JP2000124034A - Inductors and electronics - Google Patents

Abstract

(57) [Problem] To provide an inductor having a small leakage flux and a large inductance value even in a small shape, an electronic device equipped with the inductor, and an inductor having a small leakage flux and a small shape. Provided is an electronic device equipped with an inductor so that a large inductance value can be obtained. Kind Code: A1 An inductor element having a magnetic core and a winding is disposed in parallel with each other. The winding directions of the windings 12 and 22 are as follows.
The direction is opposite when the coils 22 and 22 are connected in parallel, and the same when the coils 12 and 22 are connected in series. Since the inductor elements 10 and 20 are magnetically coupled to each other to form a closed magnetic circuit, the leakage flux is reduced, and
A large inductance value can be obtained with a small number of turns, and the shape can be reduced accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor and an electronic device, and more particularly to a chip inductor used for a notebook personal computer, a handheld personal computer, a power supply, and the like, and various electronic devices on which the inductor is mounted.

[0002]

2. Description of the Related Art A conventional inductor has a structure in which a winding is provided around a single magnetic core.

[0003]

Since this kind of conventional inductor has an open magnetic circuit, the characteristics of adjacent electronic components are degraded due to leakage magnetic flux, and eddy current loss occurs in adjacent conductors. And so on.

Further, in order to increase the inductance value, it is necessary to increase the number of turns, and there is a problem that the shape is correspondingly increased.

Accordingly, an object of the present invention is to provide an inductor having a small leakage magnetic flux.

Another object of the present invention is to provide an inductor which can obtain a large inductance value even in a small shape.

It is still another object of the present invention to provide an electronic device equipped with an inductor having a small leakage magnetic flux.

It is still another object of the present invention to provide an electronic device equipped with an inductor capable of obtaining a large inductance value even in a small shape.

It is still another object of the present invention to provide an electronic device mounted with an inductor so that the leakage flux is small.

It is still another object of the present invention to provide an electronic device equipped with an inductor so that a large inductance value can be obtained even when an inductor having a small shape is used.

[0011]

According to a first aspect of the present invention, there is provided an inductor comprising a plurality of inductor elements each having a magnetic core and a winding provided around the magnetic core. The windings of the plurality of inductors are connected to each other in accordance with the winding direction of each of the windings of each of the plurality of inductor elements so that the elements are magnetically coupled to each other to form a closed magnetic circuit. An inductor is provided, wherein the inductor is disposed.

According to the second aspect, the plurality of inductor elements are disposed substantially in parallel with each other, and the winding directions of the windings of adjacent ones of the plurality of inductor elements are opposite to each other. 2. The inductor according to claim 1, wherein the windings of the inductor element are connected in parallel.

According to the third aspect, the plurality of inductor elements are disposed substantially in parallel with each other, and the winding directions of the windings of adjacent ones of the plurality of inductor elements are set to be the same. The inductor according to claim 1, wherein the windings of the inductor element are connected in series.

According to a fourth aspect of the present invention, both ends of the magnetic core of each of the plurality of inductor elements and the windings located between them or the vicinity thereof are fixed, respectively. 4. The inductor according to claim 1, wherein the plurality of inductor elements are positioned and fixed.

According to the fifth aspect, conductive terminals are fixed to the both ends of the magnetic core of each of the plurality of inductor elements or in the vicinity thereof, and the windings of each of the plurality of inductor elements are fixed. Both ends of the magnetic body are electrically connected to the terminals fixed to the ends of the magnetic body or the vicinity thereof, respectively, and are fixed to the ends of the magnetic body of each of the plurality of inductor elements or the vicinity thereof. 5. The inductor according to claim 4, wherein said plurality of inductor elements are positioned and fixed using said terminals.

According to claim 6, the inductor further comprises first and second terminals which are conductive, the plurality of inductor elements are disposed substantially in parallel with each other, and One end of the two ends of the magnetic core or the vicinity thereof is commonly fixed to the first terminal, respectively, and the other one of the two ends of the magnetic core of each of the plurality of inductor elements is provided. By fixing the ends or the vicinity thereof to the conductive second terminals in common, the plurality of inductor elements are positioned and fixed,
5. The inductor according to claim 4, wherein both ends of the winding of each of the plurality of inductor elements are electrically connected to the first and second terminals, respectively.

According to the present invention, the terminals or the first and second terminals and the both ends of the magnetic core of each of the plurality of inductor elements or the vicinity thereof are covered with a resin mold. 6. The method according to claim 5, wherein
Or, the inductor according to 6 is provided.

According to claim 8, the inductor further includes a substrate and a plurality of lands formed on the substrate, and the two ends of the magnetic core of each of the plurality of inductor elements or the two ends thereof. 6. The inductor according to claim 5, wherein the plurality of inductor elements are positioned and fixed on the substrate by fixing the terminals respectively fixed in the vicinity to the plurality of lands.

According to the ninth aspect, the inductor further includes a substrate and first and second lands formed on the substrate, wherein the plurality of inductor elements are disposed substantially parallel to each other, The terminals respectively fixed to one end or the vicinity of one end of both ends of the magnetic core of each of the plurality of inductor elements are commonly fixed to the first land, respectively, and the plurality of inductor elements are By fixing the terminals respectively fixed to the other end of the both ends of each of the magnetic cores or in the vicinity thereof to the second land in common, the plurality of inductor elements are connected to the second land. The inductor according to claim 5, wherein the inductor is positioned and fixed on a substrate.

According to the tenth aspect, the magnetic core of each of the plurality of inductor elements is a flat magnetic core, and the conductive terminal or the first and second conductive elements are provided.
10. The inductor according to claim 5, wherein the terminal is fixed to one main surface of the plate-shaped magnetic core.

According to the eleventh aspect, the terminal or the first and second terminals are flat terminals, and are fixed to the one main surface of the flat magnetic core. An inductor according to claim 10 is provided.

According to the twelfth aspect, the plurality of inductor elements are disposed substantially parallel to each other, and the interval between the windings of adjacent ones of the plurality of inductor elements is set to 5 m.
The inductor according to any one of claims 1 to 11, wherein m is equal to or less than m.

According to a thirteenth aspect, there is provided an electronic apparatus comprising the inductor according to any one of the first to twelfth aspects.

According to the present invention, there is provided an electronic apparatus including a plurality of inductors each having a magnetic core and a winding provided around the magnetic core, wherein the plurality of inductors are magnetically coupled to each other. As constituting a closed magnetic circuit,
An electronic device is provided, wherein the windings of the plurality of inductors are connected to each other in accordance with the winding directions of the windings of the plurality of inductors, and the plurality of inductors are disposed. You.

According to the fifteenth aspect, the plurality of inductors are disposed substantially in parallel with each other, and the winding directions of the windings of adjacent ones of the plurality of inductors are opposite to each other. The electronic device according to claim 14, wherein the windings of the inductor are connected in parallel.

According to a sixteenth aspect, the plurality of inductors are disposed substantially in parallel with each other, and the winding directions of the windings of adjacent ones of the plurality of inductors are set to be the same direction. The electronic device according to claim 14, wherein the windings of the inductor are connected in series.

According to claim 17, both ends of the magnetic core of each of the plurality of inductors and the two ends where the winding is located therebetween or the vicinity thereof are fixed, respectively. 17. The electronic device according to claim 14, wherein the plurality of inductors are positioned and fixed.

According to the eighteenth aspect of the present invention, conductive terminals are fixed to the two ends of the magnetic core of each of the plurality of inductors or in the vicinity thereof, and both ends of the winding of each of the plurality of inductors are fixed. Parts are respectively electrically connected to the terminals fixed to the both ends of the magnetic body or the vicinity thereof, and the terminals respectively fixed to the both ends of the magnetic body of the plurality of inductors or the vicinity thereof. 18. The electronic device according to claim 17, wherein the plurality of inductors are positioned and fixed by utilizing the following.

According to claim 19, the magnetic core of each of the plurality of inductors is a flat magnetic core, and the conductive terminal or the first and second terminals are connected to the flat plate. 19. The electronic device according to claim 18, wherein the electronic device is fixed to one main surface of the magnetic core.

According to a twentieth aspect, the terminal or the first and second terminals are flat terminals, and are fixed to the one main surface of the flat magnetic core. An electronic device according to claim 19 is provided.

According to a twenty-first aspect, the plurality of inductors are arranged substantially in parallel with each other, and the interval between the windings of adjacent ones of the plurality of inductors is set to 5 mm or less. An electronic device according to any one of claims 14 to 20 is provided.

[0032]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 9 is a view for explaining an inductor suitably used in the present invention. FIG. 9A is a plan view and FIG. 9B is a front view.

A winding 112 is provided around the center of a flat magnetic core 111, and the lower surfaces of both ends of the magnetic core 111 are mounted on conductive terminals 113 and 114, respectively. 113 and 114.

The flat magnetic core 111 is preferably made of a Ni—Zn ferrite material and has a low loss design. The Curie temperature is 200 ° C. or more, and the resistivity is 10 ⁵ Ωm or more. is there. The size of the magnetic core 111 is, for example, 10 mm in the longitudinal direction and 3.0 m in the width direction.
Those having m and a height, that is, a thickness of 0.5 mm are preferably used.

The winding 112 is made of a flat magnetic core 111.
Are wound three times in close contact with each other, for example, within a range of 5.0 mm in the center of the magnetic core 111. In the state after the winding 112 is wound around the magnetic core 111, the widthwise size is, for example, 3. 8m
m, the thickness is, for example, 1.3 mm.

The terminals 113 and 114 are each formed in a thin plate shape from a copper alloy such as beryllium copper or phosphor bronze, and are adhered to the lower surfaces of both ends of the magnetic core 111 as shown in FIG. 9B. It is preferable that this bonding be performed by an elastic and heat-resistant conductive adhesive. In addition,
Leads (not shown) from the winding 112 were connected to the terminals 113 and 114 by high-temperature solder.

By configuring the terminals 113 and 114 as described above, the loss due to the eddy current can be reduced, for the following reason.

Instead of the terminals 113 and 114, it is conceivable to provide a ring-shaped terminal around the conductor at the end of the magnetic core 111. In this case, however, the coil is formed by the ring-shaped terminal. Becomes short (one turn short). As a result, the magnetic energy in the magnetic core 111 is consumed, and the inductance is reduced. Then, in order to prevent one-turn short-circuit, the ring structure of the ring-shaped terminal may be divided vertically and formed into two U-shapes.
Also in this case, the fluctuation of the magnetic flux penetrating the end face of the magnetic core causes an eddy current in the conductor forming the terminal, and the energy is consumed, so that the inductance fluctuates.

On the other hand, when the terminals 113 and 114 are configured as described above, a short-circuit does not occur for one turn, and a terminal structure is provided in which the magnetic flux does not easily fluctuate at the end face of the magnetic core 111. In addition, it is possible to reduce the loss due to the eddy current, thereby preventing a decrease in inductance.

Since the inductor having such a structure has the above excellent characteristics, in the embodiment of the present invention, an inductor having the above structure or a structure similar to the above structure is used. When used alone,
As shown in FIG. 9A, the open magnetic path has adverse effects such as deteriorating the characteristics of the nearby electronic components due to leakage magnetic flux and causing eddy current loss in the nearby conductor. In addition, in order to increase the inductance value, it is necessary to increase the number of turns, and accordingly, the shape becomes large.

Therefore, in the present embodiment, an inductor is formed or arranged as described below.

(First Embodiment) FIG. 1 is a view for explaining a first embodiment of the present invention. FIG. 1A is a schematic plan view, and FIGS. 1B and 1C are equivalent circuit diagrams. is there.

The inductor according to the present embodiment has two inductor elements 10 and 20, and these two inductor elements 10 and 20 are arranged in parallel with each other. The inductor element 10 includes a magnetic core 11 and a magnetic core 11.
And a winding 12 provided around the periphery. The inductor element 20 includes a magnetic core 21 and a winding 12 provided around the magnetic core 21.

A winding 12 is provided around the center of a flat magnetic core 11, and flat terminals 15 and 16 are fixed to the lower surfaces of both ends 13 and 14 of the magnetic core 11, respectively.
2 are connected to terminals 15 and 16, respectively. A winding 22 is provided around the center of a flat magnetic core 21,
The lower surfaces of both ends 23 and 24 of the magnetic core 21 are fixed on flat terminals 25 and 26, respectively, and both ends of the winding 22 are connected to the terminals 25 and 26, respectively.

Inductor element 10 and inductor element 20
Have the same structure as each other. However, the winding directions of the windings 12 and 22 are opposite when the windings 12 and 22 are connected in parallel as shown in FIG. 1B, and the winding directions are as shown in FIG. 1C as shown in FIG. 1C. If the lines 12, 22 are connected in series, they are in the same direction.

By setting the winding directions and the connection states of the windings 12 and 22 in this manner, the inductor element 10 and the inductor element 20 are magnetically coupled to each other to form a closed magnetic circuit.
Accordingly, the leakage magnetic flux is reduced, and it is possible to suppress or prevent adverse effects such as deteriorating the characteristics of the nearby electronic components and causing eddy current loss in the nearby conductor.

Furthermore, since the inductor element 10 and the inductor element 20 are magnetically coupled to each other to form a closed magnetic circuit, a large inductance value can be obtained with a small number of turns.
The shape can be reduced accordingly. In particular, in the inductor of the present embodiment, the flat magnetic core 1
1, 21 can be used to reduce the height of the inductor. However, if the number of turns can be reduced as described above, the height of the inductor can be further reduced as compared with the case where a single inductor is used. It becomes a suitable structure.

Further, both ends 13, 14 of the magnetic core 11 are provided.
Terminals 15 and 16 are fixed to the lower surface of the magnetic core 21, respectively, and the terminals 25 and
6 are fixed, so that these terminals 15, 16, 2
The positioning of the inductor elements 10 and 20 can be easily and accurately performed by the elements 5 and 26. In particular, these terminals 15, 1
6, 25, 26, both ends 13 of the magnetic core 11;
14 and both ends 23 and 24 of the magnetic core 21 can be positioned and fixed, so that the distance and inclination or parallelism between the inductor element 10 and the inductor element 20 can be easily and accurately set, and the inductor The magnetic coupling between the element 10 and the inductor element 20 can be accurately controlled.

(Second Embodiment) FIG. 2 is a view for explaining a second embodiment of the present invention. FIG. 2A is a schematic plan view, and FIG. 2B is an equivalent circuit diagram thereof.

The inductor elements 10 and 20 of the present embodiment
Are the inductor elements 10 and 20 of the first embodiment.
However, the two inductor elements 10 and 20 are connected in parallel, and the winding directions of the windings 12 and 22 are reversed. The terminals 16 and 26 are both connected to the wiring pattern 31, and the terminals 15 and 25 are both connected to the wiring pattern 32.

(Third Embodiment) FIG. 3 is a view for explaining a third embodiment of the present invention. FIG. 3A is a schematic plan view, and FIG. 3B is an equivalent circuit diagram thereof.

The inductor elements 10 and 20 of the present embodiment
Are the inductor elements 10 and 20 of the first embodiment.
However, the two inductor elements 10 and 20 are connected in series, and the winding directions of the windings 12 and 22 are the same. Wiring pattern 33 to terminal 16
, The wiring pattern 35 is connected to the terminal 26, and the terminals 15 and 25 are both connected to the wiring pattern 34.

(Fourth Embodiment) FIG. 4 is a schematic sectional view for explaining a fourth embodiment of the present invention.

The inductor elements 10 and 20 of the present embodiment
Are the inductor elements 10 and 20 of the first embodiment.
Is the same as In the present embodiment, two lands 18 and 28 are formed on a printed board (mounting board) 30 respectively, and one land 18 and one land 2 are formed.
8 and the terminal 1 fixed to the inductor elements 10 and 20
The terminals 6 and 26 were fixed by solder, respectively, and the terminals 15 and 25 fixed to the inductor elements 10 and 20 on the other land 18 and the other land 28 were similarly fixed by solder.

In this manner, the inductor element 1 is determined by the distance between the lands 18 and 28 or by the distance between the lands 18 and 28 and the width of the terminals 15, 25, 16 and 26.
The degree of coupling of 0 and 20 can be determined.

(Fifth Embodiment) FIG. 5 is a view for explaining a fifth embodiment of the present invention. FIG. 5A is a plan view, and FIG. 5B is a side view of FIG. 5A viewed from the right side. FIG. 5C is a side view of FIG. 5A as viewed from below.

The inductor according to the present embodiment includes two inductor elements 10 and 20 and flat terminal plates 61 and 62. These two inductor elements 10, 20 are arranged parallel to one another. The inductor element 10 includes a flat magnetic core 11 and a winding 12 provided around the magnetic core 11. The inductor element 20 includes a flat magnetic core 21 and a winding 12 provided around the magnetic core 21.

The lower surface of one end 13 of the magnetic core 11 and the lower surface of one end 23 of the magnetic core 21 are both fixed to the terminal plate 61 with an adhesive, and the other end of the magnetic core 11 is fixed. 1
4 and the lower surface of the other end 24 of the magnetic core 21 were both fixed to the terminal plate 62 with an adhesive.

The end 13 of the magnetic core 11 and the magnetic core 2
The end 23 and the terminal plate 61 were covered with a resin mold 63, and the end 14 of the magnetic core 11, the end 24 of the magnetic core 21, and the terminal plate 62 were covered with a resin mold 64. Note that both end portions of the terminal plate 61 are exposed from the resin mold 63, and both end portions of the terminal plate 62 are exposed from the resin mold 64. The connection ends 43 and 53 are provided to protrude from the terminal plate 61, and the connection ends 43 and 53 are exposed from the resin mold 63. The terminal plate 62 has connection ends 44 and 54 protruding therefrom, and the connection ends 44 and 54 are exposed from the resin mold 64.

The winding 12 is provided around the center of the flat magnetic core 11, one winding end 41 of the winding 12 is connected to the connection end 43, and the other winding end of the winding 12 is connected. 42 is connected to a connection end 44. A winding 22 is provided around the center of a flat magnetic core 21, and one winding end 51 of the winding 22 is provided.
To the connection end 53, and the other winding end 52 of the winding 22
Is connected to the connection end 54.

In the present embodiment, the windings 12, 22
Are connected in parallel, and the winding directions of the windings 12 and 22 are opposite to each other.

As described above, if the ends 13 and 23 are fixed to the terminal plate 61 while maintaining a constant interval, and the ends 14 and 24 are fixed to the terminal plate 62 while maintaining a constant interval, the inductor The degree of coupling of the elements 10, 20 can be determined to a predetermined one. Further, since these fixed portions are covered with the resin mold, the inductor elements 10 and 20 and the terminal plates 61 and 62 are more firmly fixed.

In this embodiment, the terminal plate 6
Copper alloys such as beryllium copper and phosphor bronze were used as 1 and 62.

Further, by making the terminal plates 61 and 62 plate-shaped and fixing them to only the lower surfaces of the magnetic cores 11 and 21, one-turn short-circuit does not occur, and
Since the terminal structure of the magnetic cores 11 and 21 has a terminal structure in which a magnetic flux does not easily fluctuate, loss due to eddy current can be reduced, thereby preventing a decrease in inductance.

(Sixth Embodiment) FIG. 6 is a schematic plan view for explaining a sixth embodiment of the present invention.

The inductor elements 10, 20 according to the present embodiment
Are the inductor elements 10 and 20 of the first embodiment.
Is the same as In the present embodiment, lands 71 and 72 are respectively formed on a printed circuit board (mounting board) (not shown), and end portions 13 of inductor element 10 are formed.
Terminal 15 and inductor element 20 fixed to the lower surface of
The terminal 25 fixed to the lower surface of the end 23 of the
The terminals 16 are fixed together on the lands 71 by solder so as to keep the distance between the terminals 25 constant, and the terminals 16 fixed to the lower surface of the end 14 of the inductor element 10 and the lower surface of the end 24 of the inductor element 20. Terminal 26 is connected to terminals 16, 2
6 were fixed together on the lands 72 by soldering so that the interval between the terminals 6 was the same as the interval between the terminals 15 and 25. In this way, if the ends 13 and 23 are fixed to the land 71 while maintaining a constant interval, and the ends 14 and 24 are fixed to the land 72 while maintaining a constant interval, the coupling of the inductor elements 10 and 20 can be achieved. The degree can be determined to a predetermined one.

In each of the above embodiments, an inductor having two inductor elements has been described as an example. However, the present invention can also be applied to an inductor having three or more inductor elements. It is preferable to form a closed magnetic path between adjacent inductor elements by taking the same configuration as between the two inductor elements in each of the above embodiments.

Further, in each of the above embodiments, an inductor component such as a chip inductor having an inductor element has been described as an example. However, the present invention has a structure in which individual inductors are arranged as in the above embodiments. In this case, the configuration is such that the inductor element in each of the above embodiments is replaced with an individual inductor.

[0070]

EXAMPLES (First Example) The data of this example was obtained by using the inductor having the configuration of the first embodiment. The relationship between the distance D between the windings 12 and 22 of the inductor elements 10 and 20 and the inductance value was examined. FIG. 7 shows the result.

As the distance D decreases, the inductance value L increases. It can be seen that the inductor elements 10 and 20 are magnetically coupled to form a closed magnetic path. And
A larger inductance value can be obtained with a smaller number of turns.

When the distance D becomes 5 mm or less, the L value rises sharply, and when it becomes 1 mm or less, it becomes close to a closed magnetic field. Therefore, the interval D is preferably 5 mm or less, particularly preferably 1 mm or less.

The specific contents of the inductor used in this embodiment are as follows.

The flat magnetic cores 11 and 12 are made of Ni-
Made of Zn-based ferrite material, Curie temperature is 200
° C or higher, and the resistivity was 10 ⁵ Ωm. The magnetic cores 11 and 12 had the same size as each other, and each had a longitudinal direction of 10 mm, a width direction of 3.0 mm, and a height, that is, a thickness of 0.5 mm. The windings 12, 22 are wound three times in close contact with each other in a range of, for example, 5.0 mm at the center of each of the plate-shaped magnetic cores 11, 12. In the state after winding the winding 12 and the state after winding the winding 22 around the magnetic core 21, the size in the width direction was 3.8 mm and the thickness was 1.3 mm.

The terminals 15, 16, 25, and 26 are each formed in a thin plate shape from a copper alloy such as beryllium copper, phosphor bronze, or the like. 23 and 24 were bonded to the lower surfaces.

(Second Example) The data of this example is based on the data of the inductor according to the first embodiment. After driving the DC-DC converter, a metal plate is attached to the inductor. By approaching, the consumed current was measured to examine the effect of the leakage magnetic flux. The result is shown by (□) in FIG.
The measurement was performed by mounting the inductor on the substrate and disposing a metal plate parallel to the mounting surface of the substrate at a distance D in the vertical direction from the mounting surface of the substrate on which the inductor was mounted.

FIG. 8 is a graph showing the relationship between the distance D between the metal plate and the inductor and the input current. For comparison, the winding direction of the winding of one of the two inductor elements constituting the inductor is opposite to that of the present embodiment to weaken the coupling of the magnetic flux, and the other configurations are the same as those of the present embodiment. The measurement was performed using the same inductor as that of the example under the same conditions as those of the present example. The result is shown by (△) in FIG.

According to FIG. 8, the fluctuation of the input current due to the distance between the inductor and the metal plate is smaller when the magnetic coupling between the inductor elements is strengthened. It can be understood that the magnetic field is hardly affected by the magnetic field.

The specific contents of the inductor used in this embodiment are as follows.

The flat magnetic cores 11 and 12 are made of Ni-
Made of Zn-based ferrite material, Curie temperature is 200
° C and the resistivity was 10 ⁵ Ωm. Magnetic core 1
1 and 12 had the same size as each other, each having a longitudinal direction of 10 mm, a width direction of 3.0 mm, and a height, that is, a thickness of 0.5 mm. The windings 12 and 22 are, for example, 0.4 mm at the center of each of the plate-shaped magnetic
In the state after the winding 12 is wound around the magnetic core 11 and the state after the winding 22 is wound around the magnetic core 21, ,
The size in the width direction was 3.8 mm, and the thickness was 1.3 mm, respectively.

The terminals 15, 16, 25, and 26 are each formed in a thin plate shape from a copper alloy such as beryllium copper, phosphor bronze, or the like. 23 and 24 were bonded to the lower surfaces.

Further, as a metal plate approaching the inductor, a metal such as copper or aluminum was used, and its size was about 10 mm × 30 mm × 1 mm.

[0083]

According to the present invention, an inductor having a small leakage flux is provided.

Further, according to the present invention, there is provided an electronic device mounted with an inductor having a small leakage magnetic flux.

Further, according to the present invention, there is provided an electronic device mounted with an inductor so that leakage magnetic flux is small.

Therefore, it is possible to suppress adverse effects such as deteriorating the characteristics of adjacent electronic components due to leakage magnetic flux and causing eddy current loss in the adjacent conductor.

Further, according to the present invention, there is provided an inductor capable of obtaining a large inductance value even in a small shape.

Further, according to the present invention, there is provided an electronic device equipped with an inductor capable of obtaining a large inductance value even in a small shape.

Further, according to the present invention, there is provided an electronic device having an inductor mounted thereon so that a large inductance value can be obtained even when an inductor having a small shape is used.

Therefore, an electronic device equipped with an inductor can be made smaller and have higher performance.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a first embodiment of the present invention. FIG. 1A is a schematic plan view, and FIGS. 1B and 1C are equivalent circuit diagrams.

FIGS. 2A and 2B are views for explaining a second embodiment of the present invention, FIG. 2A is a schematic plan view, and FIG. 2B is an equivalent circuit diagram thereof.

FIGS. 3A and 3B are diagrams for explaining a third embodiment of the present invention. FIG. 3A is a schematic plan view, and FIG. 3B is an equivalent circuit diagram thereof.

FIG. 4 is a schematic cross-sectional view for explaining a fourth embodiment of the present invention.

5A and 5B are diagrams for explaining a fifth embodiment of the present invention. FIG. 5A is a plan view, FIG. 5B is a side view of FIG. 5A viewed from the right side, and FIG. 5C is FIG. It is the side view seen from.

FIG. 6 is a schematic plan view for explaining a sixth embodiment of the present invention.

FIG. 7 is a graph showing a relationship between a core interval and an inductance value.

FIG. 8 is a graph showing a relationship between a distance between a metal plate and a coil and an input current.

9A and 9B are views for explaining an inductor suitably used in the present invention, wherein FIG. 9A is a plan view and FIG. 9B is a front view.

[Explanation of symbols]

 10, 20 ... inductor element 11, 21, 111 ... magnetic core 12, 22, 112 ... winding 13, 14, 23, 24 ... end 15, 16, 25, 26, 27, 113, 114 ... terminal 18, 28, 71, 72 land 30 printed circuit board 31-35 wiring pattern 41, 42, 51, 52 winding end 43, 44, 53, 54 connection end 61, 62 terminal plate 63, 64 resin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Doi 1-2-18 Ikenohata, Taito-ku, Tokyo Sumitomo Metal Industries, Ltd. Electronic Components Division (72) Inventor Toru Umeno 2 Egawa, Shimamotocho, Mishima-gun, Osaka F-term (reference) at Sumitomo Special Metals Co., Ltd. Yamazaki Works 5E043 AA01 AB01 EB01 EB02 5E070 AA01 AB04 AB10 BA11 CA13 CA15 CA16 CA20 DA11 DB02 DB06 EA02 EB03

Claims (21)

[Claims] An inductor comprising a plurality of inductor elements each having a magnetic core and a winding provided around the magnetic core, wherein the plurality of inductor elements are magnetically coupled to each other to form a closed magnetic circuit. The connection of the windings of the plurality of inductors is performed in accordance with the winding direction of each of the windings of each of the plurality of inductor elements, and the plurality of inductors are disposed. Inductor. 2. A method according to claim 1, wherein said plurality of inductor elements are disposed substantially in parallel with each other, and winding directions of said windings of adjacent ones of said plurality of inductor elements are opposite to each other. The inductor according to claim 1, wherein the windings are connected in parallel. 3. A method according to claim 1, wherein the plurality of inductor elements are disposed substantially in parallel with each other, and winding directions of the windings of adjacent ones of the plurality of inductor elements are set to be the same. The inductor according to claim 1, wherein the windings are connected in series. 4. A method for fixing the plurality of inductors by fixing both ends of the magnetic core of each of the plurality of inductor elements and the both ends where the winding is located therebetween or in the vicinity thereof. The inductor according to any one of claims 1 to 3, wherein the element is positioned and fixed. 5. A conductive terminal is fixed to each of said magnetic cores of said plurality of inductor elements at or near said both ends thereof, and said winding ends of each of said plurality of inductor elements are fixed to said both ends. Each of the plurality of inductor elements is electrically connected to the terminal fixed to the both ends of the magnetic material or in the vicinity thereof, and the terminals respectively fixed to the both ends of the magnetic material of the plurality of inductor elements or in the vicinity thereof are used. The inductor according to claim 4, wherein the plurality of inductor elements are positioned and fixed. 6. An inductor according to claim 1, wherein said inductor is conductive.
Wherein the plurality of inductor elements are disposed substantially in parallel with each other, and one end of the two ends of the magnetic core of each of the plurality of inductor elements or the vicinity thereof is the first end. By fixing the other end or the vicinity of both ends of the magnetic core of each of the plurality of inductor elements to the conductive second terminal. The positioning of the plurality of inductor elements, and both ends of the winding of each of the plurality of inductor elements are electrically connected to the first and second terminals, respectively. The inductor as described. 7. A method according to claim 1, wherein said terminals or said first and second terminals and said both ends of said magnetic core of each of said plurality of inductor elements or said vicinity thereof are covered with a resin mold. The inductor according to claim 5. 8. The inductor further includes a substrate and a plurality of lands formed on the substrate, and the inductors are fixed to the magnetic core at each of the two ends or in the vicinity thereof. 6. The inductor according to claim 5, wherein the plurality of inductor elements are positioned and fixed on the substrate by fixing the terminals to the plurality of lands, respectively. 9. The plurality of inductor elements further comprising: a substrate; and first and second lands formed on the substrate, wherein the plurality of inductor elements are disposed substantially in parallel with each other; The terminals respectively fixed to one end or near the one end of both ends of each of the magnetic cores are commonly fixed to the first lands, respectively, and the magnetic properties of each of the plurality of inductor elements are fixed. The plurality of inductor elements are positioned and fixed on the substrate by fixing the terminals fixed to the other end of the body core at or near the other end thereof in common to the second land, respectively. 6. The inductor according to claim 5, wherein: 10. The magnetic core of each of the plurality of inductor elements is a flat magnetic core, and the conductive terminal or the first and second terminals are connected to the flat magnetic core. The inductor according to any one of claims 5 to 9, wherein the inductor is fixed to one main surface of the body core. 11. The terminal according to claim 10, wherein said terminal or said first and second terminals are flat terminals and are fixed to said one main surface of said flat magnetic core. The inductor as described. 12. The method according to claim 1, wherein the plurality of inductor elements are disposed substantially in parallel with each other, and a distance between the windings of adjacent ones of the plurality of inductor elements is set to 5 mm or less. 12. The inductor according to any one of claims 1 to 11. 13. An electronic device comprising the inductor according to claim 1. Description: 14. An electronic device comprising a plurality of inductors each having a magnetic core and a winding provided around the magnetic core, wherein the plurality of inductors are magnetically coupled to each other to form a closed magnetic path. As described above, the electronic device is characterized in that the windings of the plurality of inductors are connected to each other in accordance with the respective winding directions of the windings of the plurality of inductors, and the plurality of inductors are disposed. . 15. A method according to claim 15, wherein the plurality of inductors are disposed substantially in parallel with each other, and winding directions of the windings of adjacent ones of the plurality of inductors are opposite to each other. The electronic device according to claim 14, wherein are connected in parallel. 16. A method according to claim 1, wherein the plurality of inductors are disposed substantially in parallel with each other, and winding directions of the windings of adjacent ones of the plurality of inductors are the same. The electronic device according to claim 14, wherein are connected in series. 17. A method for fixing the plurality of inductors by fixing both ends of the magnetic core at each end of the plurality of inductors and the ends located near the windings or in the vicinity thereof. 17. The electronic device according to claim 14, wherein the electronic device is positioned and fixed. 18. A conductive terminal is fixed to each of said magnetic cores at or near said both ends of said magnetic core of each of said plurality of inductors, and both ends of said winding of each of said plurality of inductors are connected to said magnetic material core. Electrically connected to the terminals respectively fixed at the both ends or in the vicinity thereof, and using the terminals respectively fixed to the both ends or the vicinity of the magnetic material of each of the plurality of inductors. 18. The electronic device according to claim 17, wherein a plurality of inductors are positioned and fixed. 19. The magnetic core of each of the plurality of inductors is a flat magnetic core, and the conductive terminal or the first and second terminals are the flat magnetic core. 19. The electronic device according to claim 18, wherein the electronic device is fixed to one main surface of the core. 20. The terminal according to claim 19, wherein the terminal or the first and second terminals are flat terminals and are fixed to the one main surface of the flat magnetic core. Electronic device as described. 21. The method according to claim 14, wherein said plurality of inductors are disposed substantially in parallel with each other, and a distance between said windings of adjacent ones of said plurality of inductors is set to 5 mm or less. Electronic equipment according to any one of the above.