Inductor component

Abstract

To provide an inductor component that improves the Q value while minimizing exposure of internal wiring at the ridges of an element body.SOLUTION: An inductor component 1A includes a rectangular parallelepiped body 10 including end faces 11a, 11b, a top face 12a, a bottom face 12b, and side faces 13a, 13b, an internal wiring 25 including a coil 20 provided inside the body 10, a first external electrode 30a electrically connected to one end of the internal wiring 25 and provided on the end face 11a, and a second external electrode 30b electrically connected to the other end of the internal wiring 25 and provided on the end face 11b, and in a cross section parallel to a coil axis C direction and perpendicular to an extension direction of the internal wiring 25, the internal wiring 25 has four corners, and among the internal wirings 25, the internal wire 25 located at either end in a direction parallel to the coil axis direction includes one in which the shape of the corner adjacent to an angular part of the element body 10 is different from the shapes of the remaining three corners.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 describes a coil winding circuit comprising an element body, a coil provided within the element body and wound in a spiral shape along an axis, and a first external electrode and a second external electrode provided on the element body and electrically connected to the coil, the element body having a plurality of insulating layers stacked along the axis, the coil having a plurality of coil wirings stacked along the axis and via wiring extending along the axis and connecting the coil wirings adjacent to each other in the axial direction, the plurality of coil wirings being wound along a plane and electrically connected in series to form a spiral, and the plurality of coil wirings being wound along a plane and electrically connected in series to form a spiral the coil wiring has a first coil wiring located at the furthest side in a direction parallel to the axis and connected to the first external electrode, and a second coil wiring located at the furthest side in a direction parallel to the axis and connected to the second external electrode, wherein the area of ​​the end face of the via wiring on the one side in a direction parallel to the axis is smaller than the area of ​​the end face of the via wiring on the other side in a direction parallel to the axis, and the thickness of the second coil wiring in a direction parallel to the axis is thicker than the thickness of the first coil wiring in a direction parallel to the axis.

[0003] Patent document 2 discloses a laminated chip component including multiple stacked layers, having a conductor path formed by stacking three or more conductor layers, and in at least a part of the conductor path, outer conductor layers narrower than an intermediate conductor layer are formed above and below the intermediate conductor layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-128975 [Patent Document 2] JP 2003-257740 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the inductor component described in Patent Document 1, if the inner diameter of the coil is increased to improve the Q value, there is a possibility that the coil wiring inside the element body will be exposed at the ridges of the element body. Note that while Figure 1 of Patent Document 1 shows the ridges of the element body as right angles, in an actual inductor component the ridges of the element body are curved (marked with an R).

[0006] In the inductor component described in Patent Document 2, as shown in FIG. 3 of Patent Document 2, all four corners of the cross section of the conductor path are stepped, which reduces the cross-sectional area of ​​the conductor path. This increases Rdc (direct current resistance). Here, because Q=X / R=X / (Rdc+Rac) (where Rac is alternating current resistance), Rdc becomes the main cause of loss at low frequencies, and the Q value at low frequencies decreases.

[0007] The present invention has been made to solve the above problems, and aims to provide an inductor component that can improve the Q value while suppressing exposure of internal wiring at the ridge portion of the element body. [Means for solving the problem]

[0008] The inductor component of the present invention comprises a rectangular parallelepiped body including a pair of end faces facing each other in the length direction, a top surface and a bottom surface facing each other in the height direction, and a pair of side surfaces facing each other in the width direction; an internal wiring provided inside the body and including a coil wound spirally along a coil axis direction; a first external electrode electrically connected to one end of the internal wiring and provided on one of the pair of end faces; and a second external electrode electrically connected to the other end of the internal wiring and provided on the other of the pair of end faces, wherein in a cross section parallel to the coil axis direction and perpendicular to the direction in which the internal wiring extends, the internal wiring has four corners, and the internal wiring located at the end-most position at one of the ends in a direction parallel to the coil axis direction includes a corner having a shape adjacent to a corner of the body that is different from the shapes of the remaining three corners. Effect of the Invention

[0009] According to the present invention, it is possible to provide an inductor component that can improve the Q value while suppressing exposure of the internal wiring at the edge portions of the element body. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic perspective view showing an example of an inductor component according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing an example of a cross section of the inductor component shown in FIG. 1 taken along line segment a1-a2. [Diagram 3] FIG. 3 is a schematic cross-sectional view showing an example of a cross section of the inductor component shown in FIG. 1 taken along line segment b1-b2. [Figure 4] FIG. 4 is a schematic cross-sectional view showing an example of a corner of the element body and its vicinity in the inductor component shown in FIG. 2 or FIG. [Diagram 5] FIG. 5 is a schematic perspective view showing an example of an inductor component according to the second embodiment of the present invention. [Figure 6] FIG. 6 is a schematic cross-sectional view showing an example of a cross section of the inductor component shown in FIG. 5 taken along line segment a1-a2. [Figure 7] FIG. 7 is a schematic cross-sectional view showing an example of a cross section of the inductor component shown in FIG. 5 taken along line segment b1-b2. [Figure 8] FIG. 8 is a schematic perspective view showing an example of an inductor component according to the third embodiment of the present invention. [Figure 9] FIG. 9 is a schematic cross-sectional view showing an example of a cross section of the inductor component shown in FIG. 8 taken along line segment a1-a2. [Figure 10] FIG. 10 is a schematic cross-sectional view showing an example of a cross section of the inductor component shown in FIG. 9 taken along line segment b1-b2. [Figure 11] FIG. 11 is a schematic cross-sectional view showing an example of an inductor component according to a fourth embodiment of the present invention. [Figure 12] FIG. 12 is a schematic cross-sectional view showing an example of a corner of the element body and its vicinity in the inductor component shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The inductor component of the present invention will be described below. Note that the present invention is not limited to the following configurations, and may be modified as appropriate without departing from the gist of the present invention. In addition, a combination of multiple individual preferred configurations described below also constitutes the present invention.

[0012] The following embodiments are merely examples, and it goes without saying that partial replacement or combination of the configurations shown in different embodiments is possible. In the second and subsequent embodiments, the description of the matters common to the first embodiment will be omitted, and the differences will be mainly described. In particular, the same effects and advantages due to the same configuration will not be mentioned one by one for each embodiment.

[0013] In the following description, unless there is a need to distinguish between the various embodiments, they will simply be referred to as "the inductor component of the present invention."

[0014] The drawings shown below are schematic diagrams, and the dimensions, aspect ratio, and scale may differ from those of the actual product.

[0015] In this specification, terms indicating the relationship between elements (e.g., "parallel," "perpendicular," "orthogonal," etc.) and terms indicating the shapes of elements not only mean the literal strict form, but also mean a range that is substantially equivalent, for example, a range that includes a difference of about a few percent.

[0016] The inductor component of the present invention comprises a rectangular parallelepiped body including a pair of end faces facing each other in the length direction, a top surface and a bottom surface facing each other in the height direction, and a pair of side surfaces facing each other in the width direction; an internal wiring provided inside the body and including a coil wound spirally along a coil axis direction; a first external electrode electrically connected to one end of the internal wiring and provided on one of the pair of end faces; and a second external electrode electrically connected to the other end of the internal wiring and provided on the other of the pair of end faces, wherein in a cross section parallel to the coil axis direction and perpendicular to the direction in which the internal wiring extends, the internal wiring has four corners, and the internal wiring located at the end-most position at one of the ends in a direction parallel to the coil axis direction includes a corner having a shape adjacent to a corner of the body that is different from the shapes of the remaining three corners.

[0017] [Embodiment 1] An example of the inductor component of the present invention will be described below as the inductor component of embodiment 1 of the present invention.

[0018] FIG. 1 is a schematic perspective view showing an example of an inductor component according to a first embodiment of the present invention.

[0019] An inductor component 1A shown in FIG. 1 includes an element body 10, internal wiring 25 including a coil 20, a first external electrode 30a, and a second external electrode 30b.

[0020] In this specification, the length direction, height direction, and width direction are defined as directions L, T, and W, respectively, as shown in Fig. 1 etc. Here, the length direction L, height direction T, and width direction W are perpendicular to each other.

[0021] 1, in inductor component 1A, the surface of element body 10 includes a pair of end faces 11a and 11b facing each other in length direction L, a top face 12a and a bottom face 12b facing each other in height direction T, and a pair of side faces 13a and 13b facing each other in width direction W. In inductor component 1A, width direction W is parallel to the coil axis direction of coil 20. That is, in inductor component 1A, the surface of element body 10 includes bottom face 12b parallel to the coil axis direction, and top face 12a facing bottom face 12b in height direction T perpendicular to the coil axis direction.

[0022] In inductor component 1A, bottom surface 12b of element body 10 is a mounting surface. More specifically, bottom surface 12b of element body 10 is a mounting surface that faces an object to be mounted (e.g., a substrate) when inductor component 1A is mounted. Therefore, in inductor component 1A, the mounting surface of element body 10, i.e., bottom surface 12b of element body 10, is parallel to the coil axis direction.

[0023] At least one of the surfaces of the element body 10, i.e., end surface 11a, end surface 11b, top surface 12a, bottom surface 12b, side surface 13a, and side surface 13b, may be provided with markings to make each surface easier to identify.

[0024] End faces 11a and 11b of element body 10 do not need to be strictly perpendicular to the length direction L. In addition, top face 12a and bottom face 12b of element body 10 do not need to be strictly perpendicular to the height direction T. Furthermore, side faces 13a and 13b of element body 10 do not need to be strictly perpendicular to the width direction W.

[0025] As shown in FIG. 1, the element body 10 has a rectangular parallelepiped shape.

[0026] In this specification, the rectangular parallelepiped shape may refer to any shape that can be said to be substantially rectangular parallelepiped, and includes, for example, a roughly rectangular parallelepiped shape with rounded corners and edges as described below.

[0027] It is preferable that the corners and ridges of element body 10 are rounded. A corner of element body 10 is a portion where three faces of element body 10 intersect when element body 10 is viewed three-dimensionally, and is a portion where two sides of element body 10 intersect when element body 10 is viewed in cross section as described below. A ridge of element body 10 is a portion where two faces of element body 10 intersect.

[0028] The element body 10 includes an insulating layer, and is formed by stacking multiple insulating layers in the coil axis direction. However, since the boundaries between these layers are not clearly visible in reality, the insulating layers are not shown in FIG. 1.

[0029] Examples of insulating materials constituting the insulating layer include glass materials mainly composed of borosilicate glass, ceramic materials, organic materials such as epoxy resins, fluororesins, and polymer resins, composite materials such as glass epoxy resins, etc. As the insulating material, materials with small dielectric constants and dielectric losses are particularly preferable.

[0030] The insulating materials constituting the multiple insulating layers may be the same as each other, may be different from each other, or may be partially different from each other.

[0031] The dimensions of the multiple 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.

[0032] As shown in FIG. 1, the coil 20 is provided inside the element body 10 and is wound spirally along the coil axial direction.

[0033] The coil axis direction of the coil 20 is the direction in which the coil axis C 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.

[0034] Coil 20 is configured in a spirally wound state by electrically connecting at least a portion of internal wiring 25 provided inside element body 10 while stacking it in the coil axial direction.

[0035] The internal wiring 25 includes a plurality of internal wirings, specifically, a first internal wiring 25a and a second internal wiring 25b. That is, in this embodiment, the number of layers of the internal wiring 25 is two.

[0036] The first internal wiring 25a is the internal wiring located at one end of the multiple internal wirings 25 in a direction parallel to the coil axis direction, and is located at the outermost position of the internal wiring 25 on the side 13a side of the base body 10 in the coil axis direction.

[0037] The first internal wiring 25a is connected to the first external electrode 30a.

[0038] The second internal wiring 25b is the internal wiring located at the other end of the multiple internal wirings 25 in a direction parallel to the coil axis direction, and is located at the outermost position of the internal wiring 25 on the side 13b side of the base body 10 in the coil axis direction.

[0039] The second internal wiring 25b is connected to the second external electrode 30b.

[0040] As in a second embodiment described later, at least one internal wire may be present between the first internal wire 25a and the second internal wire 25b in the coil axial direction.

[0041] The first internal wiring 25a includes a first coil wiring 21a and a first escape wiring 22a.

[0042] The second internal wiring 25b includes a second coil wiring 21b and a second escape wiring 22b.

[0043] The coil 20 is formed by stacking and electrically connecting a plurality of coil wirings including at least a part of the internal wiring 25, more specifically, the first coil wiring 21a and the second coil wiring 21b, in the coil axial direction. That is, the first coil wiring 21a and the second coil wiring 21b each constitute the coil 20.

[0044] The first coil wiring 21a may have a single-layer structure, but from the viewpoint of ease of manufacture, it is preferable that the first coil wiring 21a has a multi-layer structure.

[0045] The second coil wiring 21b may have a single-layer structure, but from the standpoint of ease of manufacture, it is preferable that it has a multi-layer structure.

[0046] At least one coil wiring may be present between the first coil wiring 21a and the second coil wiring 21b in the coil axial direction.

[0047] Examples of conductive materials constituting the coil wiring include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0048] The conductive materials constituting the multiple coil wirings may be the same as each other, may be different from each other, or may be partially different from each other.

[0049] The dimensions of the multiple coil wirings in the coil axis direction may be the same as each other, may be different from each other, or may be partially different.

[0050] For multiple coil wirings, the dimensions in a direction perpendicular to the direction in which the coil wiring extends when viewed from the coil axis direction, i.e., 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 different in some areas.

[0051] Among the multiple coil wirings, adjacent coil wirings in the coil axis direction may be electrically connected through a connection conductor (via) that penetrates an insulating layer between the adjacent coil wirings in the coil axis direction. In the example shown in Fig. 1, the coil 20 is configured such that a first coil wiring 21a and a second coil wiring 21b that are stacked in the coil axis direction are electrically connected through a connection conductor 60.

[0052] The connecting conductor may have a single-layer structure or a multi-layer structure.

[0053] Examples of conductive materials constituting the connecting conductor include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0054] When viewed from the coil axial direction, the coil 20 may have a shape consisting of only straight portions, a shape consisting of only curved portions, or a shape consisting of straight portions and curved portions. For example, when viewed from the coil axial direction, the coil 20 may have a circular shape, an elliptical shape, or a polygonal shape.

[0055] As shown in Fig. 1, the first external electrode 30a is electrically connected to one end of the internal wiring 25 (here, first internal wiring 25a). 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 the first extension wiring 22a. In other words, the first extension wiring 22a connects the first coil wiring 21a and the first external electrode 30a.

[0056] The first escape routing 22a may have a single-layer structure or a multi-layer structure.

[0057] As shown in Fig. 1, the second external electrode 30b is electrically connected to the other end of the internal wiring 25 (here, the second internal wiring 25b). More specifically, as shown in Fig. 1, the second coil wiring 21b constituting the coil 20 is electrically connected to the second external electrode 30b via the second lead-out wiring 22b. In other words, the second lead-out wiring 22b connects the second coil wiring 21b and the second external electrode 30b.

[0058] The second escape wiring 22b may have a single-layer structure or a multi-layer structure.

[0059] Examples of conductive materials constituting the lead-out wiring include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0060] The conductive materials constituting the first escape routing 22a and the second escape routing 22b may be the same as or different from each other.

[0061] In this specification, wiring that does not overlap the winding portion of the coil (protruding from the winding portion of the coil) when viewed from the coil axial direction is referred to as an extraction wiring (for example, the example shown in FIG. 1).

[0062] 1, the first external electrode 30a is provided on an end surface 11a of the element body 10. That is, in the example shown in FIG 1, the first external electrode 30a is exposed at least on the end surface 11a of the element body 10.

[0063] As shown in FIG. 1, the first external electrode 30a is preferably exposed at the bottom surface 12b of the element body .

[0064] 1, the first external electrode 30a extends from part of the end face 11a to part of the bottom face 12b of the element body 10. That is, in the example shown in Fig. 1, the first external electrode 30a is exposed not only to part of the end face 11a of the element body 10, but also to part of the bottom face 12b of the element body 10.

[0065] The first external electrode 30a may be exposed only at the end surface 11a of the element body .

[0066] 1, the second external electrode 30b is provided on an end surface 11b of the element body 10. That is, in the example shown in FIG 1, the second external electrode 30b is exposed at least on the end surface 11b of the element body 10.

[0067] As shown in FIG. 1, the second external electrode 30b is preferably exposed at the bottom surface 12b of the element body .

[0068] 1, the second external electrode 30b extends from a part of the end face 11b to a part of the bottom face 12b of the element body 10. That is, in the example shown in Fig. 1, the second external electrode 30b is exposed not only to a part of the end face 11b of the element body 10, but also to a part of the bottom face 12b of the element body 10.

[0069] The second external electrode 30b may be exposed only at the end face 11b of the element body .

[0070] As described above, the first external electrode 30a and the second external electrode 30b are provided so as to be spaced apart from each other in the direction (here, the length direction L) perpendicular to the coil axis direction.

[0071] Furthermore, if 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 tends to improve.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Examples of conductive materials constituting the external electrodes include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0077] The conductive materials constituting the first external electrode 30a and the second external electrode 30b may be the same as or different from each other.

[0078] The first external electrode 30a may have a single-layer structure or a multi-layer structure.

[0079] The first external electrode 30a may have, in this order from the coil 20 side, a base electrode containing the above-mentioned 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 may form an integral surface with the surface of the element body 10 (in FIG. 1, the end face 11a and bottom face 12b of the element body 10), and the Ni-plated electrode and the Sn-plated electrode may protrude from the surface of the element body 10 (in FIG. 1, the end face 11a and bottom face 12b of the element body 10) so as to cover the base electrode.

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

[0081] The second external electrode 30b may have, in this order from the coil 20 side, a base electrode containing the above-mentioned 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 may form an integral surface with the surface of the element body 10 (in FIG. 1, the end face 11b and bottom face 12b of the element body 10), and the Ni-plated electrode and the Sn-plated electrode may protrude from the surface of the element body 10 (in FIG. 1, the end face 11b and bottom face 12b of the element body 10) so as to cover the base electrode.

[0082] FIG. 2 is a schematic cross-sectional view showing an example of a cross section along a line segment a1-a2 of the inductor component shown in FIG. 1. FIG. 3 is a schematic cross-sectional view showing an example of a cross section along a line segment b1-b2 of the inductor component shown in FIG. 1. Both FIG. 2 and FIG. 3 show a cross section parallel to the coil axis direction and perpendicular to the extending direction of the internal wiring 25. Such a cross section will be simply referred to as a "vertical cross section" hereinafter. More specifically, FIG. 2 shows a vertical cross section along the length direction L and width direction W of the inductor component 1A shown in FIG. 1, i.e., a vertical cross section including the first coil wiring 21a and the second coil wiring 21b in the LW plane. FIG. 3 shows a vertical cross section along the width direction W and height direction T of the inductor component 1A shown in FIG. 1, i.e., a vertical cross section including the first coil wiring 21a and the second coil wiring 21b in the WT plane.

[0083] As shown in Figure 2, in a vertical cross section (LW plane), each internal wiring 25 has four corners 40a to 40d, and the internal wiring 25 located at either end in a direction parallel to the coil axis direction has a corner 40a adjacent to the corner 14 of the base body 10 in a shape different from the remaining three corners 40b to 40d.

[0084] This allows corner 40a to be shaped so as to be less likely to be exposed from corners 14 of element body 10 (for example, a notched shape as shown in FIG. 2), while the remaining three corners 40b to 40d can be shaped so as to increase the cross-sectional area of ​​internal wiring 25 (for example, a right-angled shape as shown in FIG. 2). In other words, Rdc can be reduced. This makes it possible to improve the Q value of inductor component 1A, particularly the Q value at low frequencies, while preventing the endmost internal wiring 25 from being exposed to the ridges of element body 10, specifically ridges including corners 14.

[0085] In the example shown in Figure 2, in a vertical cross section (LW plane), the first coil wiring 21a of the first internal wiring 25a located at one end in a direction parallel to the coil axis direction has two wiring portions 23a adjacent to two corners 14 of the element body 10, and in each wiring portion 23a, of the four corners 41a to 41d, the shape of the corner 41a adjacent to the corner 14 of the element body 10 is different from the shapes of the remaining three corners 41b to 41d.

[0086] In the example shown in Figure 2, in a vertical cross section (LW plane), the second coil wiring 21b of the second internal wiring 25b located at the other end in a direction parallel to the coil axis direction has two wiring portions 23b adjacent to two corners 14 of the element body 10, and in each wiring portion 23b, of the four corners 42a to 42d, the shape of the corner 42a adjacent to the corner 14 of the element body 10 is different from the shapes of the remaining three corners 42b to 42d.

[0087] Also, as shown in FIG. 3, in a vertical cross section (WT surface), each internal wiring 25 has corners 40a to 40d, and the internal wiring 25 located at either end in a direction parallel to the coil axis direction has a corner 40a adjacent to corner 14 of the base body 10 with a different shape from the remaining three corners 40b to 40d.

[0088] 2, corner 40a can be shaped to be less likely to be exposed from corner 14 of element body 10 (for example, a notched shape as shown in FIG. 3), while the remaining three corners 40b to 40d can be shaped to increase the cross-sectional area of ​​internal wiring 25 (for example, a right-angled shape as shown in FIG. 3). That is, Rdc can be reduced. Therefore, it is possible to improve the Q value of inductor component 1A, particularly the Q value at low frequencies, while preventing internal wiring 25 located at the extreme end from being exposed to ridges of element body 10, specifically ridges including corner 14.

[0089] In the example shown in Figure 3, in a vertical cross section (WT surface), the first coil wiring 21a of the first internal wiring 25a located at one end in a direction parallel to the coil axis direction has one wiring portion 23a adjacent to one corner 14 of the element body 10, and in the wiring portion 23a, of the four corners 41a to 41d, the shape of the corner 41a adjacent to the corner 14 of the element body 10 is different from the shapes of the remaining three corners 41b to 41d.

[0090] In the example shown in Figure 3, in a vertical cross section (WT plane), the second coil wiring 21b of the second internal wiring 25b located at the other end in a direction parallel to the coil axis direction has two wiring portions 23b adjacent to two corners 14 of the element body 10, and in each wiring portion 23b, of the four corners 42a to 42d, the shape of the corner 42a adjacent to the corner 14 of the element body 10 is different from the shapes of the remaining three corners 42b to 42d.

[0091] As shown in Figures 2 and 3, it is preferable that the shape of corner 40a adjacent to corner 14 of element 10 differs from the shapes of the remaining three corners 40b to 40d in both vertical cross sections of the LW and WT planes, but this relationship may be satisfied in only one of the vertical cross sections of the LW and WT planes.

[0092] In this embodiment, it is preferable that this relationship is satisfied at least on the WT surface.

[0093] However, in the inductor component of the present invention, it is sufficient that this relationship is satisfied in at least one vertical cross section.

[0094] In a vertical cross section, each internal wiring 25 has four corners 40a to 40d, and corner 40a adjacent to corner 14 is located opposite corner 40c, and corner 40b is located opposite corner 40d. Corner 40a is located near corner 14 of element body 10. Corners 40b and 40d are located near the flat portion of element body 10. Of the four corners 40a to 40d, corner 40c is located closest to the center of element body 10.

[0095] As shown in Figs. 2 and 3, in a vertical cross section, a corner 40a adjacent to the corner 14 of the element body 10 may have a notched shape.

[0096] In this specification, a "notch shape" refers to a shape in which a single recess is provided toward the center of the internal wiring in a vertical cross section, and may be a staircase shape with one step, as shown in Figures 2 and 3.

[0097] In the vertical cross section, the shapes of the remaining three corners 40b to 40d are not particularly limited, but may be right-angled as shown in FIGS.

[0098] Here, the "right-angled shape" may have a rounded apex (R).

[0099] Fig. 4 is a schematic cross-sectional view showing an example of a corner of an element body and its vicinity in the inductor component shown in Fig. 2 or 3. Note that in Fig. 4, the dashed lines indicate the positions of the side gaps of the product. In other words, they indicate positions offset from the outline of element body 10 by the amount of the side gap. On the other hand, the dashed lines in Figs. 2 and 3 indicate positions offset from the outline of element body 10 by 20 μm.

[0100] In a vertical cross section, it is preferable that a corner 40a of the internal wiring 25 adjacent to a corner 14 of the element body 10 has at least one corner 50, and more preferably at least two corners, such that the distance d (see FIG. 4) between the corner 14 of the element body 10 is equal to or smaller than the side gap of the product (see FIG. 4) or equal to or smaller than 20 μm (see FIGS. 2 and 3). This allows the cross-sectional area of ​​the internal wiring 25 to be increased, thereby enabling the Q value of the inductor component 1A to be further improved.

[0101] In the example shown in FIG. 2, there are 2×4 corners (total of 8 corners) of the internal wiring 25 where the distance from the corner 14 of the element body 10 is 20 μm or less in the vertical cross section (LW plane).

[0102] In the example shown in FIG. 3, there are 2×3 corners (total of 6) of corners 50 of internal wiring 25 where the distance from corner 14 of element body 10 is 20 μm or less in the vertical cross section (WT surface).

[0103] In the example shown in FIG. 4, in the vertical cross section, there are two corners 50 of the internal wiring 25 protruding from the side gap per corner 14.

[0104] In this specification, the side gap of a product refers to the distance from the internal wiring to the surface (flat surface only) of the element body, regardless of the length direction L, width direction W, or height direction T. More specifically, as shown in Fig. 4, in an image of a vertical cross section taken with a scanning electron microscope or the like, a straight line passing through the average position of flat surface portion 15 of element body 10 connected to the curvature of corner portion 14 via connecting portion 16 is calculated, and a straight line parallel to this straight line and passing through the average position of internal wiring 25 facing flat surface portion 15 is calculated, and the distance between these two straight lines is measured to determine the side gap of the product.

[0105] From the viewpoints of impact resistance, plating resistance, and pressure resistance, the lower limit of the side gap is considered to be at least about 2 to 3 μm, and preferably about 5 μm. Even if the side gap is designed to be about 20 μm, if the processing variation is about 3 μm, the minimum side gap at which Cpk = 1.67 is achieved is 5 μm.

[0106] From this viewpoint, the distance d between corner 14 of element 10 and corner 50 of corner portion 40a adjacent to corner 14 is preferably 2 μm or more, more preferably 3 μm or more, and even more preferably 5 μm or more.

[0107] The inductor component 1A is manufactured, for example, by a photolithography method. That is, first, a mother laminate is produced by repeatedly patterning an insulating paste layer by a photolithography method and then patterning a conductor layer by a photolithography method, thereby forming an insulating paste layer, a coil conductor layer, a connecting conductor layer, and an external conductor layer into a predetermined laminated structure.

[0108] The insulating paste layer can be patterned, for example, by the following method: First, a photosensitive insulating paste containing a glass material mainly composed of borosilicate glass is applied by screen printing or the like to form an insulating paste layer, and the formed insulating paste layer is irradiated with ultraviolet light or the like through a photomask, and then developed with an alkaline solution or the like to form via holes, openings, and the like in the insulating paste layer.

[0109] The conductor layer can be patterned, for example, by the following method: First, 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 conductive paste layer, and the formed conductive paste layer is irradiated with ultraviolet light or the like through a photomask, and then developed with an alkaline solution or the like to form a coil conductor layer, an external conductor layer, an extraction conductor layer connected to the coil conductor layer and the external conductor layer, and the like.

[0110] In this case, by forming (stacking) multiple conductor patterns in multiple stages while changing the external shape of the pattern, the corner 40c of the internal wiring 25 located at either end in the direction parallel to the coil axis direction in the vertical cross section can be formed into a notch shape or a staircase shape described later.

[0111] Note that instead of exposure using a photomask, for example, DI exposure (also called direct image exposure or direct writing) without using a photomask may be performed.

[0112] The method for forming the conductor patterns of the coil conductor layer, the lead-out conductor layer, the connection conductor layer, and the external conductor layer is not limited to the photolithography method described above, and may be, for example, a method in which a conductive paste is printed and laminated using a screen printing plate having openings in the shape of the conductor pattern, a method in which a conductor film is formed by a sputtering method, a vapor deposition method, a foil pressing method, or the like, and then the conductor film is etched to have the shape of the conductor pattern, or a method in which a negative pattern is formed by a semi-additive method, a plating film is formed, and then unnecessary portions of the plating film are removed by etching or the like to have the shape of the conductor pattern.

[0113] The method for forming the conductor pattern in multiple stages is not particularly limited, and may be, for example, a method in which conductor patterns are repeatedly stacked by repeating a process using a photolithography method as described above, a method in which conductor patterns formed by a semi-additive method are repeatedly stacked, a method in which a conductor pattern formed by a semi-additive method and a conductor pattern formed by etching a plating film that has been separately grown by plating are stacked in no particular order, or a method in which a plating film formed by a semi-additive method is further grown by plating.

[0114] The conductive material constituting the conductor patterns of the coil conductor layer, the lead-out conductor layer, the connection conductor layer, and the external conductor layer is not limited to the photosensitive conductive paste containing Ag or the like as the main metal component, but may be, for example, a conductor containing a metal such as Ag, Au, Cu, etc. formed by a sputtering method, a vapor deposition method, a foil pressing method, a plating method, etc.

[0115] The method for forming the insulating paste layer is not limited to the above-mentioned photolithography method, and may be, for example, a method of pressing a sheet made of an insulating material, a method of spin-coating an insulating material, or a method of spray-coating an insulating material.

[0116] The method for forming the insulating paste layer having via holes and openings is not limited to the above-mentioned photolithography method, and may be, for example, a method in which an insulating film is formed by pressing a sheet made of an insulating material, spin coating an insulating material, spray coating an insulating material, or the like, and then the insulating film is subjected to laser processing, drilling processing, or the like to form via holes and openings.

[0117] The insulating material constituting the insulating paste layer is not limited to the above-mentioned glass material mainly composed of borosilicate glass, but may be, for example, a ceramic material, an organic material such as an epoxy resin, a fluororesin, or a polymer resin, a composite material such as a glass epoxy resin, etc. As the insulating material, a material having a small dielectric constant and a small dielectric loss is particularly preferable.

[0118] Thereafter, the mother laminate is cut by dicing or the like to be divided into a plurality of unfired laminates.

[0119] The unsintered laminate has an insulating paste lamination portion formed by laminating insulating paste layers, a coil conductor lamination portion formed by laminating coil conductor layers so that adjacent coil conductor layers are electrically connected via connecting conductor layers, and an external conductor lamination portion formed by laminating external conductor layers.

[0120] When the green laminate is cut into individual pieces, the external conductor laminate portion is exposed at two locations on at least the side surface of the insulating paste laminate portion included in the cut surface of the green laminate.

[0121] Next, the green laminate is fired to produce a laminate.

[0122] When the green laminate is fired, the insulating paste layers become insulating layers, and the insulating paste laminate portion becomes the element body 10. When the green laminate is fired, the coil conductor layers become coil wiring, and the coil conductor laminate portion becomes the coil 20. When the green laminate is fired, one of the two external conductor laminate portions becomes part of the first external electrode 30a, and the other becomes part of the second external electrode 30b.

[0123] Next, the corners and ridges of the element body 10 may be rounded by, for example, barrel polishing the obtained laminate.

[0124] Finally, the two fired external conductor laminated parts are used as base electrodes, and Ni-plated electrodes and Sn-plated electrodes are formed in that order on the surfaces of the respective base electrodes by plating. The thicknesses of the Ni-plated electrodes and Sn-plated electrodes are, for example, 2 μm or more and 10 μm or less, respectively.

[0125] In this manner, the first external electrode 30a and the second external electrode 30b are formed, each having a base electrode, a Ni-plated electrode, and a Sn-plated electrode in this order from the surface side of the element body 10. In this case, in the first external electrode 30a, the base electrode may be integral with the surface of the element body 10 (the end face 11a and the bottom face 12b of the element body 10 in FIG. 1), and the Ni-plated electrode and the Sn-plated electrode may protrude from the surface of the element body 10 (the end face 11a and the bottom face 12b of the element body 10 in FIG. 1) so as to cover the base electrode. In addition, in the second external electrode 30b, the base electrode may be integral with the surface of the element body 10 (the end face 11b and the bottom face 12b of the element body 10 in FIG. 1), and the Ni-plated electrode and the Sn-plated electrode may protrude from the surface of the element body 10 (the end face 11b and the bottom face 12b of the element body 10 in FIG. 1) so as to cover the base electrode.

[0126] The method for forming the external electrode is not limited to the method of plating the external conductor lamination portion exposed on the cut surface (at least the side surface of the insulating paste lamination portion) of the unsintered laminate as described above, but may also be a method of exposing the external conductor lamination portion on the cut surface (at least the side surface of the insulating paste lamination portion) of the unsintered laminate as described above, and then immersing (dipping) the exposed portion of the external conductor lamination portion in a conductive paste, or forming a film of conductive paste on the exposed portion of the external conductor lamination portion by a sputtering method, and then performing a plating process.

[0127] In this manner, the inductor component 1A is manufactured.

[0128] The inductor component 1A is manufactured to have, for example, 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.

[0129] [Embodiment 2] In the inductor element according to the second embodiment of the present invention, the number of laminations in the internal wiring is 3. Other than this, the inductor element according to the second embodiment of the present invention is similar to the inductor element according to the first embodiment of the present invention.

[0130] FIG. 5 is a schematic perspective view showing an example of an inductor component according to the second embodiment of the present invention.

[0131] 5, the internal wiring 25 includes a third internal wiring 25c in addition to a first internal wiring 25a and a second internal wiring 25b. That is, the internal wiring 25 includes, in a direction parallel to the coil axis direction, the first internal wiring 25a located at one end, the second internal wiring 25b located at the other end, and the third internal wiring 25c located between the first internal wiring 25a and the second internal wiring 25b.

[0132] The third internal wiring 25c is the internal wiring 25 that is not located at the end in the direction parallel to the coil axis direction, and is located at the center of the internal wiring 25 in the coil axis direction.

[0133] The third internal wiring 25c includes the third coil wiring 21c between the first coil wiring 21a and the second coil wiring 21b in the coil axial direction.

[0134] In this embodiment, the coil 20 is formed by stacking a plurality of coil wirings, including a first coil wiring 21a, a second coil wiring 21b, and a third coil wiring 21c, in the coil axial direction and electrically connecting them. That is, the first coil wiring 21a, the second coil wiring 21b, and the third coil wiring 21c each constitute the coil 20.

[0135] The third coil wiring 21c may have a single-layer structure or a multi-layer structure.

[0136] FIG. 6 is a schematic cross-sectional view showing an example of a cross section along a line segment a1-a2 of the inductor component shown in FIG. 5. FIG. 7 is a schematic cross-sectional view showing an example of a cross section along a line segment b1-b2 of the inductor component shown in FIG. 5. Both FIG. 6 and FIG. 7 show vertical cross sections. More specifically, FIG. 6 shows a vertical cross section along the length direction L and width direction W of the inductor component 1B shown in FIG. 5, i.e., a vertical cross section including the first coil wiring 21a, the second coil wiring 21b, and the third coil wiring 21c, of the LW plane. FIG. 7 shows a vertical cross section along the width direction W and height direction T of the inductor component 1B shown in FIG. 5, i.e., a vertical cross section including the first coil wiring 21a, the second coil wiring 21b, and the third coil wiring 21c, of the WT plane.

[0137] 6 and 7 indicate positions offset by 20 μm from the outer shape of element body 10.

[0138] As shown in Figures 6 and 7, similar to embodiment 1, in a vertical cross section, the internal wiring 25 located at either end in a direction parallel to the coil axis direction has a corner 40a adjacent to the corner 14 of the base body 10, the shape of which is different from the shapes of the remaining three corners 40b to 40d, and is a notch shape.

[0139] On the other hand, in this embodiment, the shape of the corner 43 of the third internal wiring 25c, which is the internal wiring 25 that is not located at the end in the direction parallel to the coil axis direction, particularly the third coil wiring 21c, does not include a notch shape or a step shape or curved shape described later in vertical cross section. Therefore, the shape of the third internal wiring 25c can be a shape (e.g., rectangular shape) that can increase the cross-sectional area of ​​the third internal wiring 25c. Therefore, the Q value of the inductor component 1A can be further improved.

[0140] Since the third internal wiring 25c is located at a position facing the flat surface of the element body 10, it will not be exposed from the corners 14 of the element body 10 even if it does not have a shape such as a notch.

[0141] The third internal wiring 25c has four corners 43, and all of the corners 43 of the third internal wiring 25c have the same shape, for example, a right-angle shape as shown in FIGS.

[0142] In this embodiment, as in embodiment 1, in a vertical cross section, the corner 40a of the internal wiring 25 located at the end closest to the corner 14 of the element body 10 preferably has at least one corner 50, and more preferably has at least two corners, the distance between which is less than the side gap of the product or less than 20 μm (see Figures 6 and 7) and between which the corner 40a and the corner 14 of the element body 10 is less than the side gap of the product or less than 20 μm (see Figures 6 and 7).

[0143] In the example shown in FIG. 6, there are 2×4 corners (total of 8 corners) of the internal wiring 25 where the distance from the corner 14 of the element body 10 is 20 μm or less in the vertical cross section (LW plane).

[0144] In the example shown in FIG. 7, there are 2×3 corners (total of 6) of corners 50 of internal wiring 25 where the distance from corner 14 of element body 10 is 20 μm or less in the vertical cross section (WT surface).

[0145] [Embodiment 3] In the inductor component of embodiment 3 of the present invention, the coil axis direction of the coil is parallel to the height direction T, and in the vertical cross section, the internal wiring located at either end in the direction parallel to the coil axis direction includes an internal wiring whose corner adjacent to a corner of the element body has a stepped shape. Other than this, the inductor component of embodiment 3 of the present invention is similar to the inductor component of embodiment 2 of the present invention.

[0146] FIG. 8 is a schematic perspective view showing an example of an inductor component according to the third embodiment of the present invention.

[0147] 8, the height direction T is parallel to the coil axis direction of coil 20. That is, in inductor component 1C, the surface of element body 10 includes bottom surface 12b perpendicular to the coil axis direction, and top surface 12a opposing bottom surface 12b in height direction T parallel to the coil axis direction.

[0148] In inductor component 1C, bottom surface 12b of element body 10 is also the mounting surface. Therefore, in inductor component 1C, the mounting surface of element body 10, that is, bottom surface 12b of element body 10, is perpendicular to the coil axis direction.

[0149] The coil axis direction of the coil 20 is the direction in which the coil axis C of the coil 20 extends, and is perpendicular to the bottom surface 12b which is the mounting surface of the element body 10 as described above.

[0150] 8, the internal wiring 25 includes a first internal wiring 25a, a second internal wiring 25b, and a third internal wiring 25c. That is, in this embodiment, the number of layers of the internal wiring 25 is 3. The internal wiring 25 includes, in a direction parallel to the coil axis direction, a first internal wiring 25a located at one end, a second internal wiring 25b located at the other end, and a third internal wiring 25c located between the first internal wiring 25a and the second internal wiring 25b.

[0151] The first internal wiring 25a is the internal wiring 25 that is located at one end of the multiple internal wirings 25 in a direction parallel to the coil axis direction, and is located at the outermost position of the internal wiring 25 on the bottom surface 12b side of the base body 10 in the coil axis direction.

[0152] The first internal wiring 25a is connected to the first external electrode 30a.

[0153] The second internal wiring 25b is the internal wiring 25 that is located at the other end of the multiple internal wirings 25 in a direction parallel to the coil axis direction, and is located at the outermost position of the internal wiring 25 on the top surface 12a side of the base body 10 in the coil axis direction.

[0154] The second internal wiring 25b is connected to the second external electrode 30b.

[0155] The third internal wiring 25c is the internal wiring 25 that is not located at the end in the direction parallel to the coil axis direction, and is located at the center of the internal wiring 25 in the coil axis direction.

[0156] In the present embodiment, the coil 20 is also formed by stacking a plurality of coil wirings, including a first coil wiring 21a, a second coil wiring 21b, and a third coil wiring 21c, in the coil axial direction and electrically connecting them. That is, the first coil wiring 21a, the second coil wiring 21b, and the third coil wiring 21c each constitute the coil 20.

[0157] FIG. 9 is a schematic cross-sectional view showing an example of a cross section along a line segment a1-a2 of the inductor component shown in FIG. 8. FIG. 10 is a schematic cross-sectional view showing an example of a cross section along a line segment b1-b2 of the inductor component shown in FIG. 9. Both FIG. 9 and FIG. 10 show vertical cross sections. More specifically, FIG. 9 shows a vertical cross section along the length direction L and height direction T of the inductor component 1C shown in FIG. 8, i.e., a vertical cross section of the LT plane including the first coil wiring 21a, the second coil wiring 21b, and the third coil wiring 21c. FIG. 10 shows a vertical cross section along the width direction W and height direction T of the inductor component 1C shown in FIG. 8, i.e., a vertical cross section of the WT plane including the first coil wiring 21a, the second coil wiring 21b, and the third coil wiring 21c.

[0158] 9 and 10 indicate positions offset by 20 μm from the outer shape of element body 10.

[0159] As shown in Figures 9 and 10, similarly to embodiments 1 and 2, in a vertical cross section, the second internal wiring 25b located at the other end in a direction parallel to the coil axis direction, particularly the second coil wiring 21b, has a corner 42a adjacent to the corner 14 of the base body 10, the shape of which is different from the shapes of the remaining three corners 42b to 42d.

[0160] On the other hand, in a vertical cross section, the shape of the first internal wiring 25a located at one end in a direction parallel to the coil axis direction, particularly the first coil wiring 21a, does not include a notched shape or a stepped or curved shape described below.

[0161] In this embodiment, the corner 42a of the second internal wiring 25b adjacent to the corner 14 of the element body 10 has a stepped shape. This allows the cross-sectional area of ​​the internal wiring 25 located at the extreme end to be larger than with a notched shape, thereby further reducing Rdc. This makes it possible to further improve the Q value of the inductor component 1A, particularly the Q value at low frequencies.

[0162] Here, the term "step-like" refers to a step-like shape having two or more steps as shown in Figs. 9 and 10, and does not include a step-like shape having one step.

[0163] In the example shown in FIG. 9 and FIG. 10, the staircase shape of the corner portion 42a has two steps, but it may have three or more steps.

[0164] In this embodiment, as in embodiment 1, in a vertical cross section, the corner 40a of the internal wiring 25 located at the end closest to the corner 14 of the element body 10 preferably has at least one corner 50, and more preferably has at least two corners, the distance between which is less than the side gap of the product or less than 20 μm (see Figures 9 and 10) and between which the corner 40a and the corner 14 of the element body 10 is less than the side gap of the product or less than 20 μm (see Figures 9 and 10).

[0165] In the example shown in FIG. 9, in the vertical cross section (LT plane), there are 3×2 corners+1 corner (total of 7 corners) 50 of the internal wiring 25 where the distance from the corner 14 of the element body 10 is 20 μm or less.

[0166] In the example shown in FIG. 10, in the vertical cross section (WT surface), there are 3×2 corners+1 corner (total of 7 corners) 50 of the internal wiring 25 where the distance from the corner 14 of the element body 10 is 20 μm or less.

[0167] [Embodiment 4] In the inductor component of the fourth embodiment of the present invention, the internal wiring located at either end in a direction parallel to the coil axis direction in a vertical cross section has a curved corner adjacent to a corner of the element body. Other than this, the inductor component of the fourth embodiment of the present invention is similar to the inductor component of the second embodiment of the present invention.

[0168] Fig. 11 is a cross-sectional schematic diagram showing an example of an inductor component according to embodiment 4 of the present invention. Fig. 11 corresponds to a cross section taken along line segment a1-a2 of the inductor component shown in Fig. 5. That is, Fig. 11 shows a vertical cross section. More specifically, Fig. 11 shows a vertical cross section taken along the length direction L and width direction W of the inductor component, i.e., a vertical cross section of the LW plane that includes the first coil wiring, the second coil wiring, and the third coil wiring.

[0169] In the inductor component 1D shown in FIG. 11, as in embodiments 1 to 3, in a vertical cross section, the internal wiring 25 located at either end in a direction parallel to the coil axis direction has a corner 40a adjacent to corner 14 of the base body 10, the shape of which is different from the shapes of the remaining three corners 40b to 40d.

[0170] On the other hand, in this embodiment, the shape of the corner 40a adjacent to the corner 14 of the element body 10 is curved. Therefore, compared with a notch shape or a step shape, the cross-sectional area of ​​the internal wiring 25 located at the end can be made larger, and Rdc can be further reduced. Therefore, it is possible to further improve the Q value of the inductor component 1A, particularly the Q value at low frequencies.

[0171] Fig. 12 is a schematic cross-sectional view showing an example of a corner of the element body and its vicinity in the inductor component shown in Fig. 11. Note that in Figs. 11 and 12, the dashed lines indicate positions offset by 20 µm from the outer shape of element body 10.

[0172] In this embodiment, as in embodiment 1, in a vertical cross section, the corner 40a of the internal wiring 25 located at the end closest to the corner 14 of the element body 10 preferably has at least one corner 50, and more preferably has at least two corners, such that the distance d (see Figure 12) between the corner 14 of the element body 10 is less than the side gap of the product or less than 20 μm (see Figures 11 and 12).

[0173] In the example shown in FIG. 11, in the vertical cross section (LW plane), there are 1×4 corners (total of 4 corners) of the internal wiring 25 where the distance from the corner 14 of the element body 10 is 20 μm or less.

[0174] The inductor component 1D is manufactured by, for example, photolithography, as in the first embodiment.

[0175] In this embodiment, in patterning the conductor layer, multiple conductor patterns are formed (stacking) in multiple stages while gradually changing the outer shape of the pattern, so that the corner 40c of the internal wiring 25 located at the endmost end in the vertical cross section can be formed into a curved shape.

[0176] In the above-mentioned second to fourth embodiments, the number of layers of the internal wiring is three, but in the inductor component of the present invention, the number of layers of the internal wiring may be four or more. In that case, it is preferable that all the internal wirings other than the internal wiring located at either end in the direction parallel to the coil axis direction have no notch shape, step shape, or curved shape in vertical cross section, and the shape of the four corners is the same shape (for example, a right angle).

[0177] The present specification discloses the following:

[0178] <1> A rectangular parallelepiped element body including a pair of end faces opposed to each other in a length direction, a top face and a bottom face opposed to each other in a height direction, and a pair of side faces opposed to each other in a width direction; an internal wiring provided inside the element body and including a coil wound in a spiral shape along a coil axis direction; a first external electrode electrically connected to one end of the internal wiring and provided on one of the pair of end surfaces; a second external electrode electrically connected to the other end of the internal wiring and provided on the other of the pair of end faces, An inductor component characterized in that, in a cross section parallel to the coil axis direction and perpendicular to the direction in which the internal wiring extends, the internal wiring has four corners, and the internal wiring located at either end in a direction parallel to the coil axis direction includes an internal wiring whose corner shape adjacent to a corner of the element body is different from the shapes of the remaining three corners.

[0179] <2> In the cross section, the shape of the corner portion adjacent to a corner portion of the element body is a notch shape, a stepped shape, or a curved shape. <1> 2. An inductor component according to claim 1 .

[0180] <3> the internal wiring includes, in a direction parallel to the coil axis direction, a first internal wiring located at one end, a second internal wiring located at the other end, and a third internal wiring located between the first internal wiring and the second internal wiring, In the cross section, the shape of the corner of the third internal electrode does not include any of a notch shape, a step shape, and a curved shape. <1> or <2> 2. An inductor component according to claim 1 .

[0181] <4> In the cross section, the corner portion adjacent to a corner portion of the element body has at least one corner portion whose distance from the corner portion to the element body is equal to or smaller than a side gap of a product or equal to or smaller than 20 μm. <1> ~ <3> 2. An inductor component according to claim 1 .

[0182] <5> In the cross section, the corners adjacent to the corners of the element body have at least two corners per corner of the element body, and the distance between the corners and the corners is equal to or less than a side gap of a product or equal to or less than 20 μm. <4> 2. An inductor component according to claim 1 . [Explanation of symbols]

[0183] 1A, 1B, 1C, 1D inductor components 10 Base 11a, 11b End surface of element 12a Top surface of the body 12b Bottom of the body 13a, 13b Side of the body 14 Corner of the body 15 Flat surface of the body 16 Body connection 20 Coil 21a First coil wiring 21b Second coil wiring 21c 3rd coil wiring 22a 1st lead out wiring 22b 2nd lead out wiring 23a Wiring portion of first coil wiring 23b Wiring portion of second coil wiring 25 Internal wiring 25a 1st internal wiring 25b 2nd internal wiring 25c 3rd internal wiring 30a 1st external electrode 30b 2nd external electrode 40a~40d Internal wiring corners 41a to 41d Corners of first coil wiring 42a to 42d Corners of second coil wiring 43 Corner of the third internal wiring 50 Corner of internal wiring (corner) adjacent to the corner of the element 60 Connecting conductor (via) C Coil shaft L Length direction T Height direction W Width direction

Claims

1. a rectangular parallelepiped element body including a pair of end faces opposed to each other in a length direction, a top face and a bottom face opposed to each other in a height direction, and a pair of side faces opposed to each other in a width direction; an internal wiring provided inside the element body and including a coil wound in a spiral shape along a coil axis direction; a first external electrode electrically connected to one end of the internal wiring and provided on one of the pair of end surfaces; a second external electrode electrically connected to the other end of the internal wiring and provided on the other of the pair of end faces, An inductor component characterized in that, in a cross section parallel to the coil axis direction and perpendicular to the direction in which the internal wiring extends, the internal wiring has four corners, and the internal wiring located at either end in a direction parallel to the coil axis direction includes an internal wiring whose corner shape adjacent to a corner of the element body is different from the shapes of the remaining three corners.

2. 2. The inductor component according to claim 1, wherein in the cross section, the corner portion adjacent to a corner portion of the element body has a notch shape, a stepped shape, or a curved shape.

3. the internal wiring includes, in a direction parallel to the coil axis direction, a first internal wiring located at one end, a second internal wiring located at the other end, and a third internal wiring located between the first internal wiring and the second internal wiring, 3 . The inductor component according to claim 1 , wherein in the cross section, the shape of the corner of the third internal electrode does not include any of a notch shape, a step shape, and a curved shape.

4. 3. The inductor component according to claim 1, wherein in the cross section, the corner adjacent to a corner of the element body has at least one corner whose distance from the corner of the element body is equal to or less than a side gap of the product or equal to or less than 20 μm.

5. 5. The inductor component according to claim 4, wherein in the cross section, the corners adjacent to the corners of the element body have at least two corners per corner of the element body, the distance between the corners being equal to or less than a side gap of the product or equal to or less than 20 μm.

Images