KR101939653B1 - 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 an Fe-based alloy crushed in order to improve flexibility of the shielding unit and to reduce eddy currents, A first sheet for improving the sheet; And a second magnetic shielding layer formed of fragments of the ferrite that are crushed to improve the flexibility of the shielding unit to improve antenna characteristics for short range communication and to accommodate a portion of the first sheet or a total thickness thereof And a second sheet containing the first sheet, wherein the second sheet is configured to satisfy a specific expression for the average grain size of the fragments of the Fe-based alloy and the average grain size of the ferrite fragments. According to the present invention, it is possible to improve the transmission / reception distance and transmission / reception efficiency of a signal by improving the characteristics of different kinds of antennas having different frequency bands at different operating frequencies, and at the same time, It is possible to prevent the decrease of the magnetic permeability in the operating frequency band of the antenna and to prevent the deterioration of the durability due to the peeling of the shielding unit. In addition, it is possible to prevent the influence of a magnetic field on a component such as a portable terminal device or a human body using the same, and improve the characteristics of the antenna for short range communication, thereby remarkably improving data transmission / reception efficiency.

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 magnetic shielding structure for a wireless communication device, comprising a first magnetic shielding layer formed of fragments of an Fe-based alloy crushed to reduce flexibility and the generation of eddy currents in a shielding unit, 1 sheet; And a second magnetic shielding layer formed of fragments of ferrite that are broken to improve the flexibility of the shielding unit to improve antenna characteristics for short range communication and to accommodate a portion of the first sheet or a total thickness thereof Wherein a value of the following formula 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. The magnetic sheet shielding unit according to claim 1,

[Equation 1]

According to an embodiment of the present invention, the receiving portion may be a receiving recess recessed from a surface of the second sheet to a predetermined depth, or a through hole penetrating the second sheet.

In addition, the first magnetic shielding layer may include a dielectric material that is at least part of a spacing space formed between adjacent ones of the fragments of the Fe-based alloy.

In addition, the first sheet may include a plurality of first magnetic shield layers, and a dielectric layer may be interposed between the adjacent first magnetic shield layers to adhere the magnetic shield layers.

The fragments of the Fe-based alloy may have an average particle diameter of 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.

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.

According to another aspect of the present invention, there is provided an antenna unit including a short-range communication antenna and a wireless charging antenna. And the above-described magnetic field shielding unit disposed on one surface of the antenna unit to improve the antenna characteristic and focus the magnetic flux toward the antenna unit.

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

In addition, the antenna unit may further include a magnetic security transmission (MST) antenna, and the first sheet of the magnetic shielding unit may be provided to correspond to the magnetic security transmission antenna.

The present invention also provides a portable device including the multifunction composite module 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 change of the magnetic permeability in the operating frequency band of the antenna in advance and to improve the adhesion to the adherend having the step difference and to prevent the deterioration of durability due to peeling of the shielding unit.

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.

1 is a cross-sectional view of a magnetic shielding unit according to an embodiment of the present invention. FIG. 1A is a cross-sectional view showing a magnetic shielding unit having a first sheet in a receiving portion of a second sheet formed with through- 1C is a cross-sectional view showing a magnetic shielding unit having a first sheet in a receiving portion of a second sheet formed of a receiving recess recessed by the thickness of the sheet. FIG. 1C is a cross- Sectional view showing a magnetic shielding unit having a first sheet in a receiving portion of two sheets,
FIG. 2 is a cross-sectional view of a magnetic field shielding unit according to an embodiment of the present invention. FIG. 3 is a view showing that a dielectric is filled in all of the spacing spaces of the fragments of the Fe-based alloy. FIG. 4 is a view showing the shape of a fragment observed on one surface of a magnetic shielding layer in a magnetic shielding unit according to an embodiment of the present invention. FIG. 4 is a view showing a first sheet having three first magnetic shielding layers, 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 400 according to an embodiment of the present invention includes a first sheet 100 and a second sheet 200 having a receiving portion formed with a through hole for receiving the first sheet, . Protective members 310 and 320 may be disposed on upper and lower portions of the first and second sheets 100 and 200, respectively.

1B and 1C, the second sheet 202 is formed with a receiving groove recessed to a predetermined depth in order to receive the first sheet, The shielding unit 402 may be formed to have a thickness of one sheet 102 so that a step is not formed on the first sheet 102 and the second sheet 202 or the second sheet 203 are formed so as to be shallower than the thickness of the first sheet 103 so that the shielding unit 403 is formed so that a step is formed on the first sheet 103 and the second sheet 203 It is possible.

The first sheet 100 may improve the characteristics of an antenna having a frequency band of 10 to 400 kHz as an operating frequency, and more preferably, may be a wireless charging antenna. Further, the antenna may be an antenna for performing a heterogeneous function having the frequency band as an operating frequency, 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 111 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 fragmented fragments 110a 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 are further generated 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 of the alloy, prevents the size of the crystal 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 magnetic material included in the conventional magnetic shielding member is advantageous for shielding the magnetic field as the permeability increases. However, since the relationship between the permeability of the magnetic body and the antenna characteristics can not be regarded as a simple proportional relationship, It may not be possible to improve an antenna (Ex. Wireless charging) characteristic having a frequency band including an operating frequency of 400 kHz. Specifically, when a single adult having a high permeability in a frequency band including 10 to 400 kHz is combined with a wireless recharging antenna, the inductance characteristic of the antenna is improved, and the increase in the specific resistance property of the antenna is further increased than the improvement in the inductance characteristic . In this case, the degree of improvement of the antenna characteristic is rather small, so that the antenna characteristic can not be improved to the desired level. Therefore, it is preferable that the magnetic-field shielding layer is provided with an Fe-based alloy having an appropriate permeability and loss permeability so as to improve the inductance of the antenna when the magnetic-field shielding unit is combined with a specific antenna and minimize an increase in specific resistance .

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 the fragments having a particle size of less than 500 μm is less than 60% of the total number of fragments, the magnetic permeability of the Fe-based alloy itself is high and the improvement of the inductance characteristic of the radiator is further enhanced. It may be insignificant, and heat generation due to an eddy current and a magnetic shielding ability may be deteriorated due to magnetic leakage. Particularly, unintentional microfragmentation of the Fe-based alloy due to an additional external force and consequently alteration of the originally designed physical properties or deterioration of the physical properties may be caused.

Next, the dielectric 110b penetrating 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, while at the same time fixing the fractured Fe-based alloy fragments 110a so as not to move within the magnetic shielding layer 110 And can prevent the Fe-based alloy fragments from being oxidized due to the permeation of moisture and to prevent the fragments 110a from being further broken or microfragmented when an external force is applied or bent to the magnetic shielding layer have.

Said dielectric (110b) comprises a 1 Fe-based alloy fragments (111a ₁₎ and claim 2 Fe-based alloy fragments (111a ₂₎ portion spaced from between spaced space (S) as shown in Figure 1a (S _1, S ₃ 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. 2, 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 are formed by penetrating a space in which at least one of the first adhesive layer 140b and the second adhesive layer 130b described later is spaced apart from the Fe- The composition of the dielectric layer and the adhesive layer of at least one of the first adhesive layer 140b and the second adhesive layer 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.

The first sheet 104 included in the magnetic shielding unit according to an embodiment of the present invention includes a plurality of magnetic shielding layers 114A, 114B, and 114C including a first magnetic shielding layer as shown in FIG. 3, And between the adjacent magnetic shield layers 114A / 114B and 114B / 114C among the plurality of magnetic shield layers 114A, 114B, and 114C, there are interposed between the magnetic shield layers, And may further include dielectric layers 150a and 150b.

In some cases, when only a single magnetic shielding layer is provided on the first sheet, it may not be suitable for functions such as wireless charging and magnetic security transmission. Accordingly, a plurality of the magnetic shielding layers 114A, 114B, and 114C 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 114A, 114B and 114C are provided in the first sheet 104, it is preferable that the magnetic shielding layer has 2 to 12 magnetic shielding layers, and 3 to 6 magnetic shielding layers are provided. 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 layers 150a and 150b may be dielectric adhesive layers, and the dielectric adhesive layer may be formed through the dielectric forming composition described above. When a plurality of the magnetic shielding layers 114A, 114B, and 114C are provided, a plurality of Fe-based alloy ribbons are laminated via the dielectric adhesive layer 150, and the ribbon is crushed to form a first The sheet 104 can be manufactured. In this case, the dielectric included in the lower portion of one of the adjacent one of the magnetic-field shielding layers 114A and the upper portion of the other of the other's shielding layers 113B is a dielectric adhesive layer 150a interposed between the two magnetic-field shielding layers 114A and 114B And may be formed by penetrating into the spacing space between the lower portion of the one-magnetic-field shielding layer 114A and the Fe-based debris located in the upper portion of the batter-base shielding layer 114B. Preferably, the dielectric adhesive layers 150a and 150b may have a thickness of 1 to 10 μm and an adhesive force of about 700 to 900 g · f / 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 104.

In another embodiment, the dielectric layers 150a and 150b may be a heat dissipation adhesive layer. The heat dissipation adhesive layer may be formed by mixing 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 may be in accordance with a known composition and content, so that the present invention is not particularly limited thereto.

When a plurality of the magnetic shielding layers 114A, 114B, and 114C 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 ferrite pieces 210a that are formed by crushing a 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 debris of the ferrite fragments may be 100 to 2100 탆. 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.

The Ni-Zn-Cu ferrite may be a Ni-Zn-Cu-Mg ferrite further comprising magnesium oxide (MgO), and more preferably 3 to 12 mol% of the magnesium oxide . By further including magnesium oxide, there may be an advantage that physical properties more suitable for magnetic security transmission can be exhibited.

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 and the like in the first sheet is remarkable so that the wireless charging efficiency and the transmission / reception distance can not be attained to the desired level . 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 may not achieve the wireless charging efficiency, the transmission / reception distance, etc. to the desired level.

Also, in the Fe-based amorphous alloy, the range of the formula (1) according to the present invention for the expression of a further improved wireless charging effect may be different depending on the composition. Specifically, when the Fe-based amorphous alloy is a ternary alloy containing iron (Fe), silicon (Si) and boron (B), the value of the formula 1 according to the present invention may preferably be 3.3 to 15 . In the case where the Fe-based amorphous alloy is a five-element-based alloy containing iron (Fe), silicon (Si), boron (B), copper (Cu) and niobium (Nb) The value of 1 may be between 5 and 23.1. When the above range is satisfied, the wireless charging efficiency and / or the local communication efficiency can be further improved.

On the other hand, the magnetic debris of the first sheets 100, 101, 102, 103 and 104 and the second sheets 200, 201, 202 and 203, specifically the fragments of the Fe- Some of the fragments have a curved shape, at least one of which is not a straight line, as shown in Fig. 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 in which at least one side is not a straight line may be 15 to 90% of the total number of the fragments of the Fe-based alloy in the magnetic shielding unit. 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. If the number of fragments of the Fe-based alloy having at least one curved shape exceeds 90% of the total number of fragments, the number of fragments having a curved shape increases and flexibility can be improved. However, The desired effect may not be achieved.

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 to 90% of the total number of the ferrite pieces included in the magnetic-field 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. In addition, if the number of ferrite pieces having at least one curved shape exceeds 90% of the total number of pieces, the number of pieces having a curved shape increases and flexibility can be improved. However, Therefore, the desired effect may not be achieved.

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 a long distance with one distance between any two points present on any one side of the fragment is the circumscribed circle diameter of the 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 above-described formula (3) in comparison with the Fe-based alloy contained in the debris because the degree of the magnetic property deterioration due to micro fragmentation of the ferrite fragments is more severe 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 debris having a specific deformation degree by appropriately adjusting the specifications of the metal balls and / or irregularities of the apparatus for crushing the Fe-based alloy sheet and / or the ferrite sheet.

The first sheet 104 may include a first adhesive layer 140b and a second adhesive layer 130b on the upper and lower portions of the first magnetic shielding layer 110, When the first magnetic shielding layers 114A, 114B and 114C are provided as shown in FIG. 3, the upper part of the uppermost magnetic shielding layer 114A and the lower part of the lowermost magnetic shielding layer 114C The first adhesive layer 144b and the second adhesive layer 134b may be further included. The second sheet 204 may further include a first adhesive layer 240b and a second adhesive layer 230b on upper and lower portions of the second magnetic shielding layer 210, respectively.

The first adhesive layers 140b, 144b and 240b and the second adhesive layers 130b and 134b and 230b are provided on the upper and lower portions of the first and second sheets 100 and 104 and the protective sheets 310 and 320 The first sheet 100, 104 and the second sheet 200 can be adhered to each other. In addition, it is possible to prevent the fragmented Fe-based alloy and the fragmented ferrite from being separated and scattered while preventing the external moisture from penetrating, thereby preventing the alloy or ferrite from being oxidized.

Meanwhile, the first adhesive layers 140b, 144b, and 240b and the second adhesive layers 130b, 134b, and 230b may be formed of the dielectric material 110b, which is penetrated into the spacing space between the Fe- . That is, after the first adhesive layers 140b, 144b, 240b and the second adhesive layers 130b, 134b, 230b are formed on both surfaces of the sheet-like or plate-like Fe-based amorphous alloy and ferrite, The first adhesive layers 140b, 144b, and 240b and the second adhesive layers 130b, 134b, and 230b can penetrate into the spaced spaces of the fragmented Fe-based alloy fragments, The dielectric 110b can be formed in the spaced apart spaces of the magnetic body fragments without providing the dielectric 110b.

The first adhesive layers 140b, 144b, and 240b and the second adhesive layers 130b, 134b, and 230b may be used without limitation in the case of a common adhesive layer, but may be formed of the dielectric layer forming composition described above, The compatibility of the first magnetic-shielding layer 110 and the second magnetic-shielding layer 210 is increased, so that more improved adhesion can be exhibited. The thicknesses of the first adhesive layers 140b, 144b, and 240b and the second adhesive layers 130b, 134b, and 230b may independently be 1 to 50 탆, but are not limited thereto. The first adhesive layers 140b, 144b and 240b and the second adhesive layers 130b, 134b and 230b may be a double-sided tape having adhesive layers formed on both sides of a supporting member (not shown) have. The adhesive strength of the first adhesive layers 140b, 144b and 240b and the second adhesive layers 130b, 134b and 230b may be 800 to 1500 g · f / inch, but is not limited thereto.

The protective members 310 and 320 may be a protective film provided in a conventional magnetic shielding unit, and may have a structure capable of withstanding the heat / pressure applied for curing in the process of attaching the shielding unit to the circuit board having the antenna And can be used without limitations as long as it is a material that can provide mechanical strength and chemical resistance sufficient to protect the magnetic shielding unit 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 magnetic field shielding units 400, 401, 402, and 403 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 for manufacturing a Japanese tablet according to the present invention is a method (method 1) of producing a first sheet and a second sheet before crushing in the shape of FIG. 1 and simultaneously crushing a first sheet and a second sheet, (Method 2) in which the first sheet and the second sheet produced through the above-described method are manufactured 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 100 and 104 are formed by stacking a first adhesive layer 140b and a second adhesive layer 140b on upper and lower portions of an Fe amorphous ribbon laminate in which one sheet of an Fe amorphous ribbon sheet or a plurality of sheets is laminated, 144b and the second adhesive layers 130b, 134b to produce a first sheet before crushing and (b-1) crushing the first sheet before shredding.

In the step (a-1), the Fe-based amorphous ribbon sheet may be produced by a known method such as rapid coagulation (RSP) by melt spinning. The prepared Fe-based amorphous alloy ribbon can be cut into sheets and subjected to a heat treatment process to control the permeability. The annealing temperature may be selected depending on the degree of the magnetic permeability of the desired amorphous alloy. In order to increase the brittleness of the amorphous ribbon, the amorphous alloy may exhibit excellent physical properties over various operating frequency ranges. Lt; 0 > C for 30 minutes to 2 hours.

A plurality of Fe-based amorphous ribbon sheets can be laminated according to the purpose. In the case of laminating a plurality of ribbon sheets, the above-described dielectric layer forming composition is applied between the respective ribbon sheets by a usual method, followed by drying Thereby forming the dielectric layers 150a and 150b. The first adhesive layer and the second adhesive layer are formed on upper and lower portions of a ribbon sheet or a plurality of ribbon stacked bodies, respectively, wherein the first adhesive layer and the second adhesive layer are formed by applying a conventional adhesive or the above- Followed by drying. At this time, a protective substrate or a release substrate may be further provided on the first adhesive layer, and a release substrate may further be provided on the bottom of the second adhesive layer. The protective substrate or the release substrate is not particularly limited in the present invention as it is possible to use substrates known in the art. The protective base material or the release base material serves to protect the first adhesive layer and the second adhesive layer while preventing the amorphous alloy from scattering or escaping in the crushing step of step (b) to be described later. When the protective substrate is provided on the first adhesive layer, the protective substrate may be continuously provided between the upper protective member 320 and the first adhesive layer 140b of the magnetic shielding unit to be finally manufactured, 320 and the protective substrate may be further provided with an adhesive layer. Or a magnetic shielding unit in which the upper protective member 320 is omitted when the protective substrate is provided in the final magnetic shielding unit.

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. As described above, in the flake processing apparatus according to the present embodiment, since the balls 30 are arranged in a plurality of rows, the amorphous ribbons are first crushed while passing through the first row balls 30a and passed through 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 amorphous ribbon is completed in one step, And the productivity can be improved.

The pressure unit 40 includes a pressure 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 amorphous ribbon, A hinge bracket (not shown) arranged linearly in a vertical direction on the first bank (not shown) and the second bank (not shown), a drive motor (not shown) fixed to the base frame And a power transmitting portion (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 a first adhesive layer 240b and a second adhesive layer 230b on the upper and lower portions of the ferrite sheet or the plate, respectively, in the 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 pulverized material obtained 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.

The first adhesive layer 240b and the second adhesive layer 230b are formed on the upper and lower surfaces of the prepared ferrite sheet or plate. The first adhesive layer 240b and the second adhesive layer 230b are the same as those in the step (a-1) of the first sheet manufacturing method described above, 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 ferrite fragments having a curved shape.

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 a curved shape.

Then, with the preferred step (2) of manufacturing the magnetic shielding unit, the step of forming the receiving part in the manufactured second sheet 200 can be performed. When the receiving portion is a through-type, the through-type receiving portion can be formed by tapping the inside of the second sheet 200 with a desired size. Alternatively, when the receiving portion is the receiving groove, the second sheet 201 or 202 may be recessed to a predetermined depth to form the receiving groove. As a method for depressing a certain portion of the second sheet, an ordinary method can be used, so that the present invention is not particularly limited thereto.

Next, as a preferred step (3) of manufacturing the magnetic shielding unit, the first sheet 100, 101, 102 is cut in the second sheet 200, 201, The first sheet 100, 101, 102 may be provided on the first sheet 100, and the magnetic shielding unit may be manufactured. The first sheet 100 and the second sheet 200 may be fixed and supported by attaching the second adhesive layers 130b and 230b of the first sheet 100 and the second sheet 200 to the lower protective member 320, . Or the first sheets 101 and 102 are formed on the bottom of the receiving grooves of the second sheets 201 and 202 through the second adhesive layer 130b provided on the first sheets 101 and 102, And the lower protective member 320 can be further disposed on the lower surface of the second adhesive layer provided on the second sheets 201 and 202. Alternatively, the second adhesive layer provided on the second sheets 201 and 202 may be used as an adhesive layer for bonding to the antenna unit without forming the lower protective member 320. [ The upper protective member 310 may further be disposed on the first adhesive layers 140b and 240b of the first sheets 100, 101 and 102 and the second sheets 200, 201 and 202.

7A, the magnetic-field-shielding unit 400 according to an embodiment of the present invention manufactured through the above-described method comprises an antenna unit 520 including a short-distance communication antenna 520 and a wireless- And the magnetic field shielding unit 400 enhances the antenna characteristics and focuses the magnetic flux toward the antenna unit.

The antenna unit 500 may include a short range communication antenna 520 formed on the outer side of the substrate 510 and a wireless charging 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 charging 540 may be an antenna coil wound around the coil to have a predetermined inner diameter or may be an antenna pattern printed with an antenna pattern on a substrate, , Size, material, etc. are not particularly limited in the present invention.

7A, the first sheet 100 and the second sheet 100, which are included in the magnetic-field-shielding unit 400, are provided for the purpose of remarkably expressing the intended short-range communication and the wireless charging function. The second sheet 200 can be arranged so that the sheet exhibiting excellent magnetic characteristics at the operating frequency used by each antenna corresponds to the corresponding antenna, And may be accommodated in the second seat 200 with a width and a width so as to correspond to the antenna 540 for use.

More specifically, the first sheet 100, which exhibits excellent magnetic characteristics at an operating frequency used by the antenna, is relatively inferior to the second sheet 200 in a frequency band of 10 to 400 kHz which is a low frequency band Have a high magnetic permeability and / or have a relatively large saturation magnetic field in the frequency band of 10 to 400 kHz than the second sheet 200. Since the first sheet 100 has a relatively higher magnetic permeability than the second sheet 200 in the frequency band of 10 to 400 kHz, an AC magnetic field generated according to a power signal of 10 to 400 kHz frequency transmitted during wireless charging It is possible to induce the wireless power signal to be received with high efficiency by the wireless charging antenna disposed on the first sheet 100 side by being guided toward the first sheet 100 having a relatively high permeability.

In addition, the second sheet 200 has a high permeability real part and an imaginary part in the frequency band of 13.56 MHz. Therefore, when short range wireless communication (NFC) is performed, Since the quality factor of the antenna is increased through the second sheet 200 having a high value of the part / imaginary part, it is possible to induce the high frequency signal to be received with high efficiency to the NFC antenna disposed on the second sheet 200 side .

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 magnetic security transmission antenna 530 can be combined to correspond to the first sheet 100 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 charging efficiency, data receiving efficiency, charging distance or data receiving 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 of the ribbon sheet was attached to the surface of the ribbon sheet, and then subjected to a crushing device as shown in Fig. 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

The first magnetic-shielding layer was laminated in a three-layer structure as shown in Fig. 3 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 made into a sheet shape by a conventional tape casting method, followed by degreasing at 500 ° C for 10 hours, followed by firing and cooling at 940 ° C for 2.2 hours to prepare a ferrite sheet having a final thickness of 80 μm .

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 to 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 x 80 mm, and a 45 mm x 48 mm through-type receiving portion was formed by punching the inside of the second sheet to form the through-type receiving portion in the cut second sheet.

 (3) Magnetic shielding unit manufacturing

The magnetic sheet shielding unit was manufactured by providing the first sheet cut in the receiving portion of the second sheet formed with the through-type receiving portion.

≪ 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 embodiment, the adhesive protective film provided on one surface of the first sheet and the second sheet was peeled off, The average particle size of the Fe-based alloy fragments and the ferrite fragments were measured to count the number of fragments smaller than 500 占 퐉 and the total number of fragments, and then measure the fragments smaller than 500 占 퐉 in size relative to the total number of fragments. The average fragment fraction was 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.

A magnetic shielding unit is disposed on one surface of the antenna unit so that the first sheet of the magnetic shielding unit corresponds to the antenna for wireless power transmission so that the second sheet of the magnetic shielding unit corresponds to the short- 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 was relatively evaluated based on the power transmission efficiency of the comparative example 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. After outputting a data signal of 13.56 MHz through the NFC reader / writer, the NFC card was positioned in the vertical direction of the antenna for the short-range communication of the composite module, and the maximum communication distance was measured. At this time, the maximum communicable distance of the embodiments was relatively evaluated based on the maximum communicable distance of the comparative example 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 Average particle diameter (占 퐉) of Fe- 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 debris Particle fraction less than 500 탆 (%) 92 92 99 100 100 100 100 Wireless Power Transmission Efficiency (%) 146 132 137 139 136 129 127 Data signal transmission distance (%) 92 83 87 88 83 81 79

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 (%) 139 142 100 128 122 109 121 Data signal transmission distance (%) 91 90 100 71 76 80 66 1) The above comparative example 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 is less than 60% as compared with Example 1 in which the number of fragments having a particle diameter of less than 500 占 퐉 is 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 .

3. Flexibility evaluation

In order to evaluate the flexibility of the magnetic shielding sheet manufactured according to the examples and the comparative example, the experiment was carried out under the same conditions as the above-mentioned experimental method, except that the antenna unit and the magnetic shielding sheet were separated, The antenna unit was placed 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 Comparative Example 1 Power transmission efficiency Before bending 100 100 100 100 After bending 95 98 95 37 Data signal transmission distance Before bending 100 100 100 100 After bending 96 97 94 33

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. .

It can be seen that the power transmission efficiency and the data signal transmission distance of the multifunctional composite module manufactured according to Comparative Example 1 are drastically reduced due to the occurrence of excessive fragmentation at the bending stage.

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.

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:
310, 320:
400, 401, 402, 403: magnetic field shielding unit
500: antenna unit 510: circuit board
520: Antenna for short-range communication 530: Antenna for magnetic security transmission
540: Wireless charging antenna

Claims (18)

A first magnetic shielding layer formed of fragments of a crushed Fe-based alloy having a number of fragments having a particle diameter of less than 500 탆 of 60% or more of the total number of fragments, in order to improve the flexibility of the shielding unit and reduce the generation of eddy current, A first sheet for improving the antenna characteristics for the antenna; And
And a second magnetic shielding layer formed of fragments of ferrite that are broken to improve the flexibility of the shielding unit so as to improve the characteristics of the antenna for short range communication and to accommodate a portion of the first sheet or a total thickness thereof And a second sheet,
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 receiving portion is a through hole penetrating through the second sheet or a receiving recess recessed from a surface of the second sheet to a predetermined depth. 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,
And a dielectric layer for bonding the magnetic shielding layers between the adjacent first magnetic shielding layers. The method according to claim 1,
Wherein the fragments of the Fe-based alloy have an average particle diameter of 0.5 to 700 占 퐉. delete The method according to claim 1,
Wherein the first magnetic shield layer has a thickness of 15 to 50 占 퐉. 5. The method of claim 4,
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,
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. An antenna unit including a short-range communication antenna and a wireless charging antenna; And
The magnetic shielding unit according to any one of claims 1 to 5, 7 to 14, arranged on one surface of the antenna unit to improve the antenna characteristic and focus the magnetic flux toward the antenna unit Includes multifunctional composite modules. 16. The method of claim 15,
Wherein the wireless charging antenna is formed inside the antenna for short-range communication,
And the first sheet of the magnetic shielding unit corresponds to the wireless charging antenna. 16. The method of claim 15,
Wherein the antenna unit further comprises a magnetic security transmit (MST) antenna,
And the first sheet of the magnetic shielding unit corresponds to the antenna for magnetic security transmission. 17. A portable device comprising the multifunction composite module according to claim 15 as a receiving module.

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