JP2024078967A - Coil parts - Google Patents

Abstract

[Problem] To enhance magnetic coupling between coil conductors in a coil component. [Solution] A coil component according to one embodiment includes a base body made of an insulating material and having a first surface and a second surface opposite the first surface, a first coil conductor, and a second coil conductor. The first coil conductor is provided within the base body so as to face the first surface. The second coil conductor is provided within the base body so as to face the second surface. The first coil conductor has a first winding portion wound around a coil axis, a first one-end lead portion extending from one end of the first winding portion to the second surface, and a first other-end lead portion extending from the other end of the first winding portion to the second surface. The second coil conductor has a second winding portion wound around the coil axis, a second one-end lead portion extending from one end of the second winding portion to the second surface, and a second other-end lead portion extending from the other end of the second winding portion to the second surface. A first distance indicating a distance between the first winding portion and the first surface is greater than a second distance indicating a distance between the second winding portion and the second surface.

Description

The disclosure of this specification relates primarily to coil components. More specifically, the disclosure of this specification relates to coil components suitable for high-frequency circuits. The disclosure of this specification also relates to an array-type coil component having multiple coils.

A magnetically coupled coil component having two or more coil conductors that are magnetically coupled to each other is known as one type of coil component. As described in JP 2016-131208 A (Patent Document 1), a magnetically coupled coil component has two or more coil conductors that are electrically insulated from each other and magnetically coupled to each other within a base body. Magnetically coupled coil components are used in circuits, for example, as common mode choke coils, transformers, or coupled inductors.

Each of the coil conductors constituting the magnetically coupled coil component has a winding portion that extends in the circumferential direction around the coil axis, and a lead-out portion that connects each of the two ends of the winding portion to a corresponding external electrode. The winding portion of the coil component provided in the conventional magnetically coupled coil component has a relatively large number of turns. For example, in the magnetically coupled coil component of Patent Document 1, the winding portion of each coil conductor is wound with five or more turns.

JP2016-131208A

In magnetically coupled coil components, it is generally desirable for the coupling between the coil conductors to be high. For this reason, there have been proposals for increasing the coupling coefficient of magnetically coupled coil components. For example, in the above-mentioned Patent Document 1, a high coupling coefficient is achieved by arranging a pair of coil conductors embedded in a magnetic base so that their winding axes are approximately aligned and in close contact with each other.

Magnetically coupled coil components used in high-frequency circuits use coil conductors with a winding portion with a small number of turns (e.g., less than two turns). Until now, sufficient consideration has not been given to the coupling between coil conductors with winding portions with a small number of turns.

The object of the invention disclosed in this specification is to solve or alleviate at least some of the above-mentioned problems. One of the more specific objects of the invention disclosed in this specification is to increase the magnetic coupling between coil conductors in a coil component. One of the more specific objects of the present invention is to increase the magnetic coupling between coil conductors in a coil component having a coil conductor with a winding portion with a small number of turns.

Objects of the present invention other than those mentioned above will become clear throughout the entire specification. The invention disclosed in this specification may solve problems that are understood from other than those described in the "Problems to be Solved by the Invention" section.

The coil component according to one embodiment is made of an insulating material and includes a base having a first surface and a second surface opposite the first surface, a first coil conductor, and a second coil conductor. The first coil conductor is provided within the base so as to face the first surface. The second coil conductor is provided within the base so as to face the second surface. The first coil conductor has a first winding portion wound around the coil axis, a first one-end lead portion extending from one end of the first winding portion to the second surface, and a first other-end lead portion extending from the other end of the first winding portion to the second surface. The second coil conductor has a second winding portion wound around the coil axis, a second one-end lead portion extending from one end of the second winding portion to the second surface, and a second other-end lead portion extending from the other end of the second winding portion to the second surface. The first distance indicating the distance between the first winding portion and the first surface is greater than the second distance indicating the distance between the second winding portion and the second surface.

According to one embodiment of the invention disclosed in this specification, the magnetic coupling between coil conductors in a coil component can be increased.

1 is a perspective view showing a magnetically coupled coil component according to a first embodiment; 2 is a cross-sectional view that illustrates a schematic cross section of the magnetically coupled coil component of FIG. 1 taken along line II. 3 is a plan view showing a conductor pattern provided on the magnetic film 11a of FIG. 2. 3 is a plan view showing a conductor pattern provided on the magnetic film 11b of FIG. 2. 3 is a plan view showing a conductor pattern provided on the magnetic film 11c of FIG. 2. 3 is a plan view showing a conductor pattern provided on the magnetic film 11d of FIG. 2. 2 is a transparent view of the magnetically coupled coil component of FIG. 1 as viewed from above. 2 is a perspective view of the magnetically coupled coil component of FIG. 1 as viewed from below. FIG. 11 is a transparent view of a magnetically coupled coil component according to a second embodiment, as viewed from above. 7 is a perspective view of the magnetically coupled coil component of FIG. 6 as viewed from below. FIG. 11 is a cross-sectional view of a magnetically coupled coil component according to a third embodiment. FIG. 13 is a perspective view showing an array-type coil component according to a fourth embodiment. 10 is a transparent view of the array-type coil component of FIG. 9 as viewed from above. FIG. 13 is a transparent view of an array-type component according to a fifth embodiment, seen from above.

Various embodiments of the present invention will be described below with reference to the drawings as appropriate. Components common to multiple drawings are given the same reference numerals throughout the multiple drawings. Please note that the drawings are not necessarily drawn to scale for ease of explanation. The embodiments described below do not necessarily limit the invention according to the claims. The elements described in the following embodiments are not necessarily essential to the solution of the invention.

1 First embodiment 1-1 Basic structure of a magnetically coupled coil component The basic structure of a magnetically coupled coil component 1 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a perspective view of the magnetically coupled coil component 1 according to the first embodiment.

The magnetically coupled coil component 1 can be used as a choke coil for a DC-DC converter. In addition to being used as a choke coil for a DC-DC converter, the magnetically coupled coil component 1 can also be used in transformers, coupled inductors, and various other magnetically coupled coil components.

The magnetically coupled coil component 1 includes a plurality of coil conductors that are magnetically coupled to each other. In the illustrated example, the magnetically coupled coil component 1 includes two coil conductors. More specifically, the magnetically coupled coil component 1 shown in FIG. 1 includes a base 10, a first coil conductor 25 provided on the base 10, a second coil conductor 35 provided on the base 10, a first external electrode 21 connected to one end of the first coil conductor, a second external electrode 22 connected to the other end of the first coil conductor, a third external electrode 23 connected to one end of the second coil conductor, and a fourth external electrode 24 connected to the other end of the second coil conductor. The first coil conductor 25 and the second coil conductor 35 are magnetically coupled.

The magnetically coupled coil component 1 can be mounted on a mounting board 2a. The mounting board 2a is provided with land portions 3a and 3b. The coil component 1 is mounted on the mounting board 2a by joining the first external electrode 21, the second external electrode 22, the third external electrode 23, and the fourth external electrode 24 to the land portions 3a, 3b, 3c, and 3d, respectively. The circuit board 2 can include the coil component 1 and a mounting board 2a on which the coil component 1 is mounted. The circuit board 2 can be mounted on various electronic devices. Electronic devices on which the circuit board 2 can be mounted include smartphones, tablets, game consoles, automotive electrical equipment, servers, and various other electronic devices.

1-2 Basic Structure of the Base 10 In one embodiment, the base 10 is made of an insulating material and has a rectangular parallelepiped shape. For example, the dimension (length dimension) of the coil component 1 in the L-axis direction is in the range of 0.5 mm to 6.0 mm, the dimension (width dimension) in the W-axis direction is in the range of 0.3 mm to 4.5 mm, and the dimension (height dimension) in the T-axis direction is in the range of 0.3 mm to 4.5 mm. In one embodiment, the length dimension of the coil component 1 may be greater than the width dimension. In this specification, the term "rectangular parallelepiped" or "rectangular parallelepiped shape" does not mean only "rectangular parallelepiped" in the mathematically strict sense. As described later, the corners and/or sides of the base 10 may be curved. The dimensions and shapes of the base 10 are not limited to those explicitly stated in this specification.

The base 10 has a first main surface 10a, a second main surface 10b, a first end surface 10c, a second end surface 10d, a first side surface 10e, and a second side surface 10f. The first end surface 10c, the second end surface 10d, the first side surface 10e, and the second side surface 10f are all connected to the first main surface 10a and the second main surface 10b. The first end surface 10c also connects the first side surface 10e and the second side surface 10f. The first main surface 10a and the second main surface 10b each form the surfaces at both ends of the height direction of the base 10, the first end surface 10c and the second end surface 10d each form the surfaces at both ends of the length direction of the base 10, and the first side surface 10e and the second side surface 10f each form the surfaces at both ends of the width direction of the base 10. As shown in FIG. 1, the first major surface 10a is located on the upper side of the base 10, and therefore the first major surface 10a may be referred to as the "upper surface." Similarly, the second major surface 10b may be referred to as the "lower surface" or "bottom surface."

In the illustrated embodiment, the second main surface 10b of the base 10 is provided with a first external electrode 21, a second external electrode 22, a third external electrode 23, and a fourth external electrode 24. When mounting the coil component 1 on the mounting board 2a, the second main surface 10b is disposed so as to face the mounting board 2a. For this reason, the second main surface 10b of the base 10 is sometimes called the "mounting surface." At least one of the first external electrode 21, the second external electrode 22, the third external electrode 23, and the fourth external electrode 24 may extend to a surface other than the lower surface 10b of the base 10. For example, the first external electrode 21 may extend so as to contact not only the lower surface 10b but also the end surface 10c.

The upper surface 10a and the lower surface 10b are spaced apart by the height dimension of the base 10, the first end surface 10c and the second end surface 10d are spaced apart by the length dimension of the base 10, and the first side surface 10e and the second side surface 10f are spaced apart by the width dimension of the base 10. In this specification, unless otherwise understood in the context, the "length" direction, "width" direction, and "thickness" direction of the magnetically coupled coil component 1 are the L-axis direction, W-axis direction, and T-axis direction in FIG. 1, respectively.

The base 10 is made of an insulating material with excellent insulating properties. The base 10 may be made of a magnetic material. As the magnetic material for the base 10, a soft magnetic alloy material, a composite magnetic material in which magnetic particles are dispersed in a resin, a ferrite material, or any other known magnetic material can be used.

1-3 Basic structure of coil conductor In the illustrated embodiment, the first coil conductor 25 is provided within the base 10 so as to face the upper surface 10a of the base 10. The second coil conductor 35 is provided within the base 10 so as to face the lower surface 10b of the base 10. Thus, the first coil conductor 25 is disposed above the second coil conductor 35 (i.e., on the positive side in the T-axis direction). Since a part of the insulating base 10 is interposed between the first coil conductor 25 and the second coil conductor 35, the first coil conductor 25 and the second coil conductor 35 are electrically insulated within the base 10.

The first coil conductor 25 has a first winding portion 25a, a first one-end lead-out portion 25b that connects one end of the first winding portion 25a to the first external electrode 21, and a first other-end lead-out portion 25c that connects the other end of the first winding portion 25a to the second external electrode 22. Similarly, the second coil conductor 35 has a second winding portion 35a, a second one-end lead-out portion 35b that connects one end of the second winding portion 35a to the third external electrode 23, and a second other-end lead-out portion 35c that connects the other end of the second winding portion 35a to the fourth external electrode 24.

The first winding portion 25a extends in the circumferential direction around the coil axis Ax that extends along the T axis. Like the first winding portion 25a, the second winding portion 35a extends in the circumferential direction around the coil axis Ax. In the illustrated embodiment, the coil axis Ax is parallel to the T axis. The coil axis Ax does not have to be parallel to the T axis. The coil axis Ax intersects with the upper surface 10a and the lower surface 10b of the base 10. Details of the first winding portion 25a and the second winding portion 35a will be described later.

The first one-end drawn portion 25b extends downward along the T-axis from one end of the first winding portion 25a. One end of the first one-end drawn portion 25b is connected to one end of the first winding portion 25a. The other end of the first one-end drawn portion 25b is exposed outside the base body 10 from the lower surface 10b. The first one-end drawn portion 25b is connected to the first external electrode 21 at the other end exposed from the lower surface 10b.

The first other-end drawn portion 25c extends downward along the T-axis from the other end of the first winding portion 25a. One end of the first other-end drawn portion 25c is connected to the other end of the first winding portion 25a (the end opposite to the end to which the first one-end drawn portion 25b is connected). The other end of the first other-end drawn portion 25c is exposed outside the base 10 from the lower surface 10b. The first other-end drawn portion 25c is connected to the second external electrode 22 at the other end exposed from the lower surface 10b.

The second one-end lead portion 35b extends downward along the T-axis from one end of the second winding portion 35a. One end of the second one-end lead portion 35b is connected to one end of the second winding portion 35a. The other end of the second one-end lead portion 35b is exposed outside the base body 10 from the lower surface 10b. The second one-end lead portion 35b is connected to the third external electrode 23 at the other end exposed from the lower surface 10b.

The second other-end lead-out portion 35c extends downward along the T-axis from the other end of the second winding portion 35a. One end of the second other-end lead-out portion 35c is connected to the other end of the second winding portion 35a (the end opposite to the end to which the second one-end lead-out portion 35b is connected). The other end of the second other-end lead-out portion 35c is exposed outside the base body 10 from the lower surface 10b. The second other-end lead-out portion 35c is connected to the fourth external electrode 24 at the other end exposed from the lower surface 10b.

As described above, in the illustrated embodiment, the first external electrode 21, the second external electrode 22, the third external electrode 23, and the fourth external electrode 24 are all provided on the lower surface 10b of the base 10, and the first one-end lead portion 25b, the first other-end lead portion 25c, the second one-end lead portion 35b, and the second other-end lead portion 35c are each drawn to the lower surface 10b and connected to the corresponding external electrode. Thus, according to the illustrated embodiment, the first coil conductor 25 is drawn from the lower surface 10b of the base 10, so that the current path from the land portion 3a through the first external electrode 21 and the first coil conductor 25 to the second land portion 3b via the second external electrode 22 can be shortened compared to the embodiment in which the first coil conductor 25 is drawn from a surface other than the lower surface 10b of the base 10, and thus the DC resistance (Rdc) of the circuit element including the first coil conductor 25 can be reduced. Similarly, in the illustrated embodiment, the second coil conductor 35 is pulled out from the bottom surface 10b of the base 10, and therefore the current path from the land portion 3c through the third external electrode 23 and the second coil conductor 25 to the fourth land portion 3d via the fourth external electrode 24 is made shorter than in a configuration in which the second coil conductor 35 is pulled out from a surface other than the bottom surface 10b of the base 10, thereby making it possible to reduce the DC resistance (Rdc) of the circuit element including the second coil conductor 25.

The surface of the first coil conductor 25 and the surface of the second coil conductor 35 may be covered with an insulating coating (not shown) made of an insulating material with excellent insulating properties. The insulating coating may be an oxide film formed on the surface of the first coil conductor 25 and the surface of the second coil conductor 35 during a heat treatment in the manufacturing process of the coil component 1. The insulating coating may be a coating film made of a resin with excellent insulating properties, such as polyurethane, polyamide-imide, polyimide, polyester, or polyester-imide.

1-4 Specific Description of the Magnetically Coupled Coil Component 1 Next, the magnetically coupled coil component 1 will be further described with reference to Fig. 2. Fig. 2 shows a cross section of the magnetically coupled coil component 1 taken along line II. Fig. 2 shows a cross section of the magnetically coupled coil component 1 taken along a plane that passes through the coil axis Ax and is parallel to the WT plane.

1-4-1 Description of the Base 10 As shown in FIG. 2, the base 10 is divided into a main body 11, an upper cover 12 disposed above the main body 11, and a lower cover 13 disposed below the main body 11. The upper surface of the main body 11 is in contact with the lower surface of the upper cover 12. The lower surface of the main body 11 is in contact with the upper surface of the lower cover 13. A first winding portion 25a and a second winding portion 25b are disposed inside the main body 11. The upper cover 12 does not include any of the members constituting the first coil conductor 25. The lower cover 13 does not include the first winding portion 25a and the second winding portion 25b, but includes a part of the first one-end drawn portion 25b, the first other-end drawn portion 25c, the second one-end drawn portion 35b, and the second other-end drawn portion 35c.

In one embodiment, the base 10 is a laminate in which a plurality of magnetic films are stacked. The main body 11 may be a laminate in which a magnetic film having a conductor pattern corresponding to the first winding portion 25a formed on its surface and a magnetic film having a conductor pattern corresponding to the second winding portion 35a formed on its surface are stacked, as described below. The upper cover 12 may be a laminate in which a plurality of magnetic films are stacked. The lower cover 13 may be a laminate in which a plurality of magnetic films are stacked. The magnetic film constituting the lower cover 13 has through holes formed therein for passing through the first one-end drawn-out portion 25b, the first other-end drawn-out portion 25c, the second one-end drawn-out portion 35b, and the second other-end drawn-out portion 35c, respectively.

The thickness of the main body 11 (dimension in the T-axis direction) can be changed depending on the number and film thickness of the magnetic films that make up the main body 11. For example, the thickness of the main body 11 can be increased by increasing the number of magnetic films that make up the main body 11. The thickness of the main body 11 can also be increased by increasing the thickness of each of the magnetic films that make up the main body 11. Similarly, the thickness of each of the upper cover part 12 and the lower cover part 13 can be adjusted through the number of magnetic films that make up each of the upper cover part 12 and the lower cover part 13 and/or the film thickness of each magnetic film.

In the embodiment shown in FIG. 2, the main body 11 is a laminated body formed by stacking magnetic films 11a, 11b, 11c, and 11d. However, the boundaries between the magnetic films 11a to 11d may not be visible even when the cross section of the base 110 is observed with an SEM. The main body 11 may include magnetic films other than the magnetic films 11a to 11d. Conductor patterns constituting a part of the first coil conductor 25 and the second coil conductor 35 are formed on the upper surfaces of the magnetic films 11a to 11d. In addition, through holes penetrating each magnetic film in the T-axis direction are formed at predetermined positions of the magnetic films 11a to 11d, and via conductors are embedded in the through holes. Each of the conductor patterns and via conductors of the coil component 1 is formed by printing a conductive paste made of a metal or alloy with excellent conductivity on a magnetic sheet, which is a precursor of the magnetic films 11a to 11d, by a screen printing method, and heating the conductive paste printed on the magnetic sheet. The conductive paste may be made of Ag, Pd, Cu, Al, or an alloy thereof. The conductor pattern and via conductors of the coil component 1 may be made of materials other than those mentioned above. The conductor pattern and via conductors of the coil component 1 may be made by, for example, a sputtering method, an inkjet method, or other known methods.

1-4-2 Structure of Coil Conductor Next, the first coil conductor 25 and the second coil conductor 35 will be further described with further reference to Figs. 3a to 3d.

3a, the first upper conductor pattern 25a1 is formed on the upper surface of the magnetic film 11a. The first upper conductor pattern 25a1 extends in the circumferential direction around the coil axis Ax by less than one turn in a plane (LW plane) perpendicular to the coil axis Ax. The number of turns of the conductor pattern extending in the circumferential direction around the coil axis Ax indicates the proportion of the area in which the conductor pattern is formed in the circumferential direction around the coil axis Ax. The number of turns of a given conductor pattern can be expressed using the central angle of the area in which the conductor pattern extends around the coil axis Ax. For example, in FIG. 3a, the first upper conductor pattern 25a1 extends in the circumferential direction around the coil axis Ax within a range of central angle α1, so the number of turns of the first upper conductor pattern 25a1 can be expressed as (α1/360) turns. For example, if α1 is 150°, the number of turns of the first upper conductor pattern 25a1 is about 0.42 turns.

A through hole is provided in the magnetic film 11a in the T-axis direction in an area that overlaps with one end of the first upper conductor pattern 25a1, and a via conductor that constitutes part of the first one-end lead-out portion 25b is embedded in this through hole. In addition, a through hole is provided in the magnetic film 11a in the T-axis direction in an area that overlaps with the other end of the first upper conductor pattern 25a1, and a via conductor V1 is embedded in this through hole.

As shown in FIG. 3b, a first lower conductor pattern 25a2 is formed on the upper surface of the magnetic film 11b. The first lower conductor pattern 25a2 extends for approximately one turn in the circumferential direction around the coil axis Ax in a plane (LW plane) perpendicular to the coil axis Ax. One end of the first lower conductor pattern 25a2 is connected to the via conductor V1. A through hole penetrating the magnetic film 11b in the T-axis direction is provided in the area of the magnetic film 11b that overlaps with the other end of the first lower conductor pattern 25a2, and a via conductor constituting part of the first other end lead portion 25c is embedded in this through hole.

In this way, the first upper conductor pattern 25a1 and the first lower conductor pattern 25a2 are connected by the via conductor V1. The first upper conductor pattern 25a1, the via conductor V1, and the first lower conductor pattern 25a2 connected in this way constitute the first winding portion 25a of the first coil conductor 25. Since the first upper conductor pattern 25a1 is wound around the coil axis Ax by approximately 0.42 turns and the first lower conductor pattern 25a2 is wound around the coil axis Ax by approximately 1 turn, the first winding portion 25a is wound around the coil axis Ax by approximately 1.42 turns.

In one embodiment, the number of turns of the first winding portion 25a is less than 2. The number of turns of the first winding portion 25a may be 1.5 or less. For example, when the magnetically coupled coil component 1 is used in a high-frequency circuit, the first coil conductor 25 is required to have a small inductance value. To achieve this small inductance value, the number of turns of the first winding portion 25a is less than 2.

As shown in FIG. 3c, a second upper conductor pattern 35a1 is formed on the upper surface of the magnetic film 11c. The second upper conductor pattern 35a1 extends for approximately one turn in the circumferential direction around the coil axis Ax in a plane (LW plane) perpendicular to the coil axis Ax. In the illustrated embodiment, the second upper conductor pattern 35a1 may have a shape symmetrical to the first lower conductor pattern 25a2 with respect to a straight line that passes through the coil axis and extends along the L axis.

A through hole is provided in the magnetic film 11c in the T-axis direction in an area overlapping one end of the second upper conductor pattern 35a1, and a via conductor constituting part of the second one-end lead-out part 35b is embedded in this through hole. In addition, a through hole is provided in the magnetic film 11c in the T-axis direction in an area overlapping the other end of the second upper conductor pattern 35a1, and a via conductor V2 is embedded in this through hole. Furthermore, a through hole is provided in the lower right corner of the magnetic film 11c in the T-axis direction, and a via conductor constituting part of the first other-end lead-out part 25c is embedded in this through hole.

As shown in FIG. 3d, a second lower conductor pattern 35a2 is formed on the upper surface of the magnetic film 11d. The second lower conductor pattern 35a2 extends circumferentially around the coil axis Ax for approximately 0.42 turns in a plane (LW plane) perpendicular to the coil axis Ax. The second lower conductor pattern 35a2 may have a shape symmetrical to the first upper conductor pattern 25a1 with respect to a straight line that passes through the coil axis and extends along the L axis.

One end of the second lower conductor pattern 35a2 is connected to the via conductor V2. A through hole penetrating the magnetic film 11d in the T-axis direction is provided in the area of the magnetic film 11d that overlaps with the other end of the second lower conductor pattern 35a2, and a via conductor constituting part of the second other end lead-out portion 35c is embedded in this through hole. Furthermore, a through hole penetrating the magnetic film 11c in the T-axis direction is provided in each of the lower right and upper left corners of the magnetic film 11d, and a via conductor constituting part of the first other end lead-out portion 25c is embedded in the through hole formed in the lower right corner. Furthermore, a via conductor constituting part of the second one end lead-out portion 35b is embedded in the through hole formed in the upper left corner.

In this way, the second upper conductor pattern 35a1 and the second lower conductor pattern 35a2 are connected by the via conductor V2. The second upper conductor pattern 35a1, the via conductor V2, and the second lower conductor pattern 35a2 connected in this way constitute the second winding portion 35a of the second coil conductor 35. Since the second upper conductor pattern 35a1 is wound around the coil axis Ax by about 1 turn and the second lower conductor pattern 35a2 is wound around the coil axis Ax by about 0.42 turns, the second winding portion 35a is wound around the coil axis Ax by about 1.42 turns.

In one embodiment, the number of turns of the first winding portion 25a and the second winding portion 35a is less than 2 turns each. The number of turns of the first winding portion 25a and the second winding portion 35a may be 1.5 turns or less each. For example, when the magnetically coupled coil component 1 is used in a high-frequency circuit, the first coil conductor 25 and the second coil conductor 35 are each required to have a small inductance value. To achieve this small inductance value, the number of turns of the first winding portion 25a and the second winding portion 35a is less than 2.

As shown in the example, the first winding portion 25a having less than two turns is obtained by joining the conductor patterns formed over two layers with via conductors. Similarly, the second winding portion 35a having less than two turns is obtained by joining the conductor patterns formed over two layers with via conductors. Thus, the first winding portion 25a is obtained by stacking two magnetic films, and the second winding portion 35a is obtained by stacking another two magnetic films. On the other hand, when the number of turns is two or more, it is necessary to connect the conductor patterns formed on each of the three or more magnetic films with via conductors. Therefore, by making the number of turns of the first winding portion 25a and the second winding portion 35a less than two, the number of magnetic films constituting each of the first winding portion 25a and the second winding portion 35a can be two, so that the height dimension of the magnetically coupled coil component 1 can be reduced compared to the embodiment in which the number of turns of the first winding portion 25a and the second winding portion 35a is two or more.

As can be seen from Figures 3b to 3d, not only the magnetic film 11a but also each of the magnetic films 11b to 11d have through holes for embedding the via conductors constituting the first one-end drawn portion 25b, and the via conductors are embedded in these through holes. Although not shown, each of the magnetic films constituting the lower cover part 13 also has through holes for embedding the via conductors constituting the first one-end drawn portion 25b, and the via conductors are embedded in these through holes. Since the via conductors embedded in these through holes are formed at the same position in a plan view, the via conductors adjacent in the T-axis direction are electrically connected to each other. In this way, the first one-end drawn portion 25b is formed by joining the via conductors embedded in the through holes formed in the magnetic films constituting the magnetic films 11a to 11d and the lower cover part 13. The first other end drawn-out portion 25c, the second one end drawn-out portion 35b, and the second other end drawn-out portion 35c are also formed by joining via conductors embedded in a magnetic film, similar to the first one end drawn-out portion 25b.

Next, the shapes of the first coil conductor 25 and the second coil conductor 35 will be further described with reference to Figures 4 and 5. Figure 4 shows a perspective view of the magnetically coupled coil component 1 seen through the base 10 from the positive side of the T axis. Figure 5 shows a perspective view of the magnetically coupled coil component 1 seen through the base 10 from the negative side of the T axis.

4 and 5, when the magnetically coupled coil component 1 is viewed from the T-axis direction, a part of the first winding portion 25a extends along an elliptical closed loop orbit CL1. Since the first one-end lead-out portion 25b and the first other-end lead-out portion 25c are provided near the upper right and lower right corners of the base body 10 in a plan view, a part of the first winding portion 25a leaves the closed loop orbit CL and extends toward the first one-end lead-out portion 25b and the first other-end lead-out portion 25c. The shape of the closed loop orbit CL is not limited to an elliptical shape. The shape of the closed loop orbit CL may be an oval, a circle, a rectangle, a polygon, or a shape other than these in a plan view. Like the first winding portion 25a, a part of the second winding portion 35a extends along an elliptical closed loop orbit CL2. The description of the first winding portion 25a in this paragraph also applies to the second winding portion 35a.

In the illustrated embodiment, the width dimension W11 of the first winding portion 25a is equal to the width dimension W12 of the second winding portion 35a. The width dimension W11 of the first winding portion 25a is the dimension of the first winding portion 25a in a direction perpendicular to the closed loop trajectory CL1. Similarly, the width dimension W12 of the second winding portion 35a is the dimension of the second winding portion 35a in a direction perpendicular to the closed loop trajectory CL2.

1-4-3 Arrangement of Coil Conductors Next, the arrangement of the first coil conductor 25 and the second coil conductor 35 will be described mainly with reference to FIG.

2, the first coil conductor 25 is disposed inside the base 10 such that the upper surface of the first winding portion 25a (specifically, the upper surface of the first upper conductor pattern 25a1) is separated from the upper surface 10a of the base 10 by a first distance T1 in the T-axis direction. The upper surface of the first winding portion 25a faces the upper surface 10a of the base 10. In a cross section of the magnetically coupled coil component 1 cut along the coil axis Ax, if the distance between the upper surface of the first winding portion 25a and the upper surface 10a of the base 10 is not constant, three points are taken on the upper surface of the first winding portion 25a at equal intervals in the W-axis direction, and the average of the distances in the T-axis direction between each of these three points and the upper surface 10a of the base 10 can be taken as the first distance T1 in the T-axis direction between the upper surface of the first winding portion 25a and the upper surface 10a of the base 10.

The second coil conductor 25 is disposed inside the base 10 such that the lower surface of the second winding portion 35a (specifically, the lower surface of the second lower conductor pattern 35a2) is separated from the lower surface 10b of the base 10 by a second distance T2 in the T-axis direction. The lower surface of the second winding portion 35a faces the lower surface 10b of the base 10. In a cross section of the magnetically coupled coil component 1 cut along the coil axis Ax, if the distance between the lower surface of the second winding portion 35a and the lower surface 10b of the base 10 is not constant, three points are taken on the lower surface of the second winding portion 25b at equal intervals in the W-axis direction, and the average of the distances in the T-axis direction between each of these three points and the lower surface 10b of the base 10 can be taken as the second distance T2 in the T-axis direction between the lower surface of the second winding portion 35a and the lower surface 10b of the base 10.

In one embodiment, the first coil conductor 25 and the second coil conductor 35 are arranged such that the first distance T1 in the T-axis direction between the upper surface of the first winding portion 25a and the upper surface 10a of the base 10 is greater than the second distance T2 in the T-axis direction between the lower surface of the second winding portion 35a and the lower surface 10b of the base 10.

1-4-4 Comparison with conventional magnetically coupled coil components In conventional magnetically coupled coil components having a pair of coil conductors arranged vertically within a base, in order to prevent localized large magnetic resistance within the base, the pair of coil conductors are arranged so that the distance between the upper coil conductor of the pair and the top surface of the base (the distance corresponding to the first distance T1 in Figure 2) is equal to the distance between the lower coil conductor of the pair and the bottom surface of the base (the distance corresponding to the second distance T2 in Figure 2).

In contrast, in the first embodiment of the present application, the first distance T1 in the T-axis direction between the upper surface of the first winding portion 25a and the upper surface 10a of the base 10 is greater than the second distance T2 in the T-axis direction between the lower surface of the second winding portion 35a and the lower surface 10b of the base 10. In other words, the first coil conductor 25 and the second coil conductor 35 are biased downward (toward the negative side of the T-axis direction) in the T-axis direction. Therefore, in the magnetically coupled coil component 1 of the present application, the length of the pull-out portion for pulling out each coil conductor can be shortened compared to a conventional magnetically coupled coil component in which a set of coil conductors is evenly arranged in the vertical direction. Specifically, the first coil conductor 25 of the present application is arranged so that the first distance T1 in the T-axis direction between the upper surface of the first winding portion 25a and the upper surface 10a of the base 10 is greater than the second distance T2 in the T-axis direction between the lower surface of the second winding portion 35a and the lower surface 10b of the base 10. This allows the length of the first one-end lead portion 25b and the first other-end lead portion 25c that lead the first coil conductor 25 to the lower surface 10b to be shorter than the length of the lead portions in a conventional magnetically coupled coil component in which a set of coil conductors is evenly arranged in the vertical direction. Similarly, the length of the second one-end lead portion 35b and the second other-end lead portion 35c that lead the second coil conductor 35 to the lower surface 10b can be shorter than the length of the lead portions in a conventional magnetically coupled coil component.

In the magnetically coupled coil component 1, the magnetic flux that contributes to the magnetic coupling between the first coil conductor 25 and the second coil conductor 35 is generated from the first winding portion 25a in the first coil conductor 25, and is generated from the second winding portion 35a in the second coil conductor 35. In the first coil conductor 25, magnetic flux is also generated from the first one-end lead-out portion 25b and the first other-end lead-out portion 25c, but the magnetic flux generated from the first one-end lead-out portion 25b and the first other-end lead-out portion 25c does not interlink with the second winding portion 35a of the second coil conductor 35, and therefore does not contribute to improving the magnetic coupling between the first coil conductor 25 and the second coil conductor 35. In the magnetically coupled coil component 1 according to the first embodiment, the first distance T1 is arranged to be greater than the second distance T2, so that the lengths of the first one-end lead portion 25b and the first other-end lead portion 25c that lead the first coil conductor 25 to the lower surface 10b can be shortened, and the proportion of the first winding portion 25a in the entire length of the first coil conductor 25 can be increased. Making the first distance T1 greater than the second distance T2 also contributes to strengthening the magnetic coupling of the second coil conductor 35. That is, since the first distance T1 is greater than the second distance T2, the lengths of the second one-end lead portion 35b and the second other-end lead portion 35c that lead the second coil conductor 35 to the lower surface 10b can be shortened, and the proportion of the second winding portion 35a in the entire length of the second coil conductor 35 can be increased. In this way, in the magnetically coupled coil component 1, the magnetic coupling between the first coil conductor 25 and the second coil conductor 35 can be improved by arranging the first coil conductor 25 and the second coil conductor 35 so that the first distance T1 is greater than the second distance T2.

In one aspect, the first winding portion 25a of the first coil conductor 25 is wound around the coil axis Ax by less than two turns. Therefore, in the first coil conductor 25, the proportion of the first one-end lead portion 25b and the first other-end lead portion 25c in the total length is large compared to a coil conductor having a winding portion with two or more turns. Therefore, by making the first distance T1 larger than the second distance T2 and shortening the length of the first one-end lead portion 25b and the first other-end lead portion 25c, the degree of coupling between the first coil conductor 25 and the second coil conductor 35 can be greatly improved. Conversely, when the proportion of the winding portion in the total length of one coil conductor is large, the length, shape, and arrangement of the winding portion have a large effect on the degree of coupling with other coil conductors, so that the improvement in the degree of coupling is limited even if the length of the lead portion is shortened. In the first embodiment of the present application, the proportion of the first one-end lead portion 25b and the first other-end lead portion 25c in the total length of the first coil conductor 25 is large, so by making the first distance T1 larger than the second distance T2, it is possible to greatly improve the coupling between the first coil conductor 25 and the second coil conductor 35. The fact that the second winding portion 35a of the second coil conductor 35 is less than two turns also contributes to greatly improving the degree of coupling between the first coil conductor 25 and the second coil conductor 35.

1-4-5 Manufacturing Method Next, a description will be given of an example of a manufacturing method of the magnetically coupled coil component 1. The magnetically coupled coil component 1 can be manufactured by, for example, a lamination process. In the following, a description will be given of an example of a manufacturing method of the magnetically coupled coil component 1 by a sheet lamination method.

First, a magnetic sheet is prepared as a precursor for each of the magnetic films (including magnetic films 11a to 11d) that make up the substrate 10. The magnetic sheet is prepared, for example, by mixing soft magnetic metal powder with resin to prepare a slurry, applying this slurry to the surface of a plastic base film using a doctor blade method or another common method, drying it, and cutting the dried slurry to a specified size.

Next, a through hole is formed in the T-axis direction through each magnetic sheet at a predetermined position of each magnetic sheet, which is the precursor of the magnetic film 11a to the magnetic film 11d. Next, a conductive paste is printed on the upper surface of each magnetic sheet, which is the precursor of the magnetic film 11 to the magnetic film 11d, by screen printing, to form an unfired conductor pattern on the magnetic sheet, and the conductive paste is embedded in the through hole formed in each magnetic sheet. The unfired conductor pattern formed on the magnetic sheet, which is the precursor of the magnetic film 11a, becomes the first upper conductor pattern 25a1 after heating, and the unfired conductor pattern formed on the magnetic sheet, which is the precursor of the magnetic film 11b, becomes the first lower conductor pattern 25a2 after heating. In addition, the unfired conductor pattern formed on the magnetic sheet, which is the precursor of the magnetic film 11c, becomes the second upper conductor pattern 35a1 after heating, and the unfired conductor pattern formed on the magnetic sheet, which is the precursor of the magnetic film 11d, becomes the second lower conductor pattern 35a2 after heating. Each conductor pattern can be formed using various known methods other than screen printing.

The magnetic sheet that serves as the precursor of magnetic film 11a may be a single magnetic sheet, or may be a laminated sheet made up of multiple magnetic sheets stacked together. Similarly, the magnetic sheet that serves as the precursor of each of magnetic films 11b to 11d may be a single magnetic sheet, or may be a laminated sheet made up of multiple magnetic sheets stacked together. By adjusting the number of magnetic sheets that make up magnetic films 11a to 11d, the thickness of each of magnetic films 11a to 11d can be adjusted.

Next, the magnetic sheets which are the precursors of the magnetic films 11a to 11d, the multiple magnetic sheets which are the precursors of the upper cover part 12, and the multiple magnetic sheets which are the precursors of the lower cover part 13 are stacked to obtain a laminate. In this laminate, the number of magnetic sheets included in the precursor of the upper cover part 12 is made greater than the number of magnetic sheets included in the precursor of the lower cover part 13, so that the first distance T1 can be made greater than the second distance T2 in the finished magnetically coupled coil component 1. The stacked magnetic sheets may be thermocompressed by a press machine. Next, the main body laminate is divided into pieces of the desired size using a cutting machine such as a dicing machine or a laser processing machine to obtain a chip laminate. The ends of the chip laminate may be polished by barrel polishing or the like as necessary.

Next, the chip stack is degreased, and the degreased chip stack is heat-treated to obtain the base 10. This heat treatment forms an oxide layer on the surface of each of the soft magnetic metal powder particles contained in the magnetic sheet, and adjacent soft magnetic metal powder particles are bonded together via the oxide layer. The chip stack is heat-treated at a heating temperature of 600°C to 800°C for a heating time of 20 to 120 minutes, for example.

Next, a conductive paste is applied to the lower surface 10b of the base 10 to form the first external electrode 21, the second external electrode 22, the third external electrode 23, and the fourth external electrode 24. The first external electrode 21, the second external electrode 22, the third external electrode 23, and the fourth external electrode 24 may include a plating layer. This plating layer may be two or more layers. The two plating layers may include a Ni plating layer and a Sn plating layer provided on the outside of the Ni plating layer.

The above steps result in the magnetically coupled coil component 1. The magnetically coupled coil component 1 may be produced by compression molding, thin film processing, slurry building, or other known methods.

Some of the steps included in the above manufacturing method may be omitted as appropriate. In the manufacturing method of coil component 1, steps not explicitly described in this specification may be performed as necessary. Some of the steps included in the manufacturing method of coil component 1 may be performed in a different order at any time, as long as this does not deviate from the spirit of the present invention. Some of the steps included in the manufacturing method of coil component 1 may be performed simultaneously or in parallel, if possible.

1-4-6 Simulation Results The present inventors performed a simulation to verify the relationship between the first distance T1 and the second distance T2 and the coupling coefficient for the magnetically coupled coil component 1. Specifically, ten types of magnetically coupled coil components 1 with sample numbers S1 to S10 in which the first distance T1 and the second distance T2 are the values shown in Table 1 were set in a simulator, and the self-inductance of the first coil conductor 25, the self-inductance of the second coil conductor 35, and the mutual inductance between the first coil conductor 25 and the second coil conductor 35 were calculated for each of the ten types of magnetically coupled coil components 1. Then, based on the self-inductance and the mutual inductance, the coupling coefficient k between the first coil conductor 25 and the second coil conductor 35 was calculated for each sample. The coupling coefficient k calculated in this manner is also shown in Table 1.

As shown in Table 1, the absolute value of the coupling coefficient in samples S1 to S5, in which the first distance T1 is greater than the second distance T2, is greater than the absolute value of the coupling coefficient in sample S6, in which the first distance T1 and the second distance T2 are equal. The absolute value of the coupling coefficient in samples S1 to S5 is also greater than the absolute value of the coupling coefficient in samples S7 to S10, in which the first distance T1 is smaller than the second distance T2. From the above, it was confirmed that by making the first distance T1 greater than the second distance T2, the coupling between the first coil conductor 25 and the second coil conductor 35 in the magnetically coupled coil component 1 is strengthened. Even if parameters other than the first distance T1 and the second distance T2 (for example, the shape of the first winding portion 25a and the second winding portion 35a, the dimensions of the base 10) are changed in the simulation, the result was obtained that the coupling between the first coil conductor 25 and the second coil conductor 35 in the magnetically coupled coil component 1 is strengthened by making the first distance T1 greater than the second distance T2.

2. Second Embodiment Next, a magnetically coupled coil component 101 according to a second embodiment of the present invention will be described.

2-1 Background When the number of turns in the winding parts of the multiple coil conductors included in a magnetically coupled coil component is small (for example, when the number of turns is less than two), the difference in length between the coil conductors is likely to be large, and as a result, there is a problem that the difference in inductance value between the coil conductors is likely to be large. When the number of turns in the winding part is large, the proportion of the winding part in the total length of the coil conductor is large, so if the number of turns in the winding parts of the multiple coil conductors is equal, the overall length of the coil conductors will be roughly equal. Therefore, the difference in inductance value caused by the difference in length between the multiple coil conductors is unlikely to be a problem.

On the other hand, when the number of turns in the winding portion of the coil conductor is small, the proportion of the winding portion to the overall length of the coil conductor is small, so even if the number of turns in the winding portions of multiple coil conductors is equal, the difference in the overall length of the coil conductors will be large due to differences in the lengths of the pull-out portions. For this reason, in magnetically coupled coil components in which coil conductors with a small number of turns in the winding portion are coupled together, it is desirable to reduce the difference in self-inductance value caused by differences in length between the coil conductors.

Below, we will explain the magnetically coupled coil component 101 that solves or alleviates the above problems with reference to Figures 6 and 7.

6 and 7 show a magnetically coupled coil component 101 according to a second embodiment. The magnetically coupled coil component 101 differs from the magnetically coupled coil component 1 in that, instead of the second coil conductor 35, the magnetically coupled coil component 101 includes a second coil conductor 135 having a smaller width dimension than the second coil conductor 35. In the following, the second coil conductor 135 included in the magnetically coupled coil component 101 will be mainly described, and a description of the points in the magnetically coupled coil component 101 that are common to the magnetically coupled coil component 1 will be omitted.

Figure 6 shows a perspective view of the magnetically coupled coil component 101 seen through the base 10 from the positive side of the T axis, and Figure 7 shows a perspective view of the magnetically coupled coil component 101 seen through the base 10 from the negative side of the T axis. As shown in Figure 7, the second coil conductor 135 has a second winding portion 135a, a second one-end lead-out portion 35b that connects one end of the second winding portion 135a to the third external electrode 23, and a second other-end lead-out portion 35c that connects the other end of the second winding portion 135a to the fourth external electrode 24.

The second coil conductor 135 is configured so that the width dimension W22 of the second winding portion 135a is smaller than the width dimension W11 of the first winding portion 25a. In other words, the width dimension W11 of the first winding portion 25a is larger than the width dimension W22 of the second winding portion 135a. For this reason, in FIG. 7, the radially inner edge of the first winding portion 25a behind the second winding portion 135a protrudes into the inner region of the second winding portion 135a. The width dimension W11 of the first winding portion 25a is the dimension of the first winding portion 25a in a direction perpendicular to the closed loop orbit CL1, and the width dimension W22 of the second winding portion 135a is the dimension of the second winding portion 135a in a direction perpendicular to the closed loop orbit CL2. In the illustrated embodiment, the thickness dimension of the first winding portion 25a is the same as the thickness dimension of the second winding portion 135a. The thickness dimension of the first winding portion 25a may be different from the thickness dimension of the second winding portion 135a. The thickness dimension of the first winding portion 25a is the dimension of the first winding portion 25a in the direction along the coil axis Ax (T-axis direction). The thickness dimension of the second winding portion 135a is the dimension of the second winding portion 135a in the direction along the coil axis Ax.

The width dimension W11 can be, for example, 1.05 times or more, 1.1 times or more, 1.15 times or more, or 1.2 times or more of the width dimension W22. For example, the width dimension W11 may be set by calculating the inductance value of the first coil conductor 25 and the inductance value of the second coil conductor 135 using a simulator, and the difference between the calculated inductance values is 5% or less of the inductance value of the first coil conductor 25. If the difference between the inductance value of the second coil conductor 135 and the inductance value of the first coil conductor 25 is 5% or less of the inductance value of the first coil conductor 25, the inductance value of the first coil conductor 25 and the inductance value of the second coil conductor 135 can be regarded as the same value in practical use of the magnetically coupled coil component 101.

As described above, in the magnetically coupled coil component 101, the width dimension W11 of the first winding portion 25a is larger than the width dimension W22 of the second winding portion 135a, so the magnetic path length through which the magnetic flux generated by the change in the current flowing through the first coil conductor 25 passes is longer than the magnetic path length through which the magnetic flux generated by the change in the current flowing through the second coil conductor 25 passes. Therefore, by making the width dimension W11 of the first winding portion 25a of the first coil conductor 25 larger than the width dimension W22 of the second winding portion 135a of the second coil conductor 135 (in other words, making the width dimension W22 of the second winding portion 135a of the second coil conductor 135 smaller than the width dimension W11 of the first winding portion 25a of the first coil conductor 25), the inductance value of the first coil conductor 25 can be made smaller than the inductance value of the second coil conductor 135, compared to when the width dimension W11 and the width dimension W22 are equal.

In the coupled coil component 101, the first coil conductor 25 is disposed higher in the T-axis direction than the second coil conductor 135, and therefore the overall length of the first coil conductor 25 is longer than the overall length of the second coil conductor 135. Therefore, when the width dimension W11 of the first winding portion 25a of the first coil conductor 25 and the width dimension W22 of the second winding portion 135a of the second coil conductor 135 are equal, the inductance value of the first coil conductor 25 will be greater than the inductance value of the second coil conductor 135, provided that other conditions are the same.

In the coupled coil component 101, by making the width dimension W11 of the first winding portion 25a of the first coil conductor 25 larger than the width dimension W22 of the second winding portion 135a of the second coil conductor 135, the inductance value of the first coil conductor 25 can be made smaller than the inductance value of the second coil conductor 135, compared to when the width dimension W11 and the width dimension W22 are equal. In other words, by making the width dimension W11 of the first winding portion 25a of the first coil conductor 25 larger than the width dimension W22 of the second winding portion 135a of the second coil conductor 135, the inductance value of the first coil conductor 25 can be made closer to the inductance value of the second coil conductor 135. Therefore, in the magnetically coupled coil component 101, the difference between the inductance value of the first coil conductor 25 and the inductance value of the second coil conductor 135 can be made smaller than in a magnetically coupled coil component in which the width dimensions of the winding portions of multiple coil conductors are equal.

In the magnetically coupled coil component 101, similarly to the magnetically coupled coil component 1, the first distance T1 in the T-axis direction between the upper surface of the first winding portion 25a and the upper surface 10a of the base 10 may be greater than the second distance T2 in the T-axis direction between the lower surface of the second winding portion 135a and the lower surface 10b of the base 10. In this case, the coupling between the first coil conductor 25 and the second coil conductor 135 can be improved, and the difference between the inductance value of the first coil conductor 25 and the inductance value of the second coil conductor 135 can be reduced.

In the magnetically coupled coil component 101, unlike the magnetically coupled coil component 1, the first distance T1 in the T-axis direction between the upper surface of the first winding portion 25a and the upper surface 10a of the base 10 and the second distance T2 in the T-axis direction between the lower surface of the second winding portion 135a and the lower surface 10b of the base 10 may be equal to each other. In this case, making the first distance T1 larger than the second distance T2 does not have the effect of improving the degree of coupling, but it is possible to reduce the difference between the inductance value of the first coil conductor 25 and the inductance value of the second coil conductor 135.

Coil component 101 is manufactured in accordance with the manufacturing method of coil component 1.

2-3 Simulation Results The present inventors performed a simulation to verify the relationship between the width dimension W11 of the first winding portion 25a of the first coil conductor 25 and the width dimension W22 of the second winding portion 135a of the second coil conductor 135, and the difference (ΔL) between the self-inductance of the first coil conductor 25 and the self-inductance of the second coil conductor 135, for the magnetically coupled coil component 101. Specifically, eight types of magnetically coupled coil components 101 with sample numbers S21 to S28 in which the width dimension W11 of the first winding portion 25a and the width dimension W22 of the second winding portion 135a have the values shown in Table 2 were set in a simulator, and the self-inductance L1 of the first coil conductor 25 and the self-inductance L2 of the second coil conductor 135 were calculated for each of the eight types of magnetically coupled coil components 101. Then, for each sample, the difference ΔL (=L1−L2) between the self-inductance L1 of the first coil conductor 25 and the self-inductance L2 of the second coil conductor 135 was calculated.

As shown in Table 2, the inductance difference ΔL in samples S25 to S28, in which the width dimension W11 is greater than the width dimension W22, is smaller than the inductance difference ΔL in sample S24, in which the width dimensions W11 and W22 are equal. Also, the inductance difference ΔL in samples S25 to S28 is smaller than the inductance difference ΔL in samples S21 to S23, in which the width dimension W11 is smaller than the width dimension W22. From the above, it was confirmed that by making the width dimension W11 greater than the width dimension W22, the difference ΔL between the self-inductance of the first coil conductor 25 and the self-inductance of the second coil conductor 135 in the magnetically coupled coil component 101 is reduced. Even if parameters other than the width dimension W11 and the width dimension W22 (e.g., the shapes of the first winding portion 25a and the second winding portion 35a, the dimensions of the base 10) were changed in the simulation, the result remained the same: by making the width dimension W11 larger than the width dimension W22, the difference ΔL between the self-inductance of the first coil conductor 25 and the self-inductance of the second coil conductor 135 in the magnetically coupled coil component 101 can be reduced.

3 Third embodiment 3-1 Description of magnetically coupled coil component 201 Next, another embodiment capable of reducing the difference in inductance value between the coil conductors will be described with reference to Fig. 8. The magnetically coupled coil component 201 differs from the magnetically coupled coil component 1 in that it includes a first coil conductor 125 instead of the first coil conductor 25. In the following, the first coil conductor 125 included in the magnetically coupled coil component 201 will be mainly described, and a description of the points in the magnetically coupled coil component 201 that are common to the magnetically coupled coil component 1 will be omitted.

Figure 8 shows a cross section of the magnetically coupled coil component 201 cut by a plane passing through the coil axis Ax and parallel to the WT plane. As shown in Figure 8, the first coil conductor 125 has a first winding portion 125a, a first one-end lead portion 25b that connects one end of the first winding portion 125a to the first external electrode 21, and a first other-end lead portion 25c that connects the other end of the first winding portion 125a to the second external electrode 22.

In the third embodiment shown in FIG. 8, the thickness dimension T11 of the first winding portion 125a is larger than the thickness dimension T12 of the second winding portion 35a. The thickness dimension T11 of the first winding portion 125a is the dimension of the first winding portion 125a in the direction along the coil axis Ax (T-axis direction). The thickness dimension T12 of the second winding portion 35a is the dimension of the second winding portion 35a in the direction along the coil axis Ax (T-axis direction). In the illustrated embodiment, the width dimension of the first winding portion 125a is the same as the width dimension of the second winding portion 35a. The width dimension of the first winding portion 125a may be different from the width dimension of the second winding portion 35a. The width dimension of the first winding portion 125a can be determined in the same manner as the width dimension W11 of the first winding portion 25a described above. The width dimension of the second winding portion 35a can be determined in the same manner as the width dimension W22 of the second winding portion 135a described above.

The thickness dimension T11 of the first winding portion 125a can be, for example, 1.1 times or more, 1.3 times or more, 1.5 times or more, or 1.7 times or more the thickness dimension T12 of the second winding portion 35a. The thickness dimension T11 may be set, for example, by calculating the inductance values of the first coil conductor 125 and the second coil conductor 35 using a simulator, so that the difference between the calculated inductance values is 5% or less of the inductance value of the second coil conductor 35. If the difference between the inductance value of the second coil conductor 35 and the inductance value of the first coil conductor 125 is 5% or less of the inductance value of the first coil conductor 125, the inductance value of the first coil conductor 125 and the inductance value of the second coil conductor 35 can be considered to be the same value in practical use of the magnetically coupled coil component 201.

As described above, in the magnetically coupled coil component 201, the thickness dimension T11 of the first winding portion 125a is larger than the thickness dimension T12 of the second winding portion 35a, so the magnetic path length through which the magnetic flux generated by the change in current flowing through the first coil conductor 125 passes is longer than the magnetic path length through which the magnetic flux generated by the change in current flowing through the second coil conductor 35 passes. Therefore, the fact that the thickness dimension T11 of the first winding portion 125a of the first coil conductor 125 is larger than the thickness dimension T12 of the second winding portion 35a of the second coil conductor 35 acts to make the inductance value of the first coil conductor 125 smaller than the inductance value of the second coil conductor 35.

In the magnetically coupled coil component 201, the first coil conductor 125 is disposed higher in the T-axis direction than the second coil conductor 35, and therefore the overall length of the first coil conductor 125 is longer than the overall length of the second coil conductor 35. Therefore, if the thickness dimension T11 of the first winding portion 125a of the first coil conductor 125 and the thickness dimension T12 of the second winding portion 35a of the second coil conductor 35 are equal, the inductance value of the first coil conductor 125 will be greater than the inductance value of the second coil conductor 35, provided that other conditions are the same.

In the magnetically coupled coil component 201, the ratio of the inductance value of the first coil conductor 125 to the inductance value of the second coil conductor 35 can be reduced by making the thickness dimension T11 of the first winding portion 125a of the first coil conductor 125 larger than the thickness dimension T12 of the second winding portion 35a of the second coil conductor 35. In other words, by making the thickness dimension T11 of the first winding portion 125a of the first coil conductor 125 larger than the thickness dimension T12 of the second winding portion 35a of the second coil conductor 35, the inductance value of the first coil conductor 125 can be made closer to the inductance value of the second coil conductor 35. Therefore, in the magnetically coupled coil component 201, the difference between the inductance value of the first coil conductor 125 and the inductance value of the second coil conductor 35 can be reduced compared to when the thickness direction dimensions of the winding portions of multiple coil conductors are equal.

In the magnetically coupled coil component 201, similarly to the magnetically coupled coil component 1, the first distance T1 in the T-axis direction between the upper surface of the first winding portion 125a and the upper surface 10a of the base 10 may be greater than the second distance T2 in the T-axis direction between the lower surface of the second winding portion 135a and the lower surface 10b of the base 10. In this case, the coupling between the first coil conductor 125 and the second coil conductor 35 can be improved, and the difference between the inductance value of the first coil conductor 125 and the inductance value of the second coil conductor 35 can be reduced.

In the magnetically coupled coil component 201, unlike the magnetically coupled coil component 1, the first distance T1 in the T-axis direction between the upper surface of the first winding portion 125a and the upper surface 10a of the base 10 and the second distance T2 in the T-axis direction between the lower surface of the second winding portion 35a and the lower surface 10b of the base 10 may be equal to each other. In this case, making the first distance T1 larger than the second distance T2 does not have the effect of improving the degree of coupling, but it is possible to reduce the difference between the first inductance value of the first coil conductor 125 and the second inductance value of the second coil conductor 35.

The coil component 201 is manufactured in accordance with the manufacturing method of the coil component 1 .
3-2 Simulation Results The present inventors performed a simulation to verify the relationship between the thickness T11 of the first winding portion 125a of the first coil conductor 125 and the thickness dimension T12 of the second winding portion 35a of the second coil conductor 35, and the difference (ΔL) between the self-inductance of the first coil conductor 125 and the self-inductance of the second coil conductor 35, for the magnetically coupled coil component 201. Specifically, eight types of magnetically coupled coil components 201 with sample numbers S31 to S38, in which the thickness dimension T11 of the first winding portion 125a and the thickness dimension T12 of the second winding portion 35a have the values shown in Table 3, were set in a simulator, and the self-inductance L1 of the first coil conductor 125 and the self-inductance L2 of the second coil conductor 35 were calculated for each of the eight types of magnetically coupled coil components 201. Then, for each sample, the difference ΔL (=L1−L2) between the self-inductance L1 of the first coil conductor 125 and the self-inductance L2 of the second coil conductor 35 was calculated.

As shown in Table 3, the inductance difference ΔL in samples S31 to S34, in which the thickness dimension T11 is greater than the thickness dimension T12, is smaller than the inductance difference ΔL (=3.3) in sample S35, in which the thickness dimension T11 and the thickness dimension T12 are equal. Also, the inductance difference ΔL in samples S31 to S34 is smaller than the inductance difference ΔL in samples S36 to S38, in which the thickness dimension T11 is smaller than the thickness dimension T12. From the above, it was confirmed that by making the thickness T11 greater than the thickness dimension T12, the difference ΔL between the self-inductance of the first coil conductor 125 and the self-inductance of the second coil conductor 35 in the magnetically coupled coil component 201 becomes smaller than the inductance difference ΔL (=3.3) when the thickness T11 and the thickness dimension T12 are equal. Even if parameters other than the thickness dimension T11 and the thickness dimension T12 (e.g., the shapes of the first winding portion 125a and the second winding portion 35a, the dimensions of the base 10) were changed in the simulation, the result remained the same: by making the thickness dimension T11 larger than the thickness dimension T12, the difference ΔL between the self-inductance of the first coil conductor 125 and the self-inductance of the second coil conductor 35 in the magnetically coupled coil component 201 can be made smaller than the inductance difference Δ when the thickness dimension T11 and the thickness dimension T12 are equal.

4. Fourth embodiment (array type coil component 301)
Next, an array type coil component 301 in which a plurality of magnetically coupled coil components 1 are packaged as one element will be described.

The array coil component 301 will be described below with reference to Figures 9 and 10.

Figure 9 shows a perspective view of an array coil component 301 according to the fourth embodiment, and Figure 10 shows a transparent view of the array coil component 301 as viewed from the top. As shown in these figures, the array coil component 301 has three magnetically coupled coils 301a, 301b, and 301c. The number of magnetically coupled coil components provided in the array coil component 301 is not limited to three, and may be two, or four or more.

As shown in FIG. 9, the array coil component 301 includes a base 310, on which the coil conductors constituting the magnetically coupled coils 301a, 301b, and 301c are provided. The base 310, like the base 10, is made of an insulating material and electrically insulates the coil conductors constituting the magnetically coupled coils 301a, 301b, and 301c from each other.

The base 310 has an upper surface 310a, a lower surface 310b, a first end surface 310c, a second end surface 310d, a first side surface 310e, and a second side surface 310f. The base 310 is configured similarly to the base 10, except that the dimension in the L-axis direction is larger to accommodate each coil conductor constituting the three magnetically coupled coils. The above description of the base 10 also applies to the base 310 as much as possible. For example, similar to the base 10, the upper surface 310a and the lower surface 310b of the base 310 form the surfaces at both ends of the base 310 in the T-axis direction, the first end surface 310c and the second end surface 310d form the surfaces at both ends of the base 310 in the L-axis direction, and the first side surface 310e and the second side surface 310f form the surfaces at both ends of the base 310 in the W-axis direction. For ease of explanation, Figures 9 and 10 show an X1 axis that extends parallel to the L axis from the positive side to the negative side along the L axis.

In the illustrated embodiment, the magnetically coupled coils 301a, 301b, and 301c are arranged along the X1 axis direction parallel to the L axis direction. That is, in the array coil component 301, the magnetically coupled coils 301a, 301b, and 301c are arranged in this order along the X1 axis direction. The magnetically coupled coil 301b is arranged at a position spaced apart from the magnetically coupled coil 301a in the X1 axis direction. Similarly, the magnetically coupled coil 301c is arranged at a position spaced apart from the magnetically coupled coil 301b in the X1 axis direction.

In the illustrated embodiment, the magnetically coupled coil 301a includes a first coil conductor 325 and a second coil conductor 335. The first coil conductor 325 faces the upper surface 310a of the base 310, and the second coil conductor 335 faces the lower surface 310b of the base 310. As shown in FIG. 10, in a plan view (from a viewpoint seen in the direction of the T-axis), the first coil conductor 325 has the same shape as the first coil conductor 25 described above, and the second coil conductor 335 has the same shape as the second coil conductor 35 described above. The distance between the first coil conductor 325 and the upper surface 310a of the base 310 may be greater than the distance between the second coil conductor 335 and the lower surface 310b of the base 310, or these distances may be equal to each other.

Although not shown in the figure, two external electrodes connected to both ends of the first coil conductor 325 of the magnetically coupled coil 301a and two external electrodes connected to both ends of the second coil conductor 335 are provided on the lower surface 310b of the base 310.

In the illustrated embodiment, the first coil conductor 325 has a first winding portion 325a extending in the circumferential direction around the coil axis Ax31, a first one-end lead portion 325b connecting one end of the first winding portion 325a to a first external electrode (not shown), and a first other-end lead portion 325c connecting the other end of the first winding portion 325a to a second external electrode (not shown). The second coil conductor 335 has a second winding portion 335a extending in the circumferential direction around the coil axis Ax31, a second one-end lead portion 335b connecting one end of the second winding portion 335a to a third external electrode (not shown), and a second other-end lead portion 335c connecting the other end of the second winding portion 335a to a fourth external electrode (not shown).

With the array coil component 301, multiple magnetically coupled coils are packaged as a single element, making it possible to reduce the mounting space required for multiple magnetically coupled coils.

In the illustrated embodiment, the magnetically coupled coil 301a is configured so that the dimension in the W-axis direction is larger than the dimension in the L-axis direction. For example, the first winding portion 325a of the magnetically coupled coil 301a extends along an elliptical closed loop orbit CL1, and the major axis direction of this closed loop orbit CL1 can be parallel to the W-axis direction. The magnetically coupled coils 301b and 301c may also be configured so that the dimension in the W-axis direction is larger than the dimension in the L-axis direction, similar to the magnetically coupled coil 301a. With this configuration, the dimension in the L-axis direction of the arrayed coil component 301 can be reduced.

5. Fifth embodiment (array type coil component 401)
4-1 Background In an array-type coil component, multiple coils are packaged as a single element, which generally has the advantage that the mounting space required when mounting multiple coils on a substrate can be reduced.

However, in an array-type coil component in which multiple magnetically coupled coil components are packaged, if the distance between adjacent magnetically coupled coil components becomes short, undesirable magnetic coupling between the adjacent magnetically coupled coil components may become large, and each of the magnetically coupled coil components may not be able to exhibit the desired characteristics.

For this reason, in conventional array-type coil components, the spacing between adjacent magnetically coupled coil components is large in order to weaken the magnetic coupling between the adjacent magnetically coupled coil components. However, increasing the spacing between adjacent magnetically coupled coil components goes against the original purpose of array-type coil components, which is to reduce the mounting space.

Therefore, in an array-type coil component having multiple magnetically coupled coil components, it is desirable to reduce the magnetic coupling between adjacent magnetically coupled coil components.

Below, an array type coil component 401 that solves or alleviates the above problems will be described with reference to FIG. 11. FIG. 11 shows a transparent view of an array type coil component 401 according to a fifth embodiment as viewed from the top. The array type coil component 401 includes three magnetically coupled coils 401a, 401b, and 401c. The number of magnetically coupled coil components included in the array type coil component 401 is not limited to three, and may be two, or four or more.

The array coil component 401 includes a base 410, on which the coil conductors constituting the magnetically coupled coils 401a, 401b, and 401c are provided. The base 410, like the base 10, is made of an insulating material and electrically insulates the coil conductors constituting the magnetically coupled coils 401a, 401b, and 401c from each other.

The base 410 has an upper surface, a lower surface, a first end surface 410c, a second end surface 410d, a first side surface 410e, and a second side surface 410f. The base 410 is configured similarly to the base 310. The above explanations regarding the bases 10 and 310 also apply to the base 410 as far as possible. For ease of explanation, FIG. 11 shows an X1 axis that extends parallel to the L axis along the L axis direction from the positive side to the negative side of the L axis.

In the illustrated embodiment, the magnetically coupled coils 401a, 401b, and 401c are arranged along the X1-axis direction, which is parallel to the L-axis direction. That is, in the array coil component 401, the magnetically coupled coils 401a, 401b, and 401c are arranged in this order along the X1-axis direction. The magnetically coupled coil 401b is arranged at a position spaced apart from the magnetically coupled coil 401a in the X1-axis direction. Similarly, the magnetically coupled coil 401c is arranged at a position spaced apart from the magnetically coupled coil 401b in the X1-axis direction.

In the illustrated embodiment, the magnetically coupled coil 401a includes a first coil conductor 425 and a second coil conductor 435. The first coil conductor 425 faces the upper surface of the base 410, and the second coil conductor 435 is disposed to face the lower surface of the base 410. The distance between the first coil conductor 425 and the upper surface of the base 410 may be greater than the distance between the second coil conductor 435 and the lower surface of the base 410, or these distances may be equal to each other.

Although not shown in the figure, two external electrodes connected to both ends of the first coil conductor 425 of the magnetically coupled coil 401a and two external electrodes connected to both ends of the second coil conductor 435 are provided on the underside of the base 410.

In the illustrated embodiment, the first coil conductor 425 has a first winding portion 425a extending in the circumferential direction around the coil axis Ax41, a first one-end lead portion 425b connecting one end of the first winding portion 425a to a first external electrode (not shown), and a first other-end lead portion 425c connecting the other end of the first winding portion 425a to a second external electrode (not shown). The second coil conductor 435 has a second winding portion 435a extending in the circumferential direction around the coil axis Ax41, a second one-end lead portion 435b connecting one end of the second winding portion 435a to a third external electrode (not shown), and a second other-end lead portion 435c connecting the other end of the second winding portion 435a to a fourth external electrode (not shown).

In one aspect, the first coil conductor 425 is constructed and arranged such that one end and the other end of the first winding portion 425a are spaced apart from each other in the W-axis direction. In the illustrated embodiment, one end of the first winding portion 425a is arranged at a position displaced in the W-axis direction from the other end of the first winding portion 425a. A part of the first winding portion 425a deviates from the closed loop orbit CL1 surrounding the coil axis Ax41 and extends along the X1-axis direction toward the first one-end lead-out portion 425b, and another part of the first winding portion 425a deviates from the closed loop orbit CL1 surrounding the coil axis Ax41 and extends in the X1-axis direction toward the first other-end lead-out portion 425c. Therefore, the portion extending along the X1-axis direction occupies a large proportion of the first winding portion 425a. More specifically, the first winding portion 425a extends along the X1-axis direction in the section between its one end (the portion connected to the first one-end lead-out portion 425b) and the position where it joins the closed loop trajectory CL1, and in the section between its other end (the portion connected to the first other-end lead-out portion 425c) and the position where it joins the closed loop trajectory CL1. Therefore, the magnetic flux generated by the change in the current flowing through the first coil conductor 425 tends to flow in a direction perpendicular to the X1-axis.

Similar to the first coil conductor 425, the second coil conductor 435 is constructed and arranged such that one end and the other end of the second winding portion 435a are spaced apart from each other in the W-axis direction. Therefore, the magnetic flux generated by the change in the current flowing through the second coil conductor 435 also tends to flow in a direction perpendicular to the X1 axis.

As described above, the magnetically coupled coil 401a and the magnetically coupled coil 401b are arranged along the X1-axis direction, while the first coil conductor 425 and the second coil conductor 435 are configured and arranged so that the magnetic flux generated from the first coil conductor 425 and the second coil conductor 435 of the magnetically coupled coil 401a tends to flow in a direction perpendicular to the X1-axis direction. Therefore, the magnetic flux generated from the first coil conductor 425 and the second coil conductor 435 of the magnetically coupled coil 401a is unlikely to interlink with the magnetically coupled coil 401b adjacent to the magnetically coupled coil 401a in the X1-axis direction, so that undesirable magnetic coupling between the magnetically coupled coil 401a and the magnetically coupled coil 401b can be suppressed.

In the illustrated embodiment, the magnetically coupled coil 401b includes a first coil conductor 425 and a second coil conductor 435, similar to the magnetically coupled coil 401a. The first winding portion 425a of the first coil conductor 425 included in the magnetically coupled coil 401b extends along the circumferential direction around the coil axis Ax42. Similarly, the second winding portion 435a of the second coil conductor 435 included in the magnetically coupled coil 401b extends along the circumferential direction around the coil axis Ax42. The coil axis Ax42 is spaced apart from the coil axis Ax41 in the X1-axis direction. Similar to the magnetically coupled coil 401a, the first coil conductor 425 and the second coil conductor 435 included in the magnetically coupled coil 401b are configured and arranged so that the magnetic flux generated from the first coil conductor 425 and the second coil conductor 435 easily flows in a direction perpendicular to the X1-axis direction. Therefore, the magnetic flux generated from the first coil conductor 425 and the second coil conductor 435 of the magnetically coupled coil 401b is unlikely to interlink with the magnetically coupled coil 401a and the magnetically coupled coil 401c adjacent to the magnetically coupled coil 401b, so that undesirable magnetic coupling between the magnetically coupled coil 401b and the magnetically coupled coil 401a and the magnetically coupled coil 401c can be suppressed.

The magnetically coupled coil 401b may have a set of coil conductors having a shape different from that of the magnetically coupled coil 401a. The coil conductors of the magnetically coupled coil 401b are configured and arranged so that the magnetic flux generated from the coil conductors is easily caused to flow in a direction perpendicular to the X1-axis direction.

The magnetically coupled coil 401c includes a first coil conductor 425 and a second coil conductor 435, similar to the magnetically coupled coil 401a. The first winding portion 425a of the first coil conductor 425 included in the magnetically coupled coil 401c extends in the circumferential direction around the coil axis Ax43. Similarly, the second winding portion 435a of the second coil conductor 435 included in the magnetically coupled coil 401c extends in the circumferential direction around the coil axis Ax43. The coil axis Ax43 is spaced apart from the coil axis Ax41 and the coil axis Ax42 in the X1-axis direction. Similar to the magnetically coupled coil 401a, the first coil conductor 425 and the second coil conductor 435 included in the magnetically coupled coil 401c are configured and arranged so that the magnetic flux generated from the first coil conductor 425 and the second coil conductor 435 easily flows in a direction perpendicular to the X1-axis direction. Therefore, the magnetic flux generated from the first coil conductor 425 and the second coil conductor 435 of the magnetically coupled coil 401c is unlikely to interlink with the magnetically coupled coil 401b adjacent to the magnetically coupled coil 401c, so undesirable magnetic coupling between the magnetically coupled coil 401c and the magnetically coupled coil 401b can be suppressed.

The magnetically coupled coil 401c may have a set of coil conductors having a shape different from that of the magnetically coupled coil 401a. The coil conductors of the magnetically coupled coil 401b are configured and arranged so that the magnetic flux generated from the coil conductors is easily caused to flow in a direction perpendicular to the X1 axis direction.

The description of the first coil conductor 25 provided in the magnetically coupled coil component 1 also applies to the first coil conductor 425 as much as possible. In addition, the description of the second coil conductor 35 provided in the magnetically coupled coil component 1 also applies to the second coil conductor 435 as much as possible.

5 Combination of Embodiments The embodiments disclosed in the present specification also include aspects obtained by combining the embodiments described in this specification. In the following description, the first coil conductor 25, the first coil conductor 125, the first coil conductor 325, and the first coil conductor 425 are collectively referred to as the "first coil conductor." In addition, the second coil conductor 35, the second coil conductor 135, the second coil conductor 335, and the second coil conductor 435 are collectively referred to as the "second coil conductor."

The first to fifth embodiments can be combined in various combinations that can be understood by a person skilled in the art based on the description of the present specification. For example, as already described, by combining the first and second embodiments, the degree of coupling between the first and second coil conductors can be increased, and the difference between the inductance value of the first coil conductor and the inductance value of the second coil conductor can be reduced. In addition, by combining the first and fourth embodiments, the coupling between the coil conductors of each of the multiple magnetically coupled coils can be increased, and the mounting area of the multiple magnetically coupled coils can be reduced compared to the case where the multiple magnetically coupled coils are individually chipped. In addition, as an example of a combination of other embodiments, by combining the first and fifth embodiments, in an array type coil component having multiple magnetically coupled coils, the coupling between the coil conductors of each of the multiple magnetically coupled coils can be increased, and undesirable magnetic coupling between adjacent magnetically coupled coil components can be suppressed. Furthermore, by combining the second and third embodiments, the width dimension of the first coil conductor is made larger than the width dimension of the second coil conductor, and the thickness dimension of the first coil conductor is made larger than the thickness dimension of the second coil conductor, thereby making it possible to reduce the difference between the inductance value of the first coil conductor and the inductance value of the second coil conductor.

As will be readily understood by those skilled in the art from the description of this specification, it is also possible to combine three or more embodiments. For example, the first embodiment, the second embodiment, and the fifth embodiment can be combined.

The possible combinations of the embodiments are not limited to those specified in this specification. Embodiments 1 to 5 can be combined in any manner.

6 Note The dimensions, materials, and arrangements of each component described in the various embodiments above are not limited to those explicitly described in each embodiment, and each component can be modified to have any dimensions, materials, and arrangements that can be included in the scope of the present invention. For example, in the embodiment shown in Figures 1 to 5, the first lower shaft portion V12 is arranged closer to the coil axis Ax than the first upper shaft portion V11, and the second lower shaft portion V32 is arranged closer to the coil axis Ax than the second upper shaft portion V31, but only one of the first lower shaft portion V12 or the second lower shaft portion V32 may be arranged closer to the coil axis Ax than the corresponding first upper shaft portion V11 or second upper shaft portion V31. Even in this case, a large area for passing magnetic flux can be secured around at least one of the first lead portion 25b1 or the second lead portion 25b2, so that the magnetic characteristics and DC superposition characteristics of the coil component 1 can be improved.

Components not explicitly described in this specification may be added to each of the above-described embodiments, and some of the components described in each embodiment may be omitted.

The designations "first," "second," "third," and the like in this specification are used to identify components and do not necessarily limit the number, order, or content. Furthermore, numbers for identifying components are used in different contexts, and a number used in one context does not necessarily indicate the same configuration in another context. Furthermore, this does not prevent a component identified by a certain number from also serving the function of a component identified by another number.

7 Supplementary Notes The embodiments disclosed in this specification also include the following.

[Appendix 1]
a base made of an insulating material and having a first surface and a second surface opposite to the first surface;
a first coil conductor provided within the base body so as to face the first surface;
a second coil conductor provided within the base body so as to face the second surface;
Equipped with
the first coil conductor has a first winding portion wound around a coil axis, a first one-end drawn-out portion extending from one end of the first winding portion to the second surface, and a first other-end drawn-out portion extending from the other end of the first winding portion to the second surface,
the second coil conductor has a second winding portion wound around the coil axis, a second one-end drawn-out portion extending from one end of the second winding portion to the second surface, and a second other-end drawn-out portion extending from the other end of the second winding portion to the second surface,
a first distance indicating a distance between the first winding portion and the first surface is greater than a second distance indicating a distance between the second winding portion and the second surface;
Coil parts.
[Appendix 2]
the first winding portion extends along a first closed loop orbit for one or more turns in a circumferential direction around the coil axis,
the second winding portion extends along a second closed loop orbit for one or more turns in a circumferential direction around the coil axis,
a dimension of the first winding portion in a direction perpendicular to the coil axis and the first closed loop orbit is larger than a dimension of the second winding portion in a direction perpendicular to the coil axis and the second closed loop orbit;
The coil component described in [Appendix 1].
[Appendix 3]
A first thickness (T11) indicating a thickness in an axial direction along the coil axis of the first winding portion is thicker than a second thickness (T12) indicating a thickness in the axial direction of the second winding portion.
The coil component according to [Appendix 1] or [Appendix 2].
[Appendix 4]
a difference between an inductance value of the first coil conductor and an inductance value of the second coil conductor is 5% or less of the inductance value of the first coil conductor;
A coil component according to any one of [Appendix 1] to [Appendix 3].
[Appendix 5]
a base body made of a magnetic material and having a first surface and a second surface opposite to the first surface;
a first coil conductor provided within the base body so as to face the first surface;
a second coil conductor provided within the base body so as to face the second surface;
Equipped with
the first coil conductor has a first winding portion extending for one or more turns in a circumferential direction around a coil axis along a first closed loop orbit, a first one-end drawn-out portion extending from one end of the first winding portion to the second surface, and a first other-end drawn-out portion extending from the other end of the first winding portion to the second surface,
the second coil conductor has a second winding portion extending for one or more turns in a circumferential direction around the coil axis along a second closed loop orbit, a second one-end drawn-out portion extending from one end of the second winding portion to the second surface, and a second other-end drawn-out portion extending from the other end of the second winding portion to the second surface,
a dimension of the first winding portion in a direction perpendicular to the coil axis and the first closed loop orbit is larger than a dimension of the second winding portion in a direction perpendicular to the coil axis and the second closed loop orbit;
Coil parts.
[Appendix 6]
a base body made of a magnetic material and having a first surface and a second surface opposite to the first surface;
a first coil conductor provided within the base body so as to face the first surface;
a second coil conductor provided within the base body so as to face the second surface;
Equipped with
the first coil conductor has a first winding portion wound around a coil axis, a first one-end drawn-out portion extending from one end of the first winding portion to the second surface, and a first other-end drawn-out portion extending from the other end of the first winding portion to the second surface,
the second coil conductor has a second winding portion wound around the coil axis, a second one-end drawn-out portion extending from one end of the second winding portion to the second surface, and a second other-end drawn-out portion extending from the other end of the second winding portion to the second surface,
a first thickness indicating a thickness of the first winding portion in an axial direction along the coil axis is greater than a second thickness indicating a thickness of the second winding portion in the axial direction;
Coil parts.
[Appendix 7]
the first winding portion is wound around the coil axis by less than two turns,
The second winding portion is wound around the coil axis by less than two turns.
The coil component according to any one of [Appendix 1] to [Appendix 6].
[Appendix 8]
a base body made of an insulating material and having a first surface, a second surface opposite to the first surface, a third surface connecting the first surface and the second surface, and a fourth surface opposite to the third surface and spaced apart from the third surface in a uniaxial direction;
A first magnetically coupled coil provided within the base body;
a second magnetically coupled coil provided within the base body and spaced apart from the first magnetically coupled coil in the one axial direction;
Equipped with
the first magnetically coupled coil has a first coil conductor provided to face the first surface and a second coil conductor provided to face the second surface,
the second magnetically coupled coil has a third coil conductor provided to face the first surface and a fourth coil conductor provided to face the second surface,
the first coil conductor has a first winding portion wound around a first coil axis, a first one-end drawn-out portion extending from one end of the first winding portion to the second surface, and a first other-end drawn-out portion extending from the other end of the first winding portion to the second surface,
the second coil conductor has a second winding portion wound around the first coil axis, a second one-end drawn-out portion extending from one end of the second winding portion to the second surface, and a second other-end drawn-out portion extending from the other end of the second winding portion to the second surface,
the third coil conductor has a third winding portion wound around a second coil axis spaced apart from the first coil axis in the uniaxial direction, a third one-end drawn-out portion extending from one end of the third winding portion to the second surface, and a third other-end drawn-out portion extending from the other end of the third winding portion to the second surface,
the fourth coil conductor has a fourth winding portion wound around the second coil axis, a fourth one-end drawn-out portion extending from one end of the fourth winding portion to the second surface, and a fourth other-end drawn-out portion extending from the other end of the fourth winding portion to the second surface,
The other end of the first winding portion is located at a position spaced apart from the one end of the first winding portion in the uniaxial direction,
The other end of the second winding portion is located at a position spaced apart from the one end of the second winding portion in the uniaxial direction,
The other end of the third winding portion is located at a position spaced apart from one end of the third winding portion in the uniaxial direction,
The other end of the fourth winding portion is located at a position spaced apart from one end of the fourth winding portion in the uniaxial direction.
Array type coil components [Appendix 9]
A circuit board comprising the coil component according to any one of [Appendix 1] to [Appendix 8].
[Appendix 10]
An electronic component comprising the circuit board according to [Appendix 9].

DESCRIPTION OF SYMBOLS 1, 101, 201 Magnetically coupled coil component 10, 310, 410 Base 21 First external electrode 22 Second external electrode 23 Third external electrode 24 Fourth external electrode 25, 125, 325, 425 First coil conductor 25a, 125a, 325a First winding portion 25b, 325b First one end lead portion 25c, 325c First other end lead portion 35, 135, 335, 435 Second coil conductor 35a, 135a, 335a Second winding portion 35b, 335b Second one end lead portion 35c, 335c Second other end lead portion 301, 401 Array type coil component Ax, Ax31, Ax32, Ax33, Ax41, Ax42, Ax43 Coil axis

Claims (10)

a base made of an insulating material and having a first surface and a second surface opposite to the first surface;
a first coil conductor provided within the base body so as to face the first surface;
a second coil conductor provided within the base body so as to face the second surface;
Equipped with
the first coil conductor has a first winding portion wound around a coil axis, a first one-end drawn-out portion extending from one end of the first winding portion to the second surface, and a first other-end drawn-out portion extending from the other end of the first winding portion to the second surface,
the second coil conductor has a second winding portion wound around the coil axis, a second one-end drawn-out portion extending from one end of the second winding portion to the second surface, and a second other-end drawn-out portion extending from the other end of the second winding portion to the second surface,
a first distance indicating a distance between the first winding portion and the first surface is greater than a second distance indicating a distance between the second winding portion and the second surface;
Coil parts. the first winding portion extends along a first closed loop orbit for one or more turns in a circumferential direction around the coil axis,
the second winding portion extends along a second closed loop orbit for one or more turns in a circumferential direction around the coil axis,
a dimension of the first winding portion in a direction perpendicular to the coil axis and the first closed loop orbit is larger than a dimension of the second winding portion in a direction perpendicular to the coil axis and the second closed loop orbit;
The coil component according to claim 1 . a first thickness indicating a thickness of the first winding portion in an axial direction along the coil axis is greater than a second thickness indicating a thickness of the second winding portion in the axial direction;
The coil component according to claim 1 or 2. a difference between an inductance value of the first coil conductor and an inductance value of the second coil conductor is 5% or less of the inductance value of the first coil conductor;
The coil component according to claim 2 . a base body made of a magnetic material and having a first surface and a second surface opposite to the first surface;
a first coil conductor provided within the base body so as to face the first surface;
a second coil conductor provided within the base body so as to face the second surface;
Equipped with
the first coil conductor has a first winding portion extending for one or more turns in a circumferential direction around a coil axis along a first closed loop orbit, a first one-end drawn-out portion extending from one end of the first winding portion to the second surface, and a first other-end drawn-out portion extending from the other end of the first winding portion to the second surface,
the second coil conductor has a second winding portion extending for one or more turns in a circumferential direction around the coil axis along a second closed loop orbit, a second one-end drawn-out portion extending from one end of the second winding portion to the second surface, and a second other-end drawn-out portion extending from the other end of the second winding portion to the second surface,
a dimension of the first winding portion in a direction perpendicular to the coil axis and the first closed loop orbit is larger than a dimension of the second winding portion in a direction perpendicular to the coil axis and the second closed loop orbit;
Coil parts. a base body made of a magnetic material and having a first surface and a second surface opposite to the first surface;
a first coil conductor provided within the base body so as to face the first surface;
a second coil conductor provided within the base body so as to face the second surface;
Equipped with
the first coil conductor has a first winding portion wound around a coil axis, a first one-end drawn-out portion extending from one end of the first winding portion to the second surface, and a first other-end drawn-out portion extending from the other end of the first winding portion to the second surface,
the second coil conductor has a second winding portion wound around the coil axis, a second one-end drawn-out portion extending from one end of the second winding portion to the second surface, and a second other-end drawn-out portion extending from the other end of the second winding portion to the second surface,
a first thickness indicating a thickness of the first winding portion in an axial direction along the coil axis is greater than a second thickness indicating a thickness of the second winding portion in the axial direction;
Coil parts. the first winding portion is wound around the coil axis by less than two turns,
The second winding portion is wound around the coil axis by less than two turns.
The coil component according to claim 1 , 5 , or 6 . a base body made of an insulating material and having a first surface, a second surface opposite to the first surface, a third surface connecting the first surface and the second surface, and a fourth surface opposite to the third surface and spaced apart from the third surface in a uniaxial direction;
A first magnetically coupled coil provided within the base body;
a second magnetically coupled coil provided within the base body and spaced apart from the first magnetically coupled coil in the one axial direction;
Equipped with
the first magnetically coupled coil has a first coil conductor provided to face the first surface and a second coil conductor provided to face the second surface,
the second magnetically coupled coil has a third coil conductor provided to face the first surface and a fourth coil conductor provided to face the second surface,
the first coil conductor has a first winding portion wound around a first coil axis, a first one-end drawn-out portion extending from one end of the first winding portion to the second surface, and a first other-end drawn-out portion extending from the other end of the first winding portion to the second surface,
the second coil conductor has a second winding portion wound around the first coil axis, a second one-end drawn-out portion extending from one end of the second winding portion to the second surface, and a second other-end drawn-out portion extending from the other end of the second winding portion to the second surface,
the third coil conductor has a third winding portion wound around a second coil axis spaced apart from the first coil axis in the uniaxial direction, a third one-end drawn-out portion extending from one end of the third winding portion to the second surface, and a third other-end drawn-out portion extending from the other end of the third winding portion to the second surface,
the fourth coil conductor has a fourth winding portion wound around the second coil axis, a fourth one-end drawn-out portion extending from one end of the fourth winding portion to the second surface, and a fourth other-end drawn-out portion extending from the other end of the fourth winding portion to the second surface,
The other end of the first winding portion is located at a position spaced apart from the one end of the first winding portion in the uniaxial direction,
The other end of the second winding portion is located at a position spaced apart from the one end of the second winding portion in the uniaxial direction,
The other end of the third winding portion is located at a position spaced apart from one end of the third winding portion in the uniaxial direction,
The other end of the fourth winding portion is located at a position spaced apart from one end of the fourth winding portion in the uniaxial direction.
Array type coil parts A circuit board including the coil component according to any one of claims 1, 5, and 6. An electronic component comprising the circuit board according to claim 9.