TWM492513U - Thin-film coil, thin-film coil element and charging apparatus - Google Patents

Abstract

Disclosure is related to a thin-film coil, a thin-film coil element, and a charging apparatus. The thin-film coil is composed of spirally-structural thin-film winding. Within the spirally-structural windings, the adjacent structure exists a spacing there-between. The thin-film winding has a connection port to an external circuit, and a winding terminal at the inner side. An induced electric field can be formed as supplying electric current from the connection port to the inner terminal. Further, a thin-film coil element is made when two thin-film coils with the same spiral direction are fabricated on two opposite surfaces of a substrate. An induced electric field is also created when powering this thin-film coil element. Assembly of one or more thin-film coil element can be made as a charging apparatus used to electrically charge an electronic device which includes device-end thin-film coil element.

Description

Film coil, film coil component and charging device

The present invention is a film coil, a film coil component and a charging device, in particular, a film coil having a specific line width and capable of generating an induced electromagnetic field by energization, a film coil component, and a charging device formed by combining a plurality of film coil components.

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.

In order to propose a problem that can effectively improve the charging efficiency and improve the heat generation, the present invention proposes a film coil, a film coil component, and a charging device using the film coil combination, which can be applied to a wireless charging high gain film coil design. One of the effects is that even if the number of turns is increased, the resistance value of the entire coil is not significantly increased, which can effectively improve the charging efficiency and is less prone to heat generation.

According to an embodiment, the disclosure describes a thin film coil consisting of a spiral wound film, the film winding being a conductor, the adjacent structure of the spiral structure having a pitch, and the outer side of the film winding having an external connection One of the ports is connected to the inside, and the inner side has a winding end point, and an inductive electromagnetic field can be formed by energizing the connection and the winding end point.

In one embodiment, a thin film core may be formed at a central portion of the spiral winding of the film structure.

By combining two film coils, a film coil component can be formed. Embodiments include a substrate, and first film coils and second film coils forming both side surfaces of the substrate. The first film coil is formed on the first surface of the substrate, and is composed of a first film winding of a spiral structure. The first film winding has a first connection port on the outer side of the wire and a first wire end on the inner side. . The second film coil is formed on the second surface of the substrate, and is composed of a second film winding of a spiral structure. The second film winding has a second connecting port on the outer side of the wire and a second winding on the inner side. end.

The first film coil and the second film coil may be electrically connected by an electrical connection means, and the spiral direction of the first film winding is opposite to the spiral direction of the second film winding Similarly, an electric current between the first connection port and the second connection port forms an induced electromagnetic field.

Similarly, a thin film core may be formed separately between the first film winding of the spiral structure and the center of the second film winding. Alternatively, the first film coil and the second film coil may be separately formed on a magnetic film and then bonded to both surfaces of the substrate. In one embodiment, the substrate is a magnetic substrate.

In combination with one or more of the film coil elements, a charging device can be formed for charging the consumer having the device-end film coil component.

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‧‧‧ coil connection

30‧‧‧Substrate

40‧‧‧Substrate

41‧‧‧First film coil

42‧‧‧Second film coil

403‧‧‧First port

404‧‧‧Second port

51, 51'‧‧‧ film coil

501‧‧‧film winding

503, 503’‧‧‧ Connections

505, 505'‧‧‧ film core

507‧‧‧ winding end point

60‧‧‧Substrate

601‧‧‧ coil connection

70, 70'‧‧‧ magnetic film

71, 71'‧‧‧ film coil

701‧‧‧ film winding

703‧‧‧Connector

80‧‧‧Substrate

90‧‧‧Magnetic substrate

10‧‧‧Charging device

101‧‧‧film coil components

103‧‧‧Power Management Unit

104‧‧‧Power supply

105‧‧‧Electrical devices

107‧‧‧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 the inventive film coil; FIGS. 3A and 3B show a schematic view of an embodiment of the inventive film coil component, and FIG. 4 shows the inventive film coil component. FIG. 5 is a schematic view showing another embodiment of the inventive film coil component; FIG. 7 is a schematic view showing another embodiment of the film coil component of the present invention; 8 is a schematic view showing an embodiment of the present invention; FIG. 9 is a schematic view showing another embodiment of the present invention; FIG. 10 is a schematic diagram showing an embodiment of the present invention; FIG. Figure 12 shows the waveform of the inductive signal at the receiving end; Figure 13 shows the inductive signal waveform of the receiving end of the double-sided film coil.

The present invention proposes a thin film coil and a thin film coil component, which is a thin and electrically conductive thin film device through a thin film technology. The present invention also relates to a charging device using the combination of the thin film coil, in particular, a specific line width and a power supply. A thin film coil capable of generating an induced electromagnetic field can be applied to a wirelessly charged high gain thin film coil design, and a plurality of thin film coils are combined to form a charging device.

One of the effects of the film design is that even if the number of turns is increased, the resistance value of the entire coil is not significantly improved, and the charging efficiency can be effectively improved, for example, the charging efficiency is increased from 70% to 80% or more, and the problem of heat generation is not easy. 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 the film coil of 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 multi-turn film. Coil. 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.

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 substrate, a thin film coil component can be formed, as shown in FIG. 3A. A schematic of an embodiment.

The figure shows a cross-sectional view of a thin film coil component in which a substrate 30 has a first film coil 21 and a second film coil 22 joined to each other, and a film winding of the two film coils (21, 22) is shown below. The first connection port 203 and the second connection port 204 of the wire are electrically connected between the first film coil 21 and the second film coil 22 by an electrical connection means, such as a coil connection portion 301 penetrating the substrate 30. The winding end points of the two film coils (21, 22) are connected, as shown in Figs. 2A, 2B, the first winding end point 207 and the second winding end point 208. In this way, the two sets of film coils in the thin film coil component 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 required electromagnetic field. The area can be reached.

The first film coil 21 and the second film coil 22 are combined on both sides of the substrate 30, and the spiral structure formed by the film winding on the coil should be the same, and the current between the first connection port 203 and the second connection port 204 can be formed. The induced electromagnetic field in a uniform direction, and the spacing between adjacent coil structures in the spiral structure may also be substantially the same, but it is not excluded that there are different spacings according to actual needs.

FIG. 3B is a perspective view showing the coil element of the present invention. It is apparent from the figure that the first film coil 21 and the second film coil 22 are respectively combined on both sides of the substrate 30, wherein the second film coil 22 is located in this figure. The lower side of the substrate 30, This part is indicated by a dotted line.

In this example, the first film coil 21 has a first connection port 203 wired to the external circuit, and a second connection port 204 of the second film coil 22, the positions of which are formed on the substrate 30 at a wrong distance. The first winding end point 207 and the second winding end point 208 are respectively inside the film coils (21, 22), and as shown in FIG. 3A, the coil connecting portion 301 is electrically connected to the first winding end point 207 and the second winding end point. 208. In other embodiments, the first winding end point 207 and the second winding end point 208 are respectively connected to other external circuits by electrical connection lines.

4 is a schematic view showing an embodiment of another thin film coil component. The example shows that the two sides of the substrate 40 are respectively combined with the first thin film coil 41 and the second thin film coil 42, and the tail ends of the two thin film coils are respectively the first connection. The 埠 403 and the second port 404, in this example, show that the positions of the first port 403 and the second port 404 overlap with each other via the substrate 40. The first connecting port 403 and the second connecting port 404 on both sides of the high-gain stereo film coil shown in this example are disposed at the overlapping positions of the substrate 40, so that the area of the wiring can be reduced to facilitate the miniaturization of the related device.

Furthermore, in another embodiment, a thin film core is formed at the center of the winding of the film of the spiral structure in the film coil, and a schematic diagram as shown in FIG. 5 is implemented.

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, it can be formed by a ferromagnetic material, which can increase the induced current and the induced electromotive force of the film winding 501; if combined to form the thin film coil component, the induced electromagnetic field and the induced electromotive force of the first thin film coil and the second thin film coil can be respectively increased. And reduce eddy current losses.

After assembling two sets of film coils (51) having a thin film core (Fig. 5, 505), a schematic view of the embodiment shown in Fig. 6 is shown. The cross-sectional view shows that the film coils 51, 51' are formed on both sides of the substrate 60 in the same winding structure direction, and the winding end points of the film coils 51, 51' are the external connection ports 503, 503'. The center positions of the coils respectively have thin film cores 505, 505', and similarly, coil connection portions 601 are utilized. The wiring ends of the film coils 51, 51' are electrically connected to each other in series.

In another embodiment, the film coil can be formed on the magnetic film 70 as shown in the embodiment of FIG. 7. The magnetic film 70 can be formed of a ferrite material, which can effectively increase the inductance of the film coil 71 formed by the film winding 701. Current and induced electromotive force, and reduce eddy current loss.

The film coil 71 of this example can also be composed of a spiral film winding 701, which is a conductor, and the structure shows that the adjacent structures in the spiral structure have a pitch, in particular, the film in the film coil 71. Each of the ends of the winding 701 is formed with a connection circuit to form an external connection port 703. The current flowing through the two end points in the connection port 703 will also form an induced electromagnetic field.

FIG. 8 is a schematic view showing an embodiment of the film coil component of the present invention. The film coil component of the example is also provided with a substrate 80, and the two surfaces of the substrate 80 are respectively combined with the magnetic film 70 as shown in FIG. The film coils 71, 71' on the 70', that is, the film coils 71, 71' on both sides are formed on the magnetic films 70, 70', respectively, and bonded to the substrate 80 via the magnetic films 70, 70'.

9 is a schematic view showing still another embodiment of the film coil component of the present invention. The figure shows that the film coils 71, 71' are not formed on the magnetic film first, but a magnetic substrate 90 is directly disposed on both sides of the magnetic substrate 90. Multiple turns of coils with specific helical directions are combined. The magnetic substrate 90 made of ferrite material can effectively increase the induced current and the induced electromotive force.

In the film coil component shown in the above embodiments, whether it has a thin film core or formed on a magnetic thin film or a magnetic substrate, the magnetic field direction of the magnetic material associated with the first thin film coil and the second thin film coil must be the same. The implementation of these thin and three-dimensional designs can form a high-gain stereo (3D) film coil for wireless charging, which helps to enhance the effect of the induced electromagnetic field and makes the wireless charging module flexible. The thinning can also greatly reduce the thickness of the overall related charging device or module. In terms of materials, the material of the thin film core, the magnetic thin film or the magnetic substrate in the thin film coil component may be a paramagnetic or soft magnetic material.

For an embodiment of the charging device, reference may be made to the schematic diagram shown in FIG.

The charging device 10 uses a carrier to combine one or more (layer) film coil components, such as an electronic device casing, in which a film coil component 101 can be mounted, and after being energized, an induced electromagnetic field is generated, which can be used to mount a device. The electric device 105 of the thin film coil element 107 is charged. The thin film coil component 101 is as shown in each of the above embodiments, and the respective components include a substrate and first and second thin film coils formed on both sides of the substrate, and the two sets of thin film coils may be electrically connected by a specific electrical connection means, at least The method further comprises: electrically connecting the end points of the windings in the film coils by using the coil connecting portions, or electrically connecting the winding end points and the connecting ports of the film coils through an external line.

In another embodiment, the carrier of the charging device 10 may include a plurality of thin film coil elements 101 in the form of an array, as shown, such that a uniform induced electromagnetic field is generated on one of the planes of the charging device 10, which may be placed on the charging device 10. The electric device 105 is charged.

The charging device 10 is provided with a power management unit 103 electrically connected to one or more thin film coil components 101, and a segment of the power supply 104 is connected to manage the power configuration in the device. Through the power management unit 103, the one or more thin film coil elements 101 that are energized can charge the electric device 105 placed on the charging device 10, and the corresponding device end film coil element 107 should be disposed in the electric device 105. The induced electromagnetic field generated by the thin film coil element 101 in the charging device 10 can be sensed, and an induced current for charging is generated at the device-end thin film coil element 107, thereby charging the rechargeable battery in the electric device 105 to achieve wireless charging.

Several embodiments of the film coil proposed in the present application are presented below.

A thin film coil component includes two planar film coils (A side and B side) separated by a substrate. According to the experiment, the inner diameter of the A-face design is 2 cm, and the amount of induced electromagnetic field obtained by 10 turns of the A-face is 10 cm. The inner diameter is 2 cm, and the A-side is 6 cycles. The same induced electromagnetic field is obtained by two turns of the B surface. It proves that the number of turns and the line resistance can be reduced, and the induced electromagnetic field is obtained by the design of the present invention.

In the design of a single film coil, if only the A face design, the induced electromotive force or The induced current has an inverse relationship with the inner diameter of the coil and is proportional to the number of turns. For example, if the fixed coil has a wire diameter of 1 mm, a thickness of 0.5 mm, and an inner diameter of 2 cm, the film coil is responded to by an induced electromagnetic field with a number of turns of 6 turns. Under these conditions, the induced electromagnetic field is equivalent to a film coil having an inner diameter of 1.5 cm and a number of turns of 7 turns; it is also equivalent to a film coil having an inner diameter of 1 cm and a number of turns of 8 turns.

According to the above-mentioned induced electromotive force or induced current, there is an inverse relationship between the induced coil current and the inner diameter of the coil, and there is a proportional relationship with the number of turns. Therefore, if another film coil has the same concept as the above-mentioned thin film coil, it is effective to set a coil in the same direction as the A surface on the B surface. Reduce the overall number of coils and line resistance to obtain the same induced electromotive force and current, while improving wireless charging efficiency.

Referring to Fig. 11, there is shown a transmission signal waveform diagram of the transmitting end of the charging device fabricated by the thin film coil component proposed in the present invention, and Fig. 12 shows an inductive signal waveform diagram (single-sided thin film coil) as the receiving end of the electric device.

The area surrounded by the curves of the two graphs of Fig. 11 and Fig. 12 indicates the power conversion efficiency of the induced electromagnetic field, for example, calculated by the following formula (1), and the resulting power conversion efficiency is about 71.95%. The transmitting end curve encloses the area A1, and the receiving end curved surface emits the area A2. The horizontal axis represents the time axis, and the vertical axis amplitude represents the signal energy.

A2/A1=238/330.75=0.7195=71.95%-------Formula (1)

Taking the three-dimensional spiral structure of the thin film coil component as a double-sided film coil as an example, the waveform of the sensing signal at the receiving end is shown in Fig. 13. The formula (2) is to calculate the surface emitting area A3 of the receiving end curve A1 receiving end surface, and the obtained power is obtained. The utilization rate is about 79.238%, which is better than the power conversion efficiency (71.95%) of the single-sided film coil.

A3/A1=262.08/330.75=0.79238=79.238%-----Formula (2)

According to an embodiment, the line resistance of the film winding in the film coil disclosed in the disclosure is 0.0001 ohms to 30 ohms, and preferably the coil wire resistance is 0.05-0.1 ohms/cm 2 (cm ^{2 ).} The wire diameter is from 0.5 micrometers (um) to 10 millimeters (mm), and the preferred coil diameter is 0.45-2 mm; the line spacing is the distance between adjacent structures in the spiral structure, and the line spacing is from 1 micrometer to 10 millimeters. The coil has a line pitch of 5-170 μm; the film (such as copper) has a thickness of between 0.3 μm and 2 mm, preferably has a thickness of 10-140 μm; and the film surface resistivity is 0.1 to 0.000006 ohms/cm 2 ( Cm ² ), the preferred sheet resistance is 0.00001-0.0003 ohms/cm 2 (cm ² ).

Among them, in terms of the concept of coil design, the coil wire resistance is as low as possible, but considering the design of the three-dimensional film coil, the substrate of the high-gain stereo film coil can be flexible glass, alumina plate, PCB soft/hard board, ABS. Soft/hard board, PET film, PI film, magnetic film (eg sputtered Fe-Co-Ni-O or Fe-Mn-Zn-O or Fe-Ni-Zn-O ferrite film on PET substrate) A low-conductivity high-k material such as a composite substrate of Fe-Co-Ni-O or Fe-Mn-Zn-O or Fe-Ni-Zn-O ferrite powder combined with a polymer resin. It is also possible to use a superparamagnetic material with magnetic nano-iron oxide particles to enhance the induced electromagnetic field.

The film coil and the magnetic film can be formed by sputtering, vapor deposition, electroplating, electroless plating, coating, concave/relief printing, screen printing, yellow light process (exposure lithography), filming, transfer, and the like.

Therefore, the film coil, the 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 film coil system is mainly in the form of a circular spiral, but does not exclude other forms designed according to actual needs, such as a rectangular spiral, but it may also be a spiral of other shapes. In the spiral structure, it is designed to form a ring-shaped or rectangular structure having a certain width, and after being energized, an effect of generating an induced electromagnetic field such as a conventional copper wire coil can be produced, and since the loss due to the resistance of the conventional copper wire material is smaller, it can be effective. Improve the power generation efficiency per unit area and overcome the shortcomings 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

201‧‧‧First film winding

203‧‧‧First port

207‧‧‧First winding end point

Claims (16)

A film coil is composed of a spiral film winding, wherein the film winding is a conductor, and adjacent structures in the spiral structure have a spacing, and the outer side of the film winding has a connection of one of the external wires. And an inner end of the winding of the film has a winding end point; wherein an electric current between the connecting port and the end point of the winding forms an induced electromagnetic field. The film coil of claim 1, wherein the film winding has a line resistance distribution of 0.0001 ohms to 30 ohms; a wire diameter of 0.5 micrometers to 10 mm; and a line pitch of adjacent structures in the spiral structure, a line spacing It is from 1 micron to 10 mm; and the thickness is between 0.3 micron and 2 mm. The film coil of claim 2, wherein the film winding is a flexible copper film. The film coil of claim 3, wherein the spiral structure is a rectangular spiral structure or a circular spiral structure. The film coil of any one of claims 1 to 4, wherein a film core is formed at a central portion of the film winding of the spiral structure. A film coil component comprising: a substrate; a first film coil formed on the first surface of the substrate, consisting of a first film winding of a spiral structure, wherein the first film winding is in a spiral structure The adjacent structure 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 a second film coil is formed on the second surface of the substrate. And consisting of a second film winding of a spiral structure, wherein adjacent structures in the spiral structure of the second film winding have a distance equal to or different from the spacing, and the outer side of the second film winding has an external connection a second connection port of the line, the inner side has a second winding end point; and an electrical connection means electrically connecting the first film coil and the second film coil; The first film coil and the second film coil are coupled to the two surfaces of the substrate, and the spiral direction of the first film winding is the same as the spiral direction of the second film winding, and the first connection is The current between the second port and the second port forms an inductive electromagnetic field. The thin film coil component of claim 6, wherein the first winding end point and the second winding end point are electrically connected by a coil connecting portion, so that the first thin film coil is electrically connected to the second thin film coil . The film coil component according to claim 6 or 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. The film coil component of claim 6, wherein the first film coil and the second film coil are respectively formed on a magnetic film and bonded to both surfaces of the substrate. The thin film coil component of claim 6, wherein the substrate is a magnetic substrate. A charging device for charging a consumer device having a device-end thin film coil component, comprising: one or more thin film coil components, wherein each of the thin film coil components comprises: a substrate; a first thin film coil formed on the substrate The first surface is composed of a first film winding of a spiral structure, wherein adjacent structures in the spiral structure of the first film winding have a spacing, and the outer side of the first film winding has an external connection a first connection port, the inner side has a first winding end point; a second film coil formed on the second surface of the substrate is composed of a second film winding of a spiral structure, wherein the second film winding The adjacent structure in the spiral structure of the line has a distance equal to or different from the spacing, the outer side of the second film winding has a second connecting port of the outer connecting line, and the inner side has a second winding end point; An electrical connection means electrically connecting the first film coil and the second film coil; a power management unit electrically connecting the one or more thin film coil components; wherein the first film coil of each film coil component is The second film coil is coupled to the two surfaces of the substrate, and the spiral direction of the first film winding of the film coil component is the same as the spiral direction of the second film winding; and is formed on the charging device after being energized Inductive electromagnetic field in the direction. The charging device according to claim 11, wherein in the charging device formed by the 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 according to claim 11, wherein in each of the film coil components, the first winding end point and the second winding end point are electrically connected by a coil connecting portion, so that the first film coil and the second film are The film coil is electrically connected. The charging device according to claim 13, wherein in each of the film coil elements, a film core is formed in each of the first film winding of the spiral structure and the center of the second film winding. The charging device according to claim 11, wherein in each of the film coil components, the first film coil and the second film coil are respectively formed on a magnetic film and bonded to both surfaces of the substrate. The charging device according to claim 11, wherein in the film coil component, the substrate is a magnetic substrate.