KR20170062414A - Magnetic shielding unit and multi-function complex module comprising the same - Google Patents

Abstract

A magnetic shielding unit is provided. The magnetic field shielding unit according to an embodiment of the present invention includes a first magnetic shielding layer formed of fragments of a Fe-based alloy crushed in order to improve the flexibility of the shielding unit and to reduce eddy currents, A first sheet that improves adhesion of the first sheet; And a second sheet having a second magnetic shielding layer formed of fragments of ferrite broken to improve the flexibility of the shielding unit to improve antenna characteristics for short-range communication, wherein the average sheet size of the fragments of the Fe- And a specific expression for the average grain size of the fragments of the ferrite is satisfied. According to the present invention, the transmission and reception distances and the transmission and reception efficiency of the signal are remarkably improved, and at the same time, the antenna is realized with a very slim thickness so as to improve the characteristics of heterogeneous antennas having different frequency bands as the operating frequency.

Description

Magnetic shielding unit and multi-functional composite module comprising same

The present invention relates to a magnetic field shielding unit, and more particularly, to a magnetic shielding unit having a slimened thickness, which is complex to improve characteristics of heterogeneous antennas having different frequency bands at different operating frequencies, and a multifunction composite module .

Near Field Communication (NFC) is an RFID technology that transmits data between terminals at a distance of 10cm by using a non-contact type short-range wireless communication module using a frequency band of 13.56Mhz, Traffic, access control, locks, etc. As a feature of the NFC, a terminal having a built-in tag can be operated in an active mode, which is an extension concept of existing RFID, so that not only a function as a tag but also a reader for reading a tag, Writer (WRITER), and P2P is possible between the terminal and the terminal. Accordingly, it is becoming common to mount a short range wireless communication module in a portable electronic device such as a mobile phone, a PDA (personal digital assistant), an iPad, a notebook computer, or a tablet PC so as to enable short range communication.

Further, in the case of the non-contact type wireless charging using the magnetic induction method, various functions are required as the power of the portable terminal increases, and as a technique for charging the user more conveniently, a portable terminal increasingly equipped with a non- Trend.

Such wireless charging is performed by a wireless power receiving module built in a portable terminal and a wireless power transmitting module for supplying power to the wireless power receiving module.

In addition, recently, a combo antenna unit including different kinds of antennas that perform the respective functions to perform both of the near-field wireless communication and the wireless charging of the portable terminal battery is installed in the portable terminal. Such a combo type antenna unit applies a magnetic field and generates a magnetic field of 100 kHz to several tens of MHz in the course of performing wireless LAN communication with nearby portable terminals or charging the battery.

The conventional magnetic bodies provided on the magnetic shield sheet have different permeability curves for different frequencies. For example, the permanent magnets provided in the magnetic shielding sheet can exhibit a high magnetic permeability and a relatively low loss magnetic permeability in a specific frequency band, but conversely can have a low permeability and a high loss permeability in other frequency bands. Therefore, in order to maximize the antenna function, a magnetic shielding sheet capable of exhibiting excellent magnetic properties (high permeability, low loss permeability) in the operating frequency band of the antenna should be selected.

For example, the short-range wireless communication and the wireless charging use different frequency bands for transmission and reception of data signals or power signals. Specifically, the short-range wireless communication uses 13.56 MHz And the wireless charging uses the frequency band of 10 to 400 kHz for transmission and reception of the wireless power signal.

Since the gap between the frequency bands used in the above two functions is very wide, the magnetic materials developed until now cover all the frequency bands of 10 to 400 kHz and 13.56 MHz as a single material and exhibit excellent magnetic properties (high permeability and low loss permeability) Therefore, a magnetic shielding sheet is realized by providing two types of magnetic materials, for example, an amorphous alloy and ferrite, each of which exhibits excellent magnetic characteristics at each desired frequency.

However, the amorphous alloy has a very large loss due to eddy currents. In addition, the heat-treated amorphous alloy and ferrite tend to be fragile and fragile and fragile. Particularly, in recent portable electronic devices, there is a tendency that a magnetic shielding sheet to be provided is also thinned due to the tendency to be small and thin. In such a trend, fragmentation due to high brittleness of the magnetic body has a fatal problem that makes it difficult to maintain the physical properties of the magnetic shielding sheet designed in the beginning.

Accordingly, it is possible to prevent the change of the magnetic permeability due to the crack of the magnetic material occurring in the process of manufacturing, storing, transporting and attaching the magnetic shielding sheet to the adherend surface in accordance with the tendency of the thin and small size of the portable electronic device, And it is urgent to develop a magnetic shielding material capable of satisfying heterogeneous antenna characteristics having a different operating frequency at a used frequency.

KR 10-2015-0010063 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a magnetic shielding unit capable of improving all kinds of antenna characteristics having different frequency bands at different operating frequencies, .

Another object of the present invention is to provide a magnetic shielding unit which is very thin and which is suitable for electronic apparatuses which are thin and small in size while satisfying all kinds of antenna characteristics of different types.

It is another object of the present invention to provide a multifunction composite module capable of improving the characteristics of each antenna and having improved durability even though heterogeneous antennas having different frequency bands at different operating frequencies are provided.

It is another object of the present invention to provide a portable device in which a signal receiving efficiency and a receiving distance are remarkably increased by including a multifunction composite module according to the present invention as a receiving module.

In order to solve the above-described problems, the present invention provides a shielding unit comprising a first magnetic shielding layer formed of fragments of an Fe-based alloy crushed to reduce flexibility and improve the flexibility of the shielding unit, A first sheet; And

And a second sheet having a second magnetic shielding layer formed of fragments of ferrite that are broken to improve the flexibility of the shielding unit,

Wherein the average particle diameter of the fragments of the Fe-based alloy and the average particle diameter of the fragments of the ferrite are 3 to 35,

[Equation 1]

According to an embodiment of the present invention, the first magnetic shielding layer may include a dielectric material that is at least partially embedded in a spacing space formed between adjacent ones of the fragments of the Fe-based alloy.

The first sheet may include a plurality of first magnetic shield layers stacked, and a dielectric layer may be interposed between the plurality of first magnetic shield layers.

The average particle diameter of the Fe-based alloy debris may be 0.5 to 700 mu m.

The fragments of the Fe-based alloy may satisfy 60% or more of the number of fragments having a particle diameter of less than 500 탆.

The first magnetic shield layer may have a thickness of 15 to 50 탆.

In addition, the first sheet may include 2 to 12 first magnetic shield layers.

Also, the second sheet may have a quality index value of 20 or more at a frequency of 13.56 MHz according to Equation (2).

&Quot; (2) "

The second magnetic shield layer may have a thickness of 30 to 600 mu m.

In addition, the average particle size of the single debris of the ferrite fragments may be 100 to 2100 탆.

In addition, the value according to Equation (1) may satisfy 3 to 25.

Further, the shape of the fragments with respect to any one or more of the Fe-based alloy fragments and the ferrite fragments may be irregular.

In addition, the number of the fragments of the Fe-based alloy having a curved shape, at least one side of which is not a straight line, may be 15% or more of the total number of the fragments of the Fe-based alloy included in the magnetic-

In addition, the number of the pieces of the ferrite pieces having a curved shape, at least one of which is not a straight line, may be 25% or more of the total number of ferrite pieces included in the magnetic shielding unit.

The first sheet and the second sheet may further include a protective member disposed on the uppermost magnetic shielding layer of the magnetic shielding layer provided on each sheet and an adhesive member disposed on the lower side of the lowermost magnetic shielding layer.

According to another aspect of the present invention, there is provided an antenna unit including a short-range communication antenna and a wireless power transmission antenna. And a magnetic field shielding unit according to the present invention, which is disposed on one side of the antenna unit to improve antenna characteristics and focus a magnetic flux toward the antenna unit.

According to an embodiment of the present invention, the antenna for wireless power transmission may be formed inside the antenna for short-range communication, and the first sheet of the magnetic-shielding unit may be arranged to correspond to the antenna for wireless power transmission.

The antenna unit may further include a magnetic security transmission (MST) antenna, and the first sheet of the magnetic shielding unit may be disposed on one surface of the antenna unit so as to correspond to the magnetic security transmission antenna.

Meanwhile, the present invention provides a portable device including a multifunctional composite module according to the present invention as a receiving module.

According to the present invention, the magnetic-field shielding unit is made complex so as to satisfy all of the heterogeneous antenna characteristics having different frequency bands as the operating frequency, thereby improving the transmission / reception distance and transmission / reception efficiency of the signal and improving the flexibility of the shielding unit. It is possible to prevent the permeability change in the operating frequency band of the antenna in advance and to prevent the deterioration of the durability due to the peeling of the shielding unit due to the excellent adhesion even when applied to an adherend having steps.

In addition, the magnetic shielding layer of the present invention can be realized with a very slim thickness, and is thus well suited for electronic devices with a tendency to be small and thin.

In addition, since the multifunction composite module according to the present invention can perform different functions such as short-range communication, wireless charging, information security transmission, etc. as a single module, it can be used for a mobile device, a smart appliance, The present invention can be widely applied to various electronic apparatuses.

FIG. 1 is a cross-sectional view of a magnetic shielding unit according to an embodiment of the present invention. FIG. 1 (a) is a view showing that a dielectric is filled in only a part of a space separating fragments of an Fe- In which a dielectric is filled in all of the spacing spaces of the electrodes,
2 is a cross-sectional view of a magnetic-field shielding unit according to an embodiment of the present invention,
FIG. 3 is a cross-sectional view of a magnetic-field shielding unit according to an embodiment of the present invention, in which two first magnetic-field-shielding layers are provided on a first sheet,
FIG. 4 is a schematic view of a shape of a fragment observed on a surface of a magnetic shielding layer in a magnetic shielding unit according to an embodiment of the present invention; FIG.
5A and 5B are diagrams showing the circumscribed circle diameter and the inscribed circle diameter of the fragments for evaluating the degree of variability of ferrite fragments having an irregular shape,
FIGS. 6A, 6B and 6C are schematic views illustrating a manufacturing process using a crushing apparatus used for manufacturing a magnetic shielding unit according to an embodiment of the present invention. FIG. 6A is a cross- 6B and 6C are views showing a manufacturing process using a crushing apparatus for crushing a sheet or a plate through a metal ball provided on a support plate,
FIG. 7 is a perspective view of a multifunction composite module according to an embodiment of the present invention, FIG. 7A is an exploded perspective view of the multifunction composite module, FIG. 7B is a sectional view of the multifunction composite module,
8 is an exploded perspective view of a multifunction composite module according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

The magnetic shielding unit 300 according to an embodiment of the present invention is formed by stacking a first sheet 100 and a second sheet 200 as shown in FIG. The first protective member 140 and the adhesive member 230 may be disposed on the upper and lower portions of the first and second sheets 100 and 200, respectively. Although not shown, the first sheet and the second sheet may not be stacked on each other, and the second sheet may be disposed outside the first sheet. With this structure, the thickness of the shielding unit can be further reduced.

The first sheet 100 may improve the antenna characteristics with a frequency band of 10 to 400 kHz as an operating frequency, and more preferably, may be an antenna for wireless power transmission. In addition, the antenna for performing a different function having the frequency band as the operating frequency may be, for example, an antenna for magnetic secure transmission.

The first sheet 100 has a first magnetic shielding layer 110 as shown in FIG. 1A, and the first magnetic shielding layer 110 is formed of fragments 110a of an Fe-based alloy and may include a dielectric (110b), which penetrates at least a portion (S _1, S ₃₎ of the spaced space (S) between the Fe-based alloy fragments (110a _1, 110a _2).

First, the magnetic shielding layer 110 is formed of fragmented Fe-based alloy fragments 110a for improving the flexibility of the shielding unit and reducing eddy currents. As shown in FIG. 1A, the magnetic shielding layer 110 is formed of fragmented Fe-based alloy fragments 110a, which significantly increases the resistivity when the single-piece shape is used, for example, Thereby suppressing the generation of eddy currents.

The resistivity value differs depending on the kind of the magnetic material, and the magnetic material having a remarkable resistivity such as ferrite has considerably less magnetic loss than the amorphous alloy due to the eddy current. On the other hand, the Fe-based alloy, which is a magnetic substance included in the first sheet, has a remarkably small specific resistance, so that the magnetic loss due to the eddy current can be extremely large. However, when the ribbon sheet is crushed, the fragmented Fe-based magnetic body fragments can remarkably reduce the magnetic loss due to the eddy current as the resistivity increases remarkably due to the existence of a space between the fragments, thereby reducing the permeability, The resulting inductance reduction of the antenna can be compensated.

On the other hand, the magnetic shielding layer 110 formed of the fragments 110a of the crushed Fe-based alloy may have excellent flexibility. This is because the ribbon sheet of an Fe-based alloy, for example, an Fe-based alloy, has a strong brittleness in the case of a ribbon sheet subjected to a heat treatment process to control the permeability, so that it can be easily broken when an impact is applied or bent.

However, the first sheet 100 included in the first embodiment of the present invention significantly improves the flexibility of the shielding unit as the Fe-based alloy ribbon sheet is crushed from the beginning and is provided in a fragmented state, so that even if the thickness of the shielding unit is reduced It is possible to suppress the possibility that cracks may further occur in the Fe-based alloy fragments due to the external force.

In addition, the Fe-based alloy included in one embodiment of the present invention may be a three-element alloy containing silicon (Si) and boron (B) in addition to iron (Fe) Chromium (Cr) for improving corrosion resistance, and cobalt (Co) for further improving the amorphous property.

The Fe-based alloy may be a five-element alloy containing iron (Fe), copper (Cu), and niobium (Nb) and further including silicon (Si) and boron (B). The copper improves the corrosion resistance of the Fe-based alloy, prevents the crystal size from becoming large even when crystals are formed, and improves magnetic properties such as magnetic permeability.

The Fe-based alloy debris may be produced by shattering an Fe-based alloy ribbon, wherein the Fe-based alloy ribbon thickness may be in the range of 15 to 35 μm, and the thickness of the ribbon may be increased by amorphizing the alloy It can be difficult. In addition, the Fe-based ribbon may have been subjected to a heat treatment process to improve magnetic properties such as permeability. The treatment temperature and the treatment time in the heat treatment process may vary depending on the specific composition ratio of the Fe-based alloy ribbon and the desired permeability The present invention is not particularly limited to this. On the other hand, as the brittleness of the heat-treated Fe-based ribbon becomes strong, the ribbon may be broken in the process of storing and transporting the ribbon. In order to prevent this, the thickness of the ribbon is preferably 25 to 30 μm.

The average particle size of the crushed Fe alloy fragments may be 0.5 to 700 mu m, preferably 0.5 to 650 mu m, and more preferably 0.5 to 600 mu m. The particle size of the fragment means the longest length of the line included in the outer surface of the fragment. A line included in the outer surface means a case where all points forming a line are present on the outer surface and a line in which some points forming a line exist outside the outer surface is excluded from the line included in the outer surface. At this time, preferably, the particle size distribution of the Fe-based alloy fragments may be 60% or more, more preferably 80% or more, of the number of fragments having a particle diameter of less than 500 占 퐉. If the number of fragments having a particle size of less than 500 탆 is less than 60% of the total number of fragments, the magnetic permeability of the Fe-based alloy itself is high, thereby inducing the improvement of the inductance characteristic of the radiator, It may be very insignificant, and heat generation due to eddy currents and magnetic leakage may occur due to magnetic leakage. Particularly, unexpected micro-fragmentation of the Fe-based alloy due to an additional external force, and consequently change of the designed physical properties or deterioration of physical properties may be caused.

Next, the dielectric 110b filled in at least a part of the spacing between adjacent ones of the above-mentioned Fe-based alloy fragments 110a will be described.

The dielectric 110b further minimizes the eddy current generated by partially or totally insulating the adjacent Fe-based alloy fragments and prevents the broken Fe-based alloy fragments 110a from moving within the first magnetic shielding layer 110 To prevent the Fe-based alloy fragments from being oxidized due to the permeation of moisture and to prevent the Fe-based alloy fragments (110a) from being further broken or microfragmented when an external force is applied to the magnetic shielding layer or bent, Can play a role.

1A, the dielectric 110b is partially separated from the spaced spaces S ₁ and S _{3 of the} spacing S between the first Fe alloy fragments 110a ₁ and the second Fe alloy fragments 110a ₂ , The dielectric 110b may be penetrated only into the remaining spacing S ₂ and may remain as an empty space in a state where no dielectric is present in the remaining spacing S ₂ . Alternatively, as shown in FIG. 1B, the dielectric 111b may be penetrated into the spacing space between adjacent pieces.

The material of the dielectric 110b or 111b may be a material known as a dielectric material and may be a material having adhesiveness in terms of fixing the Fe alloy fragments. In the case of a material exhibiting such properties, Can be used without limitation. As a non-limiting example, the dielectric materials 110b and 111b may be formed by curing the dielectric forming composition, forming the dielectric forming material after cooling it by heat, or developing the adhesive force at room temperature by pressing. As an example of a composition that is cured to form a dielectric, the dielectric forming composition includes at least one of a thermoplastic resin and a thermosetting resin, and may include a curing agent. The dielectric forming composition may further comprise a curing accelerator and a solvent.

Specifically, the thermoplastic resin may be at least one selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, acrylonitrile-butadiene-styrene resin (ABS), acrylonitrile-styrene resin (AN), acrylic resin, methacrylic resin, (PET), polybutylene terephthalate (PBT), phenoxy resin, polyurethane resin, nitrile butadiene resin, and the like.

The thermosetting resin may contain at least one of a phenol resin (PE), a urea resin (UF), a melamine resin (MF), an unsaturated polyester resin (UP) and an epoxy resin, May be an epoxy resin. Examples of the epoxy resin include bisphenol A, bisphenol F, bisphenol S, canceled bisphenol A, hydrogenated bisphenol A, bisphenol AF, biphenyl, naphthalene, fluorene, phenol novolac, Novolak type, trishydroxylphenylmethane type, tetraphenylmethane type and the like, or the like can be used alone or in combination.

When the thermosetting resin is mixed with a thermoplastic resin, the content of the thermosetting resin may be 5 to 95 parts by weight of the thermosetting resin relative to 100 parts by weight of the thermoplastic resin.

The curing agent can be used without any particular limitation as long as it is a known one. Non-limiting examples of the curing agent include an amine compound, a phenol resin, an acid anhydride, an imidazole compound, a polyamine compound, a hydrazide compound and a dicyandiamide compound Or a mixture of two or more thereof. The curing agent is preferably composed of at least one material selected from an aromatic amine compound curing agent and a phenol resin curing agent. The aromatic amine compound curing agent or the phenolic resin curing agent has an advantage of less change in adhesion property even when stored at room temperature for a long period of time. Examples of the aromatic amine compound curing agent include m-xylene diamine, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, diaminodearyl diphenylmethane, diaminodiphenyl ether, 1,3-bis (4 (4-aminophenoxy) phenyl] sulfone, 4,4'-bis (4-aminophenoxy) -Aminophenoxy) biphenyl, 1,4-bis (4-aminophenoxy) benzene, and the like, which may be used alone or in combination. Examples of the phenol resin curing agent include phenol novolac resins, cresol novolac resins, bisphenol A novolak resins, phenol aralkyl resins, poly-p-vinylphenol t-butylphenol novolak resins, and naphthol novolac resins. These may be used alone or in combination. The content of the curing agent is preferably 20 to 60 parts by weight per 100 parts by weight of the thermoplastic resin and / or the thermosetting resin. When the content of the curing agent is less than 10 parts by weight, the curing effect against the thermosetting resin is insufficient, On the other hand, if it exceeds 60 parts by weight, the reactivity with the thermosetting resin becomes high, and the physical properties such as handling property and long-term storage property of the magnetic shielding unit may be lowered.

Since the curing accelerator can be determined depending on the specific types of the thermosetting resin and the curing agent to be selected, the present invention is not particularly limited thereto, and examples thereof include amine, imidazole, phosphorus, boron, phosphorus - boron-based curing accelerators, which can be used alone or in combination. The content of the curing accelerator is preferably about 0.1 to 10 parts by weight, and more preferably 0.5 to 5 parts by weight per 100 parts by weight of at least one of the thermoplastic resin and the thermosetting resin.

The dielectrics 110b and 111b formed through the dielectric composition described above penetrate into a space in which at least one of the first adhesive layer 140b and the first adhesive member 130b described below is spaced apart from the Fe alloy fragments The composition of the adhesive layers (or adhesive members) of the dielectric layers 110b and 111b and the first adhesive layer 140b and the first adhesive member 130b may be equal to each other.

The thickness of the first magnetic shielding layer 110 may be the thickness of the ribbon sheet originating from the above-mentioned Fe-based alloy fragments. The thickness of the dielectric covering the upper or lower part of the debris, The thickness of the first magnetic-shielding layer 110 may be 15 to 50 탆, but is not limited thereto.

Also, the shape of the first magnetic-shielding layer may have a shape corresponding to the shape of the applied antenna. Specifically, the shape may be a polygon such as a pentagon, a circle, an ellipse, or a shape in which a curve and a straight line are mixed in addition to a rectangle and a square. For example, it may have the same shape (annular shape) corresponding to the shape of the antenna (Ex. Annular shape). At this time, the size of the first magnetic-shielding layer is preferably about 0.1 to 2 mm larger than the corresponding antenna size, but is not limited thereto.

3, the first sheet 103 included in one embodiment of the present invention includes a plurality of first magnetic shielding layers 113A and 113B, and the plurality of first magnetic shielding layers 113A, and 113B, a dielectric layer 150 may be interposed between the magnetic shield layers to reduce the eddy current. For example, the dielectric layer 150 may refer to a layer that functions as a dielectric.

In some cases, if only a single magnetic shielding layer is provided on the first sheet, it may not be suitable for functions such as wireless power transmission and magnetic security transmission. Accordingly, a plurality of the magnetic shielding layers 113A and 113B can be provided to increase the thickness and achieve the same effect of increasing the physical properties as using a magnetic material having a high magnetic permeability.

When a plurality of the magnetic shielding layers 113A and 113B are provided in the first sheet 103, it is preferable to have 2 to 12 magnetic shielding layers, and more preferably 3 to 6 magnetic shielding layers But is not limited thereto. On the other hand, if the number of laminated layers of the magnetic shielding layer is more than 12, the improvement of the quality factor of the antenna may be insignificant, Which may be undesirable for thinning the chip unit.

Meanwhile, the dielectric layer 150 may be a dielectric adhesive layer, and the dielectric adhesive layer may be formed through the dielectric forming composition described above. When a plurality of the magnetic shielding layers 113A and 113B are provided, a plurality of Fe-based alloy ribbons are stacked via the dielectric adhesive layer 150, and the ribbon is crushed to form a first sheet having a plurality of magnetic shielding layers In this case, the dielectrics 110b and 111b included in the lower portion of one of the adjacent one of the magnetic-field shielding layers 113A and the upper portion of the other of the two-magnetic-stripe shielding layers 113B may be formed of the two magnetic- And 113B may be formed by penetrating into the spacing space between the lower portion of the one magnetic-field shielding layer 113A and the Fe-based debris located in the upper portion of the typing current shielding layer 113B . Preferably, the adhesive strength of the dielectric adhesive layer 150 may be about 700 to 900 gf / inch. Further, it may be a double-sided tape having an adhesive layer on both sides of a supporting member (not shown) or may be constituted only by an adhesive layer without supporting members, but may not include supporting members on the side of thinning of the first sheet 103.

Further, in another embodiment, the dielectric layer 150 may be a heat-dissipation adhesive layer. The heat dissipation adhesive layer may be a mixture of a known heat dissipation filler such as nickel, silver, or carbon with an adhesive component such as acrylic, urethane, And the specific composition and content thereof are not particularly limited in the present invention, as they can follow the known compositions and contents.

When a plurality of the magnetic shielding layers 113A and 113B are provided, the compositions of the Fe-based alloys included in the respective magnetic shielding layers may be the same or different. Also, even though the composition is the same, the magnetic permeability of each of the magnetic shielding layers may be different due to the difference in heat treatment time and the like. The thickness of each of the magnetic shielding layers may be the same or different depending on the purpose.

Next, the second sheet 200 includes a second magnetic shielding layer 210, and the magnetic shielding layer 210 is formed of a plurality of fragments 210a of ferrite.

First, the second magnetic shielding layer 210 is formed of the fragments 210a of ferrite that are broken into the ferrite sheet to improve the flexibility of the second sheet 200. [

In order to make the magnetic shielding unit slimmer and thinner, the thickness of each sheet provided and the thickness of the magnetic body to be provided must be very thin at the same time. Ferrite suitable for an antenna having an operating frequency band of 13.56 MHz is very brittle, When the thickness is thin, cracks are generated even with a very weak external force, or the microstructures are broken, so that the permeability after cracking is significantly lower than that when the sheet is before cracking. In addition, since the second sheet, which is very thin, needs to be careful not to break after manufacturing, there is a problem that workability is significantly reduced in storage, transportation, In addition, even when a portable device is manufactured, the ferrite sheet is cracked or broken due to impact such as dropping during use, so that a desired level of transmission / reception efficiency or transmission / reception distance is secured There is a problem that can not be done.

However, since the ferrite 210a, which is a monolithic member included in the shielding unit according to an embodiment of the present invention, is crushed from the beginning and is provided in a fragmented state, the flexibility of the second sheet 200 is remarkably improved, Even if the cross-sectional thickness of the ferrite structure is made thinner, there is a fear that cracks may be further generated in the ferrite fragments due to external force. In addition, since the second sheet 200 including ferrite in a fragmented state includes ferrite in a fragmented state, the signal transmission and reception efficiency of the antenna having the operating frequency band of 13.56 MHz from the beginning and the transmission / Since the initial physical properties can be maintained at the stage of manufacturing the finished product to which the shielding unit 300 is mounted and further in the stage of using the finished product, the conventional non-fragmented It is possible to eliminate a fear of a decrease in physical properties due to unintentional fragmentation occurring in a shielding unit having a magnetic body having a magnetic body and a fear of a significant decrease in data transmission / reception performance.

The shape of the ferrite fragments 210a may be irregular. In addition, the average particle size of the single piece of the ferrite fragments 210a may be 100 to 2100 [mu] m. If the average particle diameter exceeds 2100 占 퐉, there is a problem that it is difficult to maintain the initial design property of the second sheet 200 due to an increase in breakage and fragmentation of additional fragments. If the average particle size of the debris is less than 100 탆, it is necessary to select the ferrite having a high magnetic property value such as the permeability of the ferrite before crushing. However, since the manufacturing of the ferrite having a high permeability is limited, It is difficult to design the initial physical properties. On the other hand, the average particle diameter of the fragments is a result measured based on the longest diagonal line of the diagonal length of each specimen distributed on the diagonal reference line within the area of 4 mm x 4 mm. On the other hand, even if the ferrite particles having a curved shape are not included, the magnetic particle shielding unit itself can not exhibit the desired effect because the particle size is less than 100 탆, but the particle size is excessively small .

On the other hand, ferrite forming the second magnetic shielding layer 210 provided on the second sheet 200 may be in the form of a composition, a crystal, or the like when it can exhibit magnetic properties such as magnetic permeability of a magnetic shielding unit There is no limitation on the kind and sintered grain microstructure, and known ferrites may be used. However, preferably, the crystal structure of ferrite may be spinel type. In addition, the ferrite may be a Ni-Zn-Cu ferrite, more preferably, a Ni-Zn-Cu ferrite may be formed of zinc oxide (ZnO) (Fe ₂ O ₃ ) 37 to 50 mol% and nickel oxide (NiO) 11 to 25 mol%, based on the total amount of the ferrite and the ferrite.

The Ni-Zn-Cu ferrite may be a Ni-Zn-Cu-Co ferrite further containing cobalt tetraoxide (Co ₃ O ₄ ), more preferably 0.2 to 0.35 mol% of cobalt tetraoxide, As shown in FIG. By further including cobalt tetroxide, it is possible to exhibit more suitable properties for local communication.

On the other hand, the composition and the composition ratio of the ferrite are not limited thereto and can be changed according to the desired properties.

The thickness of the second magnetic shielding layer 210 may be a thickness of the ferrite sheet or plate derived from the ferrite fragments. For example, the thickness of the second magnetic shielding layer 210 may range from 30 to 600 mu m. have. If the average thickness is less than 30 탆, it may not be possible to exhibit magnetic properties suitable for the operating frequency of 13.56 MHz at the desired level, and if it exceeds 600 탆, it is not preferable for making the shielding unit thinner.

The shape of the second magnetic-shielding layer 210 may be a polygonal or circular shape such as a pentagon, a circular shape, an elliptical shape or a partial shape such as a pentagon in addition to a rectangular shape and a square shape corresponding to the shape of the application site to which the magnetic- And may be a shape in which a curve and a straight line are mixed. At this time, the size of the second magnetic-shielding layer 210 is preferably about 0.1 to 2 mm larger than the antenna size of the corresponding module, but is not limited thereto.

Meanwhile, although the second sheet 200 included in the embodiment of the present invention has ferrite in the form of fragments from the beginning to form the second magnetic shielding layer, the real part (? ') Of the complex permeability at the frequency of 13.56 MHz, ) Satisfies 95 or more, preferably 125 or more, more preferably 140 or more, and even more preferably 180 or more. Although the flexibility of the second sheet 200 has been significantly improved through the fragmentation of ferrite through it, the physical properties required by the desired local communication can be fully satisfied, and even if there is an additional breakage of the ferrite fragments that may occur It is possible to satisfy the property values required by the intended short-distance communication in view of the deterioration of physical properties.

If the real part of the complex permeability at the above frequency is less than 95, the desired level of local communication efficiency can not be achieved. If one of the possible microfragmentation of the ferrite debris that can be generated does not satisfy the required level of property for local communication, There may be a problem of causing defects. In order to improve the local communication efficiency and communication distance, the second sheet 200 may have a quality index value of 20 or more, more preferably 45 or more, according to Equation 2 at a frequency of 13.56 MHz .

 &Quot; (2) "

The increase in the value of the quality index means that the real part of the complex permeability increases, the imaginary part does not change, or the real part of the complex permeability is constant, the imaginary part decreases or the real part increases and the imaginary parts decrease simultaneously In either case, improved local communication efficiency and communication distance can be increased. If the quality index is less than 20 at the frequency of 13.56 MHz, there is a problem that the improvement of the local communication efficiency is insignificant or the magnetic loss and heat generation due to the eddy current loss in the magnetic loss may increase.

On the other hand, the magnetic debris provided in the first sheet 100, 101, 102, 103, 104 and the second sheet 200, 201, 202, 203 may have mechanical characteristics such as brittleness And the magnetic permeability per frequency may be different from each other. Accordingly, the particle size distribution may vary depending on the type of the magnetic material to exhibit a certain level of flexibility, and the magnitude of the magnetic property degraded by the additional fine fragmentation may be different. The magnetic field shielding unit according to the present invention improves the characteristics of each antenna with different frequency bands as the operating frequency in consideration of the degree of change in magnetic characteristics expressed by mechanical strength and fragmentation degree of each magnetic material, In order to improve the flexibility of the shielding unit, the value of Equation 1 according to the present invention may be 3 to 35, preferably 3 to 25, and more preferably 3.3 to 23.1.

[Equation 1]

If the value of Equation (1) is less than 3, the magnetic characteristics of the second sheet are not very good, so that there is a problem that the short range communication efficiency and the transmission / reception distance can not be achieved at a desired level, It is difficult to maintain the magnetic characteristics designed in the first sheet and the magnetic loss due to the eddy current in the first sheet is remarkable and the wireless power transmission efficiency and the transmission / reception distance can not be achieved to the desired level have. If the value of Equation (1) exceeds 35, the flexibility of the second sheet is not very good and there is a problem that the additional micro-fragmentation and therefore the initial magnetic characteristic can not be maintained, It is not possible to achieve the desired level of wireless power transmission efficiency, transmission / reception distance, and the like.

Also, the range of Equation (1) according to the present invention for the enhancement of the wireless power transmission effect according to the composition can be different in the Fe-based alloy. Specifically, when the Fe-based alloy is a ternary sub-alloy including iron (Fe), silicon (Si), and boron (B), the value of Equation 1 according to the present invention may preferably be 3.3 to 15. In the case where the Fe-based alloy is a five-element-based alloy containing iron (Fe), silicon (Si), boron (B), copper (Cu) and niobium (Nb) May be in the range of 5 to 23.1. If the above range is satisfied, the wireless power transmission efficiency and / or the local communication efficiency can be further improved.

Meanwhile, the magnetic debris of the first sheet 100 and the second sheet 200, specifically, the debris of the Fe-based alloy and some of the debris of the ferrite have a straight line Non-curved shape. This is to further prevent the destruction, fragmentation and breakage of unintentional additional Fe-based alloys and / or ferrite fragments which may occur as the shielding unit is bent or bent. As a result, when the shielding unit is bent, debris having a curved shape at one side can reduce adjacent debris and collision or friction, thereby preventing further debris of the debris, thereby preventing property deterioration.

Preferably, the number of the fragments of the Fe-based alloy having a curved shape, at least one of which is not a straight line, is 15% or more, more preferably 15 to 90% of the total number of fragments of the Fe- %. ≪ / RTI > If the number of fragments having a curved shape of at least one side is less than 15% of the total number of fragments, improvement in flexibility may be insignificant, and an external impact may increase the fragments smaller than the fragments provided at the beginning, And the like.

In addition, the number of the pieces of the ferrite pieces having a curved shape, at least one of which is not a straight line, may be 25% or more, preferably 25 to 90% of the total number of ferrite pieces included in the magnetic shielding unit. If the number of fragments having a curved shape of at least one side is less than 25% of the total number of fragments, improvement in flexibility may be insignificant and an external impact may increase the fragments smaller than the fragments provided at the beginning, And the like.

On the other hand, in order to further prevent breakage and fragmentation of the fragments, the ferrite fragments 210a provided in the second sheet 200 preferably have fragments having a degree of deformation of 8.0 or less on one side of the fragments according to the following formula (3) .

&Quot; (3) "

The mathematical means the longest distance of the distances between any two points present on any one side of the circumscribed circle diameter is the fragments of debris from the formula 3 (in Fig. 5a R _1, in Fig. 5b R _2), and a fragment corresponding this time A circle passing through two points corresponds to a circumscribed circle of debris. In addition, the diameter of the inscribed circle of the fragment means the diameter of the inscribed circle having the largest diameter among the inscribed circles contacting at least two sides present on one side of the fragment (R ₁ in FIG. 5A and R ₂ in FIG. 5B). The large degree of deformation of one side of the debris means that the shape of one side of the debris is long (refer to FIG. 5A) or includes a sharp portion (see FIG. 5B), which means that further debris may be broken or fragmented do.

Accordingly, it is preferable that the number of fragments having a high degree of differentiation among the ferrite fragments included in the second sheet 200 is less than a predetermined ratio. Therefore, among the fragments in the second magnetic shielding layer 210, 10% or more of debris having a deformation degree of 8.0 or less on one side of the debris may be contained, more preferably, 15% or more, and more preferably, 20% or more of debris satisfying the deformation degree may be included. If the degree of deformation is less than 10%, the microstructures of the ferrite fragments may cause a significant deterioration of physical properties such as permeability and the desired initial property design values may not be maintained.

On the other hand, it is more preferable that the ferrite fragments satisfy the expression (3) as compared with the Fe-based alloy contained in the fragments because the degree of the magnetic property deterioration due to micro fragmentation of the ferrite fragments is greater than that of the Fe- Prevention of further microfragmentation of the ferrite shards of the second sheet 200 is very important in satisfying the initial design properties.

On the other hand, the above-mentioned diagrams can be used to manufacture fragments having a specific deformation degree by suitably adjusting the specifications of the metal balls and / or rollers of the apparatus for crushing the Fe-based alloy sheet and / or the ferrite sheet.

If the first magnetic shielding layer 110 is provided in the first sheet 100 as a single layer as shown in FIG. 1A, the first protective member 140 and the second protective member 140 are formed on the upper and lower portions of the first magnetic shielding layer 110, respectively. The first magnetic shielding layer 113B may include a first adhesive member 130b and a plurality of first magnetic shielding layers 113A and 113B as shown in FIG. (133b).

The second sheet 200 may be formed such that the second adhesive member 130b of the first sheet directly faces the upper portion of the second magnetic shielding layer 210 or the second magnetic shielding layer 212 And a second adhesive member 232b may be further provided on the lower portion.

The first protective member 140 may include a first adhesive layer 140b and a protective substrate 140a bonded to the first adhesive layer 140b and the second protective member 242 may include a second adhesive layer 140b, A second adhesive layer 242b and a protective substrate 242a bonded to the second adhesive layer 242b.

The protective substrates 140a and 242a may be a protective film provided in a conventional magnetic shielding unit and may be formed of a material capable of withstanding heat / pressure applied for curing in a process of attaching a shielding unit to a circuit board having an antenna And can be used without limitations as long as it is a material which can secure mechanical strength and chemical resistance enough to protect the magnetic shielding units 300 and 302 against external physical and chemical stimuli. As a non-limiting example, polypropylene, polyimide, crosslinked polypropylene, nylon, polyurethane resin, acetate, polybenzimidazole, polyimideamide, polyetherimide, polyphenylene sulfide (PPS). (PET), polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) and polychlorotrifluoroethylene PCTFE), and polyethylene tetrafluoroethylene (ETFE), which may be used alone or in combination. The protective substrate may have a thickness of 1 to 100 탆, preferably 10 to 30 탆, but is not limited thereto.

The first adhesive layer 140b and the second adhesive layer 242b serve to adhere the protective substrate 140a and the first magnetic shielding layer 110 and the second adhesive layer 242b to the protective substrate 242 and the second magnetic shielding layer, And may be formed of the above-described dielectric layer forming composition. The compatibility of the first magnetic shield layer 110 and the second magnetic shield layer 210 can be improved, And the adhesive strength can be improved. Also, the first adhesive layers 140b and 143b may be a double-sided tape having adhesive layers formed on both sides of a supporting member (not shown), or may be formed of an adhesive layer without supporting members. The adhesive strength of the first adhesive layers 140b and 143b and the second adhesive layer 242b may be 800 to 1500 g · f / inch, but is not limited thereto.

Any one of the first adhesive members 130b and 132b and the second adhesive members 230b and 232b may be used for bonding the first sheet 100 and the second sheet 200 to the second sheet 200 and 202, May be used for adhesion with the antenna unit in which the magnetic shielding unit is disposed. At this time, the bonding members 230 and 232 used for bonding with the antenna unit may further include a release substrate 230a for protecting the adhesive until they are bonded to the antenna unit.

As shown in FIGS. 1A and 2, when the first adhesive members 130b and 132b serve to bond the sheet to the sheet, the adhesive force may be about 100 to 600 g · f / inch, A double-sided tape having an adhesive layer formed thereon, or it may be constituted only by an adhesive layer without supporting members. At this time, the first adhesive members 130b and 132b may be a common adhesive component, preferably the same composition as the dielectric 110b provided in the first magnetic-shielding layer 110, It is possible to exhibit an excellent adhesive strength due to the above.

When the second adhesive members 230b and 232b are used to adhere the magnetic shielding units 300 and 302 to the adherend surface of the antenna unit or the like as shown in FIGS. 1A and 2, the adhesive force is about 800 to 1500 g · f / inch. Further, it may be a double-sided tape having an adhesive layer formed on both sides of a support member (not shown), or may be composed of only an adhesive layer without supporting members.

On the other hand, the first adhesive layer, the second adhesive layer, the first adhesive member, the second adhesive member, and the dielectric layer described above may exhibit adhesiveness or adhesiveness.

The magnetic field shielding units 300, 301, 302, 303 and 304 according to an embodiment of the present invention can be manufactured through a manufacturing method described below, but the present invention is not limited thereto.

First, a preferred method of the present invention according to the present invention is a method (method 1) of laminating a first sheet and a second sheet before crushing into a shape shown in Fig. 1 and then crushing the first sheet and the second sheet simultaneously (Method 2) in which the first sheet and the second sheet produced through the crushing process are formed into the shape shown in Fig.

The manufacturing method described below will be described on the basis of the method 2, and a person skilled in the art will not describe the method 1 since the method 1 can be easily carried out through the method 2 described later.

First, in the step (1) according to the method 2, the first sheet and the second sheet are respectively produced.

The first sheets 102 and 103 are formed on the upper and lower sides of the Fe-based alloy ribbon laminate in which one sheet of the Fe-based alloy ribbon sheet or a plurality of sheets is laminated as the step (a-1) , 143) and first adhesive members (132b, 133b) to produce a first sheet before crushing and (b-1) crushing the first sheet before shredding .

In the step (a-1), the Fe-based alloy ribbon sheet may be produced through an Fe-based amorphous ribbon sheet produced by a known method such as rapid coagulation (RSP) by melt spinning. The prepared Fe-based amorphous alloy ribbon may be subjected to a heat treatment process to adjust the permeability after cutting into a sheet. At this time, the heat treatment temperature may be selected depending on the degree of permeability of the desired amorphous alloy. In order to increase the brittleness of the ribbon sheet, it is preferable that the heat treatment temperature is 300-600 Lt; 0 > C for 30 minutes to 2 hours.

The Fe-based alloy ribbon sheet can be laminated on one sheet or according to the purpose. When a plurality of ribbon sheets are laminated, the above-described dielectric layer forming composition is applied between the respective ribbon sheets through a usual method, (150) can be formed. The first protective members 142 and 143 and the first adhesive members 132b and 133b are formed on the upper and lower portions of the ribbon sheet or the plurality of ribbon stacked bodies, respectively. The first adhesive layers 142b and 143b and the first adhesive members 132b and 133b provided on the first protective members 142 and 143 may be formed by applying a conventional adhesive or the dielectric forming composition described above. At this time, a release substrate for protecting the first adhesive members 132b and 133b may be further provided under the first adhesive members 132b and 133b. The mold release substrate is not particularly limited in the present invention as it is possible to use materials known in the art. The first protective members 142 and 143 prevent scattering and separation of the Fe-based alloy in the crushing step of step (b) described later, and protect the magnetic shielding unit to be manufactured.

Next, in the step (b-1), a step of crushing the produced first sheet before crushing may be performed. In one embodiment of the step (b-1), the first sheet before crushing is passed through a crushing device as shown in FIGS. 6B and 6C to remove the Fe-based alloy sheet or plate provided on the first sheet before crushing, . Further, the pressure applied in the crushing step and / or the pressure applied to the first sheet 100 separately, the adhesive layer formed on both sides of the ribbon sheet or the ribbon laminate is permeated into the spacing space of the fragmented Fe-based alloy to form a dielectric It protects and supports the debris by inserting the debris, minimizes the magnetic loss by the eddy current, buffering the debris, preventing damage, crushing and microfragmentation of additional debris by external force, It is possible to prevent the magnetic body from being oxidized. On the other hand, a pressurizing process can be further performed several times to further increase the penetration of the adhesive layer into the spacing space between the crushed Fe-based alloys.

Specifically, as shown in Figs. 6 (b) and 6 (c), a plurality of insertion grooves 22 into which a plurality of balls 30 are rotatably inserted are provided in a crushing apparatus including a plurality of forming tables 20, The first sheet 100 can be manufactured by inserting one sheet and crushing the sheet through the balls 30. Thus, in the flake treating apparatus according to the present embodiment, since the balls 30 are arranged in a plurality of rows, the Fe alloy ribbon sheet is first crushed while passing through the first row of balls 30a, and the second row balls 30b And is thirdly crushed while being passed through the third row ball 30c and crushed fourthly while passing through the fourth row ball 30d so that the flake treatment of the Fe alloy ribbon sheet in one process It is possible to reduce the working time and improve the productivity.

The pressing unit 40 includes a pressing roller 42 disposed on the top surface of the ball 30 in the same number as the rows of the balls 30 and pressing the Fe alloy ribbon sheet and a pressing roller 42 rotatably supported at both ends of the pressing roller 42 A hinge bracket (not shown) supported on the first partition (not shown) and the second partition (not shown) so as to be linearly movable in the up-and-down direction, and a driving motor And a power transmission unit (not shown) for transmitting the rotational force of a driving motor (not shown) to the plurality of pressure rollers 42. [

The shape of the ball 30 may be spherical, but is not limited thereto. The shape of the ball 30 may be a triangle, a polygon, an ellipse, or the like, and the ball may have one shape or a mixture of various shapes.

Next, the second sheet 200 is formed by forming second protective members 242 and 243 and second adhesive members 232b and 233b on the upper and lower surfaces of the ferrite sheet or the plate, respectively, in step (a-2) And (b-2) a step of crushing the second sheet 200a before crushing.

In the step (a-2), the ferrite sheet or the plate can be manufactured by a known method, so there is no particular limitation thereto. As an example, a method for producing a Ni-Zn-Cu-Co ferrite is described. A raw material mixture is obtained by mixing nickel oxide, zinc oxide, copper oxide, cobalt oxide and iron trioxide so as to have a predetermined composition ratio. At this time, the mixture can be mixed by dry mixing or wet mixing, and the particle diameter of the raw material to be mixed is preferably 0.05 to 5 mu m. The components such as nickel oxide and zinc oxide contained in the raw material mixture may be in the form of a composite oxide containing the above components themselves or in the form of cobalt ferrite and cobalt tetraoxide in the case of cobalt oxide. The raw material mixture can be obtained as a plastic material through plasticization. The calcination is carried out in order to promote the thermal decomposition of the raw material, the homogenization of the components, the generation of ferrite, the disappearance of ultrafine powder by sintering, and the grain growth to an appropriate particle size so as to convert the raw material mixture into a form suitable for post processing. The calcination is preferably carried out at a temperature of 800 to 1100 DEG C for about 1 to 3 hours. The preliminary firing may be performed in an air atmosphere or an atmosphere having a higher oxygen partial pressure than the atmosphere. Next, the calcination material obtained is pulverized to obtain a pulverized material. The pulverization is carried out in order to collapse the aggregation of the firing material to obtain a powder having an appropriate degree of sintering property. When the firing material forms a large lump, it may be pulverized by a wet milling method using a ball mill, an attritor or the like. The wet pulverization can be carried out until the average particle diameter of the pulverized material is preferably about 0.5 to 2 mu m. Thereafter, the ferrite plate or sheet can be produced through the obtained pulverizing material. A known method can be used for producing the ferrite sheet, and thus the ferrite sheet is not particularly limited in the present invention. As a non-limiting example, the obtained pulverizing material is slurried together with additives such as a solvent, a binder, a dispersant, and a plasticizer to prepare a paste. Using this paste, a ferrite sheet having a thickness of 30 to 350 mu m can be formed. After the sheet is processed into a predetermined shape, a binder removal process and a firing process are performed to produce a ferrite sheet. The firing may be performed at a temperature of 900 to 1300 DEG C for about 2 to 5 hours. The atmosphere may be an atmospheric environment or an atmosphere having a higher oxygen partial pressure than the atmosphere. On the other hand, as an example of producing the ferrite plate, the ferrite powder and the binder resin may be mixed and then manufactured by a known method such as a powder compression molding method, an injection molding method, a calendar method, or an extrusion method.

A second adhesive layer 242b and 243b and a release substrate or protective substrates 242a and 243a for protecting the second adhesive layers 242b and 243b are laminated on the ferrite sheet or plate prepared as described above, (242, 243). Further, the second bonding members 232b and 233b can be formed below the prepared ferrite sheet or plate, and a release substrate for protecting the second bonding members 232b and 233b can be further provided. The second protective sheet 242 or 243 and the second adhesive sheet 232b or 233b may be manufactured by the same method as the sheet forming method (a-1) described above, The first protective member and the first adhesive member are the same as those of the first protective member and the first adhesive member, and a detailed description thereof will be omitted.

Next, as the step (b-2), a step of crushing the produced second sheet before crushing can be performed. In one embodiment of the step (b-2), the second sheet 200a before crushing is passed through a crushing device as shown in FIG. 6A to cut the ferrite sheet provided in the second sheet 200a before crushing into ferrite pieces You can. On the other hand, the condition of the crushing process may be changed in order to increase the number of the ferrite fragments having a curved shape or to control the grain size of the ferrite fragments.

Specifically, the shredding apparatus shown in FIG. 6A includes an inlet 81 of a shredding apparatus having a first roller 70 and a second roller 60 corresponding to the first roller 70, The second sheet 200 that is discharged through the discharging unit 80 by crushing and pressing the second sheet 200a before it is crushed can be manufactured through passing through the discharging unit 200a. The first roller 70 may be a silicon roller, and the second roller 60 may be a metal roller, but not limited thereto, and any roller that can be used for crushing a ferrite sheet can be used without limitation. Meanwhile, the diameter of the second roller 60 may be adjusted or the pressure applied may be adjusted to increase the number of the fragments having the curved shape or to control the particle size of the fragments.

The step of laminating the manufactured first sheet 102, 103 and the second sheet 202, 203 is then carried out as a preferred step (2) of producing a magnetic shielding unit, The release member may be further attached to the upper surface of the other sheet layer after removing the releasing member which may be further included in the adhesive member provided in the layer, and a predetermined pressure may be further applied in the adhesive process.

7A, the magnetic-field shielding unit 304 according to an embodiment of the present invention manufactured through the above-described method includes a short-range communication antenna 520 and a radio-power transmission antenna 540, The magnetic shielding unit 304 enhances the antenna characteristics and focuses the magnetic flux toward the antenna unit. The magnetic flux shielding unit 304 is disposed on one surface of the unit 500 to implement a multifunction composite module.

The antenna unit 500 may include a short range communication antenna 520 formed on the outer side of the substrate 510 and a wireless power transmission antenna 540 disposed on the inner side of the short range communication antenna 520. The antenna for short-range communication 520 or the antenna for wireless power transmission 540 may be an antenna coil wound so that the coil has a constant inner diameter or may be an antenna pattern printed with an antenna pattern on a substrate, Structure, size, material, etc. are not particularly limited in the present invention.

7A, the first sheet 104 provided in the magnetic-field-shielding unit 304 may be used for the purpose of remarkably expressing the intended short- The second sheet 204 and the second sheet 204 may be arranged so that the sheet exhibiting excellent magnetic properties at the operating frequency used by each antenna corresponds to the antenna, And may be formed to be narrower than the second sheet 204 so as to correspond to the antenna 540 for power transmission.

Specifically, the sheet that exhibits excellent magnetic characteristics at the operating frequency used by the antenna is, for example, the first sheet 104 is relatively inferior to the second sheet 204 in the frequency band of 10 to 400 kHz, which is a low frequency band Has a high permeability and / or has a relatively larger saturation magnetic field than the second sheet 204 in the frequency band of 10 to 400 kHz. Since the first sheet 100 has a relatively higher magnetic permeability than the second sheet 204 in the frequency band of 10-400 kHz, an AC magnetic field generated according to a power signal of 10-400 kHz frequency transmitted during wireless charging It is possible to induce the wireless power signal to be received with high efficiency by the antenna for wireless power transmission arranged on the first sheet 104 side by being guided toward the first sheet 104 having a relatively high permeability.

Also, the second sheet 204 has a high permeability real part and a high imaginary part in the frequency band of 13.56 MHz. Therefore, when short range wireless communication (NFC) is performed, It is possible to induce the high frequency signal to be received with high efficiency to the NFC antenna side disposed on the second sheet 204 side by being guided to the side of the second sheet 204 having a high value of the part / imaginary part.

8, the antenna unit 500 may further include an antenna 530 for transmission of magnetic security. When the operation frequency of the antenna 530 for magnetic security transmission is 10 to 400 kHz The antenna 530 for magnetic security transmission may be combined to correspond to the first sheet 104 exhibiting excellent magnetic characteristics in the frequency band.

Also, the multifunction composite module according to an embodiment of the present invention may be provided in a portable device as a receiving module, and wireless power transmission efficiency, data reception efficiency, charge distance or data reception distance can be remarkably improved.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

(1) Production of first sheet

1) Fabrication of first magnetic shielding layer

A quench solidification method (RSP) by the melt spinning Fe _{73. 5} Si _{13 . 5} B ₉ Cu ₁ Nb ₃ amorphous alloy ribbon A ribbon sheet having a thickness of 24 μm cut into a sheet shape after its manufacture was subjected to a heat treatment for 5 hours at 560 ° C. in an N ₂ atmosphere for 1 hour to prepare a ribbon sheet. A PET protective member (International Latex, KJ-0714) having a thickness of 7 탆 and a pressure-sensitive adhesive layer formed on one side thereof was attached to one side of the ribbon sheet, and then the same breaking apparatus as shown in Figs. 6B and 6C was passed three times 1 magnetic shielding layer. The metal balls were in the shape of a sphere having a diameter of 3 mm and a crushing device having a distance between metal balls of 0.5 mm was used.

2) Production of first sheet

As shown in FIG. 3, the first magnetic shielding layer was laminated in a two-layer structure, and a base type double-sided tape having a thickness of 10 m was interposed between the first magnetic shielding layer and the first magnetic window shielding layer, The magnetic sheet shielding layers were laminated to prepare a first sheet. Thereafter, the first sheet was cut into 45 mm x 48 mm

(2) Production of second sheet

100 parts by weight of a ferrite powder having an average particle diameter of 0.75 탆 (48.75 mol% Fe ₂ O ₃ , 14.79 mol% NiO, 24.99 mol% ZnO, 11.22 mol% CuO and 0.25 mol% Co ₃ O ₄ ) And 50 parts by weight of a solvent in which toluene and ethanol were mixed in a ratio of 5: 5 were mixed, dissolved and dispersed in a ball mill. Thereafter, the ferrite mixture was formed into a sheet shape by a conventional tape casting method, followed by degreasing at 500 for 10 hours and calcining and cooling at 940 for 2.2 hours to prepare a ferrite sheet having a final thickness of 80 탆.

Thereafter, a double-sided tape (support base PET, KYWON CORP., VT-8210C) having a thickness of 10 mu m and having a release film adhered on one surface of the ferrite sheet was attached. PET protective (International Latex, KJ-0714) was attached, and then passed through a crushing apparatus as shown in Fig. 6A to prepare a second sheet. A silicone roller having a diameter of 100 mm was used as the first roller, and a carbon steel S45C roller having a diameter of 36 mm was used as the second roller. Thereafter, the second sheet was cut into 75 mm 80 mm.

(3) Magnetic shielding unit manufacturing

As shown in FIG. 7A, the magnetic sheet shielding unit 304 was manufactured by stacking the first sheet 104 on the upper surface of the second sheet 204 with a base type double-faced tape having a thickness of 10 mu m interposed therebetween.

≪ Examples 2 to 7 and Comparative Examples 1 to 5 >

The magnetic shielding unit was manufactured in the same manner as in Example 1 except that the crushing conditions were changed as shown in Table 1 below.

≪ Example 8 >

In the first magnetic shield layer production step, Fe _{91 . 6} Si ₂ B ₆ Co _{0 . 2} Ni _{0 .2} amorphous alloy was used as the magnetic shielding sheet.

≪ Example 9 >

Except that ferrite powder (48.5 mol% Fe ₂ O ₃ , 4.1 mol% NiO, 28.8 mol% ZnO, 10.3 mol% CuO and 8.2 mol% MgO) having an average particle diameter of 0.75 μm was used in the second sheet production step. 1 to prepare a magnetic shielding sheet.

<Experimental Example>

The following properties of the magnetic field shielding unit according to Examples and Comparative Examples were evaluated and shown in Table 1 below.

1. Measurement of particle size distribution of debris

After separating the first sheet and the second sheet of each of the magnetic shielding units manufactured according to the examples and the comparative example, the adhesive protective film provided on one surface of the first sheet and the second sheet was peeled off, The average grain size of the Fe-based alloy fragments and the ferrite fragments were measured, and the number of fragments smaller than 500 占 퐉 and the total number of fragments were counted. Then, fragments smaller than 500 占 퐉 in size were measured The average fractions of 5 samples were calculated.

2. Wireless power signal transmission efficiency and data signal transmission distance evaluation

7A, a short-range communication antenna 520 and a wireless power transmission antenna 540 are implemented by using a copper foil having a thickness of 50 mu m on both sides of the FPCB 510. As shown in Fig. Specifically, the short-range communication antenna 520 is formed by turning four turns of a copper foil having a thickness of 50 탆 to be 53 mm x 63 mm inside and 59 mm x 65 mm outside, and VSWR (Voltage Standing Wave Ratio) 1.5, and the resonance frequency was 13.56 MHz. 7A, the copper foil having a thickness of 50 탆 was turned by 11 turns to have an inner diameter of 23 mm and an outer diameter of 43 mm. At 200 kHz, the inductance Ls ) Was 8.8 μH, and the resistance (Rs) was 0.589Ω.

Shielding unit in such a manner that a lower region of the first sheet of the magnetic shielding unit corresponds to an upper region of the antenna for wireless power transmission so that the second sheet of the magnetic shielding unit corresponds to the manufactured antenna unit's short- Units were arranged to produce a multifunctional composite module. The following properties were evaluated for each of the multifunctional composite modules manufactured.

2-1. Wireless power signal transmission efficiency

A 200 kHz sinusoidal signal is amplified and input to the wireless power transmission antenna provided in the wireless power signal transmission module, and a composite module having a load resistance of 50? Connected to the output terminal of the wireless power reception antenna is aligned and transmitted through a wireless power reception antenna The generated current was measured through an oscilloscope to measure the power transmission efficiency. At this time, the power transmission efficiency of the embodiment and the comparative example was relatively evaluated based on the power transmission efficiency of the comparative example 1 as 100%.

2-2. Data signal transmission distance

An NFC reader / writer was connected to the short-range communication antenna of the composite module through a cable. In addition, an NFC IC card to which the same antenna as the antenna for short-range communication provided in the composite module and the NFC IC chip are connected is manufactured. At this time, the power transmission efficiency of the embodiment and the comparative example was relatively evaluated based on the power transmission efficiency of the comparative example 1 as 100%.

division Example
One Example
2 Example
3 Example
4 Example
5 Example
6 Example
7 Number of ferrite sheet shreds One 3 2 One One One One Fe-based alloy ribbon shreds 3 3 3 4 5 6 7 Average particle diameter of ferrite shatter (占 퐉) 1810 582 847 1810 1810 1810 1810 Fe-based alloy debris average particle diameter (占 퐉) 138 138 138 96 73 66 53 Equation 1 13.1 4.2 6.1 18.9 24.8 27.6 34.2 Fe-based alloy fragments Particle fraction less than 500 탆 (%) 92 92 99 100 100 100 100 Wireless Power Transmission Efficiency (%) 147 133 137 140 138 131 130 Data signal transmission distance (%) 93 82 87 88 84 82 80

division Example
8 Example
9 Comparative Example
One Comparative Example
2 Comparative Example
3 Comparative Example
4 Comparative Example
5 Number of ferrite sheet shreds One One - 4 One One 8 Fe-based alloy ribbon shreds 3 3 - 3 8 One 3 Average particle diameter of ferrite shatter (占 퐉) 1810 1566 - 349 1810 1810 68 Average particle diameter (占 퐉) of Fe- 286 138 - 138 48 771 138 Equation 1 6.32 11.3 - 2.5 37.5 2.35 0.49 Fe-based debris Particle fraction less than 500 탆 (%) 73 92 - 92 100 56 92 Wireless Power Transmission Efficiency (%) 140 143 100 129 123 109 122 Data signal transmission distance (%) 90 91 100 68 75 81 63 1) Comparative Example 1 shows a multifunctional composite module comprising an unfragmented Fe-based alloy sheet and a ferrite sheet.

As can be seen from Tables 1 and 2, Examples 1 to 9 satisfying the values 3 to 35 of the formula 1 with respect to the average particle size of the fragments of the Fe-based alloy according to the present invention and the average particle size of the fragments of the ferrite The wireless power transmission efficiency and data signal transmission distance are superior to those of Comparative Examples 1 to 5, which do not satisfy this requirement.

As can be seen from Example 1, Comparative Examples 4 and 5, when either the average particle size range of the ferrite fragments or the average particle size range of the Fe-based particles can not be satisfied, not only the effect corresponding to each fragment, The effect corresponding to the debris is reduced. Specifically, since Comparative Example 4 does not satisfy the average particle diameter of Fe-based fragments, the wireless power transmission efficiency is reduced as additional fragmentation occurs, and at the same time, the data signal transmission distance is also reduced as compared with the first embodiment. In the comparative example 5, the data signal transmission distance is reduced as the average grain size of the ferrite fragments is excessively small, and at the same time, the wireless power transmission efficiency is also reduced as compared with the first embodiment. Thus, it can be seen that the wireless power transmission efficiency and the data signal transmission distance can be simultaneously improved due to the synergistic effect when the grain sizes of the respective fragments are all satisfied.

In Comparative Example 4 in which the number of fragments having a particle size of less than 500 占 퐉 of the fragment of the Fe-based alloy was less than 60% as compared with Example 1 in which the number of fragments having a particle diameter of less than 500 占 퐉 was 60% or more, the number of fragments The wireless power transmission efficiency was not good, and at the same time, the data signal transmission distance also decreased. As a result, it can be confirmed that the wireless power transmission efficiency and the data signal transmission distance can be improved at the same time by satisfying the number of the fragments having the grain size of the Fe-based alloy of less than 500 탆 at 60% or more.

On the other hand, the multifunctional composite module according to the ninth embodiment including the ferro-alloy fragments of the ternary system and the ferrite debris including the magnesium oxide (MgO) according to the ninth embodiment of the present invention, The magnetic field shielding unit and / or the multifunctional composite module according to the present invention can be used for the Fe-based alloy and / or the ferrite of the first to seventh embodiments, It can be confirmed that it is possible to exhibit excellent effects without limitation.

On the other hand, the multifunctional composite module manufactured according to the comparative example has no synergistic effect with each other because it includes the Fe-based alloy and the ferrite on the sheet, and accordingly, it is confirmed that the power transmission efficiency and the data signal transmission distance are relatively poor .

&Lt; Example 10 >

A second roller having a diameter of 56 mm was used for the production of the second sheet, and an iron-based alloy ribbon was crushed once in the production of the first sheet.

3. Flexibility evaluation

In order to evaluate the flexibility of the magnetic shielding sheet manufactured according to Examples 1, 3, 4, 10, and 10, the experiment was carried out under the same conditions as those of the experimental method, The antenna unit and the magnetic shielding sheet were separated and bent 100 times so that both side ends of the separated magnetic shielding sheets contacted. After the pin, the antenna unit was disposed on the magnetic shielding sheet to measure the power transmission efficiency and the maximum communication distance. The power transmission efficiency and the maximum communication distance after bending based on the power transmission efficiency before bending and the maximum communication distance as 100% are respectively evaluated relatively and shown in Table 3 below.

division Example 1 Example 3 Example 4 Example 10 Comparative Example 1 Comparative Example 4 Average particle diameter of ferrite shatter (占 퐉) 1810 847 1810 2706 - 1810 Fe-based alloy debris average particle diameter (占 퐉) 138 138 96 771 - 771 Equation 1 13.1 6.1 18.9 3.5 - 2.35 Wireless power transmission efficiency Before bending 100 100 100 100 100 100 After bending 93 92 92 51 35 59 Data signal transmission distance Before bending 100 100 100 100 100 100 After bending 92 89 91 62 33 84

As can be seen from Table 3, Example 1, Example 3 and Example 4 including the fragments having the curved shape of the present invention exhibit excellent power transmission efficiency and data signal transmission distance even after bending the multifunction composite module. .

Example 10 satisfies the range of formula (1) according to the present invention. However, since the average particle diameter of the ferrite fragments and the average particle diameter range of the Fe-based alloy fragments are not satisfied, the wireless power transmission efficiency after bending and the data signal transmission distance Is remarkably lowered.

In addition, the multifunctional composite module manufactured according to Comparative Example 1 shows that the power transmission efficiency and data signal transmission distance are drastically reduced as excessive fragmentation occurs at the bending stage.

Further, in Comparative Example 4, as the average particle diameter of the Fe-based alloy fragments does not satisfy the range according to the present invention, it can be seen that the wireless power transmission efficiency after bending is significantly lowered and the data signal transmission distance is also lowered.

Accordingly, when fragments having a curved shape are not included, additional fragments of each Fe-based alloy and / or ferrite fragments are generated in the course of bending the multifunctional composite module, so that the power transmission efficiency and / It can be seen that the signal transmission distance decreases. Even if the fragment including the curved shape is included, it can be seen that the power transmission efficiency and / or the data signal transmission distance decreases when the average particle diameter of the fragments is excessive.

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 exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100, 101, 102, 103, 104: first sheet 200, 201, 202, 203, 204:
300, 301, 302, 303, 304: magnetic field shielding unit 500: antenna unit
510: circuit board 520: antenna for short range communication
530: Antenna for magnetic security transmission 540: Antenna for wireless power transmission

Claims (19)

A first sheet having a first magnetic shielding layer formed of fragments of an Fe-based alloy crushed to improve the flexibility of the shielding unit and to reduce the generation of eddy currents, thereby improving the antenna characteristics of the wireless power transmission; And
And a second sheet having a second magnetic shielding layer formed of fragments of ferrite that are broken to improve the flexibility of the shielding unit,
Wherein a value of the following equation (1) with respect to an average particle diameter of the fragments of the Fe-based alloy and an average particle diameter of the fragments of the ferrite is 3 to 35.
[Equation 1]

The method according to claim 1,
Wherein the first magnetic shield layer comprises a dielectric material that is permeable to at least a portion of a spaced space formed between adjacent ones of the debris of the Fe-based alloy. The method according to claim 1,
Wherein the first sheet includes a plurality of first magnetic shield layers,
Wherein the first sheet comprises a plurality of first magnetic shielding layers stacked, and a dielectric layer interposed between the plurality of first magnetic shielding layers stacked. The method according to claim 1,
Wherein the Fe-based alloy debris has an average particle diameter of 0.5 to 700 占 퐉. The method according to claim 1,
Wherein the fragments of the Fe-based alloy satisfy 60% or more of the number of fragments having a particle size of less than 500 占 퐉. The method according to claim 1,
Wherein the first magnetic shield layer has a thickness of 15 to 50 占 퐉. The method of claim 3,
Wherein the first sheet comprises 2 to 12 first magnetic shield layers. The method according to claim 1,
Wherein the second sheet has a quality index value of 20 or more at a frequency of 13.56 MHz according to Equation (2).
&Quot; (2) &quot;

The method according to claim 1,
And the second magnetic shield layer has a thickness of 30 to 600 mu m. The method according to claim 1,
Wherein the average particle size of the single piece of ferrite fragments is 100 to 2100 탆. The method according to claim 1,
Wherein a value according to Equation (1) satisfies 3 to 25. The method according to claim 1,
And wherein the shape of the debris for at least one of the Fe-based alloy fragments and the ferrite fragments is irregular. The method according to claim 1,
Wherein at least one of the fragments of the Fe-based alloy has a curved shape, which is not a straight line, is 15% or more of the total number of fragments of the Fe-based alloy included in the magnetic shielding unit. The method according to claim 1,
Wherein at least one of the ferrite fragments has a curved shape other than a straight line, the number of the fragments being 25% or more of the total number of ferrite fragments included in the magnetic shielding unit. The sheet according to claim 1, wherein the first sheet and the second sheet
Shielding layer provided on each sheet, and a bonding member disposed under the lowermost magnetic-field shielding layer, and a protective member disposed on the uppermost magnetic shielding layer of the magnetic shielding layer provided on each sheet. An antenna unit including an antenna for short-range communication and an antenna for wireless power transmission; And
The multifunction composite module according to any one of claims 1 to 15, wherein the magnetic shielding unit is disposed on one surface of the antenna unit to improve the antenna characteristics and focus the magnetic flux toward the antenna unit. 17. The method of claim 16,
Wherein the antenna for wireless power transmission is formed inside the antenna for short range communication,
Wherein the first sheet of the magnetic shielding unit is arranged to correspond to the antenna for wireless power transmission. 17. The method of claim 16,
Wherein the antenna unit further comprises a magnetic security transmit (MST) antenna,
Wherein the first sheet of the magnetic shielding unit is disposed on one side of the antenna unit so as to correspond to the antenna for the magnetic security transmission. 17. A portable device comprising the multifunction composite module according to claim 16 as a receiving module.

Images