JP2023023104A - Coil component - Google Patents

Abstract

To provide a coil component having a structure capable of enhancing inductance.SOLUTION: A coil component 100 includes a core molded body 10, a first mounting terminal portion 51, a first current path 42, a second mounting terminal portion 55, a second current path 43, and a first return current path 31 and a second return current path 36 which are branched from a branch portion 44 which is an end portion 42b of the first current path 42 opposite to the first mounting terminal portion 51 side. The first return current path 31 has a first one end portion 32 at the branch portion 44, extends toward a first other end portion 33, and, is electrically connected, at the first other end portion 33, to a confluence portion 45 which is an end portion 43a on the first mounting terminal portion 51 side in the second current path 43. The second return current path 36 extends toward a second other end portion 38, and is electrically connected to the confluence portion 45 at the second other end portion 38.SELECTED DRAWING: Figure 1

Description

The present invention relates to coil components.

As a coil component, for example, there is one described in Patent Document 1.
The coil component of Patent Document 1 includes a core molded body (described as a magnetic core in the same document), a terminal portion, a current path connected to the terminal portion (described as a conductor portion in the same document), It has Among these, the current path includes an insertion portion that is inserted through the magnetic core, and the insertion portion includes a first portion and a second portion that is disposed over the first portion. .

JP 2020-198395 A

According to the studies of the inventors of the present application, the coil component of Patent Document 1 still has room for improvement in terms of improving the inductance.

The present invention has been made in view of the above problems, and provides a coil component having a structure capable of improving inductance.

The present invention provides a core molded body made of a magnetic material,
a first mounting terminal portion;
a first current path connected to the first mounting terminal;
a second mounting terminal portion;
a second current path connected to the second mounting terminal portion and extending in parallel to the first current path;
a first return current path and a second return current path branching off from a branch portion that is an end portion of the first current path opposite to the first mounting terminal portion;
has
The first return current path has a first one end portion at the branch portion, and a first return current path located near an end portion of the first current path on the first mounting terminal side from the first one end portion. extends toward the end, and is electrically connected at the first other end to a confluence portion that is the end of the second current path on the first mounting terminal side,
The second return current path has a second one end portion at the branch portion, and a second return current path located in the vicinity of the first mounting terminal portion side end portion of the first current path from the second one end portion. A coil component extending toward an end portion and electrically connected to the confluence portion at the second other end portion is provided.

According to the present invention, a coil component having a structure capable of improving inductance is provided.

1 is a perspective view of a coil component according to a first embodiment; FIG. 1 is an exploded perspective view of a coil component according to a first embodiment; FIG. 1 is a front view of a coil component according to a first embodiment; FIG. It is a side view of the coil component concerning a 1st embodiment. 5(a) and 5(b) are plan views of the coil component according to the first embodiment, of which the core molded body is omitted in FIG. 5(b). 6(a) is a cross-sectional view taken along line AA shown in FIG. 5(a), and FIG. 6(b) is a partially enlarged view of portion A shown in FIG. 6(a). 7(a) is a cross-sectional view taken along line BB shown in FIG. 5(a), and FIG. 7(b) is a partially enlarged view of the portion A shown in FIG. 7(a). FIG. 11 is a perspective view of a coil component according to a second embodiment; 9(a) and 9(b) are plan views of the coil component according to the second embodiment, of which the core molded body is omitted in FIG. 9(b). FIG. 11 is a side view of a coil component according to a second embodiment; FIG. 11 is a perspective view of a coil component according to a third embodiment; FIG. 11 is an exploded perspective view of a coil component according to a third embodiment; 13(a) and 13(b) are plan views of the coil component according to the third embodiment, of which the core molded body is omitted in FIG. 13(b). 14(a) is a plan view of the first conductive member in the third embodiment, FIG. 14(b) is a side view of the first conductive member in the third embodiment, and FIG. 14(c) is a third It is a top view of the 2nd electric conduction member in an embodiment, and Drawing 14 (d) is a side view of the 2nd electric conduction member in a 3rd embodiment. FIG. 11 is a perspective view of a coil component according to a fourth embodiment; FIG. 11 is an exploded perspective view of a coil component according to a fourth embodiment; FIG. 11 is a perspective view of a coil component according to a fifth embodiment; FIGS. 18(a) and 18(b) are plan views of the coil component according to the fifth embodiment, of which the core molded body is omitted in FIG. 18(b). FIG. 11 is a perspective view of a coil component according to a sixth embodiment; 20(a) and 20(b) are plan views of the coil component according to the sixth embodiment, of which the core molded body is omitted in FIG. 20(b). FIG. 11 is a side view of a coil component according to a sixth embodiment;

An embodiment of the present invention will be described below with reference to FIGS. 1 to 21. FIG. In addition, in all the drawings, the same reference numerals are given to the same constituent elements, and the description thereof will be omitted as appropriate.

[First embodiment]
First, a first embodiment will be described with reference to FIGS. 1 to 7B.
As shown in any one of FIGS. 1 to 7B, the coil component 100 according to the present embodiment includes a core molded body 10 (FIG. 1, etc.) made of a magnetic material, and a first mounting terminal portion. 51 (FIG. 4, etc.), a first current path 42 (FIGS. 5A and 5B, etc.) connected to the first mounting terminal portion 51, a second mounting terminal portion 55, and a second mounting A second current path 43 (FIGS. 5A and 5B, etc.) connected to the terminal portion 55 (FIG. 4, etc.) and extending in parallel with the first current path 42; , the first return current path 31 and the second return current path 36 (FIG. 5 ( a) and FIG. 5(b), etc.).
As shown in FIGS. 1, 5(a), 5(b), etc., the first return current path 31 has a first one end 32 at the branch portion 44 . The first return current path 31 extends from the first one end 32 toward the first other end 33 located near the end 42a of the first current path 42 on the first mounting terminal portion 51 side. The first other end portion 33 of the first return current path 31 is electrically connected to a junction portion 45 that is an end portion 43 a of the second current path 43 on the first mounting terminal portion 51 side.
The second return current path 36 has a second end portion 37 at the branch portion 44 . The second return current path 36 extends from the second one end 37 toward the second other end 38 located near the end 42a of the first current path 42 on the first mounting terminal portion 51 side. The second return current path 36 is electrically connected to the confluence portion 45 at the second other end portion 38 .
Here, "parallel" does not necessarily mean parallel, and the first current path 42 and the second current path 43 may extend in directions that intersect each other. In this case, for example, the angle formed by the first current path 42 and the second current path 43 shall be less than 45 degrees. Also, the first current path 42 and the second current path 43 may be arranged on the same plane, or may be in a twisted relationship. When the first current path 42 and the second current path 43 are in a twisted relationship, the maximum angle formed by the first current path 42 and the second current path 43 is 45 degrees when viewed from all directions. is less than

According to this embodiment, the coil component 100 includes the first return current path 31 and the second return current path 36 electrically connected to the first current path 42 and the second current path 43, respectively. The first return current path 31 branches from an end portion 42b (branch portion 44) of the first current path 42 opposite to the first mounting terminal portion 51 side. It is electrically connected to the confluence portion 45 in the vicinity of the end portion 42 a on the mounting terminal portion 51 side (first other end portion 33 ). Similarly, the second return current path 36 branches off from an end portion 42b (branch portion 44) of the first current path 42 opposite to the first mounting terminal portion 51 side. It is electrically connected to the confluence portion 45 in the vicinity of the end portion 42 a (the second other end portion 38 ) on the one mounting terminal portion 51 side.
As a result, compared to the case where the coil component 100 does not include the first return current path 31 and the second return current path 36, the number of turns of the current path of the coil component 100 can be better secured. More specifically, the current applied from the first mounting terminal portion 51 flows through the first current path 42 toward the branch portion 44 side (the side opposite to the first mounting terminal portion 51), and the branch portion At 44, it branches into the first return current path 31 and the second return current path 36, respectively. Then, the current branched to the first return current path 31 and the current branched to the second return current path 36 flow toward the merging portion 45 side (the first mounting terminal portion 51 side). merge. The combined current flows through the second current path 43 toward the end portion 43b (the second mounting terminal portion 55 side) of the second current path 43 opposite to the first mounting terminal portion 51 side. That is, the current applied from the first mounting terminal portion 51 flows toward the side opposite to the first mounting terminal portion 51 side, then flows toward the first mounting terminal portion 51 side, and again flows toward the first mounting terminal portion 51 side. The coil component 100 is configured so that the current flows in the opposite direction. Therefore, the number of turns of the current path of coil component 100 can be sufficiently secured (for example, more than one turn), so that the inductance of coil component 100 can be improved.
In addition, the current applied to the first mounting terminal portion 51 flows in the first current path 42 from the first mounting terminal portion 51 side (end portion 42a side) to the side opposite to the first mounting terminal portion 51 (end portion 42a). 42b side). Similarly, the current flowing into the second current path 43 from the confluence portion 45 flows from the first mounting terminal portion 51 side (end portion 43a side) to the side opposite to the first mounting terminal portion 51 (end portion 43b side). flow toward That is, since the directions of the currents flowing through the first current path 42 and the second current path 43 extending in parallel with each other are substantially the same, the magnetic flux loop of the first current path 42 and the second current path 43 As a result, a large magnetic flux loop is formed around the first current path 42 and the second current path 43 . Therefore, the inductance of coil component 100 can be further improved.
Thus, according to this embodiment, it is possible to realize the coil component 100 having a structure capable of improving the inductance.
In addition, since the number of turns of the current path of the coil component 100 can be sufficiently secured without using coil windings, the easiness of manufacturing the coil component 100 can be improved.

In the following description, the vertical direction will be referred to as the Z direction. The bottom (lower side) is the side on which the first mounting terminal portion 51 and the second mounting terminal portion 55 are arranged, that is, the mounting surface side of the coil component 100 . However, the positional relationship (especially the vertical positional relationship) of each part during manufacture and use of the coil component 100 is not limited to the positional relationship described in this specification.
The first current path 42 extends in a direction perpendicular to the Z direction. The extending direction of the first current path 42 is called the Y direction, one side of the Y direction is called the front (forward), and the other is called the rear (rear).
A direction orthogonal to both the Y direction and the Z direction is called an X direction, one of which is called the left (left) and the other is called the right (right).
These directions are indicated in each figure.
Furthermore, in the Y direction, the center side of the first current path 42 is called the inner side (inner side), and the side opposite to the inner side is called the outer side (outer side). Similarly, in the X direction, the center side of the first current path 42 is called the inner side (inner side), and the side opposite to the inner side is called the outer side (outer side).
A direction (direction) orthogonal to the Z direction is called horizontal (horizontal direction), and a direction (direction) along the Z direction is called vertical (vertical direction).
Further, unless otherwise specified, the positional relationship of each part of the coil component 100 is described in a state where the coil component 100 is manufactured by assembling the parts of the coil component 100 to each other.

As shown in FIGS. 1 and 2, in the case of this embodiment, the core molded body 10 is formed, for example, in a substantially cubic shape. More specifically, the core molded body 10 has a front surface 12 facing forward, a rear surface 13 facing rearward, a pair of left and right side surfaces 14 facing left and right respectively, and a pair of side surfaces 14 facing upward. It has an upper surface 15 facing downwards and a lower surface 16 facing downwards.
The core molded body 10 is formed, for example, in a bilaterally symmetrical and longitudinally symmetrical shape.
Further, as shown in FIG. 4 , for example, a pair of front and rear recesses 17 are formed in the lower surface 16 . The pair of front and rear recesses 17 are slightly recessed upward from the lower surface 16 . The bottom surface of each of the pair of front and rear recesses 17 is, for example, flat and arranged horizontally.

The core molded body 10 is, for example, a composite magnetic body formed by compression-molding a material containing metal magnetic powder and thermosetting resin, and the entire core molded body 10 is integrally molded by this composite magnetic body. ing.
With such a configuration, a high magnetic permeability of the core molded body 10 can be realized, so that the inductance of the coil component 100 can be further improved.

In the case of this embodiment, as shown in FIGS. 1, 2, 5(a) and 5(b), the coil component 100 has, for example, a first mounting terminal portion 51 and a first current path 42. A second conductive member 72 and a second conductive member 72 having a second mounting terminal portion 55 and a second current path 43 are provided. In other words, the first mounting terminal portion 51 and the first current path 42 are each configured by a portion of the first conductive member 71, and the second mounting terminal portion 55 and the second current path 43 are configured by the second mounting terminal portion 55 and the second current path 43. It is configured by each part of the conductive member 72 .
As a result, in the manufacturing process of the coil component 100, a step of joining the first mounting terminal portion 51 and the first current path 42 (for example, resistance welding, laser welding, etc.) and a step of joining the second mounting terminal portion 55 and the second mounting terminal portion 55 to each other and the step of joining (same as above) the current path 43 to each other can be omitted. Therefore, the ease of manufacturing the coil component 100 can be further improved.

More specifically, as shown in FIGS. 2 and 4 , the first conductive member 71 includes the first mounting terminal portion 51 and the first current path 42 in addition to the first mounting terminal portion 51 and the first current path 42 . It further has a first outer surface arrangement portion 46 interposed between. That is, the first mounting terminal portion 51 is connected to the first current path 42 (first portion 71a) via the first outer surface placement portion 46 .
Similarly, in addition to the second mounting terminal portion 55 and the second current path 43 , the second conductive member 72 has a second outer surface arrangement interposed between the second mounting terminal portion 55 and the second current path 43 . It further has a portion 47 . That is, the second mounting terminal portion 55 is connected to the second current path 43 (first portion 72a) via the second outer surface arrangement portion 47, for example.

In the case of this embodiment, the first conductive member 71 and the second conductive member 72 are formed to have the same shape and the same size, and are arranged in positions that are reversed front to back and left to right.
The first conductive member 71 includes, for example, a first portion 71a formed in a flat plate shape extending in the front-rear direction, and a plate-like portion connected to the first portion 71a. has a vertical portion facing the front-rear direction, and a horizontal portion, which is a plate-like portion connected to the vertical portion and whose plate surface faces the up-down direction. Similarly, the second conductive member 72 has, for example, a first portion 72a formed in a plate shape extending in the front-rear direction, a vertical portion, and a horizontal portion.
In the case of the present embodiment, as an example, the first portion 71a of the first conductive member 71 constitutes the first current path 42, and the vertical portion of the first conductive member 71 constitutes the first outer surface arrangement portion 46. The horizontal portion of the first conductive member 71 constitutes the first mounting terminal portion 51 . Similarly, as an example, the first portion 72a of the second conductive member 72 constitutes the second current path 43, the vertical portion of the second conductive member 72 constitutes the second outer surface arrangement portion 47, and the second The horizontal portion of the second conductive member 72 constitutes the second mounting terminal portion 55 .

The first current path 42 (first portion 71a) and the second current path 43 (first portion 72a) are set to have the same shape and the same size, for example. Each of the first current path 42 and the second current path 43 is formed in a substantially rectangular shape elongated in the front-rear direction in plan view. The first current path 42 and the second current path 43 are formed flat and arranged horizontally.
The first mounting terminal portion 51 and the second mounting terminal portion 55 are set to have the same shape and the same size, for example. Each of the first mounting terminal portion 51 and the second mounting terminal portion 55 is formed in a substantially rectangular shape elongated in the horizontal direction in a plan view. Each of the first mounting terminal portion 51 and the second mounting terminal portion 55 is formed flat and arranged horizontally.
The first outer surface arrangement portion 46 and the second outer surface arrangement portion 47 are set to have the same shape and the same size, for example. Each of the first outer surface arrangement portion 46 and the second outer surface arrangement portion 47 is formed flat and arranged vertically.
As shown in FIG. 3, the lateral width dimension of the upper end portion of the second outer surface placement portion 47 is set to the same dimension as the lateral width dimension of the second current path 43, and the lower end portion of the second outer surface placement portion 47 is set to the same dimension as the lateral width dimension of the second current path 43. is set to a dimension larger than the left-right width dimension of the second current path 43 . Therefore, the lateral width dimension of the upper end portion of the second outer surface placement portion 47 is smaller than the lateral width dimension of the lower end portion of the second outer surface placement portion 47 . As shown in FIG. 3, the middle portion (portion between the upper end portion and the lower end portion) of the second outer surface arrangement portion 47 in the vertical direction widens downward in a one-sided taper shape in the front view. ing. More specifically, the left edge of the middle portion of the second outer surface arrangement portion 47 extends vertically, while the right edge of the middle portion is inclined downward to the right. .
Similarly, the lateral width dimension of the upper end portion of the first outer surface placement portion 46 is smaller than the lateral width dimension of the lower end portion of the first outer surface placement portion 46 . An intermediate portion (a portion between the upper end portion and the lower end portion) of the first outer surface arranged portion 46 in the vertical direction widens downward in a one-sided taper shape in a horizontal width dimension in a plan view. More specifically, the right edge of the intermediate portion of the first outer surface arrangement portion 46 extends vertically, while the left edge of the intermediate portion is inclined downward to the left side. . In addition, the first outer surface arrangement portion 46 and the second outer surface arrangement portion 47 face each other, and in particular, the lower end portion of the first outer surface arrangement portion 46 and the lower end portion of the second outer surface arrangement portion 47 face each other as a whole. are doing.

In the case of this embodiment, as shown in FIG. 4, the first mounting terminal portion 51 is arranged on the rear end side of the first current path 42 . Therefore, the rear end portion of the first current path 42 constitutes the end portion 42a of the first current path 42 on the side of the first mounting terminal portion 51, and the front end portion of the first current path 42 constitutes the first mounting terminal portion 51 side of the first current path 42. An end portion 42 b (branch portion 44 ) of the current path 42 on the side opposite to the first mounting terminal portion 51 side is formed. In addition, as an example, the rear end portion of the second current path 43 constitutes the end portion 43a (joint portion 45) of the second current path 43 on the first mounting terminal portion 51 side, and the second current path 43 constitutes an end portion 43b of the second current path 43 on the side opposite to the first mounting terminal portion 51 side.
More specifically, the upper edge of the first outer surface arrangement portion 46 is, for example, connected to the trailing edge of the first current path 42 and extends downward from the trailing edge. On the other hand, the lower edge of the first outer surface arrangement portion 46 is connected to the rear edge of the first mounting terminal portion 51 . Similarly, the upper edge of the second outer surface arrangement portion 47 is connected to, for example, the front edge of the second current path 43 and extends downward from the front edge. On the other hand, the lower edge of the second outer surface arrangement portion 47 is connected to the front edge of the second mounting terminal portion 55 .
A boundary portion 46a between the first current path 42 and the first outer surface arrangement portion 46 is curved in an arc shape (a convex arc shape toward the upper rear side) in a side view. Similarly, the second outer surface arrangement portion 47 is connected to the front edge of the second current path 43 and extends downward from the front edge. A boundary portion 47a between the second current path 43 and the second outer surface arrangement portion 47 is curved in an arc shape (a convex arc shape toward the upper rear side) in a side view.

In the case of the present embodiment, as an example, the lateral dimension of each of the lower end of the first outer surface arrangement portion 46 and the lower end of the second outer surface arranged portion 47 is equal to the lateral width dimension of the first current path 42 and the lateral dimension of the second current path 43 . It is set to a dimension slightly larger than the total value with the width dimension.
Further, the lateral width dimension of the lower end of the first outer surface arrangement portion 46 is set to be, for example, the same width dimension as the lateral width dimension of the first mounting terminal portion 51 . Similarly, the lateral width dimension of the lower end of the second outer surface arrangement portion 47 is set to the same width dimension as the lateral width dimension of the second mounting terminal portion 55, for example.
As a result, the cross-sectional area of each of the first outer surface arrangement portion 46 and the second outer surface arrangement portion 47 can be sufficiently secured, so that the direct current resistance in the first outer surface arrangement portion 46 and the second outer surface arrangement portion 47 can be suppressed. Moreover, the structural strength of the first outer surface arrangement portion 46 and the second outer surface arrangement portion 47 can be sufficiently ensured.

Further, in the case of the present embodiment, each of the first conductive member 71 and the second conductive member 72 is made of a rectangular wire.
This makes it possible to easily secure a sufficient cross-sectional area for each of the first current path 42 and the second current path 43 .
Furthermore, by bending a rectangular wire, the first conductive member 71 having the first mounting terminal portion 51 and the first current path 42 can be easily formed. In the case of this embodiment, the first conductive member 71 having the first mounting terminal portion 51, the first outer surface arrangement portion 46, and the first current path 42 can be easily formed. Similarly, by bending a rectangular wire, the second conductive member 72 having the second mounting terminal portion 55 and the second current path 43 can be easily formed. In the case of this embodiment, the second conductive member 72 having the second mounting terminal portion 55, the second outer surface arrangement portion 47, and the second current path 43 can be easily formed.
More specifically, the flat wire forming the first conductive member 71 is, for example, bent at the boundary between the first mounting terminal portion 51 and the first outer surface arrangement portion 46 (for example, bent at 90 degrees). ), and is also bent (eg, bent 90 degrees) at the boundary between the first current path 42 and the first outer surface arrangement portion 46 . As a result, the first current path 42 is arranged orthogonally to the first outer surface arrangement portion 46 and parallel to the first mounting terminal portion 51 .
Similarly, the rectangular wire forming the second conductive member 72 is, for example, bent at the boundary between the second mounting terminal portion 55 and the second outer surface arrangement portion 47 (for example, bent 90 degrees), The boundary between the second outer surface arrangement portion 47 and the second mounting terminal portion 55 is also bent (eg, bent 90 degrees). As a result, the second current path 43 is arranged orthogonally to the second outer surface arrangement portion 47 and parallel to the second mounting terminal portion 55 .

As described above, each of the first conductive member 71 and the second conductive member 72 is composed of a rectangular wire. Therefore, the thickness of the first conductive member 71 is substantially uniform over the entire first conductive member 71, for example. Similarly, the thickness of the second conductive member 72 is, for example, substantially uniform over its entirety. Furthermore, the first conductive member 71 and the second conductive member 72 are formed to have the same thickness, for example. Therefore, the thickness dimension of the first current path 42 and the thickness dimension of the second current path 43 are substantially the same.
However, the present invention is not limited to this example, and the thickness dimension of the first conductive member 71 and the thickness dimension of the second conductive member 72 may be different from each other. That is, the thickness dimension of the first current path 42 and the thickness dimension of the second current path 43 may be different dimensions.

Here, in the case of this embodiment, the first current path 42 and the second current path 43 are adjacent to each other with an insulating film interposed therebetween.
Accordingly, even if the first current path 42 and the second current path 43 are arranged in close proximity to each other or in contact with each other, it is possible to prevent the first current path 42 and the second current path 43 from being short-circuited.
More specifically, for example, on the outer surface of the first conductive member 71, the entire area excluding at least a portion of the branch portion 44 (the end portion 42b on the side opposite to the first mounting terminal portion 51 side in the first current path 42) is coated with an insulating film. In other words, in the first conductive member 71, at least a portion of the portion (end portion 42b) forming the branch portion 44 is a non-insulating film region.
Similarly, for example, an insulating film is applied to the entire outer surface of the second conductive member 72 except for at least a portion of the junction portion 45 (the end portion 43a of the second current path 43 on the first mounting terminal portion 51 side). ing. In other words, in the second conductive member 72, at least a portion of the portion (end portion 43a) forming the confluence portion 45 is a non-insulating film region.
In this embodiment, the entire top surface of the end portion 42b of the first current path 42 is a non-insulating region, and the entire top surface of the end portion 43a of the second current path 43 is an insulating film. It is a non-formation region.
In addition, in the present invention, it is sufficient that the insulating film is formed at least on the surfaces facing each of the first current path 42 and the second current path 43 .
Moreover, as shown in FIGS. 6B and 7B, each of the end portion 42b (branch portion 44) of the first current path 42 and the end portion 43a (joint portion 45) of the second current path 43 The upper surface is, for example, locally slightly raised upward.

As shown in FIGS. 1 and 2 , the first return current path 31 and the second return current path 36 are composed of, for example, the second conductive member 72 and a conductive member different from the second conductive member 72 .
Thereby, the shape of each member can be made into a simple shape.
Also, it is possible to increase the cross-sectional area of each of the first return current path 31 and the second return current path 36, which are formed of separate conductive members, so that each of the first current paths 42 (first conductive The DC resistance of the current path can be reduced while suppressing the thickness of the member 71) and the second current path 43 (second conductive member 72). Therefore, the first conductive member 71 and the second conductive member 72 can be easily bent (with a light force). Therefore, it is possible to improve the manufacturability of the coil component 100 while reducing the DC resistance of the current path.

As shown in FIGS. 2, 5B, etc., in the case of the present embodiment, the coil component 100 is a third conductive member having a first return current path 31 and a second return current path 36 as separate conductive members. A member 30 is provided. In other words, the first return current path 31 and the second return current path 36 are each configured by a portion of the third conductive member 30 .
Accordingly, since the first return current path 31 and the second return current path 36 are configured by the same member, by assembling the third conductive member 30 to the first current path 42 and the second current path 43, the The first return current path 31 and the second return current path 36 can be combined with the first current path 42 and the second current path 43 at the same time. Therefore, the ease of manufacturing the coil component 100 can be improved.
The third conductive member 30 is, for example, a conductive ring member formed in a ring shape.
Thereby, the structural strength of the third conductive member 30 can be sufficiently ensured.
As shown in FIGS. 5(a) and 5(b), the ring conductive member (third conductive member 30) is, for example, formed in a substantially square shape with rounded corners in plan view, and has a pair of front and rear sides. and a pair of left and right sides. A central portion of the third conductive member 30 forms a gap portion 30a.
The pair of front and rear side portions, for example, extend in the left-right direction and are arranged parallel to each other. The pair of left and right side portions, for example, extend in the front-rear direction and are arranged parallel to each other.
The planar shape of the conductive ring member is not particularly limited, and may be, for example, a polygonal shape other than a rectangular shape, a circular shape, an elliptical shape, or the like.

In the case of this embodiment, the third conductive member 30, the first conductive member 71 and the second conductive member 72 are made of, for example, the same type of conductive material (eg, copper, etc.). However, since the insulating film is formed on the first conductive member 71 and the second conductive member 72 as described above, the insulating film may or may not be formed on the third conductive member 30 . It doesn't have to be. However, when the insulating film is not formed on the first conductive member 71 and the second conductive member 72 , the insulating film is formed on the third conductive member 30 . In this case, the insulating film is not formed in the portions of the third conductive member 30 corresponding to the branching portion 44 and the merging portion 45 .

In the case of this embodiment, the thickness of the third conductive member 30 is, for example, substantially uniform over its entirety. Therefore, the first return current path 31 and the second return current path 36 are formed to have the same thickness dimension as each other, for example. However, the present invention is not limited to this example. They can be different from each other.
Further, the thickness of the third conductive member 30 (the thickness dimension of the first return current path 31 and the thickness dimension of the second return current path 36) is the thickness dimension of the first current path 42 and the thickness dimension of the second current path 43. are set to dimensions larger than each of the On the other hand, the width dimension of the third conductive member 30 (the dimension in the horizontal direction and in the direction orthogonal to the extending direction) is, for example, the lateral width dimension of the first current path 42 and the lateral width dimension of the second current path 43. The dimensions are set to be approximately the same as each other.
As a result, a sufficient cross-sectional area can be secured for each of the first return current path 31 and the second return current path 36, so that the DC resistance of the entire current path of the coil component 100 can be further reduced. That is, it is possible to improve the inductance of the coil component 100 while reducing the DC resistance of the current path.
However, for example, the cross-sectional area of each of the first current path 42 and the second current path 43 may be larger than the cross-sectional area of each of the first return current path 31 and the second return current path 36 .

In the case of the present embodiment, the cross-sectional area of the first return current path 31 is, for example, preferably 0.5 to 10 times the cross-sectional area of the first current path 42, more preferably 0.5 times or more. 3 times or less.
The cross-sectional area of the second return current path 36 is, for example, preferably 0.5 to 10 times, more preferably 0.5 to 3 times the cross-sectional area of the second current path 43 .

In the case of this embodiment, the core molded body 10 includes, for example, a first current path 42, a second current path 43, a first return current path 31, and a second return current path .
Thereby, leakage magnetic flux of the coil component 100 can be suppressed.
More specifically, as shown in FIGS. 1, 3, 4 and 5(a), the entirety of each of the first current path 42, the second current path 43 and the third conductive member 30 (however, the boundary portion 46a and 47a) are buried inside the core molded body 10. As shown in FIG. That is, the core molded body 10 is integrally molded in such a manner that the first current path 42 , the second current path 43 and the third conductive member 30 are entirely embedded in the core molded body 10 .
On the other hand, each of the first outer surface arrangement portion 46 , the second outer surface arrangement portion 47 , the first mounting terminal portion 51 and the second mounting terminal portion 55 is arranged outside the core molded body 10 .
More specifically, the inner surface (front surface) of the first outer surface arrangement portion 46 is arranged vertically along the front surface 12 of the core molded body 10, for example. Similarly, the inner surface (rear surface) of the second outer surface arrangement portion 47 is arranged vertically along the rear surface 13 of the core molded body 10, for example.
As shown in FIG. 4, the first mounting terminal portion 51 is horizontally arranged along the bottom surface of the rear concave portion 17 of the pair of front and rear concave portions 17 . In the vertical direction, the upper surface of the first mounting terminal portion 51 faces the bottom surface of the recess 17 on the rear side, and is in close proximity to or in contact with the bottom surface (surface contact).
Similarly, the second mounting terminal portion 55 is horizontally arranged along the bottom surface of the front concave portion 17 of the pair of front and rear concave portions 17 . In the vertical direction, the bottom surface of the groove on the front side and the top surface of the second mounting terminal portion 55 face each other, and are in proximity to or in contact with the bottom surface (surface contact).
The first mounting terminal portion 51 and the second mounting terminal portion 55 are arranged at substantially the same height position.
The height positions of the lower surfaces of the first mounting terminal portion 51 and the second mounting terminal portion 55 are lower than the height position of the lower surface 16 of the core molded body 10 . Thereby, when coil component 100 is mounted on a substrate or the like (not shown), interference between core molded body 10 and the substrate or the like can be suppressed.

The first outer surface arrangement portion 46 and the second outer surface arrangement portion 47 may be adhesively fixed to the outer surface of the core molded body 10, for example. More specifically, the inner surface of the first outer surface arrangement portion 46 is adhesively fixed (face-bonded) to the back surface 13 of the core molded body 10 , and the inner surface of the second outer surface arranged portion 47 is attached to the core molded body 10 . may be adhesively fixed (face-bonded) to the front surface 12 of the .

In this embodiment, as shown in FIGS. 5(a) and 5(b), the first current path 42 and the second current path 43 are arranged side by side, and the conductive ring member (third conductive ring member) The member 30 ) is placed over the first current path 42 and the second current path 43 .
As a result, in the portion where the third conductive member 30 and the first current path 42 overlap and are electrically connected, the cross-sectional area of the current path (the cross-sectional area of the conductive ring member and the cross-sectional area of the first current path 42 area) can be sufficiently secured. Similarly, in the portion where the third conductive member 30 and the second current path 43 overlap each other and are electrically connected, the cross-sectional area of the current path (the cross-sectional area of the conductive ring member and the cross-sectional area of the second current path 43 area) can be sufficiently secured.
More specifically, the first current path 42 and the second current path 43 are arranged at substantially the same height position. The top surface of the first current path 42 and the top surface of the second current path 43 are flush with each other, and the bottom surface of the first current path 42 and the bottom surface of the second current path 43 are flush with each other. It is Further, as described above, the extending direction of the first current path 42 is the front-rear direction, and the extending direction of the second current path 43 is also the front-rear direction. That is, the extending direction of the first current path 42 and the extending direction of the second current path 43 are the same direction, and the first current path 42 and the second current path 43 extend parallel to each other. . The direction in which the first current path 42 and the second current path 43 are arranged is the horizontal direction, which is the left-right direction in this embodiment. As shown in FIGS. 5A and 5B, in this embodiment, the first current path 42 and the second current path 43 are arranged slightly apart from each other in the left-right direction. However, since the insulating film is formed on the first conductive member 71 and the second conductive member 72 as described above, the first current path 42 and the second current path 43 are arranged in contact with each other. may
The third conductive member 30 is, for example, horizontally arranged on the upper surface of the first current path 42 and the upper surface of the second current path 43 .

Here, as shown in FIG. 5, as an example, in the third conductive member 30, the portion extending counterclockwise from the branch portion 44 to the merging portion 45 is the first return current path 31, which joins from the branch portion 44. The portion that extends clockwise to the portion 45 is the second return current path 36 .
More specifically, as described above, in the case of the present embodiment, the upper surface of the end portion 42b (branch portion 44) of the first current path 42 is a non-insulating region, and the second current path 43 The upper surface of the end portion 43a (the confluence portion 45) is a non-formation region of the insulating film.
Then, as shown in FIGS. 6A to 7B, a portion of the lower surface of the third conductive member 30 is the upper surface of the end portion 42b (branch portion 44) of the first current path 42 and the second current path. It is in surface contact with each of the upper surfaces of the end portion 43a of 43 (confluence portion 45). As a result, each of the third conductive member 30 , the first return current path 31 and the second return current path 36 is electrically connected to the first current path 42 at the branch portion 44 , and is connected to the second current path at the junction portion 45 . It is electrically connected with the current path 43 .
In the case of the present embodiment, the third conductive member 30 and the first current path 42 may be joined via, for example, a conductive adhesive, or may be joined together by resistance welding. Similarly, the third conductive member 30 and the second current path 43 may be joined via, for example, a conductive adhesive, or may be joined together by resistance welding.

As shown in FIGS. 4, 5(a) and 5(b), in the case of the present embodiment, at a position where the first return current path 31 and the second return current path 36 have the same path length, The positions of the first conductive member 71 and the second conductive member 72 with respect to the third conductive member 30 are set so that the branch portion 44 and the confluence portion 45 are arranged. Moreover, as described above, the thickness of the third conductive member 30 is substantially uniform over the entire third conductive member 30 .
As a result, the first return current path 31 and the second return current path 36 have the same path length and cross-sectional area. Through the path 42 , it can be evenly branched into the first return current path 31 and the second return current path 36 .

In the case of the present embodiment, as shown in FIGS. 5A and 5B in plan view, for example, the central portion of the third conductive member 30 in the horizontal direction has the first current path 42 and the second current path. It is arranged so as to overlap with the path 43 .
More specifically, a portion of the central portion in the left-right direction of the side portion on the front side of the third conductive member 30 is in surface contact with the upper surface of the end portion 42b (branch portion 44) of the first current path 42, for example. , a part of the central portion in the left-right direction of the side portion on the rear side of the third conductive member 30 overlaps with the end portion 42a of the first current path 42, for example. Further, a part of the central portion in the left-right direction of the lateral side portion on the rear side of the third conductive member 30 is, for example, in surface contact with the upper surface of the end portion 43a (joint portion 45) of the second current path 43. A portion of the central portion in the left-right direction of the side-shaped portion on the front side of the three-conductor member 30 overlaps the end portion 43 b of the second current path 43 , for example.
According to such a configuration, the magnetic flux loops can be evenly enhanced on both the right and left sides of the third conductive member 30 (both on the right and left sides of the first current path 42 and the second current path 43). , the inductance of the coil component 100 can be further improved.
As shown in FIG. 4, the front end surface of the third conductive member 30 is arranged substantially flush with the front end surface of the end portion 42b of the first current path 42, and the rear end surface of the third conductive member 30 It is arranged substantially flush with the rear end surface of the end portion 43 a of the second current path 43 .
In the case of the present embodiment, in the third conductive member 30 (ring conductive member), the right portion with respect to each of the branch portion 44 and the merging portion 45 constitutes the first return current path 31, and the left portion constitutes the second return current path 36 . Further, in the third conductive member 30, for example, the portion overlapping the branch portion 44 constitutes the first end portion 32 and the second end portion 37, and the portion overlapping the junction portion 45 constitutes the first end portion 32 and the second end portion 37. It constitutes the other end portion 33 and the second other end portion 38 .
However, the present invention is not limited to this example. may constitute the first return current path 31 .

Furthermore, in the case of this embodiment, as shown in FIGS. 5A and 5B, the first return current path 31 extends in parallel with the first current path 42 and the second current path 43. A first parallel extension 34 is provided. Similarly, the second return current path 36 includes a second parallel extension 39 extending in parallel with the first current path 42 and the second current path 43 .
As a result, the current flowing through each of the first parallel extension portion 34 and the second parallel extension portion 39 flows in the direction opposite to the current flowing through each of the first current path 42 and the second current path 43. . Therefore, a magnetic flux loop generated around each of the first parallel extension portion 34 and the second parallel extension portion 39 and a magnetic flux loop generated around each of the first current path 42 and the second current path 43 can be made to flow in directions that enhance each other's magnetic flux.
Here, “parallel” does not necessarily mean parallel. They may extend in intersecting directions. In this case, for example, the angle formed by each of the first parallel extension portion 34 and the second parallel extension portion 39 and the first current path 42 and the second current path 43 shall be less than 45 degrees. Further, each of the first parallel extension portion 34 and the second parallel extension portion 39 and the first current path 42 and the second current path 43 may be arranged on the same plane, or may be arranged on the same plane. may be related. When each of the first parallel extension portion 34 and the second parallel extension portion 39 and the first current path 42 and the second current path 43 are in a twisted relationship, when viewed from all directions, the first The maximum angle formed by each of the parallel extension portion 34 and the second parallel extension portion 39 and the first current path 42 and the second current path 43 is less than 45 degrees.

More specifically, as an example, the right side portion of the third conductive member 30 constitutes the first parallel extension portion 34, and the left side portion of the third conductive member 30 constitutes the second parallel extension portion. A part 39 is constructed. Therefore, each of the first parallel extension portion 34 and the second parallel extension portion 39 extends in the front-rear direction. While the current flowing through each of the first current path 42 and the second current path 43 flows from the rear toward the front (from the side of the first mounting terminal portion 51 to the side opposite to the side of the first mounting terminal portion 51), , the current flowing through each of the first parallel extension portion 34 and the second parallel extension portion 39 is directed from the front to the rear (from the side opposite to the first mounting terminal portion 51 side to the first mounting terminal portion 51 side). flow.
Further, the lateral width dimension of the first parallel extension portion 34 is set to, for example, substantially the same dimension as the lateral width dimension of the first current path 42, and the lateral width dimension of the second parallel extension portion 39 is The lateral width is set to be approximately equal to the lateral width of the first current path 42 .

In the case of the present embodiment, the current applied from the first mounting terminal portion 51 flows through the first current path 42 toward the branch portion 44 side (opposite side to the first mounting terminal portion 51). At the portion 44, it branches into the first return current path 31 and the second return current path 36 via the upper surface of the end portion 42b. The current branched to the first return current path 31 passes through the first end portion 32, the first parallel extension portion 34, and the first other end portion 33 in this order, and flows to the confluence portion 45 via the upper surface of the end portion 42b. . The current branched to the second return current path 36 passes through the second one end portion 37, the second return current path 36, and the second other end portion 38 in this order, and flows to the confluence portion 45 via the upper surface of the end portion 43a. In this way, the current branched to the first return current path 31 and the current branched to the second return current path 36 join together at the junction 45 . The merged current flows through the second current path 43 toward the end portion 43b (the second mounting terminal portion 55 side) of the second current path 43 opposite to the first mounting terminal portion 51 side.

Here, in the case of the present embodiment, the distance between the first current path 42 and the second current path 43 is defined as the first distance D1 (see FIG. 3), and the distance between the first current path 42 and the second current path 43 is the first distance D1. The distance between the first parallel extension portion 34 and the side located near the parallel extension portion 34 is defined as a second distance D2 (see FIG. 3). A third distance D3 (see FIG. 3) is defined as the distance between the second parallel extension portion 39 and the side located near the second parallel extension portion 39. As shown in FIG. Both the second distance D2 and the third distance D3 are greater than the first distance D1.
As a result, the distance (first distance D1) between the first current path 42 and the second current path 43 becomes smaller, so that the direction of the magnetic flux loop generated around the first current path 42 and the direction of the second current path 43 It is possible to prevent the directions of the magnetic flux loops generated in the surroundings from becoming directions in which the magnetic fluxes cancel each other out. Furthermore, since both the second distance D2 and the third distance D3 can be kept large, the magnetic flux loops generated around the first parallel extension portion 34 and the second parallel extension portion 39 and the The magnetic flux loops generated around each of the first current path 42 and the second current path 43 can enhance the magnetic fluxes of each other. Therefore, the inductance of coil component 100 can be further improved.
More specifically, in the case of the present embodiment, as shown in FIG. 3, the first current path 42 is arranged on the right side of the first current path 42 and the second current path 43, and the first parallel extension is arranged. The existing portion 34 is arranged on the right side of the first current path 42 . Therefore, the one of the first current path 42 and the second current path 43 that is closer to the first parallel extension portion 34 is the first current path 42 . Therefore, the direction in which the first current path 42 and the first parallel extension portion 34 are arranged is the left-right direction, and the second distance D2 is the distance between the first current path 42 and the first parallel extension portion 34 in the left-right direction. Distance.
Further, of the first current path 42 and the second current path 43, the second current path 43 is arranged on the left side, and the second return current path 36 is arranged on the left side of the second current path 43. . Therefore, the second current path 43 is the one of the first current path 42 and the second current path 43 that is closer to the second parallel extension portion 39 . Therefore, the direction in which the second current path 43 and the second parallel extension portion 39 are arranged is the left-right direction, and the third distance D3 is the distance between the second current path 43 and the second parallel extension portion 39 in the left-right direction. Distance.

The first distance D1 is preferably 20% or more and 200% or less of the dimension X shown in FIG. 3, for example.
The second distance D2 is preferably, for example, 20% or more and 200% or less of the dimension X shown in FIG.
The third distance D3 is preferably 20% or more and 200% or less of the dimension X shown in FIG. 3, for example.

[Second embodiment]
Next, a second embodiment will be described with reference to FIGS. 8 to 10. FIG.
The coil component 100 according to the present embodiment differs from the coil component 100 according to the first embodiment in the following points, and the coil component 100 according to the first embodiment in other points. is configured similarly. In addition, in FIG. 8, the core molded body 10 is indicated by a chain double-dashed line for the sake of convenience.

In the case of the present embodiment, as shown in FIGS. 8, 9A, and 9B, the coil component 100 includes the second conductive member 72 and the second conductive member as a conductive member other than the second conductive member 72. A third conductive member 30 having one return current path 31 and a fourth conductive member 80 having a second return current path 36 are provided.
Such a configuration can also improve the inductance.

More specifically, as shown in FIGS. 9(a) and 9(b), in a plan view, the third conductive member 30 is, for example, formed in a substantially semi-annular shape that protrudes toward the right. It includes a pair of front and rear facing portions, and a connecting portion that connects the pair of front and rear facing portions to each other. The left end portion of the front facing portion of the pair of front and rear facing portions constitutes the first one end portion 32 of the first return current path 31, and the rear facing portion of the pair of front and rear facing portions constitutes the first end portion 32 of the first return current path 31. The left end constitutes the first other end 33 of the first return current path 31 . Also, the connecting portion of the third conductive member 30 constitutes the first parallel extending portion 34 of the first return current path 31 .
The pair of front and rear facing portions extend in the left-right direction and face each other in parallel. The first parallel extending portion 34 extends in the front-rear direction. placed horizontally.
The lateral dimension of the rear facing portion is set, for example, to a dimension larger than the lateral dimension of the front facing portion, and the rear facing portion (left end) is the tip of the front facing portion (left side). end) to the left.

The fourth conductive member 80 is, for example, set to have the same shape and the same dimensions as those of the third conductive member 30, and is arranged in a posture that is reversed front to back and left to right. Therefore, like the third conductive member 30, the fourth conductive member 80 includes a pair of front and rear facing portions and a connecting portion. The right end of the front facing portion of the pair of front and rear facing portions constitutes the second one end portion 37 of the second return current path 36, and the right end of the rear facing portion of the pair of front and rear facing portions constitutes the second one end portion 37 of the second return current path 36. constitutes a second other end 38 of the second return current path 36 . A connecting portion of the fourth conductive member 80 constitutes the second parallel extending portion 39 of the second return current path 36 .
The lateral dimension of the front facing portion is set, for example, to be larger than the lateral dimension of the rear facing portion. The front end (right end) of the front facing portion protrudes further to the right than the front end (left end) of the rear facing portion.

As shown in FIGS. 8 and 10, the third conductive member 30 having the first return current path 31 is arranged below each of the first current path 42 and the second current path 43, for example. A fourth conductive member 80 having two return current paths 36 is arranged above each of the first current path 42 and the second current path 43, for example.
More specifically, in the case of the present embodiment, each of the entire top surface and the entire bottom surface of the end portion 42b (branch portion 44) of the first current path 42 is a non-insulating region.
As shown in FIGS. 9A, 9B, and 10, as an example, the upper surface of the first one end portion 32 of the first return current path 31 is the top surface of the end portion 42b of the first current path 42. The lower surface of the second one end portion 37 of the second return current path 36 is in surface contact with the upper surface of the end portion 42b. Thereby, each of the first return current path 31 and the second return current path 36 is electrically connected to the branch portion 44 and electrically connected to each other via the branch portion 44 .
Similarly, in the case of the present embodiment, each of the upper surface and the lower surface of the end portion 43a (the confluence portion 45) of the second current path 43 is an insulating film non-formation region.
As shown in FIGS. 9A, 9B, and 10, as an example, the upper surface of the first other end portion 33 of the first return current path 31 is the end portion 43a of the second current path 43. The lower surface of the second other end portion 38 of the second return current path 36 is in surface contact with the upper surface of the end portion 43a. Thereby, each of the first return current path 31 and the second return current path 36 is electrically connected to the junction portion 45 and electrically connected to each other via the junction portion 45 .

[Third Embodiment]
Next, a third embodiment will be described with reference to FIGS. 11 to 14(d).
The coil component 100 according to the present embodiment differs from the coil component 100 according to the first embodiment in the following points, and the coil component 100 according to the first embodiment in other points. is configured similarly.

In the case of this embodiment, the coil component 100 further has a third return current path 91 and a fourth return current path 96 branching off from the branch portion 44 .
The third return current path 91 has a third one end portion 92 at the branch portion 44 . The third return current path 91 extends from the third one end 92 toward the third other end 93 located near the end 43b of the first current path 42 on the first mounting terminal portion 51 side. The third other end portion 93 is electrically connected to the junction portion 45 .
Similarly, the fourth return current path 96 has a fourth one end 97 at the branch 44 . The fourth return current path 96 extends from the fourth one end 97 toward the fourth other end 98 located near the end 43b of the first current path 42 on the first mounting terminal portion 51 side. The fourth other end portion 98 is electrically connected to the junction portion 45 .
With such a configuration as well, the number of turns of the current path of coil component 100 can be sufficiently secured, so that the inductance of coil component 100 can be further improved.

In the case of this embodiment, the coil component 100 does not have the third conductive member 30 . Instead, the first conductive member 71 further has the first return current path 31 and the second return current path 36 in addition to the first current path 42 , the first outer surface arrangement portion 46 and the first mounting terminal portion 51 . In other words, the first current path 42, the first outer surface arrangement portion 46, the first mounting terminal portion 51, the first return current path 31, and the second return current path 36 are integrally formed with each other.
As a result, the number of members forming coil component 100 can be reduced, so that the ease of manufacturing coil component 100 can be improved.

In this embodiment, the first conductive member 71 is made of a copper plate, and the first current path 42, the first outer surface arrangement portion 46, and the first mounting terminal portion 51 are formed by bending the copper plate. ing.
Further, as shown in FIGS. 14A and 14B, the first conductive member 71 includes, for example, a first return current path in addition to a first portion 71a that constitutes the first current path 42. 31 and a third portion 71c forming the second return current path .
The second portion 71b and the third portion 71c are, for example, symmetrical to each other. More specifically, in a plan view, the second portion 71b is formed, for example, in a substantially semi-annular shape that protrudes leftward, and the third portion 71c is formed, for example, in a substantially half-ring shape that protrudes rightward. It is formed in an annular shape.
Each of the second portion 71b and the third portion 71c connects, for example, a pair of front and rear facing portions extending in the left and right direction, and the pair of front and rear facing portions, and extends in the front and rear direction. and a connection.

As shown in FIG. 14A, as an example, the left end portion of the front facing portion of the second portion 71b constitutes the first one end portion 32 of the first return current path 31, and the second portion 71b The left end portion of the facing portion on the rear side constitutes the first other end portion 33 of the first return current path 31, and the connecting portion of the second portion 71b is the first parallel portion of the first return current path 31. It constitutes an extension portion 34 . Similarly, as an example, the right end portion of the front facing portion of the third portion 71c constitutes the second one end portion 37 of the second return current path 36, and the rear facing portion of the third portion 71c. The right end portion constitutes the second other end portion 38 of the second return current path 36, and the connecting portion of the third portion 71c constitutes the second parallel extension portion 39 of the second return current path 36. ing.
The first one end 32 of the first return current path 31 (front facing portion of the second portion 71b) is directly connected to the right end of the end 42b of the first current path 42 (branch portion 44). A second one end portion 37 (a front facing portion of the third portion 71c) of the second return current path 36 is directly connected to the left end of the end portion 42b. On the other hand, the first other end portion 33 of the first return current path 31 (the facing portion on the rear side of the second portion 72b) is positioned relative to the right end of the end portion 42a of the first current path 42 on the first mounting terminal portion 51 side. , and the second other end 38 of the second return current path 36 (the rear facing portion of the third portion 72c) is slightly separated from the left end of the end 42a. .
As shown in FIG. 14B, the first current path 42 (first portion 71a), the first return current path 31 (second portion 71b), and the second return current path 36 (third portion 71c) are connected to each other. They are placed at approximately the same height. Further, the first current path 42, the first return current path 31, and the second return current path 36 are set to have approximately the same thickness.

Similarly, in the case of this embodiment, the second conductive member 72 includes the third return current path 91 and the fourth return current path 91 in addition to the second current path 43 , the second outer surface arrangement portion 47 and the second mounting terminal portion 55 . It also has a path 96 . In other words, the second current path 43, the second outer surface arrangement portion 47, the second mounting terminal portion 55, the third return current path 91 and the fourth return current path 96 are integrally formed with each other.
Similarly to the first conductive member 71, the second conductive member 72 is made of, for example, a copper plate. A mounting terminal portion 55 is formed.
As shown in FIGS. 14(c) and 14(d), the second conductive member 72 is, for example, set to have the same shape and the same size as the first conductive member 71, and is rotated in a front-back and left-right reversed posture. are placed.
More specifically, the second conductive member 72 includes, for example, a first portion 72a that forms the second current path 43, a second portion 72b that forms the third return current path 91, and a second portion 72b that forms the third return current path 91. and a third portion 72 c forming a return current path 96 . Similarly to the second portion 71b and the third portion 71c of the first conductive member 71, each of the second portion 72b and the third portion 72c includes a pair of front and rear facing portions extending in the left-right direction, a connecting portion connecting the pair of front and rear facing portions and extending in the front-rear direction.
As an example, the left end of the front facing portion of the second portion 72b constitutes the third one end 92 of the third return current path 91, and the left end of the rear facing portion of the second portion 72b constitutes the third other end portion 93 of the third return current path 91 , and the connecting portion of the second portion 72 b constitutes the third parallel extension portion 94 of the third return current path 91 . Similarly, as an example, the right end portion of the front facing portion of the third portion 72c constitutes a fourth one end portion 97 of the fourth return current path 96, and the rear facing portion of the third portion 72c. The right end constitutes a fourth other end 98 of the fourth return current path 96, and the connecting portion of the third portion 72c constitutes a fourth parallel extension 99 of the fourth return current path 96. ing.
The third other end portion 93 of the third return current path 91 (the facing portion on the rear side of the second portion 72b) is the end portion 43a of the second current path 43 on the side of the first mounting terminal portion 51 (the junction portion 45). The fourth other end 98 of the fourth return current path 96 (the rear facing portion of the third portion 72c) is directly connected to the left end of the end 43a. On the other hand, the third one end portion 92 of the third return current path 91 (the front-facing portion of the second portion 72b) is the right end of the end portion 43b of the second current path 43 opposite to the first mounting terminal portion 51 side. , and the fourth one end 97 of the fourth return current path 96 (front facing portion of the third portion 72c) is slightly separated from the right end of the end 43b. .
As shown in FIG. 14(d), the second current path 43, the third return current path 91, and the fourth return current path 96 are arranged at approximately the same height. Further, the second current path 43, the third return current path 91, and the fourth return current path 96 are set to have approximately the same thickness.
Further, in the case of the present embodiment, the lateral width dimension of the first current path 42 (the first portion 71a) is equivalent to the lateral width dimension of the first outer surface arrangement portion 46 and the lateral width dimension of the first mounting terminal portion 51, respectively. , and the lateral width of the second current path 43 (first portion 72a) is equivalent to the lateral width of the second outer surface arrangement portion 47 and the lateral width of the second mounting terminal portion 55. are set to the dimensions of

Here, the third return current path 91 includes, for example, a third parallel extension portion 94 extending in parallel with the first current path 42 and the second current path 43 .
Similarly, the fourth return current path 96 includes, for example, a fourth parallel extension 99 extending in parallel with the first current path 42 and the second current path 43 .
Thereby, a magnetic flux loop generated around each of the third parallel extension portion 94 and the fourth parallel extension portion 99 and a magnetic flux loop generated around each of the first current path 42 and the second current path 43 can be made to flow in directions that enhance each other's magnetic flux.
More specifically, as shown in FIGS. 13(a) and 13(b), the third parallel extension portion 94 is configured by, for example, a connecting portion of the second portion 72b of the second conductive member 72. , and the fourth parallel extending portion 99 are configured by, for example, the connecting portion of the third portion 72c of the second conductive member 72. As shown in FIG. Therefore, each of the third parallel extension portion 94 and the fourth parallel extension portion 99 extends in the front-rear direction and is arranged parallel to each other.
Here, “parallel” does not necessarily mean parallel. They may extend in intersecting directions. In this case, for example, the angle formed by each of the third parallel extension portion 94 and the fourth parallel extension portion 99 and the first current path 42 and the second current path 43 shall be less than 45 degrees. Further, each of the third parallel extension portion 94 and the fourth parallel extension portion 99 and the first current path 42 and the second current path 43 may be arranged on the same plane, or may be arranged on the same plane. may be related. When each of the third parallel extension portion 94 and the fourth parallel extension portion 99 and the first current path 42 and the second current path 43 are in a twisted relationship, when viewed from all directions, the third The maximum angle between each of the parallel extension portion 94 and the fourth parallel extension portion 99 and the first current path 42 and the second current path 43 is less than 45 degrees.

Also in the case of the present embodiment, similarly to the first and second embodiments, the thickness of each of the first conductive member 71 and the second conductive member 72 is, for example, substantially uniform over its entirety. In addition, they are formed to have the same thickness as each other. Therefore, the thickness dimensions of the first current path 42, the second current path 43, and the first return current path 31 to the fourth return current path 96 are set to be equal to each other.
However, as shown in FIG. 14(a), the horizontal width dimension of the first current path 42 is, for example, the width dimension of the first return current path 31 (dimension in the horizontal direction and the direction orthogonal to the extending direction). and the width dimension of the second return current path 36 (same as above). Similarly, as shown in FIG. 14B, the lateral width of the second current path 43 is, for example, the width of the third return current path 91 (the dimension in the horizontal direction and in the direction orthogonal to the extending direction). ) and the width of the fourth return current path 96 (same as above).
Thereby, the DC resistance of the current path of coil component 100 can be reduced.
Further, in the case of the present embodiment, as an example, the lateral width of each of the first return current path 31 to the fourth return current path 96 is the same as the lateral width of each of the first current path 42 and the second current path 43. It is set to about 1/2 size. That is, since there are four return current paths each having a cross-sectional area that is approximately half the cross-sectional area of each of the first current path 42 and the second current path 43, the cross-sectional area of the entire return current path is , twice the cross-sectional area of each of the first current path 42 and the second current path 43 . Therefore, the DC resistance in the current path of coil component 100 can be further reduced.

As shown in FIGS. 11 and 12, in the case of the present embodiment, the first conductive member 71 and the second conductive member 72 are vertically superimposed on each other.
More specifically, the second current path 43 is arranged, for example, on top of the first current path 42 . Therefore, in the case of this embodiment, the direction in which the first current path 42 and the second current path 43 are arranged is the vertical direction. The third return current path 91 is laid over the first return current path 31 , and the fourth return current path 96 is laid over the second return current path 36 .
Here, the entire upper surface 32a of the left end portion of the first end portion 32 and the entire upper surface 37a of the right end portion of the second end portion 37 are regions in which no insulating film is formed. Further, the entire lower surface 92a of the right end portion of the third one end portion 92 and the entire lower surface 97a of the left end portion of the fourth one end portion 97 are regions where no insulating film is formed. The upper surface 32a of the right end portion of the first one end portion 32 is in surface contact with the lower surface 92a of the right end portion of the third one end portion 92, and the upper surface 37a of the left end portion of the second one end portion 37 4 is in surface contact with the lower surface 97a of the left end portion of the one end portion 97. As shown in FIG.
Similarly, the entire top surface 33a of the right end portion of the first other end portion 33 and the entire top surface 38a of the left end portion of the second other end portion 38 are regions where no insulating film is formed. Further, the entire lower surface 93a of the right end portion of the third other end portion 93 and the entire lower surface 98a of the left end portion of the fourth other end portion 98 are regions where no insulating film is formed. The upper surface 33a of the right end portion of the first other end portion 33 is in surface contact with the lower surface 93a of the right end portion of the third other end portion 93, and the upper surface 38a of the left end portion of the second other end portion 38 is in surface contact. is in surface contact with the lower surface 98 a of the left end portion of the fourth other end portion 98 .
As a result, the first return current path 31 and the third return current path 91 (and thus the fourth return current path 96) are electrically connected to each other in the vicinity of the branch portion 44 and in the vicinity of each of the junction portions 45. The second return current path 36 and the fourth return current path 96 (and thus the third return current path 91) are electrically connected to each other.
In the case of the present embodiment, the first conductive member 71 and the second conductive member 72 may be joined via, for example, a conductive bonding agent, or may be joined together by resistance welding.

In the case of the present embodiment, part of the current that flows from the first mounting terminal portion 51 through the first current path 42 into the branch portion 44 flows into the upper surface 33 a of the first other end portion 33 and the third other end portion 93 . It branches into the first return current path 31 and the third return current path 91 through the lower surface 93a. The current branched to the first return current path 31 and the current branched to the third return current path 91 pass through the upper surface 33 a of the first other end portion 33 and the lower surface 93 a of the third other end portion 93 to the junction portion 45 . , and merge at the junction 45 .
Similarly, the rest of the current that has flowed from the first mounting terminal portion 51 through the first current path 42 into the branch portion 44 passes through the upper surface 37a of the second one end portion 37 and the lower surface 97a of the fourth one end portion 97. It branches into a second return current path 36 and a fourth return current path 96, respectively. The current branched to the second return current path 36 and the current branched to the fourth return current path 96 flow through the upper surface 38 a of the second other end 38 and the lower surface 98 a of the fourth other end 98 to the confluence portion 45 . , and merge at the junction 45 . Then, the current that has flowed into the confluence portion 45 flows through the second current path 43 and the second outer surface arrangement portion 47 in this order to the second mounting terminal portion 55 .

Here, the distance between the first current path 42 and the second current path 43 is defined as the first distance, and the one of the first current path 42 and the second current path 43 that is located near the third parallel extension portion 94 and , and the third parallel extension portion 94 is defined as a fourth distance, and the one of the first current path 42 and the second current path 43 located near the fourth parallel extension portion 99 and the fourth parallel extension portion 99 are defined as the fourth distance. The distance from the present portion 99 is defined as a fifth distance.
In this embodiment, both the fourth distance and the fifth distance are greater than the first distance, as shown in FIGS. 13(a) and 13(b).
As a result, both the fourth distance and the fifth distance can be kept large, so that the magnetic flux loop generated around each of the third parallel extension portion 94 and the fourth parallel extension portion 99 and the first current The magnetic flux loops generated around each of the path 42 and the second current path 43 can enhance the magnetic flux of each other. Therefore, the inductance of coil component 100 can be further improved.

More specifically, in the case of the present embodiment, the direction in which the first current path 42 and the second current path 43 are arranged is the vertical direction, and the entire first current path 42 and the entire second current path 43 are separated from each other. They overlap. Therefore, the distance (first distance) between the first current path 42 and the second current path 43 is substantially equal to zero. Therefore, it is more certain that the direction of the magnetic flux loop generated around the first current path 42 and the direction of the magnetic flux loop generated around the second current path 43 cancel each other out. can be suppressed to
In addition, in the case of the present embodiment, the first current path 42 is arranged on the right side of the first current path 42 and the second current path 43 , and the third parallel extension portion 94 is arranged on the first current path 42 is located on the right side of the Therefore, the one of the first current path 42 and the second current path 43 that is located near the third parallel extension portion 94 is the first current path 42 . Therefore, the direction in which the first current path 42 and the third parallel extension portion 94 are arranged is the left-right direction, and the third distance is the distance between the first current path 42 and the third parallel extension portion 94 in the left-right direction. is.
Further, of the first current path 42 and the second current path 43, the second current path 43 is arranged on the left side, and the second return current path 36 is arranged on the left side of the second current path 43. . Therefore, the second current path 43 is the one of the first current path 42 and the second current path 43 that is closer to the fourth parallel extension portion 99 . Therefore, the direction in which the second current path 43 and the fourth parallel extension portion 99 are arranged is the left-right direction, and the fourth distance is the separation distance between the second current path 43 and the fourth parallel extension portion 99 in the left-right direction. is.

Furthermore, as shown in FIGS. 13A and 13B, in the case of this embodiment, the entire first return current path 31 and the entire third return current path 91 overlap each other.
More specifically, the entire first parallel extension portion 34 and the entire third parallel extension portion 94 overlap each other. Further, as described above, the first parallel extension portion 34 and the third parallel extension portion 94 each extend in the front-rear direction. That is, the extending direction of the first parallel extending portion 34 and the extending direction of the third parallel extending portion 94 are the same direction, and the first parallel extending portion 34 and the third parallel extending portion 94 extend parallel to each other. Also, the direction in which the first parallel extension portion 34 and the third parallel extension portion 94 are arranged is the vertical direction, and the distance between the first parallel extension portion 34 and the third parallel extension portion 94 is, for example, The value is substantially equal to 0. The current flowing through the first parallel extension portion 34 and the current flowing through the third parallel extension portion 94 are configured to flow in the same direction. Therefore, a large magnetic flux loop is formed around the first return current path 31 and the third return current path 91 .
Similarly, the entire second return current path 36 and the entire fourth return current path 96 overlap each other.
More specifically, the second parallel extension portion 39 and the fourth parallel extension portion 99 extend parallel to each other, and the second parallel extension portion 39 and the fourth parallel extension portion 99 are aligned in the vertical direction, and the distance between the second parallel extension portion 39 and the fourth parallel extension portion 99 is substantially equal to zero, for example. The current flowing through the second parallel extension portion 39 and the current flowing through the fourth parallel extension portion 99 are configured to flow in the same direction. Therefore, a large magnetic flux loop is formed around the second parallel extension portion 39 and the fourth parallel extension portion 99 .
Thus, the inductance of the coil component 100 can be improved also by this embodiment.

In this embodiment, the combination of the first return current path 31 and the second return current path 36 and the combination of the third return current path 91 and the fourth return current path 96 are limited to the above examples. For example, any two of the second portion 71b and the third portion 71c of the first conductive member 71 and the second portion 72b and the third portion 72c of the second conductive member 72 are connected to the first return current path 31. and a second return current path 36 . The remaining arbitrary two of the second portion 71 b to the third portion 72 c can be used as the third return current path 91 and the fourth return current path 96 .
In the above description, the coil component 100 has four return current paths, ie, the first return current path 31 to the third return current path 91. However, the present invention is not limited to this example, The number of return current paths provided in the coil component 100 may be two or three, for example.

[Fourth Embodiment]
Next, a fourth embodiment will be described with reference to FIGS. 15 and 16. FIG.
The coil component 100 according to the present embodiment differs from the coil component 100 according to the first to third embodiments in the following points, and in other respects, it is different from the first to third embodiments. It is configured in the same manner as the coil component 100 concerned.

In this embodiment, the core molded body 10 includes a first molded body 11 and a second molded body 21 that are combined with each other.
15 and 16, between the first molded body 11 and the second molded body 21, a first current path 42, a second current path 43, a first return current path 31, and a second A return current path 36 is arranged.
With such a configuration, the core molded body 10 is divided into two, so that the structural strength of each core molded body (the first molded body 11 and the second molded body 21) can be improved. can be done. Therefore, for example, even if ferrite or a metallic magnetic material is used as the material constituting the core molded body 10, the structural strength of each core molded body (first molded body 11 and second molded body 21) is sufficiently increased. can be secured. Therefore, the manufacturing cost of coil component 100 can be reduced. Also, the ease of manufacturing the coil component 100 can be improved.

More specifically, as shown in FIG. 16, the core molded body 10 is formed by, for example, stacking and assembling two upper and lower members, that is, a first molded body 11 on the lower side and a second molded body 21 on the upper side. It is composed of
The first molded body 11 is formed in a flat rectangular parallelepiped shape whose vertical dimension is smaller than each of its lateral dimension and longitudinal dimension.
The first molded body 11 has a front surface 12 facing forward, a rear surface 13 facing rearward, a pair of left and right side surfaces 14 facing left and right respectively, and an upper surface 15 facing upward. , and a downwardly facing lower surface 16 .
The second molded body 21 is formed in a flat plate shape with a plate surface facing in the up-down direction, and is formed in a substantially rectangular shape in a plan view.
The second molded body 21 has a front end face 22 facing forward, a rear end face 23 facing rearward, a pair of left and right side end faces 24 facing left and right, respectively, and an upward face. It has a top surface 25 and a bottom surface 26 facing downward.

Each of the first molded body 11 and the second molded body 21 is integrally molded with a magnetic material such as ferrite. However, each of the first molded body 11 and the second molded body 21 may be made of, for example, a metallic magnetic material.
In the case of this embodiment, the lateral width dimension of the first molded body 11 is slightly smaller than the lateral width dimension of the second molded body 21 , and the front-to-rear width dimension of the first molded body 11 is equal to that of the second molded body 21 . slightly smaller than the width dimension. Also, the vertical dimension of the first molded body 11 is larger than the vertical dimension of the second molded body 21, for example.

Here, as shown in FIG. 16, a groove portion 18a is formed in the surface of the first molded body 11 on the second molded body 21 side.
More specifically, the upper surface 15 of the first molded body 11 has a groove 18a recessed downward, the front surface 12 has a recess 19b recessed inward (rearward), and the back surface 13 has an inward (rearward) recess 19b. A recessed portion 19b that is recessed rearward and a second groove portion 18b that is recessed upward are formed in the lower surface 16, respectively.
The groove portion 18 a is formed from the front end to the rear end of the upper surface 15 of the first molded body 11 . The groove portion 18a extends linearly in the front-rear direction and is recessed downward. The groove portion 18a is formed to have a uniform depth as a whole, and the bottom surface of the groove portion 18a is flat and horizontal as a whole.
The second groove portion 18 b is formed, for example, from the front end to the rear end of the lower surface 16 of the first molded body 11 . The second groove portion 18b extends linearly in the front-rear direction and is recessed upward.
Each of the groove portion 18a and the second groove portion 18b is arranged at the same position as each other in the left-right direction, for example. More specifically, as an example, the groove portion 18a is arranged in the center portion in the left-right direction of the upper surface 15 of the first molded body 11, and the second groove portion 18b is arranged in the left-right direction of the lower surface 16 of the first molded body 11. placed in the center.
The depths (dimensions in the front-rear direction) of the recesses 19a and 19b are uniform as a whole. Therefore, the bottom surface of the front concave portion 19a is perpendicular to the Y direction and is a vertical surface facing forward, and the bottom surface of the rear concave portion 19b is perpendicular to the Y direction and is rearward. It is a vertical plane facing the
The front concave portion 19a is formed from the front edge of the groove portion 18a to the front edge of the second groove portion 18b. Similarly, the rear concave portion 19b is formed from the rear edge of the groove portion 18a to the rear edge of the second groove portion 18b.
Each recess 19a, 19b is formed in a substantially rectangular shape when viewed from the front (or viewed from the back).

Further, as shown in FIG. 16 , on the surface of the second molded body 21 on the side of the first molded body 11 , a convex portion 28 that protrudes toward the first molded body 11 side is formed.
More specifically, the convex portion 28 protrudes downward from the lower surface 26 of the second molded body 21, for example. For example, the convex portion 28 is formed in a substantially rectangular shape with rounded corners in a plan view. The lower surface of the convex portion 28 and the bottom surface of the groove portion 18a are generally flat and horizontal.
The convex portion 28 is, for example, one size smaller than the second molded body 21 and arranged in the center of the lower surface 26 of the second molded body 21 . The vertical dimension of the convex portion 28 is set smaller than the vertical dimension of the second molded body 21, for example.

In the case of this embodiment, the first conductive member 71 and the second conductive member 72 are set to have the same shape and dimensions as those of the first and second embodiments, respectively. The first conductive member 71 has a first current path 42 (first portion 72 a ), a first outer surface arrangement portion 46 , and a first mounting terminal portion 51 . Similarly, the second conductive member 72 has a second current path 43 (first portion 72 a ), a second outer surface arrangement portion 47 , and a second mounting terminal portion 55 .
Also, the third conductive member 30 is, for example, a conductive ring member as in the first embodiment. Therefore, the third conductive member 30 (conductive ring member) has a pair of front and rear side portions, a pair of left and right side portions, and a gap portion 30a.

Here, in the case of this embodiment, the first current path 42 and the second current path 43 are arranged in the groove portion 18a.
More specifically, the first portion 71a (first current path 42) of the first conductive member 71 and the first portion 72a (second current path 43) of the second conductive member 72 are accommodated in the groove portion 18a. It is arranged horizontally along the bottom surface of the groove portion 18a.
The first outer surface arrangement portion 46 of the first conductive member 71 is arranged vertically along the bottom surface of the front recess 19b. Preferably, the entire first outer surface arrangement portion 46 is accommodated in the front recess 19b. It is The first mounting terminal portion 51 of the first conductive member 71 is arranged horizontally along the bottom surface of the second groove portion 18b.
The second outer surface arrangement portion 47 of the second conductive member 72 is arranged vertically along the bottom surface 31a of the rear recess 19b. Contained. The second mounting terminal portion 55 of the second conductive member 72 is arranged horizontally along the bottom surface of the second groove portion 18b.

In the case of the present embodiment, the lateral width dimension of the groove portion 18a is, for example, substantially equal to or slightly larger than the total value of the lateral width dimension of the first current path 42 and the lateral width dimension of the second current path 43. is set to Similarly, the lateral width dimension of the second groove portion 18b is, for example, substantially equal to or slightly larger than the total value of the lateral width dimension of the first current path 42 and the lateral width dimension of the second current path 43. is set.
Further, the lateral width of each of the recesses 19a and 19b is set to be substantially equal to or larger than the lateral width of each of the first outer surface arrangement portion 46 and the second outer surface arrangement portion 47, for example. .

Furthermore, in the case of this embodiment, as shown in FIG. 15, the convex portion 28 is inserted into the central space portion 30a of the conductive ring member (the third conductive member 30).
Thereby, the second molded body 21 and the third conductive member 30 can be easily assembled to each other.
More specifically, in a plan view, the outer shape of the convex portion is set to have substantially the same shape and dimensions as the shape of the outer circumference of the gap 30a of the conductive ring member (the shape of the inner circumference of the conductive ring member), for example. there is Therefore, the convex portion 28 fits well into the conductive ring member. Further, the lower surface of the convex portion 28 is in surface contact with the upper surface 15 of the first molded body 11, for example.

As shown in FIGS. 15 and 16, the first molded body 11 and the second molded body 21 are separated by, for example, a first current path 42, a second current path 43 and a third conductive member 30 (conductive ring member). are fixed to each other in a state of being sandwiched between
The method of fixing the first molded body 11 and the second molded body 21 to each other is not particularly limited. Either one or both of an adhesive tape (not shown) and an adhesive (not shown) may be interposed between the surface on the 11 side and fixed (surface bonding), or the first The molded body 11 and the second molded body 21 may be fixed by winding a fixing tape (not shown) around their respective outer peripheries.

Although each embodiment has been described with reference to the drawings, these are examples of the present invention, and include various modifications and improvements as long as the object of the present invention is achieved.

For example, in the above description, an example in which the first mounting terminal portion 51 and the first current path 42 are each formed by a part of one member (the first conductive member 71) has been described. However, the first mounting terminal portion 51 may be configured by a member separate from the first current path 42 and may be electrically (and mechanically) connected to the first current path 42 indirectly or directly. . Similarly, in the above description, an example in which the second mounting terminal portion 55 and the second current path 43 are each composed of a part of one member (the second conductive member 72) has been described. The second mounting terminal portion 55 is configured by a member different from the second current path 43 and is electrically (and mechanically) connected to the second current path 43 indirectly or directly, without being limited to the example. good too.

In the above description, an example was described in which current flows from the first mounting terminal portion 51 to the second mounting terminal portion 55 through the first current path 42 and the second current path 43, but the present invention is limited to this example. Instead, for example, the current may be configured to be applied to the second mounting terminal portion 55 and flow toward the first mounting terminal portion 51 .

Further, in the fourth embodiment, the groove portion 18a for accommodating the first current path 42 and the second current path 43 is selectively formed in the first molded body 11 between the first molded body 11 and the second molded body 21. However, the groove 18a may be formed on the lower surface 26 of the second molded body 21, or may be formed on both the upper surface 15 of the first molded body 11 and the lower surface 26 of the second molded body 21. may be formed.

Further, for example, in the above description, an example in which the coil component 100 includes both the first return current path 31 and the second return current path 36 has been described, but the present invention is not limited to this example, and FIG. 21, the number of return current paths provided in the coil component 100 may be one.
That is, the present invention includes a core molded body 10 made of a magnetic material, a first mounting terminal portion 51, a first current path 42 connected to the first mounting terminal portion 51, and a second mounting terminal portion. 55, a second current path 43 connected to the second mounting terminal portion 55 and extending in parallel with the first current path 42, and the first mounting terminal portion 51 in the first current path 42. and a return current path 110 connecting the end 42b on the side opposite to the side and the end 43a of the second current path 43 on the side of the first mounting terminal portion to each other. .
With such a configuration as well, it is possible to realize the coil component 100 having a structure capable of improving the inductance.
In this case, the return current path 110 includes a parallel extension portion 112 extending in parallel with the first current path 42 and the second current path 43, and the first current path 42 and the second current path 43 Assuming that the distance between Preferably, the second distance is greater than the first distance.
By doing so, on the other hand, a larger second distance can be ensured, so that the magnetic flux loop generated around the parallel extending portion 112 and each of the first current path 42 and the second current path 43 A magnetic flux loop generated in the surroundings can enhance the magnetic flux with each other. Therefore, the inductance of coil component 100 can be further improved.

When the number of return current paths provided in the coil component 100 is one, as shown in FIGS. is formed in a semi-annular shape. As an example, the third conductive member 30 is arranged horizontally, and one end of the substantially semi-annular third conductive member 30 is on the upper surface of the end 42b (branch portion 44) of the first current path 42. The other end portion of the third conductive member 30 is arranged on the upper surface of the end portion 43 a (joint portion 45 ) of the second current path 43 .
Alternatively, as shown in FIGS. 19 to 21, the third conductive member 30 is, for example, substantially semi-annular in side view. As an example, the third conductive member 30 is arranged vertically. In this case, as shown in FIG. 21, the first current path 42 is, for example, bent so that the end portion 42b (branch portion 44) is in an upright state, and the second current path 43 is bent upward. For example, the end portion 43a (merging portion 45) is bent so as to stand upward. One end of the substantially semi-annular third conductive member 30 is in surface contact with the front surface of the end 42a of the first current path 42, and the other end of the third conductive member 30 is in contact with the second current path. 43 is in surface contact with the rear surface of the end 43a. Further, as shown in FIGS. 20A and 20B, the third conductive member 30 has, for example, an inclined shape so as to be displaced rightward from the branch portion 44 toward the confluence portion 45 in plan view. It has become.

This embodiment includes the following technical ideas.
(1) a core molded body made of a magnetic material;
a first mounting terminal portion;
a first current path connected to the first mounting terminal;
a second mounting terminal portion;
a second current path connected to the second mounting terminal portion and extending in parallel to the first current path;
a first return current path and a second return current path branching off from a branch portion that is an end portion of the first current path opposite to the first mounting terminal portion;
has
The first return current path has a first one end portion at the branch portion, and a first return current path located near an end portion of the first current path on the first mounting terminal side from the first one end portion. extends toward the end, and is electrically connected at the first other end to a confluence portion that is the end of the second current path on the first mounting terminal side,
The second return current path has a second one end portion at the branch portion, and a second return current path located in the vicinity of the first mounting terminal portion side end portion of the first current path from the second one end portion. A coil component extending toward an end and electrically connected to the junction at the second other end.
(2) the first return current path includes a first parallel extension extending in parallel with the first current path and the second current path;
the second return current path includes a second parallel extension extending in parallel with the first current path and the second current path;
A distance between the first current path and the second current path is defined as a first distance,
A distance between the first parallel extension portion and the first parallel extension portion of the first current path and the second current path is defined as a second distance,
If the distance between the first current path and the second current path located near the second parallel extension portion and the second parallel extension portion is defined as a third distance,
The coil component according to (1), wherein both the second distance and the third distance are greater than the first distance.
(3) The coil component according to (1) or (2), wherein the first current path and the second current path are adjacent to each other via an insulating film.
(4) a first conductive member having the first mounting terminal portion and the first current path;
a second conductive member having the second mounting terminal portion and the second current path;
The coil component according to any one of (1) to (3), comprising:
(5) The coil component according to (4), wherein the first return current path and the second return current path are configured by a conductive member different from the first conductive member and the second conductive member.
(6) The coil component according to (5), which includes a third conductive member having the first return current path and the second return current path as the another conductive member.
(7) The coil component according to (6), wherein the third conductive member is a conductive ring member formed in a ring shape.
(8) the first current path and the second current path are arranged side by side;
The coil component according to (7), wherein the conductive ring member is overlaid on the first current path and the second current path.
(9) The coil component according to (5), further comprising, as the separate conductive members, a third conductive member having the first return current path and a fourth conductive member having the second return current path.
(10) The coil component according to any one of (4) to (9), wherein each of the first conductive member and the second conductive member is made of a rectangular wire.
(11) further comprising a third return current path and a fourth return current path branching off from the branching portion;
The third return current path has a third one end portion at the branch portion, and a third return current path located near the first mounting terminal side end portion of the first current path from the third one end portion. extends toward the end, and is electrically connected to the junction at the third other end,
The fourth return current path has a fourth one end portion at the branch portion, and a fourth return current path located in the vicinity of the first mounting terminal portion side end portion of the first current path from the fourth one end portion. The coil component according to any one of (1) to (4), which extends toward an end portion and is electrically connected to the confluence portion at the fourth other end portion.
(12) the third return current path includes a third parallel extension extending in parallel with the first current path and the second current path;
the fourth return current path includes a fourth parallel extension extending in parallel with the first current path and the second current path;
A distance between the first current path and the second current path is defined as a first distance,
setting a distance between the first current path and the second current path located near the third parallel extension portion and the third parallel extension portion as a fourth distance;
If the distance between the first current path and the second current path located near the fourth parallel extension portion and the fourth parallel extension portion is a fifth distance,
The coil component according to (11), wherein both the fourth distance and the fifth distance are greater than the first distance.
(13) the core molded body is a composite magnetic body formed by compression molding a material containing a metal magnetic powder and a thermosetting resin;
The coil component according to any one of (1) to (12), including the first current path, the second current path, the first return current path, and the second return current path.
(14) the core molded body includes a first molded body and a second molded body that are combined with each other;
The first current path, the second current path, the first return current path, and the second return current path are arranged between the first molded body and the second molded body (1) The coil component according to any one of (12) to (12).
(15) the core molded body includes a first molded body and a second molded body that are combined with each other;
The first current path, the second current path, the first return current path, and the second return current path are arranged between the first molded body and the second molded body,
A convex portion is formed on a surface of the second molded body on the side of the first molded body toward the side of the first molded body,
The coil component according to (7) or (8), wherein the protrusion is inserted into the center gap of the conductive ring member.
(16) A groove is formed in the surface of the first molded body on the side of the second molded body, and the first current path and the second current path are arranged in the groove (14) or (15) ).
<1> a core molded body made of a magnetic material;
a first mounting terminal portion;
a first current path connected to the first mounting terminal;
a second mounting terminal portion;
a second current path connected to the second mounting terminal portion and extending in parallel to the first current path;
a return current path interconnecting an end of the first current path opposite to the first mounting terminal side and an end of the second current path on the first mounting terminal side; ,
Coil components with
<2> the return current path includes a parallel extending portion extending in parallel with the first current path and the second current path;
A distance between the first current path and the second current path is defined as a first distance,
If the distance between the first current path and the second current path located near the parallel extension portion and the parallel extension portion is defined as a second distance,
The coil component according to <1>, wherein the second distance is greater than the first distance.

10 Core Molded Body 11 First Core Molded Body 12 Front Surface 13 Back Surface 14 Side Surface 15 Upper Surface 16 Bottom Surface 17 Recess 18a Groove 18b Second Grooves 19a, 19b Recess 21 Second Core Molded Body 22 Front Surface 23 Back Surface 24 Side Surface 25 Top Surface 26 Bottom Surface 28 Projection 30 Third conductive member 31 First return current path 32 First one end 33 First other end 34 First parallel extension 36 Second return current path 37 Second one end 38 Second other end 39 Two parallel extending portions 42 First current paths 42a, 42b Ends 43 Second current paths 43a, 42b Ends 44 Branching portion 45 Merging portion 46 First outer surface placement portion 47 Second outer surface placement portion 51 First mounting terminal portion 55 Second mounting terminal portion 71 First conductive member 71a First portion 71b Second portion 71c Third portion 72 Second conductive member 72a First portion 72b Second portion 72c Third portion 80 Fourth conductive member 91 Third return current path 92 Third one end 93 Third other end 94 Third parallel extension 96 Fourth return current path 97 Fourth one end 98 Fourth other end 99 Fourth parallel extension 100 Coil component

Claims (16)

a core molded body made of a magnetic material;
a first mounting terminal portion;
a first current path connected to the first mounting terminal;
a second mounting terminal portion;
a second current path connected to the second mounting terminal portion and extending in parallel to the first current path;
a first return current path and a second return current path branching off from a branch portion that is an end portion of the first current path opposite to the first mounting terminal portion;
has
The first return current path has a first one end portion at the branch portion, and a first return current path located near an end portion of the first current path on the first mounting terminal side from the first one end portion. extends toward the end, and is electrically connected at the first other end to a confluence portion that is the end of the second current path on the first mounting terminal side,
The second return current path has a second one end portion at the branch portion, and a second return current path located in the vicinity of the first mounting terminal portion side end portion of the first current path from the second one end portion. A coil component extending toward an end and electrically connected to the junction at the second other end. the first return current path includes a first parallel extension extending in parallel with the first current path and the second current path;
the second return current path includes a second parallel extension extending in parallel with the first current path and the second current path;
A distance between the first current path and the second current path is defined as a first distance,
A second distance is defined as a distance between the first parallel extension portion and the one of the first current path and the second current path located near the first parallel extension portion,
When the distance between the first current path and the second current path located near the second parallel extension portion and the second parallel extension portion is defined as a third distance,
2. The coil component according to claim 1, wherein both said second distance and said third distance are greater than said first distance. 3. The coil component according to claim 1, wherein said first current path and said second current path are adjacent to each other via an insulating film. a first conductive member having the first mounting terminal portion and the first current path;
a second conductive member having the second mounting terminal portion and the second current path;
The coil component according to any one of claims 1 to 3, comprising: 5. The coil component according to claim 4, wherein said first return current path and said second return current path are configured by a conductive member different from said first conductive member and said second conductive member. 6. The coil component according to claim 5, further comprising a third conductive member having said first return current path and said second return current path as said another conductive member. 7. The coil component according to claim 6, wherein said third conductive member is a conductive ring member formed in a ring shape. the first current path and the second current path are arranged side by side;
8. The coil component according to claim 7, wherein said conductive ring member is disposed over said first current path and said second current path. 6. The coil component according to claim 5, comprising a third conductive member having said first return current path and a fourth conductive member having said second return current path as said another conductive member. 10. The coil component according to any one of claims 4 to 9, wherein each of said first conductive member and said second conductive member is composed of a rectangular wire. further comprising a third return current path and a fourth return current path branching off from the branching portion;
The third return current path has a third one end portion at the branch portion, and a third return current path located near the first mounting terminal side end portion of the first current path from the third one end portion. extends toward the end, and is electrically connected to the junction at the third other end,
The fourth return current path has a fourth one end portion at the branch portion, and a fourth return current path located in the vicinity of the first mounting terminal portion side end portion of the first current path from the fourth one end portion. 5. The coil component according to any one of claims 1 to 4, extending toward an end portion and electrically connected to the confluence portion at the fourth other end portion. the third return current path includes a third parallel extension extending in parallel with the first current path and the second current path;
the fourth return current path includes a fourth parallel extension extending in parallel with the first current path and the second current path;
A distance between the first current path and the second current path is defined as a first distance,
setting a distance between the first current path and the second current path located near the third parallel extension portion and the third parallel extension portion as a fourth distance;
If the distance between the first current path and the second current path located near the fourth parallel extension portion and the fourth parallel extension portion is a fifth distance,
12. The coil component according to claim 11, wherein both said fourth distance and said fifth distance are greater than said first distance. The core molded body is a composite magnetic body formed by compression molding a material containing metal magnetic powder and thermosetting resin,
The coil component according to any one of claims 1 to 12, including the first current path, the second current path, the first return current path, and the second return current path. The core molded body includes a first molded body and a second molded body that are combined with each other,
2. The first current path, the second current path, the first return current path, and the second return current path are arranged between the first molded body and the second molded body. 13. The coil component according to any one of 12. The core molded body includes a first molded body and a second molded body that are combined with each other,
The first current path, the second current path, the first return current path, and the second return current path are arranged between the first molded body and the second molded body,
A convex portion is formed on a surface of the second molded body on the side of the first molded body toward the side of the first molded body,
9. The coil component according to claim 7, wherein the convex portion is inserted into the center gap of the conductive ring member. 16. The coil according to claim 14 or 15, wherein a groove is formed in the surface of the first molded body on the side of the second molded body, and the first current path and the second current path are arranged in the groove. parts.

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