Coil component

Abstract

A coil component includes: an element body including a pair of end surfaces facing each other; and a coil disposed in the element body. The coil includes at least one coil conductor, and is disposed such that a coil axis is along a direction in which a pair of end surfaces face each other. The element body includes a pair of first element body portions each including a corresponding one of the pair of end surfaces, and a second element body portion located between the pair of first element body portions. The second element body portion includes a first region and a second region provided at different positions in the direction. The second region has a relative permeability smaller than the relative permeability of the first region and a relative permittivity smaller than the relative permittivity of the first region. The at least one coil conductor includes a coil conductor disposed in the second element body portion.

Description

Technical Field

[0001] The present disclosure relates to coil components. Background Art

[0002] A known coil component includes an element body and a coil arranged in the element body (see, for example, Japanese Patent Application Laid-Open No. 8-55726). The element body includes a pair of end faces facing each other. The coil is arranged so that the coil axis is along the direction in which the pair of end faces face each other. Summary of the invention

[0003] An object of one embodiment of the present disclosure is to provide a coil component that has an impedance peak in a high frequency band and suppresses a decrease in inductance.

[0004] One embodiment of the present disclosure provides a coil component, which includes: a body including a pair of end faces opposite to each other; and a coil arranged in the body. The coil includes at least one coil conductor and is arranged in a manner such that the coil axis is along a direction in which the pair of end faces are opposite to each other. The body includes a pair of first body parts each including a corresponding end face in the pair of end faces, and a second body part located between the pair of first body parts. The second body part includes a first region and a second region arranged at different positions in the above-mentioned direction. The second region has a relative magnetic permeability smaller than the relative magnetic permeability of the first region, and a relative dielectric constant smaller than the relative dielectric constant of the first region. The at least one coil conductor includes a coil conductor arranged in the second body part.

[0005] In one of the above-mentioned methods, at least one coil conductor includes a coil conductor arranged in a second body portion, and the second body portion is reliably present at a position where a magnetic flux generated by the coil conductor passes. That is, the second body portion affects the characteristics of the coil component, such as impedance and inductance. The second body portion includes a first region and a second region, and the second region has a relative magnetic permeability smaller than the relative magnetic permeability of the first region, and a relative dielectric constant smaller than the relative dielectric constant of the first region. In one of the above-mentioned methods, a peak of impedance appears in a high frequency band due to the amount of the second body portion including the second region. One of the above-mentioned methods suppresses the reduction of inductance by making the second body portion also include the first region.

[0006] In the above-mentioned aspect, among the three parts obtained by dividing the second element body portion into three equal parts along the direction, the part located in the center may include the second region.

[0007] In the structure in which the central portion includes the second region, the second region in which the impedance peak appears in the high frequency band is arranged in the central portion. Therefore, in this structure, the impedance peak appears reliably in the high frequency band.

[0008] In the above embodiment, the three parts may include the first area and the second area respectively.

[0009] In the structure in which the three parts respectively include the first region and the second region, the second region where the impedance peak appears in the high frequency band is respectively arranged in the three parts. Therefore, the structure makes the impedance peak appear more reliably in the high frequency band.

[0010] In the above-mentioned aspect, the second region may include a plurality of regions respectively provided at different positions in the above-mentioned direction.

[0011] In the structure in which the second region includes the plurality of regions, the plurality of second regions in which impedance peaks appear in the high frequency band are arranged in the second element body portion. Therefore, in this structure, impedance peaks appear more reliably in the high frequency band.

[0012] In the above aspect, the plurality of regions may be provided symmetrically with respect to a central position of the length of the second element body portion in the above direction.

[0013] In the structure where the plurality of regions are symmetrically arranged with respect to the central position, the plurality of second regions where the impedance peak appears in the high frequency band are symmetrically arranged with respect to the central position. Therefore, this structure makes the impedance peak appear more reliably in the high frequency band.

[0014] In the above aspect, the plurality of regions may be arranged at substantially equal intervals in the direction.

[0015] In the structure in which the plurality of regions are arranged at substantially equal intervals in the direction, the plurality of second regions in which impedance peaks appear in the high frequency band are arranged at substantially equal intervals. Therefore, this structure makes impedance peaks appear more reliably in the high frequency band.

[0016] In the above-mentioned aspect, the plurality of regions may be provided so as to be inclined toward one of the pair of first element body portions.

[0017] In the structure in which the plurality of regions are arranged in a manner inclined toward one of the pair of first body parts, even if the element contained in the second region diffuses into the second body part, the element is not easily diffused into the second body part close to the other first body part. The first region of the second body part close to the other first body part is not easily affected by the diffusion of the element. Therefore, this structure reliably suppresses the reduction of inductance.

[0018] In the above-mentioned aspect, the at least one coil conductor may include a plurality of coil conductors. The plurality of coil conductors may include a coil conductor arranged in the second region.

[0019] In a structure where the plurality of coil conductors include a coil conductor disposed in the second region, the plurality of coil conductors can be disposed in the second region. Therefore, the peak of the impedance in the high frequency band is realized by the plurality of coil conductors. As a result, the above-mentioned method can further reliably produce the peak of the impedance in the high frequency band.

[0020] In one of the above-mentioned embodiments, a pair of external electrodes may be included, which are arranged at both ends of the element body in the above-mentioned direction and are electrically connected to the coil. The element body may also include a side surface connecting the pair of end surfaces. Each of the pair of external electrodes may also include an electrode portion located on the side surface. The edge of the electrode portion and the second area may also be connected to each other.

[0021] The structure in which the edge of the electrode portion and the second region are in contact with each other reduces the stray capacitance formed between the coil and the external electrode. Therefore, the above-mentioned one embodiment can more reliably produce the impedance peak in the high frequency band.

[0022] The present disclosure will be more fully understood from the following detailed description and accompanying drawings, which are given by way of illustration only and should not be construed as limiting the present disclosure.

[0023] The further scope of applicability of the present disclosure will become apparent through the following detailed description. However, it should be understood that the detailed description and specific examples, while indicating examples of the present disclosure, are given by way of illustration only, because, based on the detailed description, various variations and modifications within the spirit and scope of the present disclosure will become apparent to those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a perspective view showing a coil component according to one embodiment.

[0025] Figure 2 It is an exploded perspective view showing the coil and the connection portion.

[0026] Figure 3 It is a diagram showing a cross-sectional structure of a coil component according to the present embodiment.

[0027] Figure 4 It is a diagram showing a cross-sectional structure of a coil component according to a first modified example of the present embodiment.

[0028] Figure 5 It is a diagram showing a cross-sectional structure of a coil component according to a second modified example of the present embodiment.

[0029] Figure 6 It is a diagram showing a cross-sectional structure of a coil component according to a third modified example of the present embodiment.

[0030] Figure 7It is a diagram showing a cross-sectional structure of a coil component according to a fourth modified example of the present embodiment.

[0031] Figure 8 It is a diagram showing a cross-sectional structure of a coil component according to a fifth modified example of the present embodiment.

[0032] Fig. 9 It is a diagram showing a cross-sectional structure of a coil component according to a sixth modified example of the present embodiment.

[0033] Fig.10 It is a diagram showing a cross-sectional structure of a coil component according to a seventh modified example of the present embodiment.

[0034] Fig.11 It is a diagram showing a cross-sectional structure of a coil component according to an eighth modified example of the present embodiment.

[0035] Fig.12 It is a diagram showing a cross-sectional structure of a coil component according to a ninth modified example of the present embodiment. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same elements or elements having the same functions are marked with the same reference numerals, and repeated descriptions are omitted.

[0037] Reference Figure 1 to Figure 3 , the structure of the coil component ED1 of this embodiment is described. Figure 1 It is a perspective view showing the coil component according to the present embodiment. Figure 2 It is an exploded perspective view showing the coil and the connection portion. Figure 3 : is a diagram showing a cross-sectional structure of a coil component according to this embodiment. Figure 3 In the figure, hatching indicating cross sections is omitted.

[0038] like Figure 1 to Figure 3 As shown, the coil component ED1 includes an element body 1, a pair of external electrodes 10, and a coil 30. The pair of external electrodes 10 are arranged on the surface of the element body 1. The coil 30 is arranged in the element body 1 and is electrically connected to the pair of external electrodes 10. The coil 30 is arranged so that the coil axis is along the first direction D1.

[0039] The element body 1 is, for example, in the shape of a cuboid. In this specification, the cuboid shape includes the shape of a cuboid whose corners and edges are chamfered, or the shape of a cuboid whose corners and edges are rounded. The element body 1 includes a pair of end faces 1a facing each other, and four side faces 1c connecting the pair of end faces 1a. The surface of the element body 1 includes a pair of end faces 1a and four side faces 1c. The pair of end faces 1a and the four side faces 1c are respectively rectangular. In this specification, the rectangular shape includes, for example, a shape in which each corner is chamfered, or a shape in which each corner is rounded.

[0040] A pair of end faces 1a are opposite to each other in a first direction D1. A pair of side faces 1c among the four side faces 1c are opposite to each other in a second direction D2. Another pair of side faces 1c are opposite to each other in a third direction D3. The four side faces 1c extend along the first direction D1 in a manner connecting the pair of end faces 1a. The first direction D1 intersects with the second direction D2 and intersects with the third direction D3. The second direction D2, for example, intersects with the third direction D3. In the present embodiment, the first direction D1, the second direction D2, and the third direction D3 are orthogonal to each other.

[0041] The length of the element body 1 in the first direction D1 is, for example, 0.4 to 1.6 mm. The length of the element body 1 in the second direction D2 is, for example, 0.2 to 1.0 mm. The length of the element body 1 in the third direction D3 is, for example, 0.2 to 0.8 mm. In the element body 1, for example, the first direction D1 is the long side direction.

[0042] A pair of external electrodes 10 are disposed at both ends of the element body 1. One external electrode 10 is disposed, for example, on one end surface 1a. The other external electrode 10 is disposed, for example, on the other end surface 1a. The pair of external electrodes 10 are separated from each other in the first direction D1. The pair of external electrodes 10 respectively include electrode portions 10c located on four side surfaces 1c.

[0043] Each of the electrode portions 10c is located on four side surfaces 1c. The electrode portion 10c includes an edge 10e. One electrode portion 10c extends from one end surface 1a to the edge 10e on four side surfaces 1c, for example, in a direction toward the other end surface 1a. Another electrode portion 10c extends from the other end surface 1a to the edge 10e on four side surfaces 1c, for example, in a direction toward one end surface 1a. The edge 10e is located on four side surfaces 1c.

[0044] The external electrode 10 includes a conductive material. The conductive material includes, for example, Ag, Pd, Cu, or Al. The conductive material includes, for example, an Ag-Pd alloy, an Ag-Cu alloy, an Ag-Au alloy, or an Ag-Pt alloy. The external electrode 10 includes, for example, a Ni-plated film, a Sn-plated film, a Cu-plated film, or an Au-plated film. The external electrode 10 may have a multilayer structure of these plated films, or may include a Ni-plated film and a Sn-plated film formed on the Ni-plated film. The thickness of the portion of the external electrode 10 located on the end surface 1a is, for example, 5 to 50 μm.

[0045] The coil 30 includes a plurality of coil conductors 31. The coil 30 may also include at least one coil conductor 31. The coil conductors 31 are arranged in such a manner that at least a portion overlaps with each other when viewed from the first direction D1. Each coil conductor 31 is, for example, in a shape in which a portion of a loop is interrupted. Each coil conductor 31 includes a pair of ends. Each coil conductor 31 extends along a ring-shaped track between the pair of ends. Coil conductors 31 adjacent to each other among the plurality of coil conductors 31 are connected to each other at the ends of each coil conductor 31 via a through-hole conductor 38. When viewed from the first direction D1, the above-mentioned coil conductors 31 adjacent to each other overlap with each other at corresponding ends. The coil component ED1 includes a pair of connecting portions 33 arranged at both ends of the coil 30. The pair of connecting portions 33 electrically connects the coil 30 and a pair of external electrodes 10. Figure 1 In FIG. 1 , the double-dashed chain line schematically shows the outline of the outer shape of the coil 30 and the connecting portion 33 .

[0046] like Figure 2 As shown, each of the pair of connection parts 33 includes, for example, a plurality of conductors 33a and one conductor 33b. The conductors 33a adjacent to each other in the plurality of conductors 33a are connected to each other via a through-hole conductor 36. The through-hole conductor 36 electrically connects the conductors 33a adjacent to each other. The conductor 33a is not exposed on the end face 1a, for example. In the case where the conductor 33a is not exposed on the end face 1a, for example, the conductor 33a farthest from the coil 30 in the plurality of conductors 33a is connected to the external electrode 10 via a through-hole conductor 39. The through-hole conductor 39 is, for example, located between the conductor 33a farthest from the coil 30 and the external electrode 10, and electrically connects the conductor 33a farthest from the coil 30 and the external electrode 10 to each other. In the present embodiment, the conductor 33a farthest from the coil 30 may also be exposed on the end face 1a. In the case where the conductor 33a is exposed on the end face 1a, the conductor 33a exposed on the end face 1a is directly connected to the external electrode 10, and each of the pair of connection parts 33 does not include a through-hole conductor 39. The coil component ED1 may include a structure in which one of the pair of connection parts 33 includes a through-hole conductor 39, and the other of the pair of connection parts 33 does not include a through-hole conductor 39. In this structure, one connection part 33 is connected to the external electrode 10 at the through-hole conductor 39. The other connection part 33 is connected to the external electrode 10 at the conductor 33a exposed at the end surface 1a.

[0047] The conductor 33b is located between the coil 30 and the conductor 33a closest to the coil 30 among the plurality of conductors 33a. The conductor 33b electrically connects the plurality of conductors 33a and the coil 30. The conductor 33b includes, for example, one end connected to the conductor 33a and the other end connected to the coil 30. One end of the conductor 33b is connected to the conductor 33a via a through-hole conductor 36. The other end of the conductor 33b is connected to the coil 30 via a through-hole conductor 37. The coil conductor 31 closest to the end surface 1a among the plurality of coil conductors 31 included in the coil 30 is connected to the conductor 33b via a through-hole conductor 37. Figure 2 In the figure, illustration of some conductors among the plurality of conductors 33a and the through-hole conductors 36 is omitted.

[0048] The coil 30 and the connection portion 33 include a conductive material. The conductive material includes, for example, Ag, Pd, Au, Cu, or Al. The conductive material includes, for example, an Ag-Pd alloy, an Ag-Cu alloy, an Ag-Au alloy, or an Ag-Pt alloy. The coil 30 and the connection portion 33 include, for example, the same conductive material as the external electrode 10. The coil 30 and the connection portion 33 may also include a conductive material different from that of the external electrode 10.

[0049] The element body 1 includes a pair of element body parts 3a, 3b and an element body part 3c. The pair of element body parts 3a, 3b respectively include corresponding end faces 1a in a pair of end faces 1a. In the present embodiment, the element body part 3a includes one end face 1a, and the element body part 3b includes the other end face 1a. The element body part 3c is located between the element body part 3a and the element body part 3b in the first direction D1. In the present embodiment, a connecting portion 33 is arranged in the element body part 3a. Another connecting portion 33 is arranged in the element body part 3b. The coil 30 is arranged in the element body part 3c. Figure 3 In the figure, the through-hole conductor 36 is omitted.

[0050] For example, when the element body portion 3a includes the first element body portion, the element body portion 3c includes the second element body portion. For example, when the element body portion 3b includes the first element body portion, the element body portion 3c includes the second element body portion.

[0051] The element body 1 includes, for example, a plurality of insulating layers having electrical insulation properties. In the present embodiment, the element body 1 includes a plurality of insulating layers stacked in a first direction D1. The plurality of insulating layers are integrated to such an extent that the boundaries between them are actually indistinguishable. Each of the plurality of insulating layers is, for example, rectangular when viewed from the first direction D1. In the present embodiment, the plurality of coil conductors 31 and the conductors 33a and 33b are respectively arranged between adjacent insulating layers among the plurality of insulating layers.

[0052] The boundaries between the element body parts 3a, 3b and the element body part 3c may also be defined as follows.

[0053] For example, the plane defining the boundary between the element body portion 3a and the element body portion 3c is parallel to one end face 1a, the plane includes the coil conductor 31 closest to the one end face 1a, and is in contact with the surface opposite to the one end face 1a. For example, the plane defining the boundary between the element body portion 3b and the element body portion 3c is parallel to the other end face 1a, the plane includes the coil conductor 31 closest to the other end face 1a, and is in contact with the surface opposite to the other end face 1a.

[0054] The element body portion 3c includes a plurality of regions 5a and a plurality of regions 5b. In the present embodiment, the element body portion 3c includes, for example, four regions 5a and four regions 5b. The four regions 5a and the four regions 5b are arranged at mutually different positions in the first direction D1. The regions 5a and 5b are arranged alternately in the first direction D1, for example. The regions 5a and 5b each include an insulator layer. For example, when the region 5a includes the first region, the region 5b includes the second region.

[0055] The four regions 5b are arranged at intervals L1, L2, and L3 from each other in the direction from the element body portion 3a to the element body portion 3b in the first direction D1. That is, the two regions 5b close to the element body portion 3a are separated from each other by an interval L1 relative to the central position CL1. The two central regions 5b are separated from each other by an interval L2. The two regions 5b close to the element body portion 3b are separated by an interval L3 relative to the central position CL1. In this embodiment, the intervals L1, L2, and L3 are approximately the same. The four regions 5b are arranged at approximately equal intervals in the first direction D1.

[0056] In this specification, "substantially equally spaced" includes, for example, a case where a plurality of intervals are equal to each other, a case where the difference between a plurality of intervals is within a predetermined range of a slight difference, or a case where the difference between a plurality of intervals is within a manufacturing error. For example, when each of a plurality of intervals L1, L2, and L3 is within a range of ±20% of the average value of the plurality of intervals L1, L2, and L3, a plurality of regions 5b are disposed at substantially equal intervals.

[0057] One edge 10e of the electrode portion 10c and the region 5b are, for example, in contact with each other. In the present embodiment, one edge 10e and the region 5b closest to the element body portion 3a among the plurality of regions 5b are in contact with each other. The region 5b closest to the element body portion 3a is covered by one electrode portion 10c. Another edge 10e and the region 5b closest to the element body portion 3b are in contact with each other. The region 5b closest to the element body portion 3b is covered by another electrode portion 10c. The two central regions 5b are, for example, not in contact with the edge 10e. The two central regions 5b are, for example, exposed from the electrode portion 10c.

[0058] In the element body part 3c, the insulating layer included in the region 5a includes a first material. The first material includes, for example, a ferrite material. The ferrite material included in the first material includes, for example, a Ni-Cu-Zn ferrite material, a Mg-Cu-Zn ferrite material, a Ni-Cu-Zn-Mg ferrite material, or a Ni-Cu ferrite material. The insulating layer included in the region 5b includes a second material. The second material includes, for example, a Ni-Cu-Zn ferrite material, a Mg-Cu-Zn ferrite material, a Ni-Cu-Zn-Mg ferrite material, a Ni-Cu ferrite material, a Cu-Zn ferrite material, a glass material, a forsterite material, a willemite material, an alumina material, a cordierite material, a steatite material or a mullite material, or a material obtained by mixing these materials.

[0059] The second material includes a material having a relative magnetic permeability smaller than the relative magnetic permeability of the first material and a relative dielectric constant smaller than the relative dielectric constant of the first material. Therefore, the second material may include a magnetic material as long as it includes a material having a relative magnetic permeability smaller than the relative magnetic permeability of the first material and a relative dielectric constant smaller than the relative dielectric constant of the first material. The insulating layer arranged in the element body parts 3a and 3b includes the first material, for example.

[0060] The relative magnetic permeability of the first material is, for example, 2 to 1500. The relative magnetic permeability of the second material included in the region 5b is, for example, 1 to 10. In this embodiment, the relative magnetic permeability of the second material included in the region 5b is, for example, 1. The relative dielectric constant of the first material is, for example, 8 to 20. The relative dielectric constant of the second material included in the region 5b is, for example, 3 to 15.

[0061] In the present embodiment, region 5b has a relative magnetic permeability smaller than the relative magnetic permeability of region 5a, and a relative dielectric constant smaller than the relative dielectric constant of region 5a. That is, the relative magnetic permeability of region 5b is smaller than the relative magnetic permeability of region 5a, and the relative dielectric constant of region 5b is smaller than the relative dielectric constant of region 5a.

[0062] The element body portion 3c includes three parts, namely, part 7a, part 7b, and part 7c. Part 7a, part 7b, and part 7c are arranged in the first direction D1, for example, in the order of part 7a, part 7b, and part 7c. Part 7b is located in the center of parts 7a, 7b, and 7c. Part 7a is located near the element body portion 3a. Part 7c is located near the element body portion 3b. Parts 7a, 7b, and 7c, for example, divide the element body portion 3c into three equal parts along the first direction D1.

[0063] In this specification, "three equal parts" include, for example, the case where the lengths of the three parts are equal to each other, the case where the difference in the lengths of the three parts is within a predetermined range of a slight difference, or the case where the difference in the lengths of the three parts is within a manufacturing error. For example, when the lengths of the parts 7a, 7b, 7c in the first direction D1 are within a range of ±20% of the value obtained by averaging the lengths of the parts 7a, 7b, 7c in the first direction D1, the parts 7a, 7b, 7c divide the element body part 3c into three equal parts along the first direction D1.

[0064] For example, the parts 7a, 7b, and 7c include the region 5a and the region 5b, respectively. In the present embodiment, the part 7a includes one region 5a and two regions 5b. The part 7b includes two regions 5a and two regions 5b. The part 7c includes two regions 5a and one region 5b. The parts 7a and 7b adjacent to each other repeatedly include one region 5a and 5b located at the boundary of the parts 7a and 7b. The parts 7b and 7c adjacent to each other repeatedly include one region 5a and 5b located at the boundary of the parts 7b and 7c. In each of the plurality of regions 5b, three insulating layers including the second material are continuously stacked on each other without interposing the region 5a.

[0065] Reference Figure 4 , a coil component ED2 according to a first modified example of the present embodiment will be described. Figure 4 : is a diagram showing a cross-sectional structure of a coil component according to a first modified example of the present embodiment. Figure 4 In FIG. 1 , hatching indicating a cross section and illustration of the via-hole conductor 36 are omitted. The structure of the coil component ED2 is the same as that of the coil component ED1 except for the arrangement of the regions 5a and 5b.

[0066] The element body portion 3c includes 24 regions 5a and 24 regions 5b. The 24 regions 5b are provided at mutually different positions in the first direction D1. Each of the portions 7a, 7b, and 7c includes eight regions 5a and eight regions 5b.

[0067] In the first variant, 24 regions 5b are arranged at approximately equal intervals in the first direction D1. For example, an insulator layer included in the region 5b and an insulator layer included in the region 5a are alternately stacked. One edge 10e and three regions 5b close to the element body portion 3a are in contact with each other. Another edge 10e and two regions 5b close to the element body portion 3b are in contact with each other. For example, regions 5b other than the above five regions 5b are not in contact with the edge 10e, but are exposed from the electrode portion 10c.

[0068] Reference Figure 5 , a coil component ED3 according to a second variation of the present embodiment will be described. Figure 52 is a diagram showing a cross-sectional structure of a coil component according to a second modified example of the present embodiment. Figure 5 In FIG. 1 , hatching indicating a cross section and illustration of the via-hole conductor 36 are omitted. The structure of the coil component ED3 is the same as that of the coil component ED1 except for the arrangement of the regions 5a and 5b.

[0069] The element body portion 3c includes three regions 5a and three regions 5b. The three regions 5b are arranged at different positions in the first direction D1. The portion 7a includes two regions 5a and two regions 5b. The portion 7b includes two regions 5a and one region 5b. The portion 7c includes one region 5a and does not include a region 5b.

[0070] In the second modification, each of the three regions 5b is arranged in a manner that is tilted toward the element body portion 3a. The three regions 5b are arranged near the element body portion 3a relative to the central position CL1. Each of the three regions 5b is arranged to form intervals L1 and L2 from each other in the direction from the element body portion 3a to the element body portion 3b in the first direction D1. For example, the intervals L1 and L2 are substantially the same. The three regions 5b are arranged at substantially equal intervals in the first direction D1. In each of the three regions 5b, three insulating layers containing the second material are continuously stacked on each other without interposing the region 5a.

[0071] One edge 10e and the region 5b closest to the element body 3a of the three regions 5b are in contact with each other. The other edge 10e and the region 5b are not in contact with each other. The two regions 5b close to the element body 3b are not in contact with the edge 10e, but are exposed from the electrode part 10c.

[0072] Reference Figure 6 , a coil component ED4 according to a third modified example of the present embodiment will be described. Figure 6 : is a diagram showing a cross-sectional structure of a coil component according to a third modified example of the present embodiment. Figure 6 In FIG. 1 , hatching indicating a cross section and illustration of the via-hole conductor 36 are omitted. The structure of the coil component ED4 is the same as that of the coil component ED1 except for the arrangement of the regions 5a and 5b.

[0073] The element body portion 3c includes five regions 5a and four regions 5b. The four regions 5b are arranged at different positions in the first direction D1. In the third modified example, the four regions 5b are arranged symmetrically with respect to the central position CL1. The intervals between the two central regions 5b of the four regions 5b and the central position CL1 are the same. The intervals between the two regions 5b at the two ends of the four regions 5b and the central position CL1 are approximately the same. The central position CL1 is located between the two central regions 5b of the four regions 5b.

[0074] exist Figure 6In the example shown, each of the parts 7a and 7c includes one region 5a and does not include the region 5b. The part 7b includes five regions 5a and four regions 5b. In the third modification, each of the parts 7a and 7c may also include the region 5b. For example, each of the parts 7a and 7c may include two regions 5a and one region 5b, and the part 7b may include three regions 5a and two regions 5b. For example, each of the parts 7a and 7c may include three regions 5a and two regions 5b, and the part 7b may include one region 5a and does not include the region 5b.

[0075] The four regions 5b are arranged at intervals L1, L2, and L3 from each other in the first direction D1 from the element body portion 3a toward the element body portion 3b. In the third modification, the intervals L1, L2, and L3 are substantially the same. The four regions 5b are arranged at substantially equal intervals in the first direction D1.

[0076] In each of the four regions 5b, one insulator layer containing the second material is continuously stacked. The edge 10e and the region 5b are not in contact with each other. That is, the four regions 5b are not in contact with the edge 10e, but are exposed from the electrode portion 10c.

[0077] Reference Figure 7 , a coil component ED5 according to a fourth modified example of the present embodiment will be described. Figure 7 : is a diagram showing a cross-sectional structure of a coil component according to a fourth modified example of the present embodiment. Figure 7 In FIG. 1 , hatching indicating a cross section and illustration of the via-hole conductor 36 are omitted. The structure of the coil component ED5 is the same as that of the coil component ED1 except for the arrangement of the regions 5a and 5b.

[0078] The element body portion 3c includes four regions 5a and five regions 5b. The five regions 5b are arranged at different positions in the first direction D1. The portion 7a includes two regions 5a and two regions 5b. The portion 7b includes three regions 5a and two regions 5b. The portion 7c includes two regions 5a and one region 5b.

[0079] In the fourth modification, the five regions 5b are not symmetrically arranged with respect to the central position CL1. The five regions 5b are arranged with intervals L1, L2, L3, and L4 from each other in the direction from the element body portion 3a toward the element body portion 3b in the first direction D1. In the fourth modification, the intervals L1, L2, L3, and L4 are different from each other. For example, the interval L4 is the largest, and the interval L2 is the second largest. The interval L3 is the third largest, and the interval L1 is the smallest.

[0080] In each of the five regions 5 b , three insulating layers containing the second material are continuously stacked on one another without sandwiching the region 5 a .

[0081] In the fourth modification, one edge 10e and the region 5b closest to the element body portion 3a among the five regions 5b are in contact with each other. Another edge 10e and the region 5b closest to the element body portion 3b are in contact with each other. For example, the three regions 5b located second to fourth from the element body portion 3a are not in contact with the edge 10e, but are exposed from the electrode portion 10c.

[0082] Reference Figure 8 , a coil component ED6 according to a fifth modified example of the present embodiment will be described. Figure 8 : is a diagram showing a cross-sectional structure of a coil component according to a fifth modified example of the present embodiment. Figure 8 In FIG. 1 , hatching indicating a cross section and illustration of the via-hole conductor 36 are omitted. The structure of the coil component ED6 is the same as that of the coil component ED1 except for the arrangement of the regions 5a and 5b.

[0083] The element body portion 3c includes five regions 5a and four regions 5b. The four regions 5b are arranged at different positions in the first direction D1. The portion 7a includes two regions 5a and two regions 5b. The portion 7b includes two regions 5a and two regions 5b. The portion 7c includes two regions 5a and one region 5b.

[0084] In the fifth modification, the four regions 5b are not symmetrically arranged with respect to the central position CL1. The four regions 5b are arranged in a manner that is tilted toward the element body portion 3a. In each of the four regions 5b, four insulating layers containing the second material are continuously stacked on each other without separating the regions 5a. Each of the four regions 5b is arranged to form intervals L1, L2, and L3 from each other in the direction from the element body portion 3a toward the element body portion 3b in the first direction D1. For example, the intervals L1, L2, and L3 are approximately the same as each other. The four regions 5b are arranged at approximately equal intervals in the first direction D1.

[0085] One edge 10e and a portion of the region 5b closest to the element body portion 3a among the four regions 5b are in contact with each other. A portion of the region 5b closest to the element body portion 3a is covered by an electrode portion 10c. One edge 10e and another portion of the region 5b closest to the element body portion 3a are not in contact with each other. Another portion of the region 5b closest to the element body portion 3a is not covered by an electrode portion 10c. Another edge 10e and the region 5b are not in contact with each other. The three regions 5b close to the element body portion 3b are not in contact with the edge 10e, but are exposed from the electrode portion 10c.

[0086] Reference Fig. 9 , a coil component ED7 according to a sixth variation of the present embodiment will be described. Fig. 9 : is a diagram showing a cross-sectional structure of a coil component according to a sixth modified example of the present embodiment. Fig. 9In FIG. 1 , hatching indicating a cross section and illustration of the via-hole conductor 36 are omitted. The structure of the coil component ED7 is the same as that of the coil component ED1 except for the arrangement of the regions 5a and 5b.

[0087] The element body portion 3c includes two regions 5a and two regions 5b. The two regions 5b are arranged at different positions in the first direction D1. The portion 7a includes one region 5a and one region 5b. The portion 7b includes two regions 5a and one region 5b. The portion 7c includes one region 5a and does not include a region 5b.

[0088] In the sixth modification, the two regions 5b are not symmetrically arranged with respect to the center position CL1. The two regions 5b are arranged so as to be inclined toward the element body portion 3a. In each of the two regions 5b, three insulating layers containing the second material are continuously stacked without sandwiching the region 5a.

[0089] One edge 10e and the region 5b close to the element body 3a of the two regions 5b are in contact with each other. The region 5b close to the element body 3a is covered by one electrode portion 10c. The region 5b close to the element body 3b is not in contact with the edge 10e, but is exposed from the electrode portion 10c.

[0090] Reference Fig.10 , a coil component ED8 according to a seventh variation of the present embodiment will be described. Fig.10 : is a diagram showing a cross-sectional structure of a coil component according to a seventh variation of the present embodiment. Fig.10 In FIG. 1 , hatching indicating a cross section and illustration of the via-hole conductor 36 are omitted. The structure of the coil component ED8 is the same as that of the coil component ED1 except for the arrangement of the regions 5a and 5b.

[0091] The element body portion 3c includes two regions 5a and two regions 5b. The two regions 5b are provided at different positions in the first direction D1. The portion 7a includes two regions 5a and two regions 5b. Each of the portions 7b and 7c includes one region 5a and no region 5b.

[0092] In the seventh modification, the two regions 5b are not symmetrically arranged with respect to the center position CL1. The two regions 5b are arranged so as to be inclined toward the element body portion 3a. In each of the two regions 5b, two insulating layers containing the second material are continuously stacked on each other without sandwiching the region 5a.

[0093] One edge 10e and the region 5b closest to the element body portion 3a of the two regions 5b are in contact with each other. One edge 10e and a portion of the region 5b located second from the element body portion 3a are in contact with each other. The region 5b closest to the element body portion 3a and a portion of the region 5b located second from the element body portion 3a are covered by an electrode portion 10c. One edge 10e and another portion of the region 5b located second from the element body portion 3a are not in contact with each other. Another portion of the region 5b located second from the element body portion 3a is exposed from an electrode portion 10c. The other edge 10e is also not in contact with any region 5b. The other edge 10e does not cover any region 5b.

[0094] Reference Fig.11 , the coil component ED9 according to the eighth modified example of the present embodiment is described. Fig.11 : is a diagram showing a cross-sectional structure of a coil component according to an eighth variation of the present embodiment. Fig.11 In FIG. 1 , hatching indicating a cross section and illustration of the via-hole conductor 36 are omitted. The structure of the coil component ED9 is the same as that of the coil component ED1 except for the arrangement of the regions 5a and 5b.

[0095] The element body portion 3c includes two regions 5a and one region 5b. Each of the portions 7a and 7c includes one region 5a and does not include a region 5b. The portion 7b includes two regions 5a and one region 5b. In one region 5b, three insulating layers containing the second material are continuously stacked on each other without interposing the region 5a. One region 5b is not in contact with the edge 10e, but is exposed from the electrode portion 10c.

[0096] Reference Fig.12 , a coil component ED10 according to a ninth modification example of the present embodiment will be described. Fig.12 : is a diagram showing a cross-sectional structure of a coil component according to a ninth variation of the present embodiment. Fig.12 , hatching indicating a cross section and illustration of the through-hole conductor 36 are omitted. The structure of the coil component ED10 is the same as that of the coil component ED1 except for the size of the element parts 3a, 3b, 3c, the structure of the coil 30, and the arrangement of the regions 5a, 5b.

[0097] The element body parts 3a and 3b are respectively longer in the first direction D1 than the element body parts 3a and 3b of the present embodiment. The number of coil conductors 31 included in the coil 30 of the ninth modification is smaller than the number of coil conductors 31 included in the coil 30 of the present embodiment. The element body part 3c includes a region 5b. The region 5b is not in contact with the edge 10e, but is exposed from the electrode part 10c.

[0098] As described above, in the coil components ED1 to ED10, at least one coil conductor 31 includes the coil conductor 31 arranged in the element part 3c, and the element part 3c is reliably present at a position where the magnetic flux generated by the coil conductor 31 passes. That is, the element part 3c affects the characteristics of the coil component, such as impedance and inductance. The element part 3c includes the region 5a and the region 5b, and the region 5b has a relative magnetic permeability smaller than the relative magnetic permeability of the region 5a and a relative dielectric constant smaller than the relative dielectric constant of the region 5a. In the coil components ED1 to ED10, the impedance peak of the element part 3c including the region 5b appears in the high frequency band. By making the element part 3c also include the region 5a, the coil components ED1 to ED10 suppress the reduction of inductance.

[0099] The coil components ED1 to ED10 realize high impedance in a high frequency band of, for example, 700 MHz to 3 GHz.

[0100] In the coil components ED1 to ED7 , ED9 , and ED10 , of the three parts 7 a , 7 b , and 7 c obtained by dividing the element body part 3 b into three equal parts along the first direction D1 , the part 7 b located in the center includes the region 5 b .

[0101] In the coil components ED1 to ED7, ED9, and ED10, the region 5b where the impedance peak appears in the high frequency band is arranged in the portion 7b. Therefore, the coil components ED1 to ED7, ED9, and ED10 reliably appear the impedance peak in the high frequency band.

[0102] In the coil components ED1 , ED2 , ED5 , ED6 , each of the three parts 7 a , 7 b , 7 c includes a region 5 a and a region 5 b .

[0103] In the coil components ED1, ED2, ED5, and ED6, the region 5b where the impedance peak appears in the high frequency band is arranged in each of the three parts 7a, 7b, and 7c. Therefore, the coil components ED1, ED2, ED5, and ED6 more reliably appear the impedance peak in the high frequency band.

[0104] In the coil components ED1 to ED8 , the element portion 3 c includes a plurality of regions 5 b provided at positions different from each other in the first direction D1 .

[0105] In the coil components ED1 to ED8, a plurality of regions 5b where impedance peaks appear in the high frequency band are arranged in the element body portion 3c. Therefore, the coil components ED1 to ED8 can more reliably appear impedance peaks in the high frequency band.

[0106] In the coil component ED4, the plurality of regions 5b are provided symmetrically with respect to the center position CL1 of the element body portion 3c.

[0107] In the coil component ED4, a plurality of regions 5b where impedance peaks appear in the high frequency band are arranged symmetrically with respect to the central position CL1. Therefore, the coil component ED4 more reliably appears impedance peaks in the high frequency band.

[0108] In the coil components ED1 to ED4 and ED6 , the plurality of regions 5 b are provided at substantially equal intervals in the first direction D1 .

[0109] In the coil components ED1 to ED4 and ED6, a plurality of regions 5b where impedance peaks appear in the high frequency band are provided at substantially equal intervals. Therefore, the coil components ED1 to ED4 can more reliably appear impedance peaks in the high frequency band.

[0110] In the coil components ED3 , ED7 , and ED8 , the plurality of regions 5 b are provided so as to be inclined toward one element body portion 3 a of the pair of element body portions 3 a and 3 b .

[0111] In the coil components ED3, ED7, and ED8, even if the element contained in the region 5b diffuses into the element body portion 3c, the element is not easily diffused into the element body portion 3c close to the element body portion 3b. The region 5a provided in the element body portion 3c close to the element body portion 3b is not easily affected by the diffusion of the element. Therefore, the coil components ED3, ED7, and ED8 reliably suppress the reduction of inductance.

[0112] In the coil components ED4 and ED9, the portion 7b includes the region 5a, and the portions 7a and 7c do not include the region 5b. Even if the element included in the region 5b diffuses into the element body portion 3c, the element is not likely to diffuse into the element body portion 3c close to the element body portions 3a and 3b. The element body portion 3c close to the element body portions 3a and 3b is not likely to be affected by the diffusion of the element. Therefore, the coil components ED4 and ED9 reliably suppress the reduction of the inductance.

[0113] In the coil components ED1 to ED10, at least one coil conductor 31 includes a plurality of coil conductors 31. The plurality of coil conductors 31 include the coil conductor 31 arranged in the region 5b.

[0114] In the coil components ED1 to ED10, the plurality of coil conductors 31 can be arranged in the region 5b. Therefore, the peak of impedance in the high frequency band is realized by the plurality of coil conductors 31. As a result, the coil components ED1 to ED10 can more reliably produce the peak of impedance in the high frequency band.

[0115] The coil components ED1 to ED3 and ED5 to ED8 include a pair of external electrodes 10, which are arranged at both ends of the element body 1 in the first direction D1 and are electrically connected to the coil 30. The element body 1 includes a side surface 1c connecting a pair of end surfaces 1a. One external electrode 10 includes an electrode portion 10c located on the side surface 1c. An edge 10e of one electrode portion 10c and an area 5b are in contact with each other. Each of the other external electrodes 10 includes another electrode portion 10c located on the side surface 1c. An edge 10e of another electrode portion 10c and an area 5b are in contact with each other.

[0116] The coil components ED1 to ED3 and ED5 to ED8 reduce the stray capacitance formed between the coil 30 and the external electrode 10. Therefore, the coil components ED1 to ED3 and ED5 to ED8 can more reliably produce an impedance peak in the high frequency band.

[0117] As mentioned above, although embodiment and modification of this disclosure were described, this disclosure is not limited to the said embodiment and modification, Various changes are possible within the range which does not deviate from the summary.

[0118] In the coil component ED1, only the two end portions 7a and 7c of the three portions 7a, 7b, and 7c may include the region 5b. As described above, the structure in which the central portion 7b includes the region 5b reliably produces an impedance peak in the high frequency band.

Claims

1. A coil component, wherein: have: a body including a pair of end faces facing each other; and The coil is disposed in the body. The coil includes at least one coil conductor and is arranged such that the coil axis is along a direction in which the pair of end faces are opposed to each other. The element body includes: a pair of first element body parts each including a corresponding end face of the pair of end faces, and a second element body part located between the pair of first element body parts. The second element body portion includes a first region and a second region which are arranged at different positions in the direction. The second region has a relative magnetic permeability smaller than the relative magnetic permeability of the first region, and a relative dielectric constant smaller than the relative dielectric constant of the first region, The at least one coil conductor includes a coil conductor disposed in the second element body portion.

2. The coil component according to claim 1, wherein Of the three parts obtained by dividing the second element body part into three equal parts along the direction, the part located in the center includes the second region.

3. The coil component according to claim 2, wherein: Each of the three parts includes the first region and the second region.

4. The coil component according to any one of claims 1 to 3, wherein The second region includes a plurality of regions respectively disposed at different positions in the direction.

5. The coil component according to claim 4, wherein The plurality of regions are disposed symmetrically with respect to a central position of a length of the second element body portion in the direction.

6. The coil component according to claim 4 or 5, wherein: The plurality of regions are arranged at substantially equal intervals in the direction.

7. The coil component according to claim 4, wherein: The plurality of regions are disposed in a manner inclined toward one of the pair of first body portions.

8. The coil component according to any one of claims 1 to 7, wherein The at least one coil conductor comprises a plurality of coil conductors, The plurality of coil conductors include the coil conductor disposed in the second region.

9. The coil component according to any one of claims 1 to 8, wherein: A pair of external electrodes are also provided, which are arranged at both ends of the element body in the direction and are electrically connected to the coil. The element body includes a side surface connecting the pair of end surfaces, The pair of external electrodes each include an electrode portion located on the side surface, An edge of the electrode portion and the second region are in contact with each other.

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