kgf / cm, 0.6 kgf / cm to 5 kgf / cm, or 0.6 kgf / cm to 3 kgf / cm.

  Further, when the conductive magnetic body is heat-treated twice (the heat treatment is composed of heating from 30 ° C. to 240 ° C. at a constant rate for 200 seconds and then cooling from 240 ° C. to 130 ° C. at a constant rate for 100 seconds) The conductive magnetic composite sheet has a peel strength between the conductive foil and the magnetic sheet of 0.6 kgf / cm or more, for example, 0.6 kgf / cm to 20 kgf / cm, 0.6 kgf / cm to 10 kgf / cm, 0.6 kgf. / Cm to 5 kgf / cm, or 0.6 kgf / cm to 3 kgf / cm.

  Furthermore, when the heat treatment is repeated twice under the above conditions, the rate of change (decrease rate) in the peel strength between the conductive foil and the magnetic sheet may be 20% or less, 15% or less, or 10% or less.

  Therefore, with respect to the conductive magnetic composite sheet according to the present embodiment, even when the conductive magnetic composite sheet is subjected to a soldering process such as a reflow process, there is almost no change in physical properties such as magnetic permeability and thickness, and the magnetic sheet and Problems such as delamination with the conductive foil do not occur.

  The method for producing a conductive magnetic composite sheet according to one embodiment includes a step of producing a magnetic sheet containing magnetic powder and a binder resin; and a step of stacking the magnetic sheet and the first conductive foil; and an obtained stack ( Or a step of applying heat and pressure to the stack to join the magnetic sheet and the first conductive foil.

  In the present embodiment, the binder resin may be a thermosetting resin, and the binder resin can join the magnetic sheet to the first conductive foil while being cured in the step of applying heat and pressure to the stack.

  In the present embodiment, the first conductive foil has the first primer layer on one side thereof, and the first side of the magnetic sheet is in contact with the first primer layer of the first conductive foil. Conductive foils can be stacked.

  A method for producing a conductive magnetic composite sheet according to another embodiment includes a step of producing a magnetic sheet containing magnetic powder and a binder resin; a step of stacking the first conductive foil, the magnetic sheet, and the second conductive foil; It includes a step of integrally joining the first conductive foil, the magnetic sheet and the second conductive foil by applying heat and pressure to the stack.

  In the present embodiment, the binder resin may be a thermosetting resin, and the binder resin joins the first conductive foil, the magnetic sheet, and the second conductive foil while being cured in the process of applying heat and pressure to the stack. To do.

  Further, in the present embodiment, the first conductive foil has a first primer layer on one side thereof, the second conductive foil has a second primer layer on one side thereof, and one side of the magnetic sheet has a first primer layer. The magnetic sheet and the first conductive foil are stacked so as to be in contact with the first primer layer of one conductive foil, and the magnetic sheet and the second conductive foil are so that the other side of the magnetic sheet is in contact with the second primer layer of the second conductive foil. Are stacked.

In a preferred embodiment, the method for producing a conductive magnetic composite sheet includes a step of producing a magnetic sheet containing magnetic powder and a thermosetting binder resin; a step of stacking the magnetic sheet and the first conductive foil; and the resulting product. It includes a step of joining the magnetic sheet to the first conductive foil by applying heat and pressure to the heavy body to cure the binder resin.

  In another preferred embodiment, a method for producing a conductive magnetic composite sheet includes a step of producing a magnetic sheet containing magnetic powder and a binder resin; a step of stacking a first conductive foil, a magnetic sheet and a second conductive foil; The method includes a step of integrally joining the first conductive foil, the magnetic sheet, and the second conductive foil by applying heat and pressure to the stacked body to cure the binder resin.

  In another preferred embodiment, the method for producing a conductive magnetic composite sheet includes a step of producing a magnetic sheet containing magnetic powder and a binder resin; a step of forming a first primer layer on one side of the first conductive foil; Stacking the magnetic sheet and the first conductive foil such that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil; and applying heat and pressure to the resulting stack to make the magnetic sheet the first conductive A step of bonding to the foil.

  In another preferred embodiment, the method for producing a conductive magnetic composite sheet includes a step of producing a magnetic sheet containing magnetic powder and a binder resin; a step of forming a first primer layer on one side of the first conductive foil; Forming a second primer layer on one side of the second conductive foil; stacking the magnetic sheet and the first conductive foil such that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil; Stacking the magnetic sheet and the second conductive foil so that the other side of the sheet is in contact with the second primer layer of the second conductive foil; and applying heat and pressure to the resulting stack, the first conductive foil, the magnetic A step of integrally joining the sheet and the second conductive foil.

  The magnetic sheet used in the method of the present embodiment can have substantially the same composition and characteristics as the magnetic sheet of the above embodiment, and can be manufactured by substantially the same method.

  Specifically, the magnetic sheet comprises 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, 6% to 12% by weight of polyurethane resin as the binder resin, 0.5% to 2%. It may contain wt% isocyanate based curing agent and 0.3 wt% to 1.5 wt% epoxy based resin. As a specific example, the polyurethane resin includes repeating units represented by formulas 2a and 2b, the isocyanate curing agent is an alicyclic diisocyanate, and the epoxy resin is a bisphenol A type epoxy resin, a cresol novolac type epoxy resin, or a tetrakis It may be a (glycidyloxyphenyl) ethane type epoxy resin.

  The magnetic sheet may be a non-sintered sheet having a thickness of 10 μm to 3000 μm and having flexibility.

  Further, the magnetic sheet has a magnetic permeability of 100 to 300 with an alternating current with a frequency of 3 MHz, a magnetic permeability of 80 to 270 with an alternating current with a frequency of 6.78 MHz, and an alternating current with a frequency of 13.56 MHz with a magnetic permeability of 60 to 250. Can have magnetic permeability.

  Thereafter, conductive foil is stacked on one side or both sides of the dry magnetic sheet. The conductive foil can be a metal foil, for example, a copper foil.

  According to the preferred embodiment, as shown in FIG. 4, the first conductive foil 210 and the second conductive foil 220 may be bonded to the magnetic sheet 100 at the same time as the curing of the binder resin is completed. Since the first conductive foil 210 and the second conductive foil 220 are bonded to the magnetic sheet 100 by thermosetting, the bonding strength between the magnetic sheet and the conductive foil can be excellent. In particular, since the magnetic sheet and the conductive foil are integrally bonded while the binder resin is cured simultaneously with the press 700, the bonding strength can be improved. Thus, the conductive foil can be easily joined to the magnetic sheet without a separate adhesive layer.

  In another preferred embodiment, the conductive foil has a primer layer formed on one side thereof, and the dry magnetic sheet and the conductive foil are stacked such that one side of the dry magnetic sheet is in contact with the primer layer of the conductive foil. .

  The primer layer can include a thermosetting resin.

  An example of the thermosetting resin used as the first primer layer (and the second primer layer) may be an epoxy resin.

  For example, the first primer layer (and the second primer layer) can include a bisphenol A type epoxy resin, a cresol novolac type epoxy resin, or a tetrakis (glycidyloxyphenyl) ethane type epoxy resin.

  The thickness of the primer layer can range from about 0.01 μm to about 10 μm, from about 0.01 μm to about 5 μm, or from about 0.01 μm to about 1 μm. Further, the primer layer thickness can range from about 0.1 μm to 10 μm, or from about 1 μm to 5 μm.

  Specifically, the first primer layer (and the second primer layer) includes a thermosetting resin, and the thermosetting resin of the first primer layer (and the second primer layer) applies heat and pressure to the stack. It can be cured in the process. The binder resin includes a thermosetting resin, and the thermosetting resin in the binder resin can be cured in a step of applying heat and pressure to the stack.

  As a result, the first conductive foil and the second conductive foil can be joined to the magnetic sheet at the same time as the curing of the magnetic sheet and the primer layer is completed. Since the first conductive foil and the second conductive foil are joined to the magnetic sheet by the heat-cured first primer layer and the second primer layer, the adhesive strength between the magnetic sheet and the conductive foil can be made excellent. In particular, the adhesive strength can be improved because the magnetic sheet and the conductive foil are joined while the primer layer is cured simultaneously with pressing.

  The step of applying heat and pressure may be performed at a pressure of 1 MPa to 100 MPa and a temperature of 100 ° C to 300 ° C. Moreover, the process of applying heat and pressure can be performed at a pressure of 5 MPa to 30 MPa and a temperature of 150 ° C. to 200 ° C. Further, the step of applying heat and pressure to the magnetic sheet and the conductive foil can be performed for about 0.1 hours to about 5 hours.

  The step of applying heat and pressure can be performed by a roll-to-roll process or a batch process.

  As shown in FIG. 5, applying heat and pressure can be performed by a roll-to-roll process. In the roll-to-roll process, the first conductive foil 210 and the second conductive foil 220 are laminated on one side or both sides of the dry magnetic sheet 101 where the curing of the binder resin is not completed and passed through the roll 600. . In this case, since the roll itself is heated, the roll can apply both heat and pressure to the stack. That is, the magnetic sheet and the conductive foil are continuously laminated with a roll. As a result, the first conductive foil 210 and the second conductive foil 220 can be bonded to the magnetic sheet 100 at the same time as the magnetic sheet 100 in which the binder resin has been cured is formed.

  In a roll-to-roll process, the temperature of the roll can range from about 100 ° C to about 300 ° C. Also, the pressure of the roll can range from about 1 MPa to about 100 MPa. In addition, about 1-20 pairs of rolls can be used in a roll-to-roll process. Furthermore, the travel speed of the laminate may range from about 0.1 m / min to 10 m / min.

  According to a specific example, the stacking step and the step of applying heat and pressure can be performed by a roll-to-roll process, wherein the roll-to-roll process is performed at a roll temperature of 150 ° C. to 200 ° C., It can be carried out at a speed of 1 m / min to 5 m / min using a roll pressure of 5 MPa to 30 MPa and 2 to 10 pairs of rolls.

  As shown in FIG. 6, the step of applying heat and pressure can be performed by a batch process. Specifically, the dry magnetic sheet and the conductive foil are stacked, and the formed stack is stacked again in multiple stages. Thereafter, heat treatment is performed in a state where pressure is applied to the magnetic sheets and conductive foil stacked in multiple stages. As a result, the binder 10 and the binder resin of the magnetic sheet are cured, and the stacked body 10 in which the first conductive foil 210 and the second conductive foil 220 are bonded to the magnetic sheet 100 by the cured binder resin can be obtained.

  In the batch process described above, the heat treatment temperature can range from about 100 ° C to about 300 ° C. Moreover, the pressure applied to the stacked body stacked in multiple stages may be in the range of about 1 MPa to about 100 MPa. Further, the length of time that heat and pressure are applied can range from about 0.1 hours to about 5 hours.

  In one embodiment, as shown in FIG. 7, an uncured or semi-cured first primer layer 311 is formed on one side of the first conductive foil 210, and an uncured or semi-cured layer is formed on one side of the second conductive foil 220. A semi-cured second primer layer 321 is formed. Thereafter, the first conductive foil 210 and the second conductive foil 220 are stacked so that the first primer layer 311 and the second primer layer 321 can come into contact with one side and the other side of the dry magnetic sheet 101, respectively.

  Thereafter, as shown in FIG. 8, the dry magnetic sheet, the primer layer, and the conductive foil are laminated by heat and pressure 700. Thereby, a dry-type magnetic sheet and conductive foil can be laminated | stacked through a primer layer. In this case, the lamination can be performed under heating and pressure conditions, and specifically, can be performed by the above-described roll-to-roll process or batch process under the temperature and pressure conditions described above. .

  As a result, it is possible to form the magnetic sheet 100 in which the binder resin is completely cured by heat in the lamination process. Further, since the primer layer is cured at the time of lamination, the magnetic sheet and the conductive foil can be integrally joined by the cured primer layer. That is, the cured primer layer can function as an adhesive layer configured to join the magnetic sheet to the conductive foil. Thus, the conductive magnetic composite sheet in which the magnetic sheet 100 and the first conductive foil 210 and the magnetic sheet 100 and the second conductive foil 220 are joined via the cured first primer layer 310 and second primer layer 320. Can be obtained.

  According to an example, since the first primer layer 310 and the second primer layer 320 are formed by curing a thermosetting resin, the first primer layer 310 and the second primer layer 320 may have chemical resistance. Accordingly, when the conductive foil is etched using the etchant, the first primer layer 310 and the second primer layer 320 can serve to protect the magnetic powder contained in the magnetic sheet.

  An antenna device according to an embodiment includes a magnetic sheet and an antenna pattern disposed on at least one side of the magnetic sheet.

  The magnetic sheet included in the antenna device can have substantially the same composition and characteristics as the magnetic sheet of the above-described embodiment, and can be manufactured by substantially the same method.

  Therefore, the magnetic sheet has a magnetic permeability of 100 to 300 at an alternating current of 3 MHz, a magnetic permeability of 80 to 270 at an alternating current of 6.78 MHz, and a magnetic permeability of 60 to 250 at an alternating current of 13.56 MHz. Can have.

  The magnetic sheet can include a binder resin and magnetic powder dispersed in the binder resin.

  Further, the magnetic sheet may be a non-sintered sheet having a thickness of 10 μm to 3000 μm and having flexibility.

  According to a specific example, the magnetic sheet comprises 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of polyurethane resin as a binder resin, 0.5% to It may contain 2% by weight isocyanate curing agent and 0.3% to 1.5% by weight epoxy resin. In this case, the magnetic powder has the composition of Formula 1, the polyurethane resin includes repeating units represented by Formula 2a and Formula 2b, the isocyanate curing agent is an alicyclic diisocyanate, and an epoxy resin. May be a bisphenol A type epoxy resin, a cresol novolac type epoxy resin or a tetrakis (glycidyloxyphenyl) ethane type epoxy resin.

  The antenna pattern is arranged on one side or both sides of the magnetic sheet.

  The antenna pattern can include a conductive material. For example, the antenna pattern can include a conductive metal. Specifically, the antenna pattern may include at least one metal selected from the group consisting of copper, nickel, gold, silver, zinc and tin.

  The pattern shape of the antenna pattern according to the embodiment is not particularly limited. The pattern can be formed to achieve various functions including, for example, near field communication (NFC) antennas, wireless power charging (WPC) antennas, and magnetic protection transmission (MST) antenna functions. The pattern shape can be variously changed as required. The antenna pattern can also be a printed circuit pattern. The antenna pattern may have a coil shape or a spiral shape.

  The antenna pattern may be directly bonded to the magnetic sheet, so that the antenna pattern can be in direct contact with one or both sides of the magnetic sheet. The antenna pattern may be firmly bonded to the magnetic sheet by the primer layer.

  According to a preferred embodiment, the antenna device includes a magnetic sheet comprising magnetic powder and a binder resin; and a first antenna pattern bonded directly to one side of the magnetic sheet.

  According to another preferred embodiment, the antenna device comprises: a magnetic sheet comprising magnetic powder and a binder resin; a first antenna pattern directly bonded to one side of the magnetic sheet; and the other side of the magnetic sheet. It includes a second antenna pattern joined directly.

  According to another preferred embodiment, the antenna device comprises a magnetic sheet comprising magnetic powder and a binder resin; a first antenna pattern disposed on one side of the magnetic sheet; and a magnetic sheet and a first antenna pattern. A first primer layer disposed between the magnetic sheet and the first antenna pattern.

  According to another preferred embodiment, the antenna device comprises a magnetic sheet comprising magnetic powder and a binder resin; a first antenna pattern disposed on one side of the magnetic sheet; and disposed on the other side of the magnetic sheet. A second primer pattern; a first primer layer disposed between the magnetic sheet and the first antenna pattern to integrally bond the magnetic sheet and the first antenna pattern; and the magnetic sheet and the second A second primer layer is disposed between the magnetic sheet and the second antenna pattern to integrally bond the antenna pattern.

  The antenna device may further include a via that penetrates the magnetic sheet.

  That is, the antenna device may include a magnetic sheet; an antenna pattern disposed on one side or both sides of the magnetic sheet; and at least one via connected through the magnetic sheet to the antenna pattern.

  The via contacts with both antenna patterns arranged on both sides of the magnetic sheet to electrically connect the antenna patterns. The via can include a conductive material. For example, the via can include at least one metal selected from the group consisting of copper, nickel, gold, silver, zinc, and tin.

  Further, the magnetic sheet may include a via hole penetrating vertically. The via hole may have a diameter of 100 μm to 300 μm or 120 μm to 170 μm, for example.

  In this case, the inner wall of the first via hole is plated, the first via hole is filled with a conductive material, or a solder or a conductive bar is inserted into the first via hole, whereby the first via hole constitutes the first via. obtain. For example, the magnetic sheet includes a first via hole penetrating vertically, and in this case, the inner wall of the first via hole can be plated to form the first via.

  The antenna device according to the present embodiment may have various forms including the shape of the antenna pattern, the connection between the via and the terminal, or additional wiring.

  According to one embodiment, the antenna pattern includes a first antenna pattern disposed on one side of the magnetic sheet, the antenna device further includes a wiring pattern disposed on the other side of the magnetic sheet, and The via includes a first via penetrating the magnetic sheet and connected to one end of the first antenna pattern and one end of the wiring pattern.

  According to another embodiment, the antenna patterns are arranged in parallel to be separated from each other on the other side of the magnetic sheet; and a plurality of first conductive line patterns arranged in parallel to be spaced apart from each other on one side of the magnetic sheet. And a plurality of second conductive line patterns. The extending directions of the first conductive line pattern and the second conductive line pattern are the same, and the via is formed of a plurality of vias that penetrate the magnetic sheet and connect the first conductive line pattern and the second conductive line pattern. .

  Hereinafter, specific embodiments of the antenna device will be described by way of example.

  According to one particular embodiment, referring to FIG. 9, the antenna device is disposed on the magnetic sheet 100; a first antenna pattern 230 disposed on one side of the magnetic sheet; on the other side of the magnetic sheet. A wiring pattern 240 for integrally bonding; and a first via 251 penetrating the magnetic sheet 100. In this case, the first via 251 is connected to one end of the first antenna pattern 230 and one end of the wiring pattern 240.

  The antenna device according to a specific embodiment further includes a first terminal pattern and a second terminal pattern on one side or the other side of the magnetic sheet 100, and includes a second via 252 that penetrates the magnetic sheet 100. , And various antenna devices can be designed according to the location and connection configuration of these components.

  FIG. 10A to FIG. 10C are plan views of antenna devices according to various embodiments (the portion indicated by a black pattern is a front pattern, the hatched portion is a rear pattern, and is indicated by a circle) Part is a via).

  Hereinafter, a more specific example of an antenna device according to a specific embodiment will be described with reference to the drawings.

  First, referring to FIG. 10A, an antenna device according to a specific embodiment includes a first terminal pattern 271 disposed on one side of the magnetic sheet 100; and a second via 252 penetrating the magnetic sheet 100. In addition. In this case, the second via 252 can be connected to the other end of the first terminal pattern 271 and the other end of the wiring pattern 240. In this case, the antenna device may further include a second terminal pattern 272 disposed on one side of the magnetic sheet 100. In this case, the other end of the first antenna pattern 230 may be connected to the second terminal pattern 272. In this case, the first terminal pattern 271 and the second terminal pattern 272 may be disposed adjacent to each other.

  Further, referring to FIG. 10B, the antenna device according to a specific embodiment may further include a first terminal pattern 271 disposed on the other side of the magnetic sheet 100, and the first terminal pattern 271 may be The wiring pattern 240 can be connected to the other end. In this case, the antenna device may further include a second terminal pattern 272 disposed on the other side of the magnetic sheet 100; and a second via 252 penetrating the magnetic sheet 100. The second via 252 includes The other end of the two-terminal pattern 272 and the other end of the first antenna pattern 230 may be connected. In this case, the first terminal pattern 271 and the second terminal pattern 272 may be disposed adjacent to each other.

  Further, referring to FIG. 10C, the antenna device according to a specific embodiment may further include a first terminal pattern 271 disposed on the other side of the magnetic sheet 100, and the first terminal pattern 271 may be The wiring pattern 240 can be connected to the other end. In this case, in another embodiment, the antenna device further includes a second terminal pattern 272 disposed on one side of the magnetic sheet 100, and the second terminal pattern 272 is connected to the other end of the first antenna pattern 230. Can be connected.

  In an antenna device according to a specific embodiment, the first antenna pattern and the wiring pattern are formed of a conductive material, the first antenna pattern is bonded to one side of the magnetic sheet, and the wiring pattern is a magnetic sheet. Can be joined to the other side.

  Referring to FIG. 13, an antenna device according to a specific embodiment may generate an electromagnetic signal 50 by a current flowing through a first antenna pattern. The electromagnetic signal 50 enables transmission (or transmission) and reception (reception) of the signal between the antenna device 20 and the external terminal 40.

  In the antenna device according to a specific embodiment, the first antenna pattern and the wiring pattern are respectively arranged on different sides of the magnetic sheet and connected through vias penetrating the magnetic sheet, thereby suppressing a short circuit. In addition, no additional processing such as wiring taping is required, thereby improving processing efficiency. Moreover, since the antenna device according to the present embodiment can prevent an increase in thickness due to the insulating wiring cloth, the thin film characteristics of the antenna device can be further improved.

  According to another specific embodiment, the antenna device is a magnetic sheet; a plurality of first conductive line patterns arranged in parallel to be spaced apart from each other on one side of the magnetic sheet; spaced from each other on the other side of the magnetic sheet A plurality of second conductive line patterns arranged in parallel to each other; and a plurality of vias arranged to penetrate the magnetic sheet. In this case, the extending directions of the first conductive line pattern and the second conductive line pattern are the same, and the via is connected to the first conductive line pattern and the second conductive line pattern.

  Specifically, since the vias are alternately connected to the first conductive line pattern and the second conductive line pattern that are arranged in parallel to be separated from each other, one end and the other end of any first conductive line pattern are adjacent to each other. Are connected to two second conductive line patterns, respectively, and one end and the other end of any second conductive line pattern can be connected to two adjacent first conductive line patterns, respectively.

  When the magnetic sheet is divided into the core region and the peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are arranged in the peripheral region, and the first conductive line pattern and the second conductive line pattern And the vias are arranged in the surrounding region so as to cross the core region and to connect the end of the first conductive line pattern and the end of the second conductive line pattern.

  In this case, the first conductive line pattern, the second conductive line pattern, and the via may be connected to each other to form a coil that surrounds the core region.

  As shown in FIGS. 11A and 11B, an antenna device according to another specific embodiment includes a magnetic sheet 100, a plurality of first conductive line patterns 231, a plurality of second conductive line patterns 232, and a plurality of vias. 250.

  The magnetic sheet can be divided into a core region CR and a surrounding region OR adjacent to the core region.

  The core region is disposed at the center of the magnetic sheet. The core region may have a shape that extends in one direction.

  The surrounding area is arranged around the core area. The surrounding region may have a shape that extends in the same direction as the core region. The surrounding area may be arranged on both sides of the core area.

  The first conductive line pattern is disposed on the magnetic sheet. Specifically, the first conductive line pattern is bonded to one side of the magnetic sheet.

  The first conductive line pattern may extend in a direction crossing the direction in which the core region extends. Specifically, the first conductive line pattern may extend across the core region. The first conductive line pattern may extend from a peripheral region disposed on one side of the core region to a peripheral region disposed on the other side of the core region.

  The plurality of first conductive line patterns may extend in a line. The first conductive line patterns may be spaced apart from each other.

  The second conductive line pattern is disposed on the other side of the magnetic sheet. Specifically, the second conductive line pattern is bonded to the other side of the magnetic sheet.

  The second conductive line pattern may extend in a direction crossing the direction in which the core region extends. Specifically, the second conductive line pattern may extend across the core region. The second conductive line pattern may extend from a peripheral region disposed on one side of the core region to a peripheral region disposed on the other side of the core region.

  The plurality of second conductive line patterns may extend in a line. The second conductive line patterns may be spaced apart from each other.

  The via penetrates the magnetic sheet. The via is connected to the first conductive line pattern and the second conductive line pattern. Specifically, the via may be connected to one end of the first conductive line pattern and one end of the second conductive line pattern.

  The vias may be alternately connected to the first conductive line pattern and the second conductive line pattern. For example, the first conductive line pattern, the via, the second conductive line pattern, the via, the first conductive line pattern, the via, the second conductive line pattern, and the via may be connected in succession.

  The first conductive line pattern, the second conductive line pattern, and the via may be connected to each other so as to form a coil that spirally surrounds the core region.

  Therefore, when an alternating current flows through the first conductive line pattern, the second conductive line pattern, and the via, an electromagnetic signal can be formed so as to pass through both ends of the core region.

  As a preferred example, the magnetic sheet is formed thin, and an electromagnetic signal can be formed with a high magnetic flux density through both ends of the core region. Therefore, the antenna device according to the present embodiment can improve reception sensitivity, and can easily transmit and receive electromagnetic signals even in a narrow gap.

  An antenna device manufacturing method according to an embodiment of the present invention includes a step of integrally joining a magnetic sheet and a conductive foil by applying heat and pressure to the magnetic sheet and the conductive foil; and etching the conductive foil to form an antenna. -The process of forming a pattern is included.

  According to a preferred embodiment, a method for manufacturing an antenna device includes a step of manufacturing a magnetic sheet containing magnetic powder and a binder resin; a step of stacking the magnetic sheet and the first conductive foil; Applying pressure to bond the magnetic sheet to the first conductive foil; and etching the first conductive foil to form a first antenna pattern.

  According to another preferred embodiment, a method for manufacturing an antenna device includes a step of manufacturing a magnetic sheet containing magnetic powder and a binder resin; a step of stacking a first conductive foil, a magnetic sheet, and a second conductive foil; Applying heat and pressure to the stacked body to integrally bond the first conductive foil, the magnetic sheet and the second conductive foil; and etching the first conductive foil and the second conductive foil to form the first antenna pattern and Forming a second antenna pattern.

  According to another preferred embodiment, a method for manufacturing an antenna device includes a step of manufacturing a magnetic sheet containing magnetic powder and a binder resin; a step of forming a first primer layer on one side of the first conductive foil; A step of stacking the magnetic sheet and the first conductive foil so that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil; heat and pressure are applied to the obtained stack to apply the magnetic sheet to the first conductive foil And a step of etching the first conductive foil to form a first antenna pattern.

  According to another preferred embodiment, a method for manufacturing an antenna device includes a step of manufacturing a magnetic sheet containing magnetic powder and a binder resin; a step of forming a first primer layer on one side of the first conductive foil; Forming a second primer layer on one side of the second conductive foil; stacking the magnetic sheet and the first conductive foil such that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil; Stacking the magnetic sheet and the second conductive foil so that the other side of the sheet is in contact with the second primer layer of the second conductive foil; applying heat and pressure to the resulting stack, the first conductive foil and the magnetic sheet And integrally bonding the second conductive foil; and etching the first conductive foil and the second conductive foil to form a first antenna pattern and a second antenna pattern, respectively. No.

  The magnetic sheet used in the above method may have substantially the same composition and characteristics as the magnetic sheet according to the above-described embodiment.

  As a specific example, the magnetic sheet comprises 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of polyurethane resin as a binder resin, 0.5% to 2% by weight. % Isocyanate curing agent and 0.3 wt% to 1.5 wt% epoxy resin. In this case, the magnetic powder has the composition of Formula 1, the polyurethane resin includes repeating units represented by Formula 2a and Formula 2b, the isocyanate curing agent is an alicyclic diisocyanate, and an epoxy resin. May be a bisphenol A type epoxy resin, a cresol novolac type epoxy resin or a tetrakis (glycidyloxyphenyl) ethane type epoxy resin.

  The magnetic sheet can be manufactured under substantially the same conditions and method as the magnetic sheet manufacturing method according to the embodiment described above.

  Specifically, (a) a step of preparing a binder resin by mixing a polyurethane resin, an isocyanate curing agent and an epoxy resin; (b) preparing a slurry by mixing the binder resin, magnetic powder and an organic solvent. And (c) A magnetic sheet can be produced by a method including the steps of forming the slurry into a sheet and drying the sheet.

  A conductive magnetic composite sheet is produced by applying heat and pressure, and the specific process conditions and method are the same as those for producing the conductive magnetic composite sheet described above.

  In the etching step, a mask pattern is formed on the conductive foil using a photoresist, and the conductive foil is etched using a mask pattern that can be patterned. Etching can be performed using a typical etchant such as an acidic aqueous solution. In this case, since the magnetic sheet is protected by the primer layer, a decrease in thickness or magnetic permeability due to the etching solution can be reduced. Moreover, even if the etching solution penetrates the magnetic sheet, the decrease in thickness or magnetic permeability due to the etching solution can be reduced due to the excellent chemical resistance of the magnetic sheet.

  Preferably, the step of applying heat and pressure is performed at a pressure of 1 MPa to 100 MPa and a temperature of 100 ° C. to 300 ° C., and the etching can be performed using an acidic aqueous solution.

  The method for fabricating the antenna device may further include forming a via configured to penetrate the magnetic sheet (and primer layer) between the step of applying heat and pressure and the etching step.

  12A to 12C illustrate an example of a method for manufacturing an antenna device having a via.

  First, as shown in FIG. 12A, a plurality of via holes 260 are formed in a conductive magnetic composite sheet. The via hole 260 penetrates the magnetic sheet 100 and the first conductive foil 210 and the second conductive foil 220. The diameter of the via hole can be, for example, 100 μm to 300 μm or 120 μm to 170 μm.

  Thereafter, as shown in FIG. 12B, a plating layer may be formed on the inner surface of the via hole 260 to form the via 250. When forming a via by a plating method, a via formed in a large area can be formed at a time. That is, when the via is formed as a plating layer, the via can be easily and efficiently formed. Alternatively, the via can be formed by filling the via hole with conductive powder and then sintering the conductive powder. Furthermore, vias can be formed by inserting solder or conductive bars into the via holes.

  Thereafter, a mask pattern is formed by a process such as a photoresist process that covers the first conductive foil 210 and the second conductive foil 220, and the first conductive foil 210 is selectively etched by the mask pattern as shown in FIG. 12C. A first antenna pattern 230 is formed.

  In this case, the binder resin of the magnetic sheet is in close contact with the antenna pattern. That is, the binder resin of the magnetic sheet is bonded to the antenna pattern by a thermosetting process. Therefore, in the etching process, the etching solution does not penetrate between the magnetic sheet and the antenna pattern. As a result, the antenna pattern can be bonded to the magnetic sheet with improved adhesive strength. Therefore, by directly forming the conductive foil or antenna pattern on the magnetic sheet without using an insulating substrate such as polyimide, the thickness can be reduced and the manufacturing method can be simplified.

  In addition, when the primer layer is thermally cured to firmly bond the magnetic sheet and the conductive foil to each other, the first antenna pattern formed by etching can be bonded to the magnetic sheet with improved adhesive strength. Thereby, in the antenna device according to the present embodiment, the bonding strength between the magnetic sheet and the antenna pattern can be improved by the primer layer disposed between the magnetic sheet and the antenna pattern. The primer layer can protect the magnetic sheet from the external environment.

  Further, since the antenna device according to the present embodiment has excellent magnetic characteristics, the antenna device can be used for many applications such as NFC, WPC, and MST. Furthermore, since the polymer magnetic sheet is used, the flexibility of the antenna device according to the present embodiment can be improved, and the antenna device can be manufactured by a roll-to-roll process. Can be improved.

  In particular, in magnetic sheets, the binder resin can be hardened by heat and hold the magnetic powder more firmly, so there is almost no change in weight and thickness even when the environment changes. For example, etching is performed for patterning. Or a reflow or soldering process is performed for application of the magnetic sheet to the product.

  A portable terminal according to an embodiment includes a case and an antenna device disposed in the case. The case includes an electromagnetic wave transmission region and an electromagnetic wave non-transmission region. The antenna device includes: a magnetic sheet; a plurality of first conductive line patterns arranged in parallel to be spaced apart from each other on one side of the magnetic sheet; a plurality of second conductive lines arranged in parallel to be separated from each other on the other side of the magnetic sheet. A conductive line pattern; and a plurality of vias penetrating the magnetic sheet. The extending directions of the first conductive line pattern and the second conductive line pattern are the same, and the electromagnetic wave transmission region is arranged in parallel with the first conductive line pattern and the second conductive line pattern.

  Specifically, the magnetic sheet is divided into a core region and a peripheral region around the core region, and both ends of the first conductive line pattern and the second conductive line pattern are disposed in the peripheral region, while the first conductive line pattern and The second conductive line pattern crosses the core region, and the via is disposed in the surrounding region so as to connect the end portions of the first conductive line pattern and the second conductive line pattern.

  Furthermore, the first conductive line pattern, the second conductive line pattern and the via are connected to each other to form a coil surrounding the core region.

  The antenna device generates an electromagnetic signal in a direction orthogonal to the extending direction of the first conductive line pattern and the second conductive line pattern, and the electromagnetic signal travels outside the case through the electromagnetic wave transmission region.

  For example, the electromagnetic wave transmission region includes glass or plastic, and the electromagnetic wave non-transmission region includes metal.

  FIG. 14 illustrates a portion of a portable terminal in which an antenna device according to one embodiment is used. Referring to FIG. 14, the antenna device 20 is disposed in the case 30. The case 30 includes an electromagnetic wave transmission region 32 and an electromagnetic wave non-transmission region 31. The electromagnetic wave non-transmissive region may include a material that blocks electromagnetic waves, such as a metal. The electromagnetic wave transmission region can include a material that can easily transmit electromagnetic waves, such as glass or plastic. Even if the transmission (or transmission) area is narrowly formed, the antenna device according to the present embodiment can effectively transmit and receive the electromagnetic wave signal 50 through the external terminal 40.

  Conventional antenna devices are manufactured by forming an antenna pattern on an insulating substrate layer such as polyimide, and adding a magnetic sheet to the antenna pattern. Therefore, conductive line patterns are formed on both sides of the substrate layer, and through vias. Even if connected alternately, the electromagnetic signal is blocked by a magnetic sheet added on one side of the substrate layer. In contrast, in the antenna device according to the present embodiment, a magnetic sheet is used as a substrate layer to form conductive line patterns on both sides thereof, and conductive line patterns are alternately connected via vias to form a coil. Therefore, the permeability of electromagnetic signals is not hindered, and the communication sensitivity can be improved by the excellent magnetic properties of the magnetic sheet.

  Hereinafter, a more specific example will be illustrated and described.

The materials used in the examples below are as follows:
-Sendust powder: CIF-02A, Crystallite Technology Co., Ltd.-Polyurethane resin: UD 1357, Dainichi Seika Kogyo Co., Ltd. 189 g / eq), Epicoat ^TM 828, Japan Epoxy Resin Co., Ltd.

Example 1: Production process of magnetic sheet 1) Production of magnetic powder slurry As magnetic powder, 42.8 parts by weight of Sendust powder, 15.4 parts by weight of polyurethane resin dispersion (25% by weight of polyurethane resin, 75% by weight) % 2-butanone), 1.0 part by weight isocyanate-based curing agent dispersion (62% by weight isocyanate-based curing agent, 25% by weight n-butyl acetate, 13% by weight 2-butanone), 0.4 Parts by weight of an epoxy resin dispersion (70% by weight epoxy resin, 3% by weight n-butyl acetate, 15% by weight 2-butanone, 13% by weight toluene), and 40.5 parts by weight toluene. The magnetic powder slurry was prepared by mixing for 2 hours at a speed of about 40 rpm to about 50 rpm with a planetary mixer.

Step 2) Production of Magnetic Sheet The magnetic powder slurry was applied on a carrier film with a comma coater and dried at a temperature of about 110 ° C. to produce a dry magnetic sheet. The final magnetic sheet was obtained by compression curing the dry magnetic sheet using a hot press method at a temperature of about 170 ° C. and a pressure of about 9 MPa for about 30 minutes.

Example 2 Production of Magnetic Composite Sheet Laminated with Copper Foil An epoxy resin was applied to one side of a copper foil having a thickness of about 37 μm to form a primer layer having a thickness of about 4 μm. A copper foil was disposed on both sides of the magnetic sheet obtained in Example 1, and a stack was formed so that a primer layer was disposed between the magnetic sheet and the copper foil. Thereafter, the stack was compressed to cure the primer layer by a hot press method at a temperature of about 170 ° C. and a pressure of about 9 MPa for about 60 minutes, thereby producing a magnetic sheet laminated with copper foil.

Example 3 Production of Antenna Device A plurality of via holes having a diameter of about 0.15 mm were formed on the magnetic composite sheet obtained by laminating the copper foil obtained in Example 2 using a drill. Thereafter, a copper plating layer was formed in the via hole through a copper plating method. The plating layer functioned as a via that interconnects the top and bottom surfaces of the copper foil. Thereafter, mask patterns were formed on the top and bottom surfaces of the magnetic composite sheet on which the copper foil was laminated, and a part of the copper foil was etched. As a result, an antenna device having an upper pattern and a lower pattern was obtained.

  The magnetic sheet produced in Example 1, the magnetic composite sheet laminated with the copper foil produced in Example 2, and the antenna device produced in Example 3 were tested in the following procedure.

Experimental Example 1 Permeability measurement The permeability and magnetic loss of the magnetic sheet were measured using an impedance analyzer. The results are summarized in Table 1 below.

[Table 1]

  As shown in Table 1, the magnetic sheet according to this embodiment had excellent magnetic permeability in all three bands.

Experimental Example 2. Heat resistance measurement (reflow test)
The reflow test was performed twice under predetermined heat treatment conditions. Under the heat treatment conditions, a magnetic sheet, a magnetic composite sheet laminated with copper foil, and an antenna device are placed in an oven, the oven temperature is increased from 30 ° C. to 240 ° C. at a constant rate for 200 seconds, and then at a constant rate for 100 seconds. The oven temperature was lowered from 240 ° C. to 130 ° C. (see FIG. 15). Thereafter, changes in thickness, magnetic permeability, and bonding strength of each of the magnetic sheet, the magnetic composite sheet on which the copper foil was laminated, and the antenna device were measured.

  As a result, even if the reflow test was performed twice, no blisters were found on the entire surface of the magnetic sheet. Moreover, after performing the reflow test twice, the measured value of the thickness of a magnetic sheet and the change of the magnetic permeability were each less than 5%. Furthermore, after performing the reflow test twice, the measured value of the peel strength between the magnetic sheet and copper was 0.6 kgf / cm or more.

Experimental Example 3. Heat resistance measurement (Pb floating test)
The magnetic sheet and the magnetic composite sheet laminated with copper foil were floated in a molten lead bath and allowed to stand for 40 seconds, and then their surfaces were observed. As a result, no blisters were found on the entire surface of the magnetic composite sheet in which the magnetic sheet and the copper foil were laminated.

Experimental Example 4 Measurement of chemical resistance The magnetic sheet was immersed in a 2N HCl aqueous solution for about 30 minutes, and then changes in mass, thickness, and magnetic permeability of the magnetic sheet were measured. Further, the magnetic sheet was immersed in a 2N NaOH aqueous solution for about 30 minutes, and then changes in the mass, thickness, and magnetic permeability of the magnetic sheet were measured. As a result, no precipitation of the magnetic powder occurred at the bottom of the solution, and the measured values of the change in the mass, thickness, and permeability of the magnetic sheet were each 5% or less.

Experimental Example 5. Rust resistance measurement According to a salt spray test based on KS D9502, a neutral NaCl brine of 5% concentration was sprayed on a magnetic sheet at 35 ° C. for 72 hours at an average rate of 1 mL / hour to 2 mL / hour, and then rust formation was observed . As a result of measuring the occurrence of rust by the area method (rating number method), the measured number of ratings was 9.8 or more (in the rating number method, the degree of corrosion is evaluated by the ratio of the corroded area to the effective area). The degree of corrosion is evaluated on a scale of 0-10.)

Experimental Example 6. Peel strength measurement Using a universal (or universal) tester (UTM), the peel strength between the magnetic sheet and the copper foil of the magnetic sheet laminated with the copper foil was measured. As a result, a peel strength of 0.6 kgf / cm or more was measured.

Experimental Example 7. Bond strength measurement (cross cut test)
By the cross cut test (ASTM D3369), the bonding strength between the magnetic sheet and the copper foil of the magnetic sheet laminated with the copper foil was measured. As a result of the cross-cut test, a bonding strength of 0/100 to 5/100 was measured.

Experimental Example 8. High temperature and humidity resistance measurement After leaving the magnetic sheet in a constant temperature and humidity oven of 85% RH for 72 hours, changes in thickness and permeability of the magnetic sheet were measured. As a result, the measured values of the thickness of the magnetic sheet and the change in magnetic permeability were 5% or less, respectively.

Example 4: Preparation of magnetic sheet The procedure of steps (1) and (2) of Example 1 was repeated using sendust powder organically coated as the magnetic powder in step (1) of Example 1. A magnetic sheet was prepared.

Experimental Example 9. Breakdown voltage measurement Electrodes were installed on both sides of each of the magnetic sheets obtained in Example 1 and Example 4, and the breakdown voltage was measured by applying the voltage while gradually increasing the voltage.
As a result, the magnetic sheet obtained in Example 1 had a breakdown voltage of 4 kV, and the magnetic sheet obtained in Example 4 had a breakdown voltage of 4.3 kV.

Experimental Example 10 Measurement of Insulation Characteristics Using the magnetic sheet obtained in Example 4, a magnetic composite sheet in which copper foil was laminated was produced in the same manner as in Example 2. Thereafter, two via holes having a diameter of 400 μm were formed in the magnetic composite sheet on which the copper foil was laminated, and copper plating was performed in the via holes in the same manner as in Example 3. Moreover, although copper foil was etched like Example 3 and the upper pattern and the lower pattern were formed, it was not able to connect two via holes with a pattern. Thereafter, the resistance between the two via holes was measured while a current was passed through the two via holes.

  In this case, the resistance was measured while variously changing the interval between the two via holes to 500 μm, 700 μm, 900 μm, 1100 μm, 1400 μm, 2400 μm, 4400 μm, 6400 μm, and 8400 μm.

  Furthermore, a polyimide sheet and an adhesive layer were further inserted between the copper foil and the magnetic sheet to produce a composite sheet, and the resistance value after forming two via holes having various intervals as described above was measured. .

  As a result, the magnetic sheet of the embodiment had an infinite resistance value in all the intervals between the via holes and in all the forms of the composite sheet.

Claims (20)

An antenna device,
Magnetic sheet;
An antenna device comprising: an antenna pattern disposed on one or both sides of a magnetic sheet; and at least one via penetrating the magnetic sheet and connected to the antenna pattern. The magnetic sheet is a non-sintered sheet having a flexible thickness of 10 μm to 3000 μm, and the magnetic sheet comprises a binder resin and magnetic powder dispersed in the binder resin. Antenna devices. The magnetic sheet is based on alternating current having a frequency of 3 MHz, based on alternating current having a magnetic permeability of 100 to 300, based on alternating current having a frequency of 6.78 MHz, and having magnetic permeability of 80 to 270, and alternating current having a frequency of 13.56 MHz. The antenna device according to claim 1, having a magnetic permeability of 60 to 250. The antenna pattern comprises a first antenna pattern disposed on one side of the magnetic sheet, the antenna device further comprises a wiring pattern disposed on the other side of the magnetic sheet, and vias The antenna device according to claim 1, further comprising a first via penetrating the magnetic sheet and connected to one end of the first antenna pattern and one end of the wiring pattern. The first antenna pattern and the wiring pattern are formed of a conductive material, the first antenna pattern is directly bonded to one side of the magnetic sheet, and the wiring pattern is directly bonded to the other side of the magnetic sheet; The antenna device according to claim 4. The antenna device according to claim 4, wherein the first antenna pattern has a coil shape. The antenna device according to claim 4, wherein the magnetic sheet has a first via hole that vertically penetrates the magnetic sheet, and an inner wall of the first via hole is plated to form the first via. . A first terminal pattern disposed on one side of the magnetic sheet; and a second via penetrating the magnetic sheet, the second via being connected to the other end of the first terminal pattern and the wiring pattern. The antenna device according to claim 4. It further comprises a second terminal pattern disposed on one side of the magnetic sheet, the second terminal pattern being connected to the other end of the first antenna pattern, and the first terminal pattern and the second terminal pattern. 9. The antenna device of claim 8, wherein the antenna devices are arranged adjacent to each other. The antenna device according to claim 4, further comprising a first terminal pattern disposed on the other side of the magnetic sheet, wherein the first terminal pattern is connected to the other end of the wiring pattern. A second terminal pattern disposed on the other side of the magnetic sheet; and a second via penetrating the magnetic sheet, the second via connected to the other end of the second terminal pattern and the first antenna pattern The antenna device according to claim 10, wherein the first terminal pattern and the second terminal pattern are disposed adjacent to each other. The antenna pattern includes a plurality of first conductive line patterns arranged parallel to each other on one side of the magnetic sheet; and a plurality of second conductive lines arranged parallel to each other on the other side of the magnetic sheet. The first conductive line pattern extends in the same direction as the second conductive line pattern, and the via penetrates the magnetic sheet, and the first conductive line pattern and the second conductive line pattern The antenna device according to claim 1, comprising a plurality of vias connecting each other. Two second conductive line patterns in which one end and the other end of any first conductive line pattern are alternately connected to the first conductive line pattern and the second conductive line pattern arranged in parallel so as to be spaced apart from each other. The antenna device according to claim 12, wherein one end and the other end of any second conductive line pattern are respectively connected to two first conductive line patterns adjacent to each other. When the magnetic sheet is divided into a core region and a peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are disposed in the peripheral region, while the first conductive line pattern and the second conductive line pattern 13. The antenna of claim 12, wherein the line pattern traverses the core region and vias are disposed in the surrounding region to connect the end of the first conductive line pattern and the end of the second conductive line pattern. ·device. 15. The antenna device of claim 14, wherein the first conductive line pattern, the second conductive line pattern, and the via are connected to each other to form a coil that surrounds the core region. A portable terminal comprising a case and an antenna device disposed in the case,
The case has an electromagnetic wave transmission region and an electromagnetic wave non-transmission region,
The antenna device includes: a magnetic sheet; a plurality of first conductive line patterns arranged in parallel to be separated from each other on one side of the magnetic sheet; a plurality of second conductive lines arranged in parallel to be separated from each other on the other side of the magnetic sheet. A conductive line pattern; and a plurality of vias penetrating the magnetic sheet;
A portable terminal in which the extending direction of the first conductive line pattern and the extending direction of the second conductive line pattern are the same, and the electromagnetic wave transmission region is arranged in parallel with the first conductive line pattern and the second conductive line pattern . When the magnetic sheet is divided into a core region and a peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are disposed in the peripheral region, while the first conductive line pattern and the second conductive line pattern 17. The portable of claim 16, wherein the line pattern traverses the core region and vias are disposed in the surrounding region to connect the end of the first conductive line pattern and the end of the second conductive line pattern. Terminal. The portable terminal of claim 17, wherein the first conductive line pattern, the second conductive line pattern, and the via are connected to each other to form a coil surrounding the core region. The antenna device generates an electromagnetic signal in a direction orthogonal to the extending direction of the first conductive line pattern and the second conductive line pattern, and the electromagnetic signal travels outside the case through the electromagnetic wave transmission region. The portable terminal described in 1. The portable terminal according to claim 16, wherein the electromagnetic wave transmission region comprises glass or plastic, and the electromagnetic wave non-transmission region comprises metal.