KR102175375B1 - Attractor for a wireless charging receiver module and a wireless charging receiver module having the same - Google Patents

Abstract

An attractor for a wireless power receiving module is provided. An attractor for a wireless power receiving module according to an exemplary embodiment of the present invention includes: a thin magnetic piece made of at least one layer of magnetic material; And an anti-oxidation member provided in the thin magnetic piece to prevent fine pieces from being removed from the punching surface of the thin plate magnetic piece or from being oxidized to the punching surface of the thin plate magnetic piece. The preventing member is a protective film, and the protective film includes a first region covering an upper surface of the thin magnetic piece and a second region extending from the first region and covering a side surface of the magnetic thin plate. According to this, it is possible to prevent oxidation and short circuit due to particles through the prevention of detachment of fine pieces and the oxidation preventing member, and stable operating voltage values can be obtained even if the attractor is formed with a thickness of 300 μm or less. It is possible to implement a power receiving module.

Description

The attractor for a wireless power receiving module, and a wireless power receiving module having the same {Attractor for a wireless charging receiver module and a wireless charging receiver module having the same}

The present invention relates to an attractor for a wireless power receiving module and a wireless power receiving module having the same.

Recently, various functions such as radio frequency identification (RFID), short-range wireless communication (NFC), wireless charging, and interactive pen tablets have been added to portable terminals including mobile phones and tablet PCs.

NFC is a non-contact short-range wireless communication module using a 13.56MHz frequency band as one of RFID, an electronic tag, and refers to a technology that transmits data between terminals at a close distance of 10cm. NFC is not only a mobile payment method, but also a file transmission method. It is widely used in supermarkets or general stores to transmit product information or travel information for visitors, traffic, and access control locks.

In addition, the'Android Beam' installed in a smartphone recently announced by Google is a short-range wireless communication (NFC)-based short-range information transmission/reception function, and not only mobile payments, but also photos, business cards, files, maps, and websites are available on one phone. It provides a function to transfer to another phone.

On the other hand, the portable terminal is equipped with a wireless charging function for wirelessly charging the built-in battery. Such wireless charging includes a wireless power receiving module built in the portable terminal and a wireless power transmission supplying power to the wireless power receiving module. Made by modules.

In addition, wireless charging may be classified into a magnetic induction method and a magnetic resonance method, and may be classified into a PMA method and a Qi method according to a method of detecting the approach of the wireless power receiving module to the wireless power transmission module.

The PMA wireless charging method controls the operation of the wireless power transmission module by detecting the proximity of the wireless power receiving module using a permanent magnet and a hall sensor, and the concept thereof is schematically illustrated in FIG. 1.

As shown in Fig. 1, the wireless power transmission module 10 has a permanent magnet 14 and a hall sensor 12 installed, and the wireless power reception module 20 has a so-called attractor 22 at its approximately center. Magnetic body is installed.

When the wireless power receiving module 20 approaches the wireless power transmission module 10, magnetic lines of force are generated from the permanent magnet 14, and some of these lines of magnetic force are changed by the attractor 22 and the Hall sensor ( 12) occurs, and when the change in voltage value exceeds a certain level, it is recognized that the wireless power receiving module 20 has approached, and the wireless power transmitting module 10 operates so that wireless charging is performed. do.

Such an attractor is usually manufactured by a punching process, and the side of the attractor manufactured by the punching process constitutes a punching surface. At this time, when the attractor is made of a magnetic material containing a metal component, the following problems occur when the punching surface is used in a product with the punching surface exposed to the outside.

That is, when particles such as fine particles or powdery particles are separated from the punching surface exposed to the outside, the particles separated from the punching surface also contain a conductive metal component, so the separated particles are located around the electronic circuit. When in contact with, a problem occurs in that the electronic circuit is shorted by a metal component.

In addition, during the salt spray test to test the reliability of the attractor, contact with moisture or the like occurs on the exposed surface, which is the punching surface. Accordingly, when moisture or the like penetrates into the punching surface through contact with moisture or the like, there is a problem that the exposed surface is oxidized.

KR 10-1188808 B

The present invention was devised in consideration of the above points, and a wireless power receiving module attractor capable of preventing separation of fine pieces from the punching surface of the attractor exposed to the outside and preventing oxidation, and a wireless having the same Its purpose is to provide a power receiving module.

In order to achieve the above object, the present invention is an attractor of a wireless power receiving module, comprising: a thin magnetic piece made of at least one layer of magnetic material; And an attractor for a wireless power receiving module including a micro-splinter prevention and oxidation prevention member provided in the thin magnetic piece and preventing fine pieces from being removed from the punching surface of the thin magnetic piece or oxidizing the punching surface. to provide.

In addition, the attractor is provided in the wireless power receiving module, and when the wireless power receiving module approaches the wireless power transmitting module, it induces a part of the magnetic line of force generated in the wireless power transmitting module to change the path of the magnetic flux to change the path of the wireless power. It is possible to induce a voltage value change that satisfies the operation start condition of the transmission module.

In addition, the punching surface may be a side surface of the thin magnetic piece.

In addition, the microscopic piece detachment prevention and oxidation prevention member may be directly attached to the thin magnetic piece through an adhesive layer. In this case, the adhesive layer may include a non-conductive component.

In addition, the attractor can be applied to the PMA wireless charging method.

According to a preferred embodiment of the present invention, the thin magnetic piece may be any one of silicon steel, amorphous ribbon, ferrite, permalloy, and polymer, and an amorphous ribbon layer may be stacked in a plurality of layers.

In addition, the micro-segment detachment prevention and oxidation prevention member may be a protective film.

In addition, the micro-segment detachment preventing and oxidation preventing member may include a first region covering an upper surface of the thin magnetic piece and a second region extending from the first region to cover a side surface of the magnetic thin plate.

In addition, the second region may be provided to have a width of 1 to 3 times the thickness of the thin magnetic piece.

In addition, the thin magnetic piece may be an Fe-based or Co-based amorphous alloy.

In addition, the amorphous ribbon layer may be formed separately into a plurality of fine pieces.

In addition, the plurality of fine pieces may be entirely insulated or partially insulated between adjacent fine pieces.

In addition, the plurality of fine pieces may have a size of 1 μm to 3 mm.

In addition, the plurality of fine pieces may be formed in an irregular shape.

In addition, the magnetic thin plate may have a magnetic permeability of 100 to 1000.

In addition, the microscopic debris detachment prevention and oxidation prevention member may be provided with a fluororesin-based film containing at least one selected from polyethylene terephthalate (PET), polypropylene (PP), and polyterephthalate (PTFE).

In addition, the thin magnetic piece may be configured by laminating a ribbon sheet of a thin plate made of an amorphous alloy or a nano-crystal grain alloy in at least three layers or more.

In addition, the thin magnetic piece may be configured by stacking a ribbon sheet of a thin plate made of an amorphous alloy or a nano-crystalline alloy in 5 or 7 layers.

In addition, the thin magnetic piece may be formed to have the same size as the size of the central space portion of the inner antenna pattern provided in the wireless power receiving module.

In addition, the thin magnetic piece may have a thickness of 100 to 300 µm, preferably 150 to 220 µm.

In addition, the attractor of the present invention is applied to a wireless power receiving module having a thickness of 0.15mm to 0.6mm, even 0.3mm, so that a stable change in voltage value can be induced in the Hall sensor.

On the other hand, the present invention is an antenna unit having at least one antenna pattern; A magnetic field shielding sheet for shielding a magnetic field generated by a radio frequency signal of the antenna unit; And an attractor as described above positioned between the antenna unit and the magnetic field shielding sheet.

In addition, the total thickness of the wireless power receiving module may be 0.15 ~ 0.6mm.

In addition, the total thickness of the wireless power receiving module may be 0.3mm.

In addition, the magnetic field shielding sheet may be formed of a thin ribbon sheet made of at least three layers of an amorphous alloy or a nanocrystalline alloy.

In addition, the magnetic field shielding sheet may be formed of a thin ribbon sheet made of at least two layers of an amorphous alloy or a nano crystal grain alloy and at least one layer of a ferrite sheet.

In addition, the antenna unit may be a combo type including at least two antennas of a wireless charging antenna, an MST antenna, and an NFC antenna.

In addition, the attractor may be integrated with the antenna unit or the magnetic field shielding sheet.

According to the attractor of the present invention, by providing a member for preventing separation of fine pieces and preventing oxidation on the punching surface of the attractor exposed to the outside, oxidation through contact with air and/or moisture is prevented, and particles are separated from the side. By being able to prevent it, short circuit of the internal circuit due to particles can be prevented.

In addition, according to the wireless power receiving module of the present invention, the attractor that changes the path of the magnetic flux by inducing a part of the magnetic field line generated from the permanent magnet when approaching the wireless power transmission module is 300㎛ or less, for example, 150㎛ very All the conditions required by the PMA wireless charging method without any other structural changes even under the condition that the overall thickness of the wireless power receiving module is designed to be 0.6mm or less, even 0.3mm or less, by being provided with a thin sheet of magnetic piece. And since it is possible to implement a wireless power receiving module that satisfies the characteristics, it is possible to apply a stable and efficient application to a portable terminal that is light, thin, short and small.

1 is a view for explaining the concept of access detection of a wireless power receiving module to a wireless power transmission module in a general PMA wireless charging system charging system;
2 is a perspective view schematically showing a shielding unit according to an embodiment of the present invention, and a PMA wireless charging method wireless power receiving module having the same;
Figure 3 is a cross-sectional view of Figure 2,
4 is a cross-sectional view showing a detailed configuration of an attractor in a wireless power receiving module according to an embodiment of the present invention, showing a case in which the micro-splinter prevention and oxidation prevention members are provided on the upper and side surfaces of the magnetic piece;
5 is a cross-sectional view showing a detailed configuration of an attractor in the wireless power receiving module according to an embodiment of the present invention, showing a case in which the micro-splinter prevention and oxidation prevention members are provided only on the side of the magnetic piece;
6A and 6B are photographs showing the side of the attractor, FIG. 6A is a photograph showing the conventional attractor, and FIG. 6B is a photograph showing the side of the attractor according to the present invention;
7A and 7B are enlarged cross-sectional views schematically showing the shielding sheet stacked structure of the shielding unit according to an embodiment of the present invention. A diagram showing a case made of a ribbon sheet and a ferrite sheet of an alloy or nanocrystalline alloy,
8A to 8C are views showing various forms of an attractor receiving unit in the wireless power receiving module according to an embodiment of the present invention.
9A to 9C are views showing another form of an attractor accommodating unit and an attractor in the wireless power receiving module according to an embodiment of the present invention;
10 is a view showing an arrangement relationship between a first part and a second part in an attractor according to an embodiment of the present invention;
11 is a schematic diagram corresponding to FIG. 1 for explaining the concept of access detection of a wireless power receiving module to a wireless power transmitting module in a PMA wireless charging method charging system employing a wireless power receiving module according to an embodiment of the present invention;
12 is a flow chart showing a method of manufacturing an attractor in the wireless power receiving module according to an embodiment of the present invention.
13 is a flow chart showing another method of manufacturing an attractor in the wireless power receiving module according to an embodiment of the present invention, a flow chart showing a process of punching out a plate-shaped stack with a plurality of magnetic pieces;
14 is a flow chart showing another method of manufacturing an attractor in the wireless power receiving module according to an embodiment of the present invention, a flow chart showing a process of punching out a plate-shaped film member into a plurality of protective films;
FIG. 15 is a flow chart showing another method of manufacturing an attractor in the wireless power receiving module according to an embodiment of the present invention, and a final attractor by combining a magnetic piece and a protective film separately separated through FIGS. 13 and 14 A flow chart showing the process of manufacturing, and,
16 is a perspective view showing a state in which a PMA wireless charging method wireless power receiving module is embedded in a portable terminal according to an embodiment of the present invention.

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

First, referring to FIG. 11, the PMA wireless charging system charging system 1 includes a wireless power transmission module 10 and a wireless power reception module 100. As shown in FIG. 16, the wireless power receiving module 100 is built in a portable terminal 90 such as a smart phone and electrically connected to a battery, and the wireless power transmitting module 10 is a separate case not shown. It is provided in a state built into the back.

The wireless power transmission module 10 operates when the wireless power reception module 100 approaches and supplies power wirelessly to the wireless power reception module 100. The wireless power receiving module 100 charges the built-in battery of the portable terminal 90 with the power supplied as described above.

In FIG. 11, reference numerals 12 and 14 denote a hall sensor and a permanent magnet constituting an apparatus for detecting the proximity of the wireless power receiving module 100, and reference numeral 16 denotes a wireless charging antenna pattern for transmission.

As shown in FIG. 2, the PMA wireless charging method wireless power receiving module 100 according to an embodiment of the present invention includes an antenna unit 110, a shielding sheet 120, and an attractor 130.

The antenna unit 110 may include a portable electronic device such as a mobile phone, a PDA, a PMP, a tablet, or a multimedia device, and at least one antenna for transmitting or receiving a wireless signal to perform a predetermined function.

The antenna unit 110 may be composed of a circular, elliptical or rectangular flat coil wound in a clockwise or counterclockwise direction, and, as shown in FIG. 2, made of synthetic resin such as polyimide (PI) or PET. A conductor such as copper foil or the like may be patterned on the flexible circuit board 112 in a loop shape, or a loop-shaped metal pattern may be formed on the flexible circuit board using conductive ink. In this case, when the antenna pattern is formed as a metal pattern on the circuit board, the metal pattern may be formed on one side of the circuit board or on both sides. In addition, although the drawing shows that the antenna pattern is formed on the upper surface of the circuit board, it is not limited thereto, and it should be noted that the antenna pattern may be formed on the lower surface of the circuit board.

The antenna unit 110 transmits power by using an inductive coupling method based on an electromagnetic induction phenomenon through a received wireless power signal, and a part that plays the role of a receiving coil and other parts described below It may be provided in a combo type configured as described above.

That is, the antenna unit 110 is composed of a flat-type coil and performs different roles such as wireless power charging and short-range communication, for wireless power transfer, magnetic secure transmission (MST), and near field communication (NFC). It may be a combo type including two or more of the flat-type coils for, and at least two of the antenna pattern 114a for wireless charging, the MST antenna pattern 114b, and the NFC antenna pattern 114c on one surface of the substrate 112 It may be a combo type equipped with this.

As an example, the antenna unit 110 includes the wireless charging antenna pattern 114a among the wireless charging antenna pattern 114a, the MST antenna pattern 114b, and the NFC antenna pattern 114c on one surface of the substrate 112. It may be provided to include at least one antenna pattern including.

Here, since the NFC antenna pattern 114c has a higher frequency band than the wireless charging antenna pattern 114a, it is formed as a conductive pattern in a rectangular shape having a fine line width along the outer edge of the substrate 112, and the antenna pattern for wireless charging ( 114a) requires power transmission and uses a lower frequency band than NFC, and thus may be formed with a line width wider than that of the NFC antenna pattern 114c inside the NFC antenna pattern 114c.

However, the positions of the NFC antenna pattern 114c and the wireless charging antenna pattern 114a are not limited thereto, and the arrangement relationship may be appropriately changed according to design conditions.

Meanwhile, the substrate 112 is an element that serves as a substrate on which at least one antenna pattern 114a, 114b, and 114c and a circuit portion are formed on the upper surface thereof, and is a material having heat resistance and pressure resistance, and having flexibility. In consideration of the physical properties of such a material, a polyimide film, which is a thermosetting polymer film, may be employed as the substrate 112.

The shielding sheet 120 is made of a plate-shaped member having a predetermined area, and serves to shield a magnetic field generated by a radio signal generated from the antenna unit 110.

The shielding sheet 120 may have a structure in which a plurality of thin magnetic sheets are provided and stacked.

Here, as the magnetic sheet of the thin plate, a thin ribbon sheet 121a and a ferrite sheet 121b made of an amorphous alloy or a nanocrystalline alloy may be used.

That is, the shielding sheet 120 may be a shielding sheet 120 ′ composed of only a thin ribbon sheet 121a made of an amorphous alloy or a nanocrystalline alloy as shown in FIG. 7A, and as shown in FIG. 7B. It may be a shielding sheet 120" in which one ferrite sheet 121b and a thin ribbon sheet 121a made of two amorphous alloys or nanocrystalline alloys are stacked.

Here, the amorphous alloy or nano-crystalline alloy may be an Fe-based or Co-based magnetic alloy, and may include a three-element alloy and a five-element alloy. For example, the three-element alloy may include Fe, Si and B, and the five-element alloy may include Fe, Si, B, Cu, and Nb.

In addition, the ferrite sheet 121b may be formed of a sintered ferrite sheet such as Mn-Zn ferrite or Ni-Zn ferrite. However, it should be noted that the magnetic sheet of the thin plate is not limited to the type mentioned above, and any material having magnetic properties can be used.

In this case, the shielding sheet 120 disposed on the upper side of the antenna unit 110 may fix the antenna unit 110 through an adhesive layer.

Here, the adhesive layer may be a bond, PVC, rubber, or double-sided tape having adhesive properties, and may include a component having conductivity. Meanwhile, although not shown, the antenna unit may have a separate substrate such as PI or PET, and the substrate and the shielding sheet may be attached.

On the other hand, on one surface of the shielding sheet 120, when the wireless power receiving module 100 approaches the wireless power transmitting module 10, a part of the magnetic line of force generated from the wireless power transmitting module 10 is guided and the path of the magnetic flux The attractor 130 is provided to induce a change in the voltage value of the hall sensor 12 that satisfies the operation start condition of the wireless power transmission module 10 by changing the.

As shown in FIGS. 2 and 3, the attractor 130 is disposed at a position corresponding to the central space of the antenna unit 110, and a magnetic piece 131 of a thin plate such as a plate-shaped sheet or film member And an anti-oxidation member 134 for preventing separation of fine pieces and covering at least a portion of the magnetic piece 131 of the thin plate.

At this time, the magnetic piece 131 of the thin plate is at least one side of the size of the central space of the antenna unit 110 so as to secure a maximum area from the size of the allowed wireless power receiving module 100 to obtain high efficiency. It can be formed in the same size.

Here, the attractor 130 may be attached to one surface of the shielding sheet 120 and provided as a shielding unit integrated with the shielding sheet 120, or attached to one surface of the antenna unit 110 to provide the antenna It may be provided in a form that is integrated with the unit 110.

Through this, since the attractor 130 is integrated with the shielding sheet 120 or the antenna unit 110 to be configured as a single component, wireless power is achieved through a simplified process when the shielding sheet 120 and the antenna unit 110 are combined. Since the receiving module 100 can be manufactured, manufacturing cost can be reduced through simplification of the assembly process.

Meanwhile, the attractor 130 according to an embodiment of the present invention has a thickness of 100 µm to 300 µm so that the total thickness of the wireless power receiving module 100 is 0.6 mm or less, or even 0.3 mm or less. , Preferably, it may be provided as a magnetic piece 131 of a thin plate having a thickness of 150㎛ ~ 220㎛.

At this time, the magnetic piece 131 of the thin plate may be provided to have a permeability in the range of 100 to 1000, preferably 900.

For example, the magnetic piece 131 of the flake may be a ribbon sheet of a thin plate made of an amorphous alloy or a nanocrystalline alloy. In addition, the magnetic piece 131 of the thin plate may be composed of a ribbon sheet made of a single-layer amorphous alloy or a nanocrystalline alloy, but may be composed of a stacked form of a ribbon sheet made of a plurality of amorphous alloys or nanocrystalline alloys. . Here, as the amorphous alloy, an Fe-based or Co-based magnetic alloy may be used.

Preferably, the magnetic piece 131 is constituted by laminating at least three or more layers of a thin ribbon sheet made of an amorphous alloy or a nanocrystalline grain alloy having a high permeability, and more preferably, a thin plate made of an amorphous alloy or a nanocrystalline grain alloy. Ribbon sheets may be configured by stacking 5 or 7 layers.

That is, as shown in Figures 4 and 5, the magnetic piece 131 is a thin ribbon sheet (130a, 130b, 130c, 130d, 130e, 130f, 130g) made of a seven-layer amorphous alloy or a nanocrystalline alloy. It is sequentially stacked through the adhesive layer 130h. In this case, removable release films 139a and 139b may be provided on at least one of the upper and lower surfaces of the magnetic piece 131.

In addition, the ribbon sheets 130a, 130b, 130c, 130d, 130e, 130f, 130g of a plurality of amorphous alloys or nanocrystalline alloys constituting the magnetic piece 131 are formed of a plurality of fine pieces to suppress the generation of eddy currents. It may be formed separately, and a plurality of fine pieces may be provided to be insulated entirely or partially between adjacent fine pieces.

At this time, the plurality of fine pieces may be provided in a size of 1 μm to 3 mm, and each piece may be formed randomly in an irregular shape.

Here, when the magnetic piece 131 is composed of a stack of ribbon sheets made of a plurality of amorphous alloys or nanocrystalline alloys, each adhesive layer 130h disposed between the ribbon sheets of amorphous alloys or nanocrystalline alloys is a non-conductive material It can be made of. That is, the adhesive layer 130h may penetrate into a ribbon sheet of a pair of amorphous alloys or nano-crystal alloys stacked on each other and move between the plurality of fine pieces to insulate the plurality of fine pieces.

However, it should be noted that the material of the magnetic piece 131 constituting the attractor 130 is not limited thereto, and any material having magnetic properties such as silicon steel, ferrite, permalloy, or polymer may be used.

In addition, it should be noted that the thickness and permeability of the magnetic pieces of the thin plate constituting the attractor are not limited to the above-mentioned conditions, and may be provided to have various thicknesses and permeability according to design conditions.

The micro-splinter preventing and oxidation preventing member 134 is attached to the magnetic piece 131 via an adhesive layer 135 so that at least a side surface of the magnetic piece 131 is not exposed to the outside.

That is, the micro-segment detachment prevention and oxidation-prevention member 134 prevents the side surface of the magnetic piece 131 from being exposed to the outside, thereby preventing the exposed surface from being oxidized and preventing the fine pieces from being separated from the side surface. do.

This is a process of manufacturing a ribbon sheet of each amorphous alloy or nanocrystalline alloy when the magnetic piece 131 is formed by stacking a plurality of ribbon sheets of amorphous alloy or nanocrystalline alloy. It becomes the punching surface formed in Accordingly, when fine pieces such as ribbon pieces are separated from the punching surface, the separated fine pieces cause a short in the electronic circuit.

In the present invention, the micro-splinter prevention and oxidation prevention member 134 is provided to surround the side of the magnetic piece 131 corresponding to the punching surface, so that the fine pieces are burned by the micro-splinter prevention and oxidation prevention member 134. It is to prevent separation from the side of the magnetic piece 131 as the foot surface.

Accordingly, even if the magnetic piece 131 constituting the attractor 130 is made of a material containing a metal component, such as an amorphous alloy or a nano-crystalline alloy, fine pieces are prevented from being separated from the side which is the punching surface and separated from By preventing oxidation through contact with air and/or moisture, it is possible to increase the reliability of the product and prevent the occurrence of a short in the electronic circuit due to the detached fine pieces.

Here, the adhesive layer 135 applied on one surface of the anti-oxidation and prevention member 134 is a vision so that the fine pieces separated from the side of the magnetic piece 131 can be kept adhered to the punching surface. It may be provided with an adhesive containing a conductive component.

In addition, the micro-splinter preventing and oxidation preventing member 134 may be provided in a liquid or gel form and applied to the side of the magnetic piece 131 through dipping, spraying, printing, etc. For convenience, it is preferable to be provided in the form of a sheet of film.

On the other hand, when the micro-splinter prevention and oxidation prevention member 134 is provided in the form of a protective film, the protective film may be a polyethylene terephthalate (PET) film, a polypropylene (PP) film, or a polyterephthalate (PTFE). A fluororesin film or the like may be used.

Hereinafter, it will be described that the micro-splinter preventing and oxidation preventing member 134 is provided in the form of a film and is attached to the magnetic piece 131 through an adhesive layer 135 as a medium.

As shown in Figs. 2 to 4, the micro-splinter prevention and oxidation prevention member 134 includes a second area 134b covering at least a side surface of the magnetic piece 131, and the manufacturing process is convenient. And a first region 134a covering an upper surface of the magnetic piece 131 in order to increase adhesion.

At this time, the second region 134b covering the side surface of the magnetic piece 131 has a width of 1 to 3 times the total thickness of the magnetic piece 131 so as to completely cover the side surface of the magnetic piece 131 as an exposed surface. It may be provided to have, and preferably may be provided to have a width of 1 to 2.5 times the total thickness of the magnetic piece 131.

For example, when the magnetic piece 131 has a thickness of 210 μm, the second area 134b may be provided to have a width of 210 to 630 μm, and preferably, the second area 134b is 300 It may be provided to have a width of ~500㎛. This is to increase reliability and increase mass production by allowing the second region 134b to completely surround the side surface of the magnetic piece 131 even if an error occurs during a manufacturing process such as a punching process. If the width of the second area 134b is smaller than the thickness of the magnetic piece 131, a problem occurs in that the side surface of the magnetic piece 131 cannot be completely covered, and the width of the second area 134b When the width of the magnetic piece 131 is three times or more than the thickness of the magnetic piece 131, a problem of lowering the adhesive strength during attaching the shielding sheet 120 and/or the antenna unit 110 and the attractor 130 occurs.

On the other hand, it should be noted that the micro-splinter preventing and oxidation preventing member 134 may be provided to cover only the side surface of the magnetic piece 131 as shown in FIG. 5.

In the drawings and description, it is illustrated and described that the micro-splinter preventing and oxidation preventing member 134 is provided on the side and/or upper surface of the magnetic piece 161, but is not limited thereto and When the foot surface or the exposed surface is the upper surface and/or the lower surface, it should be noted that a micro-splinter prevention and oxidation prevention member may be provided on the upper surface and/or lower surface of the magnetic piece corresponding to the punching surface or the exposed surface.

On the other hand, in order to wirelessly charge through the PMA wireless charging method, when the wireless power transmission module 10 approaches the wireless power receiving module 100, the hall sensor 12 provided at the wireless power transmission module 10 side The change in voltage value must occur beyond a certain level.

That is, when the hall sensor 12 detects a change in the voltage value beyond a certain size, it is recognized that the wireless power receiving module 100 has approached the wireless power transmitting module 10 side. In this way, when the hall sensor satisfies the operation start condition of the wireless power transmission module 10 through the change of the voltage value, the wireless power transmission module 10 is operated so that a high frequency signal is transmitted to the wireless power transmission module 10 ) Is transferred to the wireless power receiving module 100 to be charged.

In order to satisfy these conditions, the overall thickness of the attractor 130, in particular, the total thickness of the magnetic piece 131 is increased to increase the induction rate of the magnetic force line generated from the permanent magnet 14, or the attractor 130 By increasing the entire area of the magnetic piece 131 constituting the magnetic piece 131 by increasing the induction rate of the magnetic force line generated from the permanent magnet 14, it is possible to increase the change value of the voltage generated by the Hall sensor 12.

However, increasing the total area of the attractor 130 is limited because the overall size of the wireless power receiving module 100 is determined.

In addition, when the wireless power receiving module 100 is applied to an electronic device such as a mobile phone, the total thickness of the wireless power receiving module 100 must be limited to meet the demand for light, thin, short and miniaturization of the electronic device. Due to this, the total thickness of the attractor that changes the path of the magnetic flux generated from the permanent magnet is also limited.

In particular, when the total thickness of the wireless power receiving module 100 is limited to 0.6mm or less, even 0.3mm or less, the total thickness of the available attractor is bound to be more severely restricted.

In the present invention, even under the condition that the total thickness of the wireless power receiving module 100 is 0.15 to 0.6mm, specifically 0.3mm, the attractor 130 so that the change of the voltage value in the Hall sensor can be changed to a certain size or more. ) May be provided to have a sufficient thickness.

To this end, at least one side of the magnetic field shielding sheet 120 and the antenna unit 110 is provided with an attractor accommodating portion 140 for accommodating at least a portion of the total thickness of the attractor 130.

Such an attractor receiving unit 140 accommodates at least a portion of the total thickness of the attractor 130 disposed between the magnetic field shielding sheet 120 and the antenna unit 110, so that the wireless power receiving module 100 Even if the overall thickness is reduced, it is possible to use the attractor 130 having a sufficient thickness.

For example, the attractor accommodating part 140 may be provided in the form of an accommodating groove that is depressed at a predetermined depth inward from at least one surface of the magnetic field shielding sheet 120 or the antenna unit 110.

That is, the attractor accommodating portion 140 may be provided in the form of an accommodating groove that is recessed to a predetermined depth only on one surface of the magnetic field shielding sheet 120 as shown in FIG. 3. In this case, when the magnetic field shielding sheet 120 is formed of a plurality of layers as shown in FIGS. 7A and 7B, the receiving groove may be formed to have a height corresponding to the rest of the layers except for the uppermost layer of the plurality of layers. . Through this, while increasing the overall thickness of the attractor 130, it is possible to prevent the attractor 130 from being exposed to the outside through the uppermost layer constituting the magnetic field shielding sheet.

In addition, the attractor accommodating part 140 may be provided in the form of an accommodating groove recessed to a predetermined depth on each side of the magnetic field shielding sheet 120 and the antenna unit 110 as shown in FIG. 8A. .

In addition, although not shown, the receiving groove may be recessed to a predetermined depth only on one surface of the antenna unit 110.

Meanwhile, the attractor accommodating part 140 may be formed in the form of a through hole penetrating at least one of the magnetic field shielding sheet 120 or the antenna unit 110. In this way, when the attractor receiving part 140 is provided in the form of a through hole, a separate sealing sheet for preventing the attractor inserted into the through hole from being exposed to the outside on one surface of the magnetic field shielding sheet or the antenna unit ( 150) may be provided.

Here, when the sealing sheet 150 is provided on one surface of the shielding sheet 120, the attractor 130 inserted into the through hole may be directly fixed through the sealing sheet 150 and an adhesive layer.

On the other hand, it should be noted that the sealing sheet 150 may be a heat dissipation sheet, may be provided to cover one surface of the magnetic field shielding sheet or the antenna unit as a whole, or may be partially provided including the open area of the through hole. .

In addition, the attractor receiving part 140 may be provided in the form of a through hole formed through only the magnetic field shielding sheet as shown in FIG. 8B, and the magnetic field shielding sheet 120 as shown in FIG. 8C And it may be provided in the form of two through holes formed through each of the antenna unit 110. In this case, since the thickness of the attractor can be formed to have the same thickness as the thickness of the wireless power receiving module, the attractor may have a thickness of 0.15 to 0.6 mm equal to the total thickness of the wireless power receiving module. .

In addition, although not shown, the through hole may be formed only in the antenna unit 110.

Meanwhile, the attractor 130 ′ according to the present invention may have a multi-stage structure in which the magnetic pieces 131 ′ of a thin plate have different cross-sectional areas, as shown in FIGS. 9A to 9C. That is, the magnetic piece 131 ′ has a first portion 131a having a relatively large cross-sectional area and a relatively narrow cross-sectional area to be provided as a second portion 131b stacked on one surface of the first portion 131a. I can.

Here, when the magnetic piece 131 ′ is provided as a first portion 131a and a second portion 131b having different cross-sectional areas, the second portion 131b is shown in FIG. 10A. As shown in FIG. 10(b) to 10(e), the first part (e) may be disposed in the center of the first part 131a and stacked symmetrically based on the virtual center line. 131a) may be stacked asymmetrically by being biased to one of the top, bottom, left, and right sides.

In addition, when the magnetic piece 131 ′ is provided in a multi-stage structure, the micro-splinter prevention and oxidation prevention member 134 may be formed on the upper and side surfaces of the second part 131b and the first part 131a. It may be provided to cover part of the upper surface and the side surface through one member (see FIGS. 9A to 9C ).

In this way, when the attractor 130 ′ includes a magnetic piece 131 ′ having a multi-stage structure having different cross-sectional areas, the attractor receiving portion 240 is also provided to correspond to the attractor 130 ′. It is provided with a first receiving portion 141 and a second receiving portion 142 (see FIGS. 9A to 9C).

Through this, when the attractor 130 ′ is inserted into the attractor receiving part 240, the attractor 130 ′ is transferred to the attractor receiving part 240 through the second part 131b having a relatively narrow area. ) Can be prevented from being separated from the outside, and even if a separate adhesive layer is not used, the attractor 130 ′ can maintain its original position.

9A to 9C illustrate various forms in which the attractor 130 ′ and the attractor accommodating part 240 have a multi-stage structure.

That is, as shown in FIG. 9A, the attractor receiving portion 240 may be provided in the form of a through hole penetrating the magnetic field shielding sheet 120, and the magnetic field shielding sheet 120 as shown in FIG. 9B It may be provided in the form of a receiving groove that is depressed to a certain depth from one side of the inside.

In this case, the attractor receiving portion 140 may be provided in the form of a through hole as shown in FIG. 9C also on the side of the antenna unit 110. In addition, although not shown, the antenna unit 110 may also include an attractor receiving portion provided in the form of a receiving groove.

On the other hand, when the magnetic piece 131 ′ is provided in a multi-stage structure, the first part 131a having a relatively wide cross-sectional area is located closer to the antenna unit 110 when stacked with the antenna unit 110 It is formed so as to be located in the wireless power transmission module 10 when approaching to increase the area facing the permanent magnet. In addition, it is preferable that the first portion 131a is formed to have a relatively larger thickness than the second portion 131b.

As described above, the wireless power receiving module 100 and 200 according to an embodiment of the present invention is provided with the attractor 130 and 130 ′ through the attractor receiving portions 140 and 240 provided on at least one side of the magnetic field shielding sheet 120 or the antenna unit 110. ), it is possible to increase the total thickness of the attractors 130 and 130' even if the total thickness of the wireless power receiving module 100 is not increased by accommodating at least a portion of the total thickness.

For this reason, when the total thickness of the wireless power receiving module 100 is 0.15mm to 0.6mm, preferably 0.3mm, the attractor also has a thickness of 0.15mm to 0.6mm in the same way as the wireless power receiving module 100. By having it, it is possible to sufficiently change the path of the magnetic field line of the permanent magnet 14 due to an increase in the thickness of the attractor, so that a change in the operating voltage value in the Hall sensor required by the PMA wireless charging method can be stably detected ( See Fig. 11).

Here, the total thickness (t) of the wireless power receiving module may be the stacking height of the antenna unit 110, the attractors 130 and 130', and the shielding sheet 120, and graphite on the upper surface of the shielding sheet 120 When the heat dissipation sheet 122 is provided, it may have a thickness including the heat dissipation sheet 122.

In addition, although the thickness of 0.15 ~ 0.6mm is illustrated as the total thickness of the wireless power receiving module 100, it should be understood that the total thickness of the wireless power receiving module has a thin thickness, and the wireless power receiving module 100 It should be noted that this does not limit the overall thickness of ).

That is, even if the total thickness of the wireless power receiving module 100 is limited in the PMA wireless charging method, the wireless power receiving module required by accommodating at least some of the total thickness of the attractor used through the above-described attractor receiving unit While satisfying the thickness, all conditions and characteristics required by the PMA wireless charging method can be stably satisfied or implemented.

The PMA wireless charging method wireless power receiving modules 100 and 200 according to an embodiment of the present invention may be installed inside the rear case or back cover of the portable terminal 90 as shown in FIG. 16.

In addition, the PMA wireless charging method wireless power reception module 100 according to an embodiment of the present invention is a PMA including a wireless power transmission module 10 and a wireless power reception module 100, as shown in FIG. It may also be applied to the wireless charging system charging system (1).

Hereinafter, a method of manufacturing an attractor for a wireless power receiving module according to an embodiment of the present invention will be described in detail with reference to FIG. 12.

First, a plurality of sheets (130a, 130b, 130c, 130d, 130e, 130f, 130g) manufactured through heat treatment are prepared. Here, the plurality of sheets 130a, 130b, 130c, 130d, 130e, 130f, 130g may be formed of a thin ribbon sheet made of an amorphous alloy or a nanocrystalline alloy having high magnetic permeability. In addition, at least three of the plurality of ribbon sheets may be used, and preferably seven may be used.

Next, the plurality of ribbon sheets (130a, 130b, 130c, 130d, 130e, 130f, 130g) are sequentially stacked to form a stack (A). At this time, an adhesive layer 130h is disposed between a pair of adjacent ribbon sheets, so that the laminate is integrated through the adhesive layer 130h.

Here, the adhesive layer 130h may include a non-conductive component, and removable release films 139a and 139b may be attached to the upper and lower surfaces of the laminate.

Thereafter, the stacked body is passed through a flake device (not shown) to suppress the occurrence of eddy current so that each of the ribbon sheets constituting the stacked body A can be separated into a plurality of fine pieces. Here, the separated plurality of fine pieces are prevented from being separated from the outside through the release films 139a and 139b attached to the upper and lower surfaces of the laminate.

In this case, the adhesive layer 130h disposed between the adjacent ribbon sheets permeates into the ribbon sheet layer, so that the plurality of fine pieces constituting each ribbon sheet are insulated entirely or partially insulated.

For example, the flake device may be composed of a metal roller having a plurality of irregularities formed on an outer surface thereof, and a rubber roller disposed on one side of the metal roller, and the irregularities in the process of passing the laminate between the metal roller and the rubber roller It can be separated into a plurality of pieces by. In this case, the plurality of fine pieces may pass through the stacked body multiple times through the flake device to have a size of 1 μm to 3 mm, and each piece may be formed in an irregular shape.

Here, the laminate (A) in which a plurality of ribbon sheets are stacked may be subjected to a hot pressing process for flattening and slimming. Through this, the overall thickness of the laminate (A) is reduced and it is possible to maintain a constant thickness.

After preparing a plate-shaped laminate (A) having a predetermined width through the above-described process, a carrier film 170 is attached to one side of the laminate (A) via an adhesive layer 174 (Fig. 12(a)). ) And Fig. 12(b)). Thereafter, the plate-shaped laminate (A) attached to one surface of the carrier film 170 is separated into a plurality of magnetic pieces 131 through a punching process (see Fig. 12(c)), and the plurality of magnetic pieces The remaining portion (A') except for 131 is removed from the carrier film 170 (see FIG. 12(d)).

Accordingly, on one surface of the carrier film 170, a plurality of magnetic pieces 131 separated into a predetermined size having a predetermined area (hereinafter referred to as'first area (plural fines)') are spaced at a predetermined interval. The plurality of magnetic pieces 131 are left in an arranged state, and the plurality of magnetic pieces 131 are maintained in an aligned state by maintaining a state attached to the carrier film 170 through the adhesive layer 174.

Here, if a release film (see 139a in FIG. 5) is attached to the uppermost side of the laminate (A) before punching the plate-shaped laminate (A), a punching process may be performed after removing the release film, The punching process may be performed while the release film is attached.

Thereafter, the plate-shaped film member B is attached to cover the plurality of magnetic pieces 131 separated from each other at the same time (see FIG. 12(e)). Here, the film member (B) is attached to the plurality of magnetic pieces 131 through an adhesive layer 175 applied to one surface, and is separated into a plurality of protective films 134 through a punching process to form the magnetic By covering the side surface of the piece 131, the powder is prevented from being removed and oxidation is prevented.

To this end, the film member (B) is attached to the film member (B) to cover the plurality of magnetic pieces 131 at the same time, and the film member (B) is a predetermined area (hereinafter referred to as'second area (S2)') Separated into a plurality of protective films 134 separated into a predetermined size having a, and the remaining portions except for the plurality of protective films 134 are removed from the carrier film 170 (see (f) of FIG. 12).

Here, the plurality of protective films 134 includes a first area 134a and a second area 134b, and the first area S1 corresponds to the area of the first area 134a, and The second area S2 corresponds to the sum of the first area 134a and the second area 134b.

At this time, the plurality of protective films 134 are punched to have a larger area than the upper surface of the magnetic piece 131. That is, the second area S2 is provided to have a larger area than the first area S1, and a portion of the second area that exceeds the first area is 1 to 2 than the thickness of the magnetic piece 131 It may be provided to have a width of 3 times, preferably may be provided to have a width of 1 to 2.5 times the thickness of the magnetic piece 131.

As an example, when the magnetic piece 131 has a thickness of 210 μm, a portion of the second area S2 that exceeds the first area may be provided to have a width of 210 to 630 μm, preferably the A portion of the second area S2 that exceeds the first area may be provided to have a width of 300 to 500 μm.

This allows a portion of the second area S2 that exceeds the first area to completely surround the side of the magnetic piece 131 even if an error occurs in the manufacturing process such as punching process, thereby increasing reliability and mass production. It is to increase.

If, among the second area S2, the width of the portion exceeding the first area is smaller than the thickness of the magnetic piece 131, a problem of not completely covering the side of the magnetic piece occurs, and the second area ( If the width of the portion exceeding the first area of S2) has a width of 3 times or more than the thickness of the magnetic piece 131, the shielding sheet 120 and/or the antenna unit 110 and the attractor 130 are attached. In the process, a problem of deteriorating adhesion occurs.

Here, the film member (B) may be a polyethylene terephthalate (PET) film, a polypropylene (PP) film, a fluororesin film such as polyterephthalate (PTFE), or the like.

Finally, a carrier film 170 in a state in which a plurality of magnetic pieces 131 are attached to one surface of the carrier film 170, and a protective film 134 is attached to the upper surface of the plurality of magnetic pieces 131, respectively. ) Is pressed through a rolling process, each protective film 134 is compressed by the pressing force to surround the side surface of the magnetic piece 131, and a portion of the protective film 134 exceeding the first area The final attractor 130 is completed by being completely in close contact with the side surface of the magnetic piece 131 through the adhesive layer 175 (see FIG. 12(g)).

Through this, the magnetic piece 131 prevents the exposed side from being exposed to the outside by preventing the exposed surface from being oxidized, while preventing particles such as ribbon pieces from falling off from the punching surface. It prevents the occurrence of a short circuit in the electronic circuit through the separated particles.

Thereafter, in the use process, the attractor 130 is individually separated from the carrier film 170 so that it can be applied to a product.

Meanwhile, another method of manufacturing an attractor for a wireless power receiving module according to an embodiment of the present invention is shown in FIGS. 13 to 15.

That is, the other manufacturing method of the attractor for a wireless power receiving module according to an embodiment of the present invention, unlike the above-described manufacturing method, a punching process for forming a plurality of magnetic pieces 131 and a plurality of protective films 134 After each punching process for constitution is performed, the plurality of magnetic pieces 131 and the protective film 134 which have been punched out are laminated to each other.

Here, the process of preparing the stacked body A, which is the raw material of the plurality of magnetic pieces 131, is the same as the above-described process, and thus will be omitted.

First, a process of separating the stacked body A into a plurality of magnetic pieces 131 will be described with reference to FIG. 13.

After preparing a plate-shaped laminate (A) having a predetermined width, a first carrier film 171 is attached to one side of the laminate (A) through an adhesive layer 174 (Fig. 13(a) and Figs. 13 (b)).

Thereafter, the plate-shaped laminate (A) attached to one surface of the first carrier film 171 is separated into a plurality of magnetic pieces 131 through a punching process (see Fig. 13(c)), and the plurality of The remaining portion (A') except for the magnetic piece 131 is removed from the first carrier film 171 (see FIG. 13(d)).

Accordingly, on one surface of the first carrier film 171, a plurality of magnetic pieces 131 separated into a predetermined size having a predetermined area (hereinafter referred to as'first area S1') are spaced at predetermined intervals. The plurality of magnetic pieces 131 remain in an arranged state, and the plurality of magnetic pieces 131 are maintained in an aligned state by maintaining a state attached to the first carrier film 171 through the adhesive layer 174.

Here, if a release film (see 139a in FIG. 5) is attached to the uppermost side of the laminate (A) before punching the plate-shaped laminate (A), a punching process may be performed after removing the release film, The punching process may be performed while the release film is attached.

Next, a process of separating the plate-shaped film member B into a plurality of protective films 134 will be described with reference to FIG. 14. Here, the film member (B) may be a polyethylene terephthalate (PET) film, a polypropylene (PP) film, a fluororesin film such as polyterephthalate (PTFE), or the like.

First, after preparing a plate-shaped film member (B) having a predetermined width, a second carrier film 172 is attached to one surface of the film member (B) via an adhesive layer 175 (Fig. 14(a)). And Fig. 14(b)). Here, the adhesive layer 175 may be a double-sided tape coated with an adhesive on both sides of the substrate.

Thereafter, the plate-shaped film member (B) attached to one surface of the second carrier film 172 is separated into a plurality of protective films 134 through a punching process (see Fig. 14(c)), and the plurality of The remaining portion (B') except for the protective film 134 is removed from the second carrier film 172 (see Fig. 14(d)).

Accordingly, on one surface of the second carrier film 172, a plurality of protective films 134 separated by a predetermined size having a second area S2 remain in a state disposed at a predetermined interval, and the plurality of protection films The film 134 maintains an aligned state by maintaining a state attached to the second carrier film 172 through the adhesive layer 175.

At this time, the plurality of protective films 134 are punched to have a larger area than the upper surface of the magnetic piece 131. That is, the second area S2 is provided to have a larger area than the first area S1, and a portion of the second area S2 that exceeds the first area S1 is the magnetic piece 131 ) May be provided to have a width of 1 to 3 times the thickness, and preferably may be provided to have a width of 1 to 2.5 times the thickness of the magnetic piece 131.

As an example, when the magnetic piece 131 has a thickness of 210 μm, a portion of the second area S2 that exceeds the first area may be provided to have a width of 210 to 630 μm, preferably the A portion of the second area S2 that exceeds the first area S1 may be provided to have a width of 300 to 500 μm.

This allows a portion of the second area S2 that exceeds the first area to completely surround the side of the magnetic piece 131 even if an error occurs in the manufacturing process such as punching process, thereby increasing reliability and mass production. It is to increase.

If, among the second area S2, the width of the portion exceeding the first area is smaller than the thickness of the magnetic piece 131, a problem of not completely covering the side of the magnetic piece occurs, and the second area ( If the width of the portion exceeding the first area of S2) has a width of 3 times or more than the thickness of the magnetic piece 131, the shielding sheet 120 and/or the antenna unit 110 and the attractor 130 are attached. In the process, a problem of deteriorating adhesion occurs.

Thereafter, a third carrier film 173 having a certain area and provided with an adhesive layer 176 on one surface is attached to cover the plurality of protective films 134 at the same time (Fig. 14(e) and Fig. 14(f)). ) Reference).

Then, the second carrier film 172 disposed on the opposite side of the third carrier film 173 is removed from the plurality of protective films 134 (see FIG. 14(g)). At this time, only the second carrier film 172 is removed from one surface of the plurality of protective films 134 so that the adhesive layer 175 is not removed and maintained.

Next, after disposing the first carrier film 171 and the third carrier film 173 so that the plurality of magnetic pieces 131 and the plurality of protective films 134 face each other (see FIG. 15(a)) ), the first carrier film 171 and the third carrier film 173 are laminated to each other (see FIG. 15B). At this time, since the adhesive layer 175 is attached to one surface of the protective film 134, the plurality of magnetic pieces 131 and the plurality of protective films 134 are attached to each other through the adhesive layer 175 as a medium.

Then, the third carrier film 173 is removed so that the protective film 134 individually covering the upper surface of the magnetic piece 131 can be exposed to the outside (see Fig. 15(c)). .

Finally, a carrier film in a state in which a plurality of magnetic pieces 131 are attached to one surface of the first carrier film 171, and a protective film 134 is attached to the upper surface of the plurality of magnetic pieces 131, respectively. When 171 is pressed through a rolling process, each of the protective films 134 is compressed by the pressing force to surround the side of the magnetic piece 131, and the first area (S1) of the protective film 134 The final attractor 130 is completed by completely contacting the side surface of the magnetic piece 131 through the adhesive layer 175 (see FIG. 15(d)).

Through this, the magnetic piece 131 prevents the exposed side from being exposed to the outside by preventing the exposed surface from being oxidized, while preventing particles such as ribbon pieces from falling off from the punching surface. It prevents the occurrence of a short circuit in the electronic circuit through the separated particles.

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Although an embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiment presented in the present specification, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same idea. It will be possible to easily propose other embodiments by changing, deleting, adding, etc., but it will be said that this is also within the scope of the present invention.

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100: PMA wireless charging method wireless power receiving module
110: antenna unit 112: substrate
114a: antenna pattern for wireless charging 114b: MST antenna pattern
114c: NFC antenna pattern 120,120',120": shielding sheet
121a: a thin ribbon sheet made of an amorphous alloy or a nano-crystal alloy
121b: ferrite sheet 122: heat dissipation sheet
130,130': Attractor
130a,130b,130c,130d,130e,130f,130g: Sheet
130g: adhesive layer 131,131': magnetic piece
131a: first part 131b: second part
134: prevention of detachment of fine pieces and member to prevent oxidation
134a: first region 134b: second region
135: adhesive layer 140,240: attractor receiving portion
141: first accommodation unit 142: second accommodation unit
150: sealing sheet 170,171,172,173: carrier film
A: Laminate B: Film member

Claims (24)

In the attractor of the wireless power receiving module,
A thin magnetic piece made of at least one layer of magnetic material; And
It is provided on the magnetic thin plate piece, micro-sculpture detachment prevention and oxidation prevention member for preventing the separation of fine pieces from the punched surface of the magnetic thin plate or the punching surface is oxidized; includes,
The micro-splinter prevention and oxidation prevention member is a protective film,
The protective film is an attractor for a wireless power receiving module including a first region covering an upper surface of the thin magnetic piece and a second region extending from the first region and covering a side surface of the magnetic thin plate. The method of claim 1,
The attractor is provided in a wireless power receiving module so that it can be applied to a PMA wireless charging method, and when the wireless power receiving module approaches the wireless power transmitting module, it induces a part of the magnetic line of force generated in the wireless power transmitting module to reduce magnetic flux. The attractor for a wireless power receiving module to change a path to induce a change in a voltage value satisfying an operation start condition of the wireless power transmission module. The method of claim 1,
The punching surface is an attractor for a wireless power receiving module that is a side surface of the thin magnetic piece. The method of claim 1,
The microscopic piece detachment prevention and oxidation prevention member is directly attached to the thin plate magnetic piece through an adhesive layer containing a non-conductive component as a medium for a wireless power receiving module attractor. delete The method of claim 1,
The magnetic thin plate is an attractor for a wireless power receiving module having a magnetic permeability of 100 to 1000. The method of claim 1,
The magnetic piece of the thin plate is an attractor for a wireless power receiving module configured by stacking at least three layers of thin ribbon sheets made of an amorphous alloy or a nano-crystalline alloy. In the attractor of the wireless power receiving module,
A thin magnetic piece made of at least one layer of magnetic material; And
It is provided on the magnetic thin plate piece, micro-sculpture detachment prevention and oxidation prevention member for preventing the separation of fine pieces from the punched surface of the magnetic thin plate or the punching surface is oxidized; includes,
The magnetic thin plate is an attractor for a wireless power receiving module that is formed to have the same size as the size of a central space of an inner antenna pattern provided in the wireless power receiving module. The method of claim 1,
The thin magnetic piece is an attractor for a wireless power receiving module that has a thickness of 100 to 300 μm. An antenna unit having at least one antenna pattern;
A magnetic field shielding sheet for shielding a magnetic field generated by a radio frequency signal of the antenna unit; And
Includes; an attractor positioned between the antenna unit and the magnetic field shielding sheet,
The attractor is a wireless power receiving module which is an attractor for a wireless power receiving module according to any one of claims 1 to 4 and 6 to 9. delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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