JP6679534B2 - Antenna device and portable terminal having antenna device - Google Patents

Description

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

  Recently, antennas for realizing functions such as near field communication (NFC), wireless power charging (WPC), and magnetic protection transmission (MST) have been used in mobile devices such as mobile phones, tablet PCs, and notebook PCs. It is installed inside. However, when another metal component is present in the mobile device and an AC magnetic field formed in the mobile device is applied to the metal component, an eddy current is generated, which reduces the performance of the antenna and reduces the recognition distance. Be brought.

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

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

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

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

  In addition, typical antenna devices produce an electromagnetic signal that can be transmitted to and received from external terminals by forming a coiled antenna pattern on one side of the insulating substrate layer. However, as shown in FIG. 16, in such an antenna device 20 ′, the transmission of the electromagnetic signal 50 ′ to the external terminal 40 ′ is blocked by the electromagnetic wave shielding material such as the metal case 30 ′, which is typical. It is difficult to apply the antenna device device 20 'to a portable terminal having a metal case. In addition, it has been attempted to provide an electromagnetic wave transmission region in order to solve the above problems, but in order to enable effective signal transmission / reception in consideration of the electromagnetic signal transmission characteristics of typical antenna devices. The area of the transmissive region needs to be significantly increased.

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

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

  In the above embodiment, the antenna pattern has a first antenna pattern arranged on one side of the magnetic sheet, and the antenna device further has a wiring pattern arranged on the other side of the magnetic sheet. And the via may have a first via penetrating the magnetic sheet and connected to one end of the first antenna pattern and one end of the wiring pattern.

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

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

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

  According to a specific embodiment, the antenna pattern and the wiring pattern are respectively arranged on different surfaces of the magnetic sheet, and these patterns are connected via vias penetrating the magnetic sheet, thereby short-circuiting the single-sided antenna device. Since no additional process such as coating of wiring is required to prevent this, the process efficiency can be improved. Further, since the antenna device according to the present embodiment can prevent an increase in thickness associated with the coating of the insulating wiring, the thin characteristics of the antenna device can be further improved.

  According to another specific embodiment, the antenna device comprises a first conductive line pattern and a second conductive line pattern respectively arranged on different sides of the magnetic sheet, both ends of which have vias. The coils that surround the core region of the magnetic sheet can be formed because the coils are alternately connected to each other. Therefore, the electromagnetic signal can be effectively transmitted and received through the end portion of the core region of the magnetic sheet, so that the communication sensitivity of the antenna device can be improved.

  Furthermore, the portable terminal according to the present embodiment can send and receive electromagnetic signals in a narrow gap of the case by using the antenna device. Thereby, even if a case made of an electromagnetic signal shielding material such as metal is used, it is possible to effectively transmit and receive an electromagnetic signal to and from an external terminal through a narrow electromagnetic wave transmission region.

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

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

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

  Further, the magnetic sheet has 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 an alternating current having a frequency of 13.56 MHz. It may have a magnetic permeability of 60-250 based.

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

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

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

  Further, the magnetic sheet comprises a first via hole vertically penetrating the magnetic sheet, and an inner wall of the first via hole may be plated to form a first via.

  The magnetic sheet further comprises a first terminal pattern disposed on one side of the magnetic sheet; and a second via penetrating the magnetic sheet, the second via being provided at the other end of the first terminal pattern and the wiring pattern. Can be connected.

  Further, the magnetic sheet further comprises a second terminal pattern arranged on one side of the magnetic sheet, the second terminal pattern being connected to the other end of the first antenna pattern, The terminal patterns are arranged so as to be adjacent to each other.

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

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

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

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

  Further, when the magnetic sheet is divided into the core region and the peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are arranged in the peripheral region, while the first conductive line pattern and the first conductive line pattern Vias may be disposed in the peripheral region to connect the two conductive line patterns across the core region and to connect the ends of the first conductive line patterns to the ends of the second conductive line patterns.

  Also, 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 core region.

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

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

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

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

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

  In the description of the embodiments below, when referring to a layer, foil or sheet as "above" or "below" another layer, foil or sheet, the terms "above" and "below" mean "directly". Includes the meanings of both "direct" and "indirect". Further, the description of the upper and lower sides of each element shall be made based on the drawings. In the drawings, the size or space of each element is exaggerated for better understanding, and may not be obvious to those skilled in the art.

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

  The magnetic sheet 100 includes (or has or includes; magnetic powder 110 and a binder resin 120).

  That is, the magnetic sheet 100 may be a polymer sheet (PMS). Specifically, the magnetic sheet 100 may be a non-sintered hardened 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 includes magnetic powder 110.

  The magnetic powder is oxide magnetic powder such as ferrite (Ni-Zn system, Mg-Zn system, Mn-Zn system ferrite); metal magnetic powder such as permalloy, sendust, Fe-Si-Cr alloy, Fe-Si nanocrystals. Or a mixed powder of these. For example, the magnetic powder may be sendust powder having a Fe-Si-Al alloy composition.

式１において、Ｘはアルミニウム（Ａｌ）、クロム（Ｃｒ）、ニッケル（Ｎｉ）、銅（Ｃｕ）、又はこれらの組合せであり；
Ｙはマンガン（Ｍｎ）、ホウ素（Ｂ）、コバルト（Ｃｏ）、モリブデン（Ｍｏ）、又はこれらの組合せであり;並びに
０．０１≦ａ≦０．２、０．０１≦ｂ≦０．１および０≦ｃ≦０．０５である。 As a specific example, the magnetic powder may have a composition of Formula 1 below.

In Formula 1, X is aluminum (Al), chromium (Cr), nickel (Ni), copper (Cu), or a combination thereof;
Y is manganese (Mn), boron (B), cobalt (Co), molybdenum (Mo), or a combination thereof; and 0.01 ≦ a ≦ 0.2, 0.01 ≦ b ≦ 0.1 and 0 ≦ c ≦ 0.05.

  The particle size of the magnetic powder is in the range of about 3 nm to about 1 mm. For example, the particle size of the magnetic powder may range from about 1 μm to about 300 μm, 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 preferable range, sufficient magnetic properties can be obtained, and a short circuit when forming vias on the magnetic sheet can be suppressed.

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

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

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

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

  As the resin capable of being cured and exhibiting adhesiveness, a resin containing at least one thermosetting functional group or moiety such as a glycidyl group, an isocyanate group, a hydroxyl group, a carboxyl group, or an amide group; or an epoxide group, a cyclic ether group , At least one active energy curable functional group or moiety such as a sulfide group, an acetal group, or a lactone group may be used. Such functional groups or moieties can be, for example, isocyanate groups (-NCO), hydroxyl groups (-OH), or carboxyl groups (-COOH).

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

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

式２ａおよび２ｂにおいて、
Ｒ_１およびＲ_３はそれぞれ独立してＣ_１〜５アルキレン基、尿素基またはエーテル基であり；
Ｒ_２およびＲ_４はそれぞれ独立してＣ_１〜５アルキレン基であり；並びに
Ｃ_１〜５アルキレンの各々は、非置換である、またはハロゲン、シアノ、アミノ、およびニトロからなる群から選択される少なくとも１つの置換基で置換される。 The polyurethane-based resin may include repeating units represented by the following formulas 2a and 2b.

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

  The polyurethane resin may contain the repeating unit represented by the formula 2a and the repeating unit represented by the formula 2b in a molar ratio of 1:10 to 10: 1.

  The polyurethane-based resin can have a number average molecular weight 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. The isocyanate based curing agent can be an organic diisocyanate.

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

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

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

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

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

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

  The epoxy-based resin can have an epoxy equivalent weight of about 80 g / eq to about 1000 g / eq, or about 100 g / eq to about 300 g / eq. In addition, the epoxy resin may have a number average molecular weight of about 10,000 g / mol to 50,000 g / mol.

  Further, the magnetic sheet 100 may include a corrosion inhibitor. Examples of corrosion inhibitors may include organic corrosion inhibitors and inorganic corrosion inhibitors.

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

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

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

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

  In addition, the magnetic sheet, based on the total weight of the magnetic sheet, 6 wt% to 12 wt% polyurethane resin as a binder resin, 0.5 wt% to 2 wt% isocyanate curing agent, 0.3 wt% % To 1.5 wt% epoxy resin.

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

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

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

  The magnetic sheet has a magnetic permeability of about 100 to about 300 at an alternating current of 3 MHz, a magnetic permeability of about 80 to about 270 at an alternating current of 6.78 MHz, and a magnetic permeability of about 130 at a frequency of 13.56 MHz. It may have a magnetic permeability of 60 to about 250.

  The magnetic sheet has a magnetic permeability of about 190 to about 250 when the frequency is 3 MHz, a magnetic permeability of about 180 to about 230 when the frequency is 6.78 MHz, and a frequency of 13.56 MHz. It may have a magnetic permeability of about 140 to about 180 AC.

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

  For example, magnetic sheets cannot be cut even after 100, 1000 or 10,000 bends in the MIT folding test under conditions of 90 degrees and 35 RPM. Also, the change in magnetic permeability of the magnetic sheet after bending 100 times, 1000 times, or 10000 times in the MIT bending test under conditions of 90 degrees and 35 RPM may be about 10% or less or about 5% or less.

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

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

  Further, the magnetic sheet may have corrosion resistance capable of withstanding various corrosive environments. For example, in a salt spray test according to KS D 9502, the magnetic sheet may have a rating number of 9.8 or higher. For example, the rating number method is an evaluation method in which the degree of corrosion is indicated by the ratio of the corrosion area to the effective area, and the degree of corrosion is evaluated on a scale of 0-10.

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

  In addition, when the magnetic sheet is attached under high temperature and humidity conditions of 85 ° C. and 85% RH for 72 hours, the thickness change and the magnetic permeability change of the magnetic sheet are both 10% or less, specifically 5% or less, more specifically. Can be 2% or less.

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

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

  The magnetic sheet according to the present embodiment can be manufactured by a method including a step of mixing magnetic powder and a binder resin, a step of molding a sheet-shaped mixture, and a step of drying the sheet. In this case, the same kind and amount of magnetic powder and binder resin as those exemplified above can be used.

  Specifically, a magnetic sheet is obtained by a method including (i) a step of dispersing magnetic powder in a binder resin and a solvent to prepare a slurry; and (ii) a step of molding the slurry into a sheet shape and drying the sheet. Can be made.

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

  As a specific example, first, in addition to a polyurethane resin, an isocyanate curing agent, and an epoxy resin, magnetic powder is added to a solvent and dispersed using a disperser (planetary mixer, homomixer, no-bead mill, etc.). To produce a slurry having a viscosity of about 100 cPs to about 10,000 cPs. After that, the slurry is applied onto the carrier film with a comma coater to form a dry magnetic sheet. The dried magnetic sheet can be made into a polymer magnetic sheet (PMS) by controlling the speed and temperature according to a desired thickness, removing the solvent using a dryer, and winding the formed sheet.

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

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

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

  That is, the method for producing a magnetic sheet comprises a step of curing the binder resin in the magnetic sheet by hot-pressing the magnetic sheet at a pressure of 1 MPa to 100 MPa and a temperature of 100 ° C. to 300 ° C. after performing step (3). It may further include.

  As a result, the obtained magnetic sheet may be a magnetic sheet in which the curing of the binder resin has been completed.

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

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

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

  In another preferred embodiment, the conductive magnetic composite sheet includes a magnetic sheet containing magnetic powder and a binder resin; a first conductive foil arranged on one side of the magnetic sheet; and a magnetic sheet and the first conductive foil. It includes a first primer layer disposed therebetween and joining them to each other. The conductive magnetic composite sheet may further include a second conductive foil disposed on the other side of the magnetic sheet; and a second primer layer disposed between the magnetic sheet and the second conductive foil and bonding these to each other. .

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

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

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

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

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

  The thickness of the conductive foil can range from 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 shown in FIG. 2A, the first conductive foil 210 and the second conductive foil 220 can be directly bonded to the magnetic sheet 100 without a separate adhesive layer. Therefore, the conductive foil can directly contact the surface of the magnetic sheet. In this case, the conductive foil can be directly bonded to the binder resin of the magnetic sheet. Specifically, the conductive foil can be directly bonded to the thermosetting resin that constitutes the binder resin.

  Also, an adhesive layer may be arranged between the magnetic sheet and the conductive foil. That is, the conductive magnetic composite sheet may further include an adhesive layer disposed between the magnetic sheet and the conductive foil. In this case, the adhesive layer can directly contact the magnetic sheet and the conductive foil.

  Therefore, the adhesive layer can adhere the conductive foil to the magnetic sheet. The thickness of the adhesive layer can range from about 0.1 μm to about 20 μm. Specifically, the thickness of the adhesive layer can range from about 0.1 μm to about 10 μm, 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 high heat resistant thermoplastic resin. Specifically, the adhesive layer may include an epoxy resin. The adhesive layer can bond the magnetic sheet to the conductive foil by thermosetting. Thereby, the adhesive layer can have high heat resistance and high adhesiveness.

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

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

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

  Therefore, the primer layer can bond the conductive foil to the magnetic sheet. The thickness of the primer layer can range from about 0.01 μm to about 20 μm. Specifically, the thickness of the primer layer can range from 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 high heat resistant thermoplastic resin, and specifically may include an epoxy resin.

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

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

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

  The epoxy-based resin may have an epoxy equivalent of about 80 g / eq to about 1000 g / eq, or about 100 g / eq to about 300 g / eq. In addition, the epoxy resin may have a number average molecular weight of about 10,000 g / mol to 50,000 g / mol.

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

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

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

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

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

  When the conductive magnetic material is heat-treated twice (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 ° C. at a constant rate for 100 seconds). The conductive magnetic composite sheet has a peel strength between the conductive foil and the magnetic sheet of 0.6 kgf / cm or more, for example, 0.6 kgf / cm to 20 kgf / cm, 0.6 kgf / cm to 10 kgf / cm, 0.6 kgf. / Cm to 5 kgf / cm, or 0.6 kgf / cm to 3 kgf / cm.

  Furthermore, when the heat treatment is repeated twice under the above conditions, the 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, regarding the conductive magnetic composite sheet according to the present embodiment, even if the conductive magnetic composite sheet is subjected to soldering treatment such as reflow treatment, there is almost no change in physical properties such as magnetic permeability and thickness, and Problems such as delamination from the conductive foil do not occur.

  A method for producing a conductive magnetic composite sheet according to one embodiment includes a step of producing a magnetic sheet containing magnetic powder and a binder resin; and a step of stacking a magnetic sheet and a first conductive foil; and the obtained stack ( Alternatively, a step of applying heat and pressure to the stack to bond the magnetic sheet and the first conductive foil is included.

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

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

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

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

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

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

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

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

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

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

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

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

  Further, the magnetic sheet has a magnetic permeability of 100 to 300 in the alternating current having a frequency of 3 MHz, a magnetic permeability of 80 to 270 in the alternating current having a frequency of 6.78 MHz, and a magnetic permeability of 60 to 250 in the alternating current having a frequency of 13.56 MHz. It may have magnetic permeability.

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

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

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

  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 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 tetrakis (glycidyloxyphenyl) ethane type epoxy resin.

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

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

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

  The step of applying heat and pressure may be carried out at a pressure of 1 MPa to 100 MPa and a temperature of 100 ° C to 300 ° C. Also, the step 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. Further, the step 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 step of applying heat and pressure can be performed by a roll-to-roll process or a batch process.

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

  In a roll-to-roll process, the roll temperature may range from about 100 ° C to about 300 ° C. Also, the pressure of the rolls can range from about 1 MPa to about 100 MPa. Further, about 1-20 pairs of rolls can be used in the roll-to-roll process. Further, the speed of movement of the laminate 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 carried out by a roll-to-roll process, in which case the roll-to-roll process comprises a roll temperature of 150 ° C. to 200 ° C. Roll pressures of 5 MPa to 30 MPa and speeds of 1 m / min to 5 m / min can be carried out with 2 to 10 pairs of rolls.

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

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

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

  Then, as shown in FIG. 8, the dry magnetic sheet, the primer layer, and the conductive foil are laminated by heat and pressure 700. This allows the dry magnetic sheet and the conductive foil to be laminated via the primer layer. In this case, the laminating can be carried out under heating and pressure conditions, in particular under the conditions of temperature and pressure mentioned above, by the roll-to-roll process or batch process described above. .

  As a result, the magnetic sheet 100 in which the curing of the binder resin is completed by the heat in the laminating step can be formed. Further, since the primer layer is cured during lamination, the cured primer layer can integrally bond the magnetic sheet and the conductive foil. That is, the cured primer layer can function as an adhesive layer configured to bond the magnetic sheet to the conductive foil. Thereby, the conductive magnetic composite sheet in which the magnetic sheet 100 and the first conductive foil 210 and the magnetic sheet 100 and the second conductive foil 220 are bonded to each other through the cured first primer layer 310 and the second primer layer 320. Can be obtained.

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

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

  The magnetic sheet included in the antenna device can have substantially the same composition and properties as the magnetic sheets of the above-described embodiments, and can be made in substantially the same manner.

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

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

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

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

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

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

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

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

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

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

  According to another preferred embodiment, an antenna device includes a magnetic sheet containing magnetic powder and a binder resin; a first antenna pattern arranged on one side of the magnetic sheet; and a magnetic sheet and a first antenna pattern. A first primer layer disposed between the magnetic sheet and the first antenna pattern for integrally joining the two.

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

  The antenna device may further include vias through the magnetic sheet.

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

  The via contacts the antenna patterns arranged on both sides of the magnetic sheet to electrically connect the antenna patterns to each other. The via 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.

  Further, the magnetic sheet may include a via hole that penetrates vertically. 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 bar is inserted into the first via hole, whereby the first via hole constitutes the first via. obtain. For example, the magnetic sheet includes a first via hole that penetrates 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 present embodiment may have various forms including the shape of the antenna pattern, the connection between the via and the terminal, or the additional wiring.

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

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

  Hereinafter, specific embodiments of the antenna device will be illustrated and described.

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

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

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

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

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

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

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

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

  Referring to FIG. 13, the antenna device according to one specific embodiment may generate the electromagnetic signal 50 by the current flowing through the first antenna pattern. The electromagnetic signal 50 enables transmission and reception of a signal 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 arranged on different sides of the magnetic sheet and are connected through vias penetrating the magnetic sheet, a short circuit is suppressed. In addition, no additional processing such as taping of wiring is required, which can improve processing efficiency. Further, the antenna device according to the present embodiment can prevent an increase in thickness due to the insulating wiring cloth, so that the thin film characteristics of the antenna device can be further improved.

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

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

  When the magnetic sheet is divided into a core region and a peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are arranged in the peripheral region, and the first conductive line pattern and the second conductive line pattern are arranged. Vias are arranged in the peripheral region so that and can cross the core region and connect the end of the first conductive line pattern and the end of the second conductive line pattern.

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

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

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

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

  The peripheral region is arranged around the core region. The peripheral region may have a shape that extends in the same direction as the core region. The peripheral region can be located on either side of the core region.

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

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

  The plurality of first conductive line patterns 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 arranged on the other side of the magnetic sheet. Specifically, the second conductive line pattern is joined to the other side of the magnetic sheet.

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

  The plurality of second conductive line patterns may extend side by side. Also, the second conductive line patterns may be spaced apart from each other.

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

  The via may alternately connect with 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 continuously 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 core region.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  The method for manufacturing the antenna device may further include the step of forming a via 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 show an example of a method for manufacturing an antenna device having a via.

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

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

  After that, a 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 shown in FIG. 12C, the first conductive foil 210 is selectively etched by the mask pattern. The first antenna pattern 230 is formed.

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

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

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

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

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

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

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

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

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

  FIG. 14 shows a part of a portable terminal in which the antenna device according to one embodiment is used. Referring to FIG. 14, the antenna device 20 is arranged in the case 30. The case 30 has an electromagnetic wave transmitting region 32 and an electromagnetic wave non-transmitting region 31. The electromagnetic wave non-transmissive region may include a material that blocks electromagnetic waves, such as a metal. The electromagnetic wave transmitting region may include a material that allows electromagnetic waves to easily pass therethrough, such as glass or plastic. Even if the transmission region is narrowly formed, the antenna device according to the present embodiment can effectively transmit and receive the electromagnetic wave signal 50 at the external terminal 40.

  A conventional antenna device is manufactured by forming an antenna pattern on an insulating substrate layer such as polyimide and adding a magnetic sheet to it, so that conductive line patterns are formed on both sides of the substrate layer and through vias. Even though they are connected alternately, electromagnetic signals are blocked by the magnetic sheets added to one side of the substrate layer. On the other hand, in the antenna device according to the present embodiment, the magnetic sheet is used as the substrate layer to form the conductive line patterns on both sides thereof, and the conductive line patterns are alternately connected via the via to form the coil. Therefore, the transmission of electromagnetic signals is not hindered, and the communication sensitivity can be improved due to the excellent magnetic characteristics of the magnetic sheet.

  Hereinafter, a more specific example will be described as an example.

The materials used in the examples below are as follows:
-Sendust powder: CIF-02A, Crystallite Technology Co.-Polyurethane resin: UD1357, Dainichiseika Kogyo Co., Ltd.-Isocyanate curing agent: isophorone diisocyanate, Sigma-Aldrich-Epoxy resin: bisphenol A type epoxy resin (epoxy equivalent = 189 g / eq), Epikote ^TM 828, Japan Epoxy Resin Co., Ltd.

Example 1: Preparation step of magnetic sheet 1) Preparation of magnetic powder slurry 42.8 parts by weight of sendust powder as magnetic powder, 15.4 parts by weight of polyurethane resin dispersion (25% by weight of polyurethane resin, 75 parts by weight) % 2-butanone), 1.0 part by weight isocyanate-based curing agent dispersion (62% by weight isocyanate-based curing agent, 25% by weight n-butyl acetate, 13% by weight 2-butanone), 0.4 Parts by weight of an epoxy resin dispersion (70% by weight epoxy resin, 3% by weight n-butyl acetate, 15% by weight 2-butanone, 13% by weight toluene), and 40.5 parts by weight toluene. , A planetary mixer at a speed of about 40 rpm to about 50 rpm for 2 hours to prepare a magnetic powder slurry.

Step 2) Preparation of magnetic sheet The above magnetic powder slurry was coated on a carrier film with a comma coater and dried at a temperature of about 110 ° C to prepare a dry magnetic sheet. The final magnetic sheet was obtained by compression hardening the dry magnetic sheet using a hot pressing method at a temperature of about 170 ° C. and a pressure of about 9 MPa for about 30 minutes.

Example 2: Preparation of magnetic composite sheet in which copper foil was laminated An epoxy resin was applied to one side of a copper foil having a thickness of about 37 µm to form a primer layer having a thickness of about 4 µm. Copper foils were arranged on both sides of the magnetic sheet obtained in Example 1, and a stack was formed so that a primer layer was arranged between the magnetic sheet and the copper foil. Then, the stack was compressed by a hot press method at a temperature of about 170 ° C. for about 60 minutes at a pressure of about 9 MPa to compress the stack, thereby producing a magnetic sheet on which copper foils were laminated.

Example 3: Fabrication of antenna device A plurality of via holes having a diameter of about 0.15 mm were formed in the magnetic composite sheet on which the copper foil obtained in Example 2 was laminated by using a drill. Then, a copper plating layer was formed inside the via hole by a copper plating method. The plating layer functioned as a via connecting the top and bottom surfaces of the copper foil to each other. After that, a mask pattern was formed on the upper surface and the bottom surface of the magnetic composite sheet on which the copper foil was laminated, and a part of the copper foil was etched by etching. This resulted in an antenna device having an upper pattern and a lower pattern.

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

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

[Table 1]

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

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

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

Experimental example 3 Heat resistance measurement (Pb floating test)
After the magnetic sheet and the magnetic composite sheet in which the copper foil was laminated were floated in a molten lead bath and left for 40 seconds, their surfaces were observed. As a result, no blister was observed on the entire surface of the magnetic composite sheet in which the magnetic sheet and the copper foil were laminated.

Experimental example 4. Measurement of chemical resistance The magnetic sheet was immersed in a 2N HCl aqueous solution for about 30 minutes, and then changes in mass, thickness, and magnetic permeability of the magnetic sheet were measured. Further, the magnetic sheet was dipped in a 2N NaOH aqueous solution for about 30 minutes, and then changes in mass, thickness and magnetic permeability of the magnetic sheet were measured. As a result, precipitation of the magnetic powder did not occur at the bottom of the solution, and the measured values of changes in the mass, thickness and magnetic permeability of the magnetic sheet were each 5% or less.

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

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

Experimental example 7 Bonding strength measurement (cross cut test)
The cross-cut test (ASTM D3369) was used to measure the bonding strength between the magnetic sheet and the copper foil of the magnetic sheet on which the copper foil was laminated. As a result of the cross-cut test, a bonding strength of 0/100 to 5/100 was measured.

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

Example 4: Preparation of magnetic sheet Using the organically coated Sendust powder as the magnetic powder in step (1) of Example 1, the procedure of steps (1) and (2) of Example 1 was repeated. A magnetic sheet was produced.

Experimental Example 9. Breakdown Voltage Measurement The breakdown voltage was measured by installing electrodes on both sides of each of the magnetic sheets obtained in Examples 1 and 4 and applying the voltage while gradually increasing the voltage.
As a result, the magnetic sheet obtained in Example 1 had a breakdown voltage of 4 kV, and the magnetic sheet obtained in Example 4 had a breakdown voltage of 4.3 kV.

Experimental example 10. Insulation Property Measurement Using the magnetic sheet obtained in Example 4, a magnetic composite sheet in which copper foils were laminated was prepared in the same manner as in Example 2. Then, two via holes having a diameter of 400 μm were formed in the magnetic composite sheet in which the copper foils were laminated, and copper plating was performed in the via holes in the same manner as in Example 3. Further, as in Example 3, the copper foil was etched to form the upper pattern and the lower pattern, but the two via holes could not be connected to the pattern. Then, the resistance between the two via holes was measured while passing a current through the two via holes.

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

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

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

Claims (22)

An antenna device,
Magnetic sheet;
An antenna pattern disposed on one side or both sides of the magnetic sheet; and at least one via penetrating the magnetic sheet and connected to the antenna pattern,
(I) The magnetic sheet is a flexible non-sintered sheet having a thickness of 10 μm to 500 μm, and the magnetic sheet comprises a binder resin and magnetic powder dispersed in the binder resin,
(Ii) The magnetic sheet has 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 an alternating current having a frequency of 13.56 MHz. Has a magnetic permeability of 60 to 250 based on
(Iii) When the heat treatment is performed twice, the magnetic sheet has a thickness change of 5% or less and a permeability change of 5% or less, and the heat treatment is to heat from 30 ° C to 240 ° C at a constant rate for 200 seconds. , Then cooling at a constant rate from 240 ° C to 130 ° C for 100 seconds,
(Iv) The change in thickness of the magnetic sheet when immersed in a 2N hydrochloric acid solution for 30 minutes is 5% or less, the change in magnetic permeability of the magnetic sheet is 5% or less, and when immersed in a 2N sodium hydroxide solution for 30 minutes. the change in thickness of the magnetic sheet is 5% or less, the magnetic permeability change of the magnetic sheet is Ri der than 5%,
(V) The magnetic powder is oxide magnetic powder, metal magnetic powder or a mixed powder thereof, and
(Vi) The antenna device, wherein the binder resin contains a polyurethane resin, an isocyanate curing agent or an epoxy resin. The antenna pattern comprises a first antenna pattern arranged on one side of the magnetic sheet, the antenna device further comprises a wiring pattern arranged on the other side of the magnetic sheet, and a via. The antenna device according to claim 1, wherein the antenna device has a first via penetrating the magnetic sheet and connected to one end of the first antenna pattern and one end of the wiring pattern. The first antenna pattern and the wiring pattern are formed of a conductive material, the first antenna pattern is directly bonded to one side of the magnetic sheet, and the wiring pattern is directly bonded to the other side of the magnetic sheet, The antenna device according to claim 2. The antenna device according to claim 2, wherein the first antenna pattern has a coil shape. The antenna device according to claim 2, wherein the magnetic sheet has a first via hole vertically penetrating the magnetic sheet, and an inner wall of the first via hole is plated to form a first via. . A first terminal pattern disposed on one side of the magnetic sheet; and a second via penetrating the magnetic sheet, the second via being connected to the other ends of the first terminal pattern and the wiring pattern. The antenna device according to claim 2, wherein The magnetic sheet further comprises a second terminal pattern disposed on one side of the magnetic sheet, the second terminal pattern being connected to the other end of the first antenna pattern, and the first terminal pattern and the second terminal pattern. The antenna device according to claim 6, wherein and are arranged adjacent to each other. The antenna device according to claim 2, further comprising a first terminal pattern disposed on the other side of the magnetic sheet, the first terminal pattern being connected to the other end of the wiring pattern. A second terminal pattern disposed on the other side of the magnetic sheet; and a second via penetrating the magnetic sheet, the second via connected to the other end of the second terminal pattern and the first antenna pattern. 9. The antenna device according to claim 8, wherein the first terminal pattern and the second terminal pattern are arranged so as to be adjacent to each other. The antenna pattern includes a plurality of first conductive line patterns arranged in parallel on one side of the magnetic sheet so as to be separated from each other; and a plurality of second conductive lines arranged on the other side of the magnetic sheet so as to be separated from each other. Pattern, the extending direction of the first conductive line pattern is the same as the extending direction of the second conductive line pattern, and the via penetrates the magnetic sheet to form the first conductive line pattern and the second conductive line pattern. The antenna device of claim 1, wherein the antenna device comprises a plurality of vias connecting to and. The vias are alternately connected to the first conductive line patterns and the second conductive line patterns that are arranged in parallel so as to be separated from each other, and two second conductive line patterns in which one end and the other end of an arbitrary first conductive line pattern are adjacent to each other. 11. The antenna device according to claim 10, wherein each of the second conductive line patterns is connected to two adjacent first conductive line patterns, and one end and the other end of any second conductive line pattern are connected to two adjacent first conductive line patterns. When the magnetic sheet is divided into the core region and the peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are arranged in the peripheral region, while the first conductive line pattern and the second conductive line pattern are arranged. The antenna according to claim 10, wherein the line pattern traverses the core region, and vias are arranged in the peripheral region to connect an end of the first conductive line pattern and an end of the second conductive line pattern. ·device. The antenna device according to claim 12, wherein the first conductive line pattern, the second conductive line pattern, and the via are connected to each other to form a coil surrounding the core region. The antenna device according to claim 1, wherein the magnetic powder comprises sendust powder. The antenna device according to claim 1, wherein the binder resin includes a polyurethane resin, an isocyanate curing agent, and an epoxy resin. A portable terminal comprising a case and an antenna device arranged in the case,
The case has an electromagnetic wave transmitting region and an electromagnetic wave non-transmitting region,
The antenna device includes a magnetic sheet; a plurality of first conductive line patterns arranged in parallel on one side of the magnetic sheet so as to be separated from each other; a plurality of second conductive lines arranged on the other side of the magnetic sheet so as to be separated from each other. A conductive line pattern; and a plurality of vias penetrating the magnetic sheet,
The extending direction of the first conductive line pattern and the extending direction of the second conductive line pattern are the same, and the electromagnetic wave transmitting region is arranged in parallel with the first conductive line pattern and the second conductive line pattern,
(I) The magnetic sheet is a flexible non-sintered sheet having a thickness of 10 μm to 500 μm, and the magnetic sheet comprises a binder resin and magnetic powder dispersed in the binder resin,
(Ii) The magnetic sheet has 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 an alternating current having a frequency of 13.56 MHz. Has a magnetic permeability of 60 to 250 based on
(Iii) When the heat treatment is performed twice, the magnetic sheet has a thickness change of 5% or less and a permeability change of 5% or less, and the heat treatment is to heat from 30 ° C to 240 ° C at a constant rate for 200 seconds. , Then cooling at a constant rate from 240 ° C to 130 ° C for 100 seconds,
(Iv) The change in thickness of the magnetic sheet when immersed in a 2N hydrochloric acid solution for 30 minutes is 5% or less, the change in magnetic permeability of the magnetic sheet is 5% or less, and when immersed in a 2N sodium hydroxide solution for 30 minutes. the change in thickness of the magnetic sheet is 5% or less, the magnetic permeability change of the magnetic sheet is Ri der than 5%,
(V) The magnetic powder is oxide magnetic powder, metal magnetic powder or a mixed powder thereof, and
(Vi) A portable terminal in which the binder resin contains a polyurethane resin, an isocyanate curing agent or an epoxy resin . When the magnetic sheet is divided into the core region and the peripheral region around the core region, both ends of the first conductive line pattern and the second conductive line pattern are arranged in the peripheral region, while the first conductive line pattern and the second conductive line pattern are arranged. 17. The portable according to claim 16 , wherein the line pattern traverses the core region, and vias are arranged in the peripheral region to connect an end of the first conductive line pattern and an end of the second conductive line pattern. Terminal. 18. The portable terminal according to claim 17 , wherein the first conductive line pattern, the second conductive line pattern, and the via are connected to each other to form a coil surrounding the core region. Antenna devices in a direction perpendicular to the extending direction of the first conductive line pattern and the second conductive line pattern causes an electromagnetic signal, said electromagnetic signal goes outside the case through the electromagnetic wave transmission area, claim 16 Portable terminal described in. 17. The portable terminal according to claim 16 , wherein the electromagnetic wave transmission area includes glass or plastic, and the electromagnetic wave non-transmission area includes metal. The portable terminal according to claim 16, wherein the magnetic powder comprises sendust powder. The portable terminal according to claim 16, wherein the binder resin includes a polyurethane resin, an isocyanate curing agent, and an epoxy resin.

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