JP2002134330A - Coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil component having a magnetic core of superior magnetic characteristics and a complicated shape. SOLUTION: The back leg section 4 and outer leg sections 5 of this coil component are formed, in such a way that the angles between the adjacent surfaces of the sections 4 and 5 are adjusted to be >=90 deg., and at the same time, the angles between the outer peripheral surfaces of the sections 5 and 4 which intersect each other are also adjusted to be >=90 deg.. In addition, a middle leg section 6 is successively arranged from the back leg section 4, with the section 6 being positioned between the outer leg sections 5, and the angles between the adjacent surfaces of the section 6 are also adjusted to be >=90 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component used for consumer or industrial electronic equipment.

[0002]

2. Description of the Related Art Conventionally, coil components used in electronic devices include ferrite, silicon steel plate, amorphous,
An alloy-based dust core or the like is used.

[0003] For example, as a choke coil of a coil component used in a conventional electronic device, FIGS.
Such a structure is used.

FIGS. 18, 19 and 20 are perspective views of a conventional choke coil, respectively.

In FIG. 1, reference numeral 100 denotes an EE type core having a gap in a middle magnetic leg, 105 denotes a magnetic gap, 101 denotes a coil, 102 denotes a toroidal core, 103 denotes a coil, 1
Reference numeral 04 denotes an EE-type core without a gap.

The ferrite or silicon steel plate is used as a core material in FIG. 18, and an EE type core having a magnetic gap 105 formed on a middle magnetic leg is abutted, and a coil 101 is wound around the middle magnetic leg. Thus, a choke coil as a coil component is configured.

In the case where a ferrite material is used as a core, the magnetic flux saturation density of the ferrite material is about 0.3 even at room temperature.
Since it is relatively small, such as 5T, the choke coil has a disadvantage of being large.

The one using a silicon steel sheet as a core has a high magnetic flux saturation density of 1.5 to 2.0 T, but has a very large loss in a high frequency range, so that the choke coil becomes large. There are drawbacks.

In particular, the one provided with such a gap 105 has a fatal drawback that vibration occurs in the gap 105 during operation, causing a problem of howling as a choke coil.

As a toroidal core 102 as shown in FIG. 19 which solves these disadvantages, a part of the Fe-based amorphous is crystallized to give an appropriate distortion to the Fe-based amorphous to improve the effective magnetic permeability. A choke coil is formed by winding a coil 103 using a reduced foil body amorphous body or a dust core obtained by molding FeAlSi, FeNi, or amorphous powder at a high pressure as a core material.

Since these core materials have a relatively high magnetic flux saturation density of 0.8 to 1.5 T and a relatively low magnetic loss, they are generally 1/2 to 1/3 of those of ferrite materials.
It has the advantage that it can be downsized to a certain extent, and also has the advantage that the growl can be greatly reduced because the magnetic path can be configured without a gap.

However, since the core 102 has a toroidal shape, the winding efficiency of the coil is very poor. To secure a sufficient number of turns of the coil, it is necessary to increase the inner diameter of the toroidal core. This has the disadvantage that the magnetic path length increases, leading to an extra large size in shape. Further, there is a disadvantage that it is difficult to mount the board as a choke coil and to add an auxiliary winding.

Particularly, in the case of a core using an amorphous foil as a magnetic material, most of the core is in a toroidal shape due to the manufacturing method and restrictions of handling, so this problem is covered. Regarding magnetic properties, in order to cope with frequency characteristics of MHz, which is a high frequency, it is necessary to form a foil body amorphous having a thickness on the order of several μm, but there is a large problem in terms of manufacturing method and cost.

In order to solve the above-mentioned drawbacks, there is a dust core which can be powder-molded into an arbitrary shape like ferrite, and there is also an EE-type core 104 as shown in FIG.

The dust core 104 having the EE-type structure is powder-formed by lateral pressing, and the toroidal core 1
The performance as a coil component can be exhibited by making use of the advantage of an arbitrary shape as compared with 02, and the above-mentioned characteristics of the dust core can also be imparted.

However, with such a simple magnetic core shape, the total performance as a coil component cannot be further brought out. This is because dust cores generally require a pressure of 5 to 10 times or more as high as that of ferrite cores at the time of molding. This is because only arbitrary shapes can be made, and more complicated ones cannot be made so far.
Therefore, this dust core is simply formed by lateral pressing.

Further, even if a complicated dust core having an arbitrary shape can be forcibly formed, it must be formed at a point below a desired molding pressure, and the molding density is low and the magnetic characteristics of the dust core are low. Was not enough.

In addition, as a dust core, although a more uniform and higher density at the time of molding affects the magnetic properties at the time of completion of the core, the core shape to achieve this is not optimized. In addition, the molding density must be further reduced, and the magnetic properties of the dust core are not sufficient from this point.

[0019]

As described above,
Metal dust cores have a relatively high magnetic flux saturation density, have a relatively low magnetic loss, are compatible with MHz, and have thermal stability. 1 /
It has the advantage that it can be reduced in size and current to about 3 and that it can have high reliability, and furthermore has the advantage that the magnetic path can be configured without a gap, so that the growl can be greatly reduced. Regardless, since a powder magnetic core having an arbitrary complex shape formed by high-pressure molding cannot be formed, it is a reality that ferrite cores having an arbitrary shape by powder molding still occupy a large share.

That is, the above-mentioned conventional configuration has problems that the shape of the magnetic core cannot be complicated, and that the density of the magnetic core is low and uneven, so that the magnetic characteristics are low.

An object of the present invention is to solve the above-mentioned problems and to provide a coil component having a magnetic core having a complicated shape and excellent magnetic properties.

[0022]

To achieve the above object, the present invention has the following arrangement.

In the invention according to the first aspect of the present invention, in particular, the angle between the back leg and the outer leg formed by the adjacent surface adjacent to each other is 90 degrees or more, The cross-section angle formed by crossing the outer peripheral surface and the outer peripheral surface of the back leg portion is set to 90 degrees or more.

According to this configuration, the sharp edge structure is not formed on the outer peripheral surfaces of the back leg portion and the outer leg portion of the magnetic core, and the molding pressure resistance of the magnetic core forming die structure is improved. This makes it possible to obtain an arbitrarily complicated shape which has not been possible with a dust core in the past. Therefore, by using the dust core, the coil component can sufficiently bring out the performance.

Therefore, it is possible to obtain a dust core having an arbitrarily complicated shape which can be formed at a high pressure, which has not been possible in the past.
It can be achieved with high reliability. In addition, it is possible to provide a coil component which can cope with the frequency of MHz of the dust core and which is very stable with respect to temperature characteristics.

Further, in the power supply device using the coil component formed of the dust core, a power supply device having a small size such as a thin shape and a high reliability even under a large current can be obtained.

The second aspect of the present invention is the first aspect of the present invention.
In the described invention, in particular, the longitudinal dimension of the outer leg is shorter than the width of the back leg.

According to the above configuration, the same effect as that of the first aspect can be obtained.

The third aspect of the present invention provides the first aspect.
In the invention described above, the outer leg is connected to the back leg so that at least a part of the outer peripheral surface of the outer leg is located outside the outer peripheral surface of the back leg.

According to the above configuration, the same effect as that of the first aspect can be obtained.

The fourth aspect of the present invention is the first aspect of the present invention.
In the invention described, in particular, the outer leg is connected to the back leg so that the outer peripheral surface of one of the two outer legs is located inside the outer peripheral surface of the back leg. This is the configuration.

With the above configuration, the same effect as the first aspect of the invention can be obtained.

The fifth aspect of the present invention provides the first aspect.
In the described invention, in particular, the cross-sectional area of one of the two outer legs is 0.7 times or more and 1.4 times or less the cross-sectional area of the other outer leg.

According to the above-described structure, it is possible to stabilize the powder filling at the time of press molding in both parts, and to achieve a uniform and high-density core after molding. Generally, in powder molding, a granulated powder is filled in a mold by falling under its own weight, and the powder is formed by moving an upper punch and a lower punch (a die may be movable instead). By adjusting the cross-sectional area ratio of the filling as shown by, the powder filling becomes stable, and it becomes possible to achieve a uniform and high-density core after molding. Therefore, by using this dust core, the coil component can sufficiently bring out the performance.

The sixth aspect of the present invention provides the first aspect.
In the described invention, the middle leg is connected to the back leg so as to be located between the two outer legs, and the middle leg has an adjacent surface angle formed by adjacent surfaces adjacent to each other. The configuration is 90 degrees or more.

With the above configuration, the outer peripheral surface of the back leg, the outer leg, and the middle leg of the magnetic core having the middle leg does not have a sharp edge structure, and the molding pressure resistance of the magnetic core forming mold structure is improved. I do. This makes it possible to obtain an arbitrarily complicated shape which has not been possible with a dust core in the past. Therefore, by using the dust core, the coil component can sufficiently bring out the performance.

The invention according to claim 7 of the present invention is directed to claim 6
In the invention described above, the middle leg is connected to the back leg such that the outer peripheral surface of the middle leg is located inside the outer peripheral surface of the back leg.

With the above configuration, the same effect as that of the sixth aspect can be obtained.

The invention according to claim 8 of the present invention is directed to claim 6
In the described invention, the cross-sectional area of the middle leg is 0.7 times or more and 1.4 times or less the cross-sectional area of the outer leg.

With the above structure, the powder filling at the time of press molding in both parts can be stabilized, and a uniform and high-density core can be achieved after molding. Generally, in powder molding, a granulated powder is filled in a mold by falling under its own weight, and the powder is formed by moving an upper punch and a lower punch (a die may be movable instead). By adjusting the cross-sectional area ratio of the filling as shown by, the powder filling becomes stable, and it becomes possible to achieve a uniform and high-density core after molding. Therefore, by using the dust core, the coil component can sufficiently bring out the performance.

The ninth aspect of the present invention provides the first aspect.
Alternatively, in the invention according to the sixth aspect, particularly, the magnetic core is configured to be line-symmetric with respect to one direction.

According to the above-mentioned structure, by forming a symmetrical shape as shown in the present invention, the powder filling is stabilized, and it becomes possible to achieve a uniform and high-density core after molding. Therefore, by using the dust core, the coil component can sufficiently bring out the performance.

According to a tenth aspect of the present invention, in the sixth aspect of the invention, in particular, the width of the outer leg portion is such that the maximum width is less than twice the minimum width. is there.

According to the above-mentioned structure, the powder filling becomes stable, and it becomes possible to achieve a uniform and high-density core after molding. Therefore, by using the dust core, the coil component can sufficiently bring out the performance.

According to an eleventh aspect of the present invention, in the invention according to the sixth aspect, in particular, the end of the outer leg is formed in an arc shape, and the intermediate portion of the outer leg is provided with an inner surface facing each other. This is a configuration in which an arc-shaped concave portion is provided.

With the above configuration, the same effect as that of the sixth aspect can be obtained.

According to a twelfth aspect of the present invention, in the invention of the sixth aspect, one end of the two outer legs is connected to form one U-shaped outer leg. Configuration.

According to the above configuration, the same effect as that of the sixth aspect can be obtained.

According to a thirteenth aspect of the present invention, in the first or the sixth aspect of the present invention, an alloy-based dust core is used as the magnetic core.

According to a fourteenth aspect of the present invention, in the thirteenth aspect, in particular, the specific material is Fe-based,
The structure is a sendust-based, permalloy-based, FeSi-based, or amorphous-based.

According to a fifteenth aspect of the present invention, in the thirteenth aspect, the pressure is 5.88 × 10 ⁸ N /.
m ² (6 ton / cm ² ) or more.

(Embodiment 1) Hereinafter, a coil component according to a first embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 (a) and 1 (b) are a plan view and a front view of a vertically-pressed dust core constituting a coil component according to a first embodiment of the present invention, and FIGS. 2 (a) and 2 (b). 5)
(A), (b) is the top view and front view of the dust core of other forms of the same coil component.

The coil component according to the first embodiment of the present invention has a back leg 1 and two outer legs 2 connected to both ends of the back leg 1 in the vertical direction. It comprises a dust core having a mold shape, and a winding wound around the dust core.

1 to 5, in the structure viewed from the upper surface of the core, the outer peripheral surfaces of the back leg portion 1 and the outer leg portion 2 are formed so that the angle between adjacent surfaces formed by adjacent surfaces adjacent to each other is 90 degrees or more. (For example, the adjacent plane angle of (R) is 90 degrees). That is, there is no combination of adjacent outer peripheral surfaces that are constituted by straight lines or curved lines and have an adjacent surface angle of less than 90 degrees. The intersection 3 at which the outer peripheral surfaces of the back leg 1 and the outer leg 2 intersect each other is a straight line, and is orthogonal to each other. ing.

The core shape of these dust cores is
And the outer peripheral portion composed of the outer leg portion 2 has no sharp edge structure.

Generally, in such a vertically pressed powder molding of a core of a dust core, a press molding die is an independent die for molding a die, an upper punch, and a back leg 1 and an outer leg 2 respectively. The lower punch has a sharp edge on the inner surface of the die, the back leg 1 and the outer leg 2 by forming a core shape that eliminates the sharp edge structure on the outer peripheral surface as shown in the present invention. Structure, and the high pressure molding required for dust cores becomes possible.
Further, the molding life of the mold can be ensured.

Further, the dust core can have high magnetic properties as the packing increases during molding.

Therefore, the coil component using the core formed by the high pressure molding can be manufactured at low cost, with high reliability and with high magnetic characteristics.

As described above, in the first embodiment of the present invention,
High-density molding of dust cores of any complex shape, which could not be achieved in the past, is possible, and a dust core with a long mold life can be made, so that the magnetic properties of the core such as high permeability, low loss and low Achieved cost reduction, increased inductance of coil parts and suppression of heat generation by using the same. Advantages of improved characteristics such as lower DCR of coil parts due to arbitrary complex shapes, which were not possible in the past, and increased productivity. Can be provided.

Naturally, it goes without saying that the advantages of miniaturization, large current, low groaning, compatibility with MHz, and stability of temperature characteristics can be imparted without taking advantage of the high magnetic flux saturation density of the dust core.

At the same time as the basic effects as described above, the general outer leg 2 has a square U-shaped core shape as shown in FIG.
Also, the present invention can be applied to a U-shaped core having an elliptical outer leg portion 2 having an improved winding efficiency.

Further, the back leg 1 can be made thinner, and the coil component can be reduced in size by winding in only one direction of the outer leg 2 as shown in FIG. It can be applied to core shapes as shown in FIGS.

In particular, as shown in FIG. 3 and FIG.
When the cross-sectional areas are different from each other, by setting the cross-sectional area of one outer leg 2 to be 0.7 times or more and 1.4 times or less the cross-sectional area of the other outer leg, The features of the magnetic core can be brought out.

This is because powder magnetic cores are generally formed by powder molding, and the powder is charged into a mold by its own weight during press molding, and then molded. This is a self-weight filling method in which a filling method from a filling box having a movement in one direction has a high production efficiency and is the most adopted production method. At this time, the outer leg 2 is in the mold,
It is the part that needs to be filled with powder from the die surface to the deepest bottom. Therefore, by reducing the area ratio between the large area and the small area, the powder filling balance of the outer leg portion 2 which is the most difficult to fill is stabilized, and the filling property is improved. In this filling state, the pressure is uniformly dispersed throughout the mold at the time of molding, and a dust core having a well-balanced density of the molding core, high magnetic properties, high-pressure moldability, and a secure mold life can be obtained.

Accordingly, a high-performance coil component can be provided.

(Embodiment 2) Hereinafter, a coil component according to a second embodiment of the present invention will be described with reference to the drawings.

FIGS. 6A and 6B are a plan view and a front view of a dust core constituting a coil component according to a second embodiment of the present invention, and FIGS. 7A and 7B to FIG. 11 (a),
(B) is a plan view and a front view of a dust core in another form of the coil component, and FIGS. 12 to 17 are plan views of a magnetic core in another form of the coil component.

In the same figure, 4 is a back leg, 5 is an outer leg,
6 is the middle leg, 7 is the intersection of the back leg 4 and the outer leg 5, and d is the back leg 4 when the outer peripheral surface of the middle leg 6 is located inside the outer peripheral surface of the back leg 4. , The distance from the outer peripheral surface of the outer leg portion 5 to the outer peripheral surface of the middle leg portion 6, l ₁ is the maximum width dimension of the outer peripheral surface of the outer leg portion 5, and l ₂ is the minimum width dimension of the outer peripheral surface of the outer leg portion 5 Is shown.

The dust core constituting the coil component shown in FIGS. 6 to 15 has a back leg 4 and outer legs 5 at both ends of the back leg 4. The middle leg 6 was connected to the back leg 4 so as to be located between the outer legs 5,
Generally, it is an E-shaped core. 16 and 17
In the dust core constituting the coil component shown in FIG. 1, one end of each of the two outer legs 5 is connected to form one U-shaped outer leg 5.
A core having a pot-like shape. These are wound around the middle leg 6 to form a coil component.

Here, in the structure viewed from the upper surface of the core, the outer peripheral surface of the back leg portion 4, the outer leg portion 5, and the middle leg portion 6 has an adjacent surface angle formed by the adjacent surfaces adjacent to each other of 90 ° or more. Have been. That is, although the core is formed of a straight line or a curve, there is no outer peripheral surface having an acute angle of less than 90 degrees. The intersection 7 where the back leg 4 and the outer leg 5 intersect each other on the outer peripheral surface is orthogonal to each other if straight, and if the straight and curved, the tangent of the straight and curved is orthogonal. ing.

The core shape of these dust cores is
And the outer peripheral surface composed of the outer leg portion 5 has no sharp edge structure.

In general, in such a core-shaped vertically pressed powder molding, a press molding die is a die, an upper punch, and two independent lower punches for molding the back leg 4 and the outer leg 5 respectively. However, as shown in the present invention, by forming a core shape that eliminates the sharp edge structure of the outer peripheral surface, the inner punch of the die, the lower leg 4, and the lower punch 5 have a structure without sharp edges. Thus, the high pressure molding required for the dust core can be performed, and the molding life of the mold can be secured. In addition, the powder magnetic core can have high magnetic properties as the packing increases during molding.

Therefore, a coil component using this core can be manufactured at low cost, with high reliability, and with high magnetic characteristics.

Further, since the outer peripheral surface of the middle leg portion 6 is completely inside the outer peripheral surface of the back leg portion 4, the characteristics of the dust core can be brought out.

This is because the back leg 4
In terms of only the relationship between and the middle leg 6, the core middle leg 6 is formed inside the punch for forming the back leg 4.
At this time, if there is a certain mold piece outside the punch for forming the back leg 4, the pressure resistance of the punch for forming the back leg 4 can be secured, high pressure molding can be performed, and the molding life of the mold can be secured.

In addition to the effects described above, the cross-sectional area of one outer leg 5 is determined by the relationship between the cross-sectional area of the middle leg and the cross-sectional area of one outer leg 5. By setting the area to be 0.7 times or more and 1.4 times or less, the characteristics of the dust core can be further brought out.

In general, since a dust core is powder-formed, the powder is charged into a mold by its own weight at the time of press-forming, and then molded. At this time, the outer leg portion 5 and the middle leg portion 6 are portions that need to be filled with powder from the die surface to the deepest portion in the mold. Therefore, by making the area ratio of both smaller, the powder filling balance of the outer leg portion 5 and the middle leg portion 6 which are the most difficult to fill is stabilized, and the filling property is improved. In this filling state, the pressure is uniformly dispersed throughout the mold at the time of molding, and a dust core having a well-balanced density of the molding core, high magnetic properties, high-pressure moldability, and a secure mold life can be obtained.

8 to 17, the width of the outer leg portion 5 is set so that the maximum width l ₁ is less than twice the minimum width l ₂ , so that the feature of the dust core is obtained. Can be pulled out.

Since the powder magnetic core is formed by powder molding, the powder is charged into a mold by its own weight at the time of press molding, and then molded. Therefore, in the outer leg portion 5 which is generally designed to have an elongated shape, by reducing the difference in the width direction, the bias of the powder filling can be suppressed, the filling property can be improved even in an arbitrary shape, and the uniform filling state can be achieved as a whole. Is obtained. This uniform filling state
Pressure is evenly distributed throughout the mold during molding, and a magnetic core with good density balance of the molding core, high magnetic properties, high-pressure molding, and a long mold life can be obtained.

In FIG. 1 to FIG. 17, the characteristics of the dust core can be brought out by making the shape of the core linearly symmetric with respect to one direction.

This is because powder molding of a dust core is generally performed as follows.
The mold is filled with the powder by its own weight by a uniaxial movement, and then pressed. Therefore, if the core shape is line-symmetric with respect to at least one center line, if the filling direction of this one axis and this line symmetry direction are set in parallel, the filling property is improved over the whole, and the whole is improved. A uniform filling state is obtained. In this uniform filling state, the pressure is uniformly dispersed throughout the mold at the time of molding, and a powder magnetic core is obtained in which the density balance of the molding core is good, high magnetic characteristics are possible, high-pressure molding is possible, and the life of the mold is ensured.

As described above, in the second embodiment of the present invention,
High-density molding of dust cores of any complex shape, which could not be achieved in the past, is possible, and a dust core with a long mold life can be made, so that the magnetic properties of the core itself, such as high permeability and low loss, Achieved low cost, high inductance of coil parts using it and suppression of heat generation, giving advantages such as lower DCR of coil parts due to arbitrary shape than conventional and improvement of productivity. It is possible to do.

Naturally, it goes without saying that the advantages of miniaturization, large current, low groaning, compatibility with MHz, and stability of temperature characteristics can be imparted without taking advantage of the high magnetic flux saturation density of the dust core.

Further, as shown in FIG. 8 to FIG.
The middle part is a core shape with an arc-shaped concave part on the inner side facing each other, which can effectively store windings in this part, and a core shape that can exhibit the characteristics of small and thin coil parts Is also applicable. As shown in FIGS. 16 and 17, the present invention can also be applied to a pot core that can fully utilize the effective space of the core and can maximize the inductance as a coil component.

(Embodiment 3) Hereinafter, a coil component according to a third embodiment of the present invention will be described.

By using an alloy-based powder as the powder magnetic core described in the first and second embodiments, the effectiveness of lower loss and higher magnetic saturation characteristics can be imparted.
The above effects can be further improved. As a specific material,
Fe-based, FeAl-based, Fe
By using Si system, FeAlSi system, FeNi system, amorphous system, nano-microcrystalline amorphous system, etc.,
The effect is absolute.

Also, if the molding pressure in the press molding of the powder is higher than 5.88 × 10 ⁸ N / m ² (6 ton / cm ² ), the magnetic properties of the core can be sufficiently brought out. The effect can be improved by this. That is, a coil component using this core can have high performance of magnetic characteristics.

More specifically, in a power supply device using a coil component formed of a dust core, there is an effect that a power supply device of a small size such as thinning, a high quality, and a low cost can be obtained.

In terms of the effects that are effective for each set of power supply devices, there is an effect that the mounting area can be reduced in a television receiver or a CRT display device.

In the lighting field and office equipment power supplies, there are many restrictions in the height direction, and there is an effect that the height can be reduced as the coil parts are made thinner.

Power supplies in the field of personal computers are also required to be thin and large in current, and it is effective to make coil components compatible with large currents and thin.

There is also a demand for a power supply device in the field of automobiles to be small in size, light in weight, and large in current, but it is very effective to make the coil component compatible with large current and small in size.

[0094]

As described above, according to the present invention, the back leg and the outer leg have an adjacent surface angle of 90 degrees or more formed by the adjacent surfaces adjacent to each other. Since the angle of the crossing plane formed by intersecting the surface and the outer peripheral surface of the back leg portion is 90 degrees or more, the sharp edge structure is eliminated on the outer peripheral surface of the back leg portion and the outer leg portion of the magnetic core. It is possible to provide a coil component having a complex-shaped magnetic core with improved molding pressure resistance of a molding die structure and excellent magnetic properties.

[Brief description of the drawings]

FIG. 1A is a plan view of a dust core of a coil component according to a first embodiment of the present invention. FIG. 1B is a front view of a dust core of the coil component.

FIG. 2A is a plan view of a dust core of another embodiment of the coil component. FIG. 2B is a front view of a dust core of another embodiment of the coil component.

FIG. 3A is a plan view of a dust core according to another embodiment of the coil component. FIG. 3B is a front view of a dust core according to another embodiment of the coil component.

FIG. 4 (a) is a plan view of a dust core of another embodiment of the same coil part. (B) is a front view of a dust core of another embodiment of the same coil part.

FIG. 5A is a plan view of a dust core in another embodiment of the coil component. FIG. 5B is a front view of a dust core in another embodiment of the coil component.

6A is a plan view of a dust core of a coil component according to a second embodiment of the present invention. FIG. 6B is a front view of a dust core of the coil component.

FIG. 7A is a plan view of a dust core according to another embodiment of the coil component. FIG. 7B is a front view of a dust core according to another embodiment of the coil component.

FIG. 8A is a plan view of a dust core according to another embodiment of the coil component. FIG. 8B is a front view of a dust core according to another embodiment of the coil component.

9A is a plan view of a dust core according to another embodiment of the coil component. FIG. 9B is a front view of a dust core according to another embodiment of the coil component.

FIG. 10A is a plan view of a dust core according to another embodiment of the coil component. FIG. 10B is a front view of a dust core according to another embodiment of the coil component.

FIG. 11A is a plan view of a dust core according to another embodiment of the coil component. FIG. 11B is a front view of a dust core according to another embodiment of the coil component.

FIG. 12 is a plan view of a dust core according to another embodiment of the coil component.

FIG. 13 is a plan view of a dust core according to another embodiment of the coil component.

FIG. 14 is a plan view of a dust core according to another embodiment of the coil component.

FIG. 15 is a plan view of a dust core according to another embodiment of the coil component.

FIG. 16 is a plan view of a dust core according to another embodiment of the coil component.

FIG. 17 is a plan view of a dust core according to another embodiment of the coil component.

FIG. 18 is a perspective view of a choke coil which is a conventional coil component.

FIG. 19 is a perspective view of another form of the choke coil which is the same coil component.

FIG. 20 is a perspective view of another form of the choke coil which is the same coil component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Back leg part 2 Outer leg part 3 Intersection 4 Back leg part 5 Outer leg part 6 Middle leg part 7 Intersection 100 EE type core with a gap in a middle magnetic leg 101 Coil 102 Toroidal type core 103 Coil 104 EE type core with no gap 105 Magnetic gap

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H01F 31/00 A

Claims (15)

[Claims] 1. A magnetic core comprising a back leg, two outer legs connected vertically to both ends of the back leg, and a winding wound around the core. The angle between the outer surface of the outer leg and the outer surface of the rear leg intersects with each other, while the back leg and the outer leg have an adjacent surface angle of 90 degrees or more formed by adjacent surfaces adjacent to each other. A coil component having an angle of intersection of 90 degrees or more. 2. The coil component according to claim 1, wherein the length of the outer leg is shorter than the width of the back leg. 3. The coil component according to claim 1, wherein the outer leg is connected to the back leg such that at least a part of the outer surface of the outer leg is located outside the outer surface of the back leg. . 4. The outer leg portion is connected to the back leg portion so that the outer peripheral surface of one of the two outer leg portions is located inside the outer peripheral surface of the back leg portion. Item 2. The coil component according to Item 1. 5. The cross-sectional area of one of the two outer legs is not less than 0.7 times and not more than 1.4 times the cross-sectional area of the other outer leg. The described coil component. 6. A middle leg is connected to the back leg so as to be located between the two outer legs, and the middle leg has a 90 ° angle between adjacent surfaces formed by adjacent surfaces adjacent to each other. The coil component according to claim 1, wherein 7. The coil component according to claim 6, wherein the middle leg is connected to the back leg such that the outer peripheral surface of the middle leg is located inside the outer peripheral surface of the back leg. 8. The cross-sectional area of the middle leg is equal to the cross-sectional area of the outer leg.
7. The coil component according to claim 6, wherein the coil component is at least 7 times and at most 1.4 times. 9. The coil component according to claim 1, wherein the shape of the magnetic core is a shape symmetrical with respect to one direction. 10. The coil component according to claim 6, wherein the width of the outer leg portion is such that the maximum width is less than twice the minimum width. 11. The coil component according to claim 6, wherein an end of the outer leg portion is formed in an arc shape, and an intermediate portion of the outer leg portion is provided with an arc-shaped concave portion on inner surfaces facing each other. 12. The coil component according to claim 6, wherein one ends of the two outer legs are connected to form one U-shaped outer leg. 13. The coil component according to claim 1, wherein an alloy-based powder magnetic core is used as the magnetic core. 14. The specific material is Fe-based, Sendust-based,
14. The coil component according to claim 13, wherein the coil component is a permalloy-based, FeSi-based, or amorphous-based. 15. The pressure is 5.88 × 10 ⁸ N / m ² (6 to
The coil component according to claim 13, wherein the ratio is at least n / cm ² ).