Multilayer inductor

Abstract

To provide a multilayer inductor with which the inductance value and Q value are improved.SOLUTION: A multilayer inductor 1 comprises: an element body 10 having a first end surface 11 and a second end surface 12 opposed to each other in a first direction D1; a first external electrode 21 provided on the first end surface; a second external electrode 22 provided on the second end surface; an internal conductor 30 provided in the inside of the element body and wound around along a coil axis direction C orthogonal to the first direction; a first lead-out conductor 41 provided in the inside of the element body 10, for connecting the internal conductor and the first external electrode together; and a second lead-out conductor 42 provided in the inside of the element body, for connecting the internal conductor and the second external electrode together. When viewed in the planar perspective from the coil axis direction, a linear line extended from a first boundary 51 which is a boundary between the first lead-out conductor and the internal conductor in the first direction does not overlap a second boundary 52 which is a boundary between the second lead-out conductor and the internal conductor, and the second lead-out conductor has a curved shape protruding in a direction to separate from a linear line extended from the first boundary in the first direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a laminated inductor. [Background technology]

[0002] Patent Document 1 describes a laminated chip common mode choke coil in which multiple magnetic sheets with conductor patterns formed on their surfaces are stacked, and the conductor patterns are connected by through holes to form a pair of coils, and the ends of each coil are extended to different positions on the outer edge of the side of the magnetic sheet to form extraction electrodes, and the laminated chip common mode choke coil is characterized in that the extraction electrodes of each coil are formed wide at the edge of the side.

[0003] Patent Document 2 describes a laminated inductor in which electrical insulating layers and conductor patterns are alternately laminated, and the ends of each conductor pattern are connected in sequence to form a coil overlapping in the lamination direction in an electrical insulating layer body, and both ends of this coil are connected to external electrodes via lead conductors, respectively, and the laminated inductor is mounted on a substrate, characterized in that the length of each lead conductor is increased or decreased depending on the height of the lead conductor above the substrate, so that the inductance values ​​from the substrate to each lead conductor are matched.

[0004] Patent document 3 describes a multilayer chip inductor characterized in that a spiral coil is disposed inside a magnetic body, an extraction portion connecting this coil to an external terminal electrode formed on the end surface of the chip is disposed near the chip surface independent of the spiral circumferential pattern that constitutes the coil, and this extraction portion is conductively connected to the beginning and end of the coil by thin columnar electrode layers. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-190364 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-126923 [Patent Document 3] Japanese Utility Model Application Publication No. 5-69915 Summary of the Invention [Problem to be solved by the invention]

[0006] In the common mode choke coil shown in FIG. 7 of Patent Document 1 and the laminated inductor shown in FIG. 1(b) of Patent Document 2, when viewed from the axial direction of the coil, the lead conductors on both sides extend on the same straight line as the coil. When the lead conductors on both sides are arranged so that they extend on the same straight line as the coil, there is little freedom in the arrangement of the connection between the lead conductor and the internal conductor. Therefore, it is difficult to adjust electrical characteristics such as the inductance value by adjusting the arrangement of the connection between the lead conductor and the internal conductor.

[0007] Furthermore, in the multilayer chip inductor shown in Figure 5 of Patent Document 3, when viewed from the coil axis direction, one of the lead conductors extends in the same direction as the winding direction of the internal conductor (the direction in which the coil turns), while the other extends in the opposite direction to the winding direction of the internal conductor. When the lead conductor extends in the opposite direction to the winding direction of the internal conductor, the direction of current flow changes abruptly at the connection between the lead conductor and the internal conductor. This may result in a deterioration of electrical characteristics such as the Q value (L: inductance value, R: resistance value, f: frequency) expressed as Q = 2πfL / R.

[0008] The present invention has been made to solve the above problems, and has an object to provide a laminated inductor that can improve the inductance value and Q value. [Means for solving the problem]

[0009] The laminated inductor of the present invention comprises an element body having a first end face and a second end face opposing each other in a first direction, a first external electrode provided on the first end face, a second external electrode provided on the second end face, an internal conductor provided inside the element body and wound along a coil axis direction perpendicular to the first direction, a first extraction conductor provided inside the element body and connecting the internal conductor to the first external electrode, and a second extraction conductor provided inside the element body and connecting the internal conductor to the second external electrode, wherein when viewed from the coil axis direction, a straight line extending in the first direction through a first boundary portion that is the boundary between the first extraction conductor and the internal conductor does not overlap with a second boundary portion that is the boundary between the second extraction conductor and the internal conductor, and the second extraction conductor has a curved shape that is convex in a direction away from the straight line extending in the first direction through the first boundary portion. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a laminated inductor that can improve the inductance value and Q value. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic perspective view showing an example of a laminated inductor according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an example of an exploded perspective view of the laminated inductor shown in FIG. [Figure 3] FIG. 3 is a perspective view of the laminated inductor shown in FIG. 1 in the coil axis direction. [Figure 4] FIG. 4 is a schematic diagram showing an example of the first boundary portion. [Figure 5] FIG. 5 is a schematic diagram showing another example of the first boundary portion. [Figure 6] FIG. 6 is a perspective view of a laminated inductor according to a second embodiment of the present invention, seen in the coil axis direction. [Figure 7] FIG. 7 is a perspective view of a laminated inductor according to a third embodiment of the present invention, seen in the coil axis direction. [Figure 8]FIG. 8 is a perspective view of a laminated inductor according to a fourth embodiment of the present invention, seen in the coil axis direction. [Figure 9] FIG. 9 is a schematic perspective view showing an example of a laminated inductor according to the fifth embodiment of the present invention. [Figure 10] FIG. 10 is an example of an exploded perspective view of the laminated inductor shown in FIG. [Figure 11] FIG. 11 is another example of an exploded perspective view of the laminated inductor shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] The laminated inductor 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 spirit of the present invention. Furthermore, a combination of multiple individual preferred configurations described below also constitutes the present invention.

[0013] The following embodiments are merely examples, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. From the second embodiment onwards, descriptions of matters common to the first embodiment will be omitted, and differences will be mainly described. In particular, similar effects due to similar configurations will not be mentioned one after the other for each embodiment.

[0014] In the following description, when no particular distinction is made between the embodiments, they will simply be referred to as "the laminated inductor of the present invention."

[0015] The drawings shown below are schematic diagrams, and the dimensions, aspect ratio, scale, etc. may differ from those of the actual product.

[0016] In this specification, terms indicating the relationship between elements (e.g., "parallel," "perpendicular," "orthogonal," etc.) and terms indicating the shape of elements not only mean the literal and strict form, but also mean a range that is substantially equivalent, for example, a range that includes a difference of about a few percent.

[0017] [First embodiment] An example of the laminated inductor of the present invention will be described below as a laminated inductor according to a first embodiment of the present invention.

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

[0019] The multilayer inductor 1 shown in FIG. 1 includes an element body 10, a first external electrode 21, and a second external electrode 22.

[0020] In this specification, the first direction, the second direction, and the third direction are defined as D1, D2, and D3, respectively, as shown in Figure 1 etc. Here, the first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other.

[0021] As shown in Figure 1, in the laminated inductor 1, the surface of the element body 10 includes a first end face 11 and a second end face 12 that face each other in a first direction D1, a first side face 13 and a second side face 14 that face each other in a second direction D2, and a first main face 15 and a second main face 16 that face each other in a third direction D3.

[0022] The first end face 11 and the second end face 12 of the element body 10 do not need to be strictly perpendicular to the first direction D1. Furthermore, the first side face 13 and the second side face 14 of the element body 10 do not need to be strictly perpendicular to the second direction D2. Furthermore, the first main face 15 and the second main face 16 of the element body 10 do not need to be strictly perpendicular to the third direction D3.

[0023] As shown in FIG. 1, the element body 10 has, for example, a rectangular parallelepiped shape.

[0024] 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 ridges as described below.

[0025] It is preferable that the corners and ridges of the element body 10 are rounded. A corner of the element body 10 is a portion where three faces of the element body 10 intersect. A ridge of the element body 10 is a portion where two faces of the element body 10 intersect.

[0026] The first external electrode 21 is provided on the first end surface 11 of the element body 10. In the example shown in FIG. 1 , the first external electrode 21 is provided on a portion of the first end surface 11 of the element body 10, but the first external electrode 21 may also be provided on the entire first end surface 11 of the element body 10. In other words, the first external electrode 21 is exposed at the first end surface 11 of the element body 10.

[0027] 1 , the first external electrode 21 extends from the first end face 11 to the first main surface 15. The first external electrode 21 is exposed at a portion of the first end face 11 of the element body 10 and at a portion of the first main surface 15 of the element body 10. The first external electrode 21 may be provided only on the first end face 11.

[0028] The second external electrode 22 is provided on the second end face 12 of the element body 10. In the example shown in Fig. 1, the second external electrode 22 is provided on part of the second end face 12 of the element body 10, but the second external electrode 22 may also be provided on the entire second end face 12 of the element body 10. In other words, the second external electrode 22 is exposed at the second end face 12 of the element body 10.

[0029] 1 , the second external electrode 22 extends from the second end face 12 to the first main surface 15. The second external electrode 22 is exposed at a portion of the second end face 12 of the element body 10 and at a portion of the first main surface 15 of the element body 10. The second external electrode 22 may be provided only on the second end face 12.

[0030] In the laminated inductor 1, the first main surface 15 of the element body 10 serves as the mounting surface. More specifically, the first main surface 15 of the element body 10 is the mounting surface that faces an object to be mounted (for example, a substrate) when the laminated inductor 1 is mounted.

[0031] If the first external electrode 21 and the second external electrode 22 are each exposed on the first main surface 15 of the element body 10, which is the mounting surface, the mountability of the multilayer inductor 1 tends to improve.

[0032] FIG. 2 is an example of an exploded perspective view of the laminated inductor shown in FIG.

[0033] The element body 10 includes an insulator. The insulator is formed by stacking multiple insulating layers in a coil axis direction C. The coil axis direction C is parallel to the stacking direction of the element body 10. In the example shown in FIG. 2, the coil axis direction C is parallel to the third direction D3 and perpendicular to the first direction D1 and the second direction D2.

[0034] 2, the multiple insulating layers include insulating layer 17a, insulating layer 17b, insulating layer 17c, insulating layer 17d, insulating layer 17e, insulating layer 17f, insulating layer 17g, insulating layer 17h, and insulating layer 17i. Insulating layer 17a, insulating layer 17b, insulating layer 17c, insulating layer 17d, insulating layer 17e, insulating layer 17f, insulating layer 17g, insulating layer 17h, and insulating layer 17i are stacked in order from the first main surface 15 side toward the second main surface 16 side of element body 10 in coil axis direction C.

[0035] Note that multiple insulating layers are integrated together, and the boundaries between them may not appear clearly.

[0036] Examples of insulating materials that constitute the insulator (insulating layer) include glass materials containing borosilicate glass as a main component, ceramic materials, organic materials such as epoxy resins, fluororesins, and polymer resins, and composite materials such as glass epoxy resins. As the insulating material, materials with small dielectric constants and dielectric losses are particularly preferred.

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

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

[0039] The laminated inductor 1 further includes an internal conductor 30, a first lead conductor 41, and a second lead conductor .

[0040] The internal conductor 30 is provided inside the element body 10 and is wound along a coil axis direction C that is perpendicular to the first direction D1.

[0041] 2 has a so-called vertically wound structure. That is, in the multilayer inductor 1, the coil axis direction C is perpendicular to the first main surface 15, which is the mounting surface of the element body 10. The first external electrode 21 and the second external electrode 22 extend across the first main surface 15, which is the mounting surface of the vertically wound multilayer inductor 1.

[0042] In the example shown in FIG. 2, the internal conductor 30 includes a plurality of coil conductors 31 and a plurality of connecting conductors 32.

[0043] The multiple coil conductors 31 are electrically connected via multiple connection conductors 32, thereby forming a solenoid coil built into the element body 10.

[0044] 2, a coil conductor 31 is provided in each of insulating layers 17c, 17d, 17e, 17f, and 17g. A connecting conductor 32 is provided in each of insulating layers 17d, 17e, 17f, and 17g. Each connecting conductor 32 is provided so as to penetrate the corresponding insulating layer.

[0045] Examples of conductive materials that can be used to form the coil conductor 31 include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0046] The conductive materials forming the multiple coil conductors 31 may be the same as each other, may be different from each other, or may be partially different from each other.

[0047] The dimensions of the coil conductors 31 in the coil axis direction C, that is, the thicknesses of the coil conductors 31, may be the same as or different from one another, or may be partially different.

[0048] For multiple coil conductors 31, the dimensions in a direction perpendicular to the direction in which the coil conductors 31 extend when viewed from the coil axis direction C, i.e., the widths of the coil conductors 31, may be the same as each other, may be different from each other, or may be different in some areas.

[0049] When viewed from the coil axis direction C, it is preferable that the coil conductors 31 overlap each other.

[0050] When viewed from the coil axis direction C, the internal conductor 30 may have a shape consisting of only straight portions, a shape consisting of only curved portions, or a shape consisting of both straight and curved portions. For example, when viewed from the coil axis direction C, the internal conductor 30 may have a circular shape, an elliptical shape, an oval shape, or a polygonal shape. In the example shown in FIG. 2 , when viewed from the coil axis direction C, the internal conductor 30 has an oval shape.

[0051] Examples of conductive materials that form the connection conductor 32 include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0052] The conductive materials constituting the plurality of connecting conductors 32 may be the same as each other, may be different from each other, or may be partially different from each other.

[0053] The conductive material forming the connecting conductor 32 may be the same as or different from the conductive material forming the coil conductor 31 .

[0054] The first lead conductor 41 is provided inside the element body 10, and connects the internal conductor 30 and the first external electrode 21. In the example shown in Fig. 2, the first lead conductor 41 is provided on the insulating layer 17b.

[0055] The second lead conductor 42 is provided inside the element body 10 and connects the internal conductor 30 and the second external electrode 22. In the example shown in Fig. 2, the second lead conductor 42 is provided on the insulating layer 17h.

[0056] 2, a first lead conductor 41, an internal conductor 30, and a second lead conductor 42 are laminated in this order from one side to the other in the coil axis direction C. Specifically, the first lead conductor 41, the internal conductor 30, and the second lead conductor 42 are laminated in this order from the first main surface 15 side to the second main surface 16 side of the element body 10.

[0057] The internal conductor 30 and the first lead conductor 41 are connected via a first via conductor 61 , and the internal conductor 30 and the second lead conductor 42 are connected via a second via conductor 62 .

[0058] When the first extraction conductor 41 is connected to the internal conductor 30 through the first via conductor 61, the distance between the first extraction conductor 41 and the internal conductor 30 is increased, preventing short circuits and improving reliability. In addition, blocking of magnetic flux can be suppressed, improving the inductance value and Q value.

[0059] Similarly, when the second lead conductor 42 is connected to the internal conductor 30 through the second via conductor 62, the distance between the second lead conductor 42 and the internal conductor 30 increases, preventing short circuits and improving reliability. Also, the inductance value and Q value are improved because the blocking of magnetic flux can be suppressed.

[0060] The first via conductor 61 may be provided to penetrate one insulating layer or multiple insulating layers, and the second via conductor 62 may be provided to penetrate one insulating layer or multiple insulating layers.

[0061] Although not shown, the first lead conductor 41 and the internal conductor 30 do not have to be connected via a via conductor. That is, the first lead conductor 41 and the internal conductor 30 may be present on the same insulating layer and connected directly.

[0062] Although not shown, the second lead conductor 42 and the internal conductor 30 do not have to be connected via a via conductor. That is, the second lead conductor 42 and the internal conductor 30 may be present on the same insulating layer and connected directly.

[0063] Alternatively, one of the first extraction conductor 41 and the second extraction conductor 42 may be connected to the internal conductor 30 via a via conductor, and the other of the first extraction conductor 41 and the second extraction conductor 42 may be connected to the internal conductor 30 without via a via conductor.

[0064] FIG. 3 is a perspective view of the laminated inductor shown in FIG. 1 in the coil axis direction.

[0065] The first boundary 51 is the boundary between the first lead conductor 41 and the internal conductor 30. The definition of the first boundary 51 will be described later.

[0066] The second boundary 52 is the boundary between the second lead conductor 42 and the internal conductor 30. The definition of the second boundary 52 will be described later.

[0067] In the laminated inductor 1, when viewed from the coil axis direction, a straight line A extending from the first boundary 51 in the first direction D1 does not overlap with the second boundary 52, which is the boundary between the second extraction conductor 42 and the internal conductor 30.

[0068] Unlike the case where the straight line A extending from the first boundary 51 in the first direction D1 overlaps with the second boundary 52, which is the boundary between the second lead conductor 42 and the internal conductor 30, when the second boundary 52 does not need to overlap with the straight line A, the arrangement of the second boundary 52, which is the connection between the second lead conductor 42 and the internal conductor 30, can be adjusted. This makes it possible to adjust the length of the internal conductor 30 that becomes a coil. For example, compared to the case where the second boundary 52 overlaps with the straight line A, the second boundary 52 can be arranged so that the length of the internal conductor 30 that becomes a coil is longer, thereby improving the inductance value of the multilayer inductor 1.

[0069] Furthermore, in the laminated inductor 1, when seen from the coil axis direction, the second lead conductor 42 has a curved shape that is convex in a direction away from the straight line A that extends the first boundary portion 51 in the first direction D1.

[0070] When the second extraction conductor 42 has a curved shape that is convex in a direction away from the straight line A extending from the first boundary 51 in the first direction D1, the change in the direction of current flow at the second boundary 52 can be made gentle. Although not shown, for example, compared to a comparative example multilayer inductor in which the second extraction conductor 42 is extended from the position of the second boundary 52 in FIG. 3 so as to form a linear shape parallel to the straight line A, in the multilayer inductor 1 shown in FIG. 3, the change in the direction of current flow at the second boundary 52 can be made gentle. Therefore, it is possible to suppress obstruction of the current flow at the second boundary 52, and the Q value of the multilayer inductor 1 can be improved.

[0071] It is sufficient that the curved portion of the second extraction conductor 42 extending from the second boundary 52 is convex in a direction away from the straight line A extending through the first boundary 51 in the first direction D1. The entire second extraction conductor 42 does not need to be convex in a direction away from the straight line A extending through the first boundary 51 in the first direction D1. For example, the second extraction conductor 42 may have a first curved portion extending from the second boundary 52 and convex in a direction away from the straight line A extending through the first boundary 51 in the first direction D1, and a second curved portion extending from the first curved portion and not convex in a direction away from the straight line A extending through the first boundary 51 in the first direction D1. Alternatively, the second extraction conductor 42 may have a curved portion extending from the second boundary 52 and convex in a direction away from the straight line A extending through the first boundary 51 in the first direction D1, and a straight portion extending from the curved portion.

[0072] Furthermore, when the first end face 11 and the second end face 12 are not strictly parallel and the first direction D1 cannot be determined strictly, the first direction D1 may be determined as follows: The first direction D1 may be defined as a direction in which a straight line passing through the first end face 11 and the second end face 12 extends, in which the straight line extending from the first boundary 51 in that direction does not overlap with the second boundary 52, and in which the second extraction conductor 42 is convex in a direction away from the straight line extending from the first boundary 51 in that direction.

[0073] The first extraction conductor 41 preferably has a linear shape when seen through from the coil axis direction C. When the first extraction conductor 41 has a linear shape, the wiring is less curved, and the Q value of the multilayer inductor 1 can be further improved.

[0074] 3, the first extraction conductor 41 has a linear shape and extends parallel to the first direction D1. The first extraction conductor 41 does not have to have a linear shape and extend parallel to the first direction D1.

[0075] When viewed from the coil axis direction C, the first extraction conductor 41 has a linear shape, and of the first extraction conductor 41, the second extraction conductor 42, and the internal conductor 30, it is preferable that the first extraction conductor 41 is located closest to the first principal surface 15. With the above configuration, the opposing area between the extraction conductor and the external electrode can be designed to be small, reducing stray capacitance and improving high-frequency characteristics.

[0076] FIG. 4 is a schematic diagram showing an example of the first boundary portion.

[0077] Fig. 4 is a perspective view of the multilayer inductor in the coil axis direction, similar to Fig. 3. To simplify the explanation, Fig. 4 only shows the internal conductor 30 and the first lead conductor 41. Fig. 4 explains the definition of the first boundary 51, which is the boundary between the first lead conductor 41 and the internal conductor 30, as an example, but the second boundary 52, which is the boundary between the second lead conductor 42 and the internal conductor 30, is also defined in a similar manner.

[0078] When the laminated inductor is viewed in the coil axis direction, the cross section of the first extraction conductor 41 perpendicular to the center line of the first extraction conductor 41 at the point where the center line of the internal conductor 30 (the line indicated by M1 in Figure 4) and the center line of the first extraction conductor 41 (the line indicated by M2 in Figure 4) overlap is the first boundary portion 51.

[0079] Similarly, when the laminated inductor is viewed in the coil axis direction, the cross section of the second extraction conductor 42 perpendicular to the center line of the second extraction conductor 42 at the point where the center line of the internal conductor 30 and the center line of the second extraction conductor 42 overlap is the second boundary portion 52.

[0080] The center lines of the inner conductor 30, the first lead conductor 41 and the second lead conductor 42 are lines passing through the centers of the widths of the inner conductor 30, the first lead conductor 41 and the second lead conductor 42, respectively.

[0081] Since the first boundary 51 has the same width as the first lead conductor 41, the straight line A extending from the first boundary 51 in the first direction D1 actually has a strip shape.

[0082] 3, when a land is present at the first boundary 51 and the width of the first boundary 51 is larger than the width of other parts of the first extraction conductor 41, the width of the first boundary 51 may be determined assuming that no land is present. In other words, the width of the first boundary 51 may be set to the same width as the width of the part of the first extraction conductor 41 other than the land.

[0083] FIG. 5 is a schematic diagram showing another example of the first boundary portion.

[0084] 5, the first lead conductor 41 is connected to a curved portion of the internal conductor 30. Even when the first lead conductor 41 is connected to a curved portion of the internal conductor 30, the cross section of the first lead conductor 41 perpendicular to the center line of the first lead conductor 41 at the point where the center line of the internal conductor 30 (the line indicated by M1 in FIG. 5) and the center line of the first lead conductor 41 (the line indicated by M2 in FIG. 5) overlap becomes the first boundary portion 51.

[0085] [Second embodiment] FIG. 6 is a perspective view of a laminated inductor according to a second embodiment of the present invention, seen in the coil axis direction.

[0086] In the laminated inductor 2, the first side surface 13 and the second side surface 14 are opposed to each other in the first direction D1 and the second direction D2 perpendicular to the coil axis direction, similar to the laminated inductor 1.

[0087] 6, when viewed from the coil axis direction, the first boundary 51 is located closer to the first side face 13 than the center of the element body 10, and the second boundary 52 is located closer to the second side face 14 than the center of the element body 10. In this case, the length of the internal conductor 30 that forms the coil can be further extended, thereby further improving the inductance value of the multilayer inductor 2.

[0088] When a straight line passing through the center of gravity of the element body 10 when viewed from the coil axis direction and parallel to the first direction D1 is taken as the center line of the element body 10 (the line indicated by CL in FIG. 6), if the first boundary 51 is located closer to the first side surface 13 than the center line CL of the element body 10, then it can be said that the first boundary 51 is located closer to the first side surface 13 than the center of the element body 10. Similarly, if the second boundary 52 is located closer to the second side surface 14 than the center line CL of the element body 10, then it can be said that the second boundary 52 is located closer to the second side surface 14 than the center of the element body 10. Note that the center of gravity here refers to the geometric center of gravity, without taking into account the specific gravities of the element body 10, the internal conductor 30, etc.

[0089] [Third embodiment] FIG. 7 is a perspective view of a laminated inductor according to a third embodiment of the present invention, seen in the coil axis direction.

[0090] 7, when viewed from the coil axis direction, the second lead conductor 42 extends at the second boundary 52 in a tangential direction to the turn of the internal conductor 30 at the second boundary 52. ​​In this case, the change in the current direction becomes more gradual, and the Q value can be further improved.

[0091] It is preferable that the first extraction conductor 41 also extends in a tangential direction at the first boundary 51 around the internal conductor 30. In this case, the change in the current direction becomes more gradual, and the Q value can be further improved.

[0092] The tangent line (the line indicated by L1 in FIG. 7) at the first boundary 51 of the circumference of the internal conductor 30 refers to the tangent line at the first boundary 51 to the center line of the internal conductor 30 when viewed from the coil axis direction. That is, at the first boundary 51, a straight line extending in the direction in which the center line of the internal conductor 30 extends is the tangent line L1 at the first boundary 51 of the circumference of the internal conductor 30.

[0093] Similarly, the tangent line at the second boundary 52 of the circumference of the internal conductor 30 (the line indicated by L2 in FIG. 7) refers to the tangent line at the second boundary 52 of the center line of the internal conductor 30 when viewed from the coil axis direction. That is, at the second boundary 52, a straight line extending in the direction in which the center line of the internal conductor 30 extends is the tangent line L2 at the second boundary 52 of the circumference of the internal conductor 30.

[0094] The centerline of the inner conductor 30 is a line passing through the center of the width of the inner conductor 30 .

[0095] [Fourth embodiment] FIG. 8 is a perspective view of a laminated inductor according to a fourth embodiment of the present invention, seen in the coil axis direction.

[0096] 8, when viewed from the coil axis direction, the second extraction conductor 42 is connected perpendicularly to the second external electrode 22 at the connection portion with the second external electrode 22. In this case, current concentration at the connection portion between the second external electrode 22 and the second extraction conductor 42 can be suppressed, thereby further improving the Q value.

[0097] When viewed from the coil axis direction, the second extraction conductor 42 does not need to be connected strictly perpendicular to the second external electrode 22 at the connection portion with the second external electrode 22. For example, if the second extraction conductor 42 is connected to the second external electrode 22 so that the deviation from the perpendicular angle is within 5°, it can be said that the second extraction conductor 42 is connected perpendicular to the second external electrode 22 at the connection portion with the second external electrode 22.

[0098] Furthermore, when viewed from the coil axis direction, it is preferable that the first extraction conductor 41 is connected perpendicularly to the first external electrode 21 at the connection portion with the first external electrode 21. For example, when the first extraction conductor 41 is connected to the first external electrode 21 so that the deviation from the perpendicular angle is within 5°, it can be said that the first extraction conductor 41 is connected perpendicularly to the first external electrode 21 at the connection portion with the first external electrode 21.

[0099] [Fifth embodiment] FIG. 9 is a schematic perspective view showing an example of a laminated inductor according to the fifth embodiment of the present invention. FIG. 10 is an example of an exploded perspective view of the laminated inductor shown in FIG.

[0100] In the laminated inductor 5 shown in Figures 9 and 10, the base body 10 has a first side surface 13 and a second side surface 14 that face each other in a second direction D2 that is perpendicular to the first direction D1 and the coil axis direction C, and the first external electrode 21 extends from the first end face 11 to the first side surface 13, and the second external electrode 22 extends from the second end face 12 to the first side surface 13.

[0101] In the laminated inductor 1, the first side surface 13 of the element body 10 serves as the mounting surface.

[0102] 10, in the laminated inductor 5, the coil axis direction C is parallel to the lamination direction of the element body 10. In the example shown in Fig. 10, the coil axis direction C is parallel to the third direction D3 and perpendicular to the first direction D1 and the second direction D2.

[0103] 10 has a so-called horizontally wound structure. That is, in the multilayer inductor 5, the coil axis direction C is parallel to the first side surface 13, which is the mounting surface of the element body 10. The first external electrode 21 and the second external electrode 22 extend across the first side surface 13, which is the mounting surface of the horizontally wound multilayer inductor 5.

[0104] In the laminated inductor 5, the magnetic flux generated in the coil is not blocked by the external electrodes provided on the first side surface 13 or the mounting substrate, and therefore the inductance and Q value are improved.

[0105] [Manufacturing method for multilayer inductors] The laminated inductor 1 shown in FIGS. 1 and 2 is manufactured, for example, by the following method.

[0106] <Step of Producing Mother Laminate> As an example, the process of forming each insulating layer from insulating layer 17i toward insulating layer 17a to produce a mother laminate will be described below with reference to FIG.

[0107] FIG. 11 is another example of an exploded perspective view of the laminated inductor shown in FIG.

[0108] Fig. 2 illustrates a state in which each lead conductor and each internal conductor is provided on the surface of each insulating layer that faces the second principal surface 16. On the other hand, Fig. 11 illustrates a state in which each lead conductor and each internal conductor is provided on the surface of each insulating layer that faces the first principal surface 15 for the same structure as Fig. 2. The steps for producing the laminated inductor 1 shown in Fig. 11 will be described below.

[0109] First, an insulating paste layer is formed by repeatedly applying an insulating paste containing a glass material, etc., whose main component is borosilicate glass, by screen printing, etc. The insulating paste layer formed here will later become the insulating layer 17i.

[0110] Next, a photosensitive conductive paste layer is formed on the insulating paste layer by applying a photosensitive conductive paste, for example, mainly composed of a metal such as Ag, using screen printing or the like. Furthermore, the photosensitive 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 an external conductor layer and a second extension conductor layer on the insulating paste layer. In this manner, the external conductor layer and the second extension conductor layer are formed by photolithography. The external conductor layer formed here will later become part of each of the first external electrode 21 and the second external electrode 22. The same applies to the external conductor layers formed below. The second extension conductor layer formed here will later become the second extension conductor 42.

[0111] When forming the external conductor layer and the second lead conductor layer, 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] Next, a new insulating paste layer is formed on the already formed insulating paste layer by applying a photosensitive insulating paste containing a glass material, for example, primarily borosilicate glass, using screen printing or the like. The newly formed insulating paste layer is then irradiated with ultraviolet light or the like through a photomask, and then developed with an alkaline solution or the like to form via holes and openings in the insulating paste layer. In this manner, an insulating paste layer with multiple via holes and openings is formed by photolithography. The insulating paste layer formed here will later become insulating layer 17h. The via holes formed here overlap portions of the already formed second lead-out conductor layer. The openings formed here overlap the already formed external conductor layer.

[0113] When forming the insulating paste layer provided with the via holes and openings, for example, DI exposure without using a photomask may be performed instead of exposure using a photomask.

[0114] Next, a photosensitive conductive paste primarily composed of a metal such as Ag is applied by screen printing or the like to form a new photosensitive conductive paste layer inside the via holes and openings, while also forming it on the already formed insulating paste layer. The photosensitive conductive paste layer is then irradiated with ultraviolet light or the like through a photomask and then developed with an alkaline solution or the like to form a connecting conductor layer inside the via holes, while also forming a coil conductor layer connected to the connecting conductor layer on the insulating paste layer. Furthermore, a new external conductor layer connected to the already formed external conductor layer is formed inside the openings, while also forming a new external conductor layer on this external conductor layer. In this manner, the coil conductor layer, connecting conductor layer, and external conductor layer are formed by photolithography. The coil conductor layer formed here will later become the coil conductor 31. The connecting conductor layer formed here will later become the second via conductor 62.

[0115] When forming the coil conductor layer, the connection conductor layer, and the external conductor layer, for example, DI exposure without using a photomask may be performed instead of exposure using a photomask.

[0116] The above steps are then repeated to form insulating paste layers, coil conductor layers, connecting conductor layers, and external conductor layers into a predetermined laminated structure. The insulating paste layers formed here become insulating layers 17g, 17f, 17e, and 17d. The coil conductor layers formed here will later become coil conductor 31. The connecting conductor layers formed here will become connecting conductor 32.

[0117] Next, a new insulating paste layer is formed on the already formed insulating paste layer by applying a photosensitive insulating paste containing, for example, a glass material primarily composed of borosilicate glass using screen printing or the like. The newly formed insulating paste layer is then irradiated with ultraviolet light or the like through a photomask, and then developed with an alkaline solution or the like to form via holes and openings in the insulating paste layer. In this manner, an insulating paste layer with multiple via holes and openings is formed by photolithography. The insulating paste layer formed here will later become insulating layer 17c. The via holes formed here overlap portions of the already formed coil conductor layer. The openings formed here overlap the already formed external conductor layer.

[0118] When forming the insulating paste layer provided with the via holes and openings, for example, DI exposure without using a photomask may be performed instead of exposure using a photomask.

[0119] Next, a new photosensitive conductive paste layer is formed inside the via holes and openings, for example, by applying a photosensitive conductive paste primarily composed of a metal such as Ag, using screen printing or the like. The photosensitive conductive paste layer is then irradiated with ultraviolet light or the like through a photomask and then developed with an alkaline solution or the like. This forms a connecting conductor layer inside the via holes and a first extension conductor layer connected to the connecting conductor layer on the insulating paste layer. Furthermore, a new external conductor layer connected to the previously formed external conductor layer is formed inside the openings and a new external conductor layer is formed on the external conductor layer. In this manner, the connecting conductor layer, the external conductor layer, and the first extension conductor layer are formed by photolithography. The connecting conductor layer formed here will later become the first via conductor 61. The first extension conductor layer formed here will later become the first extension conductor 41.

[0120] When forming the connection conductor layer, the external conductor layer, and the first lead conductor layer, for example, DI exposure without using a photomask may be performed instead of exposure using a photomask.

[0121] Next, a new insulating paste layer is formed on the already formed insulating paste layer by applying a photosensitive insulating paste containing a glass material, for example, primarily borosilicate glass, using screen printing or the like. The newly formed insulating paste layer is then irradiated with ultraviolet light or the like through a photomask, and then developed with an alkaline solution or the like to form openings in the insulating paste layer. In this manner, an insulating paste layer with multiple openings is formed by photolithography. The insulating paste layer formed here will later become insulating layer 17b. The openings formed here overlap the already formed external conductor layer.

[0122] When forming the insulating paste layer provided with the openings, for example, DI exposure without using a photomask may be performed instead of exposure using a photomask.

[0123] Next, a new photosensitive conductive paste layer is formed inside the opening by, for example, applying a photosensitive conductive paste mainly composed of a metal such as Ag by screen printing or the like. Furthermore, the photosensitive conductive paste layer is irradiated with ultraviolet light or the like through a photomask, and then developed with an alkaline solution or the like, thereby forming a new external conductor layer connected to the previously formed external conductor layer inside the opening, and then forming a new external conductor layer on top of this external conductor layer. In this manner, the external conductor layer is formed by photolithography.

[0124] When forming the external conductor layer, instead of exposure using a photomask, for example, DI exposure without using a photomask may be performed.

[0125] Next, a new insulating paste layer is formed on the already formed insulating paste layer, for example, by applying a photosensitive insulating paste by screen printing or the like. Furthermore, the newly 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 openings in the insulating paste layer. In this manner, an insulating paste layer with multiple openings is formed by photolithography. The insulating paste layer formed here will later become the insulating layer 17a. The openings formed here overlap the already formed external conductor layer. Furthermore, openings are formed on the surface that will later provide the first main surface 15 of the element body 10 to provide external conductors that will later become part of the first external electrode 21 and second external electrode 22 exposed on the first main surface 15 of the element body 10.

[0126] When forming the insulating paste layer provided with the openings, for example, DI exposure without using a photomask may be performed instead of exposure using a photomask.

[0127] Next, a new photosensitive conductive paste layer is formed inside the opening by, for example, applying a photosensitive conductive paste containing Ag or other metal as a main component by screen printing or the like. Furthermore, the photosensitive conductive paste layer is irradiated with ultraviolet light or the like through a photomask and then developed with an alkaline solution or the like, thereby forming a new external conductor layer connected to the previously formed external conductor layer inside the opening, and a new external conductor layer is then formed on the previously formed external conductor layer. External conductor layers that will later become part of the first external electrode 21 and the second external electrode 22 exposed on the first main surface 15 of the element body 10 are formed on the surface that will later provide the first main surface 15 of the element body 10. The external conductor layers formed here may be formed to form an integral surface with the first main surface 15 of the element body 10, or may be formed to protrude from the first main surface 15 of the element body 10. In this manner, the external conductor layer is formed by photolithography.

[0128] When forming the external conductor layer, instead of exposure using a photomask, for example, DI exposure without using a photomask may be performed.

[0129] The development resolution limit of the above-mentioned photosensitive insulating paste is, for example, 3 μm or less when irradiated with ultraviolet light having a light source wavelength of 365 / 405 nm.

[0130] In this way, a mother laminate is produced.

[0131] The method for forming the conductor patterns of the coil conductor layer, the connection conductor layer, the external conductor layer, the first extraction conductor layer, and the second extraction 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, etc., and then the conductor film is etched to form the shape of the conductor pattern, or a method in which a negative pattern is formed by a semi-additive method, then a plating film is formed, and then unnecessary portions of the plating film are removed by etching, etc., to form the shape of the conductor pattern.

[0132] When forming the conductor patterns of the coil conductor layer, the connection conductor layer, the external conductor layer, the first lead conductor layer, and the second lead conductor layer, forming the conductor patterns in multiple stages allows for a high aspect ratio, thereby reducing loss due to resistance at high frequencies. The method for forming the conductor patterns in multiple stages is not particularly limited, and may include, for example, a method of repeatedly stacking conductor patterns by repeating steps using photolithography as described above, a method of repeatedly stacking conductor patterns formed by a semi-additive method, a method of stacking, in no particular order, 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, or a method of further growing a plating film formed by a semi-additive method by plating.

[0133] The conductive material constituting the conductor patterns of the coil conductor layer, the connection conductor layer, the external conductor layer, the first extraction conductor layer, and the second extraction conductor layer is not limited to the photosensitive conductive paste primarily composed of metals such as Ag as described above, but may also be a conductor containing metals such as Ag, Au, Cu, etc. formed by, for example, a sputtering method, a vapor deposition method, a foil pressing method, a plating method, etc.

[0134] The method for forming the insulating paste layer is not limited to the photolithography method described above, 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.

[0135] The method for forming the insulating paste layer having via holes and openings is not limited to the photolithography method described above, 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, or the like to form via holes and openings.

[0136] The insulating material constituting the insulating paste layer is not limited to the glass material containing borosilicate glass as the main component, 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 with a small dielectric constant and dielectric loss is particularly preferable.

[0137] <Process for forming element body, coil, and external electrodes> First, the mother laminate is cut by dicing or the like to be separated into a plurality of unfired laminates.

[0138] The unsintered laminate has an insulating paste laminate portion formed by laminating insulating paste layers, a coil conductor laminate portion formed by laminating coil conductor layers so that adjacent coil conductor layers are electrically connected via connecting conductor layers, an external conductor laminate portion formed by laminating external conductor layers, a first extraction conductor portion in which a first extraction conductor layer is present, and a second extraction conductor portion in which a second extraction conductor layer is present.

[0139] When the green laminate is cut into individual pieces, the external conductor laminated portion is exposed at two locations on the bottom surface of at least the insulating paste laminated portion included in the cut surface of the green laminate.

[0140] Next, the unfired laminate is fired to produce a laminate.

[0141] 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 internal conductor 30. When the green laminate is fired, one of the two external conductor laminate portions becomes part of the first external electrode 21, and the other becomes part of the second external electrode 22. When the green laminate is fired, the first extracted conductor portion becomes the first extracted conductor 41, and the second extracted conductor portion becomes the second extracted conductor 42.

[0142] Next, the obtained laminate may be subjected to, for example, barrel polishing to round the corners and ridges of the element body 10.

[0143] Finally, using the two fired external conductor laminated portions as base electrodes, Ni-plated electrodes and Sn-plated electrodes may be formed in this 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.

[0144] In this way, a first external electrode 21 and a second external electrode 22 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 21, the base electrode may be integral with the surface of the element body 10 (in FIG. 1, the first end face 11 and first main surface 15 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 first end face 11 and first main surface 15 of the element body 10) so as to cover the base electrode. In addition, in the second external electrode 22, the base electrode may be integral with the surface of the element body 10 (in FIG. 1, the second end face 12 and first main surface 15 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 second end face 12 and first main surface 15 of the element body 10) so as to cover the base electrode.

[0145] The first external electrode 21 and the second external electrode 22 may have only a base electrode without including a Ni-plated electrode and a Sn-plated electrode. Also, the first external electrode 21 and the second external electrode 22 may have another plated electrode such as Au instead of the Ni-plated electrode and the Sn-plated electrode.

[0146] The method for forming the external electrode is not limited to the method of plating the external conductor laminate portion exposed on the cut surface (at least the bottom surface of the insulating paste laminate portion) of the unsintered laminate as described above, but may also be a method of exposing the external conductor laminate portion on the cut surface (at least the bottom surface of the insulating paste laminate portion) of the unsintered laminate as described above, and then immersing (dipping) the exposed portion of the external conductor laminate portion in a conductive paste, or forming a film of conductive paste on the exposed portion of the external conductor laminate portion by a sputtering method, and then plating the same.

[0147] In this way, the laminated inductor 1 is manufactured.

[0148] The laminated inductor 1 is manufactured to have, for example, a 0402 (0.4 mm×0.2 mm×0.2 mm) size. The size of the laminated inductor 1 is not limited to the 0402 (0.4 mm×0.2 mm×0.2 mm) size.

[0149] The present specification discloses the following:

[0150] <1> an element body having a first end face and a second end face facing each other in a first direction; a first external electrode provided on the first end surface; a second external electrode provided on the second end surface; an internal conductor provided inside the element body and wound along a coil axis direction perpendicular to the first direction; a first lead conductor provided inside the element body and connecting the internal conductor and the first external electrode; a second lead conductor provided inside the element body and connecting the internal conductor and the second external electrode; A laminated inductor characterized in that, when viewed from the coil axis direction, a straight line extending in the first direction through a first boundary portion that is a boundary between the first extraction conductor and the internal conductor does not overlap with a second boundary portion that is a boundary between the second extraction conductor and the internal conductor, and the second extraction conductor has a curved shape that is convex in a direction away from the straight line extending in the first direction through the first boundary portion.

[0151] <2> the element body has a first side surface and a second side surface that face each other in a second direction perpendicular to the first direction and the coil axis direction, When viewed from the coil axis direction, the first boundary portion is located closer to the first side surface than the center of the element body, and the second boundary portion is located closer to the second side surface than the center of the element body. <1> The laminated inductor according to claim 1.

[0152] <3> When viewed from the coil axis direction, the first lead conductor has a linear shape. <1> or <2> The laminated inductor according to claim 1.

[0153] <4> When viewed from the coil axis direction, the second lead conductor extends, at the second boundary portion, in a tangential direction of the turn of the internal conductor at the second boundary portion. <1> ~ <3> 10. The laminated inductor according to claim 9, wherein

[0154] <5> When viewed from the coil axis direction, the second lead conductor is connected perpendicularly to the second external electrode at a connection portion with the second external electrode. <1> ~ <4> 10. The laminated inductor according to claim 9, wherein

[0155] <6> the first lead conductor, the internal conductor, and the second lead conductor are laminated in this order from one side to the other in the coil axis direction, the internal conductor and the first lead conductor are connected via a first via conductor; the internal conductor and the second lead conductor are connected via a second via conductor. <1> ~ <5> 10. The laminated inductor according to claim 9, wherein

[0156] <7> the element body has a first main surface and a second main surface that face each other in the coil axis direction, the first external electrode extends from the first end surface to the first main surface, The second external electrode extends from the second end surface to the first main surface. <1> ~ <6> 10. The laminated inductor according to claim 9, wherein

[0157] <8> When viewed from the coil axis direction, the first lead conductor has a linear shape, Among the first lead conductor, the second lead conductor, and the internal conductor, the first lead conductor is located closest to the first principal surface. <7> The laminated inductor according to claim 1.

[0158] <9> the element body has a first side surface and a second side surface that face each other in a second direction perpendicular to the first direction and the coil axis direction, the first external electrode extends from the first end surface to the first side surface, The second external electrode extends from the second end surface to the first side surface. <1> ~ <6> 10. The laminated inductor according to claim 9, wherein [Explanation of symbols]

[0159] 1, 2, 3, 4, 5 Multilayer inductor 10 Base 11 First end surface 12 Second end face 13 First aspect 14 Second aspect 15 First main surface 16 Second main surface 17a, 17b, 17c, 17d, 17e, 17f, 17g, 17h, 17i Insulation layer 21 1st external electrode 22 2nd external electrode 30 Inner conductor 31 Coil conductor 32 Connecting conductor 41 First lead conductor 42 Second lead conductor 51 First Boundary 52 Second Boundary 61 First via conductor 62 Second via conductor D1 1st direction D2 2nd direction D3 Third direction C Coil axis direction

Claims

1. an element body having a first end surface and a second end surface facing each other in a first direction; a first external electrode provided on the first end surface; a second external electrode provided on the second end surface; an internal conductor provided inside the element body and wound along a coil axis direction perpendicular to the first direction; a first lead conductor provided inside the element body and connecting the internal conductor and the first external electrode; a second lead conductor provided inside the element body and connecting the internal conductor and the second external electrode, a first boundary portion that is a boundary between the first lead conductor and the internal conductor, extending in the first direction, when viewed from the coil axis direction, does not overlap with a second boundary portion that is a boundary between the second lead conductor and the internal conductor, and the second lead conductor has a curved shape that is convex in a direction away from the first boundary portion that is an extension of the first direction.

2. the element body has a first side surface and a second side surface that face each other in a second direction that is orthogonal to the first direction and the coil axis direction, 2. The laminated inductor according to claim 1, wherein, when viewed from the coil axis direction, the first boundary portion is located closer to the first side surface than the center of the element body, and the second boundary portion is located closer to the second side surface than the center of the element body.

3. The multilayer inductor according to claim 1 , wherein the first lead conductor has a linear shape when seen through from the coil axial direction.

4. 3. The multilayer inductor according to claim 1, wherein, when viewed from the coil axis direction, the second lead conductor extends in a tangential direction at the second boundary around the internal conductor.

5. 3. The multilayer inductor according to claim 1, wherein, when viewed from the coil axis direction, the second lead conductor is connected perpendicularly to the second external electrode at a connection portion with the second external electrode.

6. the first lead conductor, the internal conductor, and the second lead conductor are laminated in this order from one side to the other in the coil axis direction, the internal conductor and the first lead conductor are connected via a first via conductor; The multilayer inductor according to claim 1 , wherein the internal conductor and the second lead conductor are connected to each other through a second via conductor.

7. the element body has a first main surface and a second main surface that face each other in the coil axis direction, the first external electrode extends from the first end surface to the first main surface, The multilayer inductor according to claim 1 , wherein the second external electrode extends from the second end face to the first main surface.

8. When viewed from the coil axis direction, the first lead conductor has a linear shape, The multilayer inductor according to claim 7 , wherein the first lead conductor is located closest to the first principal surface among the first lead conductor, the second lead conductor, and the internal conductor.

9. the element body has a first side surface and a second side surface that face each other in a second direction that is orthogonal to the first direction and the coil axis direction, the first external electrode extends from the first end surface to the first side surface, The multilayer inductor according to claim 1 , wherein the second external electrode extends from the second end face to the first side face.

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