TW201639271A - Coil, antenna device, wireless power supply module, electronic apparatus and wireless power supply system - Google Patents

Abstract

A coil includes a winding structure including a winding wire that is wound to have a first long side part and a second long side part that are opposed with each other, and have a first narrow side part and a second narrow side part that are opposed with each other, the winding structure having a major axis and a minor axis. One or more parts, in the winding wire, of the first long side part, the second long side part, the first narrow side part, and the second narrow side part each have an out-curved shape in which the winding wire is curved outwardly, the remainder in the winding wire having a substantially straight shape.

Description

Coils, antenna devices, contactless power supply modules, electronic machines and contactless power supply systems

The present invention relates to a coil formed by winding a winding wire, an antenna device having such a coil, a contactless power supply module, an electronic device, and a contactless power supply system.

In a mobile terminal such as a mobile phone terminal or a personal computer including a smart phone, a non-contact power supply function is gradually mounted, that is, a battery is transmitted (transmitted) in a non-contact (wireless) manner. Charging.

Further, for example, Patent Literatures 1 and 2 disclose such an antenna device including a non-contact power supply coil (a planar coil).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2013-5714

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2014-93795

Then, such a non-contact power supply coil is generally required to have a variation in shape (size), various characteristics, and the like. Also, it is required to enhance such various characteristics. Therefore, period It is hoped that such a method of reducing the deviation and improving the characteristics is proposed.

Therefore, it is desirable to provide a coil that can reduce variations or lift characteristics, an antenna device including such a coil, a contactless power supply module, an electronic device, and a contactless power supply system.

A coil according to an embodiment of the present invention includes: a winding shaft is wound so as to include first and second long side portions facing each other and first and second short side portions facing each other, and has a long axis And short-axis winding wire construction. At least one of the first and second long side portions and the first and second short side portions has a curved shape in which the winding wires are bent outward, and has a substantially linear shape.

An antenna device according to an embodiment of the present invention includes a coil that is configured to wind a winding wire so as to include first and second long side portions that face each other and first and second short side portions that face each other And a winding wire structure having a long axis and a short axis; and the magnetic layer is disposed to overlap at least a portion of the coil. At least one of the first and second long side portions and the first and second short side portions has a curved shape in which the winding wires are bent outward, and has a substantially linear shape.

A contactless power supply module according to an embodiment of the present invention includes an antenna device and an electronic component. The antenna device includes a coil and is configured to wind a winding wire so as to include first and second long side portions facing each other and first and second short side portions facing each other, and has a long axis and a short length. The winding wire structure of the shaft; and the magnetic layer are disposed to overlap at least a portion of the coil. At least one of the first and second long side portions and the first and second short side portions has a curved shape in which the winding wires are bent outward, and has a substantially linear shape.

An electronic device according to an embodiment of the present invention is provided with an antenna device and an electric device Contactless power supply module for sub-parts. The antenna device includes a coil and is configured to wind a winding wire so as to include first and second long side portions facing each other and first and second short side portions facing each other, and has a long axis and a short length. The winding wire structure of the shaft; and the magnetic layer are disposed to overlap at least a portion of the coil. At least one of the first and second long side portions and the first and second short side portions has a curved shape in which the winding wires are bent outward, and has a substantially linear shape.

A contactless power supply system according to an embodiment of the present invention includes: a first contactless power supply module; and a second contactless power supply module that transmits power in a non-contact manner to the first contactless power supply module. The first and second contactless power supply modules respectively have an antenna device and an electronic component. The antenna device of at least one of the first and second contactless power supply modules includes: a coil having first and second long side portions that face each other and first and second short side portions that face each other The winding wire structure is formed by winding a winding wire and having a long axis and a short axis; and the magnetic layer is disposed so as to overlap at least a part of the coil. At least one of the first and second long side portions and the first and second short side portions has a curved shape in which the winding wires are bent outward, and has a substantially linear shape.

Further, the "coil", "magnetic layer", "winding wire", "electronic component", "antenna device", and "(first and second) contactless power supply module" of the present invention include One or more (2 or more) of any one concept.

According to the coil, the antenna device, the contactless power supply module, the electronic device, and the contactless power supply system of the present invention, it is possible to reduce the variation or the lifting characteristics.

1,1A~1D, 300‧‧‧Antenna device

11,11A~11D‧‧‧ coil

110‧‧‧Wire

111‧‧‧fusion layer

12‧‧‧Magnetic layer

2A, 302A‧‧‧Power transmission module

2B, 302B‧‧‧Power Module

21, 22‧‧‧ Functional Department

210,220‧‧‧Electronic parts

3A, 3B, 3B1, 3B2, 303A, 303B‧‧‧ Electronic machines

4,4A~4C‧‧‧Contactless power supply system

9‧‧‧Power coil

LLp, LLn‧‧‧ long side

LSp, LSn short side

Lc‧‧‧ corner

Lb‧‧‧Transformation Department

W1‧‧‧ winding wire

R‧‧‧ radius of curvature

△Wc, △WL‧‧‧ amplitude

△dc, △dL‧‧‧ thickness

D1, d2‧‧‧ thickness

Pt‧‧‧Power

Fig. 1 is a schematic view showing an example of a planar structure of an antenna device according to an embodiment of the present invention.

Fig. 2 is a schematic view showing a plan view of an antenna device of a comparative example.

Fig. 3 is a view showing an example of a cross-sectional structure of a coil of the antenna device shown in Fig. 2;

Fig. 4 is a view showing an example of a cross-sectional structure of a coil of the antenna device shown in Fig. 1;

Fig. 5 is a view showing an example of a positioning state between a coil of the antenna device shown in Fig. 2 and an external power transmitting coil.

Fig. 6 is a view showing an example of a positioning state between a coil of the antenna device shown in Fig. 1 and an external power transmitting coil.

Fig. 7 is a view showing respective parameters of the antenna device of the comparative example and the embodiment.

Fig. 8 is a schematic view showing an example of a planar structure of an antenna device of a comparative example and an embodiment.

FIG. 9 is a schematic diagram showing an example of a planar structure of an antenna device according to Modifications 1 to 4 of the present invention.

Fig. 10A is a view showing a block configuration example of a contactless power supply system according to a first application example of the present invention.

Fig. 10B is a view showing a block configuration example of the contactless power supply system of Application Example 2 of the present invention.

Fig. 10C is a view showing a block configuration example of the contactless power supply system of the application example 3 of the present invention.

Fig. 10D is a view showing a block configuration example of the contactless power supply system of Application Example 4 of the present invention.

An embodiment of the present invention will be described in detail below with reference to the drawings. In addition, the explanation is performed in the following order.

1. Embodiment (Basic configuration example of an antenna device having a coil having a curved shape)

2. Modifications

Modifications 1 to 4 (other structural examples of the curved shape of the coil)

3. Application examples (Applicable examples 1 to 4: Application examples for non-contact power supply modules, electronic equipment and contactless power supply systems)

4. Other variants

<1. Embodiment>

[structure]

Fig. 1 is a view schematically showing an example of a planar structure of an antenna device (antenna device 1) according to an embodiment of the present invention (a configuration example of the above X-Y). The antenna device 1 is an antenna device (a contactless power supply antenna device) having a contactless power supply function (a non-contact power transmission function, a non-contact power transmission function, or a power receiving function) to be described later.

Further, the antenna device 1 can be used for any of power transmission and power reception at the time of such contactless power supply. In addition, when the frequency band of the antenna device 1 is, for example, an international standard specification Qi standard established by WPC (Wireless Power Consortium), it is about 100 kHz to 200 kHz.

As shown in FIG. 1, the antenna device 1 includes a coil 11 and a magnetic layer 12.

(coil 11)

The coil 11 is a coil formed by winding one or more winding wires w1 by a predetermined number of turns (number of turns) on a magnetic layer 12 to be described later. As shown in FIG. 1, the coil 11 has a substantially rectangular winding wire structure including a pair of long side portions LLp and LLn extending along the Y-axis direction (long-axis direction) along the X-axis direction. a pair of short side portions LSp and LSn extending in the short axis direction, and Four corners Lc arranged between (four corner regions). The pair of long side portions LLp and LLn are arranged to face each other, and the pair of short side portions LSp and LSn are arranged to face each other. Further, the winding wire structure of the coil 11 has a long axis (Y axis) and a short axis (X axis) as shown in FIG. Further, the long side portions LLp and LLn correspond to a specific example of the "first and second long side portions" of the present invention, and the short side portions LSp, LSn correspond to the "first and second short side portions" of the present invention. A specific example.

Further, in this example, as shown in FIG. 1, the long side portions LLp and LLn of the long side portions LLp and LLn and the short side portions LSp and LSn are bent toward the outer side of the antenna device 1 by the winding wires w1, respectively. The deflected portion Lb. In other words, the long side portions LLp and LLn each have a curved shape in which the winding wire w1 is bent toward the outer side of the antenna device 1. On the other hand, the winding wires w1 of the short side portions LSp and LSn extend in a substantially straight shape in this example. In other words, the short side portions LSp and LSn have substantially straight lines. Further, as shown in FIG. 1, the end portions of the winding wires w1 of the coil 11 are respectively pulled out to the outside of the antenna device 1 in the -Y-axis direction in this example.

Such a winding wire w1 is a wire having a predetermined cross-sectional area as shown in a schematic cross-sectional structural example (Z-X cross-sectional structural example) in the symbol P1 of FIG. 1 . Further, the winding wire w1 has a cross-sectional structure in which an insulating layer (not shown) and a fusion layer 111 are sequentially covered on the outer circumferential surface of the wire 110. The wire 110 is made of, for example, a conductive material such as Cu (copper) or Al (aluminum). Further, the fusion layer 111 is made of, for example, a resin material such as a denatured polyester resin, a urethane resin, or a polyamide resin. With such a cross-sectional structure, as will be described in detail later, the adjacent winding wires w1 and the winding wires w1 are fixed to each other between the magnetic layers 12 to be described later (see FIGS. 4(A) and (B) to be described later). Further, as the winding wire w1, in addition to a single wire, a plurality of parallel wires and braided wires which are formed by bundling a plurality of thin wires which are thinner than a single wire may be used. Further, it is also possible to form the winding wire w1 into a one-layer or two-layer α-volume using a thin-width flat line or a flat wire. Further, as the coil 11, in order to reduce the thickness of the coil 11, it is possible to An FPC (Flexible Printed Circuit) coil made by patterning a conductor on one or both sides of a dielectric substrate.

Such various sizes of the coil 11 are as described below in the case of power supply for small power such as a smart phone. In other words, the lengths of the long side portions LLp and LLn (the length in the Y-axis direction) are, for example, about 15 mm to 70 mm, and the lengths of the short side portions LSp and LSn (the length in the X-axis direction) are, for example, about 8 mm to 50 mm. Further, the lengths of the long side portions LLp and LLn and the short side portions LSp and LSn respectively indicate the distance between the outer edges of the coils 11 including the corner portions Lc. Further, when the degree of curvature (curvature) of the curved portion Lb is used for power supply such as a smart phone, for example, the radius of curvature R (the radius of curvature of the inner diameter of the coil 11) may be about 15 mm to 90 mm.

Further, the shape of the winding wire structure of the coil 11 (the long side portions LLp, LLn (bending portion Lb); the short side portions LSp, LSn and the shape of the corner portion Lc) are formed, for example, as follows. In other words, a jig having such a shape (a shape having a desired curvature) is prepared in advance, and the winding wire w1 which is a self-fusion line is wound around the jig, and the fusion layer 111 is melted by heat or the like to make the adjacent layer The winding wires are adhered to each other (fixed). Thereby, such a winding wire structure (winding wire configuration having the bent portion Lb) is realized.

(magnetic layer 12)

The magnetic layer 12 is disposed so as to overlap at least a part of the coil 11 , and in this example, as shown in FIG. 1 , it is disposed so as to overlap the entire (full area) of the coil 11 . Moreover, the magnetic layer 12 is disposed below the coil 11 through a binder (adhesive layer) (not shown). In other words, the coil 11 and the magnetic layer 12 are bonded to each other by such an adhesive (for example, a general inorganic type adhesive, an organic type adhesive or a double-sided tape, etc.). Further, in the case where the magnetic layer 12 is a resin magnetic body composed of magnetic powder, resin, or the like, a resin magnetic body can be used as such a binder.

Further, as shown in FIG. 1, the magnetic layer 12 has a rectangular shape having a long axis (Y-axis direction) and a short axis (X-axis direction) and has a predetermined thickness (length in the Z-axis direction). ) flaky. Further, the size of the magnetic layer 12 is as described below in the case of power supply for small power such as a smart phone. That is, the long axis length is, for example, about 15 mm to 75 mm, the short axis length is, for example, about 8 mm to 70 mm, and the thickness is, for example, about 20 μm to 2 mm.

The magnetic layer 12 is made of a magnetic material having a magnetic permeability suitable for contactless power supply using the coil 11 described later. Examples of such a magnetic material include an oxide magnetic body such as ferrite, a crystal magnetic body such as a ferrosilicon (Fe (iron)-Si (silicon)-Al alloy), and Fe-Si-B (boron). An amorphous magnetic body such as -Cr (chromium), or a resin magnetic body or a powder molded magnetic body obtained by mixing the magnetic particles and a resin. Further, a plurality of the magnetic materials may be used in combination, or a laminated structure in which the respective magnetic layers are laminated may be used.

[effect. effect]

(A. Basic action)

In the antenna device 1, a non-contact power transmission operation using a magnetic field (using an electromagnetic induction method, a magnetic field resonance method, or the like) is performed between another antenna device (not shown). Specifically, the antenna 11 is used in the antenna device 1, and a non-contact power transmission operation (power supply operation) is performed between the non-contact power supply coils (not shown) of the other antenna devices. That is, a non-contact power transmission operation or a power reception operation is performed.

(B. The role of the antenna device 1)

Next, the effect of such an antenna device 1 (the role of the coil 11 portion) is compared with one side. For comparison, a detailed description will be given.

Fig. 2 is a view schematically showing an example of a plan view of a configuration of an antenna device (antenna device 100) of a comparative example (a configuration example of the above X-Y). The antenna device 100 of this comparative example is an antenna device having the same contactless power supply function as the antenna device 1, and includes a coil 101 and a magnetic layer 12. That is, the antenna device 100 corresponds to the antenna device 1, and the coil 101 is provided instead of the coil 11, and other configurations are basically the same as those of the antenna device 1.

As shown in FIG. 2, the coil 101 has a substantially rectangular winding wire structure including a pair of long side portions LLp and LLn extending in the Y-axis direction and a pair of short extending along the X-axis direction. The side portions LSp and LSn and the four corner portions Lc disposed between the sides. That is, the winding wire configuration of the coil 101 is similar to the aforementioned winding wire configuration of the coil 11.

However, as shown in FIG. 2, in the coil 101, unlike the coil 11, the long-side portions LLp and LLn and the winding wires w1 of the short-side portions LSp and LSn all extend in a substantially linear shape. That is, the winding wires w1 of the long side portions LLp and LLn have no bent portion Lb.

Further, since the antenna device for contactless power supply (for example, the power receiving antenna) requires a certain area because it is installed, it is generally used for sticking to a battery pack (rectangular shape) incorporated in various electronic devices. Further, in such an antenna device, it is necessary to secure a certain size of inductance due to the relationship with the circuit system, and since it is formed in a limited area, the magnetic body is generally used according to the shape of the rectangular battery pack described above. The coil is set to have a substantially rectangular shape (a substantially rectangular shape).

In the antenna device 100 of the comparative example configured as such, the following problems occur.

Here, FIG. 3(A) shows the line along the line IV-IV shown in FIG. 2 (the portion of the corner portion Lc) In the example of the cross-sectional structure of the coil 101 (the cross-sectional structure example of the adjacent winding wire w1). Moreover, FIG. 3(B) shows an example of a cross-sectional structure of the coil 101 as seen along the V-V line (portion of the long side portion LLp) shown in FIG. 2.

Comparing FIG. 3(A) with FIG. 3(B), the following conclusion can be drawn in the coil 101 of the antenna device 100.

In other words, in the corner portion Lc shown in Fig. 3(A), when the winding wire w1 is wound around the jig, the winding wire w1 is relatively strongly pressed toward the inner side (refer to Fig. 3(A)). The solid arrow in the line F). As a result, in the corner portion Lc, as shown in FIG. 3(A), the winding wires w1 constituting the coil 101 are wound in a state of being blocked.

On the other hand, in particular, as shown in the long side portion LLp shown in Fig. 3(B), in the portion of the linear shape other than the corner portion Lc, when the winding wire w1 is wound around the jig, the winding wire w1 is relatively opposed The inner side is pressed weakly (refer to the dotted arrow F in Fig. 3(B)). Therefore, as shown in FIG. 3(B), in the long side portion LLp, the adhesion between the winding wires w1 is weaker than the above-described corner portion Lc, and as a result, the winding wire w1 is along the width direction of the coil 101. There is a gap between them. This is because the winding wires w1 are easily unwound from each other if the winding wires w1 are wound in a state in which they are not in close contact with each other.

Thus, in the antenna device 100 (coil 101) of the comparative example, first, as a whole (full circle) of the coil 101, variations in size (size in the amplitude direction and thickness direction) become large. Specifically, in this example, as shown in FIGS. 3(A) and 3(B), the difference between the amplitude ΔWc of the coil 101 of the corner portion Lc and the amplitude ΔWL of the long side portion LLp becomes large. Further, the deviation of the thickness ΔdL of the long side portion LLp is larger than the deviation of the thickness Δdc of the corner portion Lc. Further, when the winding wires w1 are wound in a state in which the winding wires w1 are not in close contact with each other as shown in FIG. 3(B), the coil 101 is easily unwound and warped (the winding wire w1 is from the magnetic layer 12). Fall off). Therefore, the antenna device 100 of the comparative example (line In the coil 101), variations in electrical characteristics such as inductance increase, and transmission characteristics are degraded (resonance deviation occurs), thickness reduction of the antenna device 100 is hindered, and reliability is caused by unwinding and warping of the coil 101. Reduced sex.

In the antenna device 1 (coil 11) of the present embodiment, as shown in FIG. 1, the long side portions LLp and LLn and the long side portions LLp and LLn of the short side portions LSp and LSn are respectively wound to the outside of the winding line w1. Curved bent portion Lb. Therefore, in the present embodiment, unlike the comparative example described above, it becomes as follows.

Here, FIG. 4(A) shows an example of a cross-sectional structure of the coil 11 (an example of a cross-sectional structure of the adjacent winding wire w1) as viewed along a line II-II (a portion of the corner portion Lc) shown in FIG. 1 . Moreover, FIG. 4(B) shows an example of a cross-sectional structure of the coil 11 as viewed along the line III-III (portion of the long side portion LLp) shown in FIG.

When the coil 11 is compared with FIG. 4(A) and FIG. 4(B), the following conclusion can be drawn. That is, first, in the corner portion Lc shown in Fig. 4(A), as in the case of the coil 101 of the comparative example shown in Fig. 3(A), when winding the winding wire w1 to the above-mentioned tool, the winding wire W1 is relatively strongly pressed toward the inner side (refer to the solid arrow F in Fig. 4(A)). As a result, in the corner portion Lc, as shown in FIG. 4(A), the winding wires w1 constituting the coil 11 are wound in a state of being blocked.

Further, in the long side portion LLp (and the long side portion LLn) shown in FIG. 4(B), as in the case of the above-described corner portion Lc, when the winding wire w1 is wound around the jig, the winding wire w1 is relatively It is strongly pressed toward the inner side (refer to the solid arrow F in Fig. 4(B)). This is because the shape of the jig is curved outward in the portion corresponding to the long side portions LLp and LLn as described above, so that the portion of the winding wire w1 is easily pressed toward the inner side. As a result, in the long side portions LLp and LLn of the coil 11, unlike the comparative example (see FIG. 3(B)), as shown in FIG. 4(B), The corner portions Lc are the same, and the winding wires w1 constituting the coil 11 are wound in a state of being blocked.

The coil 11 is different from the coil 101 of the above comparative example in the following manner.

That is, first, the dimensional deviation (deviation in the amplitude direction and the thickness direction) of the entire coil (full circumference) is smaller than that of the coil 101. In addition, in the present embodiment, the variation in the thickness direction can be suppressed, because the tension applied to the winding wire w1 when winding the winding wire w1 can be reduced, so that the winding wires w1 of the corner portion Lc are mutually The alignment between them becomes good, and the winding unevenness of the winding wire w1 can be suppressed. Specifically, in this example, as shown in FIGS. 4(A) and 4(B), the amplitude ΔWc of the coil 11 at the corner portion Lc and the amplitude of the long side portion LLp (and the long side portion LLn) are Δ. Between WL, the difference becomes smaller (preferably there is almost no difference). Further, the variation in the thickness ΔdL of the long side portion LLp is small (the deviation from the thickness Δdc of the corner portion Lc is substantially the same).

Further, in the coil 11, the winding wires w1 are wound in close contact with each other in the long side portions LLp and LLn except for the corner portion Lc. Therefore, unlike the coil 101 of the comparative example, the coil 11 is less likely to occur. Unwinding, warping (preferably not happening).

Therefore, in the antenna device 1 (coil 11) of the present embodiment, unlike the antenna device 100 (coil 101) of the comparative example, the transmission characteristic degradation (resonance deviation, etc.) due to an increase in variation in electrical characteristics such as inductance is avoided. The resulting transfer characteristics are improved. Moreover, compared with the antenna device 100, the thickness can be reduced, and the reliability (reliability improvement) due to the unwinding and warpage of the coil 11 can be avoided.

Here, as shown in FIG. 5, in the coil 101 of the above-described comparative example, particularly when used as a power receiving coil at the time of contactless power supply, the following problem occurs.

That is, first, about portable terminals such as smart phones, in general, the former The Qi specification is the mainstream. Further, in the Qi specification, as the coil on the power transmitting side, the power transmitting coil 9 shown in Fig. 5 has a large circular shape.

Therefore, when the coil 101 of the substantially rectangular shape of the comparative example is used as the power receiving coil, it is not possible to efficiently receive a part of the magnetic flux transmitted from the circular power transmitting coil 9. As is apparent from Fig. 5, this is because one of the inner circumferential sides of the coil 101 having a substantially rectangular shape enters the inside of the circular power transmission coil 9. As a result, when the coil 101 of the comparative example is used as the power receiving coil, the coupling coefficient (magnetic coupling coefficient) k between the power transmitting coil 9 and the coil 101 is lowered, resulting in transmission efficiency at the time of contactless power supply (power supply efficiency) ) also fell.

In the coil 11 of the present embodiment, the long side portions LLp and LLn and the long side portions LLp and LLn of the short side portions LSp and LSn are curved outwardly by the winding wire w1. Part Lb. Therefore, when the coil 11 is used as the power receiving coil, the magnetic flux transmitted from the circular power transmitting coil 9 can be efficiently received (picked up) as compared with the case of the coil 101 of the comparative example. As a result, in the coil 11, the coupling coefficient k between the power transmission coil 9 and the power transmission coil 9 is increased, and the transmission efficiency (power supply efficiency) at the time of contactless power supply is also increased.

Further, in the case of using such a power receiving coil, as a coil shape for receiving magnetic flux from a circular shape of the power transmission coil as efficiently as possible, a circular shape or an elliptical shape may be considered. When the coil of such a shape is used as the power receiving coil, as described above, the power transmission coil has a circular shape, and as in the present embodiment, the magnetic flux from the power transmission coil can be efficiently received, and the coupling is compared with the comparative example. The coefficient k rises. However, in the case where an antenna device is provided on a device such as a smart phone, as described above, it is disposed in a limited rectangular shape region such as a battery pack, and it is necessary to obtain an inductance and a coupling system in the region. The balance of a few k. In a coil having a substantially rectangular shape in which a rectangular shaped region can be effectively utilized, although the inductance is easily increased, it is not easy to increase the coupling coefficient k as described above. On the other hand, in the coil of a circular shape, although it is easy to raise the coupling coefficient k, since one part of the above-mentioned rectangular-shaped area is wasted, it is not easy to increase inductance. Therefore, the coil shape of the present embodiment can be said to be suitable in order to increase the inductance and effectively correspond to the power transmission coils of various shapes suitable for the Qi specification.

As described above, in the present embodiment, the long side portions LLp and LLn of the long side portions LLp and LLn and the long side portions LLp and LLn of the short side portions LSp and LSn are bent portions Lb which are bent outward by the winding line w1. The following effects can be obtained. That is, it is possible to reduce the dimensional deviation of the entire coil 11 (full turn), and to make the unwinding and warping of the coil 11 less likely to occur. Therefore, it is possible to avoid a decrease in transmission characteristics (resonance deviation or the like) due to an increase in variation in electrical characteristics such as inductance, and it is possible to improve transmission characteristics. Moreover, the thickness of the antenna device 1 can be reduced, and the reliability due to the unwinding and warpage of the coil 11 can be avoided, and the reliability can be improved. Further, since the dimensional deviation of the coil 11 can be reduced as described above, the degree of freedom in designing the antenna device 1 when the housing is mounted can be improved (for example, mounting with a small dimensional tolerance when the housing is loaded).

Further, as described above, when the coil 11 is used as the power receiving coil, the following effects can be obtained. In other words, since the magnetic flux transmitted from the power transmission coils of various shapes suitable for the Qi specification can be efficiently received, the coupling coefficient k with the power transmission coil is increased, and as a result, the transmission efficiency at the time of the contactless power supply can be improved (power supply) effectiveness).

Further, in the coil 11 of the present embodiment, since both of the pair of long side portions LLp and LLn are the curved portion Lb, the following effects can be obtained. In other words, for example, Modification 3 (see FIG. 9(C) described later), and one of the long side portions LLp and LLn is curved. In comparison with the case of the portion Lb, the dimensional deviation, the variation in electrical characteristics, and the like as described above can be further reduced. Therefore, it is possible to further improve the transmission characteristics, and it is possible to further improve the reliability.

Further, in the coil 11, since the adjacent winding wires w1 are fixed to each other, the dimensional deviation (deviation in the amplitude direction and the thickness direction) of the coil 11 can be further reduced. Therefore, this point can also further improve the transmission characteristics and further improve the reliability.

[Examples]

Here, specific examples (Examples 1 to 4) of the present embodiment will be described while being compared with the above-described comparative example (see FIG. 2).

Fig. 7 is a table in which the respective parameter values of the comparative example and the examples 1 to 4 are arranged. Specifically, in FIG. 7 , the value of the curvature radius R of the curved portion Lb of the coil 11 (the radius of curvature of the inner diameter in the short-axis direction (X-axis direction) of the coil 11) is changed to R=16 mm. In the case of Example 1), R=42 mm (Example 2), R=52 mm (Example 3), and R=82 mm (Example 4), when the coil 11 is used as a power receiving coil, the power transmitting coil 9 is used. The value of the coupling coefficient k between. In addition, the analysis of the coupling coefficient k (three-dimensional electromagnetic field analysis) uses the electromagnetic field analysis software Maxwell of ANSYS.

In addition, FIG. 7 shows a comparison with the coil 101 (rectangular type shown in FIG. 2) of the comparative example, and the coupling with the power transmission coil 9 when the coil 101 is used as a power receiving coil. The value of the coefficient k.

On the other hand, FIGS. 8(A) to 8(D) schematically show the antenna device 100 (coil 101) of the comparative example and the first, second, and fourth embodiments in the comparative examples and the first to fourth embodiments. Antenna An example of a plan view of each of the devices 1 (coils 11) (a configuration example of the upper surface of X-Y). Specifically, FIG. 8(A) shows a planar structure example of the antenna device 100 of the comparative example, FIG. 8(B) shows a planar structure example of the antenna device 1 of the first embodiment, and FIG. 8(C) shows an antenna of the second embodiment. An example of a plan view of the antenna device 1 of the fourth embodiment is shown in FIG. 8(D). Further, in FIGS. 8(A) to 8(D), in order to simplify the illustration, the portion of the winding wire w1 that is pulled out to the outside is omitted.

Here, in the comparative examples and the first to fourth embodiments, the coil diameters, the number of turns, and the major axis size (the size in the Y-axis direction) of the coils 11 and 101 are all the same. Further, the shape of the short-axis direction (X-axis direction) of the coils 11 and 101 is adjusted so as not to extend beyond the region on the magnetic layer 12, so that the antenna devices 1 and 100 of the comparative example and the first to fourth embodiments are adjusted. The self-inductance L is approximately the same value of 13 μH.

Further, in each of the first to fourth embodiments and the comparative examples, the detailed configurations of the power transmission coil 9, the coil 11, the coil 101, and the magnetic layer 12 are as follows.

. Power transmission coil 9: The aforementioned circular shape (suitable for A10 of Qi specification)

. Conductor diameter of the coil 11: 0.26 mm

. Number of turns of the coils 11, 101: 14 turns (double wire winding)

. Size of magnetic layer 12 (magnetic sheet): (35 mm × 46 mm) × 0.3 mm (thickness)

. Magnetic permeability of magnetic layer 12 (magnetic sheet): 100

From the above Figures 7 and 8, the following points were confirmed.

That is, first, as shown in FIG. 7, it is understood that the comparison of the first to fourth embodiments having the coil 11 including the curved portion Lb and the coil 101 having a substantially rectangular shape (rectangular shape) under the condition that the self-inductance L is substantially constant In comparison with the example, the value of the coupling coefficient k with the power transmission coil 9 is high. Therefore, by using the coil 11 including the curved portion Lb, it is possible to confirm an increase in power transmission efficiency at the time of contactless power supply. Further, as shown in FIG. 7, in the first to fourth embodiments, it is known that The value of the radius of curvature R of the curved portion Lb becomes smaller (the curvature becomes larger), and the value of the coupling coefficient k gradually increases. Specifically, in this example, it is understood that the coupling coefficient k becomes the maximum value (k=0.767) when the minimum value R of the curvature radius R is 16 mm (Example 1).

Here, the minimum value (the maximum value of the curvature) of the curvature radius R of the curved portion Lb is as shown in FIGS. 8(B) to 8(D), and the short side portions LSp and LSn of the coil 11 may exist separately. Set within the range (in the range where the area of the substantially linear shape does not disappear). In short, as shown in FIG. 8(B), the lower limit of the radius of curvature R of each of the long side portions LLp and LLn (curved portion Lb) is defined by the limit states in which the short side portions LSp and LSn can respectively exist ( Upper limit of curvature).

Specifically, as shown in FIG. 8(A), if half of the dimension of the inner diameter of the inner diameter of the coils 11 and 101 (the Y-axis direction) is Ly, the short-axis direction of the inner diameter (the X-axis direction) The half of the size of the radius L is roughly defined as {(Lx2+Ly2)/(2×Lx)}. However, if the radius of curvature R is too small, the coil 11 will protrude from the magnetic layer 12. Therefore, it is necessary to consider this point to determine the minimum value of the radius of curvature R. In short, the range of the radius of curvature R is premised on the case where the maximum amplitude of the winding axis structure of the coil 11 in the short-axis direction is constant (determined value).

On the other hand, the maximum value of the curvature radius R (the minimum value of the curvature) can be specified as follows. That is, the maximum value of the radius of curvature R depends on the tension (Tension) when winding the winding wire w1, but is approximately 3 to 4 times the size of the major axis direction (Y-axis direction) of the inner diameter of the coil 11. about. This is because if the value of the radius of curvature R is larger than this, a sufficient pressing force is not obtained between the adjacent winding wires w1, and the adhesion between the winding wires w1 is insufficient.

<2. Modifications>

Next, a modification (Modifications 1 to 4) of the present invention will be described. The same components as those of the above-described embodiments are denoted by the same reference numerals, and their descriptions are omitted as appropriate.

9(A) to 9(D) schematically show a planar structure example (a configuration example of the upper surface of X-Y) of the antenna devices (antenna devices 1A to 1D) according to Modifications 1 to 4. Specifically, FIG. 9(A) shows a plan view configuration example of the antenna device 1A according to the first modification, and FIG. 9(B) shows a plan view structure example of the antenna device 1B according to the second modification. 9(C) shows an example of a planar structure of the antenna device 1C according to the third modification, and FIG. 9(D) shows an example of a planar structure of the antenna device 1D of the fourth modification. Further, in the above-described FIGS. 9(A) to 9(D), the portion of the winding wire w1 that is pulled out to the outside is omitted for the sake of simplicity.

Similarly to the antenna device 1 of the embodiment, the antenna devices 1A to 1D are all antenna devices having a contactless power supply function. Further, each of the antenna devices 1A to 1D includes a coil (coils 11A to 11D to be described later) and a magnetic layer 12.

However, in the coils 11A to 11D of the antenna devices 1A to 1D, the arrangement of the curved portion Lb is different from that of the coil 11 of the antenna device 1.

[Modification 1]

Specifically, the antenna device 1A of the first modification shown in FIG. 9(A) corresponds to the antenna device 1, and the coil 11A is provided instead of the coil 11, and the other structure is basically the same as that of the antenna device 1.

In the coil 11A, in addition to the long side portions LLp and LLn, the short side portions LSp and LSn are curved portions Lb in which the winding wires w1 are bent toward the outer side of the antenna device 1A. That is, as shown in FIG. 9(A), the long side portions LLp and LLn and the short side portions LSp and LSn of the coil 11A are all curved portions Lb.

Further, the curvature (curvature radius R) of the curved portion Lb of the long side portions LLp and LLn and the curvature of the curved portion Lb of the short side portions LSp and LSn are different from each other. Specifically, in this example, As shown in FIG. 9(A), the curvature of the curved portion Lb of the long side portions LLp and LLn is smaller than the curvature of the curved portion Lb of the short side portions LSp and LSn. In other words, the curvature radius R of the curved portion Lb of the long side portions LLp and LLn is larger than the curvature radius R of the curved portion Lb of the short side portions LSp and LSn.

In the present modification having such a configuration, substantially the same effects as those of the above-described embodiment can be obtained.

In addition, in the present modification, in addition to the long side portions LLp and LLn, the short side portions LSp and LSn are also the curved portion Lb, so that the following effects can be obtained. In other words, in the coil 11 of the embodiment, the dimensional deviation, the variation in electrical characteristics, and the like can be further reduced as compared with the case where only the long side portions LLp and LLn are the curved portions Lb. Therefore, it is possible to further improve the transmission characteristics and further improve the reliability.

[Modification 2]

The antenna device 1B according to the second modification shown in FIG. 9(B) corresponds to the antenna device 1, and the coil 11B is provided instead of the coil 11, and the other structure is basically the same as that of the antenna device 1.

In the coil 11B, as the alternative long side portions LLp and LLn, the short side portions LSp and LSn are curved portions Lb each of which is bent toward the outer side of the antenna device 1B by the winding wire w1. That is, as shown in FIG. 9(B), the short side portions LSp and LSn are the curved portions Lb, respectively, and the winding wires w1 of the long side portions LLp and LLn each extend in a substantially linear shape.

In the present modification having such a configuration, substantially the same effects as those of the above-described embodiment can be obtained.

However, in the case where only the short side portions LSp and LSn of the present modification are the curved portions Lb, it is possible to reduce variations in size, variations in electrical characteristics, and the like, compared to the comparative example. The coupling coefficient k between the power transmission coil 9 of the aforementioned circular shape cannot be increased. Therefore, it can be said that it is preferable to have the curved portion Lb at least on the long side portions LLp and LLn, which also contributes to the improvement of the coupling coefficient k.

[Modification 3]

The antenna device 1C according to the third modification shown in FIG. 9(C) corresponds to the antenna device 1, and the coil 11C is provided instead of the coil 11, and the other structure is basically the same as that of the antenna device 1.

In the coil 11C, only the long side portion LLp of the pair of long side portions LLp and LLn is a curved portion Lb in which the winding wire w1 is bent to the outside of the antenna device 1C. That is, as shown in FIG. 9(C), the long side portion LLp is a curved portion Lb, and the long side portion LLn and the short side portions LSp and LSn are each wound in a substantially straight line shape.

In the present modification having such a configuration, substantially the same effects as those of the above-described embodiment can be obtained. However, in the present modification, since only the long side portion LLp of the pair of long side portions LLp and LLn is the curved portion Lb, it can be said that the effect is somewhat smaller than in the case of the embodiment.

[Modification 4]

The antenna device 1D according to the fourth modification shown in FIG. 9(D) corresponds to the antenna device 1, and the coil 11D is provided instead of the coil 11. The other structure is basically the same as that of the antenna device 1.

In the coil 11D, only the short side portion LSp of the pair of short side portions LSp and LSn is a curved portion Lb in which the winding wire w1 is bent to the outside of the antenna device 1D. That is, as shown in FIG. 9(D), the short side portion LSp is the curved portion Lb, and the short side portion LSn and the long side portions LLp and LLn are each wound in a substantially straight line shape.

In the present modification having such a configuration, substantially the same effects as those of the above-described modification 2 can be obtained. However, in the present modification, since only the short side portion LSp of the pair of short side portions LSp and LSn is the curved portion Lb, it can be said that the effect is somewhat smaller than in the case of the second modification.

In this way, as in the above-described embodiment and the modifications 1 to 4, at least one of the long side portions LLp and LLn and the short side portions LSp and LSn (at least one of the four sides of the coil) is provided. The curved portion Lb is sufficient.

<3. Application example>

Next, application examples (application examples 1 to 4) of the coils (coils 11, 11A to 11D) and antenna devices (antenna devices 1, 1A to 1D) of the above-described embodiments and modifications 1 to 4 will be described. In addition, the same components as those of the above-described embodiment and the like are denoted by the same reference numerals, and their description will be omitted as appropriate.

10A to 10D are diagrams schematically showing a block configuration example of the contactless power supply systems (contactless power supply systems 4, 4A to 4C) according to the application examples 1 to 4 of the present invention. Specifically, FIG. 10A shows a block configuration example of the contactless power supply system 4 of the first application example, and FIG. 10B shows a block configuration example of the contactless power supply system 4A of the application example 2. Further, Fig. 10C shows a block configuration example of the contactless power supply system 4B of the application example 3, and Fig. 10D shows a block structure example of the contactless power supply system 4C of the application example 4.

[Application 1]

The contactless power supply system 4 of the application example 1 shown in FIG. 10A is provided with one or more (in this example) One is an electronic device 3A and one electronic device 3B. The contactless power supply system 4 is a system in which the electronic device 3A can transmit the power Pt in a non-contact manner (using the electromagnetic induction method, the magnetic field resonance method, or the like) to the electronic device 3B.

The electronic device 3A is, for example, an electronic device such as a non-contact charging tray, and has one or a plurality of (in this example, one) power transmission module 2A. The power transmission module 2A includes a module (a contactless power supply module on the power transmitting side) that transmits a power Pt (a non-contact power transmission function) in a non-contact manner to a power receiving module 2B in an electronic device 3B to be described later. The power transmission module 2A includes one or more (in this example, one) antenna device 1 (or any of the antenna devices 1A to 1D described in Modifications 1 to 4) described in the above embodiment. And a functional portion 21 including one or more electronic components 210. Further, the power transmission module 2A corresponds to a specific example of the "contactless power supply module (second contactless power supply module)" of the present invention.

The functional unit 21 is a portion (circuit portion) for utilizing each function (the non-contact power transmission function of the coil 11 or the like) of the antenna device 1 (1A to 1D) in the power transmission module 2A. The electronic component 210 included in the functional portion 21 constitutes various electronic components such as various capacitors (capacitor elements), a transistor, a power supply unit, a voltage or current detecting unit, a control IC (Integrated Circuit), and the like. Composition.

The electronic device 3B is, for example, an electronic device (mainly a portable electronic device) including a rechargeable battery (battery) such as a mobile phone or a digital camera, and has one or a plurality of (in this example, one) power receiving module 2B. The power receiving module 2B has a module (a contactless power supply module on the power receiving side) that receives a function (a non-contact power receiving function) of the power Pt transmitted in a non-contact manner by the power transmitting module 2A in the electronic device 3A. The power receiving module 2B includes one or more (one in this example) antenna device 1 (or the antenna devices 1A to 1D according to Modifications 1 to 4). Any one) and a functional portion 22 including one or more electronic components 220. Further, the power receiving module 2B corresponds to a specific example of the "contactless power supply module (first contactless power supply module)" of the present invention.

The functional unit 22 is a portion (circuit portion) for exerting each function (the non-contact power receiving function of the coil 11 or the like) of the antenna device 1 (1A to 1D) in the power receiving module 2B. The electronic component 220 included in the functional portion 22 constitutes various electronic components of such a circuit portion, and is composed of, for example, various capacitors (capacity elements), transistors, rectifying elements, smoothing elements, control ICs, and the like.

[Applicable Example 2]

The contactless power supply system 4A of the application example 2 shown in FIG. 10B includes one or more (in this example, one) electronic device 3A and a plurality of (in this example, two) electronic devices 3B1. 3B2. The contactless power supply system 4A is a system in which the electronic devices 3A, 3B2 can transmit the power Pt in a non-contact manner to the respective electronic devices 3B1, 3B2, for example, by time sharing.

That is, the contactless power supply system 4 of the above-described application example 1 is a so-called "1:1. system (a system in which the power transmission side and the power receiving side are 1:1), and the contactless power supply system 4A of this application example is used. A system of "1:N" (N: an integer of 2 or more) (a system in which the power transmission side and the power receiving side are a 1:N structure).

Each of the electronic devices 3B1 and 3B2 has the same structure as the above-described electronic device 3B, and has one or a plurality of (in this example, one) power receiving module 2B.

[Applicable Examples 3, 4]

The contactless power supply system 4B of the application example 3 shown in FIG. 10C is provided with one or more (in this example) One is an electronic device 3A and one electronic device 303B. The contactless power supply system 4B is a system in which the electronic device 3A can transmit the power Pt to the electronic device 303B in a non-contact manner.

The electronic device 303B has one or more (one in this example) power receiving module 302B. Similarly to the power receiving module 2B, the power receiving module 302B has a function of receiving the power Pt transmitted by the power transmitting module 2A in the electronic device 3A in a non-contact manner (contactless power supply module on the power receiving side). . The power receiving module 302B includes an antenna device 300 of a conventional structure (for example, the antenna device 100 of the above comparative example) and a functional portion 22 including one or a plurality of electronic components 220. In other words, the power receiving module 302B corresponds to the power receiving module 2B, and the antenna device 300 of the conventional structure is provided instead of the antenna device 1 (1A to 1D), and other structures are basically the same as those of the power receiving module 2B.

The contactless power supply system 4C of the application example 4 shown in FIG. 10D includes one or a plurality of (in this example, one) electronic device 303A and one electronic device 3B. The contactless power supply system 4C is a system in which the electronic device 303A can transmit the power Pt to the electronic device 3B in a non-contact manner.

The electronic device 303A has one or more (one in this example) power transmission module 302A. Similarly to the power transmission module 2A, the power transmission module 302A has a module (a contactless power supply module on the power transmission side) that transmits the power Pt in a non-contact manner to the power receiving module 2B in the electronic device 3B. The power supply module 302A includes the antenna device 300 (for example, the antenna device 100) having the above-described conventional structure, and the functional portion 21 including one or a plurality of electronic components 210. That is, the power transmission module 302A corresponds to the power transmission module 2A, and the antenna device 300 of the conventional structure is provided instead of the antenna device 1 (1A to 1D), and other structures are basically the same as those of the power transmission module 2A.

In such a contactless power supply system 4B, 4C, the above-described embodiment may be provided only in one of the contactless power supply module on the power transmitting side and the contactless power supply module on the power receiving side. Antenna device 1 (1A~1D).

As described above, in the contactless power supply systems 4 and 4A to 4C of the application examples 1 to 4, at least one of the contactless power supply module on the power transmitting side and the contactless power supply module on the power receiving side is provided with the above-described embodiment. Antenna device 1 (1A~1D). Therefore, in the system (contactless power supply system) that transmits the power Pt in a non-contact manner, the transmission characteristics of the power Pt can be improved, and the antenna device 1 (1A to 1D) can be made thinner and the reliability can be improved. Further, for example, in the case of the application examples 1, 2, and 4, when the antenna device 1 (1A to 1D) is built in the power receiving module 2B, the coupling coefficient k between the power transmitting modules 2A and 302A can be improved. It can improve the transmission efficiency (power supply efficiency) in the case of contactless power supply.

<4. Other Modifications>

The present invention has been described above by way of several embodiments, modifications, and application examples. However, the present invention is not limited to the embodiments and the like, and various modifications can be made.

For example, the structure (shape, arrangement position, material, and the like) of each component described in the above embodiment is not limited, and other shapes, arrangement positions, materials, and the like may be used. Specifically, the magnetic layer may be disposed so as to overlap at least a part of the coil, and does not necessarily have to overlap the entire area of the coil.

Further, in the above-described embodiment and the like, the shape of the coil is specifically described. However, the shape is not limited to the shape, and any other shape may be used as long as the at least one portion is the curved portion Lb.

Further, in the above-described embodiment and the like, the antenna device, the contactless power supply module, the electronic device, and the contactless power supply system are used as an application example of the coil of the present invention. Although not limited to these, for example, the coil of the present invention may be applied to other devices, modules, and systems (for example, a transmission system that transmits power and signals in a non-contact manner).

Further, in the present invention, the contents described so far can also be applied to any combination.

Priority is claimed on the basis of Japanese Patent Application No. 2015-067506, filed on Jan. 27,,,,,,,,,,,,

The various modifications, combinations, sub-combinations and variations of the invention are intended to be included within the scope of the appended claims.

1‧‧‧Antenna device

11‧‧‧ coil

110‧‧‧Wire

111‧‧‧fusion layer

12‧‧‧Magnetic layer

LLp, LLn‧‧‧ long side

LSp, LSn‧‧‧ short side

Lc‧‧‧ corner

Lb‧‧‧Bend

W1‧‧‧ winding wire

P1‧‧ symbol

Claims (11)

A coil having a winding wire structure, wherein the winding wire structure is formed by winding a winding wire so as to include first and second long side portions facing each other and first and second short side portions facing each other And having a long axis and a short axis, wherein at least one of the first and second long side portions and the first and second short side portions has a curved shape in which the winding wire is curved outward, and has a substantially linear shape. . The coil of claim 1, wherein at least one of the first and second long side portions has the curved shape. The coil of claim 2, wherein both of the first and second long side portions have the curved shape. The coil according to claim 3, wherein the curvature radius of the curved shape of the first and second long side portions is set within a range in which the first and second short side portions are present. The coil of claim 4, wherein the lower limit of the radius of curvature of the curved shape of the first and second long side portions is defined by a limit state in which the first and second short side portions are present . The coil according to any one of claims 3 to 5, wherein the first and second long side portions and the first and second short side portions each have the curved shape. An antenna device comprising: a coil having a first and a second long side portion facing each other and a first and second short side portions facing each other, and having a long axis And short-axis winding wire construction; The magnetic layer is disposed so as to overlap at least a part of the coil, and at least one of the first and second long side portions and the first and second short side portions has a curved shape in which the winding wire is bent outward. In addition to this, it has a substantially straight shape. The antenna device according to claim 7, wherein in the winding wire structure, the winding wire is wound a plurality of times, and the adjacent winding wire and the winding wire and the magnetic layer are fixed to each other. A contactless power supply module including an antenna device and an electronic component, wherein the antenna device includes a coil having first and second long sides including opposite sides, and first and second short sides facing each other a winding wire structure formed by winding a winding wire and having a long axis and a short axis; and a magnetic layer disposed so as to overlap at least a part of the coil, the first and second long side portions and the first At least one of the second short side portions has a curved shape in which the winding wire is bent outward, and has a substantially linear shape. An electronic device comprising a contactless power supply module having an antenna device and an electronic component, wherein the antenna device includes a coil having first and second long side portions facing each other and facing each other a second short-side portion is configured to wind a winding wire and has a long-axis and a short-axis winding wire structure; and a magnetic layer is disposed to overlap at least a part of the coil, and the first and second long sides are And at least one of the first and second short side portions has The curved shape in which the winding wire is bent outward is otherwise substantially linear. A contactless power supply system comprising: a first contactless power supply module; and a second contactless power supply module, wherein the first contactless power supply module transmits power in a non-contact manner, the first and second non- The contact power supply module includes an antenna device and an electronic component, and the antenna device of at least one of the first and second contactless power supply modules includes: a coil having first and second long side portions including opposite sides a winding wire structure having a long axis and a short axis formed by winding a winding wire with the first and second short side portions facing each other; and the magnetic layer is disposed so as to overlap at least a part of the coil; At least one of the first and second long side portions and the first and second short side portions has a curved shape in which the winding wire is bent outward, and has a substantially linear shape.