KR20240013418A - The method of manufacturing shilding sheet and shilding sheet - Google Patents

Abstract

A method of manufacturing a magnetic field shielding sheet is provided. A method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention includes preparing a magnetic sheet made of a magnetic material containing a metal component and having a predetermined area; and separating the magnetic sheet into a plurality of pieces by passing the magnetic sheet between a pair of rollers, wherein the step of separating the magnetic sheet into a plurality of pieces protrudes at a certain height along the circumferential surface of the roller. This is performed through a plurality of unit patterns forming a polygonal shape, wherein each of the plurality of unit patterns has a plurality of straight blades so that both ends are not connected to each other and the vertices are open to form a polygonal shape. It may be arranged.

Description

Magnetic field shielding sheet manufacturing method and magnetic field shielding sheet {The method of manufacturing shielding sheet and shielding sheet}

The present invention relates to a method of manufacturing a magnetic field shielding sheet and a magnetic field shielding sheet.

Since near-field communication (NFC) and wireless charging are essentially non-contact transmission methods, a magnetic field shielding sheet made of magnetic material is used to focus the magnetic field generated from the primary coil of the transmitting device to the secondary coil of the receiving device.

These magnetic field shielding sheets typically use magnetic materials such as amorphous metal ribbons, ferrite, or polymer sheets containing magnetic powder.

At this time, the magnetic field shielding sheet is separated into multiple pieces to reduce loss due to eddy current.

For example, the magnetic field shielding sheet may be separated into multiple pieces through a flake process.

That is, the flake process can separate the magnetic field shielding sheet into multiple pieces by passing the magnetic field shielding sheet between a metal roller with a spherical ball on the outer surface and a rubber roller disposed opposite the metal roller.

However, in the flake process using a metal roller equipped with a spherical ball on the outer surface, the magnetic field shielding sheet is separated into a plurality of pieces by pressing force as it passes between a pair of rollers, but the plurality of pieces formed through the flake process are irregular. The size of each piece is also formed at random.

Accordingly, the flake-treated magnetic field shielding sheet does not have a uniform permeability over the entire area, but has a problem in that the permeability varies depending on the location.

The present invention was conceived in consideration of the above points, and its purpose is to provide a method of manufacturing a magnetic field shielding sheet and a magnetic field shielding sheet in which the separated pieces can be separated into similar shapes.

In order to achieve the above-described object, the present invention includes the steps of preparing a magnetic sheet made of a magnetic material containing a metal component and having a predetermined area; and separating the magnetic sheet into a plurality of pieces by passing the magnetic sheet between a pair of rollers, wherein the step of separating the magnetic sheet into a plurality of pieces protrudes at a certain height along the circumferential surface of the roller. This is performed through a plurality of unit patterns forming a polygonal shape, wherein each of the plurality of unit patterns has a plurality of straight blades so that both ends are not connected to each other and the vertices are open to form a polygonal shape. A method of manufacturing an arranged magnetic field shielding sheet is provided.

Additionally, among the plurality of unit patterns, two neighboring unit patterns may share one or more straight blades to form a polygonal shape.

In addition, the unit pattern may form a polygonal slit in the magnetic sheet with an open vertex corresponding to the shape of the unit pattern, and the magnetic sheet may have a polygonal slit with an open vertex formed through the unit pattern. The vertex may be separated into a plurality of pieces through irregular cracks caused by open polygonal slits.

At this time, the polygonal slit with open vertices may include a plurality of linear slits, and each of the polygonal slits with open vertices formed through the plurality of unit patterns may form one or more linear slits in other neighboring slits. The vertices can share an open polygonal slit.

In addition, the pair of rollers may include a first roller including a plurality of unit patterns arranged adjacent to each other while protruding at a certain height along the circumferential surface, and a second roller disposed opposite to the first roller. there is.

Additionally, the magnetic sheet may be a ribbon sheet of amorphous alloy or nano-crystal grain alloy.

Additionally, the magnetic sheet may be a multi-layer sheet in which a plurality of the ribbon sheets are stacked in multiple layers with an adhesive layer as a medium.

Meanwhile, the present invention is a magnetic field shielding sheet formed separately into a plurality of pieces, including a sheet body made of a magnetic material containing a metal component; Polygonal slits with open vertices formed on the sheet body with open vertices through a plurality of straight slits whose ends are not connected to each other; and irregular cracks caused by the plurality of straight slits, wherein the sheet body is divided into a plurality of pieces formed through polygonal slits and irregular cracks with open vertices. Shielding sheets are provided.

In addition, each of the plurality of pieces may be defined by irregular cracks connecting a polygonal slit with one open vertex and a plurality of straight slits constituting the polygonal slit with one open vertex. .

Additionally, each of the plurality of pieces may share one or more straight slits constituting polygonal slits with open vertices with other neighboring pieces.

Additionally, the sheet body may be a ribbon sheet of amorphous alloy or nano-crystal grain alloy.

In addition, the sheet main body may be a multi-layer sheet in which a plurality of the ribbon sheets are stacked in multiple layers with an adhesive layer as a medium.

According to the present invention, the separated pieces can be configured to have similar shapes and sizes, so that the deviation in permeability depending on the location with respect to the entire area of the shielding sheet can be reduced.

In addition, according to the present invention, the size of the pieces can be adjusted to various sizes while having similar shapes and sizes, so that the shielding sheet can be implemented to have various permeability depending on the size of the pieces.

1 is a flowchart showing a method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention;
Figure 2 is a diagram schematically showing the process in which a magnetic sheet passes between a pair of rollers in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention;
Figure 3 is a cross-sectional view schematically showing the process in which a magnetic sheet is pressed by a first roller in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention;
Figure 4 is a view showing one form of a first roller that can be used in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention;
Figure 5 is a view showing the unfolded state of the pattern sheet coupled to the first roller in Figure 4;
FIGS. 6A to 6D are views showing various shapes of unit patterns that can be applied to the pattern sheet in FIG. 5;
Figure 7 is a view showing a state in which a magnetic sheet passes through a pair of rollers in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention;
Figure 8 is an enlarged view of portion "A" in Figure 7;
Figures 9a and 9b are enlarged photographs showing a state in which a magnetic sheet passes through a pair of rollers in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention, and Figure 9a shows the length of a straight blade constituting a unit pattern. Figure 9b is an enlarged photograph showing the case where is 1 mm, Figure 9b is an enlarged photograph showing the case where the length of the straight blade constituting the unit pattern is 2 mm,
Figure 10 is a view showing a magnetic field shielding sheet manufactured through a method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention;
Figure 11 is an enlarged view of part "B" in Figure 10, and
Figures 12a to 12d are views showing various shapes of polygonal slits with open vertices that can be applied to a magnetic field shielding sheet according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted, and identical or similar components are given the same reference numerals throughout the specification.

The method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention includes preparing a magnetic sheet having a predetermined area as shown in FIG. 1 (S1) and separating the magnetic sheet into a plurality of pieces (P). It includes a step (S2).

The step of preparing the magnetic sheet (S1) may be a step of preparing the magnetic sheet (A), which is the base material of the final product, the shielding sheet 100.

In this case, the magnetic sheet 10 may have the same area as the final product, the shielding sheet 100, but the shielding sheet (100) can be produced from one magnetic sheet 10. It can have a relatively larger area than 100).

That is, the shielding sheet 100 can be processed from the magnetic sheet 10 to a predetermined size to have an appropriate size suitable for the intended use and purpose.

This magnetic sheet 10 may be made of a magnetic material so that the final product, the shielding sheet 100, can shield the magnetic field generated from an antenna performing a predetermined function and focus it in a desired direction.

In addition, the magnetic sheet 10 is separated into a plurality of pieces P by the pressing force applied from the pair of rollers 20 and 30 in the process of passing through the pair of rollers 20 and 30, which will be described later. It may be made of a material containing a metal component.

For example, the magnetic sheet 10 may be a ribbon sheet 12 of an amorphous alloy or nano-crystal grain alloy.

At this time, the magnetic sheet 10 may be provided as a single-layer ribbon sheet 12, but as shown in the enlarged view of FIG. 2, it is a multi-layer sheet in which a plurality of ribbon sheets 12 are stacked in multiple layers with an adhesive layer as a medium. It can be.

Accordingly, the shielding sheet 100 finally produced from the magnetic sheet 10 may be composed of a multilayer sheet in which a plurality of ribbon sheets 112 are stacked in multiple layers with an adhesive layer as shown in FIG. 10. .

In addition, the magnetic sheet (A) may further include separate protective films (14a, 14b) attached to at least one of the upper and lower surfaces through an adhesive layer (not shown). Such protective films (14a, 14b) can prevent the separated pieces (P) from being separated to the outside even if the magnetic sheet (10) is separated into a plurality of pieces (P).

However, the material of the magnetic sheet 10 is not limited to this, and any material that contains a magnetic material can be used. That is, the magnetic sheet 10 may be a ferrite sheet obtained by sintering ferrite or a magnetic sheet obtained by mixing and molding soft magnetic powder and a binder.

In addition, the magnetic sheet 10 may be a composite sheet manufactured by mixing soft magnetic powder and binder resin. Like permalloy, Ni and Fe elements are mixed in a predetermined ratio, or Fe and Co elements are mixed in a predetermined ratio. It may also be a mixed sheet.

The step (S2) of separating the magnetic sheet into a plurality of pieces is to separate the magnetic sheet 10 into a plurality of pieces (P) by forming a plurality of polygonal slits (UP) in the magnetic sheet 10. can do.

That is, the magnetic sheet 10 can pass between a pair of rollers 20 and 30, and the plurality of polygonal slits UP are formed in the process of passing the pair of rollers 20 and 30. It may be formed on the magnetic sheet 10 side.

In this case, in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention, the step (S2) of separating the magnetic sheet into a plurality of pieces is performed by applying the magnetic sheet 10 to the pair of rollers in a roll-to-roll manner. It can be passed between (20,30).

In addition, the plurality of polygonal slits UP may be formed on the magnetic sheet 10 by a punching method through a plurality of unit patterns U provided on the sides of the pair of rollers 20 and 30. .

In addition, the plurality of unit patterns (U) may be provided to have the same shape and size, and may be provided on the side of the pair of rollers (20, 30) to pressurize the entire area of the magnetic sheet (10). It can be provided.

Accordingly, the magnetic sheet 10 that has passed through the pair of rollers 20 and 30 can be separated into a plurality of pieces P having a similar shape and size to the plurality of unit patterns U. Each piece (P) formed on the magnetic sheet 10 through the plurality of unit patterns (U) may have a shape and size similar to each other.

That is, compared to the conventional flake method of separating the magnetic sheet into a plurality of pieces through a metal roller equipped with a spherical ball on the outer surface, the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention uses the magnetic sheet (10) While being formed separately into a plurality of pieces (P), the plurality of pieces (P) constituting the magnetic sheet 10 may have similar shapes and sizes.

Accordingly, even if the magnetic field shielding sheet 100 manufactured through the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention is formed separately into a plurality of pieces (P), each piece constituting the magnetic field shielding sheet 100 Since the shapes and sizes of the pieces P are similar, the magnetic field shielding sheet 100 may not have a significant deviation in permeability for each location over the entire area.

That is, the magnetic field shielding sheet 100 manufactured through the manufacturing method of the magnetic field shielding sheet according to an embodiment of the present invention may have similar magnetic permeability regardless of location.

To this end, the pair of rollers 20 and 30 may include a first roller 20 and a second roller 30 disposed opposite to the first roller 20, as shown in FIG. 2. The first roller 20 may include a plurality of unit patterns U arranged adjacent to each other while protruding at a certain height along the circumferential surface.

In this case, each of the plurality of unit patterns (U) may include a plurality of straight blades (24b), and the plurality of straight blades (24b) constituting one unit pattern (U) have a polygonal shape. Can be arranged to form.

That is, the plurality of linear blades 24b may be provided to protrude outward at a certain height along the circumferential surface of the first roller 20, as shown in FIG. 3, and the plurality of linear blades 24b Can be grouped as shown in FIG. 5 to form one unit pattern (U).

For example, as shown in FIGS. 5 and 6A, each unit pattern U may be formed into a rectangular shape through four straight blades 24b.

As another example, each unit pattern (U) may be formed in a diamond shape through four straight blades 24b as shown in Figure 6b, or three straight blades (24b) as shown in Figure 6c. It may be formed into a triangular shape through 24b), or it may be formed into a honeycomb shape through six straight blades 24b, as shown in FIG. 6D.

However, the shape of each unit pattern U is not limited to the above-described shape, and as long as it is polygonal, it can be changed to various known shapes.

Accordingly, as shown in FIGS. 2 and 3, when the magnetic sheet 10 passes between the first roller 20 and the second roller 30, the plurality of sheets provided on the first roller 20 Each of the unit patterns (U) can be pressed by punching the magnetic sheet 10 using straight blades 24b, and as shown in FIGS. 7 and 8 on the magnetic sheet 10 side. A polygonal slit (UP) having a shape corresponding to the unit pattern (U) may be formed.

Here, the plurality of unit patterns (U) may be formed integrally with the first roller 20, or may be provided on a separate pattern sheet 24.

For example, as shown in FIG. 4, the first roller 20 may include a roller body 22 and a pattern sheet 24 detachably coupled to the roller body 22, and the plurality of The unit patterns (U) may be formed to protrude at a certain height on one surface of the pattern sheet 24.

That is, the plurality of blades 24b constituting each unit pattern U may be formed to protrude at a certain height from the plate-shaped base member 24a having a predetermined area, and the plurality of straight blades 24b may be They may be grouped to form one unit pattern (U), and the plurality of blades 24b constituting one unit pattern (U) may be arranged to form a polygonal shape.

In addition, a plurality of unit patterns (U) in which a plurality of straight blades (24b) are grouped into one may be formed on one surface of the base member (24a).

In this case, the base member 24a of the pattern sheet 24 may surround the peripheral surface of the roller body 22 so that the plurality of straight blades 24b are exposed to the outside.

Accordingly, when the magnetic sheet 10 passes between the first roller 20 and the second roller 30, the plurality of straight blades 24b press the magnetic sheet 10 in a punching manner. A plurality of linear slits (UP1, UP2, UP3, UP4) corresponding to the plurality of linear blades 24b may be formed on the magnetic sheet 10 side.

At this time, the plurality of straight blades 24b constituting each unit pattern U may be arranged to form a polygonal shape with both ends not connected to each other. Through this, each unit pattern U can be formed into a polygonal shape with open vertices through the plurality of straight blades 24b.

Additionally, each of the plurality of unit patterns U may be formed into a polygonal shape having the same size. Through this, polygonal unit patterns U with open vertices having the same shape and size can be arranged along the circumferential surface of the first roller 20.

In addition, the plurality of straight blades 24b forming one unit pattern U may be formed to have the same width and length. Preferably, the plurality of straight blades 24b forming one unit pattern U may be arranged so that interior angles of a polygon with open vertices have the same angle. Through this, the polygonal unit patterns (U) with open vertices may be formed into equigonal polygonal shapes such as squares, equilateral triangles, or regular hexagons.

In addition, among the plurality of unit patterns U, two neighboring unit patterns U1 and U2 may share one or more straight blades 24b to form a polygonal shape with open vertices. Through this, polygonal unit patterns U with open vertices having the same shape and size can be continuously arranged along the circumferential surface of the first roller 20.

Through this, each of the plurality of unit patterns (U) can form a polygonal slit (UP) in the magnetic sheet 10 with an open vertex corresponding to the shape of the unit pattern (U). That is, as shown in FIG. 8, the polygonal slit UP with an open vertex may include a plurality of straight slits UP1, UP2, UP3, and UP4 corresponding to the plurality of straight blades 24b. Among the polygonal slits (UP) with a plurality of open vertices formed through the plurality of unit patterns (U), each of the polygonal slits (UP) with two adjacent vertices open is one or more straight lines. The slit (UP3) can be shared with each other.

For example, as shown in FIG. 6A, each of the plurality of straight blades 24b constituting one unit pattern U is the same without being connected to each other along the width or length direction of the pattern sheet 24. They may be spaced apart from each other, and the plurality of straight blades 24b may be arranged to form a polygonal shape without being connected to each other at both ends.

Additionally, each of the two neighboring unit patterns U1 and U2 may share one or more straight blades 24b to form a polygonal shape with open vertices.

For this reason, in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention, the magnetic sheet 10 is punched while the plurality of straight blades 24b constituting the unit pattern U form a polygonal shape. Even when pressed, the magnetic sheet 10 is separated into a plurality of pieces (P) through the unit pattern (U), and each of the separated pieces (P) constituting the magnetic sheet 10 has a complete polygonal shape. It is possible to prevent the sheet from being punched out and separated from the magnetic sheet 10.

In addition, in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention, each of the two neighboring unit patterns (U1, U2) shares one or more straight blades (24b) to form a polygonal shape with open vertices. Because the magnetic sheet 10 is formed, the magnetic sheet 10 can be pressed through the unit pattern U having the same size and shape over the entire area.

Through this, since the plurality of straight blades 24b constituting the unit pattern U press the magnetic sheet 10 in a punching manner while forming a polygonal shape with open vertices, the unit pattern U Each of the plurality of pieces (P) separated through each other may have a shape substantially similar to the unit pattern (U) and may have approximately the same size as the unit pattern (U).

For this reason, even if the magnetic sheet 10 is formed separately into a plurality of pieces through the plurality of unit patterns (U), each piece (P) constituting the magnetic sheet 10 has the same shape and size. Since they are similar and can be arranged continuously over the entire area of the magnetic sheet 10, the magnetic sheet 10 may not have a significant deviation in permeability from position to position over the entire area.

In addition, in the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention, each of the plurality of unit patterns (U) has a plurality of straight blades (24b) arranged to form a polygonal shape with open vertices, so that there are two Compared to the case where the ends of the straight blades 24b are connected to each other to form the vertex, it is possible to prevent irregular cracks from occurring intensively at the vertex.

For this reason, the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention is similar to the case where the ends of the two straight blades 24b are connected to each other to form a vertex, and the unit pattern U is formed at the vertex. It is possible to minimize the generation of irregularly formed pieces that are very small in size due to the irregular cracks (C) compared to the pieces formed by the cracks (C).

Through this, the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention can minimize the number of irregular pieces that are generated irregularly while being very small in size, thereby reducing the variation in permeability depending on the location due to the irregular pieces. It can prevent it from getting bigger.

At this time, the magnetic sheet 10 is divided into a plurality of pieces (P) through the plurality of unit patterns (U) in the process of passing through the first roller 20 and the second roller 30 as described above. can be separated into

That is, the magnetic sheet 10 has a polygonal slit (UP) with an open vertex formed through the unit pattern (U) and an irregular crack (C) caused by the polygonal slit (UP) with an open vertex. ) can be separated into a plurality of pieces (P).

In other words, the magnetic sheet 10 is in direct contact with the plurality of straight blades 24b constituting the unit pattern U, and straight slits UP1 are formed by the plurality of straight blades 24b. UP2, UP3, UP4) and irregular cracks (C) formed from the linear slits (UP1, UP2, UP3, UP4) by the pressing force applied from the plurality of linear blades (24b). It can be included.

In this case, the irregular cracks (C) may or may not connect the two adjacent straight slits (UP1, UP2, UP3, UP4) to each other.

In addition, the straight slits (UP1, UP2, UP3, UP4) directly formed by the plurality of straight blades (24b) are irregular cracks caused by the straight slits (UP1, UP2, UP3, UP4). It may be formed to have a relatively thicker thickness or wider width than (C).

Accordingly, a plurality of linear slits (UP1, UP2, UP3, When UP4) are connected to each other through the irregular cracks C, a piece P having a shape approximately similar to the polygonal slit UP may be formed on the magnetic sheet 10 side.

As a result, the magnetic sheet 10 or the shielding sheet 100 separated from the magnetic sheet 10 is formed into a plurality of polygonal slits (UP) with open vertices and irregular cracks caused therefrom. It can be separated into pieces (P).

At this time, the plurality of linear slits (UP1, UP2, UP3, UP4) constituting the polygonal slit (UP) with open vertices are similar to the plurality of linear blades (24b) constituting the unit pattern (U). At least one straight slit (UP1, UP2, UP3, UP4) can be shared with each other.

That is, among polygonal slits (UP) with open vertices formed on the magnetic sheet 10 by the plurality of unit patterns (U), polygonal slits (UP) have two adjacent vertices open. ) Each can share one or more straight slits (UP1, UP2, UP3, UP4) with each other.

In other words, in the magnetic sheet 10, a plurality of linear slits (UP1, UP2, UP3, UP4) constituting a polygonal slit (UP) whose vertices are open and the linear slits (UP1, UP2, UP3, UP4) Among the pieces formed by irregular cracks (C) induced by ), each of the neighboring pieces (P1, P2) shares one or more straight slits (UP1, UP2, UP3, UP4) with other neighboring pieces. can do.

In addition, the plurality of pieces P constituting the magnetic sheet 10 may have substantially similar sizes and shapes.

For example, as shown in FIGS. 8, 9A, and 9B, the magnetic sheet 10 may be formed separately into a plurality of pieces (P) through the plurality of unit patterns (U), and the plurality of pieces (P) may be separated into a plurality of pieces (P). The pieces (P) are formed from a plurality of linear slits (UP1, UP2, UP3, UP4) constituting a polygonal slit (UP) with open vertices and the linear slits (UP1, UP2, UP3, UP4). It can be defined by irregular cracks (C).

In this case, each of the two neighboring pieces (P1, P2) may include a polygonal slit (UP) with an open vertex defined by four straight slits (UP1, UP2, UP3, UP4). Among the four linear slits (UP1, UP2, UP3, UP4), one linear slit (UP3) can form a boundary dividing two adjacent pieces (P1, P2).

Accordingly, the magnetic sheet 10 or the shielding sheet 100 separated from the magnetic sheet 10 is sized and It may be separated into a plurality of pieces P that are approximately similar in shape, and the magnetic sheet 10 or the shielding sheet 100 separated from the magnetic sheet 10 may be divided into a plurality of pieces P that are approximately similar in size and shape with respect to the entire area. The pieces P may be formed separately so that they are arranged sequentially.

Meanwhile, the magnetic sheet 10 formed separately into a plurality of pieces P through the above-described manufacturing method may further include the step of cutting the magnetic sheet 10 separately formed into a plurality of pieces into a predetermined size. .

In other words, the step of cutting the magnetic sheet 10 into a predetermined size may be a step of processing the magnetic sheet 10 into an appropriate size suitable for the intended use and purpose.

Accordingly, the method of manufacturing a magnetic field shielding sheet according to an embodiment of the present invention can produce a plurality of shielding sheets having a predetermined size from one magnetic sheet 10.

The magnetic field shielding sheet 100 manufactured through the method for manufacturing a magnetic field shielding sheet according to an embodiment of the present invention described above may be implemented in the form of FIG. 10.

That is, the magnetic field shielding sheet 100 may include a sheet body 110, and the sheet body 110 may be separately formed into a plurality of pieces P.

In this case, the magnetic field shielding sheet 100 may include protective films 120a and 120b attached to at least one of the upper and lower surfaces of the sheet main body 110 through an adhesive layer, and the sheet main body 110. (110) may be made of a ribbon sheet of amorphous alloy or nano-crystal grain alloy, and the sheet body 110 may be a single-layer ribbon sheet or a multi-layer ribbon sheet in which a plurality of ribbon sheets 112 are stacked through an adhesive layer. there is.

Here, the contents of the magnetic sheet 10 described above can be applied as is to the sheet body 110.

At this time, the sheet body 110 is divided into a plurality of pieces (P) through polygonal slits (UP) with open vertices and irregular cracks (C) caused by the polygonal slits (UP) with open vertices. ) can be formed separately.

That is, the plurality of pieces P constituting the sheet body 110 include polygonal slits UP with open vertices and a plurality of linear slits constituting the polygonal slits UP with open vertices. It can be formed through irregular cracks (C) caused by (UP1, UP2, UP3, UP4).

Here, each of the polygonal slits UP with open vertices may include a plurality of linear slits UP1, UP2, UP3, UP4, and constitutes a polygonal slit UP with one open vertex. The plurality of linear slits UP1, UP2, UP3, and UP4 may be formed so that both ends are not connected to each other.

In this case, the irregular cracks (C) caused by the plurality of straight slits (UP1, UP2, UP3, UP4) cause two adjacent straight slits (UP1, UP2, UP3, UP4). They may or may not be connected to each other.

In addition, the straight slits (UP1, UP2, UP3, UP4) constituting the polygonal slit (UP) with open vertices have irregular cracks caused by the straight slits (UP1, UP2, UP3, UP4). It may be formed to have a relatively thicker thickness or wider width than (C).

Accordingly, when a plurality of linear slits (UP1, UP2, UP3, UP4) constituting a polygonal slit (UP) with open vertices are connected to each other through the irregular cracks (C), the sheet body 110 may be formed separately into pieces P having a shape substantially similar to the polygonal slit UP or the unit pattern U.

At this time, the plurality of linear slits (UP1, UP2, UP3, UP4) constituting the polygonal slit (UP) with open vertices may share at least one linear slit (UP3).

That is, among the polygonal slits UP with a plurality of open vertices formed on the sheet body 110, each of the polygonal slits UP with two adjacent vertices open has one or more straight slits UP3. You can share it with each other.

In other words, a plurality of linear slits (UP1, UP2, UP3, UP4) constituting a polygonal slit (UP) whose vertex is open in the sheet body 110 and the linear slits (UP1, UP2, UP3, UP4) ), each of the neighboring pieces (P1, P2) of the pieces formed by the irregular cracks (C) induced by , It can be shared with P2).

In addition, the plurality of pieces P constituting the sheet body 110 may have substantially similar sizes and shapes.

For example, as shown in Figure 11, the sheet body 110 may be separately formed into a plurality of pieces (P), and the plurality of pieces (P) have a polygonal slit (UP) with an open vertex. It can be defined by a plurality of straight slits (UP1, UP2, UP3, UP4) constituting and irregular cracks (C) induced from the straight slits (UP1, UP2, UP3, UP4).

In this case, each of the two neighboring pieces (P1, P2) may include a polygonal slit (UP) with an open vertex defined by four straight slits (UP1, UP2, UP3, UP4). Among the four straight slits (UP1, UP2, UP3, UP4), one straight slit (UP1, UP2, UP3, UP4) can form a border dividing two neighboring pieces (P1, P2). there is.

That is, as shown in FIG. 11, each of the plurality of linear slits (UP1, UP2, UP3, UP4) constituting a polygonal slit (UP) with one open vertex is formed in the width direction or direction of the sheet body 110. They may be formed to be spaced apart at similar intervals without being connected to each other along the longitudinal direction, and the plurality of linear slits (UP1, UP2, UP3, UP4) may be formed to form a polygonal shape without being connected to each other at both ends. .

Additionally, each of the two adjacent polygonal slits UP may share one or more linear slits UP1, UP2, UP3, and UP4 to form a polygonal shape with open vertices.

Accordingly, the sheet body 110 can be separated into a plurality of pieces (P) of approximately similar size and shape through polygonal slits (UP) with open vertices and irregular cracks caused therefrom. In addition, the sheet body 110 may be formed separately so that a plurality of pieces P of approximately similar size and shape are sequentially arranged over the entire area.

For this reason, even if the sheet body 110 is formed separately into a plurality of pieces (P) in the magnetic field shielding sheet 100 according to an embodiment of the present invention, each piece constituting the sheet body 110 (P ) Because the shape and size of the magnetic field shielding sheet 100 are similar, the magnetic field shielding sheet 100 can prevent the difference in permeability from position to position over the entire area from increasing.

That is, the magnetic field shielding sheet 100 according to an embodiment of the present invention may have similar magnetic permeability regardless of location.

Meanwhile, each of the plurality of polygonal slits UP defining each of the plurality of pieces P may include a plurality of linear slits UP1, UP2, UP3, and UP4 as described above, and one The plurality of linear slits (UP1, UP2, UP3, UP4) constituting the polygonal slit (UP) may be formed to form a polygonal shape with open vertices.

For example, as shown in FIGS. 12A to 12D, each polygonal slit UP may be formed in various shapes.

That is, as shown in FIG. 12A, each polygonal slit UP may be formed in a rectangular shape through four straight slits UP1, UP2, UP3, UP4, and as shown in FIG. 12B, 4 It may be formed into a diamond shape through two straight slits (UP1, UP2, UP3, UP4). In addition, each polygonal slit (UP) may be formed in a triangular shape through three straight slits (UP1, UP2, UP3, UP4) as shown in FIG. 12C, and 6 as shown in FIG. 12D. It may be formed into a honeycomb shape through two straight slits (UP1, UP2, UP3, UP4).

However, the shape of each polygonal slit UP is not limited to the above-described shape, and as long as it is polygonal, it can be changed to various known shapes.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiment presented in the present specification, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same spirit. , other embodiments can be easily proposed by change, deletion, addition, etc., but this will also be said to be within the scope of the present invention.

10: magnetic sheet 12: ribbon sheet
14a, 14b: Protective film P, P1, P2: Piece
20: first roller 22: roller body
24: pattern sheet 24a: base member
24b: Straight blade U, U1, U2: Unit pattern
30: Second roller C: Irregular crack
100: magnetic field shielding sheet 110: sheet body
112: Ribbon sheet 120a, 120b: Protective film
UP: Polygonal slits with open vertices UP1, UP2, UP3, UP4: Straight slits

Claims (12)

Preparing a magnetic sheet made of a magnetic material containing a metal component and having a predetermined area; and
A step of separating the magnetic sheet into a plurality of pieces by passing the magnetic sheet between a pair of rollers,
The step of separating into a plurality of pieces,
This is performed through a plurality of unit patterns that protrude at a certain height along the circumferential surface of the roller and form a polygonal shape,
A method of manufacturing a magnetic field shielding sheet in which a plurality of straight blades are arranged so that each of the plurality of unit patterns forms a polygonal shape with open vertices while both ends are not connected to each other. According to paragraph 1,
A method of manufacturing a magnetic field shielding sheet in which two neighboring unit patterns among the plurality of unit patterns share one or more straight blades to form a polygonal shape. According to paragraph 1,
The unit pattern forms a polygonal slit in the magnetic sheet with an open vertex corresponding to the shape of the unit pattern,
A method of manufacturing a magnetic field shielding sheet in which the magnetic sheet is separated into a plurality of pieces through polygonal slits with open vertices formed through the unit pattern and irregular cracks caused by the polygonal slits with open vertices. . According to paragraph 3,
The polygonal slit with open vertices includes a plurality of linear slits,
A method of manufacturing a magnetic field shielding sheet in which each of the plurality of polygonal slits with open vertices formed through the plurality of unit patterns shares one or more straight slits with other adjacent polygonal slits with open vertices. According to paragraph 1,
The pair of rollers is,
A method of manufacturing a magnetic field shielding sheet including a first roller including a plurality of unit patterns arranged adjacent to each other while protruding at a certain height along the circumferential surface, and a second roller disposed to face the first roller. According to paragraph 1,
A method of manufacturing a magnetic field shielding sheet, wherein the magnetic sheet is a ribbon sheet of amorphous alloy or nano-crystal grain alloy. According to clause 6,
A method of manufacturing a magnetic field shielding sheet, wherein the magnetic sheet is a multilayer sheet in which a plurality of the ribbon sheets are stacked in multiple layers with an adhesive layer as a medium. A magnetic field shielding sheet formed separately into a plurality of pieces,
A sheet body made of a magnetic material containing a metal component;
Polygonal slits with open vertices formed on the sheet body with open vertices through a plurality of straight slits whose ends are not connected to each other; and
Includes irregular cracks caused by the plurality of linear slits,
The sheet body is a magnetic field shielding sheet that is separated into a plurality of pieces formed through polygonal slits and irregular cracks with the vertices open. According to clause 8,
Each of the plurality of pieces is defined by irregular cracks connecting a polygonal slit with one vertex open and a plurality of straight slits constituting the polygonal slit with one vertex open. According to clause 8,
A magnetic field shielding sheet in which each of the plurality of pieces shares one or more straight slits constituting polygonal slits with open vertices with other neighboring pieces. According to clause 8,
The sheet body is a magnetic field shielding sheet that is a ribbon sheet of amorphous alloy or nano-crystal grain alloy. According to clause 11,
The sheet body is a magnetic field shielding sheet that is a multi-layer sheet in which a plurality of the ribbon sheets are stacked in multiple layers with an adhesive layer as a medium.

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