Inductor components

Abstract

To provide an inductor component capable of suppressing occurrence of crack caused by a stress residual in the vicinity of a lead-out wire in a manufacturing process.SOLUTION: An inductor component 1A comprises: an element assembly 10; a coil 20 provided in the element assembly 10 and spirally wound in a coil axis direction; a first external electrode 30a electrically connected to one end of the coil 20 and exposed on a surface of the element assembly 10; and a second external electrode 30b electrically connected to the other end of the coil 20 and exposed on the surface of the element assembly 10. The element assembly 10 includes an insulator, and the coil 20 is configured by electrically connecting a plurality of coil wires laminated in the coil axis direction. The plurality of coil wires includes a first coil wire 21a which is electrically connected to the first external electrode 30a via at least one first lead-out wire 22aa. A dimension of each first lead-out wire 22aa in the coil axis direction is smaller than a dimension of the first coil wire 21a in the coil axis direction.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0001] The present invention relates to an inductor component.

Background Art

[0002] Patent Document 1 discloses a method for manufacturing an inductor component, which includes a step of preparing a photosensitive insulating paste and a conductive paste containing a filler material made of quartz, a glass material, and a resin material; a step of applying the insulating paste to form a first insulating layer; a step of exposing the first insulating layer in a state where a first portion of the first insulating layer is shielded from light by a mask; a step of removing the first portion of the first insulating layer to form a groove having a groove depth greater than the groove width at a position corresponding to the first portion; a step of applying the conductive paste into the groove to form a coil conductor layer in the groove; and a step of applying the insulating paste on the first insulating layer and on the coil conductor layer to form a second insulating layer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] According to the method for manufacturing an inductor component described in Patent Document 1, it is said that the aspect ratio and the cross-sectional area of the coil conductor layer can be increased, so that the coil characteristics can be improved.

[0005] However, the inventors have found that when attempting to form an inductor component with a large aspect ratio or cross-sectional area of ​​coil wiring, as described in Patent Document 1, large stresses tend to remain near the lead wires connecting the coil wiring and the external electrodes during firing in the manufacturing process. Therefore, when the aspect ratio or cross-sectional area of ​​the coil wiring is further increased, or when the inductor component is miniaturized, delamination of the interface between the lead wires and the base material (insulating layer) can occur starting from these residual stresses, potentially resulting in crack formation.

[0006] The present invention was made to solve the above-mentioned problems, and aims to provide an inductor component that can suppress the occurrence of cracks caused by residual stress near the lead wiring during the manufacturing process. [Means for solving the problem]

[0007] In a first embodiment, the inductor component of the present invention comprises a base body, a coil provided inside the base body and wound spirally along the coil axis direction, a first external electrode electrically connected to one end of the coil and exposed on the surface of the base body, and a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, wherein the base body includes an insulator, the coil is made up of a plurality of coil wirings stacked in the coil axis direction and electrically connected, the plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead wiring, and the dimension of each of the first lead wirings in the coil axis direction is smaller than the dimension of the first coil wiring in the coil axis direction.

[0008] In a second embodiment, the inductor component of the present invention comprises a base body, a coil provided inside the base body and wound spirally along the coil axis direction, a first external electrode electrically connected to one end of the coil and exposed on the surface of the base body, and a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, wherein the base body includes an insulator, the coil is made up of a plurality of coil wirings stacked in the coil axis direction and electrically connected, the plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead wiring, and when viewed from a longitudinal direction perpendicular to the coil axis direction, both ends of the first lead wiring and both ends of the first external electrode are offset from each other in the coil axis direction.

[0009] In a third embodiment, the inductor component of the present invention comprises a base body, a coil provided inside the base body and wound spirally along the coil axis direction, a first external electrode electrically connected to one end of the coil and exposed on the surface of the base body, and a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, wherein the base body includes an insulator, the surface of the base body includes a bottom surface perpendicular to the coil axis direction and a top surface opposite the bottom surface in the coil axis direction, the first external electrode and the second external electrode are each exposed so as to be separated from each other at least on the bottom surface of the base body, and the coil comprises a plurality of coils stacked in the coil axis direction The coil wiring is electrically connected, and the plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead wiring, and a second coil wiring electrically connected to the second external electrode via at least one second lead wiring, wherein the first lead wiring is located on the top surface side of the body than the second lead wiring in the coil axis direction, and when viewed from the length direction perpendicular to the coil axis direction, the minimum distance between the end of the first lead wiring and the end of the first external electrode is greater than the minimum distance between the end of the second lead wiring and the end of the second external electrode in the coil axis direction and the width direction perpendicular to the length direction.

[0010] In the inductor component of the present invention, when viewed from the direction of the coil axis, the wiring that extends toward the external electrode while being inclined relative to the straight portion of the coil wiring in the path where the coil wiring connects to the external electrode is defined as the lead wiring. In this case, when viewed from the direction of the coil axis, the coil wiring and the lead wiring do not lie on the same straight line with respect to the connection point between them. If, when viewed from the direction of the coil axis, no wiring corresponding to the lead wiring as defined above can be found, then the wiring that does not overlap with the circumference of the coil (extends beyond the circumference of the coil) when viewed from the direction of the coil axis is defined as the lead wiring. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide an inductor component that can suppress the occurrence of cracks caused by residual stress near the lead wiring during the manufacturing process. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a schematic perspective view showing an example of an inductor component according to Embodiment 1 of the present invention. [Figure 2] Figure 2 is a schematic perspective view showing an example of the inductor component shown in Figure 1 in a disassembled state. [Figure 3] Figure 3 is a schematic cross-sectional view showing an example of a cross-section along the line segment a1-a2 of the inductor component shown in Figure 1. [Figure 4] Figure 4 is a schematic perspective view showing an example of an inductor component according to Embodiment 2 of the present invention. [Figure 5] Figure 5 is a schematic cross-sectional view showing an example of a cross-section along the line segment b1-b2 of the inductor component shown in Figure 4. [Figure 6] Figure 6 is a schematic cross-sectional view showing an example of a configuration in which three first lead wires are arranged in the coil axis direction, compared to the configuration shown in Figure 5. [Figure 7] Figure 7 is a schematic cross-sectional view showing an example of a configuration in which four first lead wires are arranged in the coil axis direction, compared to the configuration shown in Figure 6. [Figure 8] Figure 8 is a schematic cross-sectional view showing a modified example of the configuration shown in Figure 5. [Figure 9] Figure 9 is a schematic cross-sectional view showing another modified example of the configuration shown in Figure 5. [Figure 10] Figure 10 is a schematic cross-sectional view showing a modified example of the configuration shown in Figure 6. [Figure 11] Figure 11 is a schematic cross-sectional view showing another modified example of the configuration shown in Figure 6. [Figure 12] Figure 12 is a schematic cross-sectional view showing yet another modified example of the configuration shown in Figure 6. [Figure 13] Figure 13 is a perspective schematic view showing an example of an inductor component according to Embodiment 3 of the present invention. [Figure 14] Figure 14 is a schematic cross-sectional view showing an example of a cross-section along line segment c1 - c2 of the inductor component shown in Figure 13. [Figure 15] Figure 15 is a schematic cross-sectional view showing an example of a cross-section along line segment d1 - d2 of the inductor component shown in Figure 13. [Figure 16] Figure 16 is a perspective schematic view showing an example of an inductor component according to Embodiment 4 of the present invention. [Figure 17] Figure 17 is a schematic cross-sectional view showing an example of a cross-section along line segment e1 - e2 of the inductor component shown in Figure 16. [Figure 18] Figure 18 is a schematic cross-sectional view showing an example of a cross-section along line segment f1 - f2 of the inductor component shown in Figure 16. [Figure 19] Figure 19 is a perspective schematic view showing an example of an inductor component according to Embodiment 5 of the present invention. [Figure 20] Figure 20 is a schematic cross-sectional view showing an example of a cross-section along line segment g1 - g2 of the inductor component shown in Figure 19. [Figure 21] Figure 21 is a perspective schematic view showing an example of an inductor component of a modified example of Embodiment 5 of the present invention. [Figure 22] Figure 22 is a schematic cross-sectional view showing an example of a cross-section along line segment h1 - h2 of the inductor component shown in Figure 21. [Figure 23]Figure 23 is a schematic cross-sectional view showing an example of a cross-section along the line segment j1-j2 of the inductor component shown in Figure 21. [Figure 24] Figure 24 is a schematic perspective view showing an example of an inductor component according to Embodiment 6 of the present invention. [Figure 25] Figure 25 is a schematic perspective view showing an example of an inductor component according to Embodiment 7 of the present invention. [Figure 26] Figure 26 is a schematic cross-sectional view showing an example of a cross-section along the line segment k1-k2 of the inductor component shown in Figure 25. [Figure 27] Figure 27 is a schematic perspective view showing an example of an inductor component according to Embodiment 8 of the present invention. [Figure 28] Figure 28 is a schematic cross-sectional view showing an example of a cross-section along the line segment m1-m2 of the inductor component shown in Figure 27. [Figure 29] Figure 29 is a schematic cross-sectional view showing an example of a cross-section along the line segment n1-n2 of the inductor component shown in Figure 27. [Modes for carrying out the invention]

[0013] The inductor components of the present invention will be described below. However, the present invention is not limited to the configuration described below, and may be modified as appropriate without departing from the spirit of the invention. Furthermore, a combination of several of the preferred configurations described below also constitutes the present invention.

[0014] The embodiments described below are illustrative, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. In Embodiment 2 and subsequent embodiments, descriptions of matters common to Embodiment 1 will be omitted, and the differences will be described primarily. In particular, similar effects and benefits due to similar configurations will not be mentioned sequentially for each embodiment.

[0015] In the following description, unless otherwise specified, each embodiment will simply be referred to as "the inductor component of the present invention."

[0016] The drawings shown below are schematic representations, and their dimensions, aspect ratios, and scales may differ from those of the actual product.

[0017] In this specification, terms describing relationships between elements (e.g., "parallel," "perpendicular," "orthogonal," etc.) and terms describing the shapes of elements mean not only their literal, exact forms, but also a range that is substantially equivalent, for example, a range that includes differences of a few percent.

[0018] In a first embodiment, the inductor component of the present invention comprises a base body, a coil provided inside the base body and wound spirally along the coil axis direction, a first external electrode electrically connected to one end of the coil and exposed on the surface of the base body, and a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, wherein the base body includes an insulator, the coil is made up of a plurality of coil wirings stacked in the coil axis direction and electrically connected, the plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead wiring, and the dimension of each of the first lead wirings in the coil axis direction is smaller than the dimension of the first coil wiring in the coil axis direction.

[0019] [Embodiment 1] An example of a first embodiment of the inductor component of the present invention will be described below as the inductor component of Embodiment 1 of the present invention. In the inductor component of Embodiment 1 of the present invention, the first coil wiring is electrically connected to the first external electrode via one first lead wiring.

[0020] Figure 1 is a schematic perspective view showing an example of an inductor component according to Embodiment 1 of the present invention.

[0021] The inductor component 1A shown in Figure 1 comprises a base body 10, a coil 20, a first external electrode 30a, and a second external electrode 30b.

[0022] In this specification, the length direction, height direction, and width direction are defined by L, T, and W, respectively, as shown in Figure 1, etc. Here, the length direction L, the height direction T, and the width direction W are orthogonal to each other.

[0023] As shown in Figure 1, in the inductor component 1A, the surface of the base body 10 includes end faces 11a and 11b that are in the length direction L, a top surface 12a and a bottom surface 12b that are in the height direction T, and side surfaces 13a and 13b that are in the width direction W. In the inductor component 1A, the width direction W is parallel to the coil axis direction of the coil 20. That is, in the inductor component 1A, the surface of the base body 10 includes a bottom surface 12b that is parallel to the coil axis direction, and a top surface 12a that is in the height direction T which is perpendicular to the coil axis direction and is opposite to the bottom surface 12b.

[0024] In this embodiment, unless otherwise specified, the coil axis direction is parallel to the width direction W.

[0025] In the inductor component 1A, the bottom surface 12b of the base body 10 is the mounting surface. More specifically, the bottom surface 12b of the base body 10 is the mounting surface that faces the mounting target (e.g., a circuit board) when the inductor component 1A is mounted. Therefore, in the inductor component 1A, the mounting surface of the base body 10, that is, the bottom surface 12b of the base body 10, is parallel to the coil axis direction.

[0026] At least one of the surfaces of the base body 10, namely the end face 11a, end face 11b, top face 12a, bottom face 12b, side face 13a, and side face 13b, may be marked to facilitate identification of each face.

[0027] The end faces 11a and 11b of the base body 10 do not need to be strictly perpendicular to the length direction L. Also, the top face 12a and bottom face 12b of the base body 10 do not need to be strictly perpendicular to the height direction T. Furthermore, the side faces 13a and 13b of the base body 10 do not need to be strictly perpendicular to the width direction W.

[0028] As shown in Figure 1, the base body 10 is, for example, a rectangular parallelepiped.

[0029] In this specification, a rectangular parallelepiped shape is sufficient if it is substantially rectangular in shape, and includes, for example, a roughly rectangular parallelepiped shape in which the corners and edges are rounded, as described later.

[0030] It is preferable that the base body 10 has rounded corners and edges. The corners of the base body 10 are the parts where the three faces of the base body 10 intersect. The edges of the base body 10 are the parts where the two faces of the base body 10 intersect.

[0031] Figure 2 is a schematic perspective view showing an example of the inductor component shown in Figure 1 in a disassembled state.

[0032] The base body 10 includes an insulator. In the example shown in Figure 2, the insulator is made up of multiple insulating layers stacked in the direction of the coil axis.

[0033] In the example shown in Figure 2, the multiple insulating layers include insulating layer 15a, insulating layer 15b, insulating layer 15c, insulating layer 15d, insulating layer 15e, insulating layer 15f, and insulating layer 15g. The insulating layers 15a, 15b, 15c, 15d, 15e, 15f, and 15g are stacked sequentially from side surface 13b to side surface 13a of the base body 10 in the direction of the coil axis.

[0034] Furthermore, multiple insulating layers may be integrated, and their boundaries may not be clearly visible.

[0035] Furthermore, the multiple insulating layers may include at least one additional insulating layer in addition to the insulating layers described above. For example, at least one insulating layer may be present between insulating layer 15a and insulating layer 15b in the coil axis direction. Also, at least one insulating layer may be present between insulating layer 15f and insulating layer 15g in the coil axis direction.

[0036] Examples of insulating materials that constitute the insulator (insulating layer) include glass materials mainly composed of borosilicate glass, ceramic materials, organic materials such as epoxy resins, fluororesins, and polymer resins, and composite materials such as glass epoxy resins. Among insulating materials, materials with low dielectric constant and dielectric loss are particularly preferred.

[0037] The insulating materials that make up the multiple insulating layers may be the same as each other, may be different from each other, or may be different in some respects.

[0038] The dimensions of the multiple insulating layers in the coil axis direction may be the same as, different from, or partially different.

[0039] As shown in Figure 1, the coil 20 is located inside the base body 10 and is wound spirally along the coil axis.

[0040] The direction of the coil axis of coil 20 is the direction in which the coil axis CA of coil 20 extends, and as described above, it is parallel to the bottom surface 12b, which is the mounting surface of the base body 10.

[0041] As shown in Figures 1 and 2, the coil 20 is made up of multiple coil wirings stacked in the direction of the coil axis and electrically connected.

[0042] In the examples shown in Figures 1 and 2, the multiple coil wirings include a first coil wiring 21a and a second coil wiring 21b.

[0043] The first coil wiring 21a is located at the outermost position on the side surface 13a of the base body 10 in the coil axis direction, among the multiple coil wirings.

[0044] In the example shown in Figure 2, the first coil wiring 21a is formed by stacking the first coil conductor layer 121aa and the first coil conductor layer 121ab in the direction of the coil axis.

[0045] In the first coil wiring 21a, in addition to the first coil conductor layer described above, at least one other coil conductor layer may be further laminated in the coil axial direction.

[0046] The first coil wiring 21a may have a single-layer structure or a multi-layer structure.

[0047] The second coil wiring 21b is located at the outermost position on the side 13b side of the base body 10 in the coil axis direction, among the multiple coil wirings.

[0048] In the example shown in Figure 2, the second coil wiring 21b is formed by stacking the second coil conductor layer 121ba and the second coil conductor layer 121bb in the direction of the coil axis.

[0049] In the second coil wiring 21b, in addition to the second coil conductor layer described above, at least one other coil conductor layer may be further laminated in the coil axial direction.

[0050] The second coil wiring 21b may have a single-layer structure or a multi-layer structure.

[0051] Furthermore, at least one other coil wiring may exist between the first coil wiring 21a and the second coil wiring 21b in the coil axial direction.

[0052] Examples of conductive materials that make up the coil wiring include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0053] The conductive materials that make up multiple coil wirings may be the same as each other, may be different from each other, or may be different in some parts.

[0054] The dimensions of multiple coil wirings in the coil axis direction may be the same as, different from, or partially different.

[0055] For multiple coil wirings, the dimensions in the direction perpendicular to the direction in which the coil wiring extends, as viewed from the coil axis, that is, the width as viewed from the coil axis, may be the same as each other, may be different from each other, or may be different in some parts.

[0056] Among the multiple coil wirings, adjacent coil wirings in the coil axis direction may be electrically connected via a connecting conductor that penetrates the insulating layer between the adjacent coil wirings in the coil axis direction. In other words, the coil 20 may consist of multiple coil wirings stacked in the coil axis direction and electrically connected via a connecting conductor.

[0057] In the example shown in Figure 2, the first coil wiring 21a and the second coil wiring 21b are electrically connected via a connecting conductor 29a that penetrates the insulating layer 15d in the direction of the coil axis.

[0058] In the example shown in Figure 2, the connecting conductor 29a consists of a connecting conductor layer 129aa.

[0059] In the connecting conductor 29a, at least one other connecting conductor layer may be laminated in addition to the connecting conductor layer 129aa in the direction of the coil axis.

[0060] The connecting conductor 29a may have a single-layer structure or a multi-layer structure.

[0061] Examples of conductive materials that make up the connecting conductor include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0062] As mentioned above, there may be at least one other coil wiring between the first coil wiring 21a and the second coil wiring 21b in the coil axis direction. In other words, the coil 20 may be composed of three or more coil wirings, including the first coil wiring 21a and the second coil wiring 21b plus at least one other coil wiring. However, by adjusting the position of the connecting conductors, it is possible to compose the coil 20 using only the first coil wiring 21a and the second coil wiring 21b.

[0063] When viewed from the direction of the coil axis, the coil 20 may be composed only of straight sections, or only of curved sections, or of both straight and curved sections. For example, when viewed from the direction of the coil axis, the coil 20 may be polygonal, circular, or elliptical.

[0064] As shown in Figure 1, the first external electrode 30a is electrically connected to one end of the coil 20. More specifically, as shown in Figure 1, the first coil wiring 21a constituting the coil 20 is electrically connected to the first external electrode 30a via a first lead wiring 22aa.

[0065] In the example shown in Figure 2, the first lead wiring 22aa consists of the first lead conductor layer 122aa.

[0066] In the first lead wiring 22aa, at least one other lead conductor layer may be laminated in addition to the first lead conductor layer 122aa in the coil axial direction.

[0067] The first lead wiring 22aa may have a single-layer structure or a multi-layer structure.

[0068] As shown in Figure 1, the second external electrode 30b is electrically connected to the other end of the coil 20. More specifically, as shown in Figure 1, the second coil wiring 21b constituting the coil 20 may be electrically connected to the second external electrode 30b via a second lead wiring 22ba.

[0069] In the example shown in Figure 2, the second lead wiring 22ba consists of the second lead conductor layer 122ba.

[0070] In the second lead wiring 22ba, at least one other lead conductor layer may be laminated in addition to the second lead conductor layer 122ba in the coil axial direction.

[0071] The second lead wiring 22ba may have a single-layer structure or a multi-layer structure.

[0072] Examples of conductive materials that make up the lead-out wiring include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0073] The conductive materials constituting the first lead wiring 22aa and the second lead wiring 22ba may be the same or different.

[0074] As shown in Figure 1, the first external electrode 30a is exposed on the surface of the substrate 10.

[0075] As shown in Figure 1, it is preferable that the first external electrode 30a is exposed to at least the bottom surface 12b of the base body 10.

[0076] In the example shown in Figure 1, the first external electrode 30a extends from a portion of the bottom surface 12b of the base body 10 to a portion of the end surface 11a. In other words, in the example shown in Figure 1, the first external electrode 30a is exposed not only on a portion of the bottom surface 12b of the base body 10, but also on a portion of the end surface 11a of the base body 10.

[0077] The first external electrode 30a may be exposed only on the bottom surface 12b of the base body 10.

[0078] In the example shown in Figure 2, the first external electrode 30a is formed by stacking the first external conductor layers 130aa, 130ab, 130ac, 130ad, and 130ae in the direction of the coil axis.

[0079] In the first external electrode 30a, in addition to the first external conductor layer described above, at least one other external conductor layer may be further laminated in the coil axial direction.

[0080] The first external electrode 30a may have a single-layer structure or a multi-layer structure.

[0081] As shown in Figure 1, the second external electrode 30b is exposed on the surface of the substrate 10.

[0082] As shown in Figure 1, it is preferable that the second external electrode 30b is exposed to at least the bottom surface 12b of the base body 10.

[0083] In the example shown in Figure 1, the second external electrode 30b extends from a portion of the bottom surface 12b of the base body 10 to a portion of the end surface 11b. In other words, in the example shown in Figure 1, the second external electrode 30b is exposed not only on a portion of the bottom surface 12b of the base body 10 but also on a portion of the end surface 11b of the base body 10.

[0084] The second external electrode 30b may be exposed only on the bottom surface 12b of the base body 10.

[0085] In the example shown in Figure 2, the second external electrode 30b is formed by stacking the second external conductor layers 130ba, 130bb, 130bc, 130bd, and 130be in the direction of the coil axis.

[0086] In the second external electrode 30b, in addition to the second external conductor layer described above, at least one other external conductor layer may be further laminated in the coil axis direction.

[0087] The second external electrode 30b may have a single-layer structure or a multi-layer structure.

[0088] As described above, it is preferable that the first external electrode 30a and the second external electrode 30b are exposed so as to be separated from each other at least on the bottom surface 12b of the base body 10. In the example shown in Figure 1, the first external electrode 30a and the second external electrode 30b are provided so as to be separated from each other in a direction perpendicular to the coil axis direction (here, the length direction L).

[0089] Furthermore, if the first external electrode 30a and the second external electrode 30b are exposed on the bottom surface 12b of the base body 10, which is the mounting surface, the mountability of the inductor component 1A is improved.

[0090] In the example shown in Figure 1, the dimension of the first external electrode 30a in the coil axis direction is smaller than the dimension of the base body 10 in the coil axis direction.

[0091] The dimensions of the first external electrode 30a in the coil axis direction may be the same as the dimensions of the base body 10 in the coil axis direction.

[0092] In the example shown in Figure 1, the dimension of the second external electrode 30b in the coil axis direction is smaller than the dimension of the base body 10 in the coil axis direction.

[0093] The dimensions of the second external electrode 30b in the coil axis direction may be the same as the dimensions of the base body 10 in the coil axis direction.

[0094] Examples of conductive materials that constitute the external electrodes include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0095] The first external electrode 30a may have, in order from the coil 20 side, a base electrode containing the conductive material described above (for example, Ag), a Ni-plated electrode, and a Sn-plated electrode. In this case, the base electrode of the first external electrode 30a may form a surface integral with the surface of the base body 10 (in Figure 1, the end face 11a and the bottom face 12b of the base body 10), and the Ni-plated electrode and the Sn-plated electrode may protrude from the surface of the base body 10 (in Figure 1, the end face 11a and the bottom face 12b of the base body 10) so as to cover the base electrode.

[0096] The second external electrode 30b may have, in order from the coil 20 side, a base electrode containing the conductive material described above (for example, Ag), a Ni-plated electrode, and a Sn-plated electrode. In this case, the base electrode of the second external electrode 30b may form a surface integral with the surface of the base body 10 (in Figure 1, the end face 11b and the bottom face 12b of the base body 10), and the Ni-plated electrode and the Sn-plated electrode may protrude from the surface of the base body 10 (in Figure 1, the end face 11b and the bottom face 12b of the base body 10) so as to cover the base electrode.

[0097] The conductive materials constituting the first external electrode 30a and the second external electrode 30b may be the same or different.

[0098] Figure 3 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment a1-a2 of the inductor component shown in Figure 1. More specifically, Figure 3 shows a cross-section of the inductor component 1A that includes the boundary between the first coil wiring 21a and the first lead wiring 22aa.

[0099] As shown in Figure 3, the dimension W22aa of the first lead wiring 22aa in the coil axis direction is smaller than the dimension W21a of the first coil wiring 21a in the coil axis direction.

[0100] In inductor component 1A, the dimension W22aa of the first lead wire 22aa in the coil axis direction is smaller than the dimension W21a of the first coil wire 21a in the coil axis direction, thereby suppressing residual stress near the first lead wire 22aa during firing in the manufacturing process. As a result, in inductor component 1A, delamination at the interface between the first lead wire 22aa and the base body 10 caused by residual stress near the first lead wire 22aa is suppressed, and consequently, crack occurrence is suppressed.

[0101] On the other hand, inductor components, particularly the surface of the base body, are subjected to impact loads during the manufacturing process, such as impact loads from abrasive materials during polishing (e.g., barrel polishing) to round the corners and edges of the base body, and chemical erosion loads from the penetration of plating solution during plating to form external electrodes. Therefore, in inductor components, these external loads such as impact loads and chemical erosion loads during the manufacturing process, combined with residual stress near the lead wiring during firing, can easily cause delamination at the interface between the lead wiring and the base body, potentially leading to crack formation. In contrast, in the inductor component 1A, the dimension W22aa of the first lead wire 22aa in the coil axis direction is smaller than the dimension W21a of the first coil wire 21a in the coil axis direction. As a result, residual stress near the first lead wire 22aa during firing in the manufacturing process is suppressed. Therefore, even if external loads such as the aforementioned impact load and chemical erosion load are applied to the inductor component 1A, delamination of the interface between the first lead wire 22aa and the base body 10 triggered by the external load becomes less likely, and consequently, cracks are less likely to occur.

[0102] Based on the above, the inductor component 1A makes it possible to realize an inductor component that can suppress the occurrence of cracks caused by residual stress near the first lead wiring 22aa during the manufacturing process.

[0103] With inductor component 1A, residual stress near the first lead wiring 22aa during firing in the manufacturing process can be suppressed. Therefore, even when attempting to improve coil characteristics by increasing at least one of the aspect ratio and cross-sectional area of ​​the coil wiring (e.g., the first coil wiring 21a), the occurrence of cracks can be suppressed.

[0104] The first lead wire 22aa only needs to have at least a portion where its dimensions in the coil axis direction are smaller than those of the first coil wire 21a. In other words, the first lead wire 22aa may have a portion where its dimensions in the coil axis direction are smaller than those of the first coil wire 21a over a portion of the first lead wire 22aa, or it may have such a portion over the entire first lead wire 22aa, in the direction in which the first lead wire 22aa extends.

[0105] The dimensions of a coiled wiring in the direction of the coil axis are determined as the maximum dimensions in the direction of the coil axis in a cross-section perpendicular to the direction in which the coiled wiring extends. Even if the outer shape of the coiled wiring is uneven when viewed in the above cross-section, the dimensions of the coiled wiring in the direction of the coil axis are determined as the maximum dimensions in the direction of the coil axis including the unevenness.

[0106] The dimensions of the lead-out wiring in the coil axis direction are determined as the maximum dimensions in the coil axis direction in a cross section perpendicular to the direction in which the lead-out wiring extends. Even if the outer shape of the lead-out wiring is uneven when viewed in the above cross section, the dimensions of the lead-out wiring in the coil axis direction are determined as the maximum dimensions in the coil axis direction including the unevenness. Furthermore, if the dimensions of the lead-out wiring in the coil axis direction differ in parts along the direction in which the lead-out wiring extends (for example, see Embodiment 3 described later), the above cross section of the lead-out wiring is determined for each part where the dimensions in the coil axis direction of the lead-out wiring differ.

[0107] As shown in Figure 1, it is preferable that the first coil wiring 21a and the first lead wiring 22aa are connected at the corner D, which corresponds to the point where the first lead wiring 22aa begins to extend at an angle from the straight portion of the first coil wiring 21a when viewed from the direction of the coil axis.

[0108] In the inductor component 1A, the first coil wiring 21a and the first lead wiring 22aa are connected at the corner. This means that the first coil wiring 21a and the first lead wiring 22aa, which has a smaller dimension in the coil axis direction than the first coil wiring 21a, are connected at the corner where stress tends to remain during firing in the manufacturing process. As a result, the stress remaining at the corner is suppressed. Therefore, in the inductor component 1A, even if an external load is applied to the top surface 12a of the base body 10, delamination of the interface between the first lead wiring 22aa and the base body 10 triggered by the external load is suppressed, and consequently, the occurrence of cracks is suppressed.

[0109] In this specification, when viewed from the direction of the coil axis, a wire that extends toward the external electrode while being inclined relative to the straight portion of the coil wiring in the path where the coil wiring connects to the external electrode is defined as a lead wire (for example, the example shown in Figure 1). In this case, when viewed from the direction of the coil axis, the coil wiring and the lead wire are not on the same straight line with respect to the connection point between them. If no wire corresponding to the lead wire as defined above is found when viewed from the direction of the coil axis, a wire that does not overlap the circumference of the coil (extends beyond the circumference of the coil) when viewed from the direction of the coil axis is defined as a lead wire (for example, an example different from Figure 1).

[0110] As shown in Figure 1, in the inductor component 1A, the second coil wiring 21b may be electrically connected to the second external electrode 30b via a second lead wiring 22ba. In this case, as shown in Figure 1, it is preferable that the dimension of the second lead wiring 22ba in the coil axis direction is smaller than the dimension of the second coil wiring 21b in the coil axis direction.

[0111] Another aspect of the second lead wiring 22ba is preferably the same as the aspect of the first lead wiring 22aa described above.

[0112] Inductor component 1A is manufactured, for example, by the following method:

[0113] <Process for creating the mother stack> First, an insulating paste layer, which will later become the insulating layer 15a, is formed by repeatedly applying an insulating paste containing, for example, a glass material mainly composed of borosilicate glass, using screen printing or the like.

[0114] Next, a photosensitive conductive paste layer is formed on the insulating paste layer by coating it with a photosensitive conductive paste, for example, one with Ag as the main metal component, using screen printing or the like. Furthermore, the photosensitive conductive paste layer is irradiated with ultraviolet light or the like via a photomask, and then developed with an alkaline solution or the like to form a coil conductor layer, which will later become the second coil conductor layer 121ba, an outer conductor layer, which will later become the first outer conductor layer 130aa and the second outer conductor layer 130ba, and a lead conductor layer, which will later become the second lead conductor layer 122ba, connected to the coil conductor layer and the outer conductor layer, at multiple locations on the insulating paste layer.

[0115] Furthermore, when forming the coil conductor layer, the lead conductor layer, and the outer conductor layer, instead of exposure using a photomask, for example, DI exposure (also called direct image exposure or direct writing) without a photomask may be performed.

[0116] Next, for example, by coating a photosensitive insulating paste with a screen print or the like, insulating paste layers that will later become insulating layers 15b and 15c are formed on the insulating paste layer that will later become insulating layer 15a. Furthermore, after irradiating the insulating paste layer that will later become insulating layer 15c with ultraviolet light or the like via a photomask, and then developing it with an alkaline solution or the like, via holes and openings are formed in the insulating paste layer that will later become insulating layer 15c. The via holes formed here partially overlap the coil conductor layer that will later become the second coil conductor layer 121ba, but do not overlap the lead conductor layer that will later become the second lead conductor layer 122ba, and have the same shape as the coil conductor layer that will later become the second coil conductor layer 121bb. The openings formed here overlap the outer conductor layers that will later become the first outer conductor layer 130aa and the second outer conductor layer 130ba.

[0117] Furthermore, when forming an insulating paste layer with via holes and openings, instead of exposure using a photomask, for example, DI exposure without a photomask may be performed.

[0118] Next, a new photosensitive conductive paste layer is formed inside the via holes and openings by coating a photosensitive conductive paste, for example, one with Ag as the main metal component, using screen printing or the like, on top of the insulating paste layer which will later become the insulating layer 15c. Furthermore, by irradiating the photosensitive conductive paste layer with ultraviolet light or the like via a photomask and then developing it with an alkaline solution or the like, a coil conductor layer which will later become the second coil conductor layer 121bb is formed inside the via holes, and a connecting conductor layer which will later become the connecting conductor layer 129aa is formed connected to this coil conductor layer. Furthermore, an outer conductor layer which will later become the first outer conductor layer 130ab is formed inside the opening, connected to the outer conductor layer which will later become the first outer conductor layer 130aa, and an outer conductor layer which will later become the first outer conductor layer 130ac is formed on top of this outer conductor layer. Furthermore, an outer conductor layer, which will later become the second outer conductor layer 130bb, is formed inside the opening, connected to the outer conductor layer that will later become the second outer conductor layer 130ba, and an outer conductor layer that will later become the second outer conductor layer 130bc is formed on this outer conductor layer.

[0119] Furthermore, when forming the coil conductor layer, connecting conductor layer, and outer conductor layer, instead of exposure using a photomask, for example, DI exposure without a photomask may be performed.

[0120] Next, for example, by coating a photosensitive insulating paste with a screen print or the like, insulating paste layers that will later become insulating layers 15d and 15e are formed on the insulating paste layer that will later become insulating layer 15c. Furthermore, after irradiating the insulating paste layer that will later become insulating layer 15e with ultraviolet light or the like via a photomask, and then developing it with an alkaline solution or the like, via holes and openings are formed in the insulating paste layer that will later become insulating layer 15e. The via holes formed here overlap with the connecting conductor layer that will later become connecting conductor layer 129aa and have the same shape as the coil conductor layer that will later become the first coil conductor layer 121aa. The openings formed here overlap with the outer conductor layers that will later become the first outer conductor layer 130ac and the second outer conductor layer 130bc.

[0121] Next, a new photosensitive conductive paste layer is formed inside the via holes and openings by coating a photosensitive conductive paste, for example, one with Ag as the main metal component, using screen printing or the like, on top of the insulating paste layer which will later become the insulating layer 15e. Furthermore, by irradiating the photosensitive conductive paste layer with ultraviolet light or the like via a photomask and then developing it with an alkaline solution or the like, a coil conductor layer which will later become the first coil conductor layer 121aa is formed inside the via holes, and a coil conductor layer which will later become the first coil conductor layer 121ab is formed connected to this coil conductor layer. Furthermore, an outer conductor layer which will later become the first outer conductor layer 130ad is formed inside the openings, connected to an outer conductor layer which will later become the first outer conductor layer 130ac, and an outer conductor layer which will later become the first outer conductor layer 130ae is formed on top of this outer conductor layer. Furthermore, an outer conductor layer, which will later become the second outer conductor layer 130bd, is formed inside the opening, connected to the outer conductor layer that will later become the second outer conductor layer 130bc, and an outer conductor layer that will later become the second outer conductor layer 130be is formed on this outer conductor layer. Furthermore, a lead conductor layer, which will later become the first lead conductor layer 122aa, is formed on an insulating paste layer that will later become the insulating layer 15e, connected to the coil conductor layer that will later become the first coil conductor layer 121ab and the outer conductor layer that will later become the first outer conductor layer 130ae.

[0122] Finally, an insulating paste layer, which will later become insulating layer 15f and insulating layer 15g, is formed by repeatedly applying an insulating paste containing, for example, a glass material mainly composed of borosilicate glass, using screen printing or the like.

[0123] Based on the above, the motherboard is fabricated.

[0124] The method for forming the conductor patterns of the coil conductor layer, lead conductor layer, connecting conductor layer, and outer conductor layer is not limited to the photolithography method described above. For example, it may be a method of printing and layering conductive paste using a screen printing plate provided with openings in the shape of the conductor pattern, or a method of forming a conductor film by sputtering, vapor deposition, or foil bonding, and then etching the conductor film to form the shape of the conductor pattern, or a method of forming a negative pattern by a semi-additive method, then forming a plating film, and then removing unnecessary parts of the plating film by etching or the like to form the shape of the conductor pattern.

[0125] When forming the conductor patterns of the coil conductor layer, lead conductor layer, connecting conductor layer, and outer conductor layer, a high aspect ratio can be achieved by forming the conductor patterns in multiple stages, thereby reducing losses due to resistance at high frequencies. The method for forming the conductor patterns in multiple stages is not particularly limited. For example, it may be a method of repeatedly layering conductor patterns by repeating the process using the photolithography method as described above, or a method of repeatedly layering conductor patterns formed by the semi-additive method, or a method of layering conductor patterns formed by the semi-additive method and conductor patterns formed by etching a separately plated film in any order, or a method of further plating and growing a plated film formed by the semi-additive method.

[0126] The conductive material constituting the conductor patterns of the coil conductor layer, lead conductor layer, connecting conductor layer, and outer conductor layer is not limited to the photosensitive conductive paste having Ag or the like as the main metal component, but may also be a conductor containing metals such as Ag, Au, or Cu formed by methods such as sputtering, vapor deposition, foil bonding, or plating.

[0127] The method for forming the insulating paste layer is not limited to the photolithography method described above, but may also be, for example, a method of pressing a sheet made of insulating material, a method of spin-coating the insulating material, or a method of spray-coating the insulating material.

[0128] The method for forming an insulating paste layer with via holes and openings is not limited to the photolithography method described above. For example, an insulating film may be formed by methods such as pressing a sheet made of insulating material, spin-coating an insulating material, or spray-coating an insulating material, and then providing via holes and openings to the insulating film by laser processing, drilling, or the like.

[0129] The insulating material constituting the insulating paste layer is not limited to the glass material mainly composed of borosilicate glass as described above, but may also be, for example, ceramic materials, organic materials such as epoxy resins, fluororesins, and polymer resins, or composite materials such as glass epoxy resins. As the insulating material, materials with low dielectric constant and dielectric loss are particularly preferred.

[0130] <Process for forming the base body, coil, and external electrodes> First, the mother laminate is cut into multiple unfired laminates by dicing or other methods.

[0131] The unfired laminate has an insulating paste laminate section in which insulating paste layers are laminated, a coil conductor laminate section in which coil conductor layers are laminated so that adjacent coil conductor layers are electrically connected via connecting conductor layers, and an external conductor laminate section in which external conductor layers are laminated.

[0132] When separating the unfired laminate into individual pieces, for example, the outer conductor laminate is exposed at two locations on the bottom surface of at least the insulating paste laminate included in the cut surface of the unfired laminate.

[0133] Next, the laminate is produced by firing the unfired laminate.

[0134] When the unfired laminate is fired, the insulating paste layer becomes an insulating layer, and the insulating paste laminate becomes the base body 10. Also, when the unfired laminate is fired, the coil conductor layer becomes a coil wiring, and the coil conductor laminate becomes a coil 20. Furthermore, when the unfired laminate is fired, one of the two external conductor laminates becomes part of the first external electrode 30a, and the other becomes part of the second external electrode 30b.

[0135] Next, the resulting laminate may be subjected to a process such as barrel polishing to round off the corners and edges of the base body 10.

[0136] Finally, using the two fired outer conductor laminates as base electrodes, Ni-plated electrodes and Sn-plated electrodes are sequentially formed on the surface of each base electrode by plating. The thickness of the Ni-plated electrodes and Sn-plated electrodes is, for example, 2 μm or more and 10 μm or less, respectively.

[0137] In this way, a first external electrode 30a and a second external electrode 30b are formed, having a base electrode, a Ni-plated electrode, and a Sn-plated electrode in that order from the surface side of the base body 10. In this case, in the first external electrode 30a, the base electrode forms a surface integral with the surface of the base body 10 (in Figure 1, the end face 11a and the bottom face 12b of the base body 10), and the Ni-plated electrode and the Sn-plated electrode may protrude from the surface of the base body 10 (in Figure 1, the end face 11a and the bottom face 12b of the base body 10) so as to cover the base electrode. In the second external electrode 30b, the base electrode forms a surface integral with the surface of the base body 10 (in Figure 1, the end face 11b and the bottom face 12b of the base body 10), and the Ni-plated electrode and the Sn-plated electrode may protrude from the surface of the base body 10 (in Figure 1, the end face 11b and the bottom face 12b of the base body 10) so as to cover the base electrode.

[0138] The method for forming the external electrode is not limited to the method of applying a plating treatment to the external conductor laminate exposed on the cut surface of the unfired laminate (for example, at least the bottom surface of the insulating paste laminate) as described above. For example, the external conductor laminate may be exposed on the cut surface of the unfired laminate (for example, at least the bottom surface of the insulating paste laminate) as described above, and then the exposed portion of the external conductor laminate may be dipped in conductive paste, or a conductive paste film may be formed on the exposed portion of the external conductor laminate by sputtering, and then a plating treatment may be applied.

[0139] Based on the above, inductor component 1A is manufactured.

[0140] Inductor component 1A is manufactured, for example, in 0402 size (0.4mm x 0.2mm x 0.2mm). However, the size of inductor component 1A is not limited to 0402 size (0.4mm x 0.2mm x 0.2mm).

[0141] [Embodiment 2] In the inductor component of Embodiment 2 of the present invention, the first coil wiring is electrically connected to the first external electrode via a plurality of first lead wirings arranged in the direction of the coil axis. Except for this point, the inductor component of Embodiment 2 of the present invention is the same as the inductor component of Embodiment 1 of the present invention.

[0142] Figure 4 is a schematic perspective view showing an example of an inductor component according to Embodiment 2 of the present invention.

[0143] In the inductor component 1B shown in Figure 4, the first coil wiring 21a is electrically connected to the first external electrode 30a via two first lead wirings 22aa and 22ab, which are aligned in the direction of the coil axis.

[0144] Figure 5 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment b1-b2 of the inductor component shown in Figure 4. More specifically, Figure 5 shows a cross-section of the inductor component 1B that includes the boundary between the first coil wiring 21a and the first lead wiring 22aa, and the boundary between the first coil wiring 21a and the first lead wiring 22ab.

[0145] As shown in Figure 5, the dimensions W22aa of the first lead wiring 22aa in the coil axis direction and the dimensions W22ab of the first lead wiring 22ab in the coil axis direction are each smaller than the dimensions W21a of the first coil wiring 21a in the coil axis direction.

[0146] Figures 4 and 5 show an example configuration in which two first lead wires are arranged in the direction of the coil axis, but there may be three or more first lead wires arranged in the direction of the coil axis. Below, we will show an example configuration in which three or four first lead wires are arranged in the direction of the coil axis.

[0147] Figure 6 is a schematic cross-sectional view showing an example of a configuration in which three first lead wires are arranged in the coil axis direction, compared to the configuration shown in Figure 5.

[0148] As shown in Figure 6, in addition to the first lead wires 22aa and 22ab, there is a first lead wire 22ac located between the first lead wires 22aa and 22ab in the coil axis direction.

[0149] As shown in Figure 6, the dimensions W22aa of the first lead wiring 22aa in the coil axis direction, W22ab of the first lead wiring 22ab in the coil axis direction, and W22ac of the first lead wiring 22ac in the coil axis direction are each smaller than the dimension W21a of the first coil wiring 21a in the coil axis direction.

[0150] Figure 7 is a schematic cross-sectional view showing an example of a configuration in which four first lead wires are arranged in the coil axis direction, compared to the configuration shown in Figure 6.

[0151] As shown in Figure 7, in addition to the four first lead wires 22aa, 22ab, and 22ac, a first lead wire 22ad is provided, which is located between the first lead wires 22ab and 22ac in the coil axis direction.

[0152] As shown in Figure 7, the dimensions W22aa of the first lead wiring 22aa in the coil axis direction, W22ab of the first lead wiring 22ab in the coil axis direction, W22ac of the first lead wiring 22ac in the coil axis direction, and W22ad of the first lead wiring 22ad in the coil axis direction are each smaller than the dimension W21a of the first coil wiring 21a in the coil axis direction.

[0153] As described above, in an inductor component (e.g., inductor component 1B) in which the first coil wiring 21a is electrically connected to the first external electrode 30a via a plurality of first lead wirings arranged in the direction of the coil axis, the increase in DC resistance (Rdc) is suppressed compared to an inductor component (e.g., inductor component 1A) in which the first coil wiring 21a is electrically connected to the first external electrode 30a via a single first lead wiring.

[0154] As shown in Figures 5, 6, and 7, it is preferable that the dimensions of the multiple first lead wires in the coil axis direction are the same.

[0155] In the example shown in Figure 5, the dimensions W22aa of the first lead wiring 22aa in the coil axis direction and the dimensions W22ab of the first lead wiring 22ab in the coil axis direction are the same.

[0156] In the example shown in Figure 6, the dimensions W22aa of the first lead wiring 22aa in the coil axis direction, W22ab of the first lead wiring 22ab in the coil axis direction, and W22ac of the first lead wiring 22ac in the coil axis direction are the same.

[0157] In the example shown in Figure 7, the dimensions W22aa of the first lead wiring 22aa in the coil axis direction, W22ab of the first lead wiring 22ab in the coil axis direction, W22ac of the first lead wiring 22ac in the coil axis direction, and W22ad of the first lead wiring 22ad in the coil axis direction are all the same.

[0158] As described above, in an inductor component in which the dimensions of multiple first lead wires in the coil axis direction are the same, the increase in DC resistance is suppressed compared to an inductor component in which the dimensions of multiple first lead wires in the coil axis direction are different from each other or partially different. Furthermore, in an inductor component in which the dimensions of multiple first lead wires in the coil axis direction are the same, the formation of multiple first lead wires becomes easier, and the pattern design of the coil 20 becomes easier.

[0159] The dimensions of the multiple first lead wires in the coil axis direction may differ from each other, or may differ in some respects.

[0160] Figure 8 is a schematic cross-sectional diagram showing a modified example of the configuration shown in Figure 5. Figure 9 is a schematic cross-sectional diagram showing another modified example of the configuration shown in Figure 5.

[0161] As shown in Figures 8 and 9, the first lead wire 22aa is located on the surface side of the base body 10 (see Figure 4) in the coil axis direction compared to the first lead wire 22ab. Hereinafter, the first lead wire 22aa will be used as an example of the first outer lead wire in the inductor component of the present invention.

[0162] As shown in Figures 8 and 9, the first lead wire 22ab is located inside the body 10 (see Figure 4) in the coil axis direction compared to the first lead wire 22aa.

[0163] In this specification, one wiring is said to be located inside the element more than the other wiring, meaning that, with respect to the same surface of the element, the distance in the coil axis direction between one wiring and the surface of the element is greater than the distance in the coil axis direction between the other wiring and the surface of the element. More specifically, one wiring is said to be located inside the element more than the other wiring, meaning that, in the coil axis direction, the minimum distance between one wiring and the surface of the element is greater than the minimum distance between the other wiring and the surface of the element.

[0164] In other words, as shown in Figures 8 and 9, the first lead wire 22ab is located at a greater distance from the surface of the base body 10 (see Figure 4) (side surface 13a in Figure 4) than the first lead wire 22aa in the coil axis direction. Hereafter, the first lead wire 22ab will be used as an example of the first inner lead wire in the inductor component of the present invention.

[0165] As shown in Figures 8 and 9, the dimensions W22aa of the first lead wiring 22aa in the coil axis direction and the dimensions W22ab of the first lead wiring 22ab in the coil axis direction may be different from each other.

[0166] In the example shown in Figure 8, the dimension W22aa of the first lead wire 22aa in the coil axis direction is smaller than the dimension W22ab of the first lead wire 22ab in the coil axis direction.

[0167] In the example shown in Figure 9, the dimension W22ab of the first lead wiring 22ab in the coil axis direction is smaller than the dimension W22aa of the first lead wiring 22aa in the coil axis direction.

[0168] Figure 10 is a schematic cross-sectional view showing a modified example of the configuration shown in Figure 6.

[0169] As shown in Figure 10, the first lead wire 22ac is positioned adjacent to both the first lead wire 22aa and the first lead wire 22ab in the coil axis direction. Hereafter, the first lead wire 22ac will be used as an example of the first intermediate lead wire in the inductor component of the present invention.

[0170] As shown in Figure 10, the dimensions W22aa of the first lead wiring 22aa in the coil axis direction, W22ab of the first lead wiring 22ab in the coil axis direction, and W22ac of the first lead wiring 22ac in the coil axis direction may differ in some respects.

[0171] In the example shown in Figure 10, the dimensions W22ab of the first lead wiring 22ab in the coil axis direction and the dimensions W22ac of the first lead wiring 22ac in the coil axis direction are the same. On the other hand, the dimension W22aa of the first lead wiring 22aa in the coil axis direction is smaller than the dimensions W22ab of the first lead wiring 22ab and the dimensions W22ac of the first lead wiring 22ac in the coil axis direction.

[0172] As described above, in inductor components where the dimensions of multiple first lead wires in the coil axis direction differ from each other or differ in some respects, the stress remaining near the first lead wires during firing in the manufacturing process is more easily suppressed in the path where external loads (especially chemical erosion loads) are applied.

[0173] In this case, if the dimension W22aa of the first lead wiring 22aa in the coil axis direction is smaller than the dimension W22ab of the first lead wiring 22ab in the coil axis direction, the dimension W22aa of the first lead wiring 22aa, which is close to the surface (in this case, the side surface 13a) of the base body 10 where external loads (especially chemical erosion loads) are likely to be applied, becomes smaller. As a result, residual stress in the vicinity of the first lead wiring 22aa during firing in the manufacturing process is suppressed, and in particular, stress in the path where external loads (especially chemical erosion loads) are applied in the vicinity of the first lead wiring 22aa is more easily suppressed.

[0174] Furthermore, if the dimension W22ab of the first lead wiring 22ab in the coil axis direction is smaller than the dimension W22aa of the first lead wiring 22aa in the coil axis direction, good coil characteristics are more likely to be ensured.

[0175] As shown in Figures 6 and 7, when there are three or more first lead wires, it is preferable that the spacing between the multiple first lead wires in the coil axis direction is the same.

[0176] In the example shown in Figure 6, the distance Xa between the first lead wire 22aa and the first lead wire 22ac in the coil axis direction, and the distance Xb between the first lead wire 22ab and the first lead wire 22ac in the coil axis direction are the same.

[0177] In the example shown in Figure 7, the distance Xa in the coil axis direction between the first lead wire 22aa and the first lead wire 22ac, the distance Xc in the coil axis direction between the first lead wire 22ac and the first lead wire 22ad, and the distance Xd in the coil axis direction between the first lead wire 22ab and the first lead wire 22ad are all the same.

[0178] As described above, in an inductor component in which the spacing of multiple first lead wires in the coil axis direction is the same, compared to an inductor component in which the spacing of multiple first lead wires in the coil axis direction is different from each other or partially different, the stress remaining near the first lead wires during firing in the manufacturing process is suppressed in the path where external loads (especially chemical erosion loads) are applied. Furthermore, in an inductor component in which the spacing of multiple first lead wires in the coil axis direction is the same, the formation of multiple first lead wires becomes easier, and the degree of freedom in the pattern design of the coil 20 is increased.

[0179] The spacing between the multiple first lead wires in the coil axis direction may be different from each other, or may be different in some respects.

[0180] Figure 11 is a schematic cross-sectional view showing another modified example of the configuration shown in Figure 6. Figure 12 is a schematic cross-sectional view showing yet another modified example of the configuration shown in Figure 6.

[0181] As shown in Figures 11 and 12, the distance Xa between the first lead wire 22aa and the first lead wire 22ac in the coil axis direction, and the distance Xb between the first lead wire 22ab and the first lead wire 22ac in the coil axis direction, may be different from each other.

[0182] In the example shown in Figure 11, the distance Xa in the coil axis direction between the first lead wire 22aa and the first lead wire 22ac is greater than the distance Xb in the coil axis direction between the first lead wire 22ab and the first lead wire 22ac.

[0183] In the example shown in Figure 12, the distance Xb between the first lead wire 22ab and the first lead wire 22ac in the coil axis direction is greater than the distance Xa between the first lead wire 22aa and the first lead wire 22ac in the coil axis direction.

[0184] As described above, in inductor components where the spacing between multiple first lead wires in the coil axis direction differs from one another or differs in some parts, the stress remaining near the first lead wires during firing in the manufacturing process is more easily suppressed in the path where external loads (especially chemical erosion loads) are applied.

[0185] In this case, if the distance Xa in the coil axis direction between the first lead wiring 22aa and the first lead wiring 22ac is greater than the distance Xb in the coil axis direction between the first lead wiring 22ab and the first lead wiring 22ac, the dense arrangement of lead wiring in the region close to the surface (here, the side surface 13a) of the base body 10 is suppressed. Therefore, during firing in the manufacturing process, residual stress in the vicinity of the lead wiring (especially the first lead wiring 22aa) in the region close to the surface (here, the side surface 13a) of the base body 10 is suppressed.

[0186] Furthermore, if the distance Xb between the first lead wire 22ab and the first lead wire 22ac in the coil axis direction is greater than the distance Xa between the first lead wire 22aa and the first lead wire 22ac in the coil axis direction, good coil characteristics are more likely to be ensured.

[0187] The distance between the two lead wires in the coil axis direction is determined as the distance in the coil axis direction between the outermost end of the other lead wire in the cross-section of the one lead wire, for which the dimensions in the coil axis direction described above are determined, and the outermost end of the one lead wire in the cross-section of the other lead wire, for which the dimensions in the coil axis direction described above are determined.

[0188] As shown in Figures 5, 6, 7, 8, 9, 10, 11, and 12, when viewed from a length direction L perpendicular to the coil axis direction, it is preferable that one end of the first coil wiring 21a (here, the end on the side surface 13a side of the base body 10) E21a and the end of the first lead wiring 22aa opposite to the first lead wiring 22ab (here, the end on the side surface 13a side of the base body 10) E22aa are at the same height in the coil axis direction. Furthermore, as shown in Figures 5, 6, 7, 8, 9, 10, 11, and 12, when viewed from the length direction L, it is preferable that the other end of the first coil wiring 21a (here, the end on the side 13b side of the body 10) F21a, which is located inside the body 10 more than one end of the first coil wiring 21a (here, the end on the side 13a side of the body 10) E21a, that is, the other end of the first coil wiring 21a (here, the end on the side 13b side of the body 10) F21a, which is located further inside the body 10 than one end of the first coil wiring 21a (here, the end on the side 13a side of the body 10) E21a, and the end of the first lead wiring 22ab opposite to the first lead wiring 22aa (here, the end on the side 13b side of the body 10) F22ab, are at the same height.

[0189] As described above, in inductor components where the first lead wiring 22aa and the first lead wiring 22ab are as far apart as possible in the coil axis direction, the areas where stress remains during firing in the manufacturing process are dispersed, thus suppressing localized stress increases.

[0190] As shown in Figure 4, in the inductor component 1B, the second coil wiring 21b may be electrically connected to the second external electrode 30b via two second lead wirings 22ba and 22bb arranged in the coil axis direction. Similarly, the second coil wiring 21b may be electrically connected to the second external electrode 30b via three or more second lead wirings arranged in the coil axis direction. In other words, the second coil wiring 21b may be electrically connected to the second external electrode 30b via a plurality of second lead wirings arranged in the coil axis direction.

[0191] The configurations of the multiple second lead-out wirings are preferably the same as the configurations of the multiple first lead-out wirings described above.

[0192] [Embodiment 3] In the inductor component of Embodiment 3 of the present invention, the dimension of the first lead wiring in the coil axis direction increases from the first external electrode side toward the first coil wiring side. Except for this point, the inductor component of Embodiment 3 of the present invention is the same as the inductor component of Embodiment 1 of the present invention.

[0193] Figure 13 is a schematic perspective view showing an example of an inductor component according to Embodiment 3 of the present invention.

[0194] In the inductor component 1C shown in Figure 13, the first coil wiring 21a is electrically connected to the first external electrode 30a via the first lead wiring 22ae.

[0195] The first lead wiring 22ae has a lead wiring section 23ae and a lead wiring section 24ae.

[0196] The lead-out wiring section 23ae is connected to the first external electrode 30a.

[0197] The lead-out wiring section 24ae is provided between the lead-out wiring section 23ae and the first coil wiring 21a, and is connected to both.

[0198] Figure 14 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment c1-c2 of the inductor component shown in Figure 13. More specifically, Figure 14 shows a cross-section of the inductor component 1C that includes the boundary between the lead wiring section 23ae and the lead wiring section 24ae.

[0199] Figure 15 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment d1-d2 of the inductor component shown in Figure 13. More specifically, Figure 15 shows a cross-section of the inductor component 1C that includes the boundary between the lead wiring portion 24ae and the first coil wiring 21a.

[0200] As shown in Figures 13, 14, and 15, the dimensions of the first lead wire 22ae in the coil axis direction increase from the first external electrode 30a side toward the first coil wire 21a side.

[0201] In the examples shown in Figures 14 and 15, the dimensions of the first lead wiring 22ae in the coil axis direction increase in stages from the first external electrode 30a side towards the first coil wiring 21a side, from the dimension W23ae of the lead wiring section 23ae to the dimension W24ae of the lead wiring section 24ae in the coil axis direction. In other words, in the examples shown in Figures 14 and 15, the dimensions of the first lead wiring 22ae in the coil axis direction increase in two stages from the first external electrode 30a side towards the first coil wiring 21a side.

[0202] Furthermore, the dimensions of the first lead wiring 22ae in the coil axis direction may increase in three or more steps from the first external electrode 30a side toward the first coil wiring 21a side.

[0203] In the examples shown in Figures 13, 14, and 15, the shape of the first lead wire 22ae when viewed from the height direction T is stepped on the side 13b of the base body 10, such that the dimensions in the coil axis direction increase in stages from the first external electrode 30a side to the first coil wire 21a side.

[0204] Furthermore, the external shape of the first lead wiring 22ae when viewed from the height direction T may be stepped on the side 13a of the base body 10, or stepped on both the side 13a and side 13b of the base body 10, such that the dimensions in the coil axis direction gradually increase from the first external electrode 30a side to the first coil wiring 21a side.

[0205] The dimensions of the first lead wiring 22ae in the coil axis direction may gradually increase from the first external electrode 30a side toward the first coil wiring 21a side.

[0206] For example, the shape of the first lead wiring 22ae when viewed from the height direction T may be a straight line inclined on the side 13b of the base body 10, or a straight line inclined on the side 13a of the base body 10, or a straight line inclined on both the side 13a and side 13b of the base body 10, or a curved shape on the side 13b of the base body 10, or a curved shape on the side 13a of the base body 10, or a curved shape on both the side 13a and side 13b of the base body 10, or a shape that is a combination of several of these.

[0207] As described above, in an inductor component where the dimensions of the first lead wiring in the coil axis direction increase from the first external electrode side toward the first coil wiring side, current concentration in the first lead wiring is suppressed.

[0208] As shown in Figure 13, in the inductor component 1C, the second coil wiring 21b may be electrically connected to the second external electrode 30b via the second lead wiring 22be. In this case, as shown in Figure 13, the dimension of the second lead wiring 22be in the coil axis direction may increase from the second external electrode 30b side toward the second coil wiring 21b side.

[0209] Other embodiments of the second lead wiring 22be are preferably the same as the embodiments of the first lead wiring 22ae described above.

[0210] [Embodiment 4] In the inductor component of Embodiment 4 of the present invention, the number of first lead wires increases from the first external electrode side toward the first coil wiring side. The number of lead wires is determined as the number in a cross-section perpendicular to the direction in which the lead wires extend. Except for this point, the inductor component of Embodiment 4 of the present invention is the same as the inductor component of Embodiment 1 of the present invention.

[0211] Figure 16 is a schematic perspective view showing an example of an inductor component according to Embodiment 4 of the present invention.

[0212] In the inductor component 1D shown in Figure 16, the first coil wiring 21a is electrically connected to the first external electrode 30a via the first lead wiring 22af.

[0213] The first lead-out wiring 22af includes a lead-out wiring section 23af, a lead-out wiring section 24af, and a lead-out wiring section 25af.

[0214] The lead-out wiring section 23af is connected to the first external electrode 30a.

[0215] The lead-out wiring section 24af is provided between the lead-out wiring section 23af and the first coil wiring 21a, and is connected to both.

[0216] The lead-out wiring section 25af is electrically connected to the lead-out wiring section 23af and the first coil wiring 21a in parallel with the lead-out wiring section 24af.

[0217] Figure 17 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment e1-e2 of the inductor component shown in Figure 16. More specifically, Figure 17 shows a cross-section of the inductor component 1D that includes the boundary between the lead wiring section 23af and the lead wiring section 24af.

[0218] Figure 18 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment f1-f2 of the inductor component shown in Figure 16. More specifically, Figure 18 shows a cross-section of the inductor component 1D that includes the boundary between the lead-out wiring section 24af (lead-out wiring section 25af) and the first coil wiring 21a.

[0219] As shown in Figures 16, 17, and 18, the number of first lead wires 22af increases from the first external electrode 30a side towards the first coil wire 21a side.

[0220] In the examples shown in Figures 16, 17, and 18, the number of first lead-out wirings 22af increases from one (lead-out wiring section 23af) to two (lead-out wiring sections 24af and 25af) as you move from the first external electrode 30a side to the first coil wiring 21a side.

[0221] Furthermore, the number of first lead wires 22af may increase in ways other than those described above as you move from the first external electrode 30a side towards the first coil wire 21a side. For example, the number of first lead wires 22af may increase from one to three as you move from the first external electrode 30a side towards the first coil wire 21a side, or it may increase from one to two, and then from two to three. In the example described above, the number of first lead wires 22af is one at the first external electrode 30a side, but there may be multiple.

[0222] As described above, in an inductor component where the number of first lead wires increases from the first external electrode side to the first coil wiring side, the concentration of current in the first lead wires is suppressed.

[0223] As shown in Figure 16, in the inductor component 1D, the second coil wiring 21b may be electrically connected to the second external electrode 30b via the second lead wiring 22bf. In this case, as shown in Figure 16, the number of second lead wirings 22bf may increase from the second external electrode 30b side toward the second coil wiring 21b side.

[0224] Other embodiments of the second lead wiring 22bf are preferably the same as the embodiments of the first lead wiring 22af described above.

[0225] [Embodiment 5] In the inductor component of Embodiment 5 of the present invention, when viewed from a longitudinal direction perpendicular to the coil axis direction, both ends of the first lead wire and both ends of the first external electrode are offset from each other in the coil axis direction. Except for this point, the inductor component of Embodiment 5 of the present invention is the same as the inductor component of Embodiment 1 of the present invention.

[0226] Figure 19 is a schematic perspective view showing an example of an inductor component according to Embodiment 5 of the present invention.

[0227] Figure 20 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment g1-g2 of the inductor component shown in Figure 19. More specifically, Figure 20 shows a cross-section of the inductor component shown in Figure 19, including the boundary between the first lead wire and the first external electrode.

[0228] In the inductor component 1E shown in Figure 19, as shown in Figure 20, when viewed from a length direction L perpendicular to the coil axis direction, the ends E22aa and F22aa of the first lead wire 22aa and the ends E30a and F30a of the first external electrode 30a are offset from each other in the coil axis direction.

[0229] In inductor component 1E, when viewed from the length direction L, the ends E22aa and F22aa of the first lead wire 22aa and the ends E30a and F30a of the first external electrode 30a are offset from each other in the coil axis direction. As a result, compared to inductor component 1A, the areas where stress tends to remain near the first lead wire 22aa during firing in the manufacturing process are further away from the side surface 13a of the base body 10 and the end E30a of the first external electrode 30a on the side surface 13a of the base body 10. Therefore, in inductor component 1E, even if an external load is applied to the side surface 13a of the base body 10 and the end E30a of the first external electrode 30a on the side surface 13a of the base body 10, delamination of the interface between the first lead wire 22aa and the base body 10 triggered by the external load is suppressed, and consequently, crack occurrence is suppressed.

[0230] Figures 19 and 20 show an example of a configuration in which the first coil wiring 21a is electrically connected to the first external electrode 30a via a single first lead wiring 22aa. However, the first coil wiring 21a may be electrically connected to the first external electrode 30a via a plurality of first lead wirings. In this case, when viewed from the length direction L, it is preferable that both ends of each first lead wiring and both ends of the first external electrode 30a are offset from each other in the coil axis direction.

[0231] Figure 21 is a schematic perspective view showing an example of an inductor component in a modified embodiment 5 of the present invention.

[0232] Figure 22 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment h1-h2 of the inductor component shown in Figure 21. More specifically, Figure 22 shows a cross-section of the inductor component shown in Figure 21, including the boundary between the first lead wire and the first external electrode.

[0233] Figure 23 is a schematic cross-sectional diagram showing an example of a cross-section along the line segment j1-j2 of the inductor component shown in Figure 21. More specifically, Figure 23 shows a cross-section of the inductor component shown in Figure 21 that includes the boundary between the first lead wiring and the first coil wiring.

[0234] In the inductor component 1E' shown in Figure 21, as shown in Figure 22, when viewed from the length direction L, the ends E22aa and F22aa of the first lead wire 22aa and the ends E30a and F30a of the first external electrode 30a are offset from each other in the coil axis direction.

[0235] In the inductor component 1E' shown in Figure 21, as shown in Figure 23, when viewed from the length direction L, one end of the first coil wiring 21a (here, the end on the side surface 13a of the base body 10) E21a and one end of the first lead wiring 22aa (here, the end on the side surface 13a of the base body 10) E22aa are located at different heights in the coil axis direction. Furthermore, in the inductor component 1E' shown in Figure 21, as shown in Figure 23, when viewed from the length direction L, in the coil axis direction, the other end of the first coil wiring 21a (here, the end on the side 13b side of the body 10) F21a is located inside the body 10 more than one end of the first coil wiring 21a (here, the end on the side 13a side of the body 10) E21a, that is, the other end of the first coil wiring 21a (here, the end on the side 13a side of the body 10) is located further inside the body 10 than one end of the first coil wiring 21a (here, the end on the side 13a side of the body 10) E21a. The end of body 10 on side 13b (F21a) and the other end of the first lead wiring 22aa (here, the end on side 13b of body 10) F22aa, which is located inside body 10 more than one end of the first lead wiring 22aa (here, the end of body 10 on side 13a) E22aa, are at the same height.

[0236] As described above, in the inductor component 1E', the first lead wire 22aa is positioned as far away as possible from the side surface 13a of the base body 10 and the end E30a of the first external electrode 30a on the side surface 13a of the base body 10 in the coil axis direction. Compared to the inductor component 1E, the areas where stress tends to remain near the first lead wire 22aa during firing in the manufacturing process are further away from the side surface 13a of the base body 10 and the end E30a of the first external electrode 30a on the side surface 13a of the base body 10. Therefore, in the inductor component 1E', even if an external load is applied to the side surface 13a of the base body 10 and the end E30a of the first external electrode 30a on the side surface 13a of the base body 10, delamination of the interface between the first lead wire 22aa and the base body 10 triggered by the external load is suppressed, and as a result, crack occurrence is suppressed.

[0237] Figures 21, 22, and 23 show an example of a configuration in which the first coil wiring 21a is electrically connected to the first external electrode 30a via one first lead wiring 22aa. However, the first coil wiring 21a may be electrically connected to the first external electrode 30a via multiple first lead wirings. In this case, when viewed from the length direction L, in the coil axis direction, both ends of each first lead wiring and both ends E30a and F30a of the first external electrode 30a are offset from each other. Preferably, for at least one first lead wiring, when viewed from the length direction L, in the coil axis direction, one end E21a of the first coil wiring 21a and one end of the first lead wiring are at different heights, and when viewed from the length direction L, in the coil axis direction, the other end F21a of the first coil wiring 21a and the other end of the first lead wiring are at the same height.

[0238] As shown in Figures 19 and 21, when viewed from the length direction L, the ends of the second lead wire 22ba and the ends of the second external electrode 30b may be offset from each other in the coil axis direction. In this case, as shown in Figure 21, when viewed from the length direction L, one end of the second coil wire 21b (here, the end on the side surface 13b of the base body 10) and one end of the second lead wire 22ba (here, the end on the side surface 13b of the base body 10) may be located at different heights in the coil axis direction. Furthermore, when viewed from the length direction L, in the coil axis direction, the other end of the second coil wiring 21b (here, the end on the side 13a side of the body 10) is located further inside the body 10 than one end of the second coil wiring 21b (here, the end on the side 13b side of the body 10), that is, the other end of the second coil wiring 21b (here, the end on the side 13b side of the body 10) is located further inside the body 10 than one end of the second coil wiring 21b (here, the end on the side 13b side of the body 10). The end of the second lead wiring 22ba and the other end of the second lead wiring 22ba that is located inside the body 10 more than one end of the second lead wiring 22ba (here, the end on the side 13b side of the body 10), that is, the other end of the second lead wiring 22ba that is located further from the surface of the body 10 (here, the end on the side 13b side of the body 10) than one end of the second lead wiring 22ba (here, the end on the side 13b side of the body 10), may be located at the same height.

[0239] In Embodiments 1, 2, 3, 4, and 5 (a modified version of Embodiment 5) described above, examples were shown in which the mounting surface of the base body is parallel to the coil axis direction. However, in these embodiments, the mounting surface of the base body may be perpendicular to the coil axis direction.

[0240] [Embodiment 6] In the inductor component of Embodiment 6 of the present invention, the surface of the base body 10 includes a bottom surface perpendicular to the coil axis direction and a top surface opposite to the bottom surface in the coil axis direction, and the bottom surface of the base body is the mounting surface. Furthermore, in the inductor component of Embodiment 6 of the present invention, the plurality of coil wirings further include second coil wirings electrically connected to a second external electrode via at least one second lead wiring, the first lead wirings are located on the top surface side of the base body in the coil axis direction than the second lead wirings, and the dimensions of each first lead wiring in the coil axis direction are smaller than the dimensions of each second lead wiring in the coil axis direction. Except in this respect, the inductor component of Embodiment 6 of the present invention is the same as the inductor component of Embodiment 1 of the present invention.

[0241] Figure 24 is a schematic perspective view showing an example of an inductor component according to Embodiment 6 of the present invention.

[0242] The inductor component 1F shown in Figure 24 comprises a base body 10, a coil 50, a first external electrode 30a, and a second external electrode 30b.

[0243] As shown in Figure 24, in the inductor component 1F, the surface of the base body 10 includes end faces 11a and 11b that are in the length direction L, a top surface 12a and a bottom surface 12b that are in the height direction T, and side surfaces 13a and 13b that are in the width direction W. In the inductor component 1F, the height direction T is parallel to the coil axis direction of the coil 50. That is, in the inductor component 1F, the surface of the base body 10 includes a bottom surface 12b that is perpendicular to the coil axis direction, and a top surface 12a that is in the coil axis direction and is opposite to the bottom surface 12b.

[0244] In this embodiment, unless otherwise specified, the coil axis direction is parallel to the height direction T.

[0245] In the inductor component 1F, the bottom surface 12b of the base body 10 is the mounting surface. More specifically, the bottom surface 12b of the base body 10 is the mounting surface that faces the mounting target (e.g., a circuit board) when the inductor component 1F is mounted. Therefore, in the inductor component 1F, the mounting surface of the base body 10, that is, the bottom surface 12b of the base body 10, is perpendicular to the coil axis direction.

[0246] As shown in Figure 24, the coil 50 is located inside the base body 10 and is wound spirally along the coil axis.

[0247] The direction of the coil axis of coil 50 is the direction in which the coil axis CB of coil 50 extends, and as described above, it is perpendicular to the bottom surface 12b, which is the mounting surface of the base body 10.

[0248] As shown in Figure 24, the coil 50 is made up of multiple coil wirings stacked in the direction of the coil axis and electrically connected.

[0249] In the example shown in Figure 24, the multiple coil wirings include a first coil wiring 51a and a second coil wiring 51b.

[0250] The first coil wiring 51a is located at the outermost position on the top surface 12a side of the base body 10 in the coil axis direction, among the multiple coil wirings.

[0251] The second coil wiring 51b is located at the outermost position on the bottom surface 12b side of the base body 10 in the coil axis direction, among the multiple coil wirings.

[0252] In the example shown in Figure 24, the first coil wiring 51a and the second coil wiring 51b are electrically connected via a connecting conductor 59a that penetrates the insulating layer between them in the direction of the coil axis.

[0253] As shown in Figure 24, the first external electrode 30a is electrically connected to one end of the coil 50. More specifically, the first coil wiring 51a constituting the coil 50 is electrically connected to the first external electrode 30a via a first lead wiring 52aa.

[0254] As shown in Figure 24, the first external electrode 30a extends from a portion of the bottom surface 12b of the base body 10 to a portion of the end surface 11a. In other words, the first external electrode 30a is exposed not only on a portion of the bottom surface 12b of the base body 10, but also on a portion of the end surface 11a of the base body 10.

[0255] As shown in Figure 24, the second external electrode 30b is electrically connected to the other end of the coil 50. More specifically, the second coil wiring 51b constituting the coil 50 is electrically connected to the second external electrode 30b via a second lead wiring 52ba.

[0256] As shown in Figure 24, the second external electrode 30b extends from a portion of the bottom surface 12b of the base body 10 to a portion of the end surface 11b. In other words, the second external electrode 30b is exposed not only on a portion of the bottom surface 12b of the base body 10, but also on a portion of the end surface 11b of the base body 10.

[0257] As shown in Figure 24, the first lead wire 52aa is located on the top surface 12a side of the base body 10 in the coil axis direction compared to the second lead wire 52ba.

[0258] As shown in Figure 24, the dimension of the first lead wiring 52aa in the coil axis direction is smaller than the dimension of the second lead wiring 52ba in the coil axis direction.

[0259] In inductor component 1F, the dimension of the first lead wire 52aa in the coil axis direction is smaller than the dimension of the second lead wire 52ba in the coil axis direction, thereby suppressing residual stress near the first lead wire 52aa during firing in the manufacturing process. As a result, even if an external load is applied to the base body 10 and the first external electrode 30a near the first lead wire 52aa in inductor component 1F, delamination of the interface between the first lead wire 52aa and the base body 10 triggered by the external load is suppressed, and consequently, crack occurrence is suppressed.

[0260] Figure 24 shows an example of a configuration in which the first coil wiring 51a is electrically connected to the first external electrode 30a via one first lead wiring 52aa, and the second coil wiring 51b is electrically connected to the second external electrode 30b via one second lead wiring 52ba. However, the first coil wiring 51a may be electrically connected to the first external electrode 30a via multiple first lead wirings, and the second coil wiring 51b may be electrically connected to the second external electrode 30b via multiple second lead wirings. In other words, the first coil wiring 51a may be electrically connected to the first external electrode 30a via at least one first lead wiring, and the second coil wiring 51b may be electrically connected to the second external electrode 30b via at least one second lead wiring. In this case, the dimension of each first lead wiring in the coil axis direction should be smaller than the dimension of each second lead wiring in the coil axis direction. In other words, the maximum dimension of all first lead wires in the coil axis direction must be smaller than the minimum dimension of all second lead wires in the coil axis direction.

[0261] In a second embodiment, the inductor component of the present invention comprises a base body, a coil provided inside the base body and wound spirally along the coil axis direction, a first external electrode electrically connected to one end of the coil and exposed on the surface of the base body, and a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, wherein the base body includes an insulator, the coil is made up of a plurality of coil wirings stacked in the coil axis direction and electrically connected, the plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead wiring, and when viewed from a longitudinal direction perpendicular to the coil axis direction, both ends of the first lead wiring and both ends of the first external electrode are offset from each other in the coil axis direction.

[0262] [Embodiment 7] An example of a second embodiment of the inductor component of the present invention will be described below as the inductor component of Embodiment 7 of the present invention.

[0263] FIG. 25 is a perspective schematic view showing an example of an inductor component according to Embodiment 7 of the present invention.

[0264] The inductor component 2A shown in FIG. 25 has a base body 10, a coil 20, a first external electrode 30a, and a second external electrode 30b.

[0265] The base body 10, the coil 20, the first external electrode 30a, and the second external electrode 30b that constitute the inductor component 2A are the same as the base body 10, the coil 20, the first external electrode 30a, and the second external electrode 30b that constitute the inductor component 1A described above, respectively.

[0266] In the present embodiment, unless otherwise specified, the coil axis direction is set to a direction parallel to the width direction W.

[0267] As shown in FIG. 25, the first external electrode 30a is electrically connected to one end portion of the coil 20. More specifically, as shown in FIG. 25, the first coil wiring 21a that constitutes the coil 20 is electrically connected to the first external electrode 30a via the first lead wiring 22aa'.

[0268] As shown in FIG. 25, it is preferable that the dimension of the first lead wiring 22aa' in the coil axis direction is the same as the dimension of the first coil wiring 21a in the coil axis direction.

[0269] In the inductor component 2A, since the dimension of the first lead wiring 22aa' in the coil axis direction is the same as the dimension of the first coil wiring 21a in the coil axis direction, an increase in DC resistance is suppressed as compared with the inductor component 1A.

[0270] FIG. 26 is a cross-sectional schematic view showing an example of a cross-section along the line segment k1-k2 of the inductor component shown in FIG. 25. More specifically, FIG. 26 shows a cross-section including the boundary between the first lead wiring 22aa' and the first external electrode 30a in the inductor component 2A.

[0271] As shown in FIG. 26, when viewed from the length direction L orthogonal to the coil axis direction, in the coil axis direction, both ends E22aa' and F22aa' of the first lead wiring 22aa' and both ends E30a and F30a of the first external electrode 30a are offset from each other.

[0272] In the inductor component 2A, when viewed from the length direction L, in the coil axis direction, since both ends E22aa' and F22aa' of the first lead wiring 22aa' and both ends E30a and F30a of the first external electrode 30a are offset from each other, compared with the inductor component 1A, in the vicinity of the first lead wiring 22aa' during firing in the manufacturing process, locations where stress is likely to remain move away from the side surface 13a of the element body 10 and the end E30a on the side surface 13a side of the element body 10 in the first external electrode 30a. Therefore, in the inductor component 2A, even when an external load is applied to the side surface 13a of the element body 10 and the end E30a on the side surface 13a side of the element body 10 in the first external electrode 30a, peeling between the interface of the first lead wiring 22aa' and the element body 10 triggered by the external load is suppressed, and as a result, the occurrence of cracks is suppressed.

[0273] As shown in FIG. 26, when viewed from the length direction L orthogonal to the coil axis direction, in the height direction T orthogonal to the coil axis direction and the length direction L, one end G22aa' of the first lead wiring 22aa' and one end G30a of the first external electrode 30a are in the same position. Thereby, the stray capacitance between the first lead wiring 22aa' and the first external electrode 30a is suppressed.

[0274] As shown in FIG. 25, the second external electrode 30b is electrically connected to the other end of the coil 20. More specifically, as shown in FIG. 25, the second coil wiring 21b constituting the coil 20 may be electrically connected to the second external electrode 30b via the second lead wiring 22ba'.

[0275] As shown in FIG. 25, it is preferable that the dimension of the second lead wiring 22ba' in the coil axis direction is the same as the dimension of the second coil wiring 21b in the coil axis direction.

[0276] As shown in Figure 25, when viewed from the length direction L, it is preferable that both ends of the second lead wiring 22ba' and both ends of the second external electrode 30b are offset from each other in the coil axis direction.

[0277] Figure 25 shows an example where the mounting surface of the base body is parallel to the coil axis direction, but the mounting surface of the base body may also be perpendicular to the coil axis direction.

[0278] Other embodiments of the first lead wiring 22aa' and the second lead wiring 22ba' are preferably the same as the first lead wiring and the second lead wiring of Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5 (a modified version of Embodiment 5), and Embodiment 6 described above.

[0279] With respect to the inductor component 2A, a configuration in which both ends E22aa' and F22aa' of the first lead wire 22aa' and both ends E30a and F30a of the first external electrode 30a are offset from each other in the coil axis direction when viewed from the length direction L can be achieved, for example, by reducing the dimension of the insulating layer between the first coil wire 21a and the second coil wire 21b in the coil axis direction, or by increasing the dimension of the first external electrode 30a in the coil axis direction, compared to an inductor component in which the dimensions of the first coil wire 21a and the first lead wire 22aa' are the same in the coil axis direction. A similar configuration can be achieved in which both ends of the second lead wire 22ba' and both ends of the second external electrode 30b are offset from each other in the coil axis direction when viewed from the length direction L.

[0280] In a third embodiment, the inductor component of the present invention comprises a base body, a coil provided inside the base body and wound helically along the coil axis direction, a first external electrode electrically connected to one end of the coil and exposed on the surface of the base body, and a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, wherein the base body includes an insulator, the surface of the base body includes a bottom surface perpendicular to the coil axis direction and a top surface opposite the bottom surface in the coil axis direction, the first external electrode and the second external electrode are exposed apart from each other at least on the bottom surface of the base body, and the coil comprises a plurality of coils stacked in the coil axis direction The wiring is electrically connected, and the plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead wiring, and a second coil wiring electrically connected to the second external electrode via at least one second lead wiring, wherein the first lead wiring is located on the top surface side of the body than the second lead wiring in the coil axis direction, and when viewed from a length direction perpendicular to the coil axis direction, the minimum distance between the end of the first lead wiring and the end of the first external electrode is greater than the minimum distance between the end of the second lead wiring and the end of the second external electrode in the coil axis direction and the width direction perpendicular to the length direction.

[0281] [Embodiment 8] An example of a third aspect of the inductor component of the present invention will be described below as the inductor component of Embodiment 8 of the present invention.

[0282] Figure 27 is a schematic perspective view showing an example of an inductor component according to Embodiment 8 of the present invention.

[0283] The inductor component 3A shown in Figure 27 comprises a base body 10, a coil 50, a first external electrode 30a, and a second external electrode 30b.

[0284] The basic body 10, coil 50, first external electrode 30a, and second external electrode 30b that constitute inductor component 3A are the same as the basic body 10, coil 50, first external electrode 30a, and second external electrode 30b that constitute inductor component 1F described above.

[0285] In this embodiment, unless otherwise specified, the coil axis direction is parallel to the height direction T.

[0286] As shown in Figure 27, the first external electrode 30a is electrically connected to one end of the coil 50. More specifically, as shown in Figure 27, the first coil wiring 51a constituting the coil 50 is electrically connected to the first external electrode 30a via the first lead wiring 52aa'.

[0287] As shown in Figure 27, it is preferable that the dimensions of the first lead wiring 52aa' in the coil axis direction are the same as the dimensions of the first coil wiring 51a in the coil axis direction.

[0288] In inductor component 3A, the increase in DC resistance is suppressed compared to inductor component 1F because the dimension of the first lead wire 52aa' in the coil axis direction is the same as the dimension of the first coil wire 51a in the coil axis direction.

[0289] As shown in Figure 27, the second external electrode 30b is electrically connected to the other end of the coil 50. More specifically, as shown in Figure 27, the second coil wiring 51b constituting the coil 50 is electrically connected to the second external electrode 30b via the second lead wiring 52ba'.

[0290] As shown in Figure 27, it is preferable that the dimensions of the second lead wiring 52ba' in the coil axis direction are the same as the dimensions of the second coil wiring 51b in the coil axis direction.

[0291] As shown in Figure 27, the first lead wire 52aa' is located on the top surface 12a side of the base body 10 in the coil axis direction compared to the second lead wire 52ba'.

[0292] FIG. 28 is a schematic cross-sectional view showing an example of a cross-section along the line segment m1 - m2 of the inductor component shown in FIG. 27. More specifically, FIG. 28 shows a cross-section including the boundary between the first lead wiring 52aa' and the first external electrode 30a in the inductor component 3A.

[0293] FIG. 29 is a schematic cross-sectional view showing an example of a cross-section along the line segment n1 - n2 of the inductor component shown in FIG. 27. More specifically, FIG. 29 shows a cross-section including the boundary between the second lead wiring 52ba' and the second external electrode 30b in the inductor component 3A.

[0294] As shown in FIGS. 28 and 29, when viewed from the length direction L orthogonal to the coil axis direction, in the width direction W orthogonal to the coil axis direction and the length direction L, the minimum distance Ya between the end of the first lead wiring 52aa' and the end of the first external electrode 30a is larger than the minimum distance Yb between the end of the second lead wiring 52ba' and the end of the second external electrode 30b.

[0295] In the inductor component 3A, when viewed from the length direction L, in the width direction W, since the minimum distance Ya between the end of the first lead wiring 52aa' and the end of the first external electrode 30a is larger than the minimum distance Yb between the end of the second lead wiring 52ba' and the end of the second external electrode 30b, compared with the inductor component 1F, locations where stress is likely to remain near the first lead wiring 52aa' during firing in the manufacturing process are away from the side surface 13a of the element body 10 and the end of the first external electrode 30a on the side surface 13a side of the element body 10. Therefore, in the inductor component 3A, even when an external load is applied to the side surface 13a of the element body 10 and the end of the first external electrode 30a on the side surface 13a side of the element body 10, interfacial peeling between the first lead wiring 52aa' triggered by the external load and the element body 10 is suppressed, and as a result, the occurrence of cracks is suppressed.

[0296] Other embodiments of the first lead wiring 52aa' and the second lead wiring 52ba' are preferably the same as the first lead wiring and the second lead wiring of Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5 (a modified version of Embodiment 5), and Embodiment 6 described above.

[0297] With respect to the inductor component 3A, when viewed from the length direction L, the minimum distance Ya between the end of the first lead wire 52aa' and the end of the first external electrode 30a in the width direction W is greater than the minimum distance Yb ​​between the end of the second lead wire 52ba' and the end of the second external electrode 30b. This configuration can be achieved, for example, by bending the first lead wire 52aa' toward the side 13b of the base body 10 more than the second lead wire 52ba', or by widening the first external electrode 30a toward the side 13a of the base body 10 more than the second external electrode 30b, compared to a configuration where the dimensions of the first coil wire 51a and the first lead wire 52aa of the inductor component 1F in the coil axis direction are the same.

[0298] This specification discloses the following:

[0299] <1> The base body and, A coil provided inside the above-mentioned base body and wound spirally along the coil axis, A first external electrode is electrically connected to one end of the above coil and is exposed on the surface of the above body, The device comprises a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, The above-mentioned base material includes an insulator, The above coil is made up of multiple coil wirings stacked in the direction of the coil axis and electrically connected, The plurality of coil wirings include a first coil wiring that is electrically connected to the first external electrode via at least one first lead wiring, An inductor component characterized in that the dimension of each of the above-mentioned first lead wires in the coil axis direction is smaller than the dimension of the above-mentioned first coil wire in the coil axis direction.

[0300] <2> The first coil wiring described above is electrically connected to the first external electrode via a plurality of first lead wires arranged in the direction of the coil axis. <1> The inductor components listed below.

[0301] <3> The dimensions of the multiple first lead wires in the coil axis direction are the same to one another. <2> The inductor components listed below.

[0302] <4> The plurality of first lead wires include a first outer lead wire and a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, The dimensions of the first outer lead wiring and the first inner lead wiring in the coil axis direction are different from each other. <2> The inductor components listed below.

[0303] <5> The dimension of the first outer lead wiring in the coil axis direction is smaller than the dimension of the first inner lead wiring in the coil axis direction. <4> The inductor components listed below.

[0304] <6> There are three or more of the above-mentioned first lead-out wirings. The spacing between the multiple first lead wires in the coil axis direction is the same. <2> ~ <5> An inductor component as described in any of the following.

[0305] <7> The plurality of first lead wires include a first outer lead wire, a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, and a first intermediate lead wire located adjacent to both the first outer lead wire and the first inner lead wire in the coil axis direction. The distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction, and the distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction, are different from each other. <2> ~ <5> An inductor component as described in any of the following.

[0306] <8> The distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction is greater than the distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction. <7> The inductor components listed below.

[0307] <9> The plurality of first lead wires include a first outer lead wire and a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, When viewed from a longitudinal direction perpendicular to the coil axis, in the coil axis direction, one end of the first coil wiring and the end of the first outer lead wiring opposite to the first inner lead wiring are at the same height. When viewed from the length direction as described above, in the coil axis direction, the other end of the first coil wiring, which is located inside the base body more than one end of the first coil wiring, and the end of the first inner lead wiring opposite to the first outer lead wiring are at the same height. <2> ~ <8> An inductor component as described in any of the following.

[0308] <10> The dimensions of the first lead wiring in the coil axis direction increase from the first external electrode side toward the first coil wiring side. <1> ~ <9> An inductor component as described in any of the following.

[0309] <11> The number of the first lead wires increases as you move from the first external electrode side towards the first coil wiring side. <1> ~ <9> An inductor component as described in any of the following.

[0310] <12> When viewed from a longitudinal direction perpendicular to the coil axis, the ends of the first lead wire and the ends of the first external electrode are offset from each other in the coil axis direction. <1> ~ <11> An inductor component as described in any of the following.

[0311] <13> When viewed from the length direction as described above, in the coil axis direction, one end of the first coil wiring and one end of the first lead wiring are located at different heights. When viewed from the length direction as described above, in the coil axis direction, the other end of the first coil wiring that is located inside the base body more than one end of the first coil wiring and the other end of the first lead wiring that is located inside the base body more than one end of the first lead wiring are at the same height. <12> The inductor components listed below.

[0312] <14> The first coil wiring and the first lead wiring are connected at a corner corresponding to the point where the first lead wiring begins to extend at an angle from the straight portion of the first coil wiring when viewed from the direction of the coil axis. <1> ~ <13> An inductor component as described in any of the following.

[0313] <15> The surface of the above-mentioned body includes a bottom surface parallel to the coil axis direction and a top surface opposite to the bottom surface in the height direction perpendicular to the coil axis direction. The first external electrode and the second external electrode are exposed so as to be separated from each other at least on the bottom surface of the base body. <1> ~ <14> An inductor component as described in any of the following.

[0314] <16> The surface of the above-mentioned body includes a bottom surface perpendicular to the coil axis direction and a top surface opposite to the bottom surface in the coil axis direction. The first external electrode and the second external electrode are exposed so as to be separated from each other at least on the bottom surface of the base body. <1> ~ <14> An inductor component as described in any of the following.

[0315] <17> The plurality of coil wirings further include a second coil wiring electrically connected to the second external electrode via at least one second lead wiring, The first lead wire is located on the top surface side of the base body in the coil axis direction, The dimensions of each of the above-mentioned first lead wires in the direction of the coil axis are smaller than the dimensions of each of the above-mentioned second lead wires in the direction of the coil axis. <16> The inductor components listed below.

[0316] <18> The base body and, A coil provided inside the above-mentioned base body and wound spirally along the coil axis, A first external electrode is electrically connected to one end of the above coil and is exposed on the surface of the above body, The device comprises a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, The above-mentioned base material includes an insulator, The above coil is made up of multiple coil wirings stacked in the direction of the coil axis and electrically connected, The plurality of coil wirings include a first coil wiring that is electrically connected to the first external electrode via at least one first lead wiring, An inductor component characterized in that, when viewed from a longitudinal direction perpendicular to the coil axis, both ends of the first lead wiring and both ends of the first external electrode are offset from each other in the coil axis direction.

[0317] <19> The base body and, A coil provided inside the above-mentioned base body and wound spirally along the coil axis, A first external electrode is electrically connected to one end of the above coil and is exposed on the surface of the above body, The device comprises a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, The above-mentioned base material includes an insulator, The surface of the above-mentioned body includes a bottom surface perpendicular to the coil axis direction and a top surface opposite to the bottom surface in the coil axis direction. The first external electrode and the second external electrode are exposed so as to be separated from each other at least on the bottom surface of the base body. The above coil is made up of multiple coil wirings stacked in the direction of the coil axis and electrically connected, The plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead wiring, and a second coil wiring electrically connected to the second external electrode via at least one second lead wiring. The first lead wire is located on the top surface side of the base body in the coil axis direction, An inductor component characterized in that, when viewed from a length direction perpendicular to the coil axis direction, the minimum distance between the end of the first lead wire and the end of the first external electrode in the width direction perpendicular to both the coil axis direction and the length direction is greater than the minimum distance between the end of the second lead wire and the end of the second external electrode.

[0318] <20> The first coil wiring is electrically connected to the first external electrode via one of the first lead wires. <1> The inductor components listed below.

[0319] <21> The dimension of the first inner lead wiring in the coil axis direction is smaller than the dimension of the first outer lead wiring in the coil axis direction. <4> The inductor components listed below.

[0320] <22> The distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction is greater than the distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction. <7> The inductor components listed below.

[0321] <23> The dimensions of each of the above-mentioned first lead wires in the direction of the coil axis are smaller than the dimensions of the above-mentioned first coil wires in the direction of the coil axis. <18> The inductor components listed below.

[0322] <24> The first coil wiring is electrically connected to the first external electrode via one of the first lead wires. <18> or <23> The inductor components listed below.

[0323] <25> The first coil wiring described above is electrically connected to the first external electrode via a plurality of first lead wires arranged in the direction of the coil axis. <18> or <23> The inductor components listed below.

[0324] <26> The dimensions of the multiple first lead wires in the coil axis direction are the same to one another. <25> The inductor components listed below.

[0325] <27> The plurality of first lead wires include a first outer lead wire and a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, The dimensions of the first outer lead wiring and the first inner lead wiring in the coil axis direction are different from each other. <25> The inductor components listed below.

[0326] <28> The dimension of the first outer lead wiring in the coil axis direction is smaller than the dimension of the first inner lead wiring in the coil axis direction. <27> The inductor components listed below.

[0327] <29> The dimension of the first inner lead wiring in the coil axis direction is smaller than the dimension of the first outer lead wiring in the coil axis direction. <27> The inductor components listed below.

[0328] <30> There are three or more of the above-mentioned first lead-out wirings. The spacing between the multiple first lead wires in the coil axis direction is the same. <25> ~ <29> An inductor component as described in any of the following.

[0329] <31> The plurality of first lead wires include a first outer lead wire, a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, and a first intermediate lead wire located adjacent to both the first outer lead wire and the first inner lead wire in the coil axis direction. The distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction, and the distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction, are different from each other. <25> ~ <29> An inductor component as described in any of the following.

[0330] <32> The distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction is greater than the distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction. <31> The inductor components listed below.

[0331] <33> The distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction is greater than the distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction. <31> The inductor components listed below.

[0332] <34> The plurality of first lead wires include a first outer lead wire and a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, When viewed from a longitudinal direction perpendicular to the coil axis, in the coil axis direction, one end of the first coil wiring and the end of the first outer lead wiring opposite to the first inner lead wiring are at the same height. When viewed from the length direction as described above, in the coil axis direction, the other end of the first coil wiring, which is located inside the base body more than one end of the first coil wiring, and the end of the first inner lead wiring opposite to the first outer lead wiring are at the same height. <25> ~ <33> An inductor component as described in any of the following.

[0333] <35> The dimensions of the first lead wiring in the coil axis direction increase from the first external electrode side toward the first coil wiring side. <18> , <23> ~ <34> An inductor component as described in any of the following.

[0334] <36> The number of the first lead wires increases as you move from the first external electrode side towards the first coil wiring side. <18> , <23> , <25> ~ <34> An inductor component as described in any of the following.

[0335] <37> When viewed from the length direction as described above, in the coil axis direction, one end of the first coil wiring and one end of the first lead wiring are located at different heights. When viewed from the length direction as described above, in the coil axis direction, the other end of the first coil wiring that is located inside the base body more than one end of the first coil wiring and the other end of the first lead wiring that is located inside the base body more than one end of the first lead wiring are at the same height. <18> , <23> ~ <36> An inductor component as described in any of the following.

[0336] <38> The first coil wiring and the first lead wiring are connected at a corner corresponding to the point where the first lead wiring begins to extend at an angle from the straight portion of the first coil wiring when viewed from the direction of the coil axis. <18> , <23> ~ <37> An inductor component as described in any of the following.

[0337] <39> The surface of the above-mentioned body includes a bottom surface parallel to the coil axis direction and a top surface opposite to the bottom surface in the height direction perpendicular to the coil axis direction. The first external electrode and the second external electrode are exposed so as to be separated from each other at least on the bottom surface of the base body. <18> , <23> ~ <38> An inductor component as described in any of the following.

[0338] <40> The surface of the above-mentioned body includes a bottom surface perpendicular to the coil axis direction and a top surface opposite to the bottom surface in the coil axis direction. The first external electrode and the second external electrode are exposed so as to be separated from each other at least on the bottom surface of the base body. <18> , <23> ~ <38> An inductor component as described in any of the following.

[0339] <41> The plurality of coil wirings further include a second coil wiring electrically connected to the second external electrode via at least one second lead wiring, The first lead wire is located on the top surface side of the base body in the coil axis direction, The dimensions of each of the above-mentioned first lead wires in the direction of the coil axis are smaller than the dimensions of each of the above-mentioned second lead wires in the direction of the coil axis. <40> The inductor components listed below.

[0340] <42> The dimensions of each of the above-mentioned first lead wires in the direction of the coil axis are smaller than the dimensions of the above-mentioned first coil wires in the direction of the coil axis. <19> The inductor components listed below.

[0341] <43> The first coil wiring is electrically connected to the first external electrode via one of the first lead wires. <19> or <42> The inductor components listed below.

[0342] <44> The first coil wiring described above is electrically connected to the first external electrode via a plurality of first lead wires arranged in the direction of the coil axis. <19> or <42> The inductor components listed below.

[0343] <45> The dimensions of the multiple first lead wires in the coil axis direction are the same to one another. <44> The inductor components listed below.

[0344] <46> The plurality of first lead wires include a first outer lead wire and a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, The dimensions of the first outer lead wiring and the first inner lead wiring in the coil axis direction are different from each other. <44> The inductor components listed below.

[0345] <47> The dimension of the first outer lead wiring in the coil axis direction is smaller than the dimension of the first inner lead wiring in the coil axis direction. <46> The inductor components listed below.

[0346] <48> The dimension of the first inner lead wiring in the coil axis direction is smaller than the dimension of the first outer lead wiring in the coil axis direction. <46> The inductor components listed below.

[0347] <49> There are three or more of the above-mentioned first lead-out wirings. The spacing between the multiple first lead wires in the coil axis direction is the same. <44> ~ <48> An inductor component as described in any of the following.

[0348] <50> The plurality of first lead wires include a first outer lead wire, a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, and a first intermediate lead wire located adjacent to both the first outer lead wire and the first inner lead wire in the coil axis direction. The distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction, and the distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction, are different from each other. <44> ~ <48> An inductor component as described in any of the following.

[0349] <51> The distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction is greater than the distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction. <50> The inductor components listed below.

[0350] <52> The distance between the first inner lead wiring and the first intermediate lead wiring in the coil axis direction is greater than the distance between the first outer lead wiring and the first intermediate lead wiring in the coil axis direction. <50> The inductor components listed below.

[0351] <53> The plurality of first lead wires include a first outer lead wire and a first inner lead wire located inside the base body in the coil axis direction relative to the first outer lead wire, When viewed from a longitudinal direction perpendicular to the coil axis, in the coil axis direction, one end of the first coil wiring and the end of the first outer lead wiring opposite to the first inner lead wiring are at the same height. When viewed from the length direction as described above, in the coil axis direction, the other end of the first coil wiring, which is located inside the base body more than one end of the first coil wiring, and the end of the first inner lead wiring opposite to the first outer lead wiring are at the same height. <44> ~ <52> An inductor component as described in any of the following.

[0352] <54> The dimensions of the first lead wiring in the coil axis direction increase from the first external electrode side toward the first coil wiring side. <19> , <42> ~ <53> An inductor component as described in any of the following.

[0353] <55> The number of the first lead wires increases as you move from the first external electrode side towards the first coil wiring side. <19> , <42> , <44> ~ <53> An inductor component as described in any of the following.

[0354] <56> When viewed from a longitudinal direction perpendicular to the coil axis, the ends of the first lead wire and the ends of the first external electrode are offset from each other in the coil axis direction. <19> , <42> ~ <55> An inductor component as described in any of the following.

[0355] <57> When viewed from the length direction as described above, in the coil axis direction, one end of the first coil wiring and one end of the first lead wiring are located at different heights. When viewed from the length direction as described above, in the coil axis direction, the other end of the first coil wiring that is located inside the base body more than one end of the first coil wiring and the other end of the first lead wiring that is located inside the base body more than one end of the first lead wiring are at the same height. <56> The inductor components listed below.

[0356] <58> The first coil wiring and the first lead wiring are connected at a corner corresponding to the point where the first lead wiring begins to extend at an angle from the straight portion of the first coil wiring when viewed from the direction of the coil axis. <19> , <42> ~ <57> An inductor component as described in any of the following.

[0357] <59> The dimensions of each of the above-mentioned first lead wires in the direction of the coil axis are smaller than the dimensions of each of the above-mentioned second lead wires in the direction of the coil axis. <19> , <42> ~ <58> An inductor component as described in any of the following. [Explanation of Symbols]

[0358] 1A, 1B, 1C, 1D, 1E, 1E', 1F, 2A, 3A Inductor Components 10 Base Body 11a, 11b End faces of the base body 12a Top surface of the base body 12b Bottom of the base body 13a, 13b Side view of the base body 15a, 15b, 15c, 15d, 15e, 15f, 15g Insulating layer 20, 50 coils 21a, 51a First coil wiring 21b, 51b Second coil wiring 22aa, 22aa', 22ab, 22ac, 22ad, 22ae, 22af, 52aa, 52aa' 1st extraction wiring 22ba, 22ba', 22bb, 22be, 22bf, 52ba, 52ba' Second lead wiring 23ae, 24ae, 23af, 24af, 25af Output wiring section 29a, 59a connecting conductors 30a 1st external electrode 30b 2nd external electrode 121aa, 121ab First coil conductor layer 121ba, 121bb Second coil conductor layer 122aa First Lead-Out Conductor Layer 122ba Second Lead-Out Conductor Layer 129aa Connecting conductor layer 130aa, 130ab, 130ac, 130ad, 130ae First outer conductor layer 130ba, 130bb, 130bc, 130bd, 130be Second outer conductor layer CA, CB coil shaft D Corner Section E21a One end of the first coil wiring E22aa, E22aa', F22aa, F22aa', F22ab, G22aa' End of first lead wire E30a, F30a, G30a End of the first external electrode F21a Other end of the first coil wiring L (Length direction) T (height direction) W (width direction) W21a Dimensions of the first coil wiring in the coil axis direction W22aa, W22ab, W22ac, W22ad Dimensions of the first lead wire in the coil axis direction W23ae, W24ae Dimensions of the lead wiring section in the coil axis direction Xa, Xb, Xc, Xd: Spacing between the first lead wires in the coil axis direction. Ya Minimum distance between the end of the first lead wire and the end of the first external electrode Yb Minimum distance between the end of the second lead wire and the end of the second external electrode

Claims

[Claim 1] The base body and, A coil provided inside the aforementioned body and wound spirally along the coil axis, A first external electrode is electrically connected to one end of the coil and exposed on the surface of the base body, The device comprises a second external electrode electrically connected to the other end of the coil and exposed on the surface of the base body, The aforementioned element includes an insulator, The surface of the body includes a bottom surface perpendicular to the coil axis direction and a top surface opposite to the bottom surface in the coil axis direction. The first external electrode and the second external electrode are exposed so as to be separated from each other at least on the bottom surface of the body, The coil is made up of multiple coil wirings stacked in the direction of the coil axis and electrically connected, The plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead wiring, and a second coil wiring electrically connected to the second external electrode via at least one second lead wiring, The first lead wire is located on the top surface side of the base body in the coil axial direction, An inductor component characterized in that, when viewed from a longitudinal direction perpendicular to the coil axis direction and such that the first external electrode and the second external electrode are spaced apart from each other, the minimum distance in the width direction between the end of the first lead wiring at the connection point with the first external electrode, perpendicular to the coil axis direction and the longitudinal direction, and the end of the first external electrode in the width direction, is greater than the minimum distance in the width direction between the end of the second lead wiring at the connection point with the second external electrode, and the end of the second external electrode in the width direction.

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