JPH09285042A - Contactless power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactless power supply with good magnetic coupling of electromagnetic induction on primary and secondary sides in a magnetic circuit. SOLUTION: In a contactless power supply, a primary core 10 and a secondary core 20 are stored opposite in independent non-permeability cases 1 and 2. These cases 1 and 2 are put near to each other to make electromagnetic induction coupling on the primary and secondary sides in the magnetic circuit. Each top part 10a or 20a of the primary and secondary cores 10 and 20 are passed through the wall of cases 1 and 2 in a way that the top end of each core 10 or 20 is made flash with the face of the case 1 or 2. When the end face of the secondary core 20 is put opposite to the end face of the primary core 10, an air gap (lg) is made smaller than a conventional one by the thickness of the cases 1 and 2. Then, the magnetic coupling of electromagnetic induction on the primary and secondary sides is made stronger, and an output larger than the conventional one can be taken out.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a non-contact power supply device,
Particularly, the present invention relates to a non-contact power supply device in which the primary side and the secondary side of the magnetic circuit are housed in independent cases and the primary side and the secondary side of the magnetic circuit are electromagnetically inductively coupled by bringing the cases close to each other. Is.

[0002]

2. Description of the Related Art Conventionally, in a battery charger used in, for example, a video camera, the primary side and the secondary side of the magnetic circuit are housed in separate cases, and the two cases are brought close to each other to close the magnetic circuit. There is one that is configured by a non-contact power supply device in which the primary side and the secondary side are electromagnetically inductively coupled.

FIG. 17 shows an example of such a conventional non-contact power supply device. In the figure, the core of the transformer constituting the magnetic circuit of the charging device is separated into a primary core 10 and a secondary core 20 and housed in independent cases 1 and 2, respectively. The primary side and the secondary side of the magnetic circuit are configured to be electromagnetically inductively coupled by causing the end faces of the primary side core 10 and the secondary side core 20 to face each other by bringing 1 and 2 close to each other.

Then, in the case 1, the primary core 1
When the primary-side charging circuit 12 connected to the coil 11 of 0 is energized by the AC power source, a voltage is induced in the coil 21 wound around the secondary-side core 20 in the case 2, and thereby the secondary connected to the coil 21. The side charging circuit 22 is energized.

[0005]

However, in such a conventional non-contact power supply device, the cores 10 and 20 of the primary and secondary coils are arranged inside the cases 1 and 2, respectively. Primary side core 1 through the thickness of case 2
0 and the end faces of the secondary side core 20 face each other, so the air gap lg (length) is inevitable.
of air gap) becomes large. Therefore, the degree of electromagnetic induction coupling between the primary side and the secondary side of the magnetic circuit is poor, and the energy transfer loss is large, so it is not possible to extract a large output power from the secondary side charging circuit 22.
Alternatively, there is a problem that the device becomes large in size in order to take out a large output power.

Therefore, an object of the present invention is to provide a non-contact power supply device in which the degree of electromagnetic induction coupling between the primary side and the secondary side of a magnetic circuit is enhanced. Another object of the present invention is to provide a non-contact power supply device in which the degree of electromagnetic induction coupling between the primary side core and the secondary side core of the magnetic circuit is enhanced while considering the material brittleness of the magnetic core material. Especially.

[0007]

In order to solve the above problems, the present invention is configured as follows. (1) The invention of claim 1 comprises a core forming a magnetic circuit,
The primary side core and the secondary side core are separated and housed in mutually independent non-permeable cases so that they face each other, and the primary side and the secondary side of the magnetic circuit are electromagnetically inductively coupled by bringing both cases close to each other. In the non-contact power supply device described above, the tip portions of the primary side core and the secondary side core are provided so as to penetrate through the wall thickness of the case and the tip surfaces thereof match the surface of the case.

According to the invention of claim 1 having such a structure, when the end surface of the secondary side core is opposed to the end surface of the primary side core, the air gap between both cores is smaller than that of the conventional example. By reducing the thickness, the electromagnetic induction coupling between the primary side and the secondary side of the magnetic circuit becomes stronger than before. Therefore, it is possible to take out a larger output than the conventional one.

(2) According to the invention of claim 2, in the contactless power supply device of the same premise as above, at the position facing the end faces of the primary side core and the secondary side core, the thick part of the case is thickened. A magnetic circuit formation assisting member made of an elastic and magnetically permeable material is embedded in such a manner as to penetrate through. The core, which is hard and brittle in terms of material, is not exposed on the surface of the case, and is covered with a magnetic circuit forming auxiliary member made of an elastic and magnetically permeable material, so that the core is protected from impact.

Such magnetic circuit formation assisting members include, for example, solidified powder of rubber material and core material (magnetic material), plastic material of powdered core material (magnetic material), and plastic material. It is possible to use a mixture obtained by mixing and powdering a mixture of the above and a mixture of powdered core material (magnetic material) and a mixture of powdered rubber or plastic material.

(3) According to a third aspect of the present invention, in the contactless power supply device of the same premise as described above, the magnetic material is placed within the thickness of the case at a position facing the end faces of the primary core and the secondary core. A magnetic circuit forming auxiliary member made of an elastic and magnetically permeable material was provided within the wall thickness of the case so as to be buried up to near the outer surface of the case and cover at least the outer surface side of the case of the magnetic material of the buried portion. It is a thing.

According to this structure, the position of the front end surface of the core substantially approaches the position of the end surface of the magnetic material, that is, the position inside the thickness of the case, so that the electromagnetic coupling efficiency is also increased from this point. Moreover, since the brittle magnetic material is covered with the magnetic circuit forming auxiliary member made of an elastic material, the magnetic material is prevented from being exposed and chipped.

(4) In the non-contact power supply device according to claim 2 or 3, the magnetic resistance is increased by increasing the contact area of the coupling portion between the magnetic circuit formation assisting member and the core (claim 4). Can be reduced.

(5) According to a fifth aspect of the present invention, in the contactless power supply device of the same premise as above, at a position facing the end faces of the primary core and the secondary core, the wall thickness of the case is bypassed. The magnetic circuit formation assisting member is provided. Even in such a configuration, the magnetic coupling degree of electromagnetic induction between the primary side core and the secondary side core of the magnetic circuit can be increased while considering the material brittleness of the magnetic core material.

(6) The invention according to claim 6 is the above-mentioned claim 2,
In the non-contact power supply device according to 3, 4, or 5, an intermediate material is provided between the magnetic circuit formation auxiliary member and the case, and a material having a temperature coefficient close to that of the case is used as the intermediate material. In any of the magnetic circuit formation assisting members, such as a type that penetrates the thickness of the case or a type that bypasses the thickness of the case, the intermediate material between the case and the case has a temperature coefficient close to the material of the case in contact with it. Therefore, damage due to temperature change is prevented.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a contactless power supply device of the present invention, and the basic configuration and function are similar to those of the conventional charging device of FIG. That is, in this charging device, the ferrite core that constitutes the magnetic circuit is separated into the U-shaped primary side core 10 and the secondary side core 20, and the plastic non-magnetic case 1 and the plastic non-permeable case 1, which are independent of each other, are provided. It is housed in 2 in the form of facing each other.
Then, in the primary side case 1 of this charging device, a primary side charging circuit 12 energized by an AC power source is connected to the coil 11 of the primary side core 10, and in the secondary side case 2 of the charging device. The secondary charging circuit 22 is connected to the coil 21 of the secondary core 20.

However, unlike the conventional case of FIG.
The primary side core 10 and the secondary side core 20 are connected to the tip portions 10a, 20.
a penetrates the wall thicknesses of the cases 1 and 2, respectively, and the tip end surfaces thereof are flush with the surfaces of the cases 1 and 2. Therefore, when the secondary case 2 is set in the device, that is, when the secondary case 2 is brought close to the secondary case 2,
When the end surface of 0 is opposed to the end surface of the primary core 10, the air gap lg between the cores 10 and 20 is smaller than that in the case of FIG. 17 by the thickness of the cases 1 and 2. , The electromagnetic induction coupling between the primary side and the secondary side of the magnetic circuit becomes stronger than before. Therefore, the coil 11 of the primary core 10
When the primary side charging circuit 12 connected to is powered by an AC power source, a larger output than before can be taken out from the secondary side charging circuit 22 connected to the coil 21 of the secondary side core 20.

FIG. 2 shows a second embodiment of the present invention. Usually, the cores 10 and 20 are hard and brittle in terms of material, so when the core penetrating type shown in FIG. 1 is used, the tip surface of the core may be chipped during use. From this, in order to prevent this, at the positions facing the tip surfaces of the primary side core 10 and the secondary side core 20, the wall thickness portions of the cases 1 and 2 penetrate through the wall thickness and the elasticity is increased. A magnetic circuit forming auxiliary member 30 made of a magnetically permeable material is embedded.

The magnetic circuit formation assisting member 30 is composed of a so-called mold core, which is obtained by hardening a rubber material and a magnetic material into powder. The magnetic circuit formation assisting member 30 is obtained by mixing and hardening a powder of a core material (magnetic material) and a powder of a plastic material, or a powder of the core material (magnetic material). It is also possible to use a mixture of rubber and a powder of rubber or a plastic material and solidification.

Cores 10, 20 shown in FIGS. 3 (a) and 3 (b)
The shape and area of the end surface of the magnetic circuit formation assisting member 30 can be set to be substantially the same as the shape and area S ₀ of the end surfaces 10a and 20a. That is, FIG.
The end face 30a shown in (c) has the same shape and has substantially the same area S1, or the end face 30c shown in FIG. 3 (d) has different shapes and the same area S2, or FIG. As shown in the end face 30c, a plurality (here, 2
It is possible to make the area S3 in which the total is substantially equal in the divided shape divided into the end face 30c.

The cross-sectional shape of the magnetic circuit formation assisting member 30 in the thickness direction of the case is not only rectangular as shown in FIG. 2 but also V-shaped as shown in FIG. 4 or as shown in FIG. The diameter of the case 1 may be different on the front surface side and the back surface side of the case 1, and the case 1 may have a columnar shape with a step.

Further, as shown in FIG.
It is also possible to provide the magnetic circuit formation assisting member 30 only on the outer surface side of the case inside each of the thicknesses. That is, a brittle magnetic material 40 having a high magnetic permeability is embedded in the thick portions of the cases 1 and 2 so as to penetrate the thickness from the inner surface side to the outer surface side of the case, and the elastic force is applied to the side contacting the outer surface of the case. A magnetic circuit forming auxiliary member 30 made of a magnetically permeable material may be provided to cover the magnetic material 40.

As described above, the thick portions of the cases 1 and 2 have elasticity such that the thickness penetrates from the case inner surface side to the outer surface side or through the magnetic material 40 to the case outer surface side. By disposing the magnetic circuit forming auxiliary member 30 made of a magnetically permeable material, the primary core 10 and the secondary core 2 are provided.
0 and the magnetic material 40 are not exposed from the case, it is possible to prevent an accident such as chipping due to an impact from the outside, and moreover, the primary core 10 and the secondary core 20 themselves having high magnetic permeability, or the magnetic material 40. , 40 approach each other, the magnetic resistance between them becomes smaller, and efficient energy transfer is possible.

The magnetic circuit formation assisting member 30 as shown in FIGS. 2 to 6 is generally attached by insert molding, but as shown in FIG. 5, it may be attached by press fitting. Of course, other than that, it can be attached by means such as adhesion or screwing. Further, as much as possible, a material having a temperature coefficient close to that of the material of the case 1 or the case 2 is selected as the material of the magnetic circuit formation assisting member 30. This is because if the temperature coefficients are too different, there is a risk of breakage due to temperature changes.

FIG. 7 shows a third embodiment of the present invention. This is the magnetic circuit formation assisting member 30 and the core 10,
The contact area of the connecting portion with 20 is made large. That is, in this example, the magnetic circuit formation assisting member 30 is used.
Is a case penetrating portion 3 that penetrates the thick portions of the cases 1 and 2.
3 has a bulging portion 34 that bulges in a wider area on both sides of the case than the case penetrating portion 33, and the whole cross section of the case penetrating portion 33 and the bulging portion 34 is It is configured to have a letter shape. And core 1
The end faces of 0 and 20 are also expanded to have an equivalent area corresponding to the bulging portion 34. Note that lg1, lga, and lg2 represent air gaps.

Since the cross-sectional area of the magnetic path is increased by such a structure, the magnetic resistance is reduced and the magnetic coupling efficiency between the primary side and the secondary side can be increased. In addition, as shown in FIG. 8, one of the joining surfaces of the core material of the primary and secondary cores 10 and 20 and the magnetic circuit formation assisting member 30 is formed as a convex portion, and the other is formed as a concave portion, which are fitted to each other. By forming a concavo-convex structure that matches, the magnetic coupling efficiency can be further improved.

FIG. 9 shows a modification of the embodiment in which the contact area of the coupling portion between the cores 10 and 20 and the magnetic circuit formation assisting member 30 is increased, and a magnetic material 40 having a high magnetic permeability and being brittle.
Is formed in a U-shaped cross section, and the shoe portion 41 is put on the end portions of the cores 10 and 20, thereby expanding the contact area of the end surfaces of the cores 10 and 20. On the other hand, the magnetic material 40 of the shoe portion 41 is embedded in the thickness of the cases 1 and 2 up to the vicinity of the outer surface of the case, and the magnetic material 40 in the thickness of the cases 1 and 2 is covered so as to cover the surface of the magnetic material 40 in the embedded portion. A magnetic circuit forming auxiliary member 30 made of a magnetically permeable material having elasticity is provided.

Since the magnetic materials 40 having a larger cross-sectional area than the cores 10 and 20 and a high magnetic permeability face each other with the thin magnetic circuit forming auxiliary member 30 having a thickness less than or equal to that of the case sandwiched therebetween, electromagnetic coupling is achieved as compared with the structure shown in FIG. As efficiency increases, core 10,
Since the end face position of 20 substantially approaches the end face position of the magnetic material 40, that is, the position inside the thickness of the case, the electromagnetic coupling efficiency also increases from this point. Moreover, since the brittle magnetic material 40 is covered with the magnetic circuit formation assisting member 30 made of an elastic material, the magnetic material 40 is prevented from being exposed and chipped. If it is desired to further increase the area of the facing surface of the core, the collar portion 42 may be further formed on the magnetic material 40 as shown in FIG.

FIG. 11 shows a fourth embodiment of the present invention. This is the case where the magnetic circuit formation assisting member 30 is provided so as to bypass the thickness of the cases 1 and 2 as described above, but to bypass the thickness of the cases 1 and 2. That is,
In this embodiment, the magnetic circuit formation assisting member 30 is formed as a U-shaped member 35 as shown in FIG. 12 (b), and the leg portions 35b and 35c extending from both sides of the base portion 35a in the shape of both legs. Is equal to the wall thickness of the case 1 or the case 2, and the case 1 is placed between the leg portions 35b and 35c.
Alternatively, the edge of the case 2 is fitted. 11 and 12
In the example shown in (a), the front side case 2a and the back side case 2b
In case 2 consisting of
The leg portions 35b and 35c are fitted in the edge portions of the U-shaped member 35, and the U-shaped member 35 is sandwiched between the edge portions of the front side case 2a and the back side case 2b.

13 and 14 show a fifth embodiment of the present invention. In this embodiment, the case 1 as described above is
The intermediate material 37 between the magnetic circuit formation assisting member 30 penetrating the thickness of 2 or the magnetic circuit formation assisting member 30 bypassing the thickness of the cases 1 and 2 and the cases 1 and 2.
It has a two-layer structure. That is, the intermediate material 3
7, a material having a temperature coefficient close to that of the material of the case 1 or 2 in contact with this is used to prevent damage due to temperature change. On the side opposite to the case of the intermediate material 37, the magnetic circuit formation assisting member 30 which is the one described in the second embodiment (FIG. 2), for example, which is obtained by solidifying a powder of a rubber material and a magnetic material. Set up.

FIG. 15 shows a sixth embodiment of the present invention. This is one in which the bulging portion 34 on the case surface side of the magnetic circuit formation assisting member 30 of FIG. 7 is omitted. Therefore, although the facing area between the magnetic circuit formation assisting member 30 of the case 1 and the magnetic circuit formation assisting member 30 of the case 2 becomes small, the protective action of the cores 10 and 20 and the reduction of the air gap of the magnetic path are reduced as in FIG. Can be achieved.

FIG. 16 shows a seventh embodiment of the present invention. This is so that the magnetic coupling surface between the core 20 of the case 2 on the secondary side of the charging device and the core 10 of the case 1 on the primary side of the power source is in a direction orthogonal to the magnetic coupling surface in the case of the above embodiment. The members are arranged, and for that purpose, the primary case 1 is formed in a U shape and arranged so as to be fitted to the end of the secondary case 2.

The magnetic circuit formation assisting member 30 and the like in the thick portions of the cases 1 and 2 with respect to the cores 10 and 20 can be configured in the same manner as described above. The advantage of the configuration of FIG. 16 is that, even if a product such as a mobile phone is dropped by mistake, the core 2
Since 0 is located on the side of the case 2 and is less likely to receive a shock due to a collision with the core 10, it is advantageous for a drop shock.

[0034]

As described above, according to the present invention, the following excellent effects can be obtained. (1) According to the invention of claim 1, the tip ends of the primary side core and the secondary side core are provided so as to penetrate the wall thickness of the case and the tip end surfaces thereof coincide with the surface of the case. , When the tips of the primary and secondary cores face each other, the air gap between both cores is reduced by the thickness of the case, and the electromagnetic force between the primary and secondary sides of the magnetic circuit is reduced. The inductive coupling is stronger than before, and a larger output than before can be taken out.

(2) According to the second aspect of the invention, since the magnetic circuit forming auxiliary member made of the elastic and magnetically permeable material is embedded in the thick portion of the case so as to penetrate through the thick portion,
The electromagnetic induction coupling between the primary side and the secondary side of the magnetic circuit is stronger than before, and it is possible to take out a larger output than before, and the core that is hard and brittle in material is made of elastic and magnetically permeable material. Covered with a magnetic circuit forming auxiliary member
Since the core is protected from impact, a contactless power supply device having a structure excellent in vibration resistance or impact resistance can be obtained. Further, since the magnetic circuit forming auxiliary member is provided in this way to reduce the magnetic resistance, improve the energy transfer efficiency, and stabilize the output, the same energy can be transferred even if the contactless power supply device is downsized.

(3) According to the third aspect of the invention, the end face position of the core substantially approaches the end face position of the magnetic material, that is, the position inside the thickness of the case, so that the electromagnetic coupling efficiency also increases from this point. Moreover, since the brittle magnetic material is covered with the magnetic circuit forming auxiliary member made of an elastic material, the magnetic material is prevented from being exposed and chipped.

(4) According to the invention of claim 4, since the contact area of the coupling portion between the magnetic circuit formation assisting member and the core is configured to be large, the magnetic resistance is reduced and the energy transfer efficiency is improved. You can

(5) According to the invention of claim 5, since the magnetic circuit formation assisting member is provided in a manner of bypassing the wall thickness of the case, the brittleness of the magnetic core material is also in this configuration. In consideration of the above, the magnetic coupling efficiency of electromagnetic induction between the primary side core and the secondary side core of the magnetic circuit can be improved.

(6) According to the invention of claim 6, in any of the magnetic circuit formation assisting members that penetrate the thickness of the case or bypass the thickness of the case Since the intermediate material has a temperature coefficient close to that of the material of the case in contact with it, damage due to the temperature change is prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a non-contact power supply device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a non-contact power supply device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a core end surface 10a (20a) and end surfaces 30a, 30b, 30c of a magnetic circuit formation assisting member 30 in a contactless power supply device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a first modification of a magnetic circuit formation assisting member 30 in the contactless power supply device according to the second embodiment of the present invention.

FIG. 5 is a diagram showing a second modified example of the magnetic circuit formation assisting member 30 in the contactless power supply device according to the second embodiment of the present invention.

FIG. 6 is a diagram showing a third modified example of the magnetic circuit formation auxiliary member 30 in the contactless power supply device according to the second embodiment of the present invention.

FIG. 7 is a diagram showing a non-contact power supply device according to a third embodiment of the present invention.

FIG. 8 is a view showing a combination of a core end face and an end face of a magnetic circuit formation assisting member in a contactless power supply device according to a third embodiment of the present invention.

FIG. 9 is a diagram showing a first modification example of the contactless power supply device according to the third embodiment of the present invention.

FIG. 10 is a diagram showing a second modification of the non-contact power supply device according to the third embodiment of the present invention.

FIG. 11 is a diagram showing a non-contact power supply device according to a fourth embodiment of the present invention.

FIG. 12 is a diagram showing a magnetic circuit formation assisting member of the non-contact power supply device according to the fourth embodiment of FIG. 11 and a mounting state thereof.

FIG. 13 is a diagram showing an example of a non-contact power supply device according to a fifth embodiment of the present invention.

FIG. 14 is a diagram showing another example of the non-contact power supply device according to the fifth embodiment of the present invention.

FIG. 15 is a diagram showing a non-contact power supply device according to a sixth embodiment of the present invention.

FIG. 16 is a diagram showing a non-contact power supply device according to a seventh embodiment of the present invention.

FIG. 17 is a diagram showing an example of a conventional non-contact power supply device.

[Explanation of symbols]

1 ... Primary side case, 2 ... Secondary side case, 10 ... Primary side core, 10a ... Tip part, 11 ... Coil, 12 ...
Primary side charging circuit, 20 ... Secondary side core, 20a ... Tip part, 21 ... Coil, 22 ... Secondary side charging circuit, 30 ...
... Magnetic circuit formation assisting members, 30a, 30b, 30c ...
End face, 33 ... Case penetrating part, 34 ... Swelling part, 35 ...
... U-shaped member, 35a ... Base, 35b, 35c ...
Legs, 37 ... Intermediate material, 40 ... Magnetic material, 41 ...
Shoe part, 42 ... Collar part, lg, lg1, lg2, lga ...
... Air gap, S ₀ ... Area of core end surface, S1 to S
3 ... Area of end surface of magnetic circuit formation auxiliary member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Yamazaki 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (6)

[Claims] 1. A core forming a magnetic circuit is separated into a primary side core and a secondary side core, and the cores are housed in separate non-permeable cases facing each other. In a non-contact power supply device in which the primary side and the secondary side of the circuit are electromagnetically inductively coupled, in the tip parts of the primary side core and the secondary side core, the front end surface penetrates the wall thickness of the case and the front end surface is the surface of the case. A non-contact power supply device, which is provided so as to match with. 2. A core forming a magnetic circuit is divided into a primary side core and a secondary side core, and the cores are housed in mutually independent non-permeable cases so as to face each other. In a non-contact power supply device in which the primary side and the secondary side of the circuit are electromagnetically inductively coupled, in a position facing the end faces of the primary side core and the secondary side core, the wall thickness portion of the case is penetrated through the thickness side. The non-contact power supply device is characterized in that a magnetic circuit formation auxiliary member made of a magnetically permeable material is embedded. 3. A core forming a magnetic circuit is separated into a primary side core and a secondary side core, and the cores are housed in independent non-permeable cases so as to face each other. In a contactless power supply device in which the primary side and the secondary side of the circuit are electromagnetically inductively coupled, at a position facing the end faces of the primary side core and the secondary side core, a magnetic material is placed inside the thickness of the case up to the vicinity of the case outer surface. It is embedded, and a magnetic circuit forming auxiliary member made of an elastic magnetically permeable material is provided within the thickness of the case so as to cover at least the outer surface side of the magnetic material of the embedded portion. Non-contact power supply device. 4. The contactless power supply device according to claim 2, wherein the contact area of the coupling portion between the magnetic circuit formation assisting member and the core is large. 5. A core forming a magnetic circuit is separated into a primary side core and a secondary side core, and the cores are housed in independent non-magnetic cases in a manner to face each other. In a contactless power supply device in which the primary side and the secondary side of the circuit are electromagnetically inductively coupled, in the position facing the end faces of the primary side core and the secondary side core, the magnetic circuit is formed in a manner bypassing the wall thickness of the case. A non-contact power supply device comprising a formation assisting member. 6. An intermediate material is provided between the magnetic circuit formation assisting member and the case, and an intermediate material having a temperature coefficient close to that of the case is used as the intermediate material.
The non-contact power supply device according to 3, 4, or 5.