KR101675146B1 - Manufacturing method of magnetic shielding sheet and flake device for this - Google Patents

Manufacturing method of magnetic shielding sheet and flake device for this Download PDF

Info

Publication number
KR101675146B1
KR101675146B1 KR1020150065329A KR20150065329A KR101675146B1 KR 101675146 B1 KR101675146 B1 KR 101675146B1 KR 1020150065329 A KR1020150065329 A KR 1020150065329A KR 20150065329 A KR20150065329 A KR 20150065329A KR 101675146 B1 KR101675146 B1 KR 101675146B1
Authority
KR
South Korea
Prior art keywords
shielding plate
plate layer
layer
notch
flaking
Prior art date
Application number
KR1020150065329A
Other languages
Korean (ko)
Inventor
김종환
윤승재
박홍진
Original Assignee
주식회사 비에스피
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 비에스피 filed Critical 주식회사 비에스피
Priority to KR1020150065329A priority Critical patent/KR101675146B1/en
Application granted granted Critical
Publication of KR101675146B1 publication Critical patent/KR101675146B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0075—Magnetic shielding materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The present invention relates to a method of manufacturing a magnetic shield sheet capable of reducing a loss due to an eddy current generated when an AC magnetic field is applied to a shielding plate layer, .
To this end, a method of manufacturing a magnetic shield sheet includes a lamination step of laminating a shielding plate layer on a base layer and a flaking step of separating the shielding plate layer into a plurality of fine pieces. Wherein the flaking step includes a notch step of forming a notch spaced apart from the shielding plate layer, and a stressing step of applying a tensile force, at least one of compressive force and shear force, to the shielding plate layer having been subjected to the notch step. Then, cracks are generated from the notch portion through the notch step and the stress step, or cracks are generated from the crack part formed by the deformation of the notch part, thereby separating the shielding plate layer into a plurality of fine pieces.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a magnetic field shielding sheet and a flake device for the same,

The present invention relates to a method of manufacturing a magnetic shield sheet and a flake device for the same, and more particularly, to a method of manufacturing a magnetic shield sheet by applying a small amount of flake processing to a shield plate layer and forming an eddy current The present invention relates to a method of manufacturing a magnetic shield sheet and a flake apparatus therefor.

In general, various functions such as RFID, NFC, wireless charger, and pen tablet are added to mobile devices such as mobile phones, tablet PCs, and notebooks. Most of the additional functions of these portable devices use magnetic fields in the range of several tens of kHz to several tens MHz. When exposed to a magnetic field of such frequency, various components built in a portable device such as a battery are affected.

Therefore, a magnetic shielding sheet is essentially used to prevent the mobile device from affecting parts of a portable device such as a battery due to the magnetic field used and to improve the function of using the magnetic field by focusing the magnetic field.

However, conventional magnetic field shielding sheets involve a flaking process of separating the shielding plate layer into a plurality of fine pieces by applying mechanical stress to the shielding plate layer by a pressing roller or a pressing unit having a plurality of unevenness on the outer surface. At this time, the protective film or the double-sided tape adhered to the shielding plate layer may be damaged, and it may be difficult to separate the shielding plate layer into finer pieces, so that when the alternating magnetic field is applied to the shielding plate layer, Eddy Current).

Korean Patent Laid-Open Publication No. 2005-0037015 (entitled "Metal and Polymer Complex Having Low Frequency Magnetic Field Shielding Function," published on Apr. 21, 2005)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art, and to provide a method of reducing flickering of a shielding plate layer into small pieces by flake processing and reducing loss due to Eddy Current generated when an AC magnetic field is applied to the shielding plate layer Shielding sheet, and a flake device therefor.

According to a preferred embodiment of the present invention for achieving the object of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: laminating a shielding plate layer on a base layer; And a flaking step of separating the shielding plate layer into a plurality of fine pieces, wherein the flaking step comprises irradiating the shielding plate layer with a laser beam to form a notch portion which is recessed or penetrated into the shielding plate layer and spaced apart from each other Notch step; And a stressing step of applying a tensile force, compressive force, and / or shearing force to both sides of the shielding plate layer that have been subjected to the notch step, and cracks are generated from the notch portion through the notching step and the stressing step Or cracks are generated from the cracks formed by the deformation of the notch portion, thereby separating the shielding plate layer into a plurality of fine pieces.

delete

Here, the flaking further includes a vibration step of vibrating the shielding plate layer.

The method of manufacturing a magnetic shield sheet of the present invention further includes a finishing step performed after the flaking step to form a finishing layer to be laminated on the shielding plate layer while being filled in a gap between the plurality of microstructures Wherein the magnetic shielding sheet is made of a magnetic material.

The flake device of the magnetic shield sheet of the present invention comprises a laser unit for irradiating the shielding plate layer with a laser beam to form a notch portion that is recessed or penetrated into the shielding plate layer and spaced apart from each other; And a stress unit that applies a tensile force and / or a compressive force and a shear force to both sides of the shielding plate layer in a state where the base layer and the shielding plate layer are laminated.

The flake device of the magnetic shield sheet of the present invention further includes a vibration unit for vibrating the shielding plate layer.

According to the manufacturing method of the magnetic shield sheet and the flake device therefor, the shielding plate layer is flaked in small pieces into fine pieces, and the loss due to the eddy current generated when the alternating magnetic field is applied to the shielding plate layer .

Further, the present invention can prevent the influence of the magnetic field on the body of the portable device and the battery and the battery by the manufacturing method of the magnetic shield sheet and the flake device, and increase the quality coefficient of the secondary coil in the wireless charger, can do.

In addition, the present invention can easily form the notch portion by using the concentrated laser beam, and can adjust the size of the fine piece to be smaller by arbitrarily adjusting the position of the notch portion or the cracked portion in the shielding plate layer, It is not necessary to apply an impact to the shielding sheet, the breakage of the base layer and the adhesive layer can be suppressed or prevented, and the flake device can be made compact.

In addition, the present invention can improve the magnetic permeability by controlling the magnetic anisotropy of the shielding plate layer by performing surface treatment or heat treatment with a laser beam under a magnetic field or a non-magnetic field.

Further, the present invention can promote diffusion of cracks around the notch portion through the vibration step or the vibration unit, and can expand or maintain the clearance between the plurality of fine pieces in the shielding plate layer.

In addition, the present invention can reduce the thickness of the magnetic shielding sheet by applying a compressive force through the finishing step or the finish layer, and can lead the portable device to be thinned.

1 is a view illustrating a magnetic shield sheet according to an embodiment of the present invention.
2 is a view illustrating a method of manufacturing a magnetic shield sheet according to an embodiment of the present invention.
3 is a view showing a state of a magnetic shield sheet according to a flake step in an embodiment of the present invention.
FIG. 4 is a view showing a state of cracks generated in the notch portion according to the stress step in the embodiment of the present invention. FIG.

Hereinafter, a method of manufacturing a magnetic shield sheet according to the present invention and a flake device therefor will be described with reference to the accompanying drawings. Here, the present invention is not limited or limited by the examples. Further, in describing the present invention, a detailed description of well-known functions or constructions may be omitted for clarity of the present invention.

FIG. 1 is a view showing a magnetic shield sheet according to an embodiment of the present invention, FIG. 2 is a view illustrating a method of manufacturing a magnetic shield sheet according to an embodiment of the present invention, FIG. 3 is a cross- FIG. 4 is a view showing a state of a crack generated in a notch portion according to a stress step in an embodiment of the present invention. FIG.

1 to 4, a magnetic shield sheet according to an embodiment of the present invention includes a base layer 1, a shielding plate layer 3, and a finishing layer 5.

The base layer (1) forms the base of the magnetic shielding sheet.

The shielding plate layer 3 is laminated on the base layer 1. The shielding plate layer 3 is divided into a plurality of fine pieces 4. For example, the shielding plate layer 3 may be laminated on the base layer 1 in the form of a magnetic sheet and separated into a plurality of fine pieces 4 through the flaking step S2 described later.

The shielding plate layer 3 may be a magnetic material such as an Fe-based, Co-based or Ni-based amorphous alloy ribbon, a nanocrystalline alloy ribbon, a ferrite sheet, or a polymer sheet containing magnetic powder. Here, the Fe-based, Co-based, or Ni-based amorphous ribbon alloy or nanocrystalline alloy can be heat-treated under a magnetic field or a non-magnetic field.

At this time, an adhesive layer (2) may be interposed between the base layer (1) and the shielding plate layer (3). The shielding plate layer 3 is bonded to the adhesive layer 2. The adhesive layer (2) is laminated on one side of the base layer (1). The adhesive layer (2) allows the base layer (1) and the shielding plate layer (3) to adhere to each other. Here, when the base layer 1 is made of a thermosetting polymer, the adhesive layer 2 may be omitted.

The thermosetting polymer is a thermally deformable material that is formed in a sheet form at room temperature and is softened when heat is applied to impart a self-sticking property to a semi-molten state or a molten state. The thermosetting polymer is cured as it is cooled and is fixed to the shielding plate layer 2 while maintaining its shape before cooling. Further, when the thermosetting polymer is cooled and reheated, it is not softened again.

The finish layer (5) is laminated on the shielding plate layer (3). The finish layer (5) is filled in a gap between a plurality of micro pieces (4).

For example, the finish layer (5) is sprayed or applied to the shielding plate layer (3). At this time, the finish layer 5 may be sprayed or applied to the shielding plate layer 3 through the injection unit. Here, when the shielding plate layer 3 is further laminated on the finish layer 5 to be sprayed or applied, it is necessary to include the adhesive layer 2 between the finish layer 5 and the shielding plate layer 3 do. The adhesive layer (2) causes the finish layer (5) and the shielding plate layer (3) to adhere to each other.

Here, when the Fe-based metal ribbon is flaked with the shielding plate layer 2, moisture penetrates into a gap between a plurality of micro-pieces 3, so that the metal ribbon can be easily oxidized. Further, when the metal ribbon is oxidized, a problem arises in appearance, and the characteristics of the elements bonded with oxygen may be changed to lower the shielding property. At this time, the finishing layer 5 is sprayed or applied to the shielding plate layer 3 so that the finishing layer 5 is completely filled in the gap between the plurality of fine pieces 4, and the shielding plate layer 3 ). Therefore, the above-described problems can be sufficiently solved through the finishing layer 5.

As another example, the finish layer 5 may comprise the thermosetting polymer. A plurality of the finishing layers 5 made of the thermosetting polymer are laminated and the shielding plate layer 3 is interposed between the finishing layers 5 so that a plurality of the shielding plate layers 3 can be provided have.

At this time, the finish layer 5 may be formed of the thermosetting polymer, or the base layer 1 and the finish layer 5 may be formed of the thermosetting polymer to cover the shielding plate layer 3 to be laminated. When the shielding plate layer 3 is subjected to the flaking treatment, a part of the finishing layer 5 is completely filled in the gap between the plurality of fine pieces 4, thereby obtaining the electrical insulation effect and the antioxidation effect .

Here, reference numeral 6 denotes an arrangement adhesive layer laminated on the other surface of the base layer 1, and reference numeral 7 denotes a film desorption layer detachably adhered to the arrangement adhesive layer 6.

The batch adhesive layer 6 is then interposed between the base layer 1 and the film desorption layer 7 so that the base layer 1 and the film desorption layer 7 are adhered to each other, 7 can be detachably attached to the arrangement adhesive layer 6. [

Further, the unexplained reference numeral 3a is a notched portion formed in the shielding plate layer 3 by a laser beam, and the unexplained reference numeral 3b is a cracked portion formed by the deformation of the notched portion 3a. The notched portion 3a and the cracked portion 3b form a gap in the shielding plate layer 3.

Hereinafter, a method of manufacturing a magnetic shielding apparatus according to an embodiment of the present invention will be described.

The method for manufacturing a magnetic shielding device according to an embodiment of the present invention includes a stacking step S1 and a flaking step S2 as a method for manufacturing the magnetic shielding sheet described above and further includes a finishing step S3 can do.

In the laminating step (S1), the shielding plate layer (3) is laminated on the base layer (1). At this time, an adhesive layer 2 is interposed between the base layer 1 and the shielding plate layer 3, and the base layer 1 and the shielding plate layer 3 are bonded to both surfaces of the adhesive layer 2, .

The flaking step S2 separates the shielding plate layer 3 into a plurality of fine pieces 4. The flaking step S2 may include a notch step S21 and a stress step S22, and may further include a vibration step S23.

The notch step S21 forms a plurality of notches 3a spaced apart from each other in the shielding plate layer 3. [ At this time, the notch portion 3a is recessed or penetrated into the shielding plate layer 3 by the intermittently irradiated laser beam. At this time, the notch portion 3a may be formed in a point shape or a line shape.

The shielding plate layer 3 may be surface-treated or heat-treated by a laser beam as the notch step S21 is performed.

The stressing step S22 imparts tensile force, compressive force, and shearing force to the shielding plate layer 3 that has undergone the notch step S21. In the stress step S22, as shown in FIG. 4A, the notch portion 3a may be deformed by a tensile force to form the cracked portion 3b. In the stress step S22, as shown in FIG. 4B, the notch portion 3a is deformed by the compressive force to form the cracked portion 3b. In the stressing step S22, as shown in FIG. 4C, the notch portion 3a may be deformed by the shear force to form the cracking portion 3b.

Then, in the flaking step S2, cracks are generated from the notch portion 3a through the notch step S21 and the stress step S22, or cracks are formed by deformation of the notch portion 3a, The shield plate layer 3 can be divided into a plurality of fine pieces 4 by generating cracks from the plurality of fine pieces 3b.

The vibration step S23 is performed in the flaking step S2 or the finishing step S3. The vibration step S23 causes the shielding plate layer 3 to vibrate. The vibration step S23 is carried out by the vibration unit V which directly or indirectly vibrates the shielding plate layer 3. [

The finishing step S3 forms a finishing layer 5 to be laminated on the shielding plate layer 3 while being filled in a gap between the plurality of minute pieces 4.

For example, the finishing step S3 may be performed by a heating unit (not shown) for heating the finish layer 5 made of a thermosetting polymer.

The shielding plate layer 3 is further laminated on the finish layer 5 made of a thermosetting polymer after the finishing step S3 and the flaking step S2 and the finishing step S3 are performed, It is possible to realize a structure in which a plurality of the shielding plate layers 3 are laminated on the magnetic shield sheet.

As another example, the finishing step S3 may be carried out by an injection unit (not shown) for spraying or applying the finish layer 5. The finishing step S3 may be performed by bending the shielding plate layer 3 by a bending unit (not shown) so that a gap between a plurality of micro pieces 4 is opened and then being carried out by the injection unit .

After the finishing step (S3), the finishing layer (5) to be sprayed or applied is cured, and the adhesive layer (2) and the shielding plate layer (3) are further laminated on the finish layer (5) By performing the flaking step (S2) and the finishing step (S3), a structure in which a plurality of the shielding plate layers (3) are laminated in the magnetic shield sheet can be realized.

Finally, after the finishing step (S3), the finished magnetic layer shielding sheet can be realized by curing the outermost layer (5). The finish layer 5 may be allowed to stand in the air to be cured, and may be cured by a separate curing unit (not shown).

Hereinafter, a flake device of a magnetic shield sheet according to an embodiment of the present invention will be described.

A flake device of a magnetic shield sheet according to an embodiment of the present invention is a flake device of a magnetic shield sheet necessary to perform the flake step S2 and includes a laser unit L and a stress unit S, And may further include a vibration unit (V).

The laser unit L intermittently irradiates the shielding plate layer 3 with a laser beam so as to form the notch 3a. At this time, the notch portion 3a may be formed in a point shape or a line shape. The laser unit L may be used to perform the notch step S21.

The shielding plate layer 3 may be surface-treated or heat-treated by a laser beam irradiated from the laser unit L.

The stress unit S applies at least one of a tensile force and a compressive force and a shearing force to the shielding plate layer 3 in a state where the base layer 1 and the shielding plate layer 3 are laminated. The stress unit S may be used to perform the stress step S22.

The vibrating unit (V) vibrates the shielding plate layer (3). The vibration unit V may be used to perform the vibration step S23.

According to the above-described method for producing a magnetic shield sheet and the flake apparatus therefor, the shield plate layer 3 is flaked to a small size with the fine piece 4, and when the AC magnetic field is applied to the shield plate layer 3 The loss due to the eddy current can be reduced. Further, the influence of the magnetic field on the main body and the battery of the portable apparatus and the like can be blocked, and the quality factor of the secondary coil can be increased in the wireless charger, so that the power transmission efficiency can be improved.

Further, by using the concentrated laser beam, the notched portion 3a can be easily formed and the size of the fine piece 4 can be adjusted to be smaller by arbitrarily adjusting the position of the notched portion 3a, It is not necessary to apply a shock to the magnetic shield sheet for the purpose of processing, and the breakage of the base layer 1 and the adhesive layer 2 can be suppressed or prevented, and the flake device can be made compact. In addition, by performing surface treatment or heat treatment with a laser, the magnetic anisotropy of the shielding plate layer 3 can be controlled to improve the permeability. It is also possible to accelerate diffusion of cracks around the notch portion 3a through the vibration step S23 or the vibration unit V and to prevent cracks in the shield plate layer 3 Can be expanded or maintained. In addition, it is possible to reduce the thickness of the magnetic shielding sheet by applying a compressive force through the finishing step (S3) or the finish layer (5), and to induce the portable device using the wireless charging technique to be thin.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Modify or modify the Software.

1: base layer 2: adhesive layer 3: shielding plate layer
3a: notch portion 3b: crack portion 4: fine piece
5: finish layer 6: batch adhesion layer 7: desorption layer
S1: stacking step S2: flake step S21: notch step
S22: Stress step S23: Vibration step S3: Finishing step
L: Laser unit S: Stress unit V: Vibration unit

Claims (6)

A lamination step of laminating a shielding plate layer on the base layer; And
And a flaking step of separating the shielding plate layer into a plurality of fine pieces,
Wherein the flaking comprises:
A notch step of irradiating the shielding plate layer with a laser beam to form a notch portion which is recessed or penetrated into the shielding plate layer and spaced apart from each other; And
And a stressing step of applying a tensile force, compressive force, and shearing force to both sides of the shielding plate layer that have been subjected to the notch step,
Wherein cracks are generated from the notch portion or the crack portion formed by the deformation of the notch portion while passing through the notch portion and the stress portion to separate the shield plate layer into a plurality of fine pieces. A method of manufacturing a shielding sheet. delete The method according to claim 1,
Wherein the flaking comprises:
And a vibration step of vibrating the shielding plate layer. The method according to claim 1,
And a finishing step performed after the flaking step to form a finishing layer to be laminated on the shielding plate layer while being filled in a gap between the plurality of microstructures. A flake device of a magnetic shield sheet for implementing the method of manufacturing a magnetic shield sheet according to claim 1,
A laser unit for irradiating the shielding plate layer with a laser beam to form a notch portion which is recessed or penetrated into the shielding plate layer and spaced apart from each other; And
And a stress unit that applies a tensile force and / or a compressive force and / or a shearing force to both sides of the shielding plate layer in a state where the base layer and the shielding plate layer are laminated. 6. The method of claim 5,
And a vibrating unit for vibrating the shielding plate layer. ≪ RTI ID = 0.0 > 11. < / RTI >
KR1020150065329A 2015-05-11 2015-05-11 Manufacturing method of magnetic shielding sheet and flake device for this KR101675146B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150065329A KR101675146B1 (en) 2015-05-11 2015-05-11 Manufacturing method of magnetic shielding sheet and flake device for this

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150065329A KR101675146B1 (en) 2015-05-11 2015-05-11 Manufacturing method of magnetic shielding sheet and flake device for this

Publications (1)

Publication Number Publication Date
KR101675146B1 true KR101675146B1 (en) 2016-11-11

Family

ID=57527741

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150065329A KR101675146B1 (en) 2015-05-11 2015-05-11 Manufacturing method of magnetic shielding sheet and flake device for this

Country Status (1)

Country Link
KR (1) KR101675146B1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0550798U (en) * 1991-12-05 1993-07-02 株式会社リケン Magnetic filter for opening of magnetically shielded room
US6699597B2 (en) * 2001-08-16 2004-03-02 3M Innovative Properties Company Method and materials for patterning of an amorphous, non-polymeric, organic matrix with electrically active material disposed therein
KR20050037015A (en) 2003-10-17 2005-04-21 노바템스 주식회사 Metal and polymer compound for shielding low frequency magnetic field
KR100629861B1 (en) * 2005-08-31 2006-10-02 서피스텍 주식회사 A method for manufacturing base film unit for electromagnetic wave shield filter and a base film unit for electromagnetic wave shield filter according to the method
KR101399023B1 (en) * 2011-12-21 2014-05-27 주식회사 아모센스 Magnetic Shielding Sheet for Wireless Power Charger, Manufacturing Method thereof, and Receiving Apparatus for Wireless Power Charger Using the Same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0550798U (en) * 1991-12-05 1993-07-02 株式会社リケン Magnetic filter for opening of magnetically shielded room
US6699597B2 (en) * 2001-08-16 2004-03-02 3M Innovative Properties Company Method and materials for patterning of an amorphous, non-polymeric, organic matrix with electrically active material disposed therein
KR20050037015A (en) 2003-10-17 2005-04-21 노바템스 주식회사 Metal and polymer compound for shielding low frequency magnetic field
KR100629861B1 (en) * 2005-08-31 2006-10-02 서피스텍 주식회사 A method for manufacturing base film unit for electromagnetic wave shield filter and a base film unit for electromagnetic wave shield filter according to the method
KR101399023B1 (en) * 2011-12-21 2014-05-27 주식회사 아모센스 Magnetic Shielding Sheet for Wireless Power Charger, Manufacturing Method thereof, and Receiving Apparatus for Wireless Power Charger Using the Same

Similar Documents

Publication Publication Date Title
US10280490B2 (en) Mixed magnetic powders and the electronic device using the same
US11723182B2 (en) Shielding film and method for producing a shielding film
EP3553799B1 (en) Method to produce an iron core
JP2004524672A (en) Stamped bulk amorphous metal magnetic parts
JP2008213410A (en) Laminated sheet and manufacturing method of laminate
CN104616878B (en) A kind of miniature molding inductance element and its manufacturing method
CN108122669B (en) Processing method of magnetic material for electromagnetic shielding
KR101971090B1 (en) Receiving antennas and wireless power receiving apparatus comprising the same
JPWO2010140367A1 (en) Magnetic sheet with mount and method of manufacturing electronic component using the same
KR20180102528A (en) The method of manufacturing shilding sheet and shilding sheet
KR101395800B1 (en) Method for refining magnetic domain of steel sheets and oriented electrical steel sheets manufacutred by the same
KR101663533B1 (en) Manufacturing method of magnetic shielding sheet and flake device for this
KR101675146B1 (en) Manufacturing method of magnetic shielding sheet and flake device for this
JP2007221869A (en) Laminate
KR102100814B1 (en) The method of manufacturing shilding sheet
CN108481877B (en) Fragmentation treatment process of magnetic material for electromagnetic shielding
KR101491094B1 (en) Method for refining magnetic domain of steel sheets and oriented electrical steel sheets manufacutred by the same
CN110581014A (en) Anti-saturation magnetic-isolating sheet and preparation method thereof
KR20200067294A (en) Manufacturing method of magnetic shielding sheet for wireless power charger and using the same
CN109741928B (en) Manufacturing method of magnetic field shielding sheet and terminal
JP2020149997A (en) Manufacturing method of dust core
Schneider et al. Relation of joining parameters of stator core production and iron loss
JP2001338824A (en) Method of manufacturing laminated iron core
KR101708040B1 (en) Magnetic sheet and manufacturing method thereof
KR101727959B1 (en) Manufacturing method of magnetic shielding sheet

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20191104

Year of fee payment: 4