KR20170009301A - Magnetic sheet and manufacturing method thereof - Google Patents

Magnetic sheet and manufacturing method thereof Download PDF

Info

Publication number
KR20170009301A
KR20170009301A KR1020150101116A KR20150101116A KR20170009301A KR 20170009301 A KR20170009301 A KR 20170009301A KR 1020150101116 A KR1020150101116 A KR 1020150101116A KR 20150101116 A KR20150101116 A KR 20150101116A KR 20170009301 A KR20170009301 A KR 20170009301A
Authority
KR
South Korea
Prior art keywords
sheet
magnetic
magnetic sheet
heat
heat treatment
Prior art date
Application number
KR1020150101116A
Other languages
Korean (ko)
Other versions
KR101708040B1 (en
Inventor
김상철
조정식
김상현
김인규
김용현
Original Assignee
주식회사 에프씨엔
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 에프씨엔 filed Critical 주식회사 에프씨엔
Priority to KR1020150101116A priority Critical patent/KR101708040B1/en
Publication of KR20170009301A publication Critical patent/KR20170009301A/en
Application granted granted Critical
Publication of KR101708040B1 publication Critical patent/KR101708040B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
    • H01F10/12—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys
    • H01F10/13—Amorphous metallic alloys, e.g. glassy metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/26—Thin magnetic films, e.g. of one-domain structure characterised by the substrate or intermediate layers
    • H01F10/28—Thin magnetic films, e.g. of one-domain structure characterised by the substrate or intermediate layers characterised by the composition of the substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
    • H01F41/22—Heat treatment; Thermal decomposition; Chemical vapour deposition

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The present invention relates to a magnetic sheet comprising a first sheet provided with a plurality of micro pieces provided with a magnetic body and a second sheet provided with an insulator and positioned between the minute pieces of the first sheet and a method of manufacturing the same.

Description

Magnetic sheet and manufacturing method thereof < RTI ID = 0.0 >

Embodiments relate to a magnetic sheet and a manufacturing method thereof, and more particularly to a loss-suppressing magnetic sheet and a manufacturing method thereof.

BACKGROUND ART [0002] Techniques for wirelessly charging portable terminals and the like have recently been developed using wireless power transmission technology.

In such a wireless power transmission technique, a method of converting electric energy into a magnetic field and transmitting / receiving the magnetic field is used. At this time, a magnetic sheet is used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and / or problems, and it is an object of the present invention to provide a magnetic sheet capable of minimizing energy loss during radio power transmission and being thinner and thinner, and a manufacturing method thereof.

In order to solve the above-described problems, problems and / or limitations, it is an object of the present invention to provide a magnetic recording medium, which comprises a first sheet provided with a plurality of micro- Is provided.

The first sheet and the second sheet may be provided to form a mixture with each other.

And a third sheet provided with the insulator constituting the second sheet and positioned adjacent to the first sheet and the second sheet.

The insulator may comprise carbon.

The magnetic body may include a crystalline magnetic alloy.

The present invention also provides a method of manufacturing a magnetic recording medium, comprising the steps of: preparing a first magnetic sheet provided with an amorphous magnetic body; coating a surface of the first magnetic sheet with a polymer coating to form a second magnetic sheet; Forming a third magnetic sheet, and applying a shock to the third magnetic sheet.

The step of heat-treating the second magnetic sheet may include changing at least a part of the amorphous magnetic body to a crystalline magnetic body.

The step of heat treating the second magnetic sheet may include changing at least a portion of the polymer coating to a carbon material.

And attaching a protective sheet containing an adhesive to the surface of the third magnetic sheet.

The step of heat-treating the second magnetic sheet may include: a first heat treatment step of heat-treating the second magnetic sheet at a first temperature; a second heat treatment step of performing heat treatment of the second magnetic sheet at a second temperature higher than the first temperature; Step < / RTI >

According to the embodiments, it is possible to reduce the eddy current loss to improve the power conversion and transmission efficiency, and suppress the heat generation due to the loss term.

The surface resistance of the magnetic sheet is increased to increase the surface resistance, and the defective portion of the surface-treated polymer is made to penetrate at the same time as the defects are formed, so that the quality factor of the coil used can be improved and the loss can be minimized.

Also, the method of manufacturing a magnetic sheet according to embodiments of the present invention can be manufactured through a continuous process from the beginning to the end, thereby improving energy saving, productivity, and manufacturing cost.

In addition, the used surface treatment agent suppresses the oxidation of amorphous sheet which is vulnerable to oxidation and environment, and protects from the surrounding environment, thereby ensuring environmental reliability such as chemical stability, safety against moisture oxidation and appearance change, and brine environmental stability can do.

1 is a cross-sectional view schematically showing the configuration of a magnetic sheet according to an embodiment.
2 is a cross-sectional view schematically showing the configuration of a magnetic sheet according to another embodiment.
3 is a cross-sectional view schematically showing the configuration of a magnetic sheet according to another embodiment.
4 is a cross-sectional view showing a sheet provided with a first magnetic body.
FIG. 5 is a schematic view illustrating a process of coating a polymer coating material on the sheet shown in FIG.
6 is a cross-sectional view showing a sheet coated with a polymer coating material according to FIG.
7 is a schematic view showing a process of applying an impact to a heat-treated sheet.

Embodiments are capable of various transformations, and specific embodiments are illustrated in the drawings and described in detail. The effects and features of the embodiments, and how to accomplish them, will be apparent with reference to the following detailed description together with the drawings. However, the embodiments are not limited to the embodiments described below, but may be implemented in various forms.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding elements throughout the drawings, and a duplicate description thereof will be omitted.

In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning.

In the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or having mean that a feature or element described in the specification is present, and do not exclude the possibility that one or more other features or elements are added in advance.

In the drawings, components may be exaggerated or reduced in size for convenience of explanation. For example, the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and the following embodiments are not necessarily drawn to scale.

As described above, in a wireless power transmission technique, a snail-shaped conductor is adjacent to a magnetic sheet, and the energy converted into a magnetic field must be transmitted and received with a minimum loss. To this end, when the snail-shaped conductor is adjacent to the magnetic sheet, the skin effect and proximity effect of the conductor should be suppressed, and the magnetic sheet must reduce the hysteresis loss and the eddy current loss. These two losses generate heat when power is transmitted and received, resulting in a drastic drop in power transfer efficiency, thereby destroying the reliability of the contactless power transmission system.

The magnetic sheets used in the wireless power transmission technology must make and accommodate a large number of magnetic fields, and the losses must be minimized. In order for the magnetic sheet to generate and accommodate a large number of magnetic fields, the magnetic permeability must be high. To minimize the loss, the surface resistance of the magnetic sheet must be high and the magnitude of the self-alignment axis must be constant in the x, y, and z directions. Further, the saturation magnetic flux density of the magnetic sheet must be sufficiently high so that the magnetic sheet does not act as a heat generating element, and sufficient power conversion and transmission can be performed.

Transformers and other power conversion and transmission materials are basically based on Ampere's law, a magnetic field is generated when a current flows through a conductor, and a magnetic field is generated according to Faraday's Law and Lenz's Law A phenomenon in which a current is induced in the circuit by a changing magnetic field is utilized.

The induced magnetic force (emf, electro magnetic force) is proportional to the amount and density of magnetic flux. The higher the magnetic permeability of the magnetic sheet and the larger the volume, the greater the amount and density of the magnetic flux. Particularly, in the power transmission of the wireless non-contact type, since the magnetic field created by the primary coil, which is the power transmission side for transmitting power, must be received from the power receiving end without loss, it is necessary to have a high permeability and a large volume, It is necessary to use a magnetic material having a large saturation magnetic flux density so that the power can be sufficiently transmitted even with a small volume and is saturated by the power of the power transmission side and does not act as a heat source.

The soft magnetic materials for high-performance magnetic circuits are divided into DC application characteristics and AC application characteristics according to the application fields. The most important factor in AC application characteristics is the core loss. Energy loss is an important characteristic that determines the efficiency of a device, which is caused by hysteresis loss, eddy current loss, and residual loss. Residual losses are negligible because they are only of very low induction and very high frequencies. Therefore, the total energy loss can be represented by the sum of the magnetic hysteresis loss and the eddy current loss, and as described above, the magnetic sheet should be able to reduce these two losses.

Hysteresis losses play an important role in low frequencies. To reduce this, it is important to apply a hybrid technology to the thinner and more uniform interlayer insulation layer.

In the case of an eddy current loss, it is caused by an electric resistance loss in the magnetic core in an alternating electric field, and therefore, it can be reduced by forming an inter-particle insulating surface layer or by maintaining an amorphous matrix in the inside to increase the electric resistance.

In order to minimize the energy loss characteristic, a technique should be established that minimizes the sum of the magnetic hysteresis loss and the eddy current loss in the frequency region to be used by optimally combining the surface layer insulation characteristic control technique and the high density hybridization technique.

To this end, embodiments of the present invention are directed to improving the power conversion and transfer efficiency by reducing the eddy current loss through simple but highly productive surface treatment on amorphous sheets, one of the soft magnetic materials, can do.

The skin depth of a conductor coil used in a transformer or the like becomes thinner as the frequency and the magnetic permeability of the magnetic material used are increased. As a result, the AC resistance is rapidly increased and joule heat is generated, It can lead to loss. Also, the AC resistance increases due to the proximity effect between the adjacent conductors, so that the power loss due to the joule heat can be increased. Embodiments of the present invention improve the quality factor (Q) of a coil to be used by increasing the surface resistance by giving a defect to the magnetic sheet and allowing the surface treated polymer to penetrate the defective portion at the same time as the defect is made The loss can be minimized.

Also, the method of manufacturing a magnetic sheet according to embodiments of the present invention can be manufactured through a continuous process from the beginning to the end, thereby improving energy saving, productivity, and manufacturing cost.

In addition, the used surface treatment agent suppresses the oxidation of amorphous sheet which is vulnerable to oxidation and environment, and protects from the surrounding environment, thereby ensuring environmental reliability such as chemical stability, safety against moisture oxidation and appearance change, and brine environmental stability can do.

1 is a cross-sectional view schematically showing the configuration of a magnetic sheet 10 according to this embodiment.

Referring to FIG. 1, a magnetic sheet 10 according to an embodiment may include a first sheet 11 and a second sheet 12.

The first sheet 11 includes a plurality of fine pieces 111 formed of a magnetic material, and the fine pieces 111 may be irregularly arranged irregularly as shown in FIG.

These fine pieces 111 may be spaced from each other by a certain distance, and it is not necessary that the intervals of all the fine pieces 111 are spaced apart from each other, and at least a part of the fine pieces 111 are located so as to abut against each other .

The magnetic material may be an Fe-based, Co-based or rare earth-based magnetic alloy.

The fine pieces 111 may be manufactured using an amorphous magnetic alloy, and may include a polycrystalline magnetic alloy to facilitate crushing into the fine pieces 111.

The second sheet 12 is made of an insulator and can be located in a gap between the fine pieces 111 of the first sheet 11. Such an insulator may include carbon.

The magnetic sheet 10 according to the above-described embodiment uses a magnetic body having a plurality of fine defects separated from each other, and insulators are disposed between the fine pieces, thereby imparting surface insulation to the magnetic sheet 10, As a result, the eddy current loss can be reduced as much as possible. In addition, due to the defect between the minute pieces 111 of the magnetic sheet 10, for example, the skin effect of the coils used together with the transformer and the reduction of the conductor area due to the proximity effect are suppressed, Energy loss due to heat can be reduced, and the quality coefficient of the coil can be increased to enhance the power transmission efficiency.

2 is a cross-sectional view schematically showing the configuration of a magnetic sheet 10 'according to another embodiment. The same reference numerals are used for the same components as in FIG. 1, and redundant description of the same components is omitted.

Referring to FIG. 2, the magnetic sheet 10 'according to another embodiment may further include a third sheet 13 in addition to the first sheet 11 and the second sheet 12.

The third sheet 13 is provided as an insulator constituting the second sheet 12 and may be positioned adjacent to the first sheet 11 and the second sheet 12. [ For example, when the first sheet 11 and the second sheet 12 form a mixture with each other, the third sheet 13 may be formed as a thin film on the upper and lower surfaces of the formed mixture. This third sheet 13 may comprise carbon as described above.

The magnetic sheet 10 'according to this embodiment further has a surface insulating property, thereby further reducing the eddy current loss.

The magnetic sheets 10 and 10 'of the above embodiments can be attached to the protective sheet 21 including the adhesive 22 on at least one surface thereof, as shown in FIG. 3, the protective sheet 21 is attached to both surfaces of the magnetic sheets 10 and 10 '. However, the present invention is not limited to this, Can be attached to only one of the upper surface and the lower surface of the base 10 (10 '). The protective sheet 21 may be made of a polymeric film, and the adhesive 22 may have an adhesion force enough to be detachable from the magnetic sheets 10 and 10 '.

Next, an example of a manufacturing method of the magnetic sheets 10 and 10 'of the above-described embodiments will be described.

First, as shown in FIG. 4, a first magnetic sheet 30 provided with an amorphous magnetic body is prepared. According to the embodiment, the first magnetic sheet 30 may have a thickness of several tens to several hundreds of micrometers. The first magnetic sheet 30 may be prepared in the form of a roll, but is not limited thereto. The first magnetic sheet 30 may be in the form of a sheet.

Next, as shown in FIG. 6, a second magnetic sheet 32 having the surface of the first magnetic sheet 30 coated with the polymer coating 31 is prepared. For this coating, as can be seen in FIG. 5, the first magnetic sheet 30 can be made to pass through the container 40 containing the liquid polymer coating 41.

The polymer coating material may include oleic acid, and / or stearic acid. In addition to the wet coating method as shown in FIG. 5, a dry coating method may be used.

After the polymer coating is coated, the polymer coating is thermally cured by heating at about 100 to 150 ° C. The heat-set polymer coatings have relatively high temperature stability and chemical resistance.

Next, the second magnetic sheet 32 coated with the polymer coating material is heat-treated. The heat treatment can be performed on the second magnetic sheet 32 wound in a roll state, and a plurality of rolls can be laminated and heat-treated in a single heat treatment furnace. However, the present invention is not limited to this, but may be applied to a plurality of second magnetic sheets 32 that are cut and stacked in a sheet form.

The heat treatment may include a first heat treatment step of performing heat treatment at a first temperature and a second heat treatment step of performing heat treatment at a second temperature. The second temperature may be a relatively high temperature relative to the first temperature.

The first heat treatment step is a heat treatment for 2 hours to 5 hours at a temperature range of 200 ° C to 350 ° C to impart blue heat brittleness to the second magnetic sheet 32 and the second heat treatment step is performed at a temperature of 400 ° C to 500 ° C The first magnetic sheet 30 can be subjected to heat treatment for 2 hours to 5 hours in the temperature range to impart high-temperature embrittlement.

Each of the first heat treatment step and the second heat treatment step may be performed in a separate heat treatment furnace, but the present invention is not limited thereto, and may be continuously performed in a single heat treatment furnace. For example, at 250 DEG C for 3 hours, and then held at 450 DEG C for 2 hours. By sequentially applying high heat in the heat treatment step, it is possible to prevent a large thermal stress from being applied to the first magnetic sheet 30 at one time and to increase the heat efficiency of the heat treatment furnace, It is possible to impart brittleness which can easily give defects.

As a result of the heat treatment, at least a portion of the amorphous magnetic material of the first magnetic sheet 30 is crystallized, thereby causing grain formation. Accordingly, at least a part of the first magnetic sheet 30 becomes a polycrystalline magnetic body according to the heat treatment.

The heat treatment temperature may be higher than the heat resistant temperature of the surface-treated polymer coating material. When the surface-treated polymer coating material is subjected to heat treatment at a high temperature, pyrolysis is performed, and the product, It is divided.

The gaseous product refers to the exhaust gas produced after pyrolysis and is a low molecular weight chemical component.

The product of the liquid phase is volatilized at the thermal decomposition temperature, but since the second magnetic sheet 32 is laminated to a plurality of (for example, several thousand) layers at the time of heat treatment as described above, Respectively.

The solid product is mostly non-volatile residues and is carbon with low carbon content, i.e. low purity carbon.

The residual liquid phase product and the solid phase product penetrate between the particles of the above-mentioned crystallized magnetic substance.

Impact is applied to the third magnetic sheet 33 formed through the heat treatment to impart defects to the crystalline and / or amorphous magnetic bodies.

7, by passing the third magnetic sheet 33 through the gravure roll 42, it is possible to cause a defect in the crystalline and / or amorphous magnetic body included in the third magnetic sheet 33 have.

The gravure roll 42 may use two successive gravure rolls as shown in Fig. 7. According to the embodiment, the gravure rolls are continuously arranged in plural stages, and the groove size of the gravure rolls at each stage Can be formed differently. Although not shown in the drawings, by allowing the balls to pass further between the flat rolls without grooves, the residues of the above-mentioned surface coating material can evenly enter between the generated defects. Accordingly, as can be seen from the magnetic sheets 10 and 10 'shown in FIG. 1 and / or FIG. 2, the above-mentioned magnetic material is separated into the fine pieces 111 and the defect between the fine pieces 111 So that the residues of the coating can evenly enter into the second sheet 12.

Although not shown in the drawings, a protective layer (not shown) is provided on at least one surface of the third magnetic sheet 33 before passing the third magnetic sheet 33 between the gravure rolls 42, The sheet 21 can be attached. Thus, the third magnetic sheet 33 can be prevented from being broken by the gravure roll 42. This protective sheet 21 can be continuously attached even after the magnetic sheets 10 and 10 'are produced.

The present invention has been described above with reference to preferred embodiments. It will be understood by those skilled in the art that the present invention may be embodied in various other forms without departing from the spirit or essential characteristics thereof. Therefore, the above-described embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (10)

A first sheet provided with a plurality of minute pieces provided with a magnetic body; And
And a second sheet that is provided as an insulator and is located between the fine pieces of the first sheet. The method according to claim 1,
Wherein the first sheet and the second sheet are configured to form a mixture with each other. The method according to claim 1,
And a third sheet provided with an insulator constituting the second sheet and positioned adjacent to the first sheet and the second sheet. 4. The method according to any one of claims 1 to 3, wherein
Wherein the insulator comprises carbon. 4. The method according to any one of claims 1 to 3, wherein
Wherein the magnetic body comprises a crystalline magnetic alloy. Preparing a first magnetic sheet provided with an amorphous magnetic body;
Coating a surface of the first magnetic sheet with a polymer coating to form a second magnetic sheet;
Heat treating the second magnetic sheet to form a third magnetic sheet; And
And applying an impact to the third magnetic sheet. The method according to claim 6,
Wherein the step of heat-treating the second magnetic sheet includes the step of changing at least a part of the amorphous magnetic body to a crystalline magnetic body. The method according to claim 6,
Wherein the step of heat-treating the second magnetic sheet includes the step of changing at least a part of the polymer coating material to a carbon material. The method according to claim 6,
And attaching a protective sheet including an adhesive to the surface of the third magnetic sheet. 10. The method according to any one of claims 6 to 9,
The step of heat-treating the second magnetic sheet may include:
A first heat treatment step of heat-treating the second magnetic sheet at a first temperature; And
And a second heat treatment step of heat-treating the second magnetic sheet at a second temperature higher than the first temperature.
KR1020150101116A 2015-07-16 2015-07-16 Magnetic sheet and manufacturing method thereof KR101708040B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150101116A KR101708040B1 (en) 2015-07-16 2015-07-16 Magnetic sheet and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150101116A KR101708040B1 (en) 2015-07-16 2015-07-16 Magnetic sheet and manufacturing method thereof

Publications (2)

Publication Number Publication Date
KR20170009301A true KR20170009301A (en) 2017-01-25
KR101708040B1 KR101708040B1 (en) 2017-02-17

Family

ID=57991137

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150101116A KR101708040B1 (en) 2015-07-16 2015-07-16 Magnetic sheet and manufacturing method thereof

Country Status (1)

Country Link
KR (1) KR101708040B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020060035A1 (en) * 2018-09-19 2020-03-26 주식회사 아모센스 Magnetic field shielding sheet, method for manufacturing magnetic field shielding sheet, and antenna module using same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11502973A (en) * 1995-03-29 1999-03-09 ミネソタ マイニング アンド マニュファクチャリング カンパニー Electromagnetic force absorbing composite
JP2005116764A (en) * 2003-10-07 2005-04-28 Tdk Corp Method for manufacturing multilayer soft magnetic member and soft magnetic sheet
KR20140109336A (en) * 2013-03-05 2014-09-15 주식회사 아모센스 Composite Sheet for Shielding Magnetic Field and Electromagnetic Wave and Antenna Module Using the Same
KR101481042B1 (en) * 2013-09-09 2015-01-12 에스케이씨 주식회사 Magnetic sheet complex and preparation thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11502973A (en) * 1995-03-29 1999-03-09 ミネソタ マイニング アンド マニュファクチャリング カンパニー Electromagnetic force absorbing composite
JP2005116764A (en) * 2003-10-07 2005-04-28 Tdk Corp Method for manufacturing multilayer soft magnetic member and soft magnetic sheet
KR20140109336A (en) * 2013-03-05 2014-09-15 주식회사 아모센스 Composite Sheet for Shielding Magnetic Field and Electromagnetic Wave and Antenna Module Using the Same
KR101481042B1 (en) * 2013-09-09 2015-01-12 에스케이씨 주식회사 Magnetic sheet complex and preparation thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020060035A1 (en) * 2018-09-19 2020-03-26 주식회사 아모센스 Magnetic field shielding sheet, method for manufacturing magnetic field shielding sheet, and antenna module using same
CN112543983A (en) * 2018-09-19 2021-03-23 阿莫先恩电子电器有限公司 Magnetic field shielding sheet, method for manufacturing magnetic field shielding sheet, and antenna module using magnetic field shielding sheet
CN112543983B (en) * 2018-09-19 2022-10-28 阿莫先恩电子电器有限公司 Magnetic field shielding sheet, method for manufacturing magnetic field shielding sheet, and antenna module using same
US11594356B2 (en) 2018-09-19 2023-02-28 Amosense Co., Ltd. Magnetic field shielding sheet, method for manufacturing magnetic field shielding sheet, and antenna module using same

Also Published As

Publication number Publication date
KR101708040B1 (en) 2017-02-17

Similar Documents

Publication Publication Date Title
CN109643603A (en) Iron core and motor
JPWO2003060175A1 (en) Magnetic substrate, laminate of magnetic substrate, and method for producing the same
CN109887737B (en) Nanocrystalline magnetic conductive sheet for wireless charging and preparation method thereof
CN112467824B (en) Wireless charging shielding sheet, preparation method thereof, wireless charging module and magnetic crushing equipment
KR101708040B1 (en) Magnetic sheet and manufacturing method thereof
JPS58175654A (en) Manufacture of laminated bonded amorphous alloy band and iron core
KR102109279B1 (en) A manufacturing method of stacked core for transformer with excellent no-load loss
KR20170051570A (en) Manufacturing device and manufacturing method of magnetic shielding sheet
KR102133909B1 (en) Grain oriented electrical steel sheet and method for manufacturing the same
US7041148B2 (en) Coated ferromagnetic particles and compositions containing the same
KR101372777B1 (en) Grain-oriented electrical steel sheet with excellent magnetic property and a method for manufacturing it
WO2009125639A1 (en) Wound magnetic core and process for production thereof
CN111816436B (en) Soft magnetic material and preparation method thereof
CN107025987A (en) A kind of distribution transformer and core manufacturing method with iron based nano crystal iron core
JP2021005645A (en) Laminated iron core and manufacturing method thereof, and electrical device using laminated iron core
JP6460115B2 (en) Amorphous alloy magnetic core and manufacturing method thereof
US3106496A (en) Process for coating and annealing grain oriented silicon steels
JPH0552652B2 (en)
JP5372312B2 (en) Magnetic article using magnetic metal ribbon coated with insulator
KR101215236B1 (en) Method for providing a isolation coating and assembly thereby
US20030209287A1 (en) Magnetic core insulation
WO2023243697A1 (en) Multilayer soft magnetic alloy thin strip and method for producing same, and laminated core and method for producing same
US20230238163A1 (en) Electrical steel lamination stacks with magnetic insulator coating for electrical apparatus cores
CN117238650A (en) Iron-based nanocrystalline magnetizer and preparation method and application thereof
Soinski et al. The applicability of nanocrystalline stacked cores for power electronics

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant