TWM502239U - Thin-film coil component and charging apparatus - Google Patents

Abstract

The disclosure in accordance with the present invention is related to a thin-film coil component and a related charging apparatus. The thin-film coil component employs an adhesive layer to form a central structure of the component. In the manufacturing process, conductive thin-film materials are incorporated to acting as a substrate, and the adhesive layer is formed thereon. Two thin-film coil structures are formed upon two surfaces of the adhesive layer as patterning the conductive thin-film materials. A conductive connection member is formed through a perforation of the structure so as to electrically connect the two thin-film coil structures. A thin-film coil component is therefore produced. Multiple thin-film coil components are arranged to be a charging apparatus with application of electromagnetic induction technology.

Description

Film coil component and related charging device

The present invention is a coil element and related charging device, in particular, a film coil element formed by a film-shaped conductor coil structure, and a charging device formed by combining a plurality of film coil elements.

Wireless charging, also known as inductive charging or non-contact inductive charging, utilizes near-field sensing, that is, inductive coupling, to transfer energy to a powered device by a power supply device. The general technique is to provide a magnetic core in the charger and then to externally surround the copper coil. After being energized, an electromagnetic field can be generated in a certain direction. If an alternating current is applied, an alternating electromagnetic field can be generated, and if another electric coil is used in the electric device, the alternating current is received. The magnetic field can be converted into electrical energy and supplied to a powered device or charged to a rechargeable battery therein. Since the charger and the consumer are inductively coupled to transfer energy, there is no need for a wire connection.

The conventional coil design is shown in Figures 1A and 1B. FIG. 1A shows a coil of a general wireless charging module, the number of turns being three turns, and an induced electromagnetic field strength can be generated when one end is energized. In order to increase the intensity of the induced electromagnetic field, as shown in FIG. 1B, the number of turns of the planar coil can be increased to six turns, and the intensity of the induced electromagnetic field can theoretically be increased by a factor of two. However, this will increase the line length by more than two times, which affects the overall resistance of the coil and reduces the efficiency of wireless charging.

At the same time, wireless charging still has some shortcomings to be overcome, such as slightly lower efficiency, general charging There is also a transformer in the electric appliance, but the wireless charging is composed of the first coil and the second coil. Due to the structural limitation, the energy transmission efficiency is slightly lower than that of the general charger, and the power supply is firstly stepped down and rectified by an external circuit. After the voltage is regulated and then to the wireless charging module, the conversion efficiency is also limited by the design of the external circuit; the wireless charging method will cause the line resistance to increase due to the increase in the number of turns, and the heat is severe, which has the same problem as the conventional charger, even if It is a phenomenon that generates heat when it is being charged.

The present disclosure discloses a thin film coil component and a related charging device, wherein the thin film coil component is structurally formed with an adhesive layer as a central structure of the component, and the conductive film material is used as a substrate during the manufacturing process, and the adhesive layer is formed on the substrate. The film coil structure formed on the two surfaces of the adhesive layer by the patterning process is formed through the conductor connection portion of the adhesive layer, and the conductor connection structure is a thin film coil structure electrically connected to the two surfaces of the adhesive layer Then, a thin film coil component is formed, and then a plurality of thin film coil components can be combined to fabricate a charging device using the coil electromagnetic induction technology.

According to one of the embodiments, the film coil component comprises a bonding layer forming a central structure, wherein the material is mixed with a magnetic material, and the component comprises a first film coil formed on the first surface of the bonding layer by a spiral structure The first film winding is composed of a first connecting wire on the outer side of the first film winding, and a first winding end on the inner side; and a second film coil formed on the outer side of the adhesive layer On the surface, the second film winding is composed of a spiral structure, the second film winding has a second connection port on the outer side of the wire, and the inner side has a second wire end point.

A conductor connection portion may be electrically connected to each other between the first film coil and the second film coil, and the conductor connection portion penetrates the adhesive layer to connect the first winding end point and the second winding end point.

In this structure, the current between the first connection port and the second connection port of the film coils on both sides of the adhesive layer can form an induced electromagnetic field in the film coil component, and the adhesive layer mixed with the magnetic material can be increased. The induced current and induced electromotive force of the film winding.

In one embodiment, the first film winding formed on the two sides of the substrate and the central portion of the second film winding may also be formed with a thin film core.

According to the embodiment of the disclosure, the one or more thin film coil elements are combined to form a charging device for charging an electronic device having a corresponding coil, the charging device comprising one or more thin film coil elements, wherein each thin film coil element The main component has an adhesive layer mixed with a magnetic material, and a first film coil and a second film coil formed on both sides of the adhesive layer, and then a conductive connection portion penetrates the adhesive layer to electrically connect the first film coil With the second film coil. The charging device further includes a power management unit capable of managing and controlling the inductive power generated by the one or more thin film coil components in the charging device.

In order to further understand the techniques, methods and effects of this creation in order to achieve the intended purpose, please refer to the following detailed descriptions and diagrams of this creation. I believe that the purpose, characteristics and characteristics of this creation can be deepened and specific. The drawings and the annexes are provided for reference and description only, and are not intended to limit the present invention.

21‧‧‧First film coil

22‧‧‧Second film coil

201‧‧‧First film winding

202‧‧‧Second film winding

203‧‧‧First port

204‧‧‧Second connection

207‧‧‧First winding end point

208‧‧‧second winding end point

301‧‧‧Conductor connection

30‧‧‧ adhesive layer

401‧‧‧First conductive film substrate

401'‧‧‧First film coil

403‧‧‧bonding layer material

403'‧‧‧ adhesive layer

402‧‧‧Second conductive film material

402'‧‧‧Second film coil

405‧‧‧Conductor connection

407‧‧‧First port

408‧‧‧Second port

409‧‧‧First film core

410‧‧‧Second thin film core

400‧‧‧Protective layer

51,51’‧‧‧film coil

501‧‧‧film winding

503,503’‧‧‧Connector

505, 505' ‧ ‧ film core

507,507’‧‧‧ winding end

60‧‧‧ adhesive layer

601‧‧‧Conductor connection

70‧‧‧Substrate

701‧‧‧film coil components

703‧‧‧Power Management Unit

705‧‧‧Power supply

72‧‧‧Electronic devices

721‧‧‧Device-end thin film coil components

1A and 1B schematically show the form of a general copper coil; FIGS. 2A and 2B show a schematic view of an embodiment of a film coil in the present invention; FIG. 3 shows a schematic view of an embodiment of the inventive film coil component; and FIG. 4A to FIG. FIG. 5 is a schematic view showing an embodiment of a film coil having a magnetic core structure; FIG. 6 is a schematic cross-sectional view showing an embodiment of the present invention; FIG. schematic diagram.

The present invention proposes a thin film coil component which is a thin and electrically conductive thin film device through thin film technology, and the present invention also relates to the use of the thin film coil assembly. The charging device, in particular a film coil having a specific line width and being energized to generate an induced electromagnetic field, can be applied to a wirelessly charged high gain film coil design, and a plurality of film coils are combined to form a charging device.

It is worth mentioning that the film coil component proposed by the present invention uses an adhesive layer in the component to become the central structure of the film coil component, that is, the substrate structure which generally adopts plastic or a specific material is reduced, and the manufacturing process can be A conductive film material is a substrate, such as a metal foil, and then a bonding material is coated on the substrate, and another conductive film material is bonded to the other surface of the bonding material, and then formed by a patterning process. The thin film coil structure is formed on the two surfaces of the adhesive layer, and then the two thin film coil structures are connected by a conductor connecting portion penetrating the adhesive layer.

One example of the effect of the film design disclosed in the disclosure is that the increase in the number of turns does not significantly increase the overall resistance of the coil, which can effectively improve the charging efficiency, such as increasing the charging efficiency from 70% to More than 80%, and it is not easy to have fever. In addition, one of the embodiments of the film coil can thin the coil and be three-dimensional, which can contribute to the flexibility and miniaturization of the entire wireless charging device, such as a thinness of less than 0.5 mm.

2A is a schematic view showing an embodiment of a film coil in the present invention. The film coil of this example is a first film coil 21 having a spiral direction, and is composed of a first film winding 201 of a spiral structure to form a plurality of turns. Number of film coils. Preferably, the film winding is a film made of a conductive material, and adjacent structures in the spiral structure have a spacing so that electrical signals do not couple or affect each other. The outer side of the first film winding 201 has a connection port of the external (external circuit) connection, such as the first connection port 203 as shown, and the inner side has a winding end point, as shown by the first winding end point. 207.

In contrast, FIG. 2B is a schematic representation of a second film coil 22 having a spiral pattern opposite, consisting of a second film winding 202 of helical configuration, also having a spacing in adjacent structures, the spacing and the first film coil The structural spacing of 21 may be substantially the same, but may be inconsistent. Similarly, the second film winding 202 has a second connection port 204 externally connected to the outside, and the inner terminal has a second winding end point 208.

In the thin film coil (the first thin film coil 21 and the second thin film coil 22), electric power is supplied, and current is supplied to the outer connecting port of each coil (the first connecting port 203 and the second connecting port 204) to the winding end point (the first A winding end point 207 and a second winding end point 208) can form an induced electromagnetic field.

In design, the first film coil 21 and the second film coil 22 may have the same or different pitches of adjacent windings in the spiral structure under actual demand, and may also include the same number of turns or different turns, even the coil area. It can also be different.

In the material, the film windings (201, 202) forming the first film coil 21 and the second film coil 22 are preferably a flexible copper film, and in actual implementation, the material is not limited to copper. The spiral structure of the film coil is a rectangular spiral structure or a circular spiral structure, and in actual implementation, it is not limited to the above shape.

According to the embodiment, if the above-mentioned thin film coil is combined, for example, the first and second thin film coils are respectively combined on two surfaces of a structural plane, a thin film coil component can be formed, as shown in FIG. A schematic diagram of an element embodiment.

The figure shows a cross-sectional view of an embodiment of the inventive film coil component, which may be a rectangular spiral structure or a circular spiral structure as described above. The cross-sectional view shows that the main structure is to form thin film coils (21, 22) as described above on both sides of a structural plane.

This example shows that the central structure is an adhesive layer 30, and one of the embodiments is formed by curing a bonding material mixed with a magnetic material. A spiral structure conforming to the film coil may be formed, and the first film coils 21 (the first surface of the bonding layer 30) and the second film coil 22 are respectively combined on both sides of the bonding layer 30 (the junction is defined as a second surface of the adhesive layer 30, and a first connection port 203 and a second connection port 204 respectively at one end of the film winding of the two film coils (21, 22), at the first film coil 21 The second film coil 22 is connected to the second film coil 22 and electrically connected by an electrical connection. For example, a conductor connection portion 301 is formed through the adhesive layer 30, and the two film coils are electrically connected (21, 22). The inner winding end point is the first winding end point 207 and the second winding end point 208 as shown in FIGS. 2A and 2B. So, equal to the film coil element The two sets of film coils in the piece are connected in series to increase the induced electromotive force and the amount of induced current, so that there can be twice the induced electromagnetic field in the same area, or only half of the area can be achieved under the demand of a certain induced electromagnetic field. .

The function of the adhesive layer 30 is to adhere to the first film coil 21 and the second film coil 22, and is also an insulating layer between the film coils on both sides, and can also charge the front and back of the film coil, and also bear the overall structure of the entire component. Substrate. The spiral structure formed by the film windings on the coils on both sides should be the same, and the current between the first connection port 203 and the second connection port 204 can form an inductive electromagnetic field in a uniform direction, and between adjacent coil structures in the spiral structure The spacing can also be substantially the same, but it does not exclude that there are different spacings according to actual needs.

The process of forming the thin film coil component as schematically shown in the foregoing FIG. 3 can be referred to the flow shown in FIGS. 4A to 4F.

In the process of fabricating the film coil component of the present invention, starting with FIG. 4A, a first conductive film substrate 401 is prepared, which is a substrate in a process formed by a conductive material, such as a copper in this embodiment. The foil substrate may be a pure copper film, a silver conductive paste, a copper conductive paste or the like.

On one surface of the first conductive film substrate 401, as shown in FIG. 4B, an adhesive layer material 403 is applied first, in particular, a material mixed with a magnetic material, so that the adhesive layer formed later is formed. (403') can enhance the electromagnetic induction capability and magnetic field stability of the component. The material of the adhesive layer material 403 has an organic material therein, and the main agent may be an epoxy resin, an acrylic resin, a polyurethane resin, an acrylic resin, a carboxylated nitrile rubber, a nitrile rubber, or the like; The agent, such as an aliphatic, a cyclic aliphatic, an amine, an aromatic hardener, a light hardener, etc.; may be mixed with an inorganic material such as a manganese zinc ferrite, a nickel zinc ferrite magnet or the like. The practical application of the adhesive layer material 403 is also not limited to the materials listed.

After the adhesive layer material 403 is formed on the first conductive film substrate 401, as shown in FIG. 4C, another conductive material may be bonded to the other side of the adhesive layer material 403, such as the first conductive film substrate. 401 material combination (such as pure copper film, Silver conductive paste, copper conductive paste, etc.) to form the second conductive thin film material 402.

Therefore, as shown in the preliminary structure of FIG. 4C, the adhesive layer material 403 becomes the central structure of the entire component, that is, the substrate structure required for the general process is excluded, so that the substrate coil-free film coil component can be manufactured to shorten the process and reduce the cost. The effect of thin and thin components.

Thereafter, as shown in FIG. 4D, after patterning, the first conductive film substrate 401 and the second conductive film material 402 above and below the adhesive layer 403' are formed into a film coil component as shown. One of the ways. According to one of the embodiments, the patterning is performed as a yellow light process, and the above two conductive film materials (401, 402) are exposed by photolithography to form a desired film coil structure.

The present invention does not exclude the use of the adhesive layer material 403 as a substrate in the process, and the first conductive film material 401 and the second conductive film material 402 are disposed on the adhesive layer material 403 by screen printing, bonding or other processes. The surface is then patterned; even the patterned first conductive film material 401 and the second conductive film material 402 are directly disposed on both surfaces of the adhesive layer material 403.

Then, through the patterning process, a first film coil 401' and a second film coil 402' having a spiral structure as shown in FIG. 4D are simultaneously formed, and if necessary, the adhesive layer material 403 can be cured by a curing process ( For example, photocuring, heat curing or photothermal bonding curing, forming an adhesive layer 403', the magnetic material in the adhesive layer 403' has ferromagnetic particles mixed in the adhesive layer material, and can be cured to form a bond. Layer 403' to strengthen the overall structure without a substrate.

The first film coil 401' is formed on one surface of the adhesive layer 403' (which may be defined as a first surface). As shown in FIG. 2A and FIG. 2B, the first film is wound by a first film of a spiral structure. Between the wires, the adjacent structure in the spiral structure of the first film winding has a pitch, and the first connection port of the external connection line is formed on the outer side of the first film winding according to the use, and the inner side has the first winding end point. . The second film coil 402' is formed on the other surface of the adhesive layer (which may be defined as the second surface), and is also composed of a spiral structure second film winding in the same form as the first film coil 401', wherein two The adjacent structure in the spiral structure of the film winding also has a pitch, and the pitch has the same or different distance from the film winding in the first film coil 401'. Similarly, the outer side of the second film winding has an external The second connection port of the connection has a second winding end point on the inner side.

4E is a cross-sectional view showing an electrical connection structure between the first film coil 401' and the second film coil 402' which can form a through-bonding layer 403'. As shown, a conductor connection portion 405 is formed, which can be electrically The electrical connection between the first film coil 401' and the second film coil 402' at the end of the winding is respectively connected. On the outer end points of the first film coil 401' and the second film coil 402', respectively, a first port 407 and a second port 408 as shown in the figure can be formed.

The conductor connecting portion 405 is formed. According to the embodiment, the hole may be penetrated through the adhesive layer 403' to fill the conductive material. The conductor connecting portion 405 may be plated with a pure copper film, an electroless copper film, a silver conductive paste or a copper conductive material. The glue is formed.

Further, according to still another embodiment, the main structure formed by the first thin film coil 401', the adhesive layer 403', and the second thin film coil 402' may be formed on both sides of the spiral structure, that is, close to A first thin film core 409 composed of a conductive material is formed near the center of the first film winding of the first film coil 401'; or a second film may be formed at a central portion of the second film winding of the second film coil 402'. Core 410. The main component of such a thin film magnetic core is a magnetic material, such as a hard magnetic material such as a neodymium iron manganese alloy, a lanthanum manganese alloy, an iron cobalt lanthanum alloy, an iron chrome cobalt alloy thin film magnetic core, etc., and the magnetic material herein may preferably be a ferromagnetic material. Formed to increase the induced current of the film winding and the induced electromotive force or as a coil positioning.

4F shows that the first film core 409 is formed on the near-center surface of the first film coil 401', such as attaching, plating or coating; and the second film core 410 is formed on the surface of the second film coil 402'. Finally, one of the embodiments of a thin film coil component is formed.

Moreover, in this case, a protective layer 400 of a cladding component can be formed on the outside of the thin film coil component, and in addition to being capable of reinforcing the structure, it can be insulated to protect the component, and Anti-corrosion. According to an embodiment, the protective layer 400 may be formed of an organic material, wherein the main agent may be: an epoxy resin, an acrylic resin, a polyurethane resin, an acrylic resin, a carboxylated nitrile rubber, a nitrile rubber, or the like; Agent: aliphatic, cyclic aliphatic, amine, aromatic hardener, light hardener; more preferably inorganic materials such as cerium oxide, aluminum oxide, zirconium oxide, titanium oxide and the like.

For an embodiment of the present invention, a thin film coil having a core structure can be referred to the schematic diagram shown in FIG. 5. This example shows the center of the film winding of the spiral structure in the main structure formed by the first film coil, the adhesive layer and the second film coil. A thin film core is formed on the portion.

This example shows that the film winding 501 forms the film coil 51 in a spiral direction, the outer end of the coil has a connection 埠 503, and the inner side has a winding end point 507. In particular, a thin film core 505 is included in the middle portion of the coil. Preferably, as described in the above embodiment, it may be formed of a ferromagnetic material, which may increase the induced current of the film winding 501 and the induced electromotive force or be used as a coil for positioning; if combined to form a thin film coil component, the first thin film coil may be separately added. The induced electromagnetic field with the second thin film coil induces an electromotive force and reduces eddy current loss.

Figure 6 is a cross-sectional view showing an embodiment of the inventive film coil component.

The figure shows that the adhesive layer 60 is a central structure, and the film coils 51, 51' having a uniform form are formed on both sides, and the film cores 505, 505' are formed at the center portions of the film coils 51, 51' on both sides, and the film on both sides is formed. The coils 51, 51' are externally formed with ports 503, 503'.

Therefore, after the two sets of film coils 51, 51' having the thin film cores 505, 505' are assembled, the winding end points 507, 507' are electrically connected by the conductor connecting portion 601 penetrating the bonding layer 60, so that the two sets of film windings are mutually connected. Connected in series.

After combining one or more thin film coil elements and associated circuits, an embodiment of the present inventive charging device as shown in FIG. 7 can be formed.

The illustration shows a charging device that utilizes a carrier in combination with one or more, or a plurality of laminated film coil components, such as a charging device housing. The invention comprises a plurality of thin film coil elements 701 arranged in an array. The plurality of thin film coil elements 701 are combined on a substrate 70 and placed in the carrier. Once energized, a uniform induced electric field can be formed on the surface of the charging device, and the device can be mounted. The electronic device 72 having the device-end thin-film coil component 721 performs charging, and the device-end thin film coil component 721 senses an induced electric field generated by the charging device, thereby generating an induced current for charging at the device-end thin film coil component 721, and further to the electronic device. The rechargeable battery in 72 is charged to achieve the purpose of wireless charging.

The main circuit of the charging device is a power management unit 703, such as the power management unit 703. The power management unit 703 is electrically connected to the thin film coil component 701, and can be connected to an external power source 705 for managing the operation and input charging of each of the thin film coil components 701 in the charging device. Voltage, component power configuration, etc. The film coil element 701 is as shown in each of the above embodiments, and the respective elements include an adhesive layer mixed with a magnetic material, a first film coil, and a second film coil, and the adhesive layer is particularly formed into a central structure of the element and penetrates through The conductor connecting portion of the adhesive layer is electrically connected to the thin film coils on both sides, and can form an inductive electromagnetic field in a uniform direction on the charging device after being energized.

It is worth mentioning that, in addition to the embodiments described in the above disclosure, the film coils formed on both sides of the adhesive layer are not excluded from sputtering, evaporation, electroplating, electroless plating, coating, and concave. / Letterpress printing, screen printing, yellow light process (exposure lithography), film, transfer, etc.

Therefore, the thin film coil component and the charging device disclosed in the present invention form a high-gain stereo film coil which can be used for wireless charging due to the thinning, flexible and three-dimensional design. According to the embodiment disclosed in the disclosure, the substrate is not provided. The main body of the film coil component is mainly composed of a bonding layer as a central structure, and a film conductive material is used as a substrate in the process, and finally a spiral film coil is formed, and at the same time, the bonding layer material may be mixed with a magnetic material such as ferromagnetic particles. In order to increase the electromagnetic induction capability and the magnetic field stability of the entire component, the thin film coil component can improve the electromagnetic conversion efficiency therein, and more efficiently generate an induced electromotive force or an induced current.

Moreover, the coil element formed by the film coil proposed by the present invention can produce, for example, The traditional copper wire coil produces the effect of inductive electromagnetic field, and because the resistance of the conventional copper wire coil design is smaller, the structure is lighter and thinner than the traditional copper wire coil or the flexible coil on the market, which can effectively improve the power generation efficiency per unit area and can be overcome. The disadvantage of insufficient gain of the film coil.

The above descriptions are only preferred embodiments of the present invention, and all changes and modifications made in accordance with the scope of the patent application of this creation should be covered by this creation.

21‧‧‧First film coil

22‧‧‧Second film coil

203‧‧‧First port

204‧‧‧Second connection

207‧‧‧First winding end point

208‧‧‧second winding end point

301‧‧‧Conductor connection

30‧‧‧ adhesive layer

Claims (10)

A film coil component comprising: an adhesive layer mixed with a magnetic material; a first film coil formed on the first surface of the adhesive layer, consisting of a first film winding of a spiral structure, wherein The adjacent structure of the first film winding has a spacing, the outer side of the first film winding has a first connecting port of the outer connecting line, the inner side has a first winding end point; and the second film coil Formed on the second surface of the adhesive layer, consisting of a second film winding of a spiral structure, wherein adjacent structures in the spiral structure of the second film winding have the same or different spacing a second connection port on the outer side of the second film winding, a second connection port on the inner side, and a second wire end point on the inner side; and a conductor connection portion extending through the adhesive layer to electrically connect the first film The first winding end point of the coil and the second winding end point of the second film coil; wherein the first film coil and the second film coil are bonded to both surfaces of the bonding layer, and the first Spiral of film winding The same as the spiral winding direction of the second film, forming a thin film coil of the induction field to the element via a current connection between the first port and the second port. The thin film coil component of claim 1, wherein the magnetic material in the adhesive layer is ferromagnetic particles mixed in a material of the adhesive layer, which is cured to form the adhesive layer. The thin film coil component of claim 1, wherein the first film winding of the spiral structure and the central portion of the second film winding are respectively formed with a thin film core. The thin film coil component of claim 1, wherein the first thin film coil or the second thin film coil is formed of a pure copper film, a silver conductive paste or a copper conductive paste. The film coil component of claim 1, wherein the conductor connection portion is formed by electroplating a pure copper film, an electroless copper film, a silver conductive paste or a copper conductive paste. The film coil component of any one of claims 1 to 5, wherein the film coil component is covered with a protective layer of insulation. A charging device for charging an electronic device having a device-end thin film coil, comprising: one or more thin film coil components, wherein each thin film coil component comprises: an adhesive layer mixed with a magnetic material; and a first thin film coil Formed on the first surface of the adhesive layer, consisting of a first film winding of a spiral structure, wherein adjacent structures in the spiral structure of the first film winding have a pitch, and the first film winding The outer side has a first connecting port of the outer connecting line, and the inner side has a first winding end point; a second film coil is formed on the second surface of the adhesive layer, and is wound by a second film of a spiral structure The first structure of the spiral structure of the second film winding has a distance equal to or different from the pitch, and the outer side of the second film winding has a second connection port of the external connection, and the inner side has a a second winding end point; a conductor connecting portion extending through the bonding layer to electrically connect the first winding end point of the first film coil and the second winding end point of the second film coil; and a power source tube The unit is electrically connected to the one or more thin film coil components; wherein the first thin film coil and the second thin film coil are coupled to two surfaces of the adhesive layer, and the spiral direction of the first thin film winding The second film winding has the same spiral direction; after energization, an inductive electromagnetic field in a uniform direction is formed on the charging device. The charging device according to claim 7, wherein in the charging device formed by the plurality of thin film coil elements, when the charging device comprises a plurality of thin film coil elements, the plurality of thin film coil elements are combined in a carrier in an array form . The charging device of claim 7, wherein a film core is formed in each of the first film winding and the second film winding center portion of the spiral structure. A charging device according to any one of claims 7 to 9, wherein the charging device is The individual one or more of the film coil elements are covered with an insulating protective layer.