JP2000124032A - Film composed of amorphous metal foils and insulating resin layer, and coil or transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve electro magnetic characteristics of a coil or a transformer and eliminate the leakage of an electro-magnetic field, by providing a film composed of amorphous soft magnetic metal foils, having magnetic distortion of not more than a specific value and volume resistance ratio of more than a specific value. SOLUTION: Amorphous soft magnetic metal leafs 1 composing a film are made of a ferroalloy, containing at least one kind element selected from among a group including B, Si, Co, Ni, and Mo. The magnetic distortion of the amorphous soft magnetic metal foils 1 are to be less than approximately 5 ppm, and the volume resistance ratio is to be more than approximately 100 uΩ.cm. Insulating resin layers 2, 3 are formed on both sides of the amorphous soft magnetic metal foils 1 to make a film. The film is properly cut to meet the size of E-type core 4 which is a part of magnetic core constituting a coil or a transformer. Then, the film is adhered on an end 6 of the E-type core 4. As a result, electromagnetic characteristics such as Q-factor of the coil or the transformer, and the effective permeability can be improved drastically and leakage of an electro-magnetic field can be restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film comprising an amorphous metal foil and an insulating resin layer.
The present invention relates to a film used for a method for improving the electromagnetic characteristics of a coil or a transformer and suppressing electromagnetic field leakage, a coil or a transformer provided with the film, and a method for improving the electromagnetic characteristics of the coil or the transformer and suppressing the electromagnetic field leakage. The present invention also relates to a film comprising a soft magnetic metal foil and an insulating resin layer, and more particularly, to a method for suppressing magnetic flux leakage of a housing in which a coil or a transformer is installed, and installing the film. And a coil or a transformer.

[0002]

2. Description of the Related Art A coil and a transformer are one of important components of electronic equipment and electric appliances as components having inductance. In recent years, electronic devices such as mobile phones, PHSs, and portable computers have tended to be miniaturized.
There is also a demand for miniaturization of the coils and transformers used for them.

[0003] The size and performance of coils and transformers are determined by the magnetic core (core) used for them. When a material having a large effective magnetic permeability is used as the magnetic core material, the self-inductance and the mutual inductance of the coil and the transformer can be increased, and the size of the component can be reduced. In a coil or a transformer, the loss amount represented by the Q value of the inductance is a parameter directly related to the energy efficiency of the coil or the transformer, and the larger the Q value, that is, the smaller the loss amount, the better. It is assumed that.

[0004] As a core material of a coil or a transformer, a silicon steel plate or a ferrite sintered body has been conventionally used. Generally, a metal material such as a silicon steel sheet has high conductivity, and if it is placed in a changing magnetic flux, an eddy current is generated and heat is generated, so-called eddy current loss occurs. The eddy current loss was prevented by using a magnetic core having a structure in which a number of plates were stacked. However, since a silicon steel sheet has a disadvantage that loss increases in a high frequency band, a ferrite sintered body which is a metal oxide material has been used in a high frequency band.

[0005] However, the ferrite sintered body has a drawback that it is not easy to process into a desired shape and the flexibility is poor. Therefore, it has been proposed to use a composite material in which ferrite particles are dispersed in a resin. This is a flexible and relatively low loss material,
However, because of its low magnetic permeability, it was not satisfactory as a material for the magnetic core.

On the other hand, the magnetic core of a coil or a transformer often forms a single magnetic core by connecting a plurality of portions, for example, an E-type core and an I-type core. In this case, the presence of only a small gap is comparable to a severely cut magnetic circuit. This deteriorates the magnetic characteristics of the magnetic core and causes leakage of the magnetic field, thereby causing unnecessary electromagnetic field leakage.

[0007] In recent years, amorphous alloys have attracted attention as magnetic materials and high toughness materials. This amorphous alloy, unlike ordinary alloys, does not have a crystal structure,
Compared to other crystalline alloys, it has advantages such as high magnetic permeability, small iron loss, and control of magnetostriction in a wide range, etc., in the power transformer core field, electronic device magnetic material field, etc. Its use is drawing attention.

However, an amorphous alloy is very expensive, and there is a problem in that the cost is disadvantageous if the magnetic core is made of only the amorphous alloy. In addition, there are various types of electrical products provided with a coil or a transformer, but there is a concern that a magnetic flux leaking from such electrical products may adversely affect a human body.

[0009]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a coil and a transformer that can freely and easily set the inductance of the coil and the transformer over a wide range by installing the coil or the transformer. The loss is small and the effective magnetic permeability can be increased,
An object of the present invention is to provide a film capable of suppressing electromagnetic field leakage, a coil or a transformer using the film, and a method of improving electromagnetic characteristics of the coil or the transformer and suppressing electromagnetic field leakage. The present invention also provides an inexpensive and easy-to-use film, coil, and housing in which a coil and a transformer are provided by being installed in a housing in which the coil and the transformer are installed. Another object of the present invention is to provide a method for suppressing magnetic flux leakage, and a housing and a coil or a transformer on which the above-mentioned film is installed.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to a film which is installed on a part of a magnetic core constituting a coil or a transformer and is used for improving electromagnetic characteristics of the coil or the transformer and for suppressing electromagnetic field leakage. The film includes an amorphous metal foil and an insulating resin layer, and the amorphous metal foil contains at least one element selected from the group consisting of B, Si, Co, Ni, and Mo. Having a magnetostriction of 5 ppm or less and a volume resistivity of 100 μm.
It is a film that is an amorphous soft magnetic metal foil having a resistance of Ω · cm or more. Also, the present invention relates to B, Si, Co, Ni and M
an iron-based alloy containing at least one element selected from the group consisting of: o, having a magnetostriction of 5 ppm or less;
An amorphous soft magnetic metal foil having a volume resistivity of 100 μΩ · cm or more, and a film made of an insulating resin layer provided on at least one surface of the amorphous soft magnetic metal foil are installed as a part of a magnetic core. Coil or transformer. Further, according to the present invention, a part of a magnetic core constituting a coil or a transformer is made of an iron-based alloy containing at least one element selected from the group consisting of B, Si, Co, Ni, and Mo, and has a magnetostriction. 5 ppm or less, and the volume resistivity is 100
Improve the electromagnetic characteristics and electromagnetic properties of a coil or transformer in which an amorphous soft magnetic metal foil having a resistance of μΩcm or more, and a film comprising an insulating resin layer provided on at least one surface of the amorphous soft magnetic metal foil are installed. This is a method of suppressing field leakage.

Further, the present invention is directed to a film which is installed in a housing in which a coil or a transformer is installed and used for suppressing magnetic flux leakage, wherein the film comprises a soft magnetic metal foil and an insulating material. The soft magnetic metal foil, which is made of a resin layer, is also a film made of an iron-based alloy containing at least one element selected from the group consisting of B, Si, Co, Ni, and Mo. Further, the present invention relates to a method in which a B, Si, C
o, a soft magnetic metal foil made of an iron-based alloy containing at least one element selected from the group consisting of Ni and Mo,
In addition, this is a method of suppressing magnetic flux leakage by installing a film made of an insulating resin layer provided on at least one surface of the soft magnetic metal foil.

Further, the present invention provides a soft magnetic metal foil made of an iron-based alloy containing at least one element selected from the group consisting of B, Si, Co, Ni and Mo, and the above soft magnetic metal foil The present invention also provides a coil or transformer in which a film made of an insulating resin layer provided on at least one surface of the above is installed as at least part of a magnetic core. Hereinafter, the present invention will be described in detail.

In the present invention, B, Si, Co, Ni
And an amorphous soft magnetic metal foil having at least one element selected from the group consisting of Mo and Mo, having a magnetostriction of 5 ppm or less and a volume resistivity of 100 μΩ · cm or more; A film consisting of a resin layer
By installing it in a part of the magnetic core constituting the coil or transformer, the inductance of the coil or transformer can be easily set in a wide range, improving the electromagnetic characteristics,
Electromagnetic field leakage can be suppressed.

[0014] In the present invention, B, Si, C may be provided in a housing in which a coil or a transformer is installed.
o, a soft magnetic metal foil made of an iron-based alloy containing at least one element selected from the group consisting of Ni and Mo,
In addition, by providing a film made of an insulating resin layer provided on at least one surface of the soft magnetic metal foil, it is possible to suppress magnetic flux leakage.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The film of the present invention is used for a method of improving the electromagnetic characteristics of a coil or a transformer and suppressing electromagnetic field leakage by installing the film on a part of a magnetic core constituting a coil or a transformer. The above-mentioned coil or transformer has a magnetic core, but does not prevent use in an air-core coil.

The amorphous metal foil is made of B, Si, Co, N
An amorphous soft magnetic metal foil made of an iron-based alloy containing at least one element selected from the group consisting of i and Mo.

The amorphous soft magnetic metal foil has a magnetostriction of 5 pp.
m or less. The above-mentioned magnetostriction is distortion of a magnetic material generated when magnetized. When the magnetostriction exceeds 5 ppm, the vibration of the metal foil increases, and a phenomenon occurs in which the interval between the metal foil and the magnetic core vibrates, which adversely affects the electromagnetic characteristics such as the Q value and the effective magnetic permeability. Limited. Preferably, it is 1 ppm or less.

The amorphous soft magnetic metal foil has a volume resistivity of 100 μΩ · cm or more. If it is less than 100 μΩ · cm, the eddy current loss increases, and the effective magnetic permeability decreases. Preferably, 120
μΩ · cm or more.

As the amorphous soft magnetic metal foil, a commercially available foil can be used. Specifically, for example, METGLAS 2705M (Co-Fe-Ni
-Mo-B-Si system, magnetostriction 1 ppm or less, volume resistivity 1
36 μΩ · cm, manufactured by Nippon Amorphous Metals), METGLA
S2714A (Co-Fe-Ni-B-Si system, magnetostriction 1 ppm or less, volume resistivity 142 µΩ · cm, manufactured by Nippon Amorphous Metals Co., Ltd.).

In the film of the present invention, as shown in FIG. 1 (a), insulating resin layers 2 and 3 are formed on one or both surfaces of the above-mentioned amorphous soft magnetic metal foil 1. The insulating resin layer is formed of, for example, an insulating resin or film. The insulating resin or film may be an adhesive resin or film or a resin or film for the purpose of adhesion.

As shown in FIG. 1 (b), insulating resin layers 2 are sandwiched between a plurality of amorphous soft magnetic metal foils 1 and insulating resin layers 2 and 3 are formed on both surfaces thereof. It may be something. Further, as shown in FIG. 1 (c), a plurality of amorphous soft magnetic metal foils 1 are stacked, and an insulating resin layer 2,
3 may be formed. Thus, when a plurality of amorphous soft magnetic metal foils are used, for example, the amorphous soft magnetic metal There is an advantage that the performance deterioration of the film of the present invention due to the deterioration of the foil properties can be suppressed as compared with the case where a single amorphous soft magnetic metal foil is used.
For this purpose, it is natural that a plurality of films shown in FIG.

The insulating resin or film is not particularly restricted but includes, for example, polypropylene, polyethylene, polyamide, polyurethane, polyvinyl alcohol, polybutadiene, polybutene, silicone resin;
Vinyl chloride resins such as plasticized polyvinyl chloride, polyurethane-based plasticized polyvinyl chloride, and plasticized (vinyl acetate-vinyl chloride copolymer); alkyl (meth) acrylate, polyester, polyethylene terephthalate, and other base polymers And a film made of the resin.

The adhesive resin is not particularly restricted but includes, for example, rubber-based adhesives such as styrene-isoprene-styrene block copolymer, styrene-butadiene rubber, polybutene, polyisoprene, butyl rubber and natural rubber; Acrylic adhesives such as alkyl (meth) acrylates such as ethyl (meth) acrylate and propyl (meth) acrylate; wax-based adhesives that can be used as hot melts; silicone-based adhesives; urethane-based adhesives An epoxy adhesive.

As shown in FIG. 1, the insulating resin layer
It can be provided on one surface of the amorphous metal foil, or can be provided on both surfaces. When provided on both surfaces, the resin layer provided on one surface is a surface protection layer provided for the purpose of rust prevention, abrasion prevention, adhesion, electrical insulation, etc., and the resin layer provided on the other surface is provided on the other surface. The support layer is in contact with the target magnetic core. By forming at least one of the surface protective layer and the support layer with an adhesive resin, the film of the present invention can be easily installed on the magnetic core of a coil or a transformer. When a resin layer is provided on one surface of the amorphous metal foil, the resin layer can function as a surface protective layer or can also function as a support layer, depending on the method of setting the film.

The thickness of each of the surface protective layer and the support layer is preferably 5 to 600 μm. 5μ
If it is less than m, insulation or rust prevention may be insufficient, or abrasion resistance may be insufficient.Also, even if it is made of an adhesive resin, adhesion may be insufficient. is there. If it exceeds 600 μm, the effect of improving the electromagnetic characteristics of the coil or the transformer cannot be sufficiently obtained.

The surface protective layer and the support layer are coated on the amorphous soft magnetic metal foil by, for example, applying the resin having an insulating property to the amorphous soft magnetic metal foil, and drying and curing the resin. Can be laminated. When a film is used as the surface protective layer and the support layer, for example, the film is laminated on the amorphous soft magnetic metal foil by bonding it to the amorphous soft magnetic metal foil using an adhesive or the like. can do. When the adhesive resin is of a hot melt type, it may be heated and welded.

Since the film of the present invention is composed of the above-mentioned amorphous metal foil and the above-mentioned insulating resin layer, it has excellent flexibility and flexibility, and can be easily cut. It can be easily molded.

The film of the present invention is, as shown in FIG.
It is used by installing it on a part of a magnetic core constituting a coil or a transformer. This coil or transformer is also one of the present invention. In the present invention, the above-described film, after assembling a coil or transformer composed of a magnetic core and a winding, can be attached or installed by another appropriate method to manufacture the coil or transformer of the present invention. ,
The coil or the transformer can be manufactured without particularly changing the conventional manufacturing process.

The above-mentioned film is installed so as to be in contact with the magnetic core, but is preferably installed on the end face of the magnetic core. The magnetic core is not particularly limited, and may be, for example, a commonly used E-shaped magnetic core. The material forming the magnetic core is not particularly limited, and examples thereof include a silicon steel plate, a ferrite sintered body, and the like which are generally used.

In this case, the surface in contact with the magnetic core of the film may not be provided with a support layer, but is preferably provided with a support layer from the viewpoint of improving the electromagnetic characteristics.

FIGS. 2 and 3 show a preferred embodiment of the coil or transformer of the present invention. FIG. 2 shows an embodiment in which a film is installed on an E-shaped magnetic core. In the present embodiment, the magnetic core is an E-shaped core 4 made of a silicon steel plate. A copper wire 5 is wound around the central convex portion of the E-shaped core 4. The copper wire 5 is preferably a urethane-coated copper wire. A film is placed on the end face 6 of the E-shaped core 4. The film comprises an amorphous soft magnetic metal foil 1, a support layer 2, and a surface protection layer 3.
And is appropriately cut according to the size of the E-shaped core 4. The support layer 2 and the surface protection layer 3 are insulating resin layers. The transformer shown in FIG. 3 can be configured by facing two coils of the coil shown in FIG. For example, in a contactless charging device, when the coil shown in FIG. 2 is mounted on each of the battery body and the charger, and the battery body is set in the charger, the transformer shown in FIG. 3 is configured.

In this embodiment, since the support layer 2 of the film is made of an adhesive resin, it can be attached to the end face 6 of the E-shaped core 4 to install the film.

FIG. 3 shows an embodiment in which one film is interposed between opposing E-shaped cores 4 '. In this case, it is convenient to use a film in which both the support layer 2 and the surface protection layer 3 of the film are made of an adhesive resin. As shown in FIG. 3, the film may be installed such that the entire end face is widely covered with a single film as shown in a in FIG. 3, and the film is applied only to each end face portion of the magnetic core as shown in b. May be installed.

In addition to the above, the transformer of the present invention may be, for example, one having a pot-shaped ferrite core shown in FIGS. 4A and 4B, one having a rod-shaped core shown in FIG. Among them, those having a C-shaped magnetic core shown in (d) and (e) can be cited. In FIG. 4B, a hollow portion at the center of the film as shown in FIG. 4A is not provided.

In the method of the present invention, as described above,
By installing the film of the present invention on a part of the magnetic core constituting the coil or the transformer, the electromagnetic properties such as the Q value and the effective magnetic permeability of the coil or the transformer can be remarkably improved.

In the present invention, the electromagnetic characteristics of the coil or the transformer can be adjusted by interposing the support layer between the amorphous metal foil and the coil or the transformer. That is, even when the same amorphous metal foil is used, the electromagnetic characteristics of the coil or transformer on which the film of the present invention is installed change according to the thickness of the support layer. For example, as shown in FIG. 6, the Q value increases as the thickness of the support layer increases, and as shown in FIG. 7, the effective magnetic permeability decreases as the thickness of the support layer increases. Therefore, the thickness of the support layer can be appropriately set in consideration of the balance between the Q value of the coil or the transformer and the effective magnetic permeability. Generally, the thickness of the support layer is more preferably 40 to 300 μm. Thus, in the present invention, the inductance can be designed and set in an extremely wide range by appropriately selecting both the selection of the amorphous metal foil and the setting of the thickness of the film support layer. This fact is also one of the important findings that led to the completion of the present invention.

In addition, the method of the present invention uses a coil or transformer.
The film of the present invention is applied to a part of the magnetic core constituting the
It can be performed simply by installing
You. Therefore, for example, the following application is possible.Apply the film of the present invention to a coil or transformer only when necessary.
How to install  When charging, use a coil or transformer, such as a cordless charger.
The film of the present invention is used only when the function of
Install it on a coil or transformer to reduce the electromagnetic induction
On the other hand, except when charging,
Keep the inventive film isolated from the coil or transformer
An installation method can be adopted. For example, the contactless
For point-type charging equipment, the battery body and charger
Each is equipped with a coil having an E-shaped magnetic core.
And either the battery or the charger
With the film of the present invention installed on the coil,
When the battery body is set, the transformer shown in FIG.
Can be configured.Method of controlling equipment by detecting film installation of the present invention  When the film of the present invention is near or far from the coil or transformer
Detects inductance change due to shaking
In addition, the operation of the device can be controlled. For example, the code
In a wireless charger, the film of the present invention and a coil or
Inductance increases when approaching Lance
Charging to start charging.
Electric appliances can be controlled.Method for utilizing the magnetic shielding effect of the film of the present invention  The film of the present invention uses an amorphous soft magnetic metal foil.
However, the above amorphous soft magnetic metal foil has an extremely high magnetic permeability.
Indicates that the magnetic field is concentrated in the foil,
A shielding effect can be exhibited. Therefore, the present invention
Film-based coils and transformers are subject to this effect.
Due to changes in the surrounding magnetic field or the proximity of magnetized material, etc.
Magnetic effects can be reduced.

The soft magnetic metal foil of the present invention comprises a soft magnetic metal foil and an insulating resin layer.
And a film made of an iron-based alloy containing at least one element selected from the group consisting of Mo is installed in a housing in which a coil or a transformer is installed, and used for a method of suppressing magnetic flux leakage. be able to. The soft magnetic metal foil includes a crystalline one and an amorphous one.
Examples of the crystalline material include permalloy and foil of a silicon steel plate.

On the other hand, the amorphous material has a magnetostriction of 5p.
Both below pm and above 5 ppm can be used. Examples of the amorphous soft magnetic metal foil having a magnetostriction of 5 ppm or less include those described above.

Examples of the magnetostriction exceeding 5 ppm include, for example, METGLAS 2605TCA (trade name) (F
e-B-Si system, magnetostriction 27ppm, volume resistivity 137μ
Ω · cm, manufactured by Nippon Amorphous Metals Co., Ltd.), METGLAS 26
05CO (trade name) (Fe-Co-B-Si system, magnetostriction 3
5 ppm, volume resistivity 123 μΩ · cm, manufactured by Nippon Amorphous Metals Co., Ltd.).

When the magnetostriction is 5 ppm or less, the leakage of magnetic flux can be suppressed efficiently by installing the film as at least a part of the magnetic core of the coil or the transformer. As a result, the electromagnetic characteristics of the coil or the transformer are reduced. Can be improved. On the other hand, those having a magnetostriction of more than 5 ppm have a high ability to suppress the leakage of magnetic flux, and are preferably installed in a housing.

The film used in the method for suppressing magnetic flux leakage of the present invention has an insulating resin layer. As the insulating resin layer, those already described above can be used.

The film used in the method for suppressing magnetic flux leakage of the present invention is used by being installed in a housing in which a coil or a transformer is installed. As the installation method,
Similar to the method already described above, there is a method in which the coil or the transformer is installed as a part of a magnetic core. In addition, it does not prevent installation in all of the magnetic cores constituting the coil or the transformer. In addition, there is a method in which the coil or the transformer is installed in a housing provided with the transformer. Installation to the housing where the coil or transformer is installed is performed so as to include a place showing the maximum intensity of the leakage magnetic flux, and furthermore, by performing so as to form a closed magnetic circuit, the leakage magnetic flux is efficiently installed. Can be suppressed.

The following devices can be given as specific examples of devices that generate a leakage magnetic flux. -Using electric heaters; for example, electric blankets, electric carpets, water beds, hair dryers, toasters, grill pans, hot plates, irons, rice cookers, electric kotatsu, electric pots, electric floor heating systems, coffee makers , Futon dryers, etc.-those using electromagnetic coils; for example, televisions, VCRs, electric shavers, electric toothbrushes, washing toilet seats, refrigerators, facsimile machines, hand mixers, ventilation fans,
Electric sewing machine, electric pencil sharpener, CD player, washing machine, dryer, electric fan, juicer mixer, room air conditioner, air washing machine, copy machine, fax machine, vending machine, electromagnetic valve, etc.-Use high frequency circuit or inverter circuit Audio devices such as electromagnetic cookers, microwave ovens, PHS, pagers, mobile phones, cordless phones, desktop personal computers, notebook personal computers, word processors, game machines, humidifiers, fluorescent lights, amplifiers and tuners Etc.-with servo motor, pulse motor or stepping motor; quartz oscillation clock such as wristwatch, table clock, wall clock, stopwatch, pacemaker, camera, VCR, video camera, MD, C
Equipment handling rotary storage media such as D, CD-R, CD-RW, FD, PD, MO, etc., metering pumps, etc.-Others: AC adapter for electronic equipment, laser type, thermal transfer type and dot impact type printer, CRT type , Liquid crystal and plasma displays, GPS navigation equipment, magnetic detection sensors, hearing aids, charging devices, etc.

[0045]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 As shown in FIG. 1, one side of a 22 μm-thick amorphous soft magnetic metal foil composed of elements of Co, Fe, Ni, Mo, B and Si was used as a surface protective layer to a thickness of 46 μm. And a polyester adhesive film having a thickness of 150 μm as a support layer (spacer) was disposed on the other surface. A laminated film having such a structure (7 m in size)
mx28 mm), as shown in FIG. 2, the E-type core end face of the inductance measuring coil is brought into close contact with the support layer,
The inductance was measured as follows, and the Q value and the effective magnetic permeability were determined. The results are shown in Table 1.

[0047]Inductance measurement method  0.35mm thickness for inductance measurement coil
E-type silicon steel sheets (around 21 mm x 28 mm)
A 0.7mm diameter urethane-coated copper wire on the stacked E-shaped core
Was used for 100 turns. As a measuring instrument,
Precision LCR meter manufactured by urette Packard
-(HP4284A), measurement frequency 1kHz, measurement
The inductance was measured at a constant voltage of 1V. Also measure
Is the inductance value of the inductance measuring coil
Is adjusted to 1.00 and the Q value to 10.0.
Was.

[0048]Calculation of effective permeability  EUT core end face of coil for inductance measurement
The inductance value measured with the
Divided by the inductance value of the coil for measuring inductance
The value was defined as the effective magnetic permeability of the measured object.

[0049]Calculation of Q value  The Q value was calculated from the following equation. Q = ωL / r where ω is the angular frequency, L is the inductance value, and r is the effective
The resistance values are indicated respectively.

Example 2 Example 1 was repeated except that the thickness of the support layer was 200 μm.
In the same manner as in the above, a laminated film was produced. Using this laminated film, the inductance was measured in the same manner as in Example 1, and the Q value and the effective magnetic permeability were determined. The results are shown in Table 1.

Example 3 Example 1 except that the thickness of the support layer was 250 μm.
In the same manner as in the above, a laminated film was produced. Using this laminated film, the inductance was measured in the same manner as in Example 1, and the Q value and the effective magnetic permeability were determined. The results are shown in Table 1.

Example 4 Instead of a 22 μm-thick amorphous soft magnetic metal foil composed of elements of Co, Fe, Ni, Mo, B and Si, Co, F
A laminated film was produced in the same manner as in Example 1 except that an 18 μm-thick amorphous soft magnetic metal foil composed of elements e, Ni, B and Si was used. Using this laminated film, the inductance was measured in the same manner as in Example 1, and the Q value and the effective magnetic permeability were determined. The results are shown in Table 1.

Example 5 The procedure of Example 1 was repeated, except that two 22 μm-thick amorphous soft magnetic metal foils made of elements of Co, Fe, Ni, Mo, B and Si were used. , To produce a laminated film. Using this laminated film, the inductance was measured in the same manner as in Example 1, and the Q value and the effective magnetic permeability were determined. The results are shown in Table 1.

Example 6 A laminated film similar to that of Example 1 was used as shown in FIG.
While using the pair of E-shaped cores, power is supplied to the coil and a portable Gauss meter (HT-320, MTI
5c from the DUT using an AC magnetic field probe
A magnetic field strength measurement was performed at a position separated by m. As a result, the magnetic field strength was 42 mG. On the other hand, when the magnetic field strength was measured by the above-described method in a state where the laminated film was removed from the configuration in FIG. 3B, it was 121 mG. From these results, it was found that the use of the film made of the non-metallic foil and the resin of the present invention as a part of the core of the coil or the transformer can suppress the leakage of the electromagnetic wave.

Comparative Example 1 Instead of a 22 μm-thick amorphous soft magnetic metal foil made of Co, Fe, Ni, Mo, B and Si, Co, F
Except for using a 25 μm-thick amorphous soft magnetic metal foil composed of elements e, B and Si, in the same manner as in Example 1,
A laminated film was produced. Using this laminated film,
The inductance was measured in the same manner as in Example 1, and the Q value and the effective magnetic permeability were determined. The results are shown in Table 1.

Comparative Example 2 In place of the amorphous soft magnetic metal foil having a thickness of 22 μm comprising the elements Co, Fe, Ni, Mo, B and Si, Fe, B,
A laminated film was produced in the same manner as in Example 1, except that a 30 μm-thick amorphous soft magnetic metal foil made of elements of Si and C was used. Using this laminated film, the inductance was measured in the same manner as in Example 1, and the Q value and the effective magnetic permeability were determined. The results are shown in Table 1.

COMPARATIVE EXAMPLE 3 A 350 μm thick silicon steel sheet (size 7 mm × 28 m
m) was covered with a 46 μm-thick polyester adhesive film as a surface protective layer, and a 46 μm-thick polyester adhesive film was provided as a support layer (spacer) on the other surface. Using this laminated film, the inductance was measured in the same manner as in Example 1, and the Q value and the effective magnetic permeability were determined. The results are shown in Table 1.

[0058]

[Table 1]

From the above results, in Examples 1 to 4, a large Q value was obtained, and the magnetic core and the film of the present invention
It turned out that a magnetic circuit with little loss was formed. From Examples 1 to 3, it can be estimated that a higher magnetic permeability can be obtained by reducing the thickness of the support layer. Example 5
This indicates that it is possible to use a plurality of amorphous soft magnetic metal foils stacked on each other. Therefore, it is possible to prevent the deterioration while maintaining the electromagnetic characteristics.

On the other hand, in Comparative Examples 1 and 2, the effective magnetic permeability showed a relatively large value. However, since the material was large in magnetostriction, the Q value was small and the loss was large. Also,
In Comparative Example 3, the effective magnetic permeability was small even though the thickness of the support layer was as thin as 46 μm. In Comparative Example 3, it was found that even when the support layer was further brought closer to the coil, the effective magnetic permeability hardly increased, the Q value was small, and the loss was large.

Comparative Example 4 A composite material in which Mn—Zn ferrite particles were dispersed in a chlorinated polyethylene resin so as to have a weight ratio of 90% was obtained.
Processed to thickness 2.5mm, size 7mm x 28mm,
The coil was brought into close contact with the end surface of the E-shaped core of the inductance measuring coil, and the inductance was measured in the same manner as in Example 1.
The Q value and the effective magnetic permeability were determined. In this laminated film,
No support layer was provided. The effective magnetic permeability of this laminated film was 1.5, and the Q value was 9.5. In this case, the effective magnetic permeability was a very small value even though there was no support layer and the magnetic material was in close contact with the E-shaped core.

Embodiment 7Suppression of magnetic flux leakage in quartz watches
System  Thickness 2 composed of Co, Fe, Ni, Mo and Si elements
Both sides of 2 μm amorphous soft magnetic metal foil are used as surface protection layers
Cover with a 46μm thick polyester adhesive film
To produce a laminated film. Clean this laminated film
By installing it on the back of a quartz wristwatch,
The bundle was reduced. The measurement is a TriField meter
The measurement was performed using a magnetic field mode (manufactured by WB Lee).
Note that the measurement was performed with the object to be measured in close contact with a measuring instrument.result  The magnetic flux density when no laminated film is installed is 5 milligau
Was better than In contrast, stepping
Direction connecting the north and south poles of the motor coil and the lamination
Rolling direction of amorphous soft magnetic metal foil used for film
The magnetic flux density when installed so that
Rigaus, but when installed orthogonally
The magnetic flux density was 2.5 milligauss. From this,
The direction of the generated magnetic flux and the permeability of the laminated film are maximum
When the direction of
It was found that it could be reduced.

Embodiment 8Suppression of AC adapter magnetic flux leakage
System  25 μm thick amorphous material composed of Fe, B and Si elements
Both sides of soft magnetic metal foil are 46 μm thick as a surface protection layer
Laminated polyester film
Lum created. A notebook using this film
AC adapter for portable personal computers (60m
(m × 100mm × 30mm) inside plastic housing
To reduce the leakage of magnetic flux.
Was.

[0064]Installation method  At the position of the shaded portion shown in FIG.
Lum was installed. The installation mode is the following 3) a) to c)
It is an aspect, and in each case, the condition is satisfied
I stuck it on the inside. In addition, paste the laminated film
Location includes the location with the highest leakage magnetic flux density.
Was. a) Paste the beginning and end of the film by overlapping 5mm
B) The start and end of the film should be separated by 2 mm
C) Four laminated films were provided with a gap of 2 mm.
Pasted on 4 sidesMeasuring method  The magnetic flux density at the commercial frequency is calculated using a Gauss meter and a three-axis sensor.
It was measured using a sensor. AC magnetic flux density
Covers the six sides of the adapter with 22 measurement points and obtains from all measurement points
The evaluation was made based on the total of the magnetic flux densities.result  Total value of leakage magnetic flux density when no laminated film is installed
Was 2.7 Gauss. In contrast, installation conditions a)
0.9 gauss, installation conditions b) 2.1 gauss and installation conditions
c) 2.1 Gauss. From these results, the installation conditions
By forming a closed magnetic circuit as shown in FIG.
It was found that the leakage magnetic flux can be suppressed efficiently.

Embodiment 9Reduction of magnetic flux leakage from hair dryer
System  Fe, Co, B and Si elements having a thickness of 23 μm
Both sides of the amorphous soft magnetic metal foil have a thickness of 4 as a surface protective layer.
By covering with a 6μm polyester adhesive film,
A layer film was made. Hair dryer with power consumption of 1400W
Plastic outer housing to cover the ear motor
A 5mm wide laminated film is wound around the gap between
When the start and end of the winding overlap by 5 mm
The part was wound around once so that the laminated film might surround it. quotient
Gauss meter and 3-axis sensor for magnetic flux density at operating frequency
It was measured usingresult  The leakage magnetic flux density when no laminated film is installed is 530.
Although it was milligauss, a laminated film was installed
In this case, the leakage magnetic flux density decreased to 350 milligauss.

[0066]

The film comprising the amorphous metal foil and the resin according to the present invention has the above-mentioned structure, so that it can be easily formed into various shapes and can be easily manufactured. In addition, the film of the present invention can freely design the inductance of the coil or the transformer over a wide range simply by being installed on a part of the magnetic core of the coil or the transformer, has a small loss even in a high frequency band, and has an effective magnetic permeability. Can be increased.

Further, by providing a film-shaped amorphous metal foil, the characteristics of the coil or the transformer can be improved, and at the same time, the leakage of the electromagnetic field can be suppressed. Performance can be easily and inexpensively improved. Further, the change of the electromagnetic characteristics of the coil or the transformer by the film of the present invention can be used to contribute to cordless and control of the device.

Further, the method for suppressing magnetic flux leakage according to the present invention
By applying the present invention to various electric devices, the leakage magnetic flux density can be reduced easily and inexpensively, and it is extremely useful as a practical method.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a film of the present invention.

FIG. 2 is a perspective view illustrating an embodiment when the film of the present invention is installed on an E-shaped core.

FIG. 3 is a diagram illustrating an embodiment when the film of the present invention is installed on two E-shaped cores.

FIG. 4 is a conceptual diagram illustrating a shape of a core on which the film of the present invention is installed.

FIG. 5 is a conceptual diagram showing the shape of a core on which the film of the present invention is installed.

FIG. 6 is a graph showing a relationship between a thickness of a support layer and a Q value. The vertical axis is the Q value, and the horizontal axis is the thickness (μ) of the support layer.
m).

FIG. 7 is a graph showing a relationship between a thickness of a support layer and an effective magnetic permeability. The vertical axis is the effective magnetic permeability, and the horizontal axis is the thickness (μm) of the support layer.

FIG. 8 is a diagram showing a film installation location in Example 8.

[Description of Signs] 1 Amorphous soft magnetic metal foil 2, 3 Insulating resin layer (supporting layer or surface protective layer) 4, 4 'core 5, 5' copper wire 6 End face

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E041 AA11 AA19 BC05 BD03 CA02 NN00 NN05 NN15 5E070 AA01 AA11 AB04 AB10 BA06 BA07 BA08 BA11 BB01 BB02 DA02 DA04 DA15 DA17 DB06 EA06

Claims (22)

[Claims] 1. A film installed on a part of a magnetic core constituting a coil or a transformer for use in improving electromagnetic characteristics of the coil or the transformer and suppressing electromagnetic field leakage. The amorphous metal foil is made of an iron-based alloy containing at least one element selected from the group consisting of B, Si, Co, Ni, and Mo, and has a magnetostriction. Is 5 ppm or less, and a volume resistivity is 100 μΩ · cm or more. 2. An insulating resin layer for forming a surface protective layer is provided on one surface of an amorphous soft magnetic metal foil, and a support layer is formed on another surface of the amorphous soft magnetic metal foil. The film according to claim 1, further comprising an insulating resin layer. 3. The thickness of the surface protective layer and the support layer is 5-6.
3. The film according to claim 2, which has a thickness of 00 μm. 4. The film according to claim 2, wherein at least one of the surface protective layer and the support layer is made of an adhesive resin. 5. An iron-based alloy containing at least one element selected from the group consisting of B, Si, Co, Ni and Mo, having a magnetostriction of 5 ppm or less and a volume resistivity of 100 μΩ · cm or more. And a film comprising an insulating resin layer provided on at least one surface of the amorphous soft magnetic metal foil, which is provided as a part of a magnetic core. Coil or transformer. 6. An amorphous soft magnetic metal foil, and a film comprising an insulating resin layer provided on at least one surface of the amorphous soft magnetic metal foil is provided on an end face of a magnetic core. A coil or transformer as described. 7. The film is provided with an insulating resin layer for forming a surface protective layer on one surface of the amorphous soft magnetic metal foil, and a support layer on the other surface of the amorphous soft magnetic metal foil. 7. The coil or the transformer according to claim 6, further comprising an insulating resin layer for forming. 8. The coil or transformer according to claim 7, wherein the magnetic core has a shape selected from the group consisting of an E shape, a pot shape, a rod shape, and a C shape. 9. A part of a magnetic core constituting a coil or a transformer is made of an iron-based alloy containing at least one element selected from the group consisting of B, Si, Co, Ni and Mo, and has a magnetostriction of 5 ppm. Or less, and the volume resistivity is 100
An amorphous soft magnetic metal foil having a resistivity of at least μΩ · cm, and a coil or a transformer characterized by installing a film made of an insulating resin layer provided on at least one surface of the amorphous soft magnetic metal foil. A method for improving electromagnetic characteristics and suppressing electromagnetic field leakage. 10. A film having an insulating resin layer forming a support layer on at least one surface of an amorphous soft magnetic metal foil, wherein a film and a magnetic core forming a coil or a transformer are provided. The method according to claim 9, wherein the film is provided so that the support layer is interposed between the film and a soft magnetic metal foil. 11. The method according to claim 10, wherein the thickness of the support layer is 40 to 300 μm. 12. A film which is installed in a housing in which a coil or a transformer is installed and used for suppressing magnetic flux leakage, said film comprising a soft magnetic metal foil and an insulating resin layer. , The soft magnetic metal foil is B, S
A film comprising an iron-based alloy containing at least one element selected from the group consisting of i, Co, Ni, and Mo. 13. The film according to claim 12, wherein the soft magnetic metal foil is an amorphous metal foil. 14. The film according to claim 13, wherein the amorphous metal foil has a magnetostriction of 5 ppm or less and a volume resistivity of 100 Ω · cm or more. 15. An insulating resin layer forming a surface protection layer is provided on one surface of a soft magnetic metal foil, and an insulating resin layer forming a support layer is provided on another surface of the soft magnetic metal foil. The film according to any one of claims 12 to 14. 16. The surface protective layer and the support layer have a thickness of 5 to 5.
The film according to claim 15, which has a thickness of 600 µm. 17. The method according to claim 1, wherein at least one of the surface protective layer and the support layer is made of an adhesive resin.
17. The film according to 5 or 16. 18. A soft magnet made of an iron-based alloy containing at least one element selected from the group consisting of B, Si, Co, Ni and Mo in a housing in which a coil or a transformer is installed. A method for suppressing magnetic flux leakage, comprising providing a metal foil and a film made of an insulating resin layer provided on at least one surface of the soft magnetic metal foil. 19. The method according to claim 18, wherein the installation of the film is performed on a housing. 20. The method according to claim 18, wherein the installation of the film is performed on at least a part of a magnetic core constituting a coil or a transformer. 21. The soft magnetic metal foil is an amorphous metal foil, has a magnetostriction of 5 ppm or less and a volume resistivity of 10 ppm.
21. The method according to claim 20, which is at least 0 Ω · cm. 22. A soft magnetic metal foil made of an iron-based alloy containing at least one element selected from the group consisting of B, Si, Co, Ni and Mo, and at least one surface of the soft magnetic metal foil A coil or a transformer, characterized in that a film made of an insulating resin layer provided in (1) is provided as at least a part of a magnetic core.