CN204361741U - Thin film coil element and related charging device - Google Patents

Abstract

A thin film coil element and a related charging device, wherein the thin film coil element structure uses an adhesive layer to form the central structure of the element. During the manufacturing process, a conductive film material is used as a substrate, and the adhesive layer is formed on this substrate. A thin film coil structure is formed on two surfaces of the adhesive layer through a patterning process. A conductor connection portion is formed that passes through the adhesive layer. The conductor connection structure electrically connects the thin film coil structure on the two surfaces of the adhesive layer, thereby forming a thin film coil element. Thereafter, multiple thin film coil elements can be combined to produce a charging device that uses coil electromagnetic induction technology.

Description

Thin film coil element and related charging device

technical field

The utility model relates to a coil element and a related charging device, in particular to a thin film coil element formed with a thin film conductor coil structure, and a charging device formed by combining a plurality of thin film coil elements.

Background technique

Wireless charging, also known as inductive charging or non-contact inductive charging, uses near-field induction, that is, inductive coupling, to transmit energy from power supply equipment to electrical devices. The general technology is to set a magnetic core in the charger, and then wind a copper coil outside. After electrification, an electromagnetic field in a certain direction can be generated. If an alternating current is applied, an alternating electromagnetic field can be generated. If there is another coil in the electrical device to receive The AC electromagnetic field can be converted into electrical energy to supply power to the electrical device or to charge the rechargeable battery inside it. Since the energy is transmitted by inductive coupling between the charger and the electric device, there is no need for wire connection.

The traditional coil design is shown in Fig. 1A and Fig. 1B. FIG. 1A shows the coil of a general wireless charging module, with three turns, and an induced electromagnetic field strength can be generated after one end is energized. In order to increase the intensity of the induced electromagnetic field, as shown in FIG. 1B , the number of winding turns of the planar coil can be increased to six turns, and theoretically the intensity of the induced electromagnetic field can be doubled. However, this will increase the wire length by more than two times, which will affect the overall resistance value of the coil and reduce the efficiency of wireless charging.

At the same time, wireless charging still has some shortcomings to be overcome, such as slightly lower efficiency. Generally, there is a transformer in the charger, but wireless charging is composed of the first coil and the second coil. Due to structural limitations, the energy transmission efficiency will be slightly lower. In general chargers, plus the power supply is first stepped down, rectified and stabilized by the external circuit before being sent to the wireless charging module, the conversion efficiency will also be limited by the design of the external circuit; The wire resistance is increased and the heat is serious. It has the same problem as the traditional charger. Even when charging, it will generate heat.

Utility model content

This specification discloses a thin film coil element and related charging device, wherein the structure of the thin film coil element uses an adhesive layer to form the central structure of the element, and a conductive thin film material is used as the base material in the manufacturing process, and the adhesive layer is formed on the base material Above, the thin film coil structure formed on the two surfaces of the adhesive layer through the patterning process, and the conductor connection part penetrating through the adhesive layer is formed, and the conductor connection structure is the thin film coil structure electrically connected on the two surfaces of the adhesive layer, Thus, the thin film coil element is formed, and then a plurality of thin film coil elements can be combined to manufacture a charging device using coil electromagnetic induction technology.

According to one embodiment, the thin-film coil element includes an adhesive layer forming a central structure, wherein the material may be mixed with magnetic material, and the element includes a first thin-film coil formed on a first surface of the adhesive layer, formed by a helical structure. Composed of the first film winding, the outer side of the first film winding has the first connection port for the external connection, and the inner side has the first winding end point; there is also a second film coil formed on the second surface of the adhesive layer On the top, it is composed of the second film winding in a helical structure, the outside of the second film winding has a second connection port for external connection, and the inside has a second winding terminal.

The first thin-film coil and the second thin-film coil can be electrically connected to each other by a conductor connecting portion, which penetrates through the adhesive layer and connects 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 thin film coil on both sides of the adhesive layer can form an induced electromagnetic field in the thin film coil element, and the adhesive layer mixed with magnetic material can increase Induced current and induced electromotive force in thin film winding.

In an embodiment, the central parts of the first thin film winding and the second thin film winding of the helical structure formed on both sides of the substrate may also be respectively formed with a thin film magnetic core.

According to the embodiment contained in the description, the above one or more thin film coil elements are combined to form a charging device, which can be used to charge an electronic device with a corresponding coil. The charging device includes one or more thin film coil elements, wherein each thin film coil element is mainly The element has an adhesive layer mixed with magnetic material, and a first thin film coil and a second thin film coil formed on both sides of the adhesive layer, and a conductor connecting portion penetrates the adhesive layer to electrically connect the first thin film coil and the second thin film coil. Two thin-film coils. The charging device further includes a power management unit capable of managing and controlling the induced power generated by one or more thin film coil elements in the charging device.

In order to further understand the technology, method and effect that the utility model adopts to achieve the established purpose, please refer to the following detailed description and accompanying drawings of the utility model, and believe that the purpose, characteristics and characteristics of the utility model can be obtained from this In-depth and specific understanding, however, the accompanying drawings and appendices are only for reference and description, and are not used to limit the utility model.

Description of drawings

1A and 1B schematically show the form of a general copper coil;

Fig. 2A, 2B show the schematic diagram of the embodiment of thin film coil in the element of the present invention;

Fig. 3 shows the schematic diagram of the embodiment of the thin film coil element of the present invention;

Fig. 4A to Fig. 4F show the embodiment process of making the thin film coil element of the present utility model;

Fig. 5 shows the schematic diagram of the embodiment of the thin film coil with magnetic core structure of the present invention;

Figure 6 shows a schematic cross-sectional view of an embodiment of the thin film coil element of the present invention;

Fig. 7 is a schematic diagram of an embodiment of the charging device of the present invention.

【Symbol Description】

First film coil 21 Second film coil 22

First film winding 201 Second film winding 202

The first connection port 203 The second connection port 204

The first winding end point 207 The second winding end point 208

Conductor connection part 301 Adhesive layer 30

The first conductive film substrate 401 The first film coil 401'

Adhesive layer material 403 Adhesive layer 403'

The second conductive film material 402 The second film coil 402'

Conductor connection part 405 First connection port 407

The second connection port 408 The first thin-film magnetic core 409

The second thin film magnetic core 410 protective layer 400

Thin film coil 51, 51' film winding 501

Connection ports 503, 503' Thin film cores 505, 505'

Winding end point 507,507'

Adhesive layer 60 Conductor connecting part 601

Substrate 70 Thin film coil element 701

Power Management Unit 703 Power Supply 705

Electronic device 72 Thin film coil element at the device end 721

Detailed ways

The utility model proposes a thin-film coil element, which is a thin and conductive thin-film device made through thin-film technology. The utility model also relates to a charging device combined with the thin-film coil, especially a charging device with a specific line width. The thin-film coil that can generate an induced electromagnetic field by being energized can be applied to the high-gain thin-film coil design of wireless charging, and a charging device is formed by combining multiple thin-film coils.

It is worth mentioning that the thin-film coil element proposed by the utility model adopts an adhesive layer in the element to become the central structure of the thin-film coil element, that is, it reduces the base material structure that usually uses plastic or specific materials. A conductive film material can be used as a substrate, such as a metal foil, and then an adhesive material is coated on the substrate, and another conductive film material is bonded to the other surface of the adhesive material, and then patterned The thin film coil structures are 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 to form a thin film coil element.

One of the effects of using thin-film design in the embodiment of the thin-film coil element disclosed in the specification is that even if the number of turns is increased, the overall resistance of the coil will not be significantly increased, and the charging efficiency can be effectively improved, such as increasing the charging efficiency from 70% to 80%. above, and it is not easy to have the problem of heating. In addition, one embodiment of the thin film coil can make the coil thinner and three-dimensional, which can help the flexibility and miniaturization of the whole wireless charging device, for example, the thinness can be less than 0.5 mm.

Fig. 2A shows one of the embodiment schematic diagrams of the thin film coil in the element of the present invention, the thin film coil of this example is the first thin film coil 21 with a helical direction, is made up of the first thin film winding wire 201 of spiral structure, forms multiple Thin film coil with turns. The thin film winding is preferably a thin film made of conductive material, and the adjacent structures in the helical structure have a distance, so that the electrical signals will not be coupled or affected by each other. The outside of the first film winding 201 has a connection port for external (external circuit) connection, such as the first connection port 203 shown in the figure, while the inside has a winding end point, such as the first winding end point shown in the figure 207.

In contrast, FIG. 2B then schematically shows that there is a second thin film coil 22 with the opposite helical mode, which is composed of a second thin film winding 202 in a helical structure, and there is also a distance between adjacent structures, which is the same as that of the first thin film coil described above. The structural pitches of 21 may be substantially uniform, but may not be uniform. Similarly, the second film winding 202 has a second connection port 204 for external connection on the outside, and a second winding end point 208 on the inside.

In the above-mentioned thin film coils (the first thin film coil 21, the second thin film coil 22), through the supply of power, the current passes through the external connection ports (the first connection port 203, the second connection port 204) of each coil to the winding end point (the second connection port 204). The first winding end point 207 and the second winding end point 208 ) can form an induced electromagnetic field.

In terms of design, under the actual needs of the first thin film coil 21 and the second thin film coil 22, the spacing between adjacent windings in the helical structure can be the same or different, and can also include the same number of turns or different numbers of turns, and even the coil area It can also be different.

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

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

The figure shows a cross-sectional view of an embodiment of the thin film coil element of the present invention, and the actual forward pattern can be as the aforementioned rectangular spiral structure or circular spiral structure. The sectional view shows that the main structure is that the aforementioned thin film coils (21, 22) are respectively formed on both sides of a structural plane.

This example shows that the central structure is an adhesive layer 30 , which is formed by curing an adhesive material mixed with magnetic materials in one embodiment. A spiral structure consistent with the film coil can be formed, and the surfaces on both sides of the adhesive layer 30 are respectively combined with the first film coil 21 (the joint surface is defined as the first surface of the adhesive layer 30) and the second film coil 22 (the joint surface is defined as the first surface of the adhesive layer 30 ). The second surface of the adhesive layer 30), and the first connection port 203 and the second connection port 204 at one end of the film windings of the two film coils (21, 22) appear below, respectively, in the first film coil 21 and the second thin film coil 22 through the adhesive layer 30 to be electrically connected by an electrical connection means, such as forming a conductor connection portion 301 through the adhesive layer 30, electrically connecting the two thin film coils (21, 22) The internal winding end points are the first winding end point 207 and the second winding end point 208 shown in FIGS. 2A and 2B . In this way, it is equivalent to connecting two sets of thin film coils in the thin film coil element in series, which can increase the amount of induced electromotive force and induced current, so it can have twice the induced electromagnetic field in the same area, or only half of the required induced electromagnetic field. area can be achieved.

The function of the adhesive layer 30 is not only to bond the first thin film coil 21 and the second thin film coil 22, but also to be an insulating layer between the thin film coils on both sides. base material. The helical structures formed by the thin film windings on the coils on both sides should be the same, and the electric current between the first connection port 203 and the second connection port 204 can form an induced electromagnetic field in the same direction, and the adjacent coil structures in the helical structure The intervals can also be substantially the same, but it does not rule out having different intervals according to actual needs.

The process of forming the thin film coil element as schematically shown in FIG. 3 may refer to the flow shown in FIG. 4A to FIG. 4F .

In the process of making the embodiment of the thin film coil element of the present invention, as shown in Figure 4A, a first conductive thin film substrate 401 is prepared first, which is a substrate in the process of forming a conductive material, such as this embodiment It is a kind of copper foil substrate, and others can be pure copper film, silver conductive adhesive, copper conductive adhesive, etc.

On one surface of the first conductive film substrate 401, as shown in FIG. 4B, an adhesive layer material 403 is coated in advance, especially a material mixed with a magnetic material to form, so that the bonding formed later The layer (403') can enhance the electromagnetic induction capability and magnetic field stability of the element. In the material embodiment of the bonding layer material 403, there is an organic material, and the main agent can be epoxy resin, acrylic resin, polyurethane resin, acrylic resin, carboxylated nitrile rubber, nitrile rubber, etc.; Agents, such as aliphatic, cycloaliphatic, amines, aromatic hardeners, light hardeners, etc.; can be mixed with inorganic materials such as manganese zinc ferrite, nickel zinc ferrite magnets, etc. The practical application of the adhesive layer material 403 is not limited to the enumerated materials.

After the adhesive layer material 403 is formed on the first conductive film substrate 401, as shown in FIG. 401 (such as pure copper film, silver conductive glue, copper conductive glue, etc.) to form the second conductive film material 402 .

Thus, as shown in the preliminary structure of Figure 4C, the adhesive layer material 403 becomes the central structure of the entire element, that is, the substrate structure required by the general manufacturing process is eliminated. The effect of cost, component thinning and miniaturization.

After that, 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' form the implementation of the thin film coil element as shown in the figure. one of the ways. According to one embodiment, the above two conductive thin film materials ( 401 , 402 ) are patterned, such as photolithography, to form the desired thin film coil structure.

The utility model does not exclude the use of the adhesive layer material 403 as the substrate in the process, and the first conductive film material 401 and the second conductive film material 402 are arranged on the adhesive layer material by screen printing, bonding or other process methods. 403 on both surfaces and then patterning; even the patterned first conductive film material 401 and the second conductive film material 402 are directly disposed on the two surfaces of the adhesive layer material 403 .

Thus, through the patterning process, the first thin film coil 401' and the second thin film coil 402' having a spiral structure as shown in FIG. 4D are simultaneously formed. If necessary, the adhesive layer material 403 can be completed through a curing process. Curing (such as light curing, thermal curing or photothermal bonding type curing) to form an adhesive layer 403', including the magnetic material in the adhesive layer 403' having ferromagnetic particles mixed in the adhesive layer material, which can be cured An adhesive layer 403' is formed to strengthen the overall substrate-less structure.

Wherein, the first thin film coil 401' is formed on one surface of the adhesive layer 403' (which can be designated as the first surface). Composition, the adjacent structures in the helical structure of the first film winding have a distance, and according to the application, the first connection port for the external connection is formed on the outside of the first film winding, and the first winding end point is formed on the inside. The second thin film coil 402' is formed on the other surface of the adhesive layer (can be designated as the second surface), and is also composed of a second thin film coil with a helical structure in the same form as the first thin film coil 401', wherein the second thin film coil Adjacent structures in the helical structure of the two thin-film windings also have a pitch, and this pitch has the same or different distance from the pitch of the thin-film windings in the first thin-film coil 401'. Similarly, the outer side of the second thin-film winding has The second connection port for the external connection has a second winding end point inside.

FIG. 4E then shows in a cross-sectional view that an electrical connection structure through the adhesive layer 403' can be formed between the first thin film coil 401' and the second thin film coil 402'. As shown in the figure, a conductor connection part 405 is formed, which can be electrically connected. Connect the electrical contacts formed at the winding end points of the first thin film coil 401 ′ and the second thin film coil 402 ′ respectively. On the external terminals of the first thin film coil 401' and the second thin film coil 402' respectively, a first connection port 407 and a second connection port 408 as shown in the figure can be formed.

The way of forming the conductor connection part 405, according to the embodiment, can first penetrate the hole on the adhesive layer 403' to fill in the conductive material. The conductor connection part 405 can be electroplated pure copper film, electroless plated pure copper film, silver conductive glue or Copper conductive glue is formed.

Furthermore, according to yet another embodiment, the above-mentioned main structure formed by the first thin film coil 401', the adhesive layer 403' and the second thin film coil 402' can be formed on both sides of the spiral structure, that is, close to A first thin film magnetic core 409 made of conductive material is formed near the center of the first thin film winding of the first thin film coil 401'; thin film magnetic core 410 . The main component of this type of thin-film magnetic core is magnetic material, such as hard magnetic materials such as niobium-iron-manganese alloy, thorium-manganese alloy, iron-cobalt-silicon alloy, iron-chromium-cobalt alloy thin-film magnetic core, etc. The magnetic material here can preferably be a strong Formed by magnetic materials, it can increase the induced current and induced electromotive force of the film winding or be used for coil positioning.

FIG. 4F shows that the first thin film magnetic core 409 is formed on the surface near the center of the first thin film coil 401' by a process such as attachment, electroplating or coating; the second thin film magnetic core 410 is formed on the surface of the second thin film coil 402' superior. Finally one embodiment of a thin film coil element is formed.

Moreover, in this example, a protective layer 400 covering the element can be formed outside the thin film coil element. In addition to strengthening the structure, it can also insulate to protect the element and prevent corrosion. According to an embodiment, the protective layer 400 can be formed of organic materials, wherein the main agent can be: epoxy resin, acrylic resin, polyurethane resin, acrylic resin, carboxylated nitrile rubber, nitrile rubber, etc.; Agents: aliphatic, cycloaliphatic, amines, aromatic hardeners, light hardeners; it can also include inorganic materials such as silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, etc.

The embodiment of the thin film coil with magnetic core structure of the present invention can refer to the schematic diagram shown in Fig. 5. A thin-film magnetic core is formed at the central portion of the wire.

This example shows that the thin film winding 501 forms a thin film coil 51 in a certain helical direction. The outer end of the coil has a connection port 503, and the inner end has a winding end 507. In particular, a thin film magnetic core 505 is included in the middle of the coil. The substance can preferably be formed of a ferromagnetic material as described in the above embodiments, which can increase the induced current and induced electromotive force of the thin film winding 501 or be used as a coil positioning; if combined to form a thin film coil element, the first The induced electromagnetic field and the induced electromotive force of the thin film coil and the second thin film coil reduce eddy current loss.

FIG. 6 shows a schematic cross-sectional view of an embodiment of the thin film coil element of the present invention.

This figure shows that the adhesive layer 60 is a central structure, and thin-film coils 51, 51' with the same form are respectively formed on both sides, and thin-film magnetic cores 505, 505' are respectively formed in the central parts of the thin-film coils 51, 51' on both sides. The thin film coils 51, 51' are externally formed with connection ports 503, 503'.

Therefore, after two sets of thin film coils 51, 51' with thin film magnetic cores 505, 505' are assembled, the winding end points 507, 507' are electrically connected with the conductor connection part 601 penetrating through the adhesive layer 60, so that the two sets of thin film coils are wound The lines are connected in series.

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

The illustration shows a charging device, the charging device uses a carrier to combine one or more, or a plurality of laminated thin film coil elements, the carrier is like a charging device housing, including a plurality of thin film coil elements 701 arranged in an array, multiple A thin film coil element 701 is combined on a substrate 70 and placed in a carrier. Once energized, a uniform induced electric field can be formed on the surface of the charging device, and the electronic device 72 equipped with the device end thin film coil element 721 can be charged. The thin-film coil element 721 at the device end induces the electric field generated by the charging device, so the thin-film coil element 721 at the device end generates an induced current for charging, and then charges the rechargeable battery in the electronic device 72 to achieve the purpose of wireless charging.

The main circuit in the charging device is such as the power management unit 703 shown in the figure. The power management unit 703 is electrically connected to the thin film coil element 701 and can be connected to an external power supply 705 to manage the operation and input charging voltage of each thin film coil element 701 in the charging device. , Component power configuration, etc. The thin film coil element 701 is as shown in the above embodiments, each element includes an adhesive layer mixed with magnetic material, a first thin film coil and a second thin film coil, the adhesive layer is specially formed as the central structure of this element, and passes through The conductor connecting portion penetrating through the adhesive layer is electrically connected to the thin film coils on both sides, and can form an induced electromagnetic field in the same direction on the charging device after electrification.

It is worth mentioning that, in addition to the embodiments described in the above specification, the manufacturing method of the thin film coils formed on both sides of the adhesive layer does not exclude that sputtering, evaporation, electroplating, electroless plating, coating, concave/ Toppan printing, screen printing, yellow light process (exposure lithography), film, transfer printing and other methods to achieve.

Therefore, the thin-film coil element and the charging device disclosed in the utility model form a high-gain three-dimensional thin-film coil that can be used for wireless charging due to the thin, flexible and three-dimensional design. According to the embodiment contained in the specification, this substrate-free The main body of the thin-film coil component mainly uses the adhesive layer as the central structure directly, and the thin-film conductive material is used as the substrate in the manufacturing process, and finally forms a spiral-shaped thin-film coil. At the same time, the adhesive layer material can be mixed with magnetic materials, such as ferromagnetic particles. , to increase the electromagnetic induction capability and magnetic field stability of the entire element, so that the thin film coil element can improve the electromagnetic conversion efficiency in it, and generate induced electromotive force or induced current more efficiently.

What's more, the coil element formed by the thin film coil proposed by the utility model can produce the effect of the induced electromagnetic field as the traditional copper wire coil, and because the resistance loss of the traditional copper wire coil design is smaller, the structure is better than the traditional copper wire coil or the market. The upper flexible coil is lighter and thinner, which can effectively improve the power generation efficiency per unit area, and can overcome the disadvantage of insufficient gain of the thin film coil.

The above description is only a preferred feasible embodiment of the utility model, and all equal changes and modifications made according to the patent scope of the utility model shall fall within the scope of the utility model.

Claims (10)

1. a film coil element, is characterized in that described element comprises:

One adhesive linkage being mixed with magnetic material;

One the first film coil, be formed on the first surface of this adhesive linkage, be made up of the first film coiling of a helical structure, in the helical structure of wherein this first film coiling, adjacent structure has a spacing, the outside of this first film coiling has one first connectivity port of external connection, and inner side has one first coiling terminal;

One second film coil, be formed on the second surface of this adhesive linkage, be made up of the second film coiling of a helical structure, in the helical structure of wherein this second film coiling, adjacent structure has a distance identical or different with this spacing, the outside of this second film coiling has one second connectivity port of external connection, and inner side has one second coiling terminal; And

One conductor coupling portion, runs through this adhesive linkage, with this second coiling terminal of this first coiling terminal and this second film coil of being electrically connected this first film coil;

Wherein, this the first film coil and this second film coil are incorporated into two surfaces of this adhesive linkage, and the hand of spiral of this first film coiling is identical with the hand of spiral of this second film coiling, in this film coil element, form an induction field through the electric current between this first connectivity port and this second connectivity port.

2. film coil element as claimed in claim 1, the magnetic material wherein in this adhesive linkage is be mixed in the ferromagnetic particle in an adhesive linkage material, through solidifying to form this adhesive linkage.

3. film coil element as claimed in claim 1, wherein this first film coiling of this helical structure and this second film coiling centre are distinctly formed with a thin film magnetic core.

4. film coil element as claimed in claim 1, wherein this first film coil or this second film coil formed with fine copper film, silver conductive adhesive or copper conductive adhesive.

5. film coil element as claimed in claim 1, wherein this conductor coupling portion formed to electroplate fine copper film, electroless plating fine copper film, silver conductive adhesive or copper conductive adhesive.

6., as the film coil element of claim 1 to 5 as described in one of them, wherein this film coil element is coated with a protective layer of insulation.

7. a charging device, in order to a charge electronic devices with device end film coil, is characterized in that described device comprises:

One or more film coil element, wherein each film coil element comprises:

One adhesive linkage being mixed with magnetic material;

One the first film coil, be formed at the first surface of this adhesive linkage, be made up of the first film coiling of a helical structure, in the helical structure of wherein this first film coiling, adjacent structure has a spacing, the outside of this first film coiling has one first connectivity port of external connection, and inner side has one first coiling terminal;

One second film coil, be formed at the second surface of this adhesive linkage, be made up of the second film coiling of a helical structure, in the helical structure of wherein this second film coiling, adjacent structure has a distance identical or different with this spacing, the outside of this second film coiling has one second connectivity port of external connection, and inner side has one second coiling terminal;

One conductor coupling portion, runs through this adhesive linkage, with this second coiling terminal of this first coiling terminal and this second film coil of being electrically connected this first film coil; And

One Power Management Unit, is electrically connected this one or more film coil element;

Wherein, this first film coil and this second film coil are incorporated into two surfaces of this adhesive linkage, and the hand of spiral of this first film coiling is identical with the hand of spiral of this second film coiling; On this charging device, the induction field in consistent direction is formed after energising.

8. charging device as claimed in claim 7, in the charging device wherein formed with the plurality of film coil element, when this charging device comprises multiple film coil element, the plurality of film coil element is combined in a carrier in the form of an array.

9. charging device as claimed in claim 7, wherein this first film coiling of this helical structure and this second film coiling centre are distinctly formed with a thin film magnetic core.

10., as the charging device of claim 7 to 9 as described in one of them, indivedual protective layers with insulation of this one or more film coil element wherein in this charging device are coated.