TWI673731B - Method of preparing conductive magnetic composite sheet and antenna device - Google Patents

Abstract

According to a method of manufacturing a conductive magnetic composite sheet, the method includes manufacturing a magnetic sheet including magnetic powder and a binder resin; stacking the magnetic sheet and a first conductive foil; and applying heat and pressure to the obtained stack to bond the stack The magnetic sheet and the first conductive foil can be used to produce a conductive magnetic composite having excellent interlayer adhesion between the magnetic sheet and the conductive foil, and having excellent magnetic properties at NFC, WPC, and MST frequencies sheet.

Description

Method for manufacturing conductive magnetic composite sheet and antenna device

FIELD OF THE INVENTION Embodiments relate to a method of manufacturing a conductive magnetic composite sheet that can be used in fields such as near field communication, wireless power charging, and magnetic security transmission, and a method of manufacturing an antenna device.

BACKGROUND OF THE INVENTION Recently, antennas for implementing functions such as near field communication (NFC), wireless power charging (WPC), and magnetic security transmission (MST) are being installed in mobile devices such as mobile phones, tablet PCs, and notebook PCs. However, other metal parts exist in such mobile devices, and eddy currents occur when an alternating magnetic field formed in the device is applied to such metal parts, which results in degradation of antenna performance and reduction in recognition distance.

Conventionally, in order to solve the above problems, an antenna device having multiple uses is produced by attaching a high-permeability fertilizer iron sheet to one side of a typical circuit board (antenna) such as a polyimide substrate, which is a typical circuit The board has an antenna pattern layer formed on the other side thereof. This uses the following principle: a magnetic body, such as a fat iron sheet, focuses the magnetic flux of the antenna, prevents the penetration of magnetic fields into the metal surface and the generation of eddy currents, and improves the operating characteristics.

SUMMARY OF THE INVENTION Technical Problem However, in this situation, that is, when the circuit board to which the magnetic sheet is adhered is installed as an antenna device in a mobile device, the efficiency of the internal space of the mobile device inevitably limited by the assembly of various parts Becomes lower. In addition, delamination may occur due to the weak adhesion between the circuit board and the magnetic sheet.

Therefore, an attempt has been made to manufacture an antenna device by using a magnetic sheet as a substrate so that a conductive foil is laminated on the substrate and then forming an antenna pattern by etching. However, for this attempt to be achieved, strong interlayer adhesion must be fastened so that delamination is performed at high temperatures such as reflow or soldering processes performed for the manufacture of the antenna device or the application of the antenna device to the product It does not occur during thermal treatment.

Therefore, one object of the embodiments is to provide a method for manufacturing a conductive magnetic composite sheet having excellent interlayer adhesion and magnetic properties. The conductive magnetic composite sheet can be used for applications such as near field communication (NFC) and wireless power charging (WPC). And multiple applications of magnetic security transmission (MST). In addition, another object of the embodiment is to provide a method for manufacturing an antenna device using a conductive magnetic composite sheet. Problem solution

According to an embodiment, there is provided a method of manufacturing a conductive magnetic composite sheet, the method including manufacturing a magnetic sheet including a magnetic powder and a binder resin; stacking the magnetic sheet and a first conductive foil; and applying heat and pressure to the obtained To stack the magnetic sheet and the first conductive foil together.

In an embodiment, the adhesive resin may be a thermosetting resin, and the adhesive resin may adhere the magnetic sheet to the first conductive foil when curing in the step of applying heat and pressure to the stack.

In addition, in an embodiment, the first conductive foil may have a first primer layer formed on one side thereof, and the magnetic sheet and the first conductive foil may be stacked such that one side of the magnetic sheet In contact with the first primer layer of the first conductive foil.

According to another embodiment, a method for manufacturing a conductive magnetic composite sheet is provided. The method includes manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking a first conductive foil, the magnetic sheet, and a second conductive foil; and Heat and pressure are applied to the obtained stack to adhere the first conductive foil, the magnetic sheet, and the second conductive foil together.

According to another embodiment, a method of manufacturing an antenna device is provided. The method includes manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking the magnetic sheet and a first conductive foil; applying heat and pressure to the obtained stack to Bonding the magnetic sheet and the first conductive foil; and etching the first conductive foil to form an antenna pattern in the first conductive foil. Advantageous effects of the invention

According to the embodiment, a conductive magnetic composite sheet having excellent interlayer adhesion between a magnetic sheet and a conductive foil and having excellent magnetic properties at NFC, WPC, and MST frequencies can be manufactured. In particular, interlayer delamination of the conductive magnetic composite sheet manufactured according to the embodiment may not occur even under severe environmental conditions, such as high-temperature heat treatment applied to the conductive magnetic composite sheet to a product.

According to a specific embodiment, because a magnetic sheet containing a semi-cured or uncured thermosetting resin is stacked with a conductive foil and the thermosetting resin is cured by heat and pressure, the magnetic sheet and the conductive foil can be used without a separate adhesive layer. It is laminated with excellent adhesive strength. Therefore, since the process of forming the adhesive layer by applying the adhesive and drying the adhesive coating is not required, the process efficiency and economic efficiency can be improved. In addition, the total thickness can be reduced due to the absence of the adhesive layer and degradation of magnetic properties due to the adhesive layer can be prevented.

In addition, according to another specific embodiment, the primer layer formed on one side of the conductive foil is cured by heat and pressure during lamination with the magnetic sheet, which can enhance the adhesion strength between the conductive foil and the magnetic sheet. . Therefore, delamination does not occur during high-temperature thermal processing such as reflow or soldering processes performed for the manufacture of the antenna device or the application of the antenna device to the product. In addition, the cured primer layer can prevent rust or deformation from occurring in the magnetic powder in the magnetic sheet in various external environments by also serving as a protective layer of the magnetic sheet, and can also protect the magnetic sheet from being used in an antenna. The etchant used in the patterning of the device plays a role.

In addition, the magnetic sheet may not only have excellent flexibility such as a polymer-based sheet, but also may contain a large amount of magnetic powder to have excellent magnetic properties.

Therefore, the conductive magnetic composite sheet and the antenna device manufactured by the method according to the embodiment can be suitable for NFC, WPC, and MST.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to an embodiment, a method for manufacturing a conductive magnetic composite sheet is provided. The method includes: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking the magnetic sheet and a first conductive foil; and Heat and pressure were applied to the obtained stack to adhere the magnetic sheet and the first conductive foil together.

In this embodiment, the steps of applying heat and pressure to the stack may be performed at a pressure of 5 MPa to 30 MPa and a temperature of 150 ° C to 200 ° C.

In addition, the stacking step and the step of applying heat and pressure to the stack can be performed by a roll-to-roll process which uses 2 to 10 pairs of rolls at a roll temperature of 150 ° C to 200 ° C, 5 MPa to 30 It is performed at a roll pressure of MPa and a speed of 1 m / min to 5 m / min.

In addition, the magnetic sheet may be an unsintered sheet having flexibility and a thickness of 10 μm to 3,000 μm.

In addition, the magnetic sheet may include 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of a polyurethane-based resin, and 0.5% to 2% by weight of a magnetic powder. Isocyanate hardeners, and 0.3 to 1.5% by weight of epoxy-based resins are used as binder resins.

In addition, the magnetic sheet may have a magnetic permeability of 100 to 300 based on an alternating current having a frequency of 3 MHz, a magnetic permeability of 80 to 270 based on an alternating current having a frequency of 6.78 MHz, and a magnetic permeability based on an alternating current having a frequency of 13.56 MHz. Permeability of 60 to 250.

In addition, the conductive magnetic composite sheet may have a peel strength of 0.6 kgf / cm or more between the magnetic sheet and the first conductive foil when subjected to two thermal treatments, which are performed at a constant rate from 30 The composition was heated to 240 ° C for 200 seconds and then cooled from 240 ° C to 130 ° C for 100 seconds at a constant rate.

In addition, the adhesive resin may be a thermosetting resin, and the adhesive resin may adhere the magnetic sheet to the first conductive foil when the adhesive resin is cured in a step of applying heat and pressure to the stack.

In this case, the conductive magnetic composite sheet may have a peeling strength of 0.6 kgf / cm or more between the magnetic sheet and the first conductive foil when subjected to two thermal treatments, the thermal treatment being performed by a constant The composition is heated at a rate from 30 ° C to 240 ° C for 200 seconds, and then cooled at a constant rate from 240 ° C to 130 ° C for 100 seconds, wherein the magnetic sheet may be unsintered having a thickness of 10 μm to 3,000 μm with flexibility. And the magnetic sheet may have a permeability of 100 to 300 based on an alternating current having a frequency of 3 MHz; a permeability of 80 to 270 based on an alternating current having a frequency of 6.78 MHz; based on an alternating current having a frequency of 13.56 MHz A magnetic permeability of 60 to 250; a change of 5% or less in thickness and a permeability change of 5% or less when subjected to two thermal treatments, the thermal treatment being heated from 30 ° C to 240 at a constant rate ℃ for 200 seconds and then cooled at a constant rate from 240 ℃ to 130 ℃ for 100 seconds; 5% or less thickness change and 5% or less magnetic permeability when immersed in 2 N hydrochloric acid solution for 30 minutes Changes; and 5% or 30% immersion in 2 N sodium hydroxide solution And less change in thickness of 5% or less of the permeability change.

In addition, the first conductive foil may have a first primer layer formed on one side thereof, and the magnetic sheet and the first conductive foil may be stacked such that one side of the magnetic sheet is in the first position with the first conductive foil. A primer layer is in contact.

In this case, the first primer layer may include a thermosetting resin, and the thermosetting resin in the first primer layer may be cured in a step of applying heat and pressure to the stack.

In addition, the thermosetting resin may include a bisphenol A type epoxy resin, a cresol novolac type epoxy resin, or a (glycidyloxyphenyl) ethane type epoxy resin.

In addition, the first primer layer may have a thickness of 0.01 μm to 1 μm.

According to another embodiment, a method for manufacturing a conductive magnetic composite sheet is provided. The method includes manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking a first conductive foil, the magnetic sheet, and a second conductive foil; and Heat and pressure are applied to the obtained stack to adhere the first conductive foil, the magnetic sheet, and the second conductive foil together.

In this embodiment, the adhesive resin may be a thermosetting resin, and the magnetic resin sheet may be adhered to the first conductive foil when the adhesive resin is cured in a step of applying heat and pressure to the stack.

In addition, the first conductive foil may have a first primer layer formed on one side thereof, the second conductive foil may have a second primer layer formed on one side thereof, and the magnetic sheet and the first conductive foil may After being stacked, one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil, and the magnetic sheet and the second conductive foil may be stacked so that the other side of the magnetic sheet is in contact with the second conductive foil. The second primer layer is in contact, the first primer layer and the second primer layer may include a thermosetting resin, and the thermosetting resin in the first primer layer and the second primer layer may apply heat and pressure to the stack. Cured in steps.

According to another embodiment, a method of manufacturing an antenna device is provided. The method includes manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking the magnetic sheet and a first conductive foil; applying heat and pressure to the obtained stack to Bonding the magnetic sheet and the first conductive foil; and etching the first conductive foil to form an antenna pattern in the first conductive foil.

In this embodiment, the adhesive resin may be a thermosetting resin, and the adhesive resin may adhere the magnetic sheet and the first conductive foil when the adhesive resin is cured in a step of applying heat and pressure to the stack.

In addition, the first conductive foil may have a first primer layer formed on one side thereof, and the magnetic sheet and the first conductive foil may be stacked such that one side of the magnetic sheet is in first contact with the first conductive foil. The primer layer is in contact. The first primer layer may include a thermosetting resin, and the thermosetting resin in the first primer layer may be cured in a step of applying heat and pressure to the stack.

In addition, the magnetic sheet may be an unsintered sheet having flexibility with a thickness of 10 μm to 3,000 μm, and the magnetic sheet may have a magnetic permeability of 100 to 300 based on AC power having a frequency of 3 MHz; based on having 6.78 MHz Permeability of AC to 80 to 270 frequency; 60 to 250 permeability based on AC with frequency of 13.56 MHz; 5% or less thickness change and 5% or less when subjected to two thermal treatments With less change in magnetic permeability, the thermal treatment consists of heating at a constant rate from 30 ° C to 240 ° C for 200 seconds and then cooling at a constant rate from 240 ° C to 130 ° C for 100 seconds; immersed in 2 N hydrochloric acid solution 30 5% or less thickness change at 5 minutes and 5% or less change in magnetic permeability; and 5% or less thickness change and 5% or less when immersed in 2 N sodium hydroxide solution for 30 minutes Less magnetic permeability changes.

In the following description of the embodiments, it will be understood that when a layer, foil or sheet is referred to as being "on" or "under" another layer, foil or sheet, the terms "on" and "under" Learning includes the two meanings of "directly" and "indirectly". In addition, references to each element and below each element will be made based on the drawings. In the drawings, the size or interval of each element may be exaggerated for better understanding, and the content understood by those skilled in the art may not be illustrated.

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

The magnetic sheet 100 includes a magnetic powder 110 and a binder resin 120.

That is, the magnetic sheet 100 may be a polymerized magnetic sheet (PMS). Specifically, the magnetic sheet 100 may be an unsintered cured sheet containing the magnetic powder 110 and the binder resin 120. In addition, the magnetic sheet 100 may be a flexible magnetic sheet.

The magnetic sheet 100 contains a magnetic powder 110.

The magnetic powder may be an oxide magnetic powder such as ferrous iron (Ni-Zn based ferrous iron, Mg-Zn based ferrous iron, or Mn-Zn based ferrous iron); a metal magnetic powder such as a high magnetic permeability alloy, an alumino-silicon iron powder, Fe-Si -Cr alloy, and Fe-Si nanocrystals; or mixed powders of each of the above. For example, the magnetic powder may be an alumino-silicon iron powder having a Fe-Si-Al alloy composition.

As a specific example, the magnetic powder may have a composition of Formula 1 below. [Formula 1] Fe _1-abc Si _a X _b Y _c 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 a combination thereof; and 0.01 ≤ a ≤ 0.2, 0.01 ≤ b ≤ 0.1, and 0 ≤ c ≤ 0.05.

The particle diameter of the magnetic powder is in a range of about 3 nm to about 1 mm. For example, the particle diameter of the magnetic powder may be in a range of about 1 μm to about 300 μm, about 1 μm to about 50 μm, or 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 achieved and short circuits can be prevented when a path is formed in the magnetic sheet.

Magnetic powder can be coated with functional materials. For example, the surface of the individual particles of the magnetic powder may be corrosion-resistant or insulatingly coated.

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

Therefore, the individual particles of the magnetic powder may be composed of the magnetic core and a shell surrounding the surface of the magnetic core. In this case, the magnetic core may contain an oxide magnetic material such as ferrous iron; a metal magnetic material such as a high magnetic permeability alloy, alumino-silicon iron powder, Fe-Si-Cr alloy, and Fe-Si nanocrystals; or each Of mixed components. In addition, the housing may contain a polymer resin having corrosion resistance and / or insulation properties. The thickness of the shell can be in the range of 0.1 μm to 20 μm, or 1 μm to 10 μm.

A curable resin may be used as the adhesive resin 120. In particular, the binder resin may include a photo-curable resin, a thermosetting resin, and / or a highly heat-resistant thermoplastic resin, and may preferably include a thermosetting resin.

As the resin that can be cured to exhibit adhesion, a resin including: at least one heat-curable functional group or part such as glycidyl group, isocyanate group, hydroxyl group, carboxyl group, or amido group; or at least one reactive It is possible to cure functional groups or moieties, such as epoxy, cyclic ether, sulfide, acetal or lactone. This functional group or part may be, for example, an isocyanate group (-NCO), a hydroxyl group (-OH), or a carboxyl group (-COOH).

In particular, examples of the curable resin may be 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, but may be The cured resin is not limited to each of the above.

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

The polyurethane-based resin may include a repeating unit represented by the following formulae 2a and 2b. [Formula 2a] [Formula 2b] In Formulas 2a and 2b, R ₁ and R ₃ are each independently C _1-5 alkylene, ureido, or ether group; R ₂ and R ₄ are each independently C _1-5 alkylene; and C Each of the _1-5 alkylene groups is unsubstituted or substituted with at least one substituent selected from the group consisting of halogen, cyano, amine, and nitro.

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.

Polyurethane-based resins may have a number average of about 500 g / mol to about 50,000 g / mol, about 10,000 g / mol to about 50,000 g / mol, or about 10,000 g / mol to about 40,000 g / mol Molecular weight. The isocyanate-based hardener may be an organic diisocyanate.

For example, the isocyanate-based hardener may be an aromatic diisocyanate, an aliphatic diisocyanate, an alicyclic diisocyanate, or a mixture thereof.

The aromatic diisocyanate may be, for example, a diisocyanate having one to two C _6-20 aryl groups, and specifically may be 1,5-naphthalene diisocyanate, 4,4′-diphenylmethane diisocyanate, 4,4 '-Diphenyl-dimethylmethane diisocyanate, 4,4'-benzyl isocyanate, dialkyl-diphenylmethane diisocyanate, tetraalkyl-diphenylmethane diisocyanate, 1,3-phenylene diisocyanate Isocyanate, 1,4-phenylene diisocyanate, xylylene diisocyanate, or xylene diisocyanate.

The alicyclic diisocyanate may be, for example, a diisocyanate having one to two C _6-20 cycloalkyl groups, and specifically may be cyclohexane-1,4-diisocyanate, isophorone diisocyanate, bicyclic Hexylmethane-4,4'-diisocyanate, 1,3-bis (methyl isocyanate) cyclohexane, or methylcyclohexane diisocyanate.

Preferably, the isocyanate-based hardener may be an alicyclic diisocyanate, and may particularly be isophorone diisocyanate.

Examples of epoxy-based resins may be bisphenol type epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, and tetrabromobisphenol A type epoxy resin. Resin; Spiral epoxy resin; Naphthalene epoxy resin; Biphenyl epoxy resin; Terpene epoxy resin; Glycidyl ether epoxy resin such as tris (glycidyloxyphenyl) methane (Glycidyloxyphenyl) ethane; glycidylamine type epoxy resins such as tetraglycidyldiaminediphenylmethane; phenolic epoxy resins such as cresol novolac epoxy resin, phenol novolac type ring Oxygen resin, α-naphthol novolac epoxy resin, and brominated phenol novolac epoxy resin. These epoxy-based resins may be used alone or in a combination of two or more thereof.

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

The epoxy-based resin may have an epoxy equivalent weight of about 80 g / eq to about 1,000 g / eq, or about 100 g / eq to about 300 g / eq. In addition, the epoxy-based resin may have a number average molecular weight of about 10,000 g / mol to about 50,000 g / mol.

In addition, the magnetic sheet 100 may include 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 may be amines, urea, mercaptobenzothiazole (MBT), benzotriazole, tolyltriazole, aldehydes, heterocyclic nitrogen compounds, sulfur compounds, acetylenic compounds, ascorbic acid, Succinic acid, tryptamine, or caffeine.

For example, the corrosion inhibitor may be N-benzyl-N, N-bis [(3,5-dimethyl-1H-pyrazol-1-yl) methyl] amine, 4- (1-methyl-1 -Phenethyl) -N- [4- (1-methyl-1-phenethyl) phenyl] aniline, tris (benzimidazol-2-ylmethyl) amine, N- (2-furyl) -P-toluidine, N- (5-chloro-2-furyl) -p-toluidine, N- (5-nitro-2-furyl) -p-toluidine, N- (5-methyl-2- Furfuryl) -p-toluidine, N- (N-piperidinylmethyl) -3-[(dihydropyridyl) amino] isatin, [ethylene-3- (3,5-di-tert-butyl) 4-hydroxyphenyl) propionate] methane, or a mixture of each of the foregoing.

The magnetic sheet may include magnetic powder in an amount of 50% by weight or more, or 70% by weight or more. For example, the magnetic sheet may include 50% to 95% by weight, 70% to 90% by weight, 70% to 90% by weight, 75% to 90% by weight, 75% to 95% by weight, and 80% by weight. To 95% by weight, or 80% to 90% by weight of magnetic powder. In this case, the magnetic powder may have a composition of Formula 1.

In addition, the magnetic sheet may include a binder resin in an amount of 5 to 40% by weight, 5 to 20% by weight, 5 to 15% by weight, or 7 to 15% by weight.

In addition, the magnetic sheet may include 6% to 12% by weight of a polyurethane-based resin, 0.5% to 2% by weight of an isocyanate-based hardener, and 0.3% to 1.5% by weight based on the total weight of the magnetic sheet. Epoxy resin based on weight% as a binder resin.

In addition, the magnetic sheet may include a corrosion inhibitor in an amount of 1 to 10% by weight, 1 to 8% by weight, or 3 to 7% by weight.

According to a specific example, the magnetic sheet may include 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of a polyurethane-based resin, and 0.5% to 2% by weight. % Of the isocyanate-based hardener and 0.3% to 1.5% by weight of the epoxy-based resin as the binder resin. In addition, in this state, the magnetic powder has a composition of Formula 1, the polyurethane-based resin includes a repeating unit represented by Formulas 2a and 2b, and the isocyanate-based hardener may be an alicyclic diisocyanate, and based on The epoxy resin may be a bisphenol A epoxy resin, a cresol novolac epoxy resin, or a (glycidyloxyphenyl) ethane epoxy resin.

The thickness of the magnetic sheet is in a range of about 10 μm to about 3,000 μm. For example, the thickness of the magnetic sheet 100 may be 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 In the range of about 50 μm to about 100 μm.

The magnetic sheet may have a magnetic permeability of about 100 to about 300 based on an alternating current having a frequency of 3 MHz, a magnetic permeability of about 80 to about 270 based on an alternating current having a frequency of 6.78 MHz, and a magnetic permeability based on a frequency of 13.56 MHz. Permeability of alternating current of about 60 to about 250.

In addition, the magnetic sheet may have a magnetic permeability of about 190 to about 250 based on an alternating current having a frequency of 3 MHz, may have a magnetic permeability of about 180 to about 230 based on an alternating current having a frequency of 6.78 MHz, and may have a magnetic permeability based on Permeability of an alternating current having a frequency of 13.56 MHz from about 140 to about 180.

In addition, the magnetic sheet may have flexibility for use in various devices. For example, the magnetic sheet may not be cut after 100, 1,000, or 10,000 bends in the MIT folding test at 90 degrees and 35 RPM. In addition, the magnetic sheet may have a magnetic permeability change of about 10% or less after 100, 1,000, or 10,000 bends in the MIT folding test at 90 degrees and 35 RPM. .

In addition, the magnetic sheet may have a change in thickness of about 5% or less and a change in permeability of about 5% or less when subjected to two thermal treatments, which are heated from 30 ° C to 240 ° C at a constant rate Composition for 200 seconds and subsequent cooling from 240 ° C to 130 ° C for 100 seconds at a constant rate. In particular, when the thermal treatment is repeated twice, the magnetic sheet may have a thickness change of about 3% or less and a magnetic permeability change of about 3% or less, and more specifically may have about 1% or less Less change in thickness and change in permeability of about 1% or less.

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

In addition, the magnetic sheet may have corrosion resistance capable of withstanding various corrosive environments. For example, a magnetic sheet may have a rating of 9.8 or more in a salt spray test according to KS D 9502. The rating method is an evaluation method that indicates the degree of corrosion by the ratio of the corrosion area to the effective area, where the degree of corrosion is rated on a scale from 0 to 10.

In addition, the magnetic sheet may have a weight change of about 10% or less, or about 5% or less, when immersed in a solution of about 2 N NaCl for 10 minutes. In addition, the magnetic sheet may have a permeability change of about 10% or less, or about 5% or less, when immersed in a solution of about 2 N NaCl for 10 minutes.

In addition, when the magnetic sheet is subjected to heat and humidity conditions of 85 ° C and 85% RH for 72 hours, both the thickness change and the magnetic permeability change of the magnetic sheet may be 10% or less, and specifically 5% or less. , And more specifically 2% or less.

In addition, the magnetic sheet may have a high breakdown voltage. For example, the magnetic sheet may have a breakdown voltage of 3 kV or more, 3.5 kV or more, or 4 kV or more. In particular, 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.

In addition, the magnetic sheet may have excellent insulation properties. For example, when a current is applied between two points spaced 500 μm or more apart from each other on a sheet, the magnetic sheet may have 1 × 10 ⁵ Ω or more, 1 × 10 ⁷ Ω or more, or 1 × 10 ⁹ Ω or greater resistance. Preferably, when a current is applied between two points spaced 500 μm or more apart from each other on the sheet, the measurement of the resistance value of the magnetic sheet may be impossible, or the magnetic sheet may have an infinite resistance value.

The magnetic sheet according to the embodiment can be manufactured by a method including the following steps: mixing magnetic powder and a binder resin, molding the mixture in the form of a sheet, and drying the sheet. In this case, the same type and amount of magnetic powder and adhesive resin as the magnetic powder and adhesive resin exemplified above can be used.

Specifically, the magnetic sheet may be manufactured by a method including the following steps: (i) dispersing magnetic powder in a binder resin and a solvent to produce a slurry; and (ii) molding the slurry and a dried sheet in the form of a sheet.

According to an embodiment, a method for manufacturing a magnetic sheet includes the following steps: (1) mixing a polyurethane-based resin, an isocyanate-based hardener, and an epoxy-based resin to manufacture an adhesive resin; (2) Mixing magnetic powder and an organic solvent with a binder resin to produce a slurry; and (3) molding the slurry into a sheet form and a dry sheet, wherein the magnetic sheet includes 6 to 12% by weight based on the total weight of the magnetic sheet Polyurethane resins, 0.5 to 2% by weight of isocyanate-based hardeners, and 0.3 to 1.5% by weight of epoxy-based resins are used as binder resins.

As a specific example, magnetic powder and polyurethane-based resins, isocyanate-based hardeners, and epoxy-based resins are first added to the solvent, and by means of a dispersing machine (planetary mixer, high-speed mixer) , Beadless pulverizer, etc.) to produce a slurry having a viscosity of about 100 cPs to about 10,000 cPs. Thereafter, the carrier film was coated with a slurry by a comma coater to be formed into a dry magnetic sheet. Dry magnetic sheets can be made into polymer magnetic sheets (PMS) by controlling the speed and temperature depending on the desired thickness, using a desiccant to remove the solvent, and winding the molded sheet.

Referring to FIG. 3, in a state of a manufacturing process of the dry magnetic sheet 101 performed by a roll-to-roll process, a slurry including magnetic powder and an adhesive resin may be coated on a carrier film 400 by a coating machine 500, and then After drying, a dry magnetic sheet 101 is manufactured. In this case, the adhesive resin 121 in an uncured or semi-cured state may be contained in the dry magnetic sheet 101.

Therefore, the dry magnetic sheet thus manufactured may be a magnetic sheet in which the curing of the adhesive resin is not completed.

In addition, the magnetic sheet can be cured by hot pressing after drying.

That is, the method for manufacturing a magnetic sheet may further include the following steps: after step (3), the bonding in the magnetic sheet is cured by hot pressing the magnetic sheet at a pressure of 1 MPa to 100 MPa and a temperature of 100 ° C to 300 ° C.剂 材料。 Resin.

Therefore, the obtained magnetic sheet may be a magnetic sheet in which the curing of the adhesive resin is completed.

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

2A and 2B illustrate cross-sectional views of a conductive magnetic composite sheet according to an embodiment. Referring to FIG. 2A, a conductive magnetic composite sheet according to an embodiment has a magnetic sheet 100, a first conductive foil 210, and a second conductive foil 220. Referring to FIG. 2B, the conductive magnetic composite sheet according to the embodiment may further have a first primer layer 310 and a second primer layer 320.

A conductive magnetic composite sheet according to a preferred embodiment includes: a magnetic sheet including a magnetic powder and an adhesive resin; and a first conductive foil which is directly adhered to one side of the magnetic sheet. The conductive magnetic composite sheet may further include a second conductive foil, which is directly bonded to the other side of the magnetic sheet.

A conductive magnetic composite sheet according to another preferred embodiment includes: a magnetic sheet including a magnetic powder and an adhesive resin; a first conductive foil provided on one side of the magnetic sheet; and a first primer layer, which It is disposed between the magnetic sheet and the first conductive foil to adhere the magnetic sheet and the first conductive foil together. The conductive magnetic composite sheet may further include: a second conductive foil provided on the other side of the magnetic sheet; and a second primer layer provided between the magnetic sheet and the second conductive foil to make the magnetic The sheet and the second conductive foil are bonded together.

Therefore, 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 copper foil laminated magnetic composite sheet.

The magnetic sheet 100 included in the conductive magnetic composite sheet may have substantially the same composition and properties as the magnetic sheet according to the embodiment described above, and may also be manufactured by a substantially same method.

The magnetic sheet 100 may have a permeability of 100 to 300 based on an alternating current having a frequency of 3 MHz, a permeability of 80 to 270 based on an alternating current having a frequency of 6.78 MHz, and a 60 based on an alternating current having a frequency of 13.56 MHz. Permeability to 250.

According to a specific example, the magnetic sheet may include 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of a polyurethane-based resin, 0.5% to 2% by weight. % Of the isocyanate-based hardener and 0.3% to 1.5% by weight of the epoxy-based resin as the binder resin. In addition, in this state, the magnetic powder has a composition of Formula 1, the polyurethane-based resin includes a repeating unit represented by Formulas 2a and 2b, and the isocyanate-based hardener may be an alicyclic diisocyanate, and based on The epoxy resin may be a bisphenol A epoxy resin, a cresol novolac epoxy resin, or a (glycidyloxyphenyl) ethane epoxy resin.

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

The conductive foil may include a conductive material. For example, the conductive foil may include a conductive metal. That is, the conductive foil may 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 may be a metal foil. For example, the conductive foil may be a copper foil.

The thickness of the conductive foil may be in a range of about 6 μm to about 200 μm, for example, about 10 μm to about 150 μm, about 10 μm to about 100 μm, or about 20 μm to about 50 μm.

According to a preferred embodiment, as illustrated 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 directly in contact with the surface of the magnetic sheet. In this case, the conductive foil can be directly bonded to the adhesive resin of the magnetic sheet. In particular, the conductive foil can be directly bonded to a thermosetting resin constituting an adhesive resin.

The adhesive layer may be provided between the magnetic sheet and the conductive foil. That is, the conductive magnetic composite sheet may further include an adhesive layer provided between the magnetic sheet and the conductive foil, and in this case, the adhesive layer may be directly in 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 may be in a range of about 0.1 μm to about 20 μm. Specifically, the thickness of the adhesive layer may be in a range of about 0.1 μm to about 10 μm, about 1 μm to about 7 μm, or about 1 μm to about 5 μm.

The adhesive layer may include a thermosetting resin or a highly heat-resistant thermoplastic resin. In particular, the adhesive layer may include an epoxy-based resin. The adhesive layer can adhere the magnetic sheet to the conductive foil by thermal curing. Therefore, the adhesive layer can have high heat resistance and high adhesion.

For example, the adhesive layer may have high chemical resistance by including a thermosetting resin. Therefore, the adhesive layer can play a role in protecting the magnetic sheet. That is, when the conductive foil is etched with an 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 through an adhesive layer, the conductive foil can be bonded with high adhesive strength. In particular, since the conductive foil is adhered by curing a thermosetting resin or an adhesive layer constituting the magnetic sheet, the adhesion strength between the magnetic sheet and the conductive foil does not decrease even when subjected to a high-temperature heat treatment process.

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

Therefore, the primer layer can adhere the conductive foil to the magnetic sheet. The thickness of the primer layer may be in a range of about 0.01 μm to about 20 μm. Specifically, the thickness of the primer layer may be in a range of about 0.01 μm to about 10 μm, about 0.01 μm to about 7 μm, about 0.01 μm to about 5 μm, or 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 may include a thermosetting resin or a highly heat-resistant thermoplastic resin, and may specifically include an epoxy-based resin.

As a specific example, the first primer layer (and the second primer layer) may include a thermosetting resin, and the thermosetting resin in the first primer layer (and the second primer layer) may apply heat and pressure to the stack. During the curing step.

Examples of epoxy-based resins may be bisphenol type epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, and tetrabromobisphenol A type epoxy resin. Resin; Spiral epoxy resin; Naphthalene epoxy resin; Biphenyl epoxy resin; Terpene epoxy resin; Glycidyl ether epoxy resin such as tris (glycidyloxyphenyl) methane (Glycidyloxyphenyl) ethane; glycidylamine type epoxy resins such as tetraglycidyldiaminediphenylmethane; phenolic epoxy resins such as cresol novolac epoxy resin, phenol novolac type ring Oxygen resin, α-naphthol novolac epoxy resin, and brominated phenol novolac epoxy resin. These epoxy-based resins may be used alone or in a combination of two or more thereof.

Among these resins, bisphenol A type epoxy resin, cresol novolac type epoxy resin, or (glycidyloxyphenyl) ethane type epoxy resin can be used in consideration of adhesion and heat resistance. In the first primer layer (and the second primer layer).

The epoxy-based resin may have an epoxy equivalent weight of about 80 g / eq to about 1,000 g / eq, or about 100 g / eq to about 300 g / eq. In addition, the epoxy-based resin may have a number average molecular weight of about 10,000 g / mol to 50,000 g / mol.

As a specific example, the first primer layer (and the second primer layer) may have a thickness of 0.01 μm to 1 μm, and may include a bisphenol A type epoxy resin, a cresol novolac type epoxy resin, or Glycidyloxyphenyl) ethane type epoxy resin.

The primer layer can adhere the magnetic sheet to the conductive foil by thermal curing. Therefore, the primer layer can have high heat resistance and high adhesive strength.

In addition, the primer layer may have high chemical resistance by including a thermosetting resin. Therefore, the primer layer can play a role in protecting the magnetic sheet. That is, when the conductive foil is etched with an etchant, the primer layer can protect the magnetic sheet from the etchant.

Conductive foil is adhered by curing of a thermosetting resin or primer layer constituting a magnetic sheet, even if the conductive foil is subjected to high-temperature heat such as reflow or soldering processes performed for the conductive foil to the product. During the treatment process, the adhesive strength between the magnetic sheet and the conductive foil can be maintained.

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

In addition, when the conductive magnetism was subjected to two thermal treatments, the thermal treatment consisted of heating from 30 ° C to 240 ° C at a constant rate for 200 seconds and then cooling from 240 ° C to 130 ° C for 100 seconds at a constant rate. The composite sheet may have 0.6 kgf / cm or more between the conductive foil and the magnetic sheet, for example, 0.6 kgf / cm to 20 kgf / cm, 0.6 kgf / cm to 10 kgf / cm, 0.6 kgf / cm to Peel strength of 5 kgf / cm, or 0.6 kgf / cm to 3 kgf / cm.

In addition, when the thermal treatment is repeated twice under the above conditions, the change rate (decrease rate) of 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 regard to the conductive magnetic composite sheet according to the embodiment, even if the conductive magnetic composite sheet is subjected to a soldering process such as a reflow process, there are minimal changes in physical properties such as magnetic permeability and thickness, and such as a magnetic sheet and a conductive foil. Defects between delaminations do not occur.

A method of manufacturing a conductive magnetic composite sheet according to an embodiment includes the following steps: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking the magnetic sheet and the first conductive foil; and applying heat and pressure to the obtained stack to bond A magnetic sheet and a first conductive foil.

In this embodiment, the adhesive resin may be a thermosetting resin, and the adhesive resin may adhere the magnetic sheet to the first conductive foil when curing in the step of applying heat and pressure to the stack.

In addition, in this embodiment, the first conductive foil may have a first primer layer formed on one side thereof, and the magnetic sheet and the first conductive foil may be stacked such that one side of the magnetic sheet is in contact with the first The first primer layer of a conductive foil is in contact.

A method for manufacturing a conductive magnetic composite sheet according to another embodiment includes the following steps: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking a first conductive foil, a magnetic sheet, and a second conductive foil; and applying heat and pressure Apply to the obtained stack to bond the first conductive foil, the magnetic sheet, and the second conductive foil together.

In this embodiment, the adhesive resin may be a thermosetting resin, and the adhesive resin bonds the first conductive foil, the magnetic sheet, and the second conductive foil together when curing in the step of applying heat and pressure to the stack.

Further, in this embodiment, the first conductive foil has a first primer layer formed on one side thereof, and the second conductive foil has a second primer layer formed on one side thereof, the magnetic sheet, and the first A conductive foil is stacked so that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil, and a magnetic sheet and a second conductive foil are stacked so that the other side of the magnetic sheet is in contact with the second The second primer layer of the conductive foil is in contact.

A method for manufacturing a conductive magnetic composite sheet according to a preferred embodiment includes the following steps: manufacturing a magnetic sheet including magnetic powder and a thermosetting adhesive resin; stacking the magnetic sheet and the first conductive foil; and applying heat and pressure to the obtained Stacked to adhere the magnetic sheet to the first conductive foil by curing of the adhesive resin.

A method of manufacturing a conductive magnetic composite sheet according to another preferred embodiment includes the following steps: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking a first conductive foil, a magnetic sheet, and a second conductive foil; And pressure is applied to the obtained stack to bond the first conductive foil, the magnetic sheet, and the second conductive foil together by curing of the adhesive resin.

A method for manufacturing a conductive magnetic composite sheet according to another preferred embodiment includes the following steps: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; 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 obtained stack to bond the magnetic sheet to the first conductive Foil.

A method for manufacturing a conductive magnetic composite sheet according to another preferred embodiment includes the following steps: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; forming a first primer layer on one side of the first conductive foil; The second primer layer is formed on one side of the second conductive foil; the magnetic sheet and the first conductive foil are stacked so that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil; the stacked magnetic Sheet and second conductive foil such that the other side of the magnetic sheet is in contact with the second primer layer of the second conductive foil; and applying heat and pressure to the obtained stack to place the first conductive foil, magnetic sheet And a second conductive foil.

The magnetic sheet used in the method may have substantially the same composition and properties as the magnetic sheet according to the embodiment described above, and may also be manufactured by a substantially same method.

Specifically, the magnetic sheet may include 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of a polyurethane-based resin, 0.5% to 2% by weight Isocyanate-based hardener, and 0.3 to 1.5% by weight of epoxy-based resins as the binder resin. As a specific example, the polyurethane-based resin includes a repeating unit represented by Formulas 2a and 2b, the isocyanate-based hardener may be an alicyclic diisocyanate, and the epoxy-based resin may be bisphenol A-type epoxy resin, cresol novolac-type epoxy resin, or a (glycidyloxyphenyl) ethane-type epoxy resin.

The magnetic sheet may be an unsintered sheet having flexibility and a thickness of 10 μm to 3,000 μm.

In addition, the magnetic sheet may have a magnetic permeability of 100 to 300 based on an alternating current having a frequency of 3 MHz, a magnetic permeability of 80 to 270 based on an alternating current having a frequency of 6.78 MHz, and a magnetic permeability based on an alternating current having a frequency of 13.56 MHz Permeability of 60 to 250.

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

According to a preferred embodiment, as illustrated in FIG. 4, at the same time as the curing of the adhesive resin is completed, the first conductive foil 210 and the second conductive foil 220 may be bonded to the magnetic sheet 100. Since the first conductive foil 210 and the second conductive foil 220 are bonded to the magnetic sheet 100 by thermal curing, the adhesion strength between the magnetic sheet and the conductive foil can be excellent. In particular, since the magnetic sheet and the conductive foil are bonded together when the adhesive resin is cured at the same time as the pressure 700, the bonding strength can be better. Therefore, the conductive foil can be easily adhered to the magnetic sheet without a separate adhesive layer.

According to another preferred embodiment, the conductive foil may have a primer layer formed on one side thereof, and the dry magnetic sheet and the conductive foil are stacked so that one side of the dry magnetic sheet is on the primer with the conductive foil. Layer contact.

The primer layer may 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-based resin.

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

The thickness of the primer layer may be in a range of about 0.01 μm to about 10 μm, about 0.01 μm to about 5 μm, or about 0.01 μm to about 1 μm. In addition, the thickness of the primer layer may be in a range of about 0.1 μm to 10 μm, or about 1 μm to 5 μm.

Specifically, the first primer layer (and the second primer layer) includes a thermosetting resin, and the thermosetting resin in the first primer layer (and the second primer layer) may be subjected to a step of applying heat and pressure to the stack. Medium curing. In addition, the binder resin includes a thermosetting resin, and the thermosetting resin in the binder resin may be cured in a step of applying heat and pressure to the stack.

Therefore, simultaneously with the completion of the curing of the magnetic sheet and the primer layer, the first conductive foil and the second conductive foil may be bonded to the magnetic sheet. Since the first conductive foil and the second conductive foil are bonded to the magnetic sheet through the thermally cured first primer layer and the second primer layer, the adhesion strength between the magnetic sheet and the conductive foil can be excellent . In particular, since the magnetic sheet and the conductive foil are bonded together when the primer layer is cured while being pressed, the bonding strength can be better.

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

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

As illustrated in FIG. 5, the steps of applying heat and pressure may 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 stacked on one or both sides of the uncured dry magnetic sheet 101 in which the adhesive resin is cured, and pass through the roller 600. In this case, because the roller itself is heated, the roller can apply both heat and pressure to the stack. That is, the magnetic sheet and the conductive foil are continuously laminated by a roller. Therefore, the magnetic sheet 100 in which the adhesive resin is cured is formed, and at the same time, the first conductive foil 210 and the second conductive foil 220 can be bonded to the magnetic sheet 100.

In the roll-to-roll process, the temperature of the roll can be in the range of about 100 ° C to about 300 ° C. In addition, the pressure of the roller may be in a range of about 1 MPa to about 100 MPa. In addition, about 1 to 20 pairs of rollers can be used in the roll-to-roll process. In addition, the stacking speed can 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, and in this case, the roll-to-roll process can be performed by using 2 to 10 pairs of rolls at 150 ° C to 200 ° C It is performed at a temperature, a roll pressure of 5 MPa to 30 MPa, and a speed of 1 m / min to 5 m / min.

As illustrated in FIG. 6, the steps of applying heat and pressure may be performed by a batch process. In particular, the dry magnetic sheet and the conductive foil are stacked, and the stack thus formed is stacked again in a plurality of stages. Thereafter, thermal treatment is performed in a state where pressure is applied to the magnetic sheet and the conductive foil stacked in a plurality of stages. Therefore, the adhesive resin and the adhesive resin of the magnetic sheet are cured, and a stack 10 in which the first conductive foil 210 and the second conductive foil 220 are adhered to the magnetic sheet 100 through the cured adhesive resin can be obtained.

In the above batch process, the heat treatment temperature may be in a range of about 100 ° C to about 300 ° C. In addition, a pressure applied to a stack stacked in a plurality of stages may be in a range of about 1 MPa to about 100 MPa. In addition, the length of time for which heat and pressure is applied may be in the range of about 0.1 hours to about 5 hours.

According to an embodiment, as illustrated 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 second primer layer 321 is formed on On one side of the second conductive foil 220. Thereafter, the first conductive foil 210 and the second conductive foil 220 are stacked to allow the first primer layer 311 and the second primer layer 321 to be in contact with one side and the other side of the dry magnetic sheet 101, respectively.

Thereafter, as illustrated in FIG. 8, the dry magnetic sheet, the primer layer, and the conductive foil are laminated by heat and pressure 700. Therefore, the dry magnetic sheet and the conductive foil can be laminated via a primer. Under this condition, lamination can be performed under heat and pressure conditions, and in particular, can be performed by the roll-to-roll process or batch process described above under the previously mentioned temperature and pressure conditions.

Therefore, the magnetic sheet 100 in which the curing of the binder resin is completed by heat in the lamination process can be formed. In addition, since the primer layer is cured during lamination, the magnetic sheet and the conductive foil can be bonded together by the cured primer layer. That is, the cured primer layer can serve as an adhesive layer that is configured to adhere a magnetic sheet to a conductive foil. Therefore, a conductive magnetic composite sheet in which the magnetic sheet 100 and the first conductive foil 210 and the second conductive foil 220 are bonded via the cured first primer layer 310 and the second primer layer 320 can be obtained.

According to an example, because 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 high chemical resistance. Therefore, when the conductive foil is etched with an etchant, the first primer layer 310 and the second primer layer 320 can play a role in protecting 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 may have substantially the same composition and properties as the magnetic sheet according to the embodiment described above, and may also be manufactured by a substantially same method.

Therefore, the magnetic sheet may have a magnetic permeability of 100 to 300 based on an alternating current having a frequency of 3 MHz, a magnetic permeability of 80 to 270 based on an alternating current having a frequency of 6.78 MHz, and a magnetic permeability based on an alternating current having a frequency of 13.56 MHz. Permeability of 60 to 250.

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

In addition, the magnetic sheet may be an unsintered cured sheet having flexibility and a thickness of 10 μm to 3,000 μm.

According to a specific example, the magnetic sheet may include 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of a polyurethane-based resin, and 0.5% to 2% by weight. % Of the isocyanate-based hardener and 0.3% to 1.5% by weight of the epoxy-based resin as the binder resin. In addition, in this state, the magnetic powder has a composition of Formula 1, the polyurethane-based resin includes a repeating unit represented by Formulas 2a and 2b, and the isocyanate-based hardener may be an alicyclic diisocyanate, and based on The epoxy resin may be a bisphenol A epoxy resin, a cresol novolac epoxy resin, or a (glycidyloxyphenyl) ethane epoxy resin.

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

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

The shape of the pattern of the antenna pattern according to an embodiment is not particularly limited, and for example, the pattern may be formed so that a near field communication (NFC) antenna, a wireless power charging (WPC) antenna, and a magnetic security transmission (MST) antenna can be achieved These functions have various functions, and the pattern shape can be changed differently if necessary. In addition, the antenna pattern may 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, and thus, the antenna pattern may be directly in contact with one or both sides of the magnetic sheet. In addition, the antenna pattern can be firmly adhered to the magnetic sheet by a primer layer.

According to a preferred embodiment, the antenna device includes: a magnetic sheet including magnetic powder and an adhesive resin; and a first antenna pattern directly adhered to one side of the magnetic sheet.

According to another preferred embodiment, the antenna device includes: a magnetic sheet including magnetic powder and an adhesive resin; a first antenna pattern directly adhered to one side of the magnetic sheet; and a second antenna pattern directly adhered to The other side of the magnetic sheet.

According to another preferred embodiment, the antenna device includes: a magnetic sheet including a magnetic powder and an adhesive resin; a first antenna pattern provided on one side of the magnetic sheet; and a first primer layer provided on the magnetic And the first antenna pattern to adhere the magnetic sheet and the first antenna pattern together.

According to another preferred embodiment, the antenna device includes: a magnetic sheet including a magnetic powder and an adhesive resin; a first antenna pattern provided on one side of the magnetic sheet; and a second antenna pattern provided on the magnetic sheet On the other side; a first primer layer provided between the magnetic sheet and the first antenna pattern to bond the magnetic sheet and the first antenna pattern together; and a second primer layer provided The magnetic sheet and the second antenna pattern are adhered together between the magnetic sheet and the second antenna pattern.

The antenna device may further include a passage through the magnetic sheet.

Therefore, the antenna device may include a magnetic sheet; an antenna pattern disposed on one or both sides of the magnetic sheet; and at least one path penetrating the magnetic sheet and connected to the antenna pattern.

The via is in contact with two antenna patterns provided on both sides of the magnetic sheet to electrically connect the antenna patterns to each other. The pathway may include a conductive material. For example, the via may include at least one metal selected from the group consisting of copper, nickel, gold, silver, zinc, and tin.

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

In this case, the inner wall of the first via hole is plated, the first via hole is filled with a conductive material, or solder or a conductive strip is inserted into the first via hole, and therefore, the first via hole may constitute the first path. For example, the magnetic sheet includes a first via hole penetrating the magnetic sheet vertically, and in this case, the inner wall of the first via hole may be plated to form the first via.

The antenna device according to the embodiment may have various configurations including the shape of the antenna pattern, the path and the connection of the terminal, or additional wiring.

According to an embodiment, the antenna pattern includes a first antenna pattern provided on one side of the magnetic sheet, the antenna device further includes a wiring pattern provided on the other side of the magnetic sheet, and the path includes a penetrating magnetic sheet and is connected to A first via at one end of the first antenna pattern and one end of the wiring pattern.

According to another embodiment, the antenna pattern is composed of: a plurality of first conductive line patterns, which are disposed on one side of the magnetic sheet in parallel and spaced apart from each other; and a plurality of second conductive line patterns, which The first conductive line pattern and the second conductive line pattern have the same elongation direction and are arranged on the other side of the magnetic sheet in parallel and spaced apart from each other. The magnetic sheet penetrates and connects the first conductive line pattern and the second conductive line pattern.

Hereinafter, a specific embodiment of the antenna device will be exemplarily described.

According to a specific embodiment, referring to FIG. 9, the antenna device includes a magnetic sheet 100; a first antenna pattern 230 provided on one side of the magnetic sheet; a wiring pattern 240 provided on the other side of the magnetic sheet; and A wiring pattern for bonding the magnetic sheet and the first antenna pattern together; and a first via 251 that penetrates the magnetic sheet 100, and in this case, the first via 251 is connected to the first antenna pattern One end of 230 and one end of the wiring pattern 240.

The antenna device according to a specific embodiment may further include a first terminal pattern and a second terminal pattern on one side or the other side of the magnetic sheet 100, and may further include a second path 252 that penetrates the magnetic field. Chip 100, and various antenna devices can be designed according to the position and connection configuration of these components.

10A to 10C are plan views of antenna devices according to various configuration examples (the part shown in black in the pattern is the front pattern, the hatched part is the rear pattern, and the part indicated as a circle is a path).

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, the antenna device according to a specific embodiment further includes a first terminal pattern 271 provided on one side of the magnetic sheet 100; and a second path 252 penetrating the magnetic sheet 100, and in this condition, The second via 252 may be connected to the other end of the first terminal pattern 271 and the wiring pattern 240. In this case, the antenna device may further include a second terminal pattern 272 provided on one side of the magnetic sheet 100, and in this case, the other end of the first antenna pattern 230 may be connected to the second terminal. Pattern 272. In addition, in this situation, the first terminal pattern 271 and the second terminal pattern 272 may be disposed adjacent to each other.

In addition, 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 connected to another of the wiring pattern 240. One end. In this case, the antenna device may further include a second terminal pattern 272 provided on the other side of the magnetic sheet 100; and a second path 252 penetrating the magnetic sheet 100, and the second path 252 may be connected to the second The other end of the terminal pattern 272 and the first antenna pattern 230. In addition, in this situation, the first terminal pattern 271 and the second terminal pattern 272 may be disposed adjacent to each other.

In addition, 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 connected to another of the wiring pattern 240. One end. In this case, in another configuration example, the antenna device may further include a second terminal pattern 272 provided on one side of the magnetic sheet 100, and the second terminal pattern 272 may be connected to the first antenna pattern The other end of 230.

In the 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 may be adhered to one side of the magnetic sheet, and the wiring pattern may be adhered to the other of the magnetic sheet. One side.

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

In the antenna device according to a specific embodiment, since the first antenna pattern and the wiring pattern are respectively disposed on different sides of the magnetic sheet and connected through a path penetrating the magnetic sheet, no additional process is required, such as to prevent a short circuit The wiring is bundled, and therefore, process efficiency can be improved. In addition, since the antenna device according to the embodiment can prevent an increase in thickness due to the wiring fabric for insulation, the film properties of the antenna device can be further improved.

According to another specific embodiment, the antenna device includes a magnetic sheet; a plurality of first conductive line patterns disposed on one side of the magnetic sheet spaced apart from each other in parallel; a plurality of second conductive line patterns spaced from each other And spaced in parallel on the other side of the magnetic sheet; and a plurality of passages provided to penetrate the magnetic sheet, and in this case, the elongation of the first conductive line pattern and the second conductive line pattern is The same, and the vias connect the first conductive line pattern and the second conductive line pattern.

In particular, since the vias are alternately connected to the first conductive line pattern and the second conductive line pattern which are arranged in parallel and spaced apart from each other, any one end and the other end of the first conductive line pattern may be connected respectively. To the two second conductive line patterns adjacent to each other, and any one end and the other end of the second conductive line pattern may be respectively connected to the two first conductive line patterns adjacent to each other.

In addition, when the magnetic sheet is divided into a core region and a surrounding region around the core region, two ends of the first conductive line pattern and the second conductive line pattern are disposed in the surrounding region, and at the same time, the first conductive line pattern and The second conductive line pattern crosses the magnetic core region, and the via is disposed in the surrounding area to be able to connect the ends of the first conductive line pattern and 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 surrounding the magnetic core region.

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 may be divided into a core region CR and a peripheral region OR adjacent to the core region.

The magnetic core region is provided in a central portion of the magnetic sheet. The magnetic core region may have a shape elongated in one direction.

The surrounding area is set around the magnetic area. The peripheral region may have a shape elongated in the same direction as the magnetic core region. The surrounding area may be provided on both sides of the magnetic core area.

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

The first conductive line pattern may extend in a direction crossing the extending direction of the magnetic core region. In particular, the first conductive line pattern may extend to cross the magnetic core region. The first conductive line pattern may extend from a peripheral region provided on one side of the magnetic core region to a peripheral region provided on the other side of the magnetic core region.

The first conductive line pattern may extend side by side. In addition, 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 adhered to the other side of the magnetic sheet.

The second conductive line pattern may extend in a direction crossing the extending direction of the magnetic core region. In particular, the second conductive line pattern may extend to cross the magnetic core region. The second conductive line pattern may extend from a peripheral region provided on one side of the magnetic core region to a peripheral region provided on the other side of the magnetic core region.

The second conductive line pattern may extend side by side. In addition, the second conductive line patterns may be spaced apart from each other.

The path penetrates the magnetic sheet. The via connects 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 alternately connect 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 sequentially connected.

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

Therefore, when an alternating current passes through the first conductive line pattern, the second conductive line pattern, and the path, an electromagnetic signal may be formed through both ends of the core region.

As a preferred example, the magnetic sheet can be formed thinly and the electromagnetic signal can be formed at both ends of the core region with a high magnetic flux density. Therefore, the antenna device according to the embodiment can have improved receiving sensitivity, and can easily transmit and receive electromagnetic signals even in a narrow gap.

A method of manufacturing an antenna device according to an embodiment includes the steps of: bonding the magnetic sheet and the conductive foil together by applying heat and pressure to the magnetic sheet and the conductive foil; and etching the conductive foil to conduct the conductive An antenna pattern is formed in the flexible foil.

According to a preferred embodiment, a method of manufacturing an antenna device includes the following steps: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking a magnetic sheet and a first conductive foil; applying heat and pressure to the obtained stack to bond the magnetic sheet To the first conductive foil; and etching the first conductive foil to form a first antenna pattern in the first conductive foil.

According to another preferred embodiment, a method of manufacturing an antenna device includes the steps of: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; stacking a first conductive foil, a magnetic sheet, and a second conductive foil; and applying heat and pressure To the obtained stack to bond the first conductive foil, the magnetic sheet, and the second conductive foil together; and etching the first conductive foil and the second conductive foil to the first conductive foil and the second conductive foil, respectively A first antenna pattern and a second antenna pattern are formed in the conductive foil.

According to another preferred embodiment, a method of manufacturing an antenna device includes the following steps: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; forming a first primer layer on one side of a first conductive foil; stacking the magnetic sheet and A first conductive foil such that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil; applying heat and pressure to the obtained stack to adhere the magnetic sheet to the first conductive foil; and etching The first conductive foil forms a first antenna pattern in the first conductive foil.

According to another preferred embodiment, a method for manufacturing an antenna device includes the following steps: manufacturing a magnetic sheet including magnetic powder and an adhesive resin; forming a first primer layer on one side of a first conductive foil; and forming a second primer The lacquer layer is formed on one side of the second conductive foil; the magnetic sheet and the first conductive foil are stacked so that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil; the magnetic sheet and the first conductive foil are stacked; Two conductive foils so that the other side of the magnetic sheet is in contact with the second primer layer of the second conductive foil; heat and pressure are applied to the obtained stack to place the first conductive foil, the magnetic sheet, and the second conductive The conductive foils are bonded together; and the first conductive foil and the second conductive foil are etched to form a first antenna pattern and a second antenna pattern in the first conductive foil and the second conductive foil, respectively.

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

As a specific example, the magnetic sheet may include 70% to 90% by weight of magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of a polyurethane-based resin, 0.5% to 2% by weight. % Of the isocyanate-based hardener and 0.3% to 1.5% by weight of the epoxy-based resin as the binder resin. In addition, in this state, the magnetic powder has a composition of Formula 1, the polyurethane-based resin includes a repeating unit represented by Formulas 2a and 2b, and the isocyanate-based hardener may be an alicyclic diisocyanate, and based on The epoxy resin may be a bisphenol A epoxy resin, a cresol novolac epoxy resin, or a (glycidyloxyphenyl) ethane epoxy resin.

In addition, the magnetic sheet can be manufactured by substantially the same conditions and methods as the method described above for manufacturing the magnetic sheet according to the embodiment.

Specifically, the magnetic sheet can be manufactured by a method including the following steps: (a) mixing a polyurethane-based resin, an isocyanate-based hardener, and an epoxy-based resin to manufacture a binder resin; b) mixing magnetic powder and an organic solvent with a binder resin to produce a slurry; and (c) molding the slurry into a compact form and a dry sheet.

The conductive magnetic composite sheet is manufactured by applying heat and pressure, and the specific process conditions and methods are the same as the manufacturing method of the conductive magnetic composite sheet described above.

In the etching step, the mask pattern is formed on the conductive foil using a photoresist, and the conductive foil is etched using the mask pattern to be patterned. Etching may be performed by using a typical etchant such as an aqueous acid solution, and in this case, because the magnetic sheet is protected by a primer layer, there may be a very small thickness or a reduction in magnetic permeability by the etchant. In addition, even if the etchant penetrates into the magnetic sheet, there is little reduction in thickness or magnetic permeability due to the excellent chemical resistance of the magnetic sheet.

Preferably, the application of 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 by using an aqueous acid solution.

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

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

First, as illustrated in FIG. 12A, a plurality of via holes 260 are formed on 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 via hole may have a diameter of, for example, 100 μm to 300 μm, or 120 μm to 170 μm.

Thereafter, as illustrated in FIG. 12B, the via 250 may be formed by forming a plating layer on the inner surface of the via hole 260. In the case where the via is formed by a plating process, a via formed in a large area can be immediately formed. That is, in the case where the via is formed as a plating layer, the via can be easily and efficiently formed. In addition, the via may be formed by filling the via hole with a conductive powder and then sintering the conductive powder. In addition, vias can be formed by inserting solder or conductive strips into the via holes.

Thereafter, the mask pattern is formed by a process such as a photoresist process for covering the first conductive foil 210 and the second conductive foil 220, and as illustrated in FIG. 12C, the first conductive foil 210 is masked by The mask pattern is selectively etched to form a first antenna pattern 230.

In this state, the adhesive resin of the magnetic sheet is closely attached to the antenna pattern. That is, the adhesive resin of the magnetic sheet is adhered to the antenna pattern by a thermal curing process. Therefore, in the etching process, the etchant does not penetrate between the magnetic sheet and the antenna pattern. Therefore, the antenna pattern can be adhered to the magnetic sheet with improved adhesive strength. Therefore, the thickness can be reduced and the manufacturing process can be simplified by forming a conductive foil or antenna pattern directly on the magnetic sheet without an insulating substrate such as polyimide.

In addition, under the condition that the magnetic sheet and the conductive foil are firmly adhered to each other by thermal curing of the primer layer, the first antenna pattern formed by the etching process can also be adhered to the magnetic sheet with improved adhesive strength. Therefore, regarding the antenna device according to the embodiment, the adhesion strength between the magnetic sheet and the antenna pattern can be improved by the primer layer provided between the magnetic sheet and the antenna pattern, and the primer layer can protect the magnetic sheet from the external environment. influences.

In addition, the antenna device according to the embodiment has excellent magnetic properties, so the antenna device can be used in multiple applications such as NFC, WPC, and MST. In addition, since a polymeric magnetic sheet is used, the antenna device according to the embodiment can improve flexibility, and since the antenna device can be manufactured by a roll-to-roll process, processability can be improved.

In particular, in the magnetic sheet, because the adhesive resin is thermally cured to hold the magnetic powder more stably, even if the environment changes, for example, an etching process is performed for patterning, or a reflow or soldering process is performed to For the application of magnetic sheets to products, there can also be minimal weight and thickness changes.

A portable terminal according to an embodiment includes a housing and an antenna device disposed in the housing, wherein the housing includes an electromagnetic wave transmission area and an electromagnetic wave non-transmission area, the antenna device includes a magnetic sheet, and a plurality of first conductive line patterns, which are A plurality of second conductive line patterns are provided on the other side of the magnetic sheet in parallel and spaced apart from each other; and a plurality of passages that penetrate the magnetic sheet are provided in parallel and spaced apart from each other. The elongation directions of the first conductive line pattern and the second conductive line pattern are the same, and the electromagnetic wave transmission region is disposed in parallel with the first conductive line pattern and the second conductive line pattern.

Specifically, the magnetic sheet is divided into a magnetic core region and a surrounding region around the magnetic core region, and two ends of the first conductive line pattern and the second conductive line pattern are disposed in the surrounding region, while the first conductive line pattern and The second conductive line pattern crosses the magnetic core region, and the path is disposed in the surrounding region to connect the ends of the first conductive line pattern and the second conductive line pattern.

In addition, the first conductive line pattern, the second conductive line pattern, and the via may be connected to each other to form a coil surrounding the magnetic core region.

The antenna device generates an electromagnetic signal in a direction perpendicular to the elongation direction of the first conductive line pattern and the second conductive line pattern, and the electromagnetic signal is passed to the outside of the housing through the electromagnetic wave transmission area.

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

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

Since the conventional antenna device is manufactured by a method in which an antenna pattern is formed on an insulating substrate layer such as polyimide, and a magnetic sheet is added to the insulating substrate layer, even if a conductive line pattern is formed on both sides of the substrate layer Are connected alternately via vias, and electromagnetic signals are also blocked by magnetic sheets added to one side of the substrate layer. In contrast, regarding the antenna device according to the embodiment, since the magnetic sheet is used as a substrate layer to form conductive line patterns on both sides of the magnetic sheet and the conductive line patterns are alternately connected via a path to form a coil, the electromagnetic signals are Transmission is unobstructed and improved communication sensitivity can be obtained due to the excellent magnetic properties of the magnetic sheet. Examples

In the following, more specific examples will be exemplarily described.

The materials used in the following examples are as follows:-Aluminosilicate iron powder: CIF-02A, Crystallite Technology-Polyurethane resin: UD1357, Dainichiseika Color & Chemicals Mfg. Co. Ltd.-Isocyanate-based hardener: iso Furone diisocyanate, Sigma-Aldrich-epoxy-based resin: bisphenol A epoxy resin (epoxy equivalent = 189 g / eq), Epikote ^TM 828, Japan Epoxy Resin Example 1: Manufacturing steps of magnetic sheet 1) Manufacturing of magnetic powder slurry

42.8 parts by weight of aluminosilicon powder as magnetic powder, 15.4 parts by weight of polyurethane-based resin dispersion (25% by weight of polyurethane-based resin, 75% by weight of 2-butanone) 1.0 parts by weight of an isocyanate-based hardener dispersion (62% by weight of an isocyanate-based hardener, 25% by weight of n-butyl acetate, 13% by weight of 2-butanone), 0.4 parts by weight of an epoxy group Resin dispersion (70% by weight of epoxy-based resin, 3% by weight of n-butyl acetate, 15% by weight of 2-butanone, 13% by weight of toluene), and 40.5 parts by weight of toluene in a planetary system Mix in a mixer at a speed of about 40 rpm to about 50 rpm for about 2 hours to make a magnetic powder slurry. Step 2) Manufacturing of magnetic sheet

The magnetic powder slurry manufactured above was coated on a carrier film by a comma coater and dried at a temperature of about 110 ° C to manufacture a dry magnetic sheet. The final magnetic sheet was obtained by compressing and curing the dry magnetic sheet at a temperature of about 170 ° C. and a pressure of about 9 MPa using a hot pressing process for about 30 minutes. Example 2: Manufacturing of copper foil laminated magnetic composite sheet

One side of a copper foil having a thickness of about 37 μm was coated with an epoxy-based resin to form a primer layer having a thickness of about 4 μm. A copper foil was provided on both sides of the magnetic sheet obtained in Example 1, and a stack was formed so that a primer layer was provided between the magnetic sheet and the copper foil. Thereafter, the stack was compressed by a hot pressing process at a temperature of about 170 ° C. and a pressure of about 9 MPa for about 60 minutes to cure the primer layer, and thus, a copper foil laminated magnetic composite sheet was manufactured. Example 3: Manufacturing of antenna devices

A plurality of via holes having a diameter of about 0.15 mm were formed in the copper foil laminated magnetic composite sheet obtained in Example 2 using a drill. Thereafter, a copper plating layer is formed on the inner side of the via hole by a copper plating process. The plating layer serves as a via connecting the top surface and the bottom surface of the copper foil to each other. Thereafter, a mask pattern is formed on the top surface and the bottom surface of the copper foil laminated magnetic composite sheet, and a part of the copper foil is etched by an etching process. Therefore, an antenna device having an upper pattern and a lower pattern is obtained.

The magnetic sheet manufactured in Example 1, the copper foil laminated magnetic composite sheet manufactured in Example 2, and the antenna device manufactured in Example 3 were tested according to the following procedures. Experimental example 1. Permeability measurement

The magnetic permeability and magnetic loss of the magnetic sheet are measured by using an impedance analyzer. The results are summarized in Table 1 below. [Table 1]

As exemplified in Table 1, the magnetic sheet according to the embodiment has excellent magnetic permeability in all three frequency bands. Experimental example 2. Heat resistance measurement (reflow test)

Two reflow tests were performed under thermal processing conditions, in which the magnetic sheet, copper foil laminated magnetic composite sheet, and antenna device were placed in a furnace, and the temperature of the furnace was increased at a constant rate from 30 ° C to 240 ° C for 200 seconds. And then the temperature of the furnace was reduced at a constant rate from 240 ° C to 130 ° C for 100 seconds (see Figure 15). Thereafter, changes in thickness, magnetic permeability, and adhesive strength of each of the magnetic sheet, the copper foil laminated magnetic composite sheet, and the antenna device were measured.

Therefore, even after the reflow test was performed twice, no bubbles were observed on the entire surface of the magnetic sheet. In addition, after the reflow test was performed twice, changes in the thickness and permeability of the magnetic sheet were measured to be less than 5%, respectively. In addition, after the reflow test was performed twice, the peel strength measurement between the magnetic sheet and copper was measured to be 0.6 kgf / cm or more. Experimental example 3. Heat resistance measurement (Pb floating test)

The magnetic sheet and the copper foil laminated magnetic composite sheet were floated in a molten lead bath and allowed to stand for 40 seconds, and then the surfaces were observed. Therefore, no bubbles were observed on the entire surface of the magnetic sheet and the copper foil laminated magnetic composite sheet. Experimental example 4. Chemical resistance measurement

The magnetic sheet was immersed in a 2N HCl aqueous solution for about 30 minutes, and then changes in the mass, thickness, and permeability of the magnetic sheet were measured. In addition, the magnetic sheet was immersed in a 2N NaOH aqueous solution for about 30 minutes, and then changes in the mass, thickness, and permeability of the magnetic sheet were measured. Therefore, precipitation of magnetic powder does not occur at the bottom of the solution, and changes in the mass, thickness, and permeability of the magnetic sheet are measured as 5% or less, respectively. Experimental example 5. Measurement of rust resistance

According to the salt spray test based on KS D9502, neutral NaCl brine having a concentration of 5% was sprayed on the magnetic sheet at an average rate of 1 ml / hour to 2 ml / hour at 35 ° C for 72 hours, and then the rusty occur. As a result of measuring the occurrence of rust by the area method (rated number method), a rated number of 9.8 or more was measured (the rated number method is an evaluation method of the degree of corrosion indicated by the ratio of the corrosion area to the effective area). , Where the degree of corrosion is rated on a scale from 0 to 10). Experimental example 6. Peel strength measurement

The peel strength between the magnetic sheet of the copper foil laminated magnetic composite sheet and the copper foil was measured using a universal testing machine (UTM). Therefore, a peel strength of 0.6 kgf / cm or more is measured. Experimental example 7. Adhesive strength measurement (cross cutting test)

The cross-cut test (ASTM D3369) was used to measure the bonding strength between the magnetic sheet of the copper foil laminated magnetic composite sheet and the copper foil. As a result of the cross-cut test, the adhesive strength of 0/100 to 5/100 was measured. Experimental example 8. High temperature resistance and high humidity measurement

The magnetic sheet was left to stand in a constant temperature and humidity furnace at 85 ° C / 85% RH for 72 hours, and then the thickness and magnetic permeability changes of the magnetic sheet were measured. Therefore, changes in the thickness and magnetic permeability of the magnetic sheet were measured as 5% or less, respectively. Example 4: Manufacturing of magnetic sheet

A magnetic sheet was manufactured by repeating the procedures of steps (1) and (2) of Example 1, but by using an organic-coated alumino-silicon iron powder as the magnetic powder in step (1). Experimental example 9. Measurement of breakdown voltage

The electrodes were mounted on both sides of each of the magnetic sheets obtained in Examples 1 and 4, and the breakdown voltage was measured by applying a voltage while gradually increasing the voltage.

Therefore, 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. Insulation quality test

A copper foil laminated magnetic composite sheet was manufactured in the same manner as in Example 2 by using the magnetic sheet obtained in Example 4. Thereafter, two via holes having a diameter of 400 μm were formed in the copper foil laminated magnetic composite sheet, and copper plating was performed on the inside of the via holes in the same manner as in Example 3. In addition, the upper pattern and the lower pattern were formed by etching the copper foil in the same manner as in Example 3, but the two via holes were not allowed to be connected to the pattern. Thereafter, when a current flows through the two via holes, the resistance between the two via holes is measured.

In this case, the resistance was measured when the interval between the two via holes was changed to 500 μm, 700 μm, 900 μm, 1,100 μm, 1,400 μm, 2,400 μm, 4,400 μm, 6,400 μm, and 8,400 μm. .

In addition, the resistance was measured after the polyimide layer and the adhesive layer were further inserted between the copper foil and the magnetic sheet to make a composite sheet, and two via holes at different intervals were formed in the manner described above.

Therefore, the magnetic sheet of the embodiment has infinite resistance values for all spaces between via holes and the configuration of the composite sheet.

CR‧‧‧Core Area

OR‧‧‧ Surrounding area

10‧‧‧ stacked

20, 20'‧‧‧ Antenna device

30'‧‧‧ metal case

30‧‧‧ shell

31‧‧‧ electromagnetic wave non-transmission area

32‧‧‧ electromagnetic wave transmission area

40‧‧‧ external terminal

40'‧‧‧ external terminal

50, 50'‧‧‧ electromagnetic signal

100‧‧‧Magnetic sheet / Dry magnetic sheet

101‧‧‧ dry magnetic sheet

110‧‧‧ Magnetic Powder

120, 121‧‧‧ Adhesive resin

210‧‧‧The first conductive foil

220‧‧‧Second conductive foil

230‧‧‧First antenna pattern

231‧‧‧The first conductive line pattern

232‧‧‧Second conductive line pattern

240‧‧‧wiring pattern

250‧‧‧ access

251‧‧‧First Access

252‧‧‧Second Access

260‧‧‧via hole

271‧‧‧The first terminal pattern

272‧‧‧second terminal pattern

310, 311‧‧‧ the first primer layer

320, 321‧‧‧Second primer layer

400‧‧‧ carrier film

500‧‧‧coating machine

600‧‧‧ roller

700‧‧‧ heat and pressure / pressurization

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

Claims (18)

A method of manufacturing a conductive magnetic composite sheet, the method comprising: manufacturing a magnetic sheet including a magnetic powder and a binder resin; stacking the magnetic sheet and a first conductive foil; and applying heat and pressure to the obtained Stack to bond the magnetic sheet and the first conductive foil, and (i) wherein the conductive magnetic composite sheet has between the magnetic sheet and the first conductive foil after being subjected to two heat treatments One peel strength of 0.6kgf / cm to 20kgf / cm, the heat treatment consists of heating at a constant rate from 30 ° C to 240 ° C for 200 seconds and then cooling at a constant rate from 240 ° C to 130 ° C for 100 seconds; ( ii) After the heat treatment is repeated twice under the above conditions, the rate of change (decrease rate) in peel strength of the conductive magnetic composite sheet between the magnetic sheet and the first conductive foil is 10% or less And (iii) wherein 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 6 based on alternating current with one of the frequencies of 13.56MHz One of 0 to 250 permeability. The method of claim 1, wherein the step of applying heat and pressure to the stack is performed at a pressure of 5 MPa to 30 MPa and a temperature of 150 ° C to 200 ° C. As in the method of claim 1, the stacking step and the step of applying heat and pressure to the stack are performed by a roll-to-roll process by using 2 to 10 pairs of rollers at 150 ° C to 200 It is performed at a roller temperature of ℃, a roller pressure of 5 MPa to 30 MPa, and a speed of 1 m / min to 5 m / min. The method of claim 1, wherein the magnetic sheet is an unsintered sheet having flexibility and having a thickness of one of 10 μm to 3,000 μm. The method of claim 1, wherein the magnetic sheet contains 70% to 90% by weight of the magnetic powder based on the total weight of the magnetic sheet, and 6% to 12% by weight of a polyurethane-based resin, As the binder resin, 0.5 to 2% by weight of an isocyanate-based hardener and 0.3 to 1.5% by weight of an epoxy-based resin are used. The method of claim 1, wherein the adhesive resin is a thermosetting resin, and the adhesive resin bonds the magnetic sheet to the first conductive foil when cured in the step of applying heat and pressure to the stack. The method of claim 6, wherein the magnetic sheet is an unsintered sheet having a thickness of 10 μm to 3,000 μm having flexibility, and the magnetic sheet has 5% or Less one thickness change and 5% or less magnetic permeability change, the heat treatment consists of heating from 30 ° C to 240 ° C at a constant rate for 200 seconds and then cooling from 240 ° C to 130 at a constant rate ℃ for 100 seconds; the magnetic sheet has a thickness change of 5% or less and a permeability change of 5% or less when immersed in a 2N hydrochloric acid solution for 30 minutes; and immersion in a 2N sodium hydroxide solution At 30 minutes, the thickness of 5% or less changes and the permeability of 5% or less changes. The method of claim 1, wherein the first conductive foil has a first primer layer formed on one side thereof, and the magnetic sheet and the first conductive foil are stacked so that one side of the magnetic sheet is in It is in contact with the first primer layer of the first conductive foil. The method of claim 8, wherein the first primer layer includes a thermosetting resin, and the thermosetting resin in the first primer layer is cured in the step of applying heat and pressure to the stack. The method of claim 9, wherein the thermosetting resin comprises a bisphenol A type epoxy resin, a cresol novolac type epoxy resin, or a (glycidyloxyphenyl) ethane type epoxy resin. The method of claim 8, wherein the first primer layer has a thickness of 0.01 μm to 1 μm. A method of manufacturing a conductive magnetic composite sheet, the method comprising: manufacturing a magnetic sheet including a magnetic powder and a binder resin; stacking a first conductive foil, the magnetic sheet and a second conductive foil; and Heat and pressure are applied to the obtained stack to bond the first conductive foil, the magnetic sheet and the second conductive foil together, and (i) wherein the conductive magnetic composite sheet has been subjected to two heat treatments After the peel strength between 0.6kgf / cm and 20kgf / cm between the magnetic sheet and the first conductive foil, the heat treatment consists of heating from 30 ° C to 240 ° C at a constant rate for 200 seconds It is then cooled at a constant rate from 240 ° C to 130 ° C for 100 seconds; (ii) wherein after the heat treatment is repeated twice under the above conditions, the conductive magnetic composite sheet is between the magnetic sheet and the first conductive foil The rate of change (penetration rate) of peel strength between is 10% or less, and (iii) where the magnetic sheet has a magnetic permeability of 100 to 300 based on an alternating current having a frequency of Permeance of 80 to 270 of alternating current at one frequency Rate, and a permeability of 60 to 250 based on alternating current with a frequency of 13.56 MHz. The method of claim 12, wherein the adhesive resin is a thermosetting resin, and the adhesive resin is cured by applying heat and pressure to the stack in the step of curing the first conductive foil, the magnetic sheet, and the The second conductive foil is glued together. The method of claim 12, wherein the first conductive foil has a first primer layer formed on one side thereof, and the second conductive foil has a second primer layer formed on one side thereof, The magnetic sheet and the first conductive foil are stacked so that one side of the magnetic sheet is in contact with the first primer layer of the first conductive foil, the magnetic sheet and the second conductive foil are stacked, The other side of the magnetic sheet is in contact with the second primer layer of the second conductive foil, the first primer layer and the second primer layer include a thermosetting resin, and the first primer layer And the thermosetting resin in the second primer layer is cured in the step of applying heat and pressure to the stack. A method of manufacturing an antenna device, the method comprising: manufacturing a magnetic sheet including a magnetic powder and a binder resin; stacking the magnetic sheet and a first conductive foil; applying heat and pressure to the obtained stack to bond The magnetic sheet and the first conductive foil to form a conductive magnetic composite sheet; and etching the first conductive foil to form an antenna pattern in the first conductive foil, and (i) wherein the conductive magnetic The composite sheet has a peel strength between 0.6kgf / cm and 20kgf / cm between the magnetic sheet and the first conductive foil after being subjected to two heat treatments, the heat treatment constitutes a constant rate from 30 Heating to 240 ° C for 200 seconds and then cooling from 240 ° C to 130 ° C for 100 seconds at a constant rate; (ii) wherein after the heat treatment is repeated twice under the above conditions, the conductive magnetic composite sheet is in the The rate of change (decrease rate) of peel strength between the magnetic sheet and the first conductive foil is 10% or less, and (iii) wherein the magnetic sheet has a frequency of 100 to 300 based on an alternating current having a frequency of 3 MHz One magnetic permeability, based on the Permeability of 27,080 to one of one of the frequencies of the alternating current, and based on one of the one having a magnetic permeability of the alternating current to one of the 13.56MHz frequency 25,060. The method of claim 15, wherein the adhesive resin is a thermosetting resin, and the adhesive resin bonds the magnetic sheet and the first conductive foil when cured in the step of applying heat and pressure to the stack. The method of claim 15, wherein the first conductive foil has a first primer layer formed on one side thereof, the magnetic sheet and the first conductive foil are stacked so that one side of the magnetic sheet is in In contact with the first primer layer of the first conductive foil, the first primer layer includes a thermosetting resin, and the thermosetting resin in the first primer layer is applying heat and pressure to the stack of the In the process of curing. The method according to claim 15, wherein the magnetic sheet is a flexible green sheet having a thickness of one of 10 μm to 3,000 μm, and the magnetic sheet has 5% or less after being subjected to two heat treatments A change in thickness and a change in permeability of 5% or less, the heat treatment consists of heating from 30 ° C to 240 ° C for 200 seconds at a constant rate and then cooling from 240 ° C to 130 ° C for 100 at a constant rate Second; the magnetic sheet has a thickness change of 5% or less and a permeability change of 5% or less when immersed in a 2N hydrochloric acid solution for 30 minutes; and 30 minutes of immersion in a 2N sodium hydroxide solution One of 5% or less changes in thickness and one of 5% or less changes in permeability.