JP2000323336A - Inductor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductor which is easy to be manufactured and can be formed thin, and its manufacturing method. SOLUTION: Metal conductor 13 is sandwiched by two plane type magnetic members 11, 12, and an inductor in which a nonmagnetic layer is formed by the thickness of the metal conductor 13 between the two plane type magnetic members 11, 12 is constituted. By the nonmagnetic layer between the two plane type magnetic members 11, 12, the magnetic field intensity generating magnetic saturation is increased, and magnetic saturation can be evaded. By changing the arrangement or the form of the metal conductor 13 between the two plane type magnetic members 11, 12, an inductance value can be set arbitrarily, and manufacturing is very easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inductor used for an output smoothing circuit of a CPU core power supply and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, various types of output smoothing inductors of a CPU core power supply have been developed in accordance with the low voltage and large current of the CPU specifications.

The shape of this type of inductor has an area occupied by about 12 mm square at the time of mounting, and the height dimension is determined in consideration of a capacitor to be mounted at the same time.

[0004] The inductance required for this type of inductor is becoming smaller as the switching frequency of the power supply increases. At present, 300KH
z is about 1 to 2 μH. When the switching frequency of the power supply is further increased, the inductance required for the smoothing inductor is further reduced, and is expected to be 1 μH or less.

Since a large current of, for example, about 10 A flows through the output smoothing inductance of the CPU core power supply,
Even if such a large current flows, it is required that a required inductance be obtained.

In order to suppress heat generation due to a large current,
It is important to reduce the DC resistance. In order to reduce the DC resistance, the cross-sectional area of the conductor may be increased, but the shape of the inductor must be kept within an allowable dimension, and a high degree of space factor in the winding is required.

For these reasons, the output smoothing inductor of the conventional CPU core power supply is a high-density winding of a copper wire having a circular or rectangular cross section around a core made of ferrite, metal powder, or an amorphous alloy. It is manufactured by surrounding the outer periphery with a magnetic material.

[0008]

However, since the output smoothing inductor of the conventional CPU core power supply described above has a structure in which a wire is wound around the core, the manufacturing process becomes complicated, resulting in high cost. Therefore, there is a problem in that the shape of the device becomes thicker, which restricts the thinning of the device for use in a notebook computer or the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inductor which is easy to manufacture and can be formed thin and a method for manufacturing the same in view of the above problems.

[0010]

In order to achieve the above object, according to the present invention, a metal conductor having a predetermined length is sandwiched between first and second plate-like magnetic members. There is proposed an inductor having a non-magnetic layer formed at least in a portion other than the metal conductor between the magnetic members.

According to the inductor, a metal conductor is sandwiched between the first and second plate-shaped magnetic members, so that a gap is formed between the first and second plate-shaped magnetic members by the thickness of the metal conductor. The gap becomes a non-magnetic layer. The non-magnetic layer increases the magnetic field intensity at which magnetic saturation occurs, so that magnetic saturation can be avoided. Further, the inductance value can be arbitrarily set by changing the arrangement and shape of the metal conductor between the two flat magnetic members.

According to a second aspect of the present invention, in the inductor according to the first aspect, the metal conductor has two or more terminal portions including both end portions, and the terminal portions are exposed to the outside to form wiring terminals. We propose an inductor that is

According to the inductor, the manufacturing process can be simplified by exposing the terminal portion of the metal conductor to the outside to serve as a wiring terminal. Further, by providing three or more terminal portions, it is possible to stabilize the fixing when mounting the substrate.

According to a third aspect of the present invention, there is provided the inductor according to the first aspect, wherein the metal conductor has a band or string shape.

According to the inductor, since the metal conductor is in the shape of a band or a string, it is easy to manufacture and the thickness can be reduced.

According to a fourth aspect of the present invention, there is provided the inductor according to the first aspect, wherein the metal conductor is disposed so as to meander substantially between the two flat magnetic members.

According to the inductor, the first and the second
By arranging the metal conductor so as to meander substantially between the plate-shaped magnetic members described above, the metal conductor was formed in a ring shape to increase the inductance value.

According to a fifth aspect of the present invention, there is provided the inductor according to the first aspect, wherein the flat magnetic member is made of a mixture of a magnetic material and a resin.

According to the inductor, the plate-shaped magnetic member is formed of a mixture of a magnetic material and a resin, thereby facilitating manufacturing and simplifying the manufacturing process.

According to a sixth aspect of the present invention, there is provided the inductor according to the first aspect, wherein the first and second plate-shaped magnetic members have different magnetic characteristics.

According to the inductor, the first and the second
By making the magnetic characteristics of the plate-shaped magnetic members different from each other, an inductor having two different types of magnetic characteristics simultaneously can be obtained. The use of ferrite with high magnetic permeability as the flat magnetic member reduces the loss at high frequencies, and the use of metal compacts or amorphous alloys provides excellent DC superposition characteristics. Can be configured.

According to a seventh aspect of the present invention, in the inductor according to the first aspect, a groove for arranging the metal conductor is formed in at least one of the plate-shaped magnetic members, and the depth of the groove is greater than the thickness of the metal conductor. Also, an inductor is proposed in which a non-magnetic layer is formed between the two plate-shaped magnetic members due to the difference therebetween.

According to the inductor, a groove for disposing the metal conductor is formed in the flat magnetic member,
The fixing position of the metal conductor at the time of manufacture was made clear. Further, the thickness of the nonmagnetic layer can be adjusted by the difference between the depth of the groove and the thickness of the metal conductor.

According to an eighth aspect of the present invention, in the inductor according to the first aspect, a groove for arranging the metal conductor is formed in at least one of the flat magnetic members.
The present invention proposes an inductor in which the depth of the groove is set to be equal to or greater than the thickness of the metal conductor, and a non-magnetic member constituting the non-magnetic layer is provided between the two flat magnetic members.

According to the inductor, the metal conductor is embedded in the groove, and the thickness of the nonmagnetic layer can be set by the thickness of the nonmagnetic member.

In a ninth aspect of the present invention, there is provided the inductor according to the first aspect, wherein the metal conductor is formed by stamping a metal plate having a predetermined thickness into a predetermined shape.

According to the inductor, a metal plate having a predetermined thickness is punched and formed to form a metal conductor having a precisely set thickness and shape by forming a metal response. Increased accuracy.

According to a tenth aspect, a first flat magnetic member and a second flat magnetic member disposed on the first flat magnetic member are provided.
A flat magnetic member, two wiring terminals disposed on side surfaces of the first flat magnetic member, and both ends connected to different wiring terminals, and the first flat magnetic member is connected to the first flat magnetic member. An inductor comprising a band-shaped or string-shaped metal conductor having a portion disposed between the second plate-shaped magnetic member and a portion disposed on the upper surface of the second plate-shaped magnetic member is proposed.

According to the inductor, the metal conductor is disposed between the first and second plate-shaped magnetic members and over the upper surface of the second plate-shaped magnetic member. The length can be set large, and the inductance can be increased even in a small shape.
Further, the inductance value can be arbitrarily set by changing the arrangement and shape of the metal conductor.

An eleventh aspect of the present invention proposes the inductor according to the tenth aspect, wherein a third plate-shaped magnetic member is provided on the second plate-shaped magnetic member.

According to the inductor, by disposing and providing the third flat magnetic member on the second flat magnetic member, almost all of the metal conductor can be sandwiched by the flat magnetic member. Therefore, the inductance value can be increased.

According to a twelfth aspect of the present invention, there is provided the inductor according to the tenth aspect, wherein both ends of the metal conductor form the wiring terminals.

According to the inductor, productivity is improved by making each of the two ends of the metal conductor a wiring terminal.

According to a thirteenth aspect of the present invention, in the inductor according to the tenth aspect, the metal conductor is arranged in a spiral shape having a winding center axis substantially coinciding with a perpendicular to the upper surface of the flat magnetic member. suggest.

According to the inductor, by arranging the metal conductor in a spiral shape having a winding center axis substantially coincident with a perpendicular to the upper surface of the flat magnetic member, a coil is formed to increase the inductance value. Was.

According to a fourteenth aspect of the present invention, there is provided the inductor according to the tenth or eleventh aspect, wherein a nonmagnetic layer is formed at least in a portion other than the metal conductor between at least two plate-shaped magnetic members. .

According to the inductor, since the nonmagnetic layer is formed at least in a portion other than the metal conductor between the at least two plate-like magnetic members, the magnetic field strength causing magnetic saturation is increased, thereby avoiding magnetic saturation. it can.

According to a fifteenth aspect of the present invention, there is provided the inductor according to the tenth or eleventh aspect, wherein one or more flat magnetic members have magnetic properties different from those of the other flat magnetic members. I do.

According to the inductor, the one or more plate-shaped magnetic members have magnetic characteristics different from those of the other plate-shaped magnetic members, so that the inductor simultaneously has two or more different magnetic characteristics. The use of ferrite with high magnetic permeability as the flat magnetic member reduces the loss at high frequencies, and the use of metal compacts or amorphous alloys provides excellent DC superposition characteristics. Can be configured.

According to a sixteenth aspect of the present invention, there is provided the inductor according to the tenth or eleventh aspect, wherein the flat magnetic member is made of a mixture of a magnetic material and a resin.

According to the inductor, since the plate-shaped magnetic member is formed of a mixture of a magnetic material and a resin, easiness of manufacturing and simplification of the manufacturing process are achieved.

According to a seventeenth aspect of the present invention, there is provided the inductor according to the tenth aspect, wherein the metal conductor is formed by stamping a metal plate having a predetermined thickness into a predetermined shape.

According to the inductor, a metal conductor having a predetermined thickness and shape is formed by punching a metal plate having a predetermined thickness to form a metal conductor, thereby improving the accuracy of the inductance value. Was. Further, the conductor resistance of the metal conductor can be adjusted by the punching width, and the work step of winding the conductor can be omitted.

According to claim 18, in the inductor according to claim 10, the metal conductor includes both ends.
An inductor having at least one terminal part and a main part other than the terminal part formed in an arc shape of less than one turn is proposed.

According to the inductor, a metal conductor formed in an arc shape of less than one turn and having two or more terminals including both ends is used as the metal conductor.
Made thin.

According to a nineteenth aspect, in the inductor according to the tenth aspect, a groove for arranging the metal conductor is formed in at least one of the flat magnetic members, and the depth of the groove is greater than the thickness of the metal conductor. Also, an inductor is proposed in which a non-magnetic layer is formed between the two plate-shaped magnetic members due to the difference therebetween.

According to the inductor, a groove for disposing the metal conductor is formed in the flat magnetic member,
The fixing position of the metal conductor at the time of manufacture was made clear. Further, the thickness of the nonmagnetic layer can be adjusted by the difference between the depth of the groove and the thickness of the metal conductor.

According to a twentieth aspect of the present invention, in the inductor according to the tenth aspect, a groove for arranging the metal conductor is formed in at least one of the flat magnetic members, and the depth of the groove is equal to the depth of the metal conductor. Is set to a thickness greater than
An inductor is proposed in which a non-magnetic member constituting the non-magnetic layer is provided between the two flat magnetic members.

According to the inductor, the metal conductor is embedded in the groove, and the thickness of the nonmagnetic layer can be set by the thickness of the nonmagnetic member.

According to a twenty-first aspect of the present invention, two or more wiring conductors formed on the parent circuit board, and a flat magnetic plate disposed on the wiring conductor such that each end of the wiring conductor is exposed. And a metal conductor in the form of one or more bands or strings arranged from the side surface to the upper surface of the plate-shaped magnetic member, and both ends of the metal conductor are connected to different ends of the wiring conductor. Further, an inductor is proposed in which a coil of one or more turns is formed around the magnetic member by the wiring conductor and the metal conductor.

According to the inductor, since the inductor includes the predetermined wiring conductor formed on the parent circuit board to be mounted, the wiring conductor formed on the parent circuit board can be used effectively. Since a coil of one or more turns is formed around the flat magnetic member by the wiring conductor and the metal conductor, a small inductance and a high inductance value can be obtained.

According to a twenty-second aspect of the present invention, in the inductor according to the twenty-first aspect, the two metal conductors are provided, and the flat magnetic member has a square main surface, and each of both ends of one of the metal conductors is provided. Are disposed at the center of each of two adjacent side surfaces of the plate-shaped magnetic member.
An inductor is proposed in which the end of the other metal conductor is arranged at the center of each of two sides different from the one side.

According to the inductor, the main surface of the flat magnetic member is square, and both ends of the two metal conductors are arranged at the center of each of two adjacent side surfaces of the flat magnetic member. Therefore, it is possible to eliminate the directionality at the time of mounting on the parent circuit board.

According to a twenty-third aspect of the present invention, there is provided an inductor according to the twenty-first aspect, wherein the second flat magnetic member is provided on the flat magnetic member.

According to the inductor, the second plate-shaped magnetic member is arranged and provided on the plate-shaped magnetic member.
Further, the inductance value can be increased.

According to a twenty-fourth aspect of the present invention, in the inductor according to the twenty-third aspect, at least a portion other than the metal conductor between the flat magnetic member and the second flat magnetic member facing the main circuit board. An inductor having a non-magnetic layer is proposed.

According to the inductor, since the nonmagnetic layer is formed at least in a portion other than the metal conductor between the flat magnetic member and the second flat magnetic member facing the parent circuit board, the magnetic saturation is reduced. The generated magnetic field intensity increases, and magnetic saturation can be avoided.

According to a twenty-fifth aspect of the present invention, there is provided the inductor according to the twenty-third aspect, wherein the plate-shaped magnetic members have different magnetic characteristics.

According to the inductor, since the two plate-shaped magnetic members have different magnetic properties, the inductor has two different kinds of magnetic properties at the same time.
The use of ferrite with high magnetic permeability as the flat magnetic member reduces the loss at high frequencies, and the use of metal compacts or amorphous alloys provides excellent DC superposition characteristics. Can be configured.

According to a twenty-sixth aspect of the present invention, there is provided an inductor according to the twenty-first or twenty-third aspect, wherein the flat magnetic member is made of a mixture of a magnetic material and a resin.

According to the inductor, the plate-shaped magnetic member is formed of a mixture of a magnetic material and a resin, thereby facilitating manufacture and simplifying the manufacturing process.

According to a twenty-seventh aspect of the present invention, there is provided the inductor according to the twenty-first aspect, wherein the metal conductor is formed by stamping a metal plate having a predetermined thickness into a predetermined shape.

According to the inductor, the precision of the inductance value can be improved by using the metal conductor whose thickness and shape are accurately set by stamping a metal plate having a predetermined thickness. Further, the conductor resistance of the metal conductor can be adjusted by the punching width, and the work step of winding the conductor can be omitted.

According to a twenty-eighth aspect of the present invention, there is provided the inductor according to the twenty-first aspect, wherein the flat magnetic member is provided with a groove for disposing the metal conductor.

According to the inductor, a groove for disposing the metal conductor is formed in the flat magnetic member,
The fixing position of the metal conductor during manufacturing becomes clear.

According to a twenty-ninth aspect, in the inductor according to the twenty-fourth aspect, a groove for arranging the metal conductor is formed in at least one of the plate-shaped magnetic members, and the depth of the groove is smaller than that of the metal conductor. The present invention proposes an inductor which is set to be smaller than the thickness and in which a non-magnetic layer is formed between the two flat magnetic members by the difference between the two.

According to the inductor, a groove for disposing the metal conductor is formed in the flat magnetic member,
The fixing position of the metal conductor at the time of manufacture was made clear. Further, the thickness of the nonmagnetic layer can be adjusted by the difference between the depth of the groove and the thickness of the metal conductor.

According to a thirtieth aspect of the present invention, in the inductor according to the twenty-fourth aspect, a groove for arranging the metal conductor is formed on at least one of the plate-shaped magnetic members, and the depth of the groove is equal to the depth of the metal conductor. Is set to a thickness greater than
An inductor is proposed in which a non-magnetic member constituting the non-magnetic layer is provided between the two flat magnetic members.

According to the inductor, the metal conductor is embedded in the groove, and the thickness of the nonmagnetic layer can be set by the thickness of the nonmagnetic member.

According to a thirty-first aspect of the present invention, a first flat magnetic member having a quadrangular main surface is disposed on an upper surface of the first flat magnetic member, and both ends are adjacent to one another. A first metal conductor in the form of a band or a string arranged on a different side surface, and both ends arranged on the upper surface of the first plate-shaped magnetic member in a non-contact manner with the first metal conductor, A second metal conductor in the form of a band or a string arranged on the other adjacent different side surface, and a second plate-shaped magnetic member disposed on the first plate-shaped magnetic member, Disposed from two opposing side surfaces of the second plate-shaped magnetic member to the upper surface such that each of both ends is connected to a different metal conductor end disposed on a pair of opposed side surfaces of the first plate-shaped magnetic member. And two of the first plate-shaped magnetic members Suggest inductor comprising a third metal conductor forming the strip having a spring property sandwiching surface.

According to the inductor, the second plate-shaped magnetic member is disposed on the first plate-shaped magnetic member having the first and second metal conductors disposed on the upper surface thereof. And one end of each of the second metal conductors is conductively connected by the third metal conductor. Thereby, the first through third
The metal conductor forms a coil that makes one turn around the second flat magnetic member. Further, since the third metal conductor has a spring property, it is easy to fix the third metal conductor to the first and second plate-shaped magnetic members during manufacturing.

Further, the invention according to claim 32 proposes the inductor according to claim 31, wherein the other end portions of the first and second metal conductors are exposed to the outside to serve as wiring terminals.

According to the inductor, the first and second
By exposing the other end of the metal conductor to the outside to serve as a wiring terminal, easiness of manufacture and simplification of the manufacturing process were achieved.

According to a thirty-third aspect, in the inductor according to the thirty-first aspect, the first and second plate-shaped magnetic members have square main surfaces, and end portions of the first and second metal conductors are provided. Proposes an inductor arranged in the center of said side surface.

According to the inductor, the first and second inductors
The main surface of the plate-shaped magnetic member is made square, and the ends of the first and second metal conductors are arranged at the center of the side surface, so that the directionality at the time of manufacturing and mounting on the parent circuit board can be improved. lost.

According to a thirty-fourth aspect of the present invention, there is provided the inductor according to the thirty-first aspect, wherein the first plate-shaped magnetic member is an insulator.

According to the inductor, since the first plate-shaped magnetic member is made of an insulator, a short circuit of the wiring conductor on the parent circuit board can be avoided.

According to a thirty-fifth aspect of the present invention, there is provided the inductor according to the thirty-first aspect, wherein a nonmagnetic layer is formed at least in a portion other than the metal conductor between the first and second plate-shaped magnetic members. .

According to the inductor, the first and the second
By forming the non-magnetic layer at least in a portion other than the metal conductor between the plate-shaped magnetic members, the magnetic field strength causing magnetic saturation is increased, and magnetic saturation can be avoided.

Further, claim 36 proposes the inductor according to claim 31, wherein the first and second plate-shaped magnetic members have different magnetic characteristics from each other.

According to the inductor, the first and second inductors
Since the plate-shaped magnetic members have different magnetic characteristics, the inductor has both different types of magnetic characteristics at the same time. The use of ferrite with high magnetic permeability as the flat magnetic member reduces the loss at high frequencies, and the use of metal compacts or amorphous alloys provides excellent DC superposition characteristics. Can be configured.

Further, the present invention proposes an inductor according to claim 31, wherein the plate-shaped magnetic member is made of a mixture of a magnetic material and a resin.

According to the inductor, the plate-shaped magnetic member is formed of a mixture of a magnetic material and a resin, thereby facilitating manufacture and simplifying the manufacturing process.

According to a thirty-eighth aspect of the present invention, there is provided the inductor according to the thirty-first aspect, wherein the metal conductor is formed by stamping a metal plate having a predetermined thickness into a predetermined shape.

According to the inductor, the precision of the inductance value is increased by using the metal conductor whose thickness and shape are accurately set by punching a metal plate having a predetermined thickness. Further, the conductor resistance of the metal conductor can be adjusted by the punching width, and the work step of winding the conductor can be omitted.

Further, claim 39 proposes the inductor according to claim 31, wherein the flat magnetic member is formed with a groove for disposing the metal conductor.

According to the inductor, a groove for disposing the metal conductor is formed in the plate-shaped magnetic member so that the fixing position of the metal conductor at the time of manufacturing is clear.

According to claim 40, in the inductor according to claim 31, a groove for disposing the first and second metal conductors is formed in at least one of the first and second plate-shaped magnetic members. An inductor is proposed in which a non-magnetic layer is formed between the first and second plate-shaped magnetic members due to the difference between the two.

According to the inductor, a groove for disposing the metal conductor is formed in the flat magnetic member,
The fixing position of the metal conductor at the time of manufacture was made clear. Further, the thickness of the nonmagnetic layer can be adjusted by the difference between the depth of the groove and the thickness of the metal conductor.

According to claim 41, in the inductor according to claim 31, a groove for disposing the first and second metal conductors is formed in at least one of the first and second plate-shaped magnetic members. The depth of the groove is set to be equal to or greater than the thickness of the metal conductor, and a non-magnetic member constituting the non-magnetic layer is provided between the first and second plate-shaped magnetic members. A new inductor.

According to the inductor, a groove for disposing the metal conductor is formed in the flat magnetic member,
The fixing position of the metal conductor at the time of manufacture was made clear. Further, since the metal conductor is embedded in the groove, the thickness of the non-magnetic layer can be set according to the thickness of the non-magnetic member.

Further, according to claim 42, there is provided an inductor having a band-shaped or string-shaped metal conductor sandwiched between plate-shaped magnetic members and a non-magnetic layer formed at least in a portion other than the metal conductor between the plate-shaped magnetic members. A manufacturing method, wherein a step of bonding a strip-shaped or string-shaped metal conductor to the main surface of the plate-shaped magnetic member, and another plate-shaped magnetic member sandwiching the metal conductor on the main surface side of the plate-shaped magnetic member And a method of forming an inductor by bending both ends of the metal conductor to form wiring terminals.

According to the method of manufacturing an inductor, an inductor can be manufactured by bonding a band-shaped or string-shaped metal conductor between flat magnetic members, and bending both ends as wiring terminals. Further, the adhesive layer substantially corresponding to the thickness of the metal conductor becomes the non-magnetic layer.

Further, according to the present invention, there is provided an inductor in which a non-magnetic layer is formed at least in a portion other than the metal conductor between the plate-shaped magnetic members with a band-shaped or string-shaped metal conductor sandwiched between the plate-shaped magnetic members. A manufacturing method, wherein a band or a string-shaped metal conductor is covered with a resin formed by molding a predetermined portion except for both ends into a flat plate, and a step of covering upper and lower surfaces of the flat resin with a mixture of resin and a magnetic material. Forming a wiring terminal by bending both ends of the metal conductor.

According to the method for manufacturing an inductor, a predetermined portion excluding an end of a metal conductor processed into a predetermined pattern shape is covered with a resin, and the resin is molded into a flat plate shape.
The non-magnetic layer is formed. Further, by covering the upper and lower surfaces of the flat resin with a mixture of a resin and a magnetic material, a flat magnetic member sandwiching the nonmagnetic layer is formed. Further, by bending both ends of the metal conductor, wiring terminals are formed, and an inductor is manufactured.

[0096]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing an inductor according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.
In the figure, reference numeral 10 denotes an inductor, and two flat magnetic members (hereinafter, referred to as magnetic members) 1 each having a square main surface.
A strip-shaped metal conductor 13 is sandwiched between the first and second metal conductors 12. These two magnetic members 11 and 12 are bonded using a resin 14. Both ends of the metal conductor 13 are exposed to the outside and bent into a predetermined shape to form wiring terminals.

Each of the magnetic members 11 and 12 has, for example, a thickness of 0.5 mm to 1.0 mm and a side of 5 mm to 15 m.
m of a ferrite plate. The metal conductor 13 is made of, for example, copper having a thickness of 100 μm and a width of 1 mm to 2 mm.

The inductor 10 was manufactured as follows.

That is, both ends of the strip-shaped metal conductor 13 obtained by stamping a copper plate having the above-mentioned thickness are bent in accordance with the shape of the magnetic member 11 to be the lower plate and the arrangement of the metal conductor 13 to form a wiring. Form terminals. This metal conductor 13 is made of a lower plate magnetic member 11 by using, for example, an epoxy resin 14.
Glue to

Next, the magnetic member 12 serving as the upper plate is
Is used to adhere to the upper main surface of the magnetic member 11. After this,
The resin 14 is cured by drying at a temperature of 150 to 200 degrees. Thereby, the inductor 10 is completed.

According to the inductor 10 having the above structure, a gap is formed between the two magnetic members 11 and 12 by the thickness of the metal conductor 13 by sandwiching the metal conductor 13 between the magnetic members 11 and 12. The resin 14 is filled and becomes a non-magnetic layer.

The non-magnetic layer increases the magnetic field intensity at which magnetic saturation occurs, so that magnetic saturation can be avoided.

Further, both ends of the metal conductor 13 are connected to the magnetic member 1.
Since the wiring terminals are exposed to the outside from the gap between the first and second wirings, the manufacturing process can be simplified. In addition, since the band-shaped metal conductor 13 having a relatively large sectional area is used,
In addition to being easy to manufacture, the DC resistance can be reduced and a large inductance value can be obtained.

In this embodiment, the two magnetic members 11 and
Although a ferrite plate having the same magnetic characteristics is used as 12, two flat magnetic members 11 and 12 having different magnetic characteristics are used.
, An inductor having both these two magnetic characteristics can be formed. For example, when ferrites having high magnetic permeability are used as the plate-shaped magnetic members 11 and 12, loss at high frequencies is reduced, and when metal powder or an amorphous alloy is used, DC superimposition characteristics are excellent. An inductor having both characteristics can be configured.

As will be described later, the flat magnetic member 1
By forming 1 and 12 from a mixture of a resin and a magnetic material, the manufacturing process can be further simplified.

Further, two flat magnetic members 11 and 12
The inductance value can be arbitrarily set by changing the arrangement and shape of the metal conductor 13 between them.

For example, as shown in FIGS. 3 to 6, the metal conductors 13A, 13A,
13B (FIGS. 3 and 4) or the magnetic member 11,
By using the metal conductors 13C and 13D having a circular shape between the two (FIGS. 5 and 6), the inductance value can be set arbitrarily.

Further, as shown in FIG.
Metal conductor 13E provided with one or more terminal portions 13a to 13c
By using any two terminals, three different types of inductances can be used.

When the metal conductors 13 are manufactured, a metal plate is punched to form the metal conductors 13.
Since the shape of No. 3 can be set in detail, a desired inductance value can be easily obtained. Furthermore, the conductor resistance of the metal conductor 13 can be adjusted by the punching width, and the operation step of winding the conductor can be omitted.

As shown in FIG. 8, the metal conductor 13E
May be formed in the flat magnetic member 11. By forming the groove 11a in this way, the fixing position of the metal conductor at the time of manufacturing can be clarified, and the arrangement position of the metal conductor can be unified.
This makes it possible to maintain constant inductor characteristics when a large number of inductors of the same standard are manufactured. The metal conductor 13E is larger than the depth of the groove 11a of the flat magnetic member 11.
The thickness of the groove 11a and the depth of the metal conductor 13
It is also possible to adjust the thickness of the nonmagnetic layer according to the difference from the thickness of E.

As shown in FIG. 9, a metal conductor 13E may be buried in the groove 11a, and a non-magnetic layer may be formed between the flat magnetic members 11 and 12 with a non-magnetic material sheet 15 interposed therebetween.

As the metal conductor 13, phosphor bronze, iron, or the like may be used instead of copper.

Next, a second embodiment of the present invention will be described.

FIG. 10 is an external perspective view showing an inductor according to a second embodiment of the present invention, and FIG. 11 is an exploded perspective view thereof. In the drawing, reference numeral 20 denotes an inductor, and two flat magnetic members having a square main surface (hereinafter referred to as magnetic members).
21 and 22, a metal conductor 23, and a resin 24 for bonding them.

Each of the magnetic members 21 and 22 has a thickness of 0.5 mm to 1.0 mm, for example, as in the first embodiment.
And a ferrite plate having one side of 5 mm to 15 mm. The metal conductor 23 has, for example, a thickness of 100 μm and a width of 1 μm.
It is made of copper having a size of 2 mm to 2 mm, and is formed continuously in a shape as if two substantially circular portions were connected at a predetermined position.

One circular portion of the metal conductor 23 is sandwiched between the two magnetic members 21 and 22 using a resin. Further, the other circular portion of the metal conductor 23 is bent at the connection portion, is disposed on the upper surface of the magnetic member 21 of the upper plate so as to substantially overlap the other circular portion, and is bonded to the magnetic member 22 using resin. I have.

Here, the winding directions of the one circular portion and the other circular portion of the metal conductor 23 are set in the same direction.

Further, each of both ends of the metal member 23 is bent into a predetermined shape to form a wiring terminal.

Next, a method for manufacturing the inductor 20 will be described with reference to FIG.

First, a metal conductor 23 having two circular portions as shown in FIG. 12A is formed, and a resin is applied to one circular portion disposed on the upper surface of the magnetic member 22 of the upper plate. It is bonded to the magnetic member 22 (FIG. 12B).

Next, a resin is applied to the other circular portion of the metal conductor 23 and bent, and the magnetic member 22 is overlapped and adhered to the other main surface (FIG. 12C).

Next, a resin is applied to the other main surface of the magnetic member 22 and the other circular portion of the metal conductor 23, and the other magnetic member 21 is adhered. Then, both ends of the metal conductor 23 are bent to form wiring terminals. (FIG. 12D).

Thereafter, the inductor 20 is dried at a temperature of 150 to 200 degrees and the resin 24 is cured.
Is completed.

According to the inductor 20 having the above configuration, a two-turn coil is formed by the two substantially circular portions of the metal conductor 23 disposed between the magnetic members 21 and 22 and on the upper surface of the magnetic member 22. Value can be obtained.

Further, by sandwiching the metal conductor 23 between the two magnetic members 21 and 22, a gap is formed between the two magnetic members 21 and 22 by the thickness of the metal conductor 23, and the resin 24 is filled in the gap. Since the non-magnetic layer is formed in the state, the magnetic field intensity causing magnetic saturation is increased, and magnetic saturation can be avoided.

Further, both ends of the metal conductor 23 are connected to the magnetic member 2.
Since the wiring terminal is exposed to the outside from the gap between the first and second wirings, the manufacturing process can be simplified. In addition, since the band-shaped metal conductor 23 having a relatively large cross-sectional area is used, it is easy to manufacture, the DC resistance can be reduced, and a large inductance value can be obtained.

In this embodiment, the two magnetic members 21 and
Although a ferrite plate having the same magnetic characteristics is used as 22, two flat magnetic members 21 and 22 having different magnetic characteristics are used.
, An inductor having both these two magnetic characteristics can be formed.

Also, as in the inductor 20A shown in FIGS. 13 and 14, a substantially circular portion formed by the metal conductor 20A is formed in an arc shape to form a coil having an arbitrary number of turns such as 1.5 turns. Can be.

Also, by forming the metal conductor 23B in the shape shown in FIG. 16, for example, as shown in FIG. 16, the directions of the magnetic fluxes are different from each other by bending and overlapping, as in the inductor 20B shown in FIG. Two coils can be formed side by side.

Next, a third embodiment of the present invention will be described.

FIG. 17 is an external perspective view showing an inductor according to a third embodiment of the present invention, and FIG. 18 is an exploded perspective view thereof. In the figure, the same components as those of the above-described second embodiment are denoted by the same reference numerals, and description thereof will be omitted. Also,
The difference between the second embodiment and the third embodiment is that a flat plate-shaped magnetic member 31 is further disposed on the magnetic member 22 and bonded by a resin 32 so as to sandwich the metal conductor 23.

As a result, almost all portions of the metal conductor 23 are sandwiched between the magnetic members 21, 22, 31.
The magnetic path length around the metal conductor 23 is reduced, and a larger inductance value can be obtained.

Next, a fourth embodiment of the present invention will be described.

FIG. 19 is an external perspective view showing an inductor according to a fourth embodiment of the present invention, and FIG. 20 is an exploded perspective view thereof. In the figure, reference numeral 40 denotes an inductor;
Are formed from two wiring conductors 42, 43, a flat magnetic member 44, and a metal conductor 45 arranged on the upper surface of the magnetic member 44.

As in the first embodiment, the magnetic member 44 has a thickness of 0.5 mm to 1.0 mm and a side of 5 mm to 15 m.
m of a ferrite plate. The metal conductor 45 is made of copper having a thickness of 100 μm and a width of 1 mm to 2 mm, and is formed in a one-shape.

The metal conductor 45 is adhered to the upper surface of the magnetic member 44 by using a resin with both ends arranged at the center of each of two opposing side surfaces of the magnetic member 44.

Further, each of both ends of the metal member 45 is bent into a predetermined shape to form a wiring terminal.
These wiring terminals are conductively connected to respective ends 42a and 43a of the wiring conductors 42 and 43 using solder or the like.

The wiring conductors 42 and 43 are formed so as to extend in the direction of the corners of the magnetic member 44 from the respective ends 42a and 43a so as to be substantially parallel to each other.
As a result, a one-turn coil wound around the magnetic member 44 by the wiring conductors 42 and 43 and the metal conductor 45 is formed.

According to the inductor 40 having the above-described configuration, the inductor 40 includes the wiring conductors 42 and 43 formed on the parent circuit board 41 to be mounted. Wiring conductors 42, 43
Can be effectively used, and since a one-turn coil is formed around the magnetic member 44 by the wiring conductors 42 and 43 and the metal conductor 45, a thin shape and a high inductance value can be obtained.

In the above configuration, the metal conductor 45 is arranged between the central portions of the opposing side surfaces of the magnetic member 44. However, as in the inductor 40A shown in FIG. A metal conductor 45A having a predetermined shape may be used. In this case, the wiring conductor 42 on the parent circuit board 41
If A and 43A are arranged below the bottom surface of the magnetic member 44, a large inductance value can be obtained.

As shown in FIG. 22, an inductor 40B has two metal conductors 46A and 46A on a magnetic member 44.
Even if B is arranged and a wiring conductor 47 connecting the metal conductors 46A and 46B in series is formed below the bottom surface of the magnetic member 44, an inductor similar to the above can be formed.
That is, the two metal conductors 46A and 46B are arranged near two opposing side surfaces of the magnetic member 44 and substantially parallel to the side surfaces. Thereby, each metal conductor 46
Both ends of A and 46B are located near the corners of the magnetic member 44. That is, one end of one metal conductor 46 is connected to the wiring conductor 43B.
The other end of the other metal conductor 46B is connected to the wiring conductor 4B.
2B. Also, one end 47 of the wiring conductor 47
a is connected to one end of the other metal conductor 46B, and the other end 47b of the wiring conductor 47 is connected to the other end of one metal conductor 46A.

As described above, by providing two or more metal conductors on the upper surface of the magnetic member 44, it is possible to easily form a coil having a plurality of turns.

Further, two metal conductors 48A and 48B are provided like an inductor 40C shown in FIG.
And metal conductors 48A, 4A between substantially central portions of adjacent side surfaces of
By arranging the 8B, it is possible to eliminate the directionality at the time of mounting on the parent circuit board 41. That is, one metal conductor 48A is disposed between two adjacent two side surfaces of the magnetic member 44, and the other metal conductor 48B is disposed between the other adjacent two side surfaces of the magnetic member 44.

The magnetic member 44 is provided on the parent circuit board 41.
A pair of wiring conductors 42C and 43C having ends arranged substantially at the center of the pair of opposed side surfaces, and a single-shaped wiring having both ends arranged substantially at the center of the other pair of opposed side surfaces of the magnetic member 44. A conductor 49 is formed. One end 49a of the wiring conductor 49 is connected to one end of one metal conductor 48A, and the other end 49b is connected to one end of the other metal conductor 48B. The other ends of the metal conductors 48A and 48B are connected to wiring conductors 42C and 43C.

As described above, by forming the main surface of the magnetic member 44 into a square shape and forming the metal conductors 48A and 48B and the wiring conductors 42C, 43C and 49 as described above, the magnetic member 44 can be mounted on the parent circuit board 41. It can be mounted even if the 44 is rotated, and automatic mounting can be easily performed.

Next, a fifth embodiment of the present invention will be described.

FIG. 24 is an external perspective view showing an inductor according to a fifth embodiment of the present invention. In the figure, the same components as those of the above-described fourth embodiment are denoted by the same reference numerals, and description thereof will be omitted. A difference between the fourth embodiment and the fifth embodiment is that a flat plate-shaped magnetic member 51 is further disposed on the magnetic member 44 and bonded by a resin 52 so as to sandwich the metal conductor 45. .

As a result, almost all portions of the metal conductor 45 are sandwiched between the magnetic members 44 and 51, so that the magnetic path length around the metal conductor 45 is shortened, and a larger inductance value can be obtained.

In this case as well, ferrite plates having the same magnetic characteristics are used as the two magnetic members 44 and 51. However, by using two flat magnetic members 44 and 51 having different magnetic characteristics, these two magnetic characteristics are used. Can be formed.

Next, a sixth embodiment of the present invention will be described.

FIG. 25 is an external perspective view showing an inductor according to a sixth embodiment, and FIG. 26 is an exploded perspective view thereof. In the figure, reference numeral 60 denotes an inductor, which is composed of flat magnetic members 61 and 62 having a square main surface, metal conductors 63 and 64, and a metal conductor 65 having a substantially U-shaped spring characteristic.

The magnetic members 61 and 62 have a thickness of 0.5 mm.
It is made of a ferrite plate having an insulating property of about 1.0 mm and one side of 5 mm to 15 mm.

The metal conductors 63 and 64 have a thickness of 10
It is made of copper having a thickness of 0 μm and a width of 1 mm to 2 mm, and the shape is the same as that of the inductor 40C shown in FIG. 23. These are similarly arranged on the upper surface of the magnetic member 61, and are adhered to the magnetic member 61 by resin. I have.

On the magnetic member 61, metal conductors 63, 64
Are sandwiched by the magnetic member 62. Further, a metal conductor 65 is fitted from above so as to electrically connect one end of each of the metal conductors 63 and 64.
The metal conductor 65 allows the magnetic member 62 to
3 and 64 are fixed.

According to the inductor 60 having the above configuration, one ends of the two metal conductors 63 and 64 are conductively connected by the metal conductor 65 having a spring property, and the magnetic members 62 are formed by the metal conductors 63, 64 and 65. Is formed around the periphery of the coil for approximately one turn.

Further, since the metal conductor 65 has a spring property, it is easy to fix the magnetic member 62 of the upper plate and the metal conductor 65 itself during manufacturing.

Further, since the ends of the metal conductors 63 and 64 are exposed to be used as wiring terminals, easiness of manufacturing and simplification of the manufacturing process can be achieved.

The main surfaces of the plate-shaped magnetic members 61 and 62 are square, and the ends of the metal conductors 63 and 64 are connected to the magnetic member 61.
Since it is arranged at the center of the side surface of the device, the directivity at the time of manufacturing and at the time of mounting on the parent circuit board can be eliminated.

Since the nonmagnetic layer is formed between the two magnetic members 61 and 62 due to the thickness of the metal conductors 63 and 64, the magnetic field strength causing magnetic saturation is increased, and magnetic saturation can be avoided.

As described above, by giving the two magnetic members 61 and 62 different magnetic characteristics, it becomes an inductor having two different types of magnetic characteristics simultaneously.

Next, a seventh embodiment of the present invention will be described.

In the seventh embodiment, the plate-like magnetic members 11 and 12 of the inductor 10 of the first embodiment are formed of a mixture of a resin (epoxy resin or the like) and a magnetic material (ferrite powder or the like). The manufacturing method will be described.

FIG. 27 is a view for explaining a method of manufacturing the inductor according to the seventh embodiment.

In the manufacturing method of this embodiment, as shown in FIG. 27A, a frame lead was used as the metal conductor 71. Metal conductor 71 made of this frame lead
Is covered with a resin 72 by injection molding, and the resin 72 is formed into a square flat plate (FIG. 27 (b)). Further, a mixture of resin and a magnetic material is formed on the upper and lower surfaces of the resin 72 by injection molding. Plate-shaped magnetic members 73 and 74 each having a predetermined thickness and forming a square are formed (FIG. 27C). Here, the magnetic members 73 and 74 were formed of a mixture of an epoxy resin and ferrite powder.

After that, the exposed end of the metal conductor 71 is cut to a predetermined length, and further bent to form a wiring terminal 75 (FIG. 27D). Thus, the plate-shaped inductor 76 is completed.

According to the above-described method of manufacturing an inductor, an inductor can be formed without winding a conductive wire around a core as in the related art. The thickness of the inductor 76 is
Since the thickness of the two magnetic members 73 and 74 is equal to the thickness of the metal conductor 71, the thickness of the magnetic members 73 and 74 is kept small, so that a thin inductor 76 can be easily manufactured.

Further, by changing the pattern shape of the metal conductor 71 within a limited area, a larger inductance can be obtained effectively.

Further, since the non-magnetic layer is formed between the two flat magnetic members 73 and 74 by molding the resin 72 into a flat plate shape, the magnetic field strength causing magnetic saturation is increased and magnetic saturation is avoided. Can be.

The embodiments described above are merely specific examples of the present invention, and the present invention is not limited to these embodiments. For example, it goes without saying that a thin inductor can be formed in which substantially the same effects can be obtained by combining the embodiments.

Also, in the second to seventh embodiments, the groove for disposing the metal conductor may be formed in the flat magnetic member. Further, the non-magnetic layer may be formed using a non-magnetic material sheet.

[0172]

As described above, according to the inductor of the present invention, a thin power supply can be realized by using the inductor as an output smoothing inductor of a CPU core power supply. It can sufficiently satisfy the demand for thin electronic devices such as personal computers, and greatly contributes to the development of industry. further,
Since the structure is relatively simple, it is possible to reduce the manufacturing cost, which can greatly contribute to the cost reduction of electronic equipment.

According to the method for manufacturing an inductor according to the present invention, since it is easy to mold the inductor into a desired shape, an inductor having an inductance value according to a demand can be easily manufactured at low cost. be able to. Furthermore, an inductor having a thin shape and a small size can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an inductor according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the inductor according to the first embodiment of the present invention.

FIG. 3 is a view showing another shape of the metal conductor according to the first embodiment of the present invention;

FIG. 4 is a diagram showing another shape of the metal conductor according to the first embodiment of the present invention.

FIG. 5 is a diagram showing another shape of the metal conductor according to the first embodiment of the present invention.

FIG. 6 is a diagram showing another shape of the metal conductor according to the first embodiment of the present invention.

FIG. 7 is a view showing another shape of the metal conductor according to the first embodiment of the present invention;

FIG. 8 is a view showing grooves of a flat magnetic member according to the first embodiment of the present invention.

FIG. 9 is a view showing another method for forming the nonmagnetic layer according to the first embodiment of the present invention;

FIG. 10 is an external perspective view showing an inductor according to a second embodiment of the present invention.

FIG. 11 is an exploded perspective view showing an inductor according to a second embodiment of the present invention.

FIG. 12 is a diagram illustrating a method for manufacturing an inductor according to a second embodiment of the present invention.

FIG. 13 is a plan view showing another inductor according to the second embodiment of the present invention.

FIG. 14 is an exploded plan view showing another inductor according to the second embodiment of the present invention.

FIG. 15 is a plan view showing another inductor according to the second embodiment of the present invention.

FIG. 16 is a plan view showing another shape of the metal conductor according to the second embodiment of the present invention.

FIG. 17 is an external perspective view showing an inductor according to a third embodiment of the present invention.

FIG. 18 is an exploded perspective view showing an inductor according to a third embodiment of the present invention.

FIG. 19 is an external perspective view showing an inductor according to a fourth embodiment of the present invention.

FIG. 20 is an exploded perspective view showing an inductor according to a fourth embodiment of the present invention.

FIG. 21 is an external perspective view showing another inductor according to the fourth embodiment of the present invention.

FIG. 22 is an external perspective view showing another inductor according to the fourth embodiment of the present invention.

FIG. 23 is an external perspective view showing another inductor according to the fourth embodiment of the present invention.

FIG. 24 is an external perspective view showing an inductor according to a fifth embodiment of the present invention.

FIG. 25 is an external perspective view showing an inductor according to a sixth embodiment of the present invention.

FIG. 26 is an exploded perspective view showing an inductor according to a sixth embodiment of the present invention.

FIG. 27 is a diagram illustrating a method of manufacturing the inductor according to the seventh embodiment of the present invention.

[Explanation of symbols]

10, 20, 20A, 20B, 30, 40, 40A to 4
0C, 50, 60... Inductor, 11, 12, 21, 2.
2,31,44,51,61,62 ... flat magnetic member,
13, 13A to 13D, 23, 45, 45A, 46A,
46B, 48A, 48B, 63, 64: metal conductor, 1
4, 24, 32, 52 ... resin, 15 ... non-magnetic material sheet, 41 ... parent circuit board, 42, 42A to 42C, 43,
43A to 43C, 47, 49,..., A wiring conductor, and 65, a metal conductor.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 41/04 H01F 41/04 B (72) Inventor Masao Igarashi 6-16-20 Ueno, Taito-ku, Tokyo Within Taiyo Denki Co., Ltd. (72) Inventor Satoru Satoshi Inagi 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Denki Co., Ltd.

Claims (43)

[Claims] A metal conductor having a predetermined length is sandwiched between first and second plate-like magnetic members, and a non-magnetic layer is formed at least between the two plate-like magnetic members except for the metal conductor. An inductor characterized in that: 2. The terminal according to claim 1, wherein the metal conductor has two or more terminals including both ends, and the terminals are exposed to the outside to serve as wiring terminals. Inductor. 3. The inductor according to claim 1, wherein the metal conductor has a band shape or a string shape. 4. The inductor according to claim 1, wherein said metal conductor is disposed so as to meander substantially between two plate-shaped magnetic members. 5. The inductor according to claim 1, wherein the plate-shaped magnetic member is made of a mixture of a magnetic material and a resin. 6. The inductor according to claim 1, wherein the first and second plate-shaped magnetic members have different magnetic characteristics. 7. A groove for arranging the metal conductor is formed in at least one of the plate-shaped magnetic members, and the depth of the groove is set smaller than the thickness of the metal conductor. The inductor according to claim 1, wherein a non-magnetic layer is formed between the magnetic members. 8. A groove for disposing the metal conductor is formed in at least one of the plate-shaped magnetic members, and the depth of the groove is set to be equal to or greater than the thickness of the metal conductor.
2. The inductor according to claim 1, wherein a non-magnetic member constituting the non-magnetic layer is interposed between two flat magnetic members. 9. The inductor according to claim 1, wherein the metal conductor is formed by punching a metal plate having a predetermined thickness into a predetermined shape. 10. A first flat magnetic member, a second flat magnetic member arranged on the first flat magnetic member, and a side surface of the first flat magnetic member The two wiring terminals are connected to different wiring terminals at both ends, and a portion disposed between the first plate-shaped magnetic member and the second plate-shaped magnetic member is connected to the second terminal. An inductor comprising a band-shaped or string-shaped metal conductor having a portion disposed on an upper surface of a flat magnetic member. 11. A third plate is provided on the second flat magnetic member.
11. The inductor according to claim 10, wherein the flat plate-shaped magnetic member is arranged and provided. 12. The wiring terminal according to claim 10, wherein both ends of said metal conductor form said wiring terminals.
The inductor as described. 13. The inductor according to claim 10, wherein the metal conductor is arranged in a spiral shape having a winding center axis substantially coinciding with a perpendicular to the upper surface of the flat magnetic member. 14. The inductor according to claim 10, wherein a nonmagnetic layer is formed at least in a portion other than the metal conductor between at least two plate-shaped magnetic members. 15. The inductor according to claim 10, wherein one or more plate-shaped magnetic members have magnetic properties different from those of the other plate-shaped magnetic members. 16. The inductor according to claim 10, wherein the flat magnetic member is made of a mixture of a magnetic material and a resin. 17. The inductor according to claim 10, wherein the metal conductor is formed by punching a metal plate having a predetermined thickness into a predetermined shape. 18. The metal conductor has two or more terminals including both ends, and a main part other than the terminals is formed in an arc shape of less than one turn. 10. The inductor according to 10. 19. A groove for disposing the metal conductor is formed in at least one of the flat magnetic members, and the depth of the groove is set to be smaller than the thickness of the metal conductor. The inductor according to claim 10, wherein a nonmagnetic layer is formed between the magnetic members. 20. A groove for disposing the metal conductor is formed in at least one of the flat magnetic members,
The depth of the groove is set to be equal to or greater than the thickness of the metal conductor, and a non-magnetic member constituting the non-magnetic layer is provided between the two flat magnetic members. Item 10. The inductor according to item 10. 21. Two or more wiring conductors formed on a parent circuit board; a flat magnetic member disposed on the wiring conductor such that each end of the wiring conductor is exposed; And one or more strips or string-shaped metal conductors arranged from the side to the top of the magnetic member. Each of both ends of the metal conductor is connected to a different end of the wiring conductor to form the wiring conductor. An inductor, wherein a coil of one or more turns is formed around the magnetic member by a metal conductor. 22. A semiconductor device comprising two metal conductors, wherein the flat magnetic member has a square main surface, and both ends of one of the metal conductors are connected to two adjacent side surfaces of the flat magnetic member. 22. The inductor according to claim 21, wherein an end of the other metal conductor is arranged at a central portion of each of two side surfaces different from the two side surfaces and arranged at the respective central portions. 23. The apparatus according to claim 2, wherein a second flat magnetic member is provided on the flat magnetic member.
2. The inductor according to 1. 24. A non-magnetic layer is formed at least in a portion other than the metal conductor between a flat magnetic member facing the parent circuit board and the second flat magnetic member. The inductor according to claim 23. 25. The inductor according to claim 23, wherein the flat magnetic members have different magnetic characteristics. 26. The inductor according to claim 21, wherein the flat magnetic member is made of a mixture of a magnetic material and a resin. 27. The inductor according to claim 21, wherein the metal conductor is formed by punching a metal plate having a predetermined thickness into a predetermined shape. 28. The inductor according to claim 21, wherein a groove for disposing the metal conductor is formed in the flat magnetic member. 29. A groove for arranging the metal conductor is formed in at least one of the flat magnetic members, and the depth of the groove is set smaller than the thickness of the metal conductor.
25. The inductor according to claim 24, wherein a non-magnetic layer is formed between the two plate-shaped magnetic members by these differences. 30. A groove for arranging the metal conductor is formed in at least one of the flat magnetic members, and the depth of the groove is set to be equal to or greater than the thickness of the metal conductor. 25. The inductor according to claim 24, wherein a non-magnetic member constituting the non-magnetic layer is provided between the plate-shaped magnetic members. 31. A first flat magnetic member having a quadrangular main surface, and disposed on an upper surface of the first flat magnetic member, and both ends are disposed on one adjacent different side surface. A first metal conductor in the form of a band or a string, and disposed on the upper surface of the first plate-shaped magnetic member in a non-contact manner with respect to the first metal conductor, and both ends are adjacent to each other. A second metal conductor in the form of a band or a string arranged on a different side surface; a second plate-shaped magnetic member provided on the first plate-shaped magnetic member; The first plate-shaped magnetic member is arranged from two opposing side surfaces to an upper surface thereof so as to be connected to different metal conductor ends disposed on a pair of opposing side surfaces of the first plate-shaped magnetic member. 2 of flat magnetic members
An inductor comprising: a band-shaped third metal conductor having a spring property sandwiching two side surfaces. 32. The inductor according to claim 31, wherein the other end portions of the first and second metal conductors are exposed to the outside and serve as wiring terminals. 33. The first and second plate-shaped magnetic members have square main surfaces, and the ends of the first and second metal conductors are arranged at the center of the side surfaces. 32. The inductor according to claim 31. 34. The inductor according to claim 31, wherein the first plate-shaped magnetic member is an insulator. 35. The inductor according to claim 31, wherein a nonmagnetic layer is formed at least in a portion other than the metal conductor between the first and second plate-shaped magnetic members. 36. The inductor according to claim 31, wherein the first and second plate-shaped magnetic members have different magnetic characteristics. 37. The inductor according to claim 31, wherein the flat magnetic member is made of a mixture of a magnetic material and a resin. 38. The inductor according to claim 31, wherein the metal conductor is formed by stamping a metal plate having a predetermined thickness into a predetermined shape. 39. The inductor according to claim 31, wherein a groove for disposing the metal conductor is formed in the plate-shaped magnetic member. 40. A groove for arranging the first and second metal conductors is formed in at least one of the first and second plate-shaped magnetic members, and the first and second plate-shaped magnetic members are formed by a difference therebetween. The inductor according to claim 31, wherein a nonmagnetic layer is formed between the members. 41. A groove for arranging the first and second metal conductors is formed in at least one of the first and second plate-shaped magnetic members, and the depth of the groove is equal to that of the metal conductor. 32. The inductor according to claim 31, wherein a non-magnetic member constituting the non-magnetic layer is provided between the first and second plate-shaped magnetic members so as to have a thickness greater than or equal to the thickness. 42. A method of manufacturing an inductor, wherein a band-like or string-like metal conductor is sandwiched between plate-like magnetic members, and a non-magnetic layer is formed at least in a portion other than the metal conductor between the plate-like magnetic members. Bonding a strip-shaped or string-shaped metal conductor to the main surface of the flat magnetic member; and bonding another flat magnetic member to the main surface side of the flat magnetic member so as to sandwich the metal conductor. Forming a wiring terminal by bending both ends of the metal conductor. 43. A method of manufacturing an inductor, wherein a band-shaped or string-shaped metal conductor is sandwiched between plate-shaped magnetic members, and a non-magnetic layer is formed at least in a portion other than the metal conductor between the plate-shaped magnetic members. A step of covering a predetermined portion excluding both ends of the band-shaped or string-shaped metal conductor with a resin molded into a plate shape; a step of covering upper and lower surfaces of the plate-shaped resin with a mixture of resin and a magnetic material; Forming a wiring terminal by bending both end portions.