JP2772265B2 - Manufacturing method of magnetic core for high frequency - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a high-frequency magnetic core formed by winding and laminating a metal ribbon.

[0002]

2. Description of the Related Art In recent years, amorphous magnetic metal ribbons have attracted attention as a material constituting a magnetic core for a transformer or a magnetic core for a magnetic amplifier because of its extremely excellent magnetic properties. Amorphous magnetic metal ribbons are particularly attracting attention as high-frequency compatible core materials because of their excellent magnetic properties, especially in the high-frequency range.

A magnetic core using such an amorphous metal ribbon is used by winding a metal ribbon into a desired shape, and is used as a toroidal core or a cut core depending on the application. Have been.

[0004] For example, a cut core using an amorphous metal ribbon is manufactured as follows.

That is, first, an amorphous metal ribbon is wound and laminated on a winding jig so as to have a desired shape. Then, in order to remove distortion of the amorphous metal ribbon and obtain good magnetic characteristics. After being subjected to a heat treatment at a temperature lower than the crystallization temperature, it is cut at an appropriate place to obtain a cut core shape.

[0006] In the case of using such a cut body, if the layers of the wound body are not fixed, deformation of the thin strip on the processed surface or collapse of the wound body shape occurs during cutting or the like. , Impregnated with epoxy resin etc. in the interlayer gap of the wound body,
Processing is performed after the wound body is fixed by curing the resin.

However, when the solid of the amorphous metal ribbon is impregnated with the resin as described above, the amorphous metal ribbon is distorted by the contraction force generated at the time of curing of the resin. There were problems such as an increase in the internal stress of the band and an increase in iron loss of the obtained magnetic core. In particular, epoxy resins are problematic because of their high shrinkage upon curing.

Therefore, measures have been taken to reduce the shrinkage ratio during curing by changing the type of the impregnating resin, for example, and to some extent using amorphous metal ribbons having a relatively narrow width. The effect is obtained. However, a sufficient effect has not been obtained for a magnetic core using a wide amorphous metal ribbon, and there is an urgent need to reduce the core loss of a wound magnetic core.

[0009]

As described above, the magnetic core using the wound body of the amorphous metal ribbon has a problem that iron loss increases due to shrinkage force and the like when the impregnated resin is cured. , Or simply reducing the shrinkage of the resin,
In particular, there is a problem that iron loss cannot be reduced when a wide amorphous metal ribbon is used.

[0010] The amorphous metal ribbon is essentially a magnetic material exhibiting a low iron loss in a high frequency range. However, as described above, particularly when an amorphous metal ribbon having a wide width is used, An increase in iron loss in a high frequency range is a problem.

In view of such a problem, the inventors of the present invention have repeatedly studied focusing on the shape of the amorphous metal ribbon itself. The amorphous metal ribbon produced by the rapid quenching method using the single roll method has a large thickness variation in the width direction. Was found to be the cause of the increase in iron loss.

That is, if there is a difference in the plate thickness at both ends in the width direction of the amorphous metal ribbon, stress concentrates on the thinner plate after winding, and an extremely large stress is applied. It is presumed that the stress of the whole wound body becomes non-uniform, and that the iron loss particularly in a high frequency range increases. Further, when such a shape defect occurs, the interlayer insulation by the resin cannot be sufficiently performed, and the iron loss also increases.

It is considered that such an increase in iron loss in a high frequency region due to a variation in the thickness of the amorphous metal ribbon in the width direction occurs not only in the cut core but also in the toroidal core and the like. .

The present invention has been made based on such findings, and absorbs fluctuations in the sheet thickness in the width direction of a metal ribbon formed by a single roll method, thereby reducing iron loss in a high frequency range. Magnetic core for high frequency that has achieved a great reduction
The purpose of the present invention is to provide a manufacturing method .

[0015]

The first method for producing a high-frequency core according to the present invention SUMMARY OF] of the general formula: Fe _a M _b Y _c (wherein, M is Ti, V, Cr, Mn, Co, Ni, Z
r, Nb, Mo, Hf, Ta, W, Re, Ga, Ru,
At least one element selected from the group consisting of Rh, Pd, Os, Ir, Pt, and rare earth elements, and Y is Si, B, P, C
At least one element selected from the group of
b and c are respectively 65 ≦ a ≦ 85, 0 ≦ b ≦ 15, 5
≤ c ≤ 35)
The width of a metal ribbon made of a base amorphous alloy is determined by the single roll method.
Produced in a range of 10 mm or more and a thickness of 10 μm to 50 μm.
And applying at least two strips of said metal strip to a roll surface.
A process of superimposing a cow or free face on each other
And winding the superposed metal ribbon into a desired magnetic core shape.
A step of laminating and including a resin between the layers of the wound laminated core.
Dipping and hardening to fix the wound body;
Cutting at an appropriate location .

A second high-frequency magnetic coreManufacturing methodIs a general formula: Co_x M '_y Y_z (Where M ′ is Ti, V, Cr, Mn, Fe, Ni, Z
r, Nb, Mo, Hf, Ta, W, Re, Ga, R
u, Rh, Pd, Pt, and rare earth elements.
At least one element, Y is from the group of Si, B, P, C
X, y, and z represent at least one selected element.
65 ≦ x ≦ 80, 0 ≦ y ≦ 15, 10 ≦ c ≦ 35, respectively
From a Co-based amorphous alloy represented by
BecomeUse a single roll method to thin a metal ribbon to a width of at least 10 mm
Process in the range of 10 μm to 50 μm,
Both of the two metal strips are rolled together or freely.
A step of superposing the faces facing each other, and
Winding and laminating the metal strip that has been formed into a desired magnetic core shape,
The resin is impregnated and cured between the layers of the wound laminated magnetic core, and wound.
Fixing the wound body and cutting the wound body at an appropriate place
And a step ofIt is characterized by: Further
3. High frequency magnetic coreManufacturing methodIs represented by the general formula: (Fe_1-m X
_m )_100-npqr Cu_n M ''_p Si_q B_r (Wherein X is at least one selected from Ni and Co)
M '' is a species selected from Nb and Mo
Each represents one element, and m, n, p, q, and r are each
0 ≦ m ≦ 0.3, 0.1 ≦ n ≦ 5, 0.1 ≦ p ≦ 5,5
Satisfies ≦ q ≦ 25, 3 ≦ r ≦ 15, 15 ≦ q + r ≦ 30
50 Å to 30 Å
Soft magnetic alloy with fine grain of 0 Angstrom
BecomeThe metal ribbon is width 10mm or more by the single roll method,
A process in which the thickness is in the range of 10 μm to 50 μm;
At least two of the strips are rolled together or
Superposing the free faces on each other,
A step of winding and laminating the laid metal ribbon into a desired magnetic core shape
And a resin impregnated and cured between the layers of the wound and laminated magnetic core.
Fixing the wound body, and placing the wound body at an appropriate location.
Cutting withIt is characterized by:Ma
The fourth method for manufacturing a high-frequency core is as follows. General formula: Fe _a M _b Y _c (Where M is Ti, V, Cr, Mn, Co, Ni, Z
r, Nb, Mo, Hf, Ta, W, Re, Ga, Ru,
Rh, Pd, Os, Ir, Pt, rare earth elements Select from group
Y is Si, B, P, C
At least one element selected from the group of
b and c are respectively 65 ≦ a ≦ 85, 0 ≦ b ≦ 15, 5
≤c≤35) Fe represented by
The width of a metal ribbon made of a base amorphous alloy is determined by the single roll method.
Produced in a range of 10 mm or more and a thickness of 10 μm to 50 μm.
Process, Roll at least two strips of metal
A process of superimposing a cow or free face on each other
When, Winding the superposed metal ribbon into a desired magnetic core shape
Stacking process and ,A resin mold is applied to the wound and laminated magnetic core.
The process of applying And a fifth height.
The manufacturing method of the magnetic core for frequency General formula: Co _x M ' _y Y _z (Where M ′ is Ti, V, Cr, Mn, Fe, Ni, Z
r, Nb, Mo, Hf, Ta, W, Re, Ga, R
u, Rh, Pd, Pt, and rare earth elements.
At least one element, Y is from the group of Si, B, P, C
X, y, and z represent at least one selected element.
65 ≦ x ≦ 80, 0 ≦ y ≦ 15, 10 ≦ c ≦ 35, respectively
Indicates a number that satisfies From a Co-based amorphous alloy represented by
The metal strip that has a width of at least 10 mm and a thickness of
A step of manufacturing the substrate in a range of 10 μm to 50 μm; Less
Both of the two metal strips are rolled together or freely.
A process of superimposing the faces facing each other, The superposition
Winding and laminating the laid metal ribbon into a desired magnetic core shape; ,
Applying a resin mold to the wound and laminated magnetic core; With
It is characterized by doing. Further, a sixth high-frequency magnet
The manufacturing method of the heart is the general formula: (Fe _1-m X _m ) _100-npqr Cu _n M '' _p Si _q B _r (Wherein X is at least one selected from Ni and Co)
M '' is a species selected from Nb and Mo
Each represents one element, and m, n, p, q, and r are each
0 ≦ m ≦ 0.3, 0.1 ≦ n ≦ 5, 0.1 ≦ p ≦ 5,5
Satisfies ≦ q ≦ 25, 3 ≦ r ≦ 15, 15 ≦ q + r ≦ 30
Indicate the number to do) 50 Angstrom to 30
Soft magnetic alloy with fine grain of 0 Angstrom
Metal strips of width 10mm or more by the single roll method,
A step of producing a film having a thickness of 10 μm to 50 μm; Few
At least two of the strips are rolled together or
A process of superimposing the faces on each other, The superposition
A step of winding and laminating the laid metal ribbon into a desired magnetic core shape
When ,Applying a resin mold to the wound and laminated magnetic core;
It is characterized by having.

The metal ribbon used in the present invention is formed by a rapid quenching method using a single roll method. As described above, the shape of the metal ribbon used has a width of 10 mm or more and a thickness in the range of 10 μm to 50 μm, and exhibits an excellent effect on the metal ribbon having such a shape. It is particularly effective when the difference between the plate thicknesses at both ends in the width direction is about 2 μm or more on average, or when the number of wound layers is 50 or more.

The high-frequency magnetic core of the present invention is manufactured, for example, as follows.

First, a metal ribbon made of the above-described material is applied to a single roll method to obtain a metal ribbon having a width of 10 mm or more and a thickness of 10 mm.
It is prepared in the range of μm to 50 μm. Next, at least two metal strips of the same molding lot obtained are rolled together or rolled together on free surfaces, and in this state, are wound and laminated on a winding jig so as to have a desired magnetic core shape, The wound end is fixed with a heat-resistant tape or the like to produce a wound body. In addition,
It is not always necessary to form the entire wound body into the above-described two-layer winding, and the main part may be wound by this method.

For example, in the case of a toroidal core, it can be obtained by subjecting the obtained wound body to a heat treatment for removing distortion and improving magnetic properties. In the case of a cut core, the obtained wound body is subjected to a heat treatment for removing distortion and improving magnetic properties, then impregnated with an epoxy resin or an inorganic polymer, and then subjected to a hardening treatment to be wound. Between layers is fixed. When an inorganic polymer is used, heat treatment for improving characteristics and curing treatment can be performed simultaneously.
Thereafter, the core is cut into a desired final shape to obtain a cut core.

[0021]

In general, in a metal ribbon obtained by applying the single roll method, a difference in plate thickness at both ends in the width direction occurs about 5 μm. Therefore, by laminating the metal ribbons of the same forming lot with the roll surfaces or the free surfaces facing each other and winding and laminating, it is possible to absorb the difference in the thickness of the whole wound body. Therefore, the wound body is almost uniformly applied with a stress, and it is possible to prevent an increase in iron loss due to non-uniformity of the stress and an extremely large locally applied stress. This is effective in reducing iron loss in a high frequency range when a wide metal ribbon having a width of 10 mm or more is used. Further, in a case where the resin is impregnated between the layers of the wound body, the resin can be well penetrated into the layers, and from this, an increase in iron loss can be prevented.

[0022]

Next, an embodiment of the present invention will be described. Example 1 An amorphous alloy ribbon having a width of 50 mm and having an alloy composition represented by (Fe _0.97 Cr _0.03 ) ₇₉ Si ₁₀ B ₁₁ was produced by a single roll method. The plate thicknesses at both ends in the width direction of the obtained amorphous alloy ribbon were approximately 18 μm and 23 μm on average, and there were fluctuations.

Next, this amorphous alloy ribbon is placed in the longitudinal direction by 2 mm.
After dividing, the roll surfaces (or free surfaces) are overlapped, and two layers are simultaneously wound on a winding jig having a required shape to have a winding layer thickness of 20.
mm to form a wound body.

Next, the roll was heat-treated at 420 ° C. for 80 minutes, then impregnated with an epoxy resin and subjected to a curing treatment to fix the roll.

Thereafter, this resin was cut into two parts to obtain a rectangular cut core for a high-frequency transformer.

FIG. 1 is a diagram showing a cross section of the cut core thus obtained in the laminating direction. As shown in the figure, in the obtained wound body 1, the roll surfaces 2a and the free surfaces 2b of the amorphous alloy ribbons 2 are arranged adjacent to each other and opposed to each other. , The stress distribution of the entire wound body at both ends is also substantially uniform.

Next, using the rectangular cut core for a high-frequency transformer thus obtained, the iron loss was measured under the measurement conditions shown in Table 1. Table 1 shows the results.

As a comparison with the present invention, a single-layered wound body of the same shape was manufactured using the amorphous alloy ribbon manufactured in Example 1 and a rectangular cut for a transformer was similarly manufactured. Got the core.

FIG. 2 is a diagram showing a cross section of the cut core of Comparative Example 1 obtained in the laminating direction. As shown in the figure, in the obtained wound body 1, the roll surface 2a and the free surface 2b of the amorphous alloy ribbon 2 are arranged adjacent to each other and opposed to each other. The thickness of the wound layer at both ends is significantly different, so that the stress is concentrated on the thinner strip in the width direction.

The iron loss of the rectangular cut core for the high-frequency transformer of Comparative Example 1 was measured under the same conditions as in Example 1. The results are shown in Table 1.

[0031]

[Table 1] As is clear from the results in Table 1, it is understood that the core of this example has a core loss reduced by about 30%. In addition, since the magnetic core of Example 1 was wound in two layers simultaneously, the molding time of the wound body could be reduced. Was produced by (Example _{2) Fe 73.5 Cu 1.5 Nb 3.0} Si 15.5 single roll method amorphous alloy ribbon of the alloy composition represented as wide samples 25mm in B _6.5. The plate thicknesses at both ends in the width direction of the obtained amorphous alloy ribbon were approximately 21 μm and 25 μm on average, and fluctuations were observed.

Next, this amorphous alloy ribbon is placed in the longitudinal direction by 2 mm.
After dividing, the roll surfaces (or free surfaces) are overlapped, and two layers are simultaneously wound on a winding jig having a required shape to have a winding layer thickness of 20.
mm to form a wound body.

Next, the rolled body is subjected to a heat treatment at 550 ° C., which is higher than the crystallization temperature of the alloy ribbon of 523 ° C., in a nitrogen atmosphere for 60 minutes, and then impregnated with an epoxy resin and cured. To fix the wound body.

Thereafter, the wound body in which the layers were fixed with the resin was cut from a predetermined position and divided into two parts to obtain a rectangular cut core for a high-frequency transformer.

For this cut core, the iron loss was measured under the measurement conditions shown in Table 2.

Using the amorphous alloy ribbon produced in Example 2 above, a wound body of the same shape is produced by single-layer winding, heat-treated under the same conditions, and a rectangular cut core for a high-frequency transformer. (Comparative Example 2) was prepared, and the core loss was similarly evaluated for this cut core. Table 2 shows the results.

[0037]

[Table 2] As is clear from the results in Table 2, it is understood that the core of this example has a core loss reduced by about 15%.

[0038]

[0039]

[0040]

[0041]

Example 4 An amorphous alloy ribbon having an alloy composition represented by Fe ₇₈ Si ₉ B ₁₃ was prepared by a single roll method as a sample having a width of 50 mm.

Next, this amorphous alloy ribbon was cut in the longitudinal direction so as to have various widths, thereby producing a plurality of types of amorphous alloy ribbons having different widths. Next, these amorphous alloy ribbons are divided into two in the longitudinal direction, the roll surfaces (or free surfaces) are overlapped, and two layers are simultaneously wound and laminated on a winding jig having a required shape. Wound bodies were produced so that the layer thickness was 1: 1.

Next, these rolls were subjected to a heat treatment at 400 ° C. for 2 hours, followed by resin molding to produce a toroidal core.

As a comparative example, a plurality of types of amorphous alloy ribbons having different widths used in the above examples were used.
A toroidal core was produced in the same manner except that a wound body was formed by winding these amorphous alloy ribbons into a single layer.

Using the toroidal cores of these Examples and Comparative Examples, iron loss was measured under the conditions of f = 10 kHz and B = 0.3 T, respectively. The results are shown in FIG. 3, where the width of the amorphous alloy ribbon, the toroidal core iron loss P of the example when the same width of amorphous alloy ribbon was used, and the iron loss Po of the toroidal core of the comparative example. As a relationship with the ratio (Po / P).

As is clear from the figure, the width is 10 mm.
When using the above amorphous alloy ribbon, the effect of reducing iron loss in a high frequency range is remarkably exhibited, and the effect is larger as the width of the amorphous alloy ribbon is wider. Recognize.

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

As described above, according to the method for manufacturing a high-frequency magnetic core of the present invention, a wound body excellent in dimensional accuracy on both sides in the width direction of a wide metal ribbon having a width of 10 mm or more can be obtained. As a result, since the stress distribution of the entire wound body becomes uniform, it becomes possible to greatly reduce iron loss in a high frequency range with good reproducibility.

[Brief description of the drawings]

FIG. 1 is a drawing showing a cross section of a cut core according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a cross section of a cut core of Comparative Example 1.

FIG. 3 shows the relationship between the width of the amorphous alloy ribbon of the toroidal core produced in Example 4 of the present invention and the iron loss ratio with the toroidal core produced by single-layer winding using the same width of the ribbon. FIG.

[Explanation of symbols]

 1 ... wound body 2 ... amorphous alloy ribbon 2 a ... roll surface 2 b ... free surface

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takao Sawa 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Corporation Yokohama Office (72) Inventor Noriaki Yagi 8 Shin-Sugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Toshiba Corporation (56) References JP-A-59-115508 (JP, A) JP-A-59-35411 (JP, A) JP-A-60-181237 (JP, A) JP-A-61-250162 (JP, A A) JP-A-62-152113 (JP, A) JP-A-60-70157 (JP, A) JP-A-63-239906 (JP, A) JP-A-62-268110 (JP, A) (58) Survey Field (Int.Cl. ⁶ , DB name) H01F 27/24 H01F 41/02

Claims (6)

(57) [Claims] 1. The general formula: Fe_a M_b Y_c (Where M is Ti, V, Cr, Mn, Co, Ni, Z
r, Nb, Mo, Hf, Ta, W, Re, Ga, Ru,
Rh, Pd, Os, Ir, Pt, selected from the group of rare earth elements
Y is Si, B, P, C
At least one element selected from the group of
b and c are respectively 65 ≦ a ≦ 85, 0 ≦ b ≦ 15, 5
≤ c ≤ 35)
Base amorphous alloyThe width of the metal ribbon is determined by the single roll method
Produced in a range of 10 mm or more and a thickness of 10 μm to 50 μm.
Process, At least two strips of said metal are rolled to each other,
Is a process of superimposing free surfaces on each other, Winding and laminating the superposed metal ribbons into a desired magnetic core shape
Process and ,The resin is impregnated and cured between the layers of the wound laminated magnetic core, and wound.
Fixing the rotator, Cut the wound body at an appropriate place
The process of cutting Of a high frequency magnetic core characterized by having
Production method. 2. The general formula: Co_x M '_y Y_z (Where M ′ is Ti, V, Cr, Mn, Fe, Ni, Z
r, Nb, Mo, Hf, Ta, W, Re, Ga, R
u, Rh, Pd, Pt, and rare earth elements.
At least one element, Y is from the group of Si, B, P, C
X, y, and z represent at least one selected element.
65 ≦ x ≦ 80, 0 ≦ y ≦ 15, 10 ≦ c ≦ 35, respectively
From a Co-based amorphous alloy represented by
BecomeUse a single roll method to thin a metal ribbon to a width of at least 10 mm
A step of manufacturing the substrate in a range of 10 μm to 50 μm; At least two strips of said metal are rolled to each other,
Is a process of superimposing free surfaces on each other, Winding and laminating the superposed metal ribbons into a desired magnetic core shape
Process and ,The resin is impregnated and cured between the layers of the wound laminated magnetic core, and wound.
Fixing the rotator, Cut the wound body at an appropriate place
The process of cutting Of a high frequency magnetic core characterized by having
Production method. 3. The general formula: (Fe_1-m X_m )_100-npqr Cu_n M ''_p Si_q B_r
(Wherein X is at least one selected from Ni and Co)
M '' is a species selected from Nb and Mo
Each represents one element, and m, n, p, q, and r are each
0 ≦ m ≦ 0.3, 0.1 ≦ n ≦ 5, 0.1 ≦ p ≦ 5,5
Satisfies ≦ q ≦ 25, 3 ≦ r ≦ 15, 15 ≦ q + r ≦ 30
50 Å to 30 Å
Soft magnetic alloy with fine grain of 0 Angstrom
BecomeThe metal ribbon is width 10mm or more by the single roll method,
A step of producing a film having a thickness of 10 μm to 50 μm; At least two strips of said metal are rolled to each other,
Is a process of superimposing free surfaces on each other, Winding and laminating the superposed metal ribbons into a desired magnetic core shape
Process and ,The resin is impregnated and cured between the layers of the wound laminated magnetic core, and wound.
Fixing the rotator, Cut the wound body at an appropriate place
The process of cutting Made of high frequency magnetic core
Construction method. 4. The general formula: Fe _a M _b Y _c (Where M is Ti, V, Cr, Mn, Co, Ni, Z
r, Nb, Mo, Hf, Ta, W, Re, Ga, Ru,
Rh, Pd, Os, Ir, Pt, selected from the group of rare earth elements
Y is Si, B, P, C
At least one element selected from the group of
b and c are respectively 65 ≦ a ≦ 85, 0 ≦ b ≦ 15, 5
≤c≤35) Fe represented by
The width of a metal ribbon made of a base amorphous alloy is determined by the single roll method.
Produced in a range of 10 mm or more and a thickness of 10 μm to 50 μm.
Process, At least two strips of said metal are rolled to each other,
Is a process of superimposing free surfaces on each other, Winding and laminating the superposed metal ribbons into a desired magnetic core shape
Process and ,Applying a resin mold to the wound and laminated magnetic core; With
A method for manufacturing a high-frequency magnetic core. 5. The general formula: Co _x M ' _y Y _z (Where M ′ is Ti, V, Cr, Mn, Fe, Ni, Z
r, Nb, Mo, Hf, Ta, W, Re, Ga, R
u, Rh, Pd, Pt, and rare earth elements.
At least one element, Y is from the group of Si, B, P, C
X, y, and z represent at least one selected element.
65 ≦ x ≦ 80, 0 ≦ y ≦ 15, 10 ≦ c ≦ 35, respectively
Indicates a number that satisfies From a Co-based amorphous alloy represented by
The metal strip that has a width of at least 10 mm and a thickness of
A step of manufacturing the substrate in a range of 10 μm to 50 μm; At least two strips of said metal are rolled to each other,
Is a process of superimposing free surfaces on each other, Winding and laminating the superposed metal ribbons into a desired magnetic core shape
Process and ,Applying a resin mold to the wound and laminated magnetic core; With
A method for manufacturing a high-frequency magnetic core. 6. General formula: (Fe _1-m X _m ) _100-npqr Cu _n M '' _p Si _q B _r (Wherein X is at least one selected from Ni and Co)
M '' is a species selected from Nb and Mo
Each represents one element, and m, n, p, q, and r are each
0 ≦ m ≦ 0.3, 0.1 ≦ n ≦ 5, 0.1 ≦ p ≦ 5,5
Satisfies ≦ q ≦ 25, 3 ≦ r ≦ 15, 15 ≦ q + r ≦ 30
Indicate the number to do) 50 Angstrom to 30
Soft magnetic alloy with fine grain of 0 Angstrom
Metal strips of width 10mm or more by the single roll method,
A step of producing a film having a thickness of 10 μm to 50 μm; At least two strips of said metal are rolled to each other,
Is a process of superimposing free surfaces on each other, Winding and laminating the superposed metal ribbons into a desired magnetic core shape
Process and ,Applying a resin mold to the wound and laminated magnetic core; With
A method for manufacturing a high-frequency magnetic core.