Inductor component

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

[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 steps of preparing a photosensitive insulating paste and a conductive paste containing a filler material made of quartz, a glass material, and a resin material; applying the insulating paste to form a first insulating layer; exposing the first insulating layer in a state where a first portion of the first insulating layer is shielded from light by a mask; removing the first portion of the first insulating layer to form a groove having a groove depth larger than a groove width at a position corresponding to the first portion; applying the conductive paste into the groove to form a coil conductor layer in the groove; and 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, since the aspect ratio and the cross-sectional area of the coil conductor layer can be increased, it is said that the coil characteristics can be improved.

[0005] However, as a result of investigations by the inventors, when attempting to form an inductor component having a coil wiring with a large aspect ratio or cross-sectional area as in Patent Document 1, during firing in the manufacturing process, a large stress tends to remain in the vicinity of the lead wiring that connects the coil wiring and the external electrode. Therefore, when further increasing the aspect ratio or cross-sectional area of the coil wiring or miniaturizing the inductor component, it was found that interface peeling between the lead wiring and the body (insulating layer) occurs starting from the remaining stress, and as a result, cracks can occur.

[0006] The present invention has been made to solve the above problems, and an object thereof is to provide an inductor component capable of suppressing the occurrence of cracks caused by stress remaining in the vicinity of the lead wiring during the manufacturing process.

Means for Solving the Problems

[0007] The inductor component of the present invention, in a first aspect, includes a body, a coil provided inside the 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 body, and a second external electrode electrically connected to the other end of the coil and exposed on the surface of the body. The body includes an insulator, the coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction, 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. The dimension of each first lead wiring in the coil axis direction is smaller than the dimension of the first coil wiring in the coil axis direction.

[0008] In a second aspect, the inductor component of the present invention includes a base body, a coil provided inside the base body and wound in a spiral shape 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. The base body includes an insulator, the coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction, 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. When viewed from the length direction orthogonal to the coil axis direction, in the coil axis direction, both ends of the first lead wiring and both ends of the first external electrode are offset from each other.

[0009] In a third aspect, the inductor component of the present invention includes a base body, a coil provided inside the base body and wound in a spiral shape 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. 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 to 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. The coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction. 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 wiring is located on the top surface side of the base body with respect to the second lead wiring in the coil axis direction. When viewed from the length direction orthogonal to the coil axis direction, in the width direction orthogonal to the coil axis direction and the length 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.

[0010] In the inductor component of the present invention, when viewed from the coil axis direction, in the path where the coil wiring is connected to the external electrode, the wiring that extends toward the external electrode while being inclined with respect to the straight portion of the coil wiring is defined as the lead-out wiring. In this case, when viewed from the coil axis direction, the coil wiring and the lead-out wiring do not exist on the same straight line with the connection portion between the two as the boundary. In addition, when viewed from the coil axis direction, if the wiring corresponding to the lead-out wiring defined as described above cannot be found, the wiring that does not overlap with the circumferential portion of the coil (protrudes from the circumferential portion of the coil) when viewed from the coil axis direction is defined as the lead-out wiring.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide an inductor component capable of suppressing the generation of cracks caused by stress remaining in the vicinity of the lead-out wiring during the manufacturing process.

Brief Description of the Drawings

[0012]

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MODE FOR CARRYING OUT THE INVENTION

[0013] Hereinafter, the inductor component of the present invention will be described. Note that the present invention is not limited to the following configurations, and may be appropriately changed without departing from the gist of the present invention. Also, a combination of a plurality of the individual preferred configurations described below is also the present invention.

[0014] Each of the following embodiments is an exemplification, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. In Embodiments 2 and later, descriptions of matters common to Embodiment 1 will be omitted, and different points will be mainly described. In particular, the same operational effects due to the same configurations will not be sequentially mentioned for each embodiment.

[0015] In the following description, when each embodiment is not particularly distinguished, it is simply referred to as "the inductor component of the present invention".

[0016] The drawings shown below are schematic diagrams, and their dimensions, scales of aspect ratios, etc. may differ from those of actual products.

[0017] In this specification, terms indicating the relationship between elements (e.g., "parallel", "perpendicular", "orthogonal", etc.) and terms indicating the shape of elements do not only mean the exact strict aspect, but also mean a substantially equivalent range, for example, a range including a difference of about several percent.

[0018] In a first aspect, the inductor component of the present invention includes 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. The base body includes an insulator, the coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction, 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 first lead wiring 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 the first aspect 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] FIG. 1 is a perspective schematic view showing an example of the inductor component of Embodiment 1 of the present invention.

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

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

[0023] As shown in FIG. 1, in the inductor component 1A, the surface of the element body 10 includes end faces 11a and 11b facing the length direction L, top faces 12a and bottom faces 12b facing the height direction T, and side faces 13a and 13b facing 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 element body 10 includes a bottom face 12b parallel to the coil axis direction and a top face 12a facing the bottom face 12b in the height direction T orthogonal to the coil axis direction.

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

[0025] In the inductor component 1A, the bottom face 12b of the element body 10 is a mounting surface. More specifically, the bottom face 12b of the element body 10 is a mounting surface that faces a mounting object (for example, a substrate) when the inductor component 1A is mounted. Therefore, in the inductor component 1A, the mounting surface of the element body 10, that is, the bottom face 12b of the element body 10 is parallel to the coil axis direction.

[0026] At least one of the surfaces of the element body 10, that is, at least one of the end faces 11a, 11b, top faces 12a, bottom faces 12b, side faces 13a, and side faces 13b may be marked to facilitate identification of each surface.

[0027] The end faces 11a and 11b of the element body 10 do not necessarily strictly intersect the length direction L. Also, the top faces 12a and bottom faces 12b of the element body 10 do not necessarily strictly intersect the height direction T. Further, the side faces 13a and 13b of the element body 10 do not necessarily strictly intersect the width direction W.

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

[0029] In this specification, the shape of a rectangular parallelepiped only needs to be a shape that can be substantially said to be a rectangular parallelepiped, and includes, for example, a substantially rectangular parallelepiped shape with rounded corners and edges 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 portions where three faces of the base body 10 intersect. The edge portions of the base body 10 are the portions where two faces of the base body 10 intersect.

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

[0032] The base body 10 includes an insulator. In the example shown in FIG. 2, the insulator is formed by laminating a plurality of insulating layers in the coil axis direction.

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

[0034] Note that the plurality of insulating layers may be integrated, and the boundaries between them may not be clearly visible.

[0035] Note that the plurality of insulating layers may further include at least one other insulating layer in addition to the insulating layers described above. For example, at least one insulating layer may exist between the insulating layer 15a and the insulating layer 15b in the coil axis direction. Also, at least one insulating layer may exist between the insulating layer 15f and the insulating layer 15g in the coil axis direction.

[0036] Examples of the insulating material that constitutes the insulator (insulating layer) include glass materials mainly composed of borosilicate glass, ceramic materials, organic materials such as epoxy resin, fluororesin, and polymer resin, and composite materials such as glass epoxy resin. As the insulating material, a material having particularly small dielectric constant and dielectric loss is preferable.

[0037] The insulating materials that constitute the plurality of insulating layers may be the same as each other, may be different from each other, or may be partially different.

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

[0039] As shown in FIG. 1, the coil 20 is provided inside the element body 10 and is wound in a spiral shape along the coil axis direction.

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

[0041] As shown in FIGS. 1 and 2, the coil 20 is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction.

[0042] In the example shown in FIGS. 1 and 2, the plurality of 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 of the side surface 13a of the element body 10 in the coil axis direction among the plurality of coil wirings.

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

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

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

[0047] Among the plurality of coil wirings, the second coil wiring 21b is located at the outermost position on the side surface 13b side of the element body 10 in the coil axis direction.

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

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

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

[0051] Note that at least one other coil wiring may be present between the first coil wiring 21a and the second coil wiring 21b in the coil axis direction.

[0052] Examples of the conductive material constituting the coil wiring include Ag, Au, Cu, Pd, Ni, Al, alloys containing at least one of these metals, and the like.

[0053] The conductive materials constituting the plurality of coil wirings may be the same as each other, different from each other, or partially different from each other.

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

[0055] For a plurality of coil wirings, the dimensions in a direction orthogonal to the direction in which the coil wiring extends when viewed from the coil axis direction, that is, the widths when viewed from the coil axis direction, may be the same as each other, may be different from each other, or may be partially different.

[0056] Among the plurality of coil wirings, the coil wirings adjacent to each other in the coil axis direction may be electrically connected via a connection conductor that penetrates an insulating layer between the adjacent coil wirings in the coil axis direction. That is, the coil 20 may be formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction via a connection conductor.

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

[0058] In the example shown in FIG. 2, the connection conductor 29a is composed of a connection conductor layer 129aa.

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

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

[0061] Examples of the conductive material constituting the connection conductor include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0062] Note that, as described 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. That is, the coil 20 may be composed of three or more coil wirings with at least one coil wiring added to the first coil wiring 21a and the second coil wiring 21b. However, by adjusting the position of the connection conductor, it is possible to configure the coil 20 with only the first coil wiring 21a and the second coil wiring 21b.

[0063] When viewed from the coil axis direction, the coil 20 may have a shape composed only of straight portions, a shape composed only of curved portions, or a shape composed of straight portions and curved portions. For example, when viewed from the coil axis direction, the coil 20 may have, for example, a polygonal shape, a circular shape, or an elliptical shape.

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

[0065] In the example shown in FIG. 2, the first lead wiring 22aa is composed of a first lead conductor layer 122aa.

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

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

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

[0069] In the example shown in FIG. 2, the second lead wiring 22ba is composed 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 axis direction.

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

[0072] Examples of the conductive material constituting the lead wiring include Ag, Au, Cu, Pd, Ni, Al, alloys containing at least one of these metals, and the like.

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

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

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

[0076] In the example shown in FIG. 1, the first external electrode 30a extends from a part of the bottom surface 12b of the element body 10 to a part of the end surface 11a. That is, in the example shown in FIG. 1, the first external electrode 30a is exposed not only on a part of the bottom surface 12b of the element body 10 but also on a part of the end surface 11a of the element body 10.

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

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

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

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

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

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

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

[0084] Note that 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 FIG. 2, the second external electrode 30b is formed by laminating a second external conductor layer 130ba, a second external conductor layer 130bb, a second external conductor layer 130bc, a second external conductor layer 130bd, and a second external conductor layer 130be in the coil axis direction.

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

[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 element body 10. In the example shown in FIG. 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 orthogonal to the coil axis direction (here, the length direction L).

[0089] In addition, when the first external electrode 30a and the second external electrode 30b are each exposed on the bottom surface 12b of the element body 10 which is the mounting surface, the mountability of the inductor component 1A is likely to be improved.

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

[0091] Note that the dimension of the first external electrode 30a in the coil axis direction may be the same as the dimension of the element body 10 in the coil axis direction.

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

[0093] Note that the dimension of the second external electrode 30b in the coil axis direction may be the same as the dimension of the element body 10 in the coil axis direction.

[0094] Examples of the conductive material constituting the external electrode 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 above-described conductive material (e.g., Ag), a Ni-plated electrode, and a Sn-plated electrode. In this case, in the first external electrode 30a, the base electrode forms an integrated surface with the surface of the element body 10 (in FIG. 1, the end face 11a and the bottom face 12b of the element body 10), and the Ni-plated electrode and the Sn-plated electrode may bulge from the surface of the element body 10 (in FIG. 1, the end face 11a and the bottom face 12b of the element 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 above-described conductive material (e.g., Ag), a Ni-plated electrode, and a Sn-plated electrode. In this case, in the second external electrode 30b, the base electrode forms an integrated surface with the surface of the element body 10 (in FIG. 1, the end face 11b and the bottom face 12b of the element body 10), and the Ni-plated electrode and the Sn-plated electrode may bulge from the surface of the element body 10 (in FIG. 1, the end face 11b and the bottom face 12b of the element 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 as each other or different from each other.

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

[0099] As shown in FIG. 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 the inductor component 1A, since 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, the stress remaining in the vicinity of the first lead wiring 22aa during firing in the manufacturing process is suppressed. Therefore, in the inductor component 1A, the interfacial peeling between the first lead wiring 22aa and the element body 10 due to the stress remaining in the vicinity of the first lead wiring 22aa is suppressed, and as a result, the occurrence of cracks is suppressed.

[0101] On the other hand, in the inductor component, particularly on the surface of the element body, during the manufacturing process, for example, an impact load due to the collision of an abrasive material or the like is applied during a polishing process (e.g., barrel polishing process) for rounding the corners and ridges of the element body, or a chemical erosion load due to the penetration of a plating solution is applied during a plating process for forming an external electrode. Therefore, in the inductor component, during the manufacturing process, while such external loads as the impact load and the chemical erosion load serve as triggers, the stress remaining in the vicinity of the lead wiring during firing also contributes, making it easier for interfacial peeling between the lead wiring and the element body to occur, and as a result, there is a risk of cracks occurring more easily. In contrast, in the inductor component 1A, since 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, the stress remaining in the vicinity of the first lead wiring 22aa during firing in the manufacturing process is suppressed. Therefore, even when external loads such as the above-described impact load and chemical erosion load are applied to the inductor component 1A, it becomes less likely for interfacial peeling between the first lead wiring 22aa, which is triggered by the external load, and the element body 10 to occur, and as a result, it becomes less likely for cracks to occur.

[0102] From the above, according to the inductor component 1A, an inductor component capable of suppressing the occurrence of cracks due to the stress remaining in the vicinity of the first lead wiring 22aa during the manufacturing process can be realized.

[0103] According to the inductor component 1A, since the stress remaining in the vicinity of the first lead wiring 22aa during firing in the manufacturing process can be suppressed, even if at least one of the aspect ratio and the cross-sectional area of the coil wiring (for example, the first coil wiring 21a) is increased to improve the coil characteristics, the occurrence of cracks can be suppressed.

[0104] The first lead wiring 22aa only needs to have at least a part of a portion whose dimension in the coil axis direction is smaller than that of the first coil wiring 21a. That is, the first lead wiring 22aa may have a portion whose dimension in the coil axis direction is smaller than that of the first coil wiring 21a over a part of the first lead wiring 22aa in the direction in which the first lead wiring 22aa extends, or may have it over the entire first lead wiring 22aa.

[0105] The dimension of the coil wiring in the coil axis direction is defined as the maximum dimension in the coil axis direction in a cross-section perpendicular to the direction in which the coil wiring extends. Even when the outer shape of the coil wiring is uneven when looking at the above cross-section of the coil wiring, the dimension of the coil wiring in the coil axis direction is defined as the maximum dimension in the coil axis direction in a state including the unevenness.

[0106] The dimension of the lead wiring in the coil axis direction is defined as the maximum dimension in the coil axis direction in a cross-section perpendicular to the direction in which the lead wiring extends. Even when the outer shape of the lead wiring is uneven when looking at the above cross-section of the lead wiring, the dimension of the lead wiring in the coil axis direction is defined as the maximum dimension in the coil axis direction in a state including the unevenness. When the dimension of the lead wiring in the coil axis direction is partially different along the direction in which the lead wiring extends (for example, refer to Embodiment 3 described later), for each portion where the dimension of the lead wiring in the coil axis direction is different, the above cross-section of the lead wiring is defined.

[0107] As shown in FIG. 1, it is preferable that the first coil wiring 21a and the first lead-out wiring 22aa are connected at a corner portion D corresponding to a location where the first lead-out wiring 22aa starts to extend while being inclined from the linear portion of the first coil wiring 21a when viewed from the coil axis direction.

[0108] In the inductor component 1A, since the first coil wiring 21a and the first lead-out wiring 22aa are connected at the corner portion, the first coil wiring 21a and the first lead-out wiring 22aa, which has a smaller dimension in the coil axis direction than the first coil wiring 21a, are connected at the corner portion where stress is likely to remain during firing in the manufacturing process. Therefore, the stress remaining in the corner portion is suppressed. For this reason, in the inductor component 1A, even when an external load is applied to the top surface 12a of the element body 10, peeling at the interface between the first lead-out wiring 22aa triggered by the external load and the element body 10 is suppressed, and as a result, the occurrence of cracks is suppressed.

[0109] In this specification, when viewed from the coil axis direction, in the path where the coil wiring is connected to the external electrode, a wiring that extends toward the external electrode while being inclined with respect to the linear portion of the coil wiring is defined as the lead-out wiring (for example, the example shown in FIG. 1). In this case, when viewed from the coil axis direction, the coil wiring and the lead-out wiring do not exist on the same straight line with the connection portion between the two as the boundary. In addition, when viewed from the coil axis direction, if a wiring corresponding to the lead-out wiring defined as described above cannot be found, a wiring that does not overlap the circumferential portion of the coil (protrudes from the circumferential portion of the coil) is defined as the lead-out wiring (for example, an example different from FIG. 1).

[0110] As shown in FIG. 1, in the inductor component 1A, the second coil wiring 21b may be electrically connected to the second external electrode 30b via one second lead-out wiring 22ba. In this case, as shown in FIG. 1, it is preferable that the dimension of the second lead-out 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] The inductor component 1A is manufactured, for example, by the following method.

[0113] <Step of manufacturing a mother laminate> First, for example, an insulating paste containing a glass material mainly composed of borosilicate glass or the like is repeatedly applied by screen printing or the like to form an insulating paste layer that will later become the insulating layer 15a.

[0114] Next, for example, a photosensitive conductive paste mainly composed of Ag or the like is applied by screen printing or the like to form a photosensitive conductive paste layer on the insulating paste layer. Further, after irradiating the photosensitive conductive paste layer with ultraviolet light or the like through a photomask, development is performed with an alkaline solution or the like, whereby a coil conductor layer that will later become the second coil conductor layer 121ba, an external conductor layer that will later become the first external conductor layer 130aa and the second external conductor layer 130ba, and a lead conductor layer that will later become the second lead conductor layer 122ba and is connected to the coil conductor layer and the external conductor layer are formed at a plurality of locations on the insulating paste layer.

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

[0116] Next, for example, by applying a photosensitive insulating paste by screen printing or the like, an insulating paste layer that will later become the insulating layer 15b and the insulating layer 15c is formed on the insulating paste layer that will later become the insulating layer 15a. Further, after irradiating the insulating paste layer that will later become the insulating layer 15c with ultraviolet rays or the like through 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 the insulating layer 15c. The via holes formed here partially overlap with the coil conductor layer that will later become the second coil conductor layer 121ba, do not overlap with the lead-out conductor layer that will later become the second lead-out 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 with the external conductor layers that will later become the first external conductor layer 130aa and the second external conductor layer 130ba.

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

[0118] Next, for example, by applying a photosensitive conductive paste containing Ag or the like as a main metal component by screen printing or the like, a new photosensitive conductive paste layer is formed inside the via holes and openings while being formed on the insulating paste layer that will later become the insulating layer 15c. Further, after irradiating the photosensitive conductive paste layer with ultraviolet rays or the like through a photomask, and then developing it with an alkaline solution or the like, a coil conductor layer that will later become the second coil conductor layer 121bb is formed inside the via holes, and a connection conductor layer that will later become the connection conductor layer 129aa and is connected to this coil conductor layer is formed. Further, while forming an external conductor layer that will later become the first external conductor layer 130ab and is connected to the external conductor layer that will later become the first external conductor layer 130aa inside the opening, an external conductor layer that will later become the first external conductor layer 130ac is formed on this external conductor layer. Further, while forming an external conductor layer that will later become the second external conductor layer 130bb and is connected to the external conductor layer that will later become the second external conductor layer 130ba inside the opening, an external conductor layer that will later become the second external conductor layer 130bc is formed on this external conductor layer.

[0119] In addition, when forming the coil conductor layer, the connection conductor layer, and the external conductor layer, instead of exposure using a photomask, for example, DI exposure without using a photomask may be performed.

[0120] Next, for example, by applying a photosensitive insulating paste by screen printing or the like, an insulating paste layer that will later become the insulating layer 15d and the insulating layer 15e is formed on the insulating paste layer that will later become the insulating layer 15c. Further, after irradiating the insulating paste layer that will later become the insulating layer 15e with ultraviolet rays or the like through a photomask, development is performed with an alkaline solution or the like to form via holes and openings in the insulating paste layer that will later become the insulating layer 15e. The via holes formed here overlap the connection conductor layer that will later become the connection 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 the external conductor layers that will later become the first external conductor layer 130ac and the second external conductor layer 130bc.

[0121] Next, for example, a photosensitive conductive paste containing Ag or the like as a main metal component is applied by screen printing or the like to form a new photosensitive conductive paste layer inside the via hole and the opening, and at the same time, it is formed on the insulating paste layer that will later become the insulating layer 15e. Further, after irradiating the photosensitive conductive paste layer with ultraviolet rays or the like through a photomask, and then developing it with an alkaline solution or the like, a coil conductor layer that will later become the first coil conductor layer 121aa is formed inside the via hole, and a coil conductor layer that will later become the first coil conductor layer 121ab and is connected to this coil conductor layer is formed. Further, while forming an external conductor layer that will later become the first external conductor layer 130ad and is connected to the external conductor layer that will later become the first external conductor layer 130ac inside the opening, an external conductor layer that will later become the first external conductor layer 130ae is formed on this external conductor layer. Further, while forming an external conductor layer that will later become the second external conductor layer 130bd and is connected to the external conductor layer that will later become the second external conductor layer 130bc inside the opening, an external conductor layer that will later become the second external conductor layer 130be is formed on this external conductor layer. Further, a lead-out conductor layer that will later become the first lead-out conductor layer 122aa and is connected to the coil conductor layer that will later become the first coil conductor layer 121ab and the external conductor layer that will later become the first external conductor layer 130ae is formed on the insulating paste layer that will later become the insulating layer 15e.

[0122] Finally, for example, by repeating the application of an insulating paste containing a glass material mainly composed of borosilicate glass or the like by screen printing or the like, insulating paste layers that will later become the insulating layer 15f and the insulating layer 15g are formed.

[0123] Thus, the mother laminate is manufactured.

[0124] The method for forming the conductor patterns of the coil conductor layer, lead-out conductor layer, connection conductor layer, and external conductor layer is not limited to the photolithography method described above. For example, it may be a method of printing and laminating a conductive paste using a screen printing plate provided with an opening in the shape of the conductor pattern, or a method of forming a conductor film by a sputtering method, vapor deposition method, method of crimping a foil, etc., and then etching the conductor film so as to have the shape of the conductor pattern. It may also be a method of forming a negative pattern by a semi-additive method, then forming a plating film, and then removing unnecessary portions of the plating film by etching or the like so as to have the shape of the conductor pattern.

[0125] When forming the conductor patterns of the coil conductor layer, lead-out conductor layer, connection conductor layer, and external conductor layer, by forming the conductor patterns in multiple stages to achieve a high aspect ratio, the loss due to resistance at high frequencies can be reduced. The method of forming the conductor patterns in multiple stages is not particularly limited. For example, it may be a method of repeatedly stacking the conductor patterns by repeating the process using the photolithography method as described above, or a method of repeatedly stacking the conductor patterns formed by the semi-additive method, or a method of stacking the conductor patterns formed by the semi-additive method and the conductor patterns formed by etching a separately electroplated plating film in any order, or a method of further electroplating the plating film formed by the semi-additive method.

[0126] The conductive material constituting the conductor patterns of the coil conductor layer, lead-out conductor layer, connection conductor layer, and external conductor layer is not limited to the photosensitive conductive paste having Ag or the like as the main metal component described above. For example, it may be a conductor containing metals such as Ag, Au, and Cu formed by a sputtering method, vapor deposition method, method of crimping a foil, electroplating method, or the like.

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

[0128] The method of forming the insulating paste layer provided with via holes and openings is not limited to the photolithography method described above. For example, after forming an insulating film by a method such as pressing a sheet made of an insulating material, spin-coating an insulating material, or spray-coating an insulating material, a method of providing via holes and openings by performing laser processing, drill processing, etc. on the insulating film may also be used.

[0129] The insulating material constituting the insulating paste layer is not limited to the glass material mainly composed of the borosilicate glass described above. For example, it may be a ceramic material, an organic material such as an epoxy resin, a fluororesin, a polymer resin, or a composite material such as a glass epoxy resin. As the insulating material, a material having particularly small dielectric constant and dielectric loss is preferable.

[0130] <Process of forming a base body, a coil, and an external electrode> First, the mother laminate is cut by dicing or the like to be separated into a plurality of unfired laminates.

[0131] The unfired laminate has an insulating paste laminated portion where an insulating paste layer is laminated, a coil conductor laminated portion where coil conductor layers are laminated so that adjacent coil conductor layers are electrically connected via a connection conductor layer, and an external conductor laminated portion where an external conductor layer is laminated.

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

[0133] Next, the unfired laminate is fired to produce a laminate.

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

[0135] Next, for example, the obtained laminate may be subjected to barrel polishing treatment to round the corners and ridges of the base body 10.

[0136] Finally, using the two external conductor laminate portions after firing as base electrodes, Ni plating electrodes and Sn plating electrodes are sequentially formed on the surfaces of the respective base electrodes by plating. The thicknesses of the Ni plating electrode and the Sn plating electrode are, for example, 2 μm or more and 10 μm or less, respectively.

[0137] In this way, the first external electrode 30a and the second external electrode 30b having the base electrode, the Ni plating electrode, and the Sn plating electrode in this order from the surface side of the base body 10 are formed. In this case, in the first external electrode 30a, the base electrode forms an integral surface with the surface of the base body 10 (in FIG. 1, the end face 11a and the bottom face 12b of the base body 10), and the Ni plating electrode and the Sn plating electrode may bulge from the surface of the base body 10 (in FIG. 1, the end face 11a and the bottom face 12b of the base body 10) so as to cover the base electrode. Also, in the second external electrode 30b, the base electrode forms an integral surface with the surface of the base body 10 (in FIG. 1, the end face 11b and the bottom face 12b of the base body 10), and the Ni plating electrode and the Sn plating electrode may bulge from the surface of the base body 10 (in FIG. 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 of forming the external electrode is not limited to the method of performing a plating process on the external conductor laminated portion exposed on the cut surface of the unfired laminate (for example, the bottom surface of at least the insulating paste laminated portion) as described above. For example, after exposing the external conductor laminated portion on the cut surface of the unfired laminate (for example, the bottom surface of at least the insulating paste laminated portion) as described above, the exposed portion of the external conductor laminated portion may be immersed (dipped) in the conductive paste, or a conductive paste may be formed on the exposed portion of the external conductor laminated portion by sputtering, and then a plating process may be performed.

[0139] Thus, the inductor component 1A is manufactured.

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

[0141] [Embodiment 2] In the inductor component according to 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 coil axis direction. The inductor component according to Embodiment 2 of the present invention is the same as the inductor component according to Embodiment 1 of the present invention except for this point.

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

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

[0144] FIG. 5 is a cross-sectional schematic view showing an example of a cross section along the line segment b1 - b2 of the inductor component shown in FIG. 4. More specifically, FIG. 5 shows a cross section of the inductor component 1B including 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 FIG. 5, the dimension W22aa of the first lead wiring 22aa in the coil axis direction and the dimension W22ab of the first lead wiring 22ab in the coil axis direction are each smaller than the dimension W21a of the first coil wiring 21a in the coil axis direction.

[0146] In FIGS. 4 and 5, an example of a configuration in which two first lead wirings are arranged in the coil axis direction is shown, but three or more first lead wirings may be arranged in the coil axis direction. Hereinafter, examples of configurations in which three or four first lead wirings are arranged in the coil axis direction will be shown.

[0147] FIG. 6 is a cross-sectional schematic view showing an example of a configuration in which three first lead wirings are arranged in the coil axis direction with respect to the configuration shown in FIG. 5.

[0148] As shown in FIG. 6, as the three first lead wirings, in addition to the first lead wiring 22aa and the first lead wiring 22ab, a first lead wiring 22ac located between the first lead wiring 22aa and the first lead wiring 22ab in the coil axis direction is provided.

[0149] As shown in FIG. 6, the dimension W22aa of the first lead wiring 22aa in the coil axis direction, the dimension W22ab of the first lead wiring 22ab in the coil axis direction, and the dimension 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] FIG. 7 is a cross-sectional schematic view showing an example of a configuration in which four first lead wirings are arranged in the coil axis direction with respect to the configuration shown in FIG. 6.

[0151] As shown in FIG. 7, as the four first lead wirings, in addition to the first lead wiring 22aa, the first lead wiring 22ab, and the first lead wiring 22ac, a first lead wiring 22ad located between the first lead wiring 22ab and the first lead wiring 22ac in the coil axis direction is provided.

[0152] As shown in FIG. 7, the dimension W22aa of the first lead wiring 22aa in the coil axis direction, the dimension W22ab of the first lead wiring 22ab in the coil axis direction, the dimension W22ac of the first lead wiring 22ac in the coil axis direction, and the dimension 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 (for example, 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 coil axis direction, compared with an inductor component (for example, inductor component 1A) in which the first coil wiring 21a is electrically connected to the first external electrode 30a via one first lead wiring, an increase in the DC resistance (Rdc) is suppressed.

[0154] As shown in FIGS. 5, 6, and 7, it is preferable that the dimensions of the plurality of first lead wirings in the coil axis direction are the same as each other.

[0155] In the example shown in FIG. 5, the dimension W22aa of the first lead wiring 22aa in the coil axis direction and the dimension W22ab of the first lead wiring 22ab in the coil axis direction are the same as each other.

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

[0157] In the example shown in FIG. 7, the dimension W22aa of the first lead wiring 22aa in the coil axis direction, the dimension W22ab of the first lead wiring 22ab in the coil axis direction, the dimension W22ac of the first lead wiring 22ac in the coil axis direction, and the dimension W22ad of the first lead wiring 22ad in the coil axis direction are the same as each other.

[0158] As described above, in an inductor component in which the dimensions of a plurality of first lead-out wirings in the coil axis direction are the same as each other, an increase in DC resistance is suppressed as compared with an inductor component in which the dimensions of the plurality of first lead-out wirings in the coil axis direction are different from each other or partially different. Further, in an inductor component in which the dimensions of a plurality of first lead-out wirings in the coil axis direction are the same as each other, formation of the plurality of first lead-out wirings becomes easy, and pattern design of the coil 20 becomes easy.

[0159] The dimensions of the plurality of first lead-out wirings in the coil axis direction may be different from each other or partially different.

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

[0161] As shown in FIGS. 8 and 9, the first lead-out wiring 22aa is located closer to the surface side of the base body 10 (see FIG. 4) than the first lead-out wiring 22ab in the coil axis direction. Hereinafter, the first lead-out wiring 22aa is taken as an example of the first outer lead-out wiring in the inductor component of the present invention.

[0162] As shown in FIGS. 8 and 9, the first lead-out wiring 22ab is located closer to the inside of the base body 10 (see FIG. 4) than the first lead-out wiring 22aa in the coil axis direction.

[0163] In this specification, that one wiring is located closer to the inside of the base body than the other wiring means that, with respect to the same surface of the base body, the distance in the coil axis direction between one wiring and the surface of the base body is greater than the distance in the coil axis direction between the other wiring and the surface of the base body. More specifically, that one wiring is located closer to the inside of the base body than the other wiring means that, in the coil axis direction, the minimum distance between one wiring and the surface of the base body is greater than the minimum distance between the other wiring and the surface of the base body.

[0164] That is, as shown in FIGS. 8 and 9, the first lead wiring 22ab is larger in distance from the surface of the element body 10 (see FIG. 4) (in FIG. 4, the side surface 13a) than the first lead wiring 22aa in the coil axis direction. Hereinafter, the first lead wiring 22ab is taken as an example of the first inner lead wiring in the inductor component of the present invention.

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

[0166] In the example shown in FIG. 8, 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.

[0167] In the example shown in FIG. 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] FIG. 10 is a schematic cross-sectional view showing a modified example of the configuration shown in FIG. 6.

[0169] As shown in FIG. 10, the first lead wiring 22ac is positioned adjacent to both the first lead wiring 22aa and the first lead wiring 22ab in the coil axis direction. Hereinafter, the first lead wiring 22ac is taken as an example of the first intermediate lead wiring in the inductor component of the present invention.

[0170] As shown in FIG. 10, the dimension W22aa of the first lead wiring 22aa in the coil axis direction, the dimension W22ab of the first lead wiring 22ab in the coil axis direction, and the dimension W22ac of the first lead wiring 22ac in the coil axis direction may be partially different.

[0171] In the example shown in FIG. 10, the dimension W22ab of the first lead wiring 22ab in the coil axis direction and the dimension W22ac of the first lead wiring 22ac in the coil axis direction are the same as each other. On the other hand, 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 and the dimension W22ac of the first lead wiring 22ac in the coil axis direction.

[0172] As described above, in an inductor component in which the dimensions of a plurality of first lead wirings in the coil axis direction are different from each other or partially different, among the stresses remaining in the vicinity of the first lead wiring during firing in the manufacturing process, the stress in the path where an external load (particularly, a chemical erosion load) is applied is likely to be suppressed.

[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 close to the surface (here, the side surface 13a) of the element 10 to which an external load (particularly, a chemical erosion load) is likely to be applied becomes smaller. Therefore, the stress remaining in the vicinity of the first lead wiring 22aa during firing in the manufacturing process is suppressed, and particularly, the stress in the path where an external load (particularly, a chemical erosion load) is applied among the vicinity of the first lead wiring 22aa is likely to be suppressed.

[0174] Also, 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, it becomes easier to ensure good coil characteristics.

[0175] As shown in FIGS. 6 and 7, when there are three or more first lead wirings, it is preferable that the intervals of the plurality of first lead wirings in the coil axis direction are the same as each other.

[0176] In the example shown in FIG. 6, the interval Xa in the coil axis direction between the first lead wiring 22aa and the first lead wiring 22ac, and the interval Xb in the coil axis direction between the first lead wiring 22ab and the first lead wiring 22ac are the same as each other.

[0177] In the example shown in FIG. 7, the interval Xa in the coil axis direction between the first lead wiring 22aa and the first lead wiring 22ac, the interval Xc in the coil axis direction between the first lead wiring 22ac and the first lead wiring 22ad, and the interval Xd in the coil axis direction between the first lead wiring 22ab and the first lead wiring 22ad are the same as each other.

[0178] As described above, in an inductor component in which the intervals in the coil axis direction of a plurality of first lead wirings are the same as each other, compared with an inductor component in which the intervals in the coil axis direction of the plurality of first lead wirings are different from each other or partially different, during firing in the manufacturing process, among the stresses remaining in the vicinity of the first lead wiring, the stress in the path to which an external load (particularly, a chemical erosion load) is applied is suppressed. Further, in an inductor component in which the intervals in the coil axis direction of a plurality of first lead wirings are the same as each other, the formation of the plurality of first lead wirings becomes easy, and the degree of freedom in the pattern design of the coil 20 increases.

[0179] The intervals in the coil axis direction of the plurality of first lead wirings may be different from each other or partially different.

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

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

[0182] In the example shown in FIG. 11, the interval Xa in the coil axis direction between the first lead wiring 22aa and the first lead wiring 22ac is larger than the interval Xb in the coil axis direction between the first lead wiring 22ab and the first lead wiring 22ac.

[0183] In the example shown in FIG. 12, the interval Xb in the coil axis direction between the first lead wiring 22ab and the first lead wiring 22ac is larger than the interval Xa in the coil axis direction between the first lead wiring 22aa and the first lead wiring 22ac.

[0184] As described above, in an inductor component in which the intervals in the coil axis direction of a plurality of first lead wirings are different from each other or partly different, during firing in the manufacturing process, among the stresses remaining in the vicinity of the first lead wiring, the stress in the path to which an external load (particularly, a chemical erosion load) is applied is likely to be suppressed.

[0185] In this case, when the interval Xa in the coil axis direction between the first lead wiring 22aa and the first lead wiring 22ac is larger than the interval Xb in the coil axis direction between the first lead wiring 22ab and the first lead wiring 22ac, the concentration of the lead wiring in the region close to the surface of the base body 10 (here, the side surface 13a) is suppressed. Therefore, during firing in the manufacturing process, in the region close to the surface of the base body 10 (here, the side surface 13a), the stress remaining in the vicinity of the lead wiring (particularly, the first lead wiring 22aa) is suppressed.

[0186] Also, when the interval Xb in the coil axis direction between the first lead wiring 22ab and the first lead wiring 22ac is larger than the interval Xa in the coil axis direction between the first lead wiring 22aa and the first lead wiring 22ac, good coil characteristics are likely to be ensured.

[0187] The interval in the coil axis direction between two lead wirings is defined as the distance in the coil axis direction between the outermost end on the other lead wiring side in the cross section of one lead wiring whose dimension in the above-described coil axis direction is defined, and the outermost end on the one lead wiring side in the cross section of the other lead wiring whose dimension in the above-described coil axis direction is defined.

[0188] As shown in FIGS. 5, 6, 7, 8, 9, 10, 11, and 12, when viewed from the length direction L orthogonal to the coil axis direction, in the coil axis direction, one end portion of the first coil wiring 21a (here, the end portion on the side surface 13a side of the element body 10) E21a and the first lead wiring 22aa The end portion on the side opposite to the first lead wiring 22ab (here, the end portion on the side surface 13a side of the element body 10) E22aa are preferably located at the same height. Further, as shown in FIGS. 5, 6, 7, 8, 9, 10, 11, and 12, when viewed from the length direction L, in the coil axis direction, the other end portion of the first coil wiring 21a located inside the element body 10 than one end portion of the first coil wiring 21a (here, the end portion on the side surface 13a side of the element body 10) E21a (here, the end portion on the side surface 13b side of the element body 10) F21a, that is, the distance from the surface of the element body 10 (here, the side surface 13a) is larger than one end portion of the first coil wiring 21a (here, the end portion on the side surface 13a side of the element body 10) E21a The other end portion of the first coil wiring 21a (here, the end portion on the side surface 13b side of the element body 10) F21a and the end portion on the side opposite to the first lead wiring 22aa of the first lead wiring 22ab (here, the side surface 13b side of the element body 10) F22ab are preferably located at the same height.

[0189] As described above, in the inductor component where the first lead wiring 22aa and the first lead wiring 22ab are as far apart as possible in the coil axis direction, the locations where stress remains during firing in the manufacturing process are dispersed, so that an increase in stress locally is suppressed.

[0190] As shown in FIG. 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. That is, 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 forms of the plurality of second lead-out wirings are preferably the same as those of the plurality of first lead-out wirings described above.

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

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

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

[0195] The first lead-out wiring 22ae has a lead-out wiring portion 23ae and a lead-out wiring portion 24ae.

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

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

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

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

[0200] As shown in FIGS. 13, 14, and 15, the dimension of the first lead wiring 22ae in the coil axis direction increases from the first external electrode 30a side toward the first coil wiring 21a side.

[0201] In the examples shown in FIGS. 14 and 15, the dimension of the first lead wiring 22ae in the coil axis direction gradually increases from the dimension W23ae of the lead wiring portion 23ae in the coil axis direction to the dimension W24ae of the lead wiring portion 24ae in the coil axis direction as it goes from the first external electrode 30a side toward the first coil wiring 21a side. That is, in the examples shown in FIGS. 14 and 15, the dimension of the first lead wiring 22ae in the coil axis direction increases in two steps as it goes from the first external electrode 30a side toward the first coil wiring 21a side.

[0202] Note that the dimension of the first lead wiring 22ae in the coil axis direction may increase in three or more steps as it goes from the first external electrode 30a side toward the first coil wiring 21a side.

[0203] In the examples shown in FIGS. 13, 14, and 15, the outer shape of the first lead wiring 22ae when viewed from the height direction T is stepped on the side surface 13b side of the base body 10 so that the dimension in the coil axis direction gradually increases as it goes from the first external electrode 30a side toward the first coil wiring 21a side.

[0204] Note that the outer shape of the first lead wiring 22ae when viewed from the height direction T may be stepped on the side surface 13a side of the base body 10 so that the dimension in the coil axis direction gradually increases as it goes from the first external electrode 30a side toward the first coil wiring 21a side, or may be stepped on both the side surface 13a side and the side surface 13b side of the base body 10.

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

[0206] For example, when viewed from the height direction T, the outer shape of the first lead wiring 22ae may be linearly inclined on the side surface 13b side of the base body 10 so as to gradually increase from the first external electrode 30a side toward the first coil wiring 21a side, or may be linearly inclined on the side surface 13a side of the base body 10, or may be linearly inclined on both the side surface 13a side and the side surface 13b side of the base body 10, or may be curved on the side surface 13b side of the base body 10, or may be curved on the side surface 13a side of the base body 10, or may be curved on both the side surface 13a side and the side surface 13b side of the base body 10, or may have a shape combining a plurality of these.

[0207] As described above, in an inductor component in which 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, concentration of current in the first lead wiring is suppressed.

[0208] As shown in FIG. 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 FIG. 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 aspects of the second lead wiring 22be are preferably the same as those of the first lead wiring 22ae described above.

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

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

[0212] In the inductor component 1D shown in FIG. 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 wiring 22af has a lead wiring portion 23af, a lead wiring portion 24af, and a lead wiring portion 25af.

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

[0215] The lead wiring portion 24af is provided between the lead wiring portion 23af and the first coil wiring 21a and is connected to both of them.

[0216] The lead wiring portion 25af is electrically connected to the lead wiring portion 23af and the first coil wiring 21a so as to be parallel to the lead wiring portion 24af.

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

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

[0219] As shown in FIGS. 16, 17, and 18, the number of the first lead wirings 22af increases from the first external electrode 30a side toward the first coil wiring 21a side.

[0220] In the examples shown in FIGS. 16, 17, and 18, the number of the first lead wirings 22af increases from one (lead wiring portion 23af) to two (lead wiring portions 24af and 25af) as going from the first external electrode 30a side toward the first coil wiring 21a side.

[0221] Note that the number of the first lead wirings 22af may increase in a manner other than the above-described as going from the first external electrode 30a side toward the first coil wiring 21a side. For example, the number of the first lead wirings 22af may increase from one to three as going from the first external electrode 30a side toward the first coil wiring 21a side, or may increase from one to two and then increase from two to three. In the above-described example, the number of the first lead wirings 22af is one at the most first external electrode 30a side, but may be plural.

[0222] As described above, in the inductor component in which the number of the first lead wirings increases as going from the first external electrode side toward the first coil wiring side, concentration of current on the first lead wirings is suppressed.

[0223] As shown in FIG. 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 FIG. 16, the number of the second lead wirings 22bf may increase as going from the second external electrode 30b side toward the second coil wiring 21b side.

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

[0225] [Embodiment 5] In the inductor component according to Embodiment 5 of the present invention, when viewed from the length direction orthogonal to the coil axis direction, in the coil axis direction, both end portions of the first lead wiring and both end portions of the first external electrode are displaced from each other. The inductor component according to Embodiment 5 of the present invention is the same as the inductor component according to Embodiment 1 of the present invention except for this point.

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

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

[0228] In the inductor component 1E shown in FIG. 19, as shown in FIG. 20, 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 displaced from each other.

[0229] In the inductor component 1E, 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 displaced from each other, compared with the inductor component 1A, locations where stress is likely to remain near the first lead wiring 22aa during firing in the manufacturing process are away from the side surface 13a of the body 10 and the end E30a on the side surface 13a side of the body 10 in the first external electrode 30a. Therefore, in the inductor component 1E, even when an external load is applied to the side surface 13a of the body 10 and the end E30a on the side surface 13a side of the body 10 in the first external electrode 30a, peeling at the interface between the first lead wiring 22aa triggered by the external load and the body 10 is suppressed, and as a result, the occurrence of cracks is suppressed.

[0230] In FIGS. 19 and 20, an example of an aspect in which the first coil wiring 21a is electrically connected to the first external electrode 30a via one first lead wiring 22aa is shown, but an aspect in which the first coil wiring 21a is electrically connected to the first external electrode 30a via a plurality of first lead wirings may also be used. In this case, when viewed from the length direction L, in the coil axis direction, it is preferable that both ends of each first lead wiring and both ends of the first external electrode 30a are displaced from each other.

[0231] FIG. 21 is a perspective schematic view showing an example of an inductor component according to a modification of Embodiment 5 of the present invention.

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

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

[0234] In the inductor component 1E' shown in FIG. 21, as shown in FIG. 22, when viewed from the length direction L, 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 shifted from each other.

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

[0236] As described above, in the inductor component 1E', the first lead wiring 22aa is located as far as possible from the side surface 13a of the element body 10 and the end portion E30a on the side surface 13a side of the element body 10 in the first external electrode 30a in the coil axis direction. As a result, compared with the inductor component 1E, the locations where stress is likely to remain near the first lead wiring 22aa during firing in the manufacturing process are farther away from the side surface 13a of the element body 10 and the end portion E30a on the side surface 13a side of the element body 10 in the first external electrode 30a. Therefore, in the inductor component 1E', even when an external load is applied to the side surface 13a of the element body 10 and the end portion E30a on the side surface 13a side of the element body 10 in the first external electrode 30a, the interfacial peeling between the first lead wiring 22aa triggered by the external load and the element body 10 is suppressed, and as a result, the generation of cracks is suppressed.

[0237] In FIGS. 21, 22, and 23, an example of the mode in which the first coil wiring 21a is electrically connected to the first external electrode 30a via one first lead wiring 22aa is shown. However, a mode in which the first coil wiring 21a is electrically connected to the first external electrode 30a via a plurality of first lead wirings may also be employed. In this case, when viewed from the length direction L, in the coil axis direction, the both ends of each first lead wiring and the both ends E30a and F30a of the first external electrode 30a are displaced from each other. For at least one first lead wiring, when viewed from the length direction L, in the coil axis direction, one end portion E21a of the first coil wiring 21a and one end portion of the first lead wiring are located at different heights, and when viewed from the length direction L, in the coil axis direction, the other end portion F21a of the first coil wiring 21a and the other end portion of the first lead wiring are preferably located at the same height.

[0238] As shown in FIGS. 19 and 21, when viewed from the length direction L, in the coil axis direction, both ends of the second lead wiring 22ba and both ends of the second external electrode 30b may be offset from each other. In this case, as shown in FIG. 21, when viewed from the length direction L, in the coil axis direction, one end of the second coil wiring 21b (here, the end on the side of the side surface 13b of the element body 10) and one end of the second lead wiring 22ba (here, the end on the side of the side surface 13b of the element body 10) may be located at different heights. Further, when viewed from the length direction L, in the coil axis direction, the other end of the second coil wiring 21b located inside the element body 10 with respect to one end of the second coil wiring 21b (here, the end on the side of the side surface 13b of the element body 10), that is, the other end of the second coil wiring 21b whose distance from the surface of the element body 10 (here, the side surface 13b) is larger than that of one end of the second coil wiring 21b (here, the end on the side of the side surface 13b of the element body 10), and the other end of the second lead wiring 22ba located inside the element body 10 with respect to one end of the second lead wiring 22ba (here, the end on the side of the side surface 13b of the element body 10), that is, the other end of the second lead wiring 22ba whose distance from the surface of the element body 10 (here, the side surface 13b) is larger than that of one end of the second lead wiring 22ba (here, the end on the side of the side surface 13b of the element body 10) may be located at the same height.

[0239] In the above-described Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, and Embodiment 5 (modification of Embodiment 5), examples of the aspect in which the mounting surface of the element body is parallel to the coil axis direction are shown. However, in these embodiments, the mounting surface of the element body may be perpendicular to the coil axis direction.

[0240] [Embodiment 6] In the inductor component according to 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. Further, in the inductor component according to Embodiment 6 of the present invention, 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 wiring is located on the top surface side of the base body with respect to the second lead wiring in the coil axis direction, and the dimension of each first lead wiring in the coil axis direction is smaller than the dimension of each second lead wiring in the coil axis direction. The inductor component according to Embodiment 6 of the present invention is the same as the inductor component according to Embodiment 1 of the present invention except for this point.

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

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

[0243] As shown in FIG. 24, in the inductor component 1F, the surface of the base body 10 includes end faces 11a and 11b opposite to each other in the length direction L, top faces 12a and 12b opposite to each other in the height direction T, and side faces 13a and 13b opposite to each other 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 perpendicular to the coil axis direction and a top surface 12a opposite to the bottom surface 12b in the coil axis direction.

[0244] In the present embodiment, unless otherwise specified, the coil axis direction is a direction 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 object to be mounted (for example, a substrate) 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 FIG. 24, the coil 50 is provided inside the base body 10 and is wound in a spiral shape along the coil axis direction.

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

[0248] As shown in FIG. 24, the coil 50 is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction.

[0249] In the example shown in FIG. 24, the plurality of 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 plurality of 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 plurality of coil wirings.

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

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

[0254] As shown in FIG. 24, the first external electrode 30a extends from a part of the bottom surface 12b of the element body 10 to a part of the end surface 11a. That is, the first external electrode 30a is exposed not only on a part of the bottom surface 12b of the element body 10 but also on a part of the end surface 11a of the element body 10.

[0255] As shown in FIG. 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 one second lead wiring 52ba.

[0256] As shown in FIG. 24, the second external electrode 30b extends from a part of the bottom surface 12b of the element body 10 to a part of the end surface 11b. That is, the second external electrode 30b is exposed not only on a part of the bottom surface 12b of the element body 10 but also on a part of the end surface 11b of the element body 10.

[0257] As shown in FIG. 24, the first lead wiring 52aa is located on the top surface 12a side of the element body 10 closer to the coil axis direction than the second lead wiring 52ba.

[0258] As shown in FIG. 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 the inductor component 1F, since 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, the stress remaining in the vicinity of the first lead wiring 52aa during firing in the manufacturing process is suppressed. Therefore, in the inductor component 1F, even when an external load is applied to the element body 10 and the first external electrode 30a in the vicinity of the first lead wiring 52aa, the interfacial peeling between the first lead wiring 52aa and the element body 10 triggered by the external load is suppressed, and as a result, the generation of cracks is suppressed.

[0260] In FIG. 24, an example of an aspect is shown 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, an aspect in which the first coil wiring 51a is electrically connected to the first external electrode 30a via a plurality of first lead wirings, and the second coil wiring 51b is electrically connected to the second external electrode 30b via a plurality of second lead wirings may also be used. That is, 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, it is sufficient that the dimension in the coil axis direction of each first lead wiring is smaller than the dimension in the coil axis direction of each second lead wiring. In other words, it is sufficient that the maximum value of the dimensions in the coil axis direction of all the first lead wirings is smaller than the minimum value of the dimensions in the coil axis direction of all the second lead wirings.

[0261] In the second aspect of the inductor component of the present invention, a body, a coil provided inside the body and wound in a spiral shape along the coil axis direction, a first external electrode electrically connected to one end of the coil and exposed on the surface of the body, and a second external electrode electrically connected to the other end of the coil and exposed on the surface of the body are provided. The body includes an insulator, the coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction, 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. When viewed from the length direction orthogonal to the coil axis direction, in the coil axis direction, both ends of the first lead wiring and both ends of the first external electrode are displaced from each other.

[0262] [Embodiment 7] An example of the second aspect 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 constituting 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 constituting the inductor component 1A described above, respectively.

[0266] In the present embodiment, unless otherwise specified, the coil axis direction is set to be 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 constituting 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 displaced 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 displaced from each other, compared with the inductor component 1A, in the vicinity of the first lead wiring 22aa' during firing in the manufacturing process, the locations where stress easily remains are 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, the interfacial peeling between the first lead wiring 22aa' and the element body 10 triggered by the external load is suppressed, and as a result, the generation 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 at 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 FIG. 25, when viewed from the length direction L, in the coil axis direction, it is preferable that both ends of the second lead wiring 22ba’ and both ends of the second external electrode 30b are displaced from each other.

[0277] In FIG. 25, an example of an aspect where the mounting surface of the element body is parallel to the coil axis direction is shown, but an aspect where the mounting surface of the element body is perpendicular to the coil axis direction may also be used.

[0278] Other aspects 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 example of Embodiment 5), and Embodiment 6 described above, respectively.

[0279] Regarding the inductor component 2A, when viewed from the length direction L, in the coil axis direction, the configuration in which both ends E22aa’ and F22aa’ of the first lead wiring 22aa’ and both ends E30a and F30a of the first external electrode 30a are displaced from each other is, for example, for an inductor component in which the dimensions of the first coil wiring 21a and the first lead wiring 22aa’ in the coil axis direction are the same as each other, by reducing the dimension of the insulating layer between the first coil wiring 21a and the second coil wiring 21b in the coil axis direction, or increasing the dimension of the first external electrode 30a in the coil axis direction. The configuration in which both ends of the second lead wiring 22ba’ and both ends of the second external electrode 30b are displaced from each other in the coil axis direction when viewed from the length direction L is similarly realized.

[0280] In the third aspect, the inductor component of the present invention includes 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. 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 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 coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction. The plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead-out wiring and a second coil wiring electrically connected to the second external electrode via at least one second lead-out wiring. The first lead-out wiring is located on the top surface side of the base body with respect to the second lead-out wiring in the coil axis direction. When viewed from the length direction orthogonal to the coil axis direction, the minimum distance between the end of the first lead-out wiring and the end of the first external electrode is larger than the minimum distance between the end of the second lead-out wiring and the end of the second external electrode in the width direction orthogonal to the coil axis direction and the length direction.

[0281] [Embodiment 8] An example of the 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] FIG. 27 is a perspective schematic view showing an example of the inductor component of Embodiment 8 of the present invention.

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

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

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

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

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

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

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

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

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

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

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

[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, peeling at the interface between the first lead wiring 52aa' and the element body 10 triggered by the external load is suppressed, and as a result, the occurrence of cracks is suppressed.

[0296] Regarding other aspects of the first lead wiring 52aa' and the second lead wiring 52ba', it is preferable that they are the same as the first lead wiring and the second lead wiring in Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5 (a modified example of Embodiment 5), and Embodiment 6 described above, respectively.

[0297] Regarding the inductor component 3A, when viewed from the length direction L, in the width direction W, a configuration in which 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 is realized, for example, by bending the first lead wiring 52aa' toward the side surface 13b side of the element body 10 more than the second lead wiring 52ba' or spreading the first external electrode 30a toward the side surface 13a side of the element body 10 more than the second external electrode 30b with respect to a configuration in which the dimensions of the first coil wiring 51a and the first lead wiring 52aa of the inductor component 1F in the coil axis direction are the same as each other.

[0298] The following content is disclosed in this specification.

[0299] <1> An element body, A coil provided inside the above element body and wound spirally along the coil axis direction, A first external electrode electrically connected to one end of the above coil and exposed on the surface of the above element body, A second external electrode electrically connected to the other end of the above coil and exposed on the surface of the above element body, and comprising, The above element body includes an insulator, The above coil is formed by electrically connecting a plurality of coil wirings laminated in the above coil axis direction, The plurality of the above coil wirings include a first coil wiring electrically connected to the above first external electrode via at least one first lead wiring, An inductor component, wherein the dimension of each of the above first lead wirings in the above coil axis direction is smaller than the dimension of the above first coil wiring in the above coil axis direction.

[0300] <2> The first coil wiring is electrically connected to the first external electrode via a plurality of the first lead wirings arranged in the coil axis direction, the inductor component according to <1>.

[0301] <3> The dimensions of the plurality of the first lead wirings in the coil axis direction are the same as each other, the inductor component according to <2>.

[0302] <4> The plurality of the first lead wirings include a first outer lead wiring and a first inner lead wiring located inside the element body more than the first outer lead wiring in the coil axis direction. The dimensions of the first outer lead wiring and the first inner lead wiring in the coil axis direction are different from each other, the inductor component according to <2>.

[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, the inductor component according to <4>.

[0304] <6> There are three or more of the plurality of the first lead wirings. The intervals of the plurality of the first lead wirings in the coil axis direction are the same as each other, the inductor component according to any one of <2> to <5>.

[0305] <7> The plurality of the first lead wirings include a first outer lead wiring, a first inner lead wiring located inside the element body more than the first outer lead wiring in the coil axis direction, and a first intermediate lead wiring located between the first outer lead wiring and the first inner lead wiring and adjacent to both in the coil axis direction. The distance in the coil axis direction between the first outer lead wiring and the first intermediate lead wiring, and the distance in the coil axis direction between the first inner lead wiring and the first intermediate lead wiring are different from each other. The inductor component according to any one of <2> to <5>.

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

[0307] <9> The plurality of first lead wirings include a first outer lead wiring and a first inner lead wiring located inside the element body in the coil axis direction and closer to the inside of the element body than the first outer lead wiring in the coil axis direction. When viewed from the length direction orthogonal to the coil axis direction, in the coil axis direction, one end portion of the first coil wiring and the end portion of the first outer lead wiring on the side opposite to the first inner lead wiring are located at the same height. When viewed from the length direction, in the coil axis direction, the other end portion of the first coil wiring located inside the element body relative to the one end portion of the first coil wiring and the end portion of the first inner lead wiring on the side opposite to the first outer lead wiring are located at the same height. The inductor component according to any one of <2> to <8>.

[0308] <10> The dimension of the first lead wiring in the coil axis direction increases as it goes from the first external electrode side toward the first coil wiring side. The inductor component according to any one of <1> to <9>.

[0309] <11> The number of the first lead wirings increases as it goes from the first external electrode side toward the first coil wiring side. The inductor component according to any one of <1> to <9>.

[0310] <12> When viewed from the length direction orthogonal to the coil axis direction, in the coil axis direction, both ends of the first lead wiring and both ends of the first external electrode are displaced from each other, and the inductor component according to any one of <1> to <11>.

[0311] <13> When viewed from the length direction, 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, in the coil axis direction, the other end of the first coil wiring located inside the element body relative to the one end of the first coil wiring and the other end of the first lead wiring located inside the element body relative to the one end of the first lead wiring are located at the same height, and the inductor component according to <12>.

[0312] <14> The first coil wiring and the first lead wiring are connected at a corner portion corresponding to a location where the first lead wiring begins to extend while being inclined from a linear portion of the first coil wiring when viewed from the coil axis direction, and the inductor component according to any one of <1> to <13>.

[0313] <15> The surface of the element body includes a bottom surface parallel to the coil axis direction and a top surface facing the bottom surface in the height direction orthogonal 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 element body, and the inductor component according to any one of <1> to <14>.

[0314] <16> The surface of the element body includes a bottom surface perpendicular to the coil axis direction and a top surface facing 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 element body, and the inductor component according to any one of <1> to <14>.

[0315] <17> The plurality of the coil wirings further includes a second coil wiring electrically connected to the second external electrode via at least one second lead wiring. The first lead wiring is located on the top surface side of the element body above the second lead wiring in the coil axis direction. The inductor component according to <16>, wherein a dimension of each of the first lead wirings in the coil axis direction is smaller than a dimension of each of the second lead wirings in the coil axis direction.

[0316] <18> An element body, A coil provided inside the element 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 element body, A second external electrode electrically connected to the other end of the coil and exposed on the surface of the element body, and comprising: The element body includes an insulator, The coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction, The plurality of the coil wirings includes a first coil wiring electrically connected to the first external electrode via at least one first lead wiring. The inductor component, wherein when viewed from the length direction orthogonal to the coil axis direction, both ends of the first lead wiring and both ends of the first external electrode are displaced from each other in the coil axis direction.

[0317] <19> An element body, A coil provided inside the element 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 element body, A second external electrode electrically connected to the other end of the coil and exposed on the surface of the element body, and comprising: The element body includes an insulator, The surface of the above-mentioned base 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 coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction. The plurality of coil wirings include a first coil wiring electrically connected to the first external electrode via at least one first lead-out wiring and a second coil wiring electrically connected to the second external electrode via at least one second lead-out wiring. The first lead-out wiring is located on the top surface side of the base body with respect to the second lead-out wiring in the coil axis direction. When viewed from the length direction orthogonal to the coil axis direction, in the width direction orthogonal to the coil axis direction and the length direction, the minimum distance between the end of the first lead-out wiring and the end of the first external electrode is larger than the minimum distance between the end of the second lead-out wiring and the end of the second external electrode. The inductor component is characterized by this.

[0318] <20> The first coil wiring is electrically connected to the first external electrode via one of the first lead-out wirings. The inductor component according to <1>.

[0319] <21> The dimension of the first inner lead-out wiring in the coil axis direction is smaller than the dimension of the first outer lead-out wiring in the coil axis direction. The inductor component according to <4>.

[0320] <22> The interval between the first inner lead-out wiring and the first intermediate lead-out wiring in the coil axis direction is larger than the interval between the first outer lead-out wiring and the first intermediate lead-out wiring in the coil axis direction. The inductor component according to <7>.

[0321] <23> The dimension of each of the above-mentioned first lead wirings in the coil axis direction is smaller than the dimension of the above-mentioned first coil wiring in the coil axis direction, the inductor component described in <18>.

[0322] <24> The above-mentioned first coil wiring is electrically connected to the above-mentioned first external electrode via one of the above-mentioned first lead wirings, the inductor component described in <18> or <23>.

[0323] <25> The above-mentioned first coil wiring is electrically connected to the above-mentioned first external electrode via a plurality of the above-mentioned first lead wirings arranged in the coil axis direction, the inductor component described in <18> or <23>.

[0324] <26> The dimensions of the plurality of the above-mentioned first lead wirings in the coil axis direction are the same as each other, the inductor component described in <25>.

[0325] <27> The plurality of the above-mentioned first lead wirings include a first outer lead wiring and a first inner lead wiring located inside the above-mentioned element body in the coil axis direction with respect to the first outer lead wiring. The dimensions of the above-mentioned first outer lead wiring and the above-mentioned first inner lead wiring in the coil axis direction are different from each other, the inductor component described in <25>.

[0326] <28> The dimension of the above-mentioned first outer lead wiring in the coil axis direction is smaller than the dimension of the above-mentioned first inner lead wiring in the coil axis direction, the inductor component described in <27>.

[0327] <29> The dimension of the above-mentioned first inner lead wiring in the coil axis direction is smaller than the dimension of the above-mentioned first outer lead wiring in the coil axis direction, the inductor component described in <27>.

[0328] <30> There are three or more of the plurality of the above-mentioned first lead wirings. The intervals in the coil axis direction of the plurality of the first lead wirings are the same as each other, and the inductor component described in any one of <25> to <29>.

[0329] <31> The plurality of the first lead wirings include a first outer lead wiring, a first inner lead wiring located inside the element body in the coil axis direction with respect to the first outer lead wiring, and a first intermediate lead wiring located between the first outer lead wiring and the first inner lead wiring and adjacent to both of them in the coil axis direction. The interval in the coil axis direction between the first outer lead wiring and the first intermediate lead wiring, and the interval in the coil axis direction between the first inner lead wiring and the first intermediate lead wiring are different from each other, and the inductor component described in any one of <25> to <29>.

[0330] <32> The interval in the coil axis direction between the first outer lead wiring and the first intermediate lead wiring is larger than the interval in the coil axis direction between the first inner lead wiring and the first intermediate lead wiring, and the inductor component described in <31>.

[0331] <33> The interval in the coil axis direction between the first inner lead wiring and the first intermediate lead wiring is larger than the interval in the coil axis direction between the first outer lead wiring and the first intermediate lead wiring, and the inductor component described in <31>.

[0332] <34> The plurality of the first lead wirings include a first outer lead wiring and a first inner lead wiring located inside the element body in the coil axis direction with respect to the first outer lead wiring. When viewed from the length direction orthogonal to the coil axis direction, in the coil axis direction, one end portion of the first coil wiring and the end portion of the first outer lead wiring on the side opposite to the first inner lead wiring are located at the same height. When viewed from the above length direction, in the coil axis direction, the other end of the first coil wiring located inside the element body rather than the one end of the first coil wiring, and the end of the first inner lead wiring on the side opposite to the first outer lead wiring are located at the same height, the inductor component according to any one of <25> to <33>.

[0333] <35> 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, the inductor component according to any one of <18>, <23> to <34>.

[0334] <36> The number of the first lead wirings increases from the first external electrode side toward the first coil wiring side, the inductor component according to any one of <18>, <23>, <25> to <34>.

[0335] <37> When viewed from the above length direction, 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 above length direction, in the coil axis direction, the other end of the first coil wiring located inside the element body rather than the one end of the first coil wiring, and the other end of the first lead wiring located inside the element body rather than the one end of the first lead wiring are located at the same height, the inductor component according to any one of <18>, <23> to <36>.

[0336] <38> The first coil wiring and the first lead wiring are connected at a corner portion corresponding to a location where the first lead wiring starts to extend while tilting from a linear portion of the first coil wiring when viewed from the coil axis direction, the inductor component according to any one of <18>, <23> to <37>.

[0337] <39> The surface of the base body includes a bottom surface parallel to the coil axis direction and a top surface facing 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, and are the inductor component according to any one of <18>, <23> to <38>.

[0338] <40> The surface of the base body includes a bottom surface perpendicular to the coil axis direction and a top surface facing 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, and are the inductor component according to any one of <18>, <23> to <38>.

[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 wiring is located on the top surface side of the base body with respect to the second lead wiring in the coil axis direction. The dimension of each first lead wiring in the coil axis direction is smaller than the dimension of each second lead wiring in the coil axis direction, and is the inductor component according to <40>.

[0340] <42> The dimension of each first lead wiring in the coil axis direction is smaller than the dimension of the first coil wiring in the coil axis direction, and is the inductor component according to <19>.

[0341] <43> The first coil wiring is electrically connected to the first external electrode via one of the first lead wirings, and is the inductor component according to <19> or <42>.

[0342] <44> The first coil wiring is electrically connected to the first external electrode via a plurality of the first lead wirings arranged in the coil axis direction, the inductor component according to <19> or <42>.

[0343] <45> The dimensions of the plurality of the first lead wirings in the coil axis direction are the same as each other, the inductor component according to <44>.

[0344] <46> The plurality of the first lead wirings include a first outer lead wiring and a first inner lead wiring located inside the element body than the first outer lead wiring in the coil axis direction. The dimensions of the first outer lead wiring and the first inner lead wiring in the coil axis direction are different from each other, the inductor component according to <44>.

[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, the inductor component according to <46>.

[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, the inductor component according to <46>.

[0347] <49> There are three or more of the plurality of the first lead wirings. The intervals of the plurality of the first lead wirings in the coil axis direction are the same as each other, the inductor component according to any one of <44> to <48>.

[0348] <50> The plurality of the first lead wirings include a first outer lead wiring, a first inner lead wiring located inside the element body than the first outer lead wiring in the coil axis direction, and a first intermediate lead wiring located between the first outer lead wiring and the first inner lead wiring and adjacent to both in the coil axis direction. The interval in the coil axis direction between the first outer lead wiring and the first intermediate lead wiring, and the interval in the coil axis direction between the first inner lead wiring and the first intermediate lead wiring are different from each other, and the inductor component described in any one of <44> to <48>.

[0349] <51> The interval in the coil axis direction between the first outer lead wiring and the first intermediate lead wiring is larger than the interval in the coil axis direction between the first inner lead wiring and the first intermediate lead wiring, and the inductor component described in <50>.

[0350] <52> The interval in the coil axis direction between the first inner lead wiring and the first intermediate lead wiring is larger than the interval in the coil axis direction between the first outer lead wiring and the first intermediate lead wiring, and the inductor component described in <50>.

[0351] <53> The plurality of the first lead wirings include a first outer lead wiring and a first inner lead wiring located inside the element body than the first outer lead wiring in the coil axis direction. When viewed from the length direction orthogonal to the coil axis direction, in the coil axis direction, one end portion of the first coil wiring and the end portion of the first outer lead wiring on the side opposite to the first inner lead wiring are located at the same height. When viewed from the length direction, in the coil axis direction, the other end portion of the first coil wiring located inside the element body than the one end portion of the first coil wiring and the end portion of the first inner lead wiring on the side opposite to the first outer lead wiring are located at the same height, and the inductor component described in any one of <44> to <52>.

[0352] <54> 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, and is the inductor component described in any one of <19>, <42> to <53>.

[0353] <55> The number of the first lead wirings increases from the first external electrode side toward the first coil wiring side, and is the inductor component described in any one of <19>, <42>, <44> to <53>.

[0354] <56> When viewed from the length direction orthogonal to the coil axis direction, in the coil axis direction, both ends of the first lead wiring and both ends of the first external electrode are displaced from each other, and are the inductor component described in any one of <19>, <42> to <55>.

[0355] <57> When viewed from the length direction, 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, in the coil axis direction, the other end of the first coil wiring located inside the element body with respect to the one end of the first coil wiring and the other end of the first lead wiring located inside the element body with respect to the one end of the first lead wiring are located at the same height, and are the inductor component described in <56>.

[0356] <58> The first coil wiring and the first lead wiring are connected at a corner portion corresponding to a location where the first lead wiring starts to extend while inclining from a linear portion of the first coil wiring when viewed from the coil axis direction, and are the inductor component described in any one of <19>, <42> to <57>.

[0357] <59> The dimension of each of the above-described first lead wirings in the coil axis direction is smaller than the dimension of each of the above-described second lead wirings in the coil axis direction, and the inductor component described in any one of <19>, <42> to <58>.

Explanation of Signs

[0358] 1A, 1B, 1C, 1D, 1E, 1E’, 1F, 2A, 3A Inductor Component 10 Body 11a, 11b End Faces of the Body 12a Top Face of the Body 12b Bottom Face of the Body 13a, 13b Side Faces of the Body 15a, 15b, 15c, 15d, 15e, 15f, 15g Insulation Layers 20, 50 Coils 21a, 51a First Coil Wiring 21b, 51b Second Coil Wiring 22aa, 22aa’, 22ab, 22ac, 22ad, 22ae, 22af, 52aa, 52aa’ First Lead Wires 22ba, 22ba’, 22bb, 22be, 22bf, 52ba, 52ba’ Second Lead Wires 23ae, 24ae, 23af, 24af, 25af Lead Wire Portions 29a, 59a Connection Conductors 30a First External Electrode 30b Second External Electrode 121aa, 121ab First Coil Conductor Layers 121ba, 121bb Second Coil Conductor Layers 122aa First Lead Conductor Layer 122ba Second Lead Conductor Layer 129aa Connection Conductor Layer 130aa, 130ab, 130ac, 130ad, 130ae First External Conductor Layers 130ba, 130bb, 130bc, 130bd, 130be Second External Conductor Layers CA, CB Coil Axes D Corner Portion E21a One End Portion of the First Coil Wiring Ends of the first lead wiring of E22aa, E22aa’, F22aa, F22aa’, F22ab, G22aa’ Ends of the first external electrode of E30a, F30a, G30a The other end of the first coil wiring of F21a Length direction of L Height direction of T Width direction of W Dimension of the first coil wiring in the coil axis direction of W21a Dimensions of the first lead wiring in the coil axis direction of W22aa, W22ab, W22ac, W22ad Dimensions of the lead wiring portion in the coil axis direction of W23ae, W24ae Spacings in the coil axis direction between the first lead wirings of Xa, Xb, Xc, Xd Minimum distance between the end of the first lead wiring and the end of the first external electrode of Ya Minimum distance between the end of the second lead wiring and the end of the second external electrode of Yb

Claims

【Claim 1】 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 portion of the coil and exposed on the surface of the base body, a second external electrode electrically connected to the other end portion of the coil and exposed on the surface of the base body, and comprising: 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 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 coil is formed by electrically connecting a plurality of coil wirings laminated in the coil axis direction, 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 wiring is located on the top surface side of the base body with respect to the second lead wiring in the coil axis direction, when viewed from the length direction orthogonal to the coil axis direction, in the width direction orthogonal to the coil axis direction and the length direction, a minimum distance between an end portion of the first lead wiring and an end portion of the first external electrode is larger than a minimum distance between an end portion of the second lead wiring and an end portion of the second external electrode. An inductor component characterized by this.

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