Multilayer coil parts

Abstract

To provide a lamination type coil component that restrains occurrence of heat generation and electromigration in a lead-out conductor.SOLUTION: A lamination type coil component 1 includes an element body 10A in which multiple insulating layers P1 to Py are laminated, a coil 30A inside the element body, and an external electrode electrically connected to the coil on the surface of the element body. A plurality of laminated coil conductors Q1 to 14 is electrically connected through via conductors Sa2-d14 penetrating through the insulating layers in a lamination direction. The coil conductors have first parallel running sections Ma1 and Mb1 in which all the coil conductors of a first lamination portion Ea comprising a plurality of adjacent coil conductors containing the outermost coil conductor Q1 located at the outermost position in the lamination direction overlap with one another when viewed in the lamination direction. The first parallel running sections are connected in parallel using the via conductors. The outermost coil conductors are electrically connected to the same external conductor through first lead-out conductors 41a, b at one end of the first parallel running section, and through second lead-out conductors 42, b at the other end of the first parallel running section.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a multilayer coil component. [Background technology]

[0002] Patent Document 1 describes a rectangular parallelepiped laminate formed by stacking a plurality of insulator layers in a stacking direction, the laminate having a first side formed by connecting the outer edges of the plurality of insulator layers, and a coil provided in the laminate and formed by connecting a plurality of coil conductors by via hole conductors penetrating the insulator layers, the coil having a spiral shape progressing in the stacking direction while winding around, a first external electrode provided on at least the first side, and a second external electrode provided on the other side of the first external electrode in the stacking direction and provided on at least the first side, and the coil has at least a portion of m coil conductors aligned in the stacking direction aligned in a line. The electronic component disclosed includes a first parallel portion configured by connecting in a row, and a second parallel portion configured by connecting in parallel at least a portion of n coil conductors arranged in the stacking direction, where m and n are natural numbers, n is greater than m, and the proportion of the number of the first parallel portions to the total number of the first parallel portions and the second parallel portions in a first region that overlaps with the first external electrode when viewed in a plane from the normal direction to the first side surface is higher than the proportion of the number of the first parallel portions to the total number of the first parallel portions and the second parallel portions in a second region that does not overlap with the first external electrode and the second external electrode when viewed in a plane from the normal direction to the first side surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 022889 Summary of the Invention [Problem to be solved by the invention]

[0004] Fig. 2 of Patent Document 1 discloses an electronic component in which two or three coil conductors are connected in parallel. It is also described that the electronic component shown in Fig. 2 of Patent Document 1 has a coil and an external electrode connected via an extraction conductor composed of a plurality of via-hole conductors penetrating an insulator layer. However, the inventors have found through their investigation that the electronic component shown in Fig. 2 of Patent Document 1 has the following problems.

[0005] In the electronic component shown in Figure 2 of Patent Document 1, two or three coil conductors are connected in parallel, which is thought to increase the cross-sectional area of ​​the coil in the direction along the current path of the coil, i.e., perpendicular to the direction in which the coil conductor extends. Therefore, in the electronic component shown in Figure 2 of Patent Document 1, the direct current resistance (Rdc) of the coil is low, which is thought to enable a large current to flow through the coil.

[0006] However, in the electronic component shown in Fig. 2 of Patent Document 1, when a large current is passed through the coil, a large current also flows through the lead conductor, which may cause heat generation and electromigration to occur easily in the lead conductor. In the electronic component shown in Fig. 2 of Patent Document 1, the coil and the external electrode are electrically connected through one lead conductor, so if the lead conductor is broken due to heat generation and electromigration, the electronic component will no longer function.

[0007] The present invention has been made to solve the above problems, and has an object to provide a multilayer coil component in which heat generation and electromigration in the lead conductors are suppressed. [Means for solving the problem]

[0008] The laminated coil component of the present invention comprises an element body formed by stacking a plurality of insulating layers in a stacking direction, a coil provided inside the element body, and an external electrode provided on a surface of the element body and electrically connected to the coil, wherein the coil is formed by stacking a plurality of coil conductors in the stacking direction and electrically connected to each other via via conductors that penetrate the insulating layers in the stacking direction, the plurality of coil conductors stacked in the stacking direction include a first laminate section consisting of a plurality of adjacent coil conductors including an outermost coil conductor located at the outermost position in the stacking direction, the first laminate section has a first parallel running section in which all of the coil conductors constituting the first laminate section overlap when viewed from the stacking direction, the first parallel running section is connected in parallel by the via conductors, and the outermost coil conductor is electrically connected to the same external electrode at one end of the first parallel running section via a first lead conductor and at the other end of the first parallel running section via a second lead conductor. Effect of the Invention

[0009] According to the present invention, it is possible to provide a multilayer coil component in which heat generation and electromigration in the lead conductors are suppressed. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic perspective view showing an example of a multilayer coil component according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic perspective view showing an example of an exploded state of the multilayer coil component shown in FIG. 1 (excluding external electrodes). [Diagram 3] FIG. 3 is a schematic plan view showing an example of an exploded state of the multilayer coil component shown in FIG. 1 (excluding the external electrodes). [Figure 4] FIG. 4 is an enlarged schematic cross-sectional view showing an example of a cross-section of the vicinity of a first end surface of the element body in the multilayer coil component shown in FIG. 1, as viewed from the height direction. [Diagram 5]FIG. 5 is an enlarged schematic cross-sectional view showing an example of a cross-section of the vicinity of a second end surface of the element body in the multilayer coil component shown in FIG. 1, viewed from the height direction. [Figure 6] FIG. 6 is a schematic perspective view showing an example of an exploded state of the multilayer coil component (excluding the external electrodes) according to the second embodiment of the present invention. [Figure 7] FIG. 7 is a schematic plan view showing an example of an exploded state of the multilayer coil component shown in FIG. 6 (excluding the external electrodes). [Figure 8] FIG. 8 is a schematic perspective view showing an example of an exploded state of the multilayer coil component (excluding the external electrodes) according to the third embodiment of the present invention. [Figure 9] FIG. 9 is a schematic plan view showing an example of an exploded state of the multilayer coil component shown in FIG. 8 (excluding the external electrodes). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The laminated coil 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 multilayer coil 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] The laminated coil component of the present invention comprises an element body formed by stacking a plurality of insulating layers in a stacking direction, a coil provided inside the element body, and an external electrode provided on a surface of the element body and electrically connected to the coil, wherein the coil is formed by stacking a plurality of coil conductors in the stacking direction and electrically connected to each other via via conductors that penetrate the insulating layers in the stacking direction, the plurality of coil conductors stacked in the stacking direction include a first laminate section consisting of a plurality of adjacent coil conductors including an outermost coil conductor located at the outermost position in the stacking direction, the first laminate section has a first parallel running section in which all of the coil conductors constituting the first laminate section overlap when viewed from the stacking direction, the first parallel running section is connected in parallel by the via conductors, and the outermost coil conductor is electrically connected to the same external electrode at one end of the first parallel running section via a first lead conductor and at the other end of the first parallel running section via a second lead conductor.

[0016] [Embodiment 1] An example of the laminated coil component of the present invention will be described as a laminated coil component of embodiment 1 of the present invention.

[0017] FIG. 1 is a schematic perspective view showing an example of a multilayer coil component according to a first embodiment of the present invention.

[0018] The multilayer coil component 1 shown in Fig. 1 has an element body 10A, a first external electrode 21, and a second external electrode 22. Although not shown in Fig. 1, as will be described later, the multilayer coil component 1 also has a coil provided inside the element body 10A.

[0019] 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.

[0020] The element body 10A has a first end face 11a and a second end face 11b facing each other in the longitudinal direction L, a first main face 12a and a second main face 12b facing each other in the height direction T, and a first side face 13a and a second side face 13b facing each other in the width direction W, and is, for example, rectangular or approximately rectangular.

[0021] The first end face 11a and the second end face 11b of the element body 10A do not need to be strictly perpendicular to the length direction L. In addition, the first main surface 12a and the second main surface 12b of the element body 10A do not need to be strictly perpendicular to the height direction T. Furthermore, the first side surface 13a and the second side surface 13b of the element body 10A do not need to be strictly perpendicular to the width direction W.

[0022] When the multilayer coil component 1 is mounted on a substrate, the first main surface 12a of the element body 10A serves as the mounting surface.

[0023] It is preferable that the corners and ridges of element body 10A are rounded. The corners of element body 10A are parts where three faces of element body 10A intersect. The ridges of element body 10A are parts where two faces of element body 10A intersect.

[0024] The first external electrode 21 is provided on the surface of the element body 10A. More specifically, the first external electrode 21 extends from the first end face 11a of the element body 10A across parts of the first main surface 12a, the second main surface 12b, the first side surface 13a, and the second side surface 13b.

[0025] The arrangement of the first external electrode 21 is not limited to the arrangement shown in Fig. 1. For example, the first external electrode 21 may extend from a part of the first main surface 12a of the element body 10A to a part of each of the first end surface 11a, the first side surface 13a, and the second side surface 13b.

[0026] The second external electrode 22 is provided on the surface of the element body 10A. More specifically, the second external electrode 22 extends from the second end face 11b of the element body 10A over a portion of each of the first main surface 12a, the second main surface 12b, the first side surface 13a, and the second side surface 13b.

[0027] The arrangement of the second external electrode 22 is not limited to the arrangement shown in Fig. 1. For example, the second external electrode 22 may extend from a part of the first main surface 12a of the element body 10A to a part of each of the second end surface 11b, the first side surface 13a, and the second side surface 13b.

[0028] As described above, the first external electrode 21 and the second external electrode 22 are provided at positions spaced apart from each other on the surface of the element body 10A.

[0029] As described above, by providing the first external electrode 21 and the second external electrode 22 on the first main surface 12a of the element body 10A, which is the mounting surface, the mountability of the multilayer coil component 1 is improved.

[0030] The first external electrode 21 and the second external electrode 22 may each have a single-layer structure or a multi-layer structure.

[0031] When the first external electrode 21 and the second external electrode 22 each have a single-layer structure, examples of the constituent material of each external electrode include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0032] When the first external electrode 21 and the second external electrode 22 each have a multi-layer structure, each external electrode may have, in order from the surface side of the base body 10A, for example, a base electrode containing Ag, a Ni-plated electrode, and a Sn-plated electrode.

[0033] Fig. 2 is a schematic perspective view showing an example of an exploded state of the multilayer coil component (excluding external electrodes) shown in Fig. 1. Fig. 3 is a schematic plan view showing an example of an exploded state of the multilayer coil component (excluding external electrodes) shown in Fig. 1.

[0034] As shown in FIGS. 2 and 3, the element body 10A is formed by laminating a plurality of insulating layers in a lamination direction, which is the length direction L here.

[0035] The base body 10A includes insulating layer P1, insulating layer P2, insulating layer P3, insulating layer P4, insulating layer P5, insulating layer P6, insulating layer P7, insulating layer P8, insulating layer P9, insulating layer P10, insulating layer P11, insulating layer P12, insulating layer P13, and insulating layer P14, which are arranged in order in the longitudinal direction L from the first end face 11a side to the second end face 11b side.

[0036] The constituent material of each insulating layer may be, for example, a magnetic material such as a ferrite material.

[0037] The ferrite material is preferably a Ni-Cu-Zn based ferrite material.

[0038] When the total amount of the Ni-Cu-Zn ferrite material is taken as 100 mol%, it is preferable that the material contains Fe of 40 mol% or more and 49.5 mol% or less, calculated as Fe2O3, Zn of 2 mol% or more and 35 mol% or less, calculated as ZnO, Cu of 6 mol% or more and 13 mol% or less, calculated as CuO, and Ni of 10 mol% or more and 45 mol% or less, calculated as NiO.

[0039] The Ni-Cu-Zn based ferrite material may further contain additives such as Co, Bi, Sn, and Mn.

[0040] The Ni-Cu-Zn based ferrite material may further contain inevitable impurities.

[0041] A coil 30A is provided inside the element body 10A.

[0042] As shown in Figures 2 and 3, coil 30A includes, in order in the longitudinal direction L, coil conductor Q1, coil conductor Q2, coil conductor Q3, coil conductor Q4, coil conductor Q5, coil conductor Q6, coil conductor Q7, coil conductor Q8, coil conductor Q9, coil conductor Q10, coil conductor Q11, coil conductor Q12, coil conductor Q13, and coil conductor Q14.

[0043] The coil conductor Q1 is U-shaped and is provided on the main surface of the insulating layer P1.

[0044] Coil conductor Q1 has land portion Rb1 and land portion Rc1 at separate ends.

[0045] The coil conductor Q1 has a bent portion Ua1 and a bent portion Ud1.

[0046] The coil conductor Q2 is U-shaped and is provided on the main surface of the insulating layer P2.

[0047] Coil conductor Q2 has land portion Rc2 and land portion Rd2 at separate ends.

[0048] The coil conductor Q2 has a bent portion Ua2 and a bent portion Ub2.

[0049] The bent portion Ua2 is connected to a via conductor Sa2 that penetrates the insulating layer P2 in the length direction L. The via conductor Sa2 is connected to the bent portion Ua1 in addition to the bent portion Ua2. That is, the bent portion Ua1 and the bent portion Ua2 are electrically connected through the via conductor Sa2.

[0050] The bent portion Ub2 is connected to a via conductor Sb2 that penetrates the insulating layer P2 in the length direction L. The via conductor Sb2 is connected to the land portion Rb1 in addition to the bent portion Ub2. That is, the land portion Rb1 and the bent portion Ub2 are electrically connected through the via conductor Sb2.

[0051] The coil conductor Q3 is U-shaped and is provided on the main surface of the insulating layer P3.

[0052] Coil conductor Q3 has land portions Ra3 and Rd3 at separate ends.

[0053] The land portion Ra3 is connected to a via conductor Sa3 that penetrates the insulating layer P3 in the length direction L. The via conductor Sa3 is connected to the bent portion Ua2 in addition to the land portion Ra3. That is, the bent portion Ua2 and the land portion Ra3 are electrically connected through the via conductor Sa3.

[0054] The coil conductor Q3 has a bent portion Ub3 and a bent portion Uc3.

[0055] The bend Ub3 is connected to a via conductor Sb3 that penetrates the insulating layer P3 in the length direction L. The via conductor Sb3 is connected to the bend Ub2 in addition to the bend Ub3. That is, the bend Ub2 and the bend Ub3 are electrically connected through the via conductor Sb3.

[0056] The bent portion Uc3 is connected to a via conductor Sc3 that penetrates the insulating layer P3 in the length direction L. The via conductor Sc3 is connected to the land portion Rc2 in addition to the bent portion Uc3. That is, the land portion Rc2 and the bent portion Uc3 are electrically connected through the via conductor Sc3.

[0057] The coil conductor Q4 is U-shaped and is provided on the main surface of the insulating layer P4.

[0058] Coil conductor Q4 has land portion Ra4 and land portion Rb4 at separate ends.

[0059] The land portion Rb4 is connected to a via conductor Sb4 that penetrates the insulating layer P4 in the length direction L. The via conductor Sb4 is connected to the bend portion Ub3 in addition to the land portion Rb4. That is, the bend portion Ub3 and the land portion Rb4 are electrically connected through the via conductor Sb4.

[0060] The coil conductor Q4 has a bent portion Uc4 and a bent portion Ud4.

[0061] The bent portion Uc4 is connected to a via conductor Sc4 that penetrates the insulating layer P4 in the longitudinal direction L. The via conductor Sc4 is connected to the bent portion Uc3 in addition to the bent portion Uc4. That is, the bent portion Uc3 and the bent portion Uc4 are electrically connected through the via conductor Sc4.

[0062] The bent portion Ud4 is connected to a via conductor Sd4 that penetrates the insulating layer P4 in the length direction L. The via conductor Sd4 is connected to the land portion Rd3 in addition to the bent portion Ud4. That is, the land portion Rd3 and the bent portion Ud4 are electrically connected through the via conductor Sd4.

[0063] The coil conductor Q5 is U-shaped and is provided on the main surface of the insulating layer P5.

[0064] Coil conductor Q5 has land portion Rb5 and land portion Rc5 at separate ends.

[0065] The land portion Rc5 is connected to a via conductor Sc5 that penetrates the insulating layer P5 in the length direction L. The via conductor Sc5 is connected to the bent portion Uc4 in addition to the land portion Rc5. That is, the bent portion Uc4 and the land portion Rc5 are electrically connected through the via conductor Sc5.

[0066] The coil conductor Q5 has a bent portion Ua5 and a bent portion Ud5.

[0067] The bent portion Ua5 is connected to a via conductor Sa5 that penetrates the insulating layer P5 in the length direction L. The via conductor Sa5 is connected to the land portion Ra4 in addition to the bent portion Ua5. That is, the land portion Ra4 and the bent portion Ua5 are electrically connected through the via conductor Sa5.

[0068] The bent portion Ud5 is connected to a via conductor Sd5 that penetrates the insulating layer P5 in the length direction L. The via conductor Sd5 is connected to the bent portion Ud4 in addition to the bent portion Ud5. That is, the bent portion Ud4 and the bent portion Ud5 are electrically connected through the via conductor Sd5.

[0069] The coil conductor Q6 is U-shaped and is provided on the main surface of the insulating layer P6.

[0070] Coil conductor Q6 has land portion Rc6 and land portion Rd6 at separate ends.

[0071] The land portion Rd6 is connected to a via conductor Sd6 that penetrates the insulating layer P6 in the length direction L. The via conductor Sd6 is connected to the bent portion Ud5 in addition to the land portion Rd6. That is, the bent portion Ud5 and the land portion Rd6 are electrically connected through the via conductor Sd6.

[0072] The coil conductor Q6 has a bent portion Ua6 and a bent portion Ub6.

[0073] The bent portion Ua6 is connected to a via conductor Sa6 that penetrates the insulating layer P6 in the length direction L. The via conductor Sa6 is connected to the bent portion Ua5 in addition to the bent portion Ua6. That is, the bent portion Ua5 and the bent portion Ua6 are electrically connected through the via conductor Sa6.

[0074] The bend Ub6 is connected to a via conductor Sb6 that penetrates the insulating layer P6 in the length direction L. The via conductor Sb6 is connected to the land portion Rb5 in addition to the bend Ub6. That is, the land portion Rb5 and the bend Ub6 are electrically connected through the via conductor Sb6.

[0075] The coil conductor Q7 is U-shaped and is provided on the main surface of the insulating layer P7.

[0076] Coil conductor Q7 has land portion Ra7 and land portion Rd7 at separate ends.

[0077] The land portion Ra7 is connected to a via conductor Sa7 that penetrates the insulating layer P7 in the length direction L. The via conductor Sa7 is connected to the bent portion Ua6 in addition to the land portion Ra7. That is, the bent portion Ua6 and the land portion Ra7 are electrically connected through the via conductor Sa7.

[0078] The coil conductor Q7 has a bend Ub7 and a bend Uc7.

[0079] The bend Ub7 is connected to a via conductor Sb7 that penetrates the insulating layer P7 in the length direction L. The via conductor Sb7 is connected to the bend Ub6 in addition to the bend Ub7. That is, the bend Ub6 and the bend Ub7 are electrically connected through the via conductor Sb7.

[0080] The bent portion Uc7 is connected to a via conductor Sc7 that penetrates the insulating layer P7 in the length direction L. The via conductor Sc7 is connected to the land portion Rc6 in addition to the bent portion Uc7. That is, the land portion Rc6 and the bent portion Uc7 are electrically connected through the via conductor Sc7.

[0081] The coil conductor Q8 is U-shaped and is provided on the main surface of the insulating layer P8.

[0082] Coil conductor Q8 has land portion Ra8 and land portion Rb8 at separate ends.

[0083] The land portion Rb8 is connected to a via conductor Sb8 that penetrates the insulating layer P8 in the length direction L. The via conductor Sb8 is connected to the bend portion Ub7 in addition to the land portion Rb8. That is, the bend portion Ub7 and the land portion Rb8 are electrically connected through the via conductor Sb8.

[0084] The coil conductor Q8 has a bent portion Uc8 and a bent portion Ud8.

[0085] The bent portion Uc8 is connected to a via conductor Sc8 that penetrates the insulating layer P8 in the longitudinal direction L. The via conductor Sc8 is connected to the bent portion Uc7 in addition to the bent portion Uc8. That is, the bent portion Uc7 and the bent portion Uc8 are electrically connected to each other through the via conductor Sc8.

[0086] The bent portion Ud8 is connected to a via conductor Sd8 that penetrates the insulating layer P8 in the length direction L. The via conductor Sd8 is connected to the land portion Rd7 in addition to the bent portion Ud8. That is, the land portion Rd7 and the bent portion Ud8 are electrically connected through the via conductor Sd8.

[0087] The coil conductor Q9 is U-shaped and is provided on the main surface of the insulating layer P9.

[0088] Coil conductor Q9 has land portion Rb9 and land portion Rc9 at separate ends.

[0089] The land portion Rb9 is connected to a via conductor Sb9 that penetrates the insulating layer P9 in the length direction L. The via conductor Sb9 is connected to the land portion Rb8 in addition to the land portion Rb9. That is, the land portion Rb8 and the land portion Rb9 are electrically connected to each other through the via conductor Sb9.

[0090] The coil conductor Q9 has a bent portion Ua9 and a bent portion Ud9.

[0091] The bent portion Ua9 is connected to a via conductor Sa9 that penetrates the insulating layer P9 in the length direction L. The via conductor Sa9 is connected to the land portion Ra8 in addition to the bent portion Ua9. That is, the land portion Ra8 and the bent portion Ua9 are electrically connected to each other through the via conductor Sa9.

[0092] The bent portion Ud9 is connected to a via conductor Sd9 that penetrates the insulating layer P9 in the length direction L. The via conductor Sd9 is connected to the bent portion Ud8 in addition to the bent portion Ud9. That is, the bent portion Ud8 and the bent portion Ud9 are electrically connected to each other through the via conductor Sd9.

[0093] The coil conductor Q10 is U-shaped and is provided on the main surface of the insulating layer P10.

[0094] Coil conductor Q10 has land portion Rc10 and land portion Rd10 at separate ends.

[0095] The land portion Rd10 is connected to a via conductor Sd10 that penetrates the insulating layer P10 in the length direction L. The via conductor Sd10 is connected to the bent portion Ud9 in addition to the land portion Rd10. That is, the bent portion Ud9 and the land portion Rd10 are electrically connected through the via conductor Sd10.

[0096] The coil conductor Q10 has a bent portion Ua10 and a bent portion Ub10.

[0097] The bent portion Ua10 is connected to a via conductor Sa10 that penetrates the insulating layer P10 in the length direction L. The via conductor Sa10 is connected to the bent portion Ua9 in addition to the bent portion Ua10. That is, the bent portion Ua9 and the bent portion Ua10 are electrically connected through the via conductor Sa10.

[0098] The bend Ub10 is connected to a via conductor Sb10 that penetrates the insulating layer P10 in the length direction L. The via conductor Sb10 is connected to the land portion Rb9 in addition to the bend Ub10. That is, the land portion Rb9 and the bend Ub10 are electrically connected through the via conductor Sb10.

[0099] The coil conductor Q11 is U-shaped and is provided on the main surface of the insulating layer P11.

[0100] Coil conductor Q11 has land portions Ra11 and Rd11 at separate ends.

[0101] The land portion Ra11 is connected to a via conductor Sa11 that penetrates the insulating layer P11 in the length direction L. The via conductor Sa11 is connected to the bent portion Ua10 in addition to the land portion Ra11. That is, the bent portion Ua10 and the land portion Ra11 are electrically connected through the via conductor Sa11.

[0102] The coil conductor Q11 has a bent portion Ub11 and a bent portion Uc11.

[0103] The bend Ub11 is connected to a via conductor Sb11 that penetrates the insulating layer P11 in the length direction L. The via conductor Sb11 is connected to the bend Ub10 in addition to the bend Ub11. That is, the bend Ub10 and the bend Ub11 are electrically connected through the via conductor Sb11.

[0104] The bent portion Uc11 is connected to a via conductor Sc11 that penetrates the insulating layer P11 in the length direction L. The via conductor Sc11 is connected to the land portion Rc10 in addition to the bent portion Uc11. That is, the land portion Rc10 and the bent portion Uc11 are electrically connected through the via conductor Sc11.

[0105] The coil conductor Q12 is U-shaped and is provided on the main surface of the insulating layer P12.

[0106] Coil conductor Q12 has land portion Ra12 and land portion Rb12 at separate ends.

[0107] The land portion Rb12 is connected to a via conductor Sb12 that penetrates the insulating layer P12 in the length direction L. The via conductor Sb12 is connected to the bend portion Ub11 in addition to the land portion Rb12. That is, the bend portion Ub11 and the land portion Rb12 are electrically connected through the via conductor Sb12.

[0108] The coil conductor Q12 has a bent portion Uc12 and a bent portion Ud12.

[0109] The bent portion Uc12 is connected to a via conductor Sc12 that penetrates the insulating layer P12 in the length direction L. The via conductor Sc12 is connected to the bent portion Uc11 in addition to the bent portion Uc12. That is, the bent portion Uc11 and the bent portion Uc12 are electrically connected through the via conductor Sc12.

[0110] The bent portion Ud12 is connected to a via conductor Sd12 that penetrates the insulating layer P12 in the length direction L. The via conductor Sd12 is connected to the land portion Rd11 in addition to the bent portion Ud12. That is, the land portion Rd11 and the bent portion Ud12 are electrically connected through the via conductor Sd12.

[0111] The coil conductor Q13 is U-shaped and is provided on the main surface of the insulating layer P13.

[0112] Coil conductor Q13 has land portion Rb13 and land portion Rc13 at separate ends.

[0113] The land portion Rc13 is connected to a via conductor Sc13 that penetrates the insulating layer P13 in the length direction L. The via conductor Sc13 is connected to the bent portion Uc12 in addition to the land portion Rc13. That is, the bent portion Uc12 and the land portion Rc13 are electrically connected through the via conductor Sc13.

[0114] The coil conductor Q13 has a bent portion Ua13 and a bent portion Ud13.

[0115] The bent portion Ua13 is connected to a via conductor Sa13 that penetrates the insulating layer P13 in the length direction L. The via conductor Sa13 is connected to the land portion Ra12 in addition to the bent portion Ua13. That is, the land portion Ra12 and the bent portion Ua13 are electrically connected through the via conductor Sa13.

[0116] The bent portion Ud13 is connected to a via conductor Sd13 that penetrates the insulating layer P13 in the length direction L. The via conductor Sd13 is connected to the bent portion Ud12 in addition to the bent portion Ud13. That is, the bent portion Ud12 and the bent portion Ud13 are electrically connected through the via conductor Sd13.

[0117] The coil conductor Q14 is U-shaped and is provided on the main surface of the insulating layer P14.

[0118] Coil conductor Q14 has land portion Rc14 and land portion Rd14 at separate ends.

[0119] The land portion Rd14 is connected to a via conductor Sd14 that penetrates the insulating layer P14 in the length direction L. The via conductor Sd14 is connected to the bent portion Ud13 in addition to the land portion Rd14. That is, the bent portion Ud13 and the land portion Rd14 are electrically connected through the via conductor Sd14.

[0120] The coil conductor Q14 has a bent portion Ua14 and a bent portion Ub14.

[0121] The bent portion Ua14 is connected to a via conductor Sa14 that penetrates the insulating layer P14 in the length direction L. The via conductor Sa14 is connected to the bent portion Ua13 in addition to the bent portion Ua14. That is, the bent portion Ua13 and the bent portion Ua14 are electrically connected through the via conductor Sa14.

[0122] The bent portion Ub14 is connected to a via conductor Sb14 that penetrates the insulating layer P14 in the length direction L. The via conductor Sb14 is connected to the land portion Rb13 in addition to the bent portion Ub14. That is, the land portion Rb13 and the bent portion Ub14 are electrically connected through the via conductor Sb14.

[0123] In this specification, the U-shape may be a shape in which two adjacent sides of the three sides are approximately perpendicular to each other, but it is not necessary for the two adjacent sides of the three sides to be strictly perpendicular to each other.

[0124] In the multilayer coil component 1, as described above, the insulating layer P1, the insulating layer P2, the insulating layer P3, the insulating layer P4, the insulating layer P5, the insulating layer P6, the insulating layer P7, the insulating layer P8, the insulating layer P9, the insulating layer P10, the insulating layer P11, the insulating layer P12, the insulating layer P13, and the insulating layer P14 are laminated in this order in the longitudinal direction L. As a result, the coil conductor Q1, the coil conductor Q2, the coil conductor Q3, the coil conductor Q4, the coil conductor Q5, the coil conductor Q6, the coil conductor Q7, the coil conductor Q8, the coil conductor Q9, the coil conductor Q10, the coil conductor Q11, the coil conductor Q12, the coil conductor Q13, and the coil conductor Q14 are laminated in this order in the longitudinal direction L together with the insulating layers and are electrically connected via the via conductors described above, resulting in the configuration of the coil 30A.

[0125] The coil 30A is, for example, in the form of a solenoid.

[0126] When viewed from the longitudinal direction L, the coil 30A may have a shape composed of straight portions (e.g., a polygonal shape) as shown in Figures 2 and 3, a shape composed of curved portions (e.g., a circular shape), or a shape composed of straight portions and curved portions.

[0127] In the laminated coil component of the present invention, it is preferable that the laminated direction and the direction of the coil axis of the coil are parallel to the mounting surface of the element body along the same direction.

[0128] In element body 10A, the lamination direction of the insulating layers is parallel to length direction L. In other words, the lamination direction of the insulating layers is parallel to first main surface 12a of element body 10A, which is the mounting surface.

[0129] The coil 30A has a coil axis C. The coil axis C of the coil 30A corresponds to the central axis of the coil 30A when viewed from the longitudinal direction L, and extends in the longitudinal direction L. In other words, the direction of the coil axis C of the coil 30A is parallel to the first main surface 12a of the element body 10A, which is the mounting surface.

[0130] Therefore, in the laminated coil component 1, the lamination direction of the insulating layers and the direction of the coil axis C of the coil 30A are along the same length direction L and are parallel to the first main surface 12a of the element body 10A, which is the mounting surface.

[0131] In the multilayer coil component 1, the stacking direction of the insulating layers and the direction of the coil axis C of the coil 30A are shown to be along the same length direction L and parallel to the first main surface 12a of the base body 10A, which is the mounting surface. However, the stacking direction of the insulating layers and the direction of the coil axis of the coil may be perpendicular to the first main surface of the base body, which is the mounting surface.

[0132] In the multilayer coil component 1, the multiple coil conductors stacked in the length direction L include a first multilayer portion Ea1.

[0133] The first laminated portion Ea1 is composed of three adjacent coil conductors, namely, coil conductor Q1, coil conductor Q2, and coil conductor Q3. The coil conductor Q1 corresponds to the outermost coil conductor located at the outermost position in the longitudinal direction L among the multiple coil conductors laminated in the longitudinal direction L.

[0134] The first laminated portion Ea1 has a first parallel running section Ma1 in which all of the coil conductors constituting the first laminated portion Ea1, i.e., the coil conductor Q1, the coil conductor Q2, and the coil conductor Q3, overlap when viewed from the longitudinal direction L.

[0135] In the first parallel section Ma1, the via conductor Sa2, the via conductor Sb2, the via conductor Sa3, and the via conductor Sb3 are connected in parallel, that is, the coil conductor Q1, the coil conductor Q2, and the coil conductor Q3 are connected in parallel in the first parallel section Ma1.

[0136] The coil conductor Q1, the coil conductor Q2, and the coil conductor Q3 do not overlap each other when viewed from the longitudinal direction L, except in the first parallel running section Ma1.

[0137] In the multilayer coil component of the present invention, the length of all of the coil conductors constituting the first multilayer section may be a length of 3 / 4 turns of the coil.

[0138] In the multilayer coil component 1, for example, the length of all the coil conductors constituting the first multilayer unit Ea1, ie, the coil conductor Q1, the coil conductor Q2, and the coil conductor Q3, is 3 / 4 of the length of the turn of the coil 30A.

[0139] In this specification, the length of the coil conductor means the length in the direction in which the coil conductor extends on a plane perpendicular to the stacking direction (length direction L in Figures 2 and 3) when viewed from the stacking direction.

[0140] In the multilayer coil component of the present invention, it is preferable that the multiple coil conductors stacked in the stacking direction further include a second stacking section consisting of the same number of adjacent coil conductors as the first stacking section, and it is preferable that the second stacking section has a second parallel running section in which all of the coil conductors constituting the second stacking section overlap when viewed from the stacking direction, it is preferable that the second parallel running section is connected in parallel by the via conductors, and it is preferable that the first parallel running section and the second parallel running section overlap when viewed from the stacking direction.

[0141] In the multilayer coil component 1, the multiple coil conductors laminated in the length direction L further include a second multilayer portion Fa1 in addition to the first multilayer portion Ea1.

[0142] The second laminate unit Fa1 is made up of three adjacent coil conductors Q5, Q6, and Q7, the same number as the first laminate unit Ea1.

[0143] The second laminate portion Fa1 has a second parallel running section Na1 in which all of the coil conductors constituting the second laminate portion Fa1, i.e., the coil conductor Q5, the coil conductor Q6, and the coil conductor Q7, overlap when viewed from the longitudinal direction L.

[0144] The second parallel section Na1 is connected in parallel by the via conductor Sa6, the via conductor Sb6, the via conductor Sa7, and the via conductor Sb7. That is, the coil conductor Q5, the coil conductor Q6, and the coil conductor Q7 are connected in parallel in the second parallel section Na1.

[0145] The coil conductor Q5, the coil conductor Q6, and the coil conductor Q7 do not overlap each other when viewed from the longitudinal direction L, except in the second parallel running section Na1.

[0146] The first parallel running section Ma1 and the second parallel running section Na1 overlap each other when viewed from the longitudinal direction L.

[0147] In the multilayer coil component of the present invention, the length of all of the coil conductors constituting the second multilayer section may be a length of 3 / 4 turns of the coil.

[0148] In the multilayer coil component 1, for example, the length of all the coil conductors constituting the second multilayer section Fa1, ie, the coil conductor Q5, the coil conductor Q6, and the coil conductor Q7, is 3 / 4 of the length of the turn of the coil 30A.

[0149] In the above, an example has been given of the first laminate portion including a coil conductor Q1 that corresponds to the outermost coil conductor located on the first end face 11a side of the base body 10A, but the first laminate portion may also include a coil conductor Q14 that corresponds to the outermost coil conductor located on the second end face 11b side of the base body 10A.

[0150] In the multilayer coil component 1, the multiple coil conductors stacked in the length direction L include a first multilayer portion Eb1.

[0151] The first laminated portion Eb1 is composed of three adjacent coil conductors, namely, coil conductor Q12, coil conductor Q13, and coil conductor Q14. Like the coil conductor Q1, the coil conductor Q14 corresponds to the outermost coil conductor located at the outermost position in the longitudinal direction L among the multiple coil conductors laminated in the longitudinal direction L.

[0152] The first laminate unit Eb1 has a first parallel running section Mb1 in which all of the coil conductors that make up the first laminate unit Eb1, i.e., the coil conductor Q12, the coil conductor Q13, and the coil conductor Q14, overlap when viewed from the longitudinal direction L.

[0153] The first parallel running section Mb1 is connected in parallel by the via conductor Sa13, the via conductor Sd13, the via conductor Sa14, and the via conductor Sd14. That is, the coil conductor Q12, the coil conductor Q13, and the coil conductor Q14 are connected in parallel in the first parallel running section Mb1.

[0154] The coil conductor Q12, the coil conductor Q13, and the coil conductor Q14 do not overlap each other when viewed from the longitudinal direction L, except in the first parallel running section Mb1.

[0155] The length of all the coil conductors constituting the first laminated unit Eb1, that is, the coil conductor Q12, the coil conductor Q13, and the coil conductor Q14, is equal to 3 / 4 of the length of the coil 30A.

[0156] In the multilayer coil component 1, the multiple coil conductors laminated in the length direction L further include a second multilayer portion Fb1 in addition to the first multilayer portion Eb1.

[0157] The second multilayer unit Fb1 is made up of three adjacent coil conductors Q8, Q9, and Q10, which is the same number as the first multilayer unit Eb1.

[0158] The second laminated portion Fb1 has a second parallel running section Nb1 in which all of the coil conductors constituting the second laminated portion Fb1, i.e., the coil conductor Q8, the coil conductor Q9, and the coil conductor Q10, overlap when viewed from the longitudinal direction L.

[0159] The second parallel running section Nb1 is connected in parallel by the via conductor Sa9, the via conductor Sd9, the via conductor Sa10, and the via conductor Sd10. That is, the coil conductor Q8, the coil conductor Q9, and the coil conductor Q10 are connected in parallel in the second parallel running section Nb1.

[0160] The coil conductor Q8, the coil conductor Q9, and the coil conductor Q10 do not overlap each other when viewed from the longitudinal direction L, except in the second parallel running section Nb1.

[0161] The first parallel running section Mb1 and the second parallel running section Nb1 overlap each other when viewed in the longitudinal direction L.

[0162] The length of all the coil conductors constituting the second laminated portion Fb1, that is, the coil conductor Q8, the coil conductor Q9, and the coil conductor Q10, is equal to 3 / 4 of the length of the coil 30A.

[0163] In the above, the first lamination portion Ea1, the first lamination portion Eb1, the second lamination portion Fa1, and the second lamination portion Fb1 have been exemplified as lamination portions consisting of three adjacent coil conductors in the multilayer coil component 1, but the same applies to lamination portions consisting of other combinations of three adjacent coil conductors. In other words, in the multilayer coil component 1, the three adjacent coil conductors are connected in parallel in parallel running sections where these coil conductors overlap when viewed from the longitudinal direction L.

[0164] In the multilayer coil component 1, three adjacent coil conductors are connected in parallel in the parallel running sections, and therefore the cross-sectional area of ​​the coil 30A in the direction along the current path of the coil 30A, i.e., perpendicular to the direction in which the coil conductor extends, increases accordingly. Therefore, in the multilayer coil component 1, the direct current resistance (Rdc) of the coil 30A is low, and it becomes possible to pass a large current through the coil 30A.

[0165] The element body 10A further includes an insulating layer Px.

[0166] The insulating layer Px is laminated on the first end face 11a side of the insulating layer P1, that is, on the side of the insulating layer P1 opposite to the insulating layer P2.

[0167] An extension land portion Rbx is provided on the main surface of the insulating layer Px. The extension land portion Rbx is connected to an extension via conductor Sbx penetrating the insulating layer Px in the length direction L. The extension land portion Rbx is also connected to an extension via conductor Sb1 penetrating the insulating layer P1 in the length direction L, in addition to the extension via conductor Sbx. This forms a first extension conductor 41a consisting of the extension land portion Rbx, the extension via conductor Sbx, and the extension via conductor Sb1.

[0168] The extraction via conductor Sb1 is connected to the land portion Rb1 as well as the extraction land portion Rbx. That is, the coil conductor Q1, which corresponds to the outermost coil conductor, is connected to the first extraction conductor 41a at the land portion Rb1 located at one end of the first parallel running section Ma1. In this manner, the first extraction conductor 41a is connected to the coil 30A.

[0169] FIG. 4 is an enlarged schematic cross-sectional view showing an example of a cross-section of the vicinity of a first end surface of the element body in the multilayer coil component shown in FIG. 1, as viewed from the height direction.

[0170] 4, the insulating layer Px is laminated on the side of the insulating layer P1 opposite the insulating layer P2, so that the first extension conductor 41a is exposed from the first end surface 11a of the element body 10A. The exposed portion of the first extension conductor 41a is connected to the first external electrode 21 provided on the first end surface 11a of the element body 10A.

[0171] Therefore, the coil 30A and the first external electrode 21 are electrically connected via the first extension conductor 41a. That is, the coil conductor Q1, which corresponds to the outermost coil conductor, is electrically connected to the first external electrode 21 via the first extension conductor 41a at the land portion Rb1 located at one end of the first parallel running section Ma1.

[0172] In FIG. 4, for the sake of convenience, the boundaries between the insulating layers are shown, but in reality, these boundaries do not appear clearly.

[0173] An extension land portion Rax is provided on the main surface of the insulating layer Px at a position separated from the extension land portion Rbx. The extension land portion Rax is connected to an extension via conductor Sax penetrating the insulating layer Px in the length direction L. The extension land portion Rax is connected to an extension via conductor Sa1 penetrating the insulating layer P1 in the length direction L in addition to the extension via conductor Sax. This forms a second extension conductor 42a consisting of the extension land portion Rax, the extension via conductor Sax, and the extension via conductor Sa1.

[0174] The extension via conductor Sa1 is connected to the bent portion Ua1 as well as to the extension land portion Rax. That is, the coil conductor Q1, which corresponds to the outermost coil conductor, is connected to the second extension conductor 42a at the bent portion Ua1 located at the other end of the first parallel running section Ma1. In this manner, the second extension conductor 42a is connected to the coil 30A.

[0175] Since the insulating layer Px is laminated on the side of the insulating layer P1 opposite the insulating layer P2, the second extension conductor 42a is exposed from the first end surface 11a of the element body 10A. The exposed portion of the second extension conductor 42a is connected to the first external electrode 21 provided on the first end surface 11a of the element body 10A. A cross-sectional view showing the connection between the second extension conductor 42a and the first external electrode 21 is similar to FIG. 4, which is a cross-sectional view showing the connection between the first extension conductor 41a and the first external electrode 21.

[0176] Therefore, the coil 30A and the first external electrode 21 are electrically connected via the second extension conductor 42a. In other words, the coil conductor Q1, which corresponds to the outermost coil conductor, is electrically connected to the first external electrode 21 via the second extension conductor 42a at the bend Ua1 located at the other end of the first parallel running section Ma1.

[0177] For the above reasons, the coil 30A is electrically connected via the first extension conductor 41a and the second extension conductor 42a to the same first external electrode 21. In other words, the coil conductor Q1, which corresponds to the outermost coil conductor, is electrically connected to the same first external electrode 21 via the first extension conductor 41a at the land portion Rb1 located at one end of the first parallel running section Ma1, and via the second extension conductor 42a at the bend portion Ua1 located at the other end of the first parallel running section Ma1.

[0178] In the multilayer coil component 1, the coil conductor Q1 corresponding to the outermost coil conductor is electrically connected to the same first external electrode 21 via the first extension conductor 41a at one end of the first parallel running section Ma1 and via the second extension conductor 42a at the other end of the first parallel running section Ma1. This allows the current path between the coil 30A and the first external electrode 21 to be two paths, the first extension conductor 41a and the second extension conductor 42a. Therefore, in the multilayer coil component 1, the current density per extension conductor can be reduced. Therefore, in the multilayer coil component 1, even if a large current flows between the coil 30A and the first external electrode 21, the generation of heat and electromigration in one extension conductor can be suppressed compared to the case where the coil 30A and the first external electrode 21 are electrically connected by only one extension conductor. If the coil 30A and the first external electrode 21 are electrically connected by only one extension conductor, the multilayer coil component may not function if the extension conductor is broken due to heat generation and electromigration. In contrast, in the multilayer coil component 1, heat generation and electromigration in one lead conductor can be suppressed, and therefore disconnection of the lead conductor can be suppressed, even when a large current flows between the coil 30A and the first external electrode 21. Furthermore, in the unlikely event that a disconnection occurs in one of the first lead conductor 41a and the second lead conductor 42a, the function of the multilayer coil component can be maintained by the other.

[0179] The number of insulating layers Px may be one or more.

[0180] When the insulating layers Px include a plurality of layers, the first extension conductor 41a is formed by alternately connecting a plurality of extension land portions Rbx and a plurality of extension via conductors Sbx, and further connecting an extension via conductor Sb1.

[0181] When the number of insulating layers Px is multiple, the second extension conductor 42a is formed by alternately connecting a plurality of extension land portions Rax and a plurality of extension via conductors Sax, and further connecting an extension via conductor Sa1.

[0182] The element body 10A further includes an insulating layer Py.

[0183] The insulating layer Py is laminated on the second end face 11b side of the insulating layer P14, that is, on the side of the insulating layer P14 opposite to the insulating layer P13.

[0184] An extension land portion Rdy is provided on the main surface of the insulating layer Py. The extension land portion Rdy is connected to an extension via conductor Sdy that penetrates the insulating layer Py in the length direction L. This forms a first extension conductor 41b consisting of the extension land portion Rdy and the extension via conductor Sdy.

[0185] The extension via conductor Sdy is connected to the extension land portion Rdy as well as the land portion Rd14. That is, the coil conductor Q14, which corresponds to the outermost coil conductor, is connected to the first extension conductor 41b at the land portion Rd14 located at one end of the first parallel running section Mb1. In this manner, the first extension conductor 41b is connected to the coil 30A.

[0186] FIG. 5 is an enlarged schematic cross-sectional view showing an example of a cross-section of the vicinity of a second end surface of the element body in the multilayer coil component shown in FIG. 1, viewed from the height direction.

[0187] 5, the insulating layer Py is laminated on the side of the insulating layer P14 opposite the insulating layer P13, so that the first extension conductor 41b is exposed from the second end face 11b of the element body 10A. The exposed portion of the first extension conductor 41b is connected to the second external electrode 22 provided on the second end face 11b of the element body 10A.

[0188] Therefore, the coil 30A and the second external electrode 22 are electrically connected via the first extension conductor 41b. That is, the coil conductor Q14, which corresponds to the outermost coil conductor, is electrically connected to the second external electrode 22 via the first extension conductor 41b at the land portion Rd14 located at one end of the first parallel running section Mb1.

[0189] In FIG. 5, for the sake of convenience, the boundaries between the insulating layers are shown, but in reality, these boundaries do not appear clearly.

[0190] An extension land portion Ray is provided on the main surface of the insulating layer Py at a position separated from the extension land portion Rdy. The extension land portion Ray is connected to an extension via conductor Say that penetrates the insulating layer Py in the length direction L. This forms a second extension conductor 42b consisting of the extension land portion Ray and the extension via conductor Say.

[0191] The extension via conductor Say is connected to the extension land portion Ray as well as to the bent portion Ua14. That is, the coil conductor Q14, which corresponds to the outermost coil conductor, is connected to the second extension conductor 42b at the bent portion Ua14 located at the other end of the first parallel running section Mb1. In this manner, the second extension conductor 42b is connected to the coil 30A.

[0192] Since the insulating layer Py is laminated on the side of the insulating layer P14 opposite the insulating layer P13, the second extension conductor 42b is exposed from the second end face 11b of the element body 10A. The exposed portion of the second extension conductor 42b is connected to the second external electrode 22 provided on the second end face 11b of the element body 10A. A cross-sectional view showing the connection between the second extension conductor 42b and the second external electrode 22 is similar to FIG. 5, which is a cross-sectional view showing the connection between the first extension conductor 41b and the second external electrode 22.

[0193] Therefore, the coil 30A and the second external electrode 22 are electrically connected via the second extension conductor 42b. That is, the coil conductor Q14, which corresponds to the outermost coil conductor, is electrically connected to the second external electrode 22 via the second extension conductor 42b at the bend Ua14 located at the other end of the first parallel running section Mb1.

[0194] For the above reasons, the coil 30A is electrically connected to the same second external electrode 22 via the first extension conductor 41b and the second extension conductor 42b. That is, the coil conductor Q14, which corresponds to the outermost coil conductor, is electrically connected to the same second external electrode 22 via the first extension conductor 41b at the land portion Rd14 located at one end of the first parallel running section Mb1, and via the second extension conductor 42b at the bend portion Ua14 located at the other end of the first parallel running section Mb1.

[0195] In the laminated coil component 1, the coil conductor Q14 corresponding to the outermost coil conductor is electrically connected to the same second external electrode 22 via the first extension conductor 41b at one end of the first parallel running section Mb1 and via the second extension conductor 42b at the other end of the first parallel running section Mb1, so that the current path between the coil 30A and the second external electrode 22 can be two paths, the first extension conductor 41b and the second extension conductor 42b. Therefore, in the laminated coil component 1, the current density per one extension conductor can be reduced. Therefore, in the laminated coil component 1, even if a large current flows between the coil 30A and the second external electrode 22, the generation of heat and the occurrence of electromigration in one extension conductor can be suppressed compared to the case where the coil 30A and the second external electrode 22 are electrically connected by only one extension conductor. If the coil 30A and the second external electrode 22 are electrically connected by only one lead conductor, the laminated coil component may cease to function if the lead conductor is broken due to heat generation and electromigration. In contrast, the laminated coil component 1 can prevent heat generation and electromigration from occurring in the single lead conductor even when a large current is passed between the coil 30A and the second external electrode 22, and therefore can prevent the lead conductor from breaking. Furthermore, in the unlikely event that a break occurs in one of the first lead conductor 41b and the second lead conductor 42b, the laminated coil component 1 can maintain its function by the other.

[0196] The number of insulating layers Py may be one or more.

[0197] When the number of insulating layers Py is multiple, the first extension conductor 41b is formed by alternately connecting a plurality of extension land portions Rdy and a plurality of extension via conductors Sdy.

[0198] When the number of insulating layers Py is multiple, the second extension conductor 42b is formed by alternately connecting a plurality of extension land portions Ray and a plurality of extension via conductors Say.

[0199] The number of insulating layers Px and the number of insulating layers Py may be the same as each other or may be different from each other.

[0200] Examples of materials for each coil conductor (including the land portion), each via conductor, and each lead-out via conductor include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0201] When viewed from the longitudinal direction L, each coil conductor may have a shape composed of straight lines as shown in Figures 2 and 3, a shape composed of curved lines, or a shape composed of straight lines and curved lines.

[0202] When viewed from the longitudinal direction L, each land portion may be circular or polygonal.

[0203] When viewed from the length direction L, each via conductor may be circular or polygonal.

[0204] When viewed from the length direction L, each of the extraction via conductors may be in a circular shape or a polygonal shape.

[0205] Each of the coil conductors and each of the lead conductors may not independently have a land portion.

[0206] In the multilayer coil component of the present invention, when viewed from the stacking direction, it is preferable that the overlapping region between the first draw conductor and the outermost coil conductor overlaps with the region where four adjacent coil conductors including the outermost coil conductor overlap with the via conductors, and it is preferable that the overlapping region between the second draw conductor and the outermost coil conductor overlaps with the region where three adjacent coil conductors including the outermost coil conductor overlap with the via conductors, when viewed from the stacking direction.

[0207] The coil conductor Q1, which corresponds to the outermost coil conductor, is connected to the first extension conductor 41a at the land portion Rb1. That is, the land portion Rb1 overlaps the first extension conductor 41a when viewed from the longitudinal direction L.

[0208] On the other hand, the four adjacent coil conductors including the coil conductor Q1, which is the outermost coil conductor, i.e., coil conductor Q1, coil conductor Q2, coil conductor Q3, and coil conductor Q4, are electrically connected via via conductors as follows.

[0209] The coil conductor Q1 and the coil conductor Q2 are electrically connected to each other through the via conductor Sb2 at the land portion Rb1 and the bent portion Ub2. That is, the land portion Rb1 and the bent portion Ub2 overlap each other through the via conductor Sb2 when viewed from the longitudinal direction L.

[0210] The coil conductor Q2 and the coil conductor Q3 are electrically connected to each other through the via conductor Sb3 at the bends Ub2 and Ub3. That is, the bends Ub2 and Ub3 overlap each other through the via conductor Sb3 when viewed from the longitudinal direction L.

[0211] The coil conductor Q3 and the coil conductor Q4 are electrically connected to each other at the bend Ub3 and the land Rb4 through the via conductor Sb4. That is, the bend Ub3 and the land Rb4 overlap each other through the via conductor Sb4 when viewed from the longitudinal direction L.

[0212] From the above, in the laminated coil component 1, the first extension conductor 41a, the land portion Rb1, the bent portion Ub2, the bent portion Ub3, and the land portion Rb4 overlap when viewed from the longitudinal direction L. In this way, in the laminated coil component 1, when viewed from the longitudinal direction L, the region where the first extension conductor 41a and the coil conductor Q1 corresponding to the outermost coil conductor overlap overlaps with the region where the four adjacent coil conductors Q1, Q2, Q3, and Q4 including the coil conductor Q1 corresponding to the outermost coil conductor overlap with each other via conductors Sb2, Sb3, and Sb4. This makes it possible to shorten the current path between the first extension conductor 41a and the region where the coil conductors Q1, Q2, Q3, and Q4 overlap with each other via conductors Sb2, Sb3, and Sb4, and therefore to reduce the DC resistance of the current path.

[0213] In the region where the coil conductor Q1, the coil conductor Q2, the coil conductor Q3, and the coil conductor Q4 overlap with each other through the via conductor Sb2, the via conductor Sb3, and the via conductor Sb4, the current density is likely to be higher than in the region where the coil conductor Q1, the coil conductor Q2, and the coil conductor Q3 overlap with each other through the via conductor Sa2 and the via conductor Sa3, which will be described later. Therefore, as described above, by lowering the DC resistance of the current path between the first extension conductor 41a and the region where the coil conductor Q1, the coil conductor Q2, the coil conductor Q3, and the coil conductor Q4 overlap with each other through the via conductor Sb2, the via conductor Sb3, and the via conductor Sb4, the current density in the first extension conductor 41a is prevented from increasing. Therefore, in the laminated coil component 1, the current path between the coil 30A and the first external electrode 21 is two paths, the first extension conductor 41a and the second extension conductor 42a, and this prevents the generation of heat and electromigration in the first extension conductor 41a. As a result, in the multilayer coil component 1, breakage of the first lead conductor 41a is suppressed.

[0214] The coil conductor Q1, which corresponds to the outermost coil conductor, is connected to the second extension conductor 42a at the bent portion Ua1. That is, the bent portion Ua1 overlaps the second extension conductor 42a when viewed from the longitudinal direction L.

[0215] On the other hand, three adjacent coil conductors including the coil conductor Q1 which is the outermost coil conductor, that is, the coil conductor Q1, the coil conductor Q2, and the coil conductor Q3, are electrically connected via via conductors as follows.

[0216] The coil conductor Q1 and the coil conductor Q2 are electrically connected to each other through the via conductor Sa2 at the bent portions Ua1 and Ua2. That is, the bent portions Ua1 and Ua2 overlap each other through the via conductor Sa2 when viewed from the longitudinal direction L.

[0217] The coil conductor Q2 and the coil conductor Q3 are electrically connected to each other at the bent portion Ua2 and the land portion Ra3 through the via conductor Sa3. That is, the bent portion Ua2 and the land portion Ra3 overlap each other through the via conductor Sa3 when viewed from the longitudinal direction L.

[0218] From the above, in the laminated coil component 1, the second extension conductor 42a, the bent portions Ua1 and Ua2, and the land portion Ra3 overlap when viewed from the longitudinal direction L. Thus, in the laminated coil component 1, when viewed from the longitudinal direction L, the region where the second extension conductor 42a and the coil conductor Q1 corresponding to the outermost coil conductor overlap overlaps with the region where three adjacent coil conductors Q1, Q2, and Q3 including the coil conductor Q1 corresponding to the outermost coil conductor overlap with each other via the via conductors Sa2 and Sa3. This makes it possible to shorten the current path between the region where the coil conductors Q1, Q2, and Q3 overlap with each other via the via conductors Sa2 and Sa3 and the second extension conductor 42a, and therefore to reduce the DC resistance of the current path.

[0219] Although the above describes an example in which the outermost coil conductor corresponds to the coil conductor Q1, the same applies to an example in which the outermost coil conductor corresponds to the coil conductor Q14.

[0220] The coil conductor Q14, which corresponds to the outermost coil conductor, is connected to the first extension conductor 41b at the land portion Rd14. That is, the land portion Rd14 overlaps with the first extension conductor 41b when viewed from the longitudinal direction L.

[0221] On the other hand, the four adjacent coil conductors including the outermost coil conductor Q14, namely, coil conductor Q11, coil conductor Q12, coil conductor Q13, and coil conductor Q14, are electrically connected via via conductors as follows.

[0222] The coil conductor Q11 and the coil conductor Q12 are electrically connected to each other through the via conductor Sd12 at the land portion Rd11 and the bent portion Ud12. That is, the land portion Rd11 and the bent portion Ud12 overlap with each other through the via conductor Sd12 when viewed from the longitudinal direction L.

[0223] The coil conductor Q12 and the coil conductor Q13 are electrically connected to each other through the via conductor Sd13 at the bends Ud12 and Ud13. That is, the bends Ud12 and Ud13 overlap each other through the via conductor Sd13 when viewed from the longitudinal direction L.

[0224] The coil conductor Q13 and the coil conductor Q14 are electrically connected to each other through the via conductor Sd14 at the bend Ud13 and the land Rd14. That is, the bend Ud13 and the land Rd14 overlap each other through the via conductor Sd14 when viewed from the longitudinal direction L.

[0225] For the above reasons, in the laminated coil component 1, the first extension conductor 41b, the land portion Rd14, the bent portion Ud13, the bent portion Ud12, and the land portion Rd11 overlap when viewed from the longitudinal direction L. Thus, in the laminated coil component 1, when viewed from the longitudinal direction L, the overlapping region of the first extension conductor 41b and the coil conductor Q14 corresponding to the outermost coil conductor overlaps with the overlapping region of the four adjacent coil conductors Q11, Q12, Q13, and Q14 including the coil conductor Q14 corresponding to the outermost coil conductor, with the via conductors Sd12, Sd13, and Sd14 interposed therebetween. This makes it possible to shorten the current path between the area where coil conductor Q11, coil conductor Q12, coil conductor Q13, and coil conductor Q14 overlap through via conductor Sd12, via conductor Sd13, and via conductor Sd14, and the first extraction conductor 41b, thereby reducing the DC resistance of the current path.

[0226] In a region where the coil conductor Q11, the coil conductor Q12, the coil conductor Q13, and the coil conductor Q14 overlap with each other through the via conductor Sd12, the via conductor Sd13, and the via conductor Sd14, the current density is likely to be higher than in a region where the coil conductor Q12, the coil conductor Q13, and the coil conductor Q14 overlap with each other through the via conductor Sa13 and the via conductor Sa14, which will be described later. Therefore, as described above, by reducing the DC resistance of the current path between the first extension conductor 41b and the region where the coil conductor Q11, the coil conductor Q12, the coil conductor Q13, and the coil conductor Q14 overlap with each other through the via conductor Sd12, the via conductor Sd13, and the via conductor Sd14, an increase in the current density in the first extension conductor 41b is suppressed. Therefore, in the multilayer coil component 1, the current path between the coil 30A and the second external electrode 22 is two paths, the first extension conductor 41b and the second extension conductor 42b, which suppresses heat generation and electromigration in the first extension conductor 41b. As a result, in the multilayer coil component 1, breakage of the first extension conductor 41b is suppressed.

[0227] The coil conductor Q14, which corresponds to the outermost coil conductor, is connected to the second extension conductor 42b at a bent portion Ua14. That is, the bent portion Ua14 overlaps with the second extension conductor 42b when viewed from the longitudinal direction L.

[0228] On the other hand, three adjacent coil conductors including the outermost coil conductor Q14, that is, coil conductor Q12, coil conductor Q13, and coil conductor Q14, are electrically connected via via conductors as follows.

[0229] The coil conductor Q12 and the coil conductor Q13 are electrically connected to each other through the via conductor Sa13 at the land portion Ra12 and the bent portion Ua13. That is, the land portion Ra12 and the bent portion Ua13 overlap each other through the via conductor Sa13 when viewed from the longitudinal direction L.

[0230] The coil conductor Q13 and the coil conductor Q14 are electrically connected to each other through the via conductor Sa14 at the bends Ua13 and Ua14. That is, the bends Ua13 and Ua14 overlap each other through the via conductor Sa14 when viewed from the longitudinal direction L.

[0231] From the above, in the laminated coil component 1, the second extension conductor 42b, the bent portion Ua14, the bent portion Ua13, and the land portion Ra12 overlap when viewed from the longitudinal direction L. Thus, in the laminated coil component 1, when viewed from the longitudinal direction L, the region where the second extension conductor 42b and the coil conductor Q14 corresponding to the outermost coil conductor overlap overlaps with the region where three adjacent coil conductors Q12, Q13, and Q14 including the coil conductor Q14 corresponding to the outermost coil conductor overlap with each other via conductors Sa13 and Sa14. This makes it possible to shorten the current path between the region where the coil conductors Q12, Q13, and Q14 overlap with each other via conductors Sa13 and Sa14 and the second extension conductor 42b, and therefore makes it possible to reduce the DC resistance of the current path.

[0232] The multilayer coil component 1 is manufactured, for example, by the following method.

[0233] <Magnetic material manufacturing process> First, Fe2O3, ZnO, CuO, and NiO are weighed out to have a predetermined ratio.

[0234] Next, these weighed materials, pure water, etc. are put into a ball mill together with PSZ media, mixed, and then pulverized. The mixing and pulverization time is, for example, 4 hours or more and 8 hours or less.

[0235] The resulting pulverized material is dried and then calcined at a temperature of, for example, 700° C. to 800° C. for, for example, 2 hours to 5 hours.

[0236] In this manner, a powdered magnetic material, more specifically, a powdered magnetic ferrite material, is produced.

[0237] The ferrite material is preferably a Ni-Cu-Zn based ferrite material.

[0238] When the total amount of the Ni-Cu-Zn ferrite material is taken as 100 mol%, it is preferable that the material contains Fe of 40 mol% or more and 49.5 mol% or less, calculated as Fe2O3, Zn of 2 mol% or more and 35 mol% or less, calculated as ZnO, Cu of 6 mol% or more and 13 mol% or less, calculated as CuO, and Ni of 10 mol% or more and 45 mol% or less, calculated as NiO.

[0239] The Ni-Cu-Zn based ferrite material may further contain additives such as Co, Bi, Sn, and Mn.

[0240] The Ni-Cu-Zn based ferrite material may further contain inevitable impurities.

[0241] <Green sheet manufacturing process> First, a magnetic material, an organic binder such as a polyvinyl butyral resin, an organic solvent such as ethanol or toluene, a plasticizer, etc. are mixed in a ball mill together with PSZ media, and then pulverized to prepare a slurry.

[0242] Next, the slurry is formed into a sheet of a predetermined thickness by a doctor blade method or the like, and then punched into a predetermined shape to produce a green sheet. The thickness of the green sheet is, for example, 20 μm or more and 30 μm or less. The shape of the green sheet is, for example, rectangular.

[0243] As the material for the green sheets, a non-magnetic material such as borosilicate glass material may be used instead of a magnetic material, or a mixture of a magnetic material and a non-magnetic material may be used.

[0244] <Conductor pattern formation process> First, a via hole is formed by irradiating a laser onto a predetermined location of a green sheet.

[0245] Next, a conductive paste such as Ag paste is applied to the surface of the green sheet by screen printing or the like while filling the via holes. As a result, a conductor pattern for a via conductor is formed in the via holes of the green sheet, and a conductor pattern for a coil conductor connected to the conductor pattern for a via conductor is formed on the surface. In this manner, a coil sheet is produced in which the conductor pattern for a coil conductor and the conductor pattern for a via conductor are formed on the green sheet. A plurality of coil sheets are produced, and a conductor pattern for a coil conductor corresponding to the coil conductor shown in Figures 2 and 3 and a conductor pattern for a via conductor corresponding to the via conductor (including the lead-out via conductor Sa1 and the lead-out via conductor Sb1 shown in Figures 2 and 3) connected to the coil conductor shown in Figures 2 and 3 are formed on each coil sheet.

[0246] In addition, a conductive paste such as Ag paste is applied to the surface of the green sheet by screen printing or the like while filling the via holes. As a result, a via conductor pattern is formed in the via hole of the green sheet, and a land conductor pattern connected to the via conductor pattern is formed on the surface. In this way, a via sheet in which a land conductor pattern and a via conductor pattern are formed on the green sheet is produced separately from the coil sheet. A plurality of via sheets are also produced, and a land conductor pattern corresponding to the lead-out land constituting the lead-out conductor shown in FIG. 2 and FIG. 3, and a via conductor pattern corresponding to the lead-out via conductor connected to the lead-out land shown in FIG. 2 and FIG. 3 (excluding the lead-out via conductor Sa1 and the lead-out via conductor Sb1 shown in FIG. 2 and FIG. 3) are formed on each via sheet.

[0247] <Laminated block manufacturing process> The coil sheets and via sheets are stacked in the stacking direction (length direction L in Figs. 2 and 3) in the order corresponding to Figs. 2 and 3, and then thermocompression bonded to prepare a laminate block.

[0248] <Element and coil manufacturing process> First, the laminate block is cut into individual chips of a predetermined size using a dicer or the like.

[0249] Next, the individual chips are fired at a firing temperature of, for example, 900° C. to 920° C. for, for example, 2 hours to 4 hours.

[0250] When the individual chips are fired, the coil sheet and via sheet green sheets become insulating layers, resulting in an element body in which multiple insulating layers are stacked in the stacking direction (length direction L in Figures 2 and 3).

[0251] When the individual chips are fired, the conductor patterns for the coil conductors and the conductor patterns for the via conductors of the coil sheet become coil conductors and via conductors (including the lead-out via conductors Sa1 and Sb1 shown in Figs. 2 and 3), respectively. As a result, a coil is produced in which a plurality of coil conductors stacked in the stacking direction (length direction L in Figs. 2 and 3) are electrically connected via the via conductors.

[0252] In this manner, an element body and a coil provided inside the element body are produced.

[0253] On the other hand, when the individual chips are fired, the land conductor pattern and the via conductor conductor pattern of the via sheet become lead-out land portions and lead-out via conductors, respectively. As a result, a first lead-out conductor and a second lead-out conductor are produced, each of which is formed by alternately connecting a plurality of lead-out land portions and a plurality of lead-out via conductors stacked in the stacking direction (length direction L in Figs. 2 and 3). The first lead-out conductor and the second lead-out conductor located on the first end face side of the element body are exposed from the first end face of the element body. The first lead-out conductor and the second lead-out conductor located on the second end face side of the element body are exposed from the second end face of the element body.

[0254] The element body may be subjected to barrel polishing, for example, to round off corners and ridges.

[0255] <External electrode formation process> First, a conductive paste, such as a paste containing Ag and glass frit, is applied to form a first coating film connected to the first and second extraction conductors exposed from the first end face of the element body, extending from the first end face of the element body over a portion of each of the first main surface, the second main surface, the first side surface, and the second side surface.

[0256] In addition, by applying a conductive paste such as a paste containing Ag and glass frit, a second coating film connected to the third extraction conductor and the fourth extraction conductor exposed from the second end face of the element body is formed so as to extend from the second end face of the element body over a portion of each of the first main surface, the second main surface, the first side surface, and the second side surface.

[0257] In this manner, the first coating film and the second coating film are formed at positions spaced apart from each other on the surface of the element body.

[0258] When forming the first coating film and the second coating film, the first coating film and the second coating film may be formed at different times or at the same time.

[0259] When the first coating film and the second coating film are formed at different times, they may be formed in the order of the first coating film and the second coating film, or the order of the second coating film and the first coating film.

[0260] Next, the first coating film is baked to form a first base electrode that extends from the first end face of the element body over portions of the first main surface, the second main surface, the first side surface, and the second side surface, and is connected to the first extension conductor and the second extension conductor.

[0261] In addition, by baking the second coating film, a second base electrode is formed which extends from the second end face of the element body over portions of the first main surface, the second main surface, the first side surface, and the second side surface, and is connected to the third extraction conductor and the fourth extraction conductor.

[0262] The baking temperature for the first coating film and the second coating film is, for example, 800°C or higher and 820°C or lower.

[0263] The thickness of the first and second base electrodes is, for example, 5 μm.

[0264] Then, a Ni-plated electrode and a Sn-plated electrode are formed in this order on the surface of the first base electrode by electrolytic plating, etc. This forms a first external electrode having the first base electrode, the Ni-plated electrode, and the Sn-plated electrode in this order from the surface side of the element body.

[0265] Furthermore, a Ni-plated electrode and a Sn-plated electrode are formed in this order on the surface of the second base electrode by electrolytic plating, etc. This forms a second external electrode having the second base electrode, the Ni-plated electrode, and the Sn-plated electrode in this order from the surface side of the element body.

[0266] In this way, a first external electrode electrically connected to the coil via a first extension conductor and a second extension conductor, and a second external electrode electrically connected to the coil via a first extension conductor and a second extension conductor different from those connected to the first external electrode are formed on the surface of the body.

[0267] In this manner, the multilayer coil component 1 is manufactured.

[0268] In the multilayer coil component 1, an embodiment has been illustrated in which the feature of the multilayer coil component of the present invention, that "the outermost coil conductor is electrically connected to the same external electrode via a first lead conductor at one end of the first parallel running section and via a second lead conductor at the other end of the first parallel running section," is satisfied for both the coil conductor Q1 and the coil conductor Q14 corresponding to the outermost coil conductors, but it is sufficient that the feature of the multilayer coil component of the present invention is satisfied for at least one of the coil conductor Q1 and the coil conductor Q14. In other words, the feature of the multilayer coil component of the present invention may be satisfied only for the coil conductor Q1, may be satisfied only for the coil conductor Q14, or may be satisfied for both the coil conductor Q1 and the coil conductor Q14 as described above.

[0269] [Embodiment 2] In the multilayer coil component of the present invention, the outermost coil conductor is preferably electrically connected to the same external electrode to which the first and second lead conductors are connected, via a lead conductor other than the first and second lead conductors, in a region other than the first parallel running section. In this case, in the multilayer coil component of the present invention, the outermost coil conductor is preferably electrically connected to the same external electrode to which the first and second lead conductors are connected, via a third lead conductor, in a region other than the first parallel running section, and it is preferable that, when viewed from the stacking direction, the region where the third lead conductor and the outermost coil conductor overlap overlaps with the region where two adjacent coil conductors including the outermost coil conductor overlap with each other via the via conductor. A multilayer coil component different from the multilayer coil component of embodiment 1 of the present invention in this respect will be described below as a multilayer coil component of embodiment 2 of the present invention.

[0270] Fig. 6 is a schematic perspective view showing an example of an exploded state of the multilayer coil component (excluding the external electrodes) according to the second embodiment of the present invention, and Fig. 7 is a schematic plan view showing an example of an exploded state of the multilayer coil component (excluding the external electrodes) shown in Fig. 6.

[0271] In the laminated coil component 2 shown in FIGS. 6 and 7, the element body 10B is similar to the element body 10A (see FIGS. 2 and 3).

[0272] A coil 30B is provided inside the element body 10B.

[0273] The coil 30B is similar to the coil 30A (see FIGS. 2 and 3) except for the following configuration.

[0274] The land portion Rd2 is connected to a via conductor Sd2 that penetrates the insulating layer P2 in the length direction L. The via conductor Sd2 is connected to the bent portion Ud1 in addition to the land portion Rd2. That is, the bent portion Ud1 and the land portion Rd2 are electrically connected through the via conductor Sd2.

[0275] In the laminated coil component 2, the coil conductor Q1 corresponding to the outermost coil conductor is electrically connected, in an area other than the first parallel section Ma1, via the third extension conductor 43a to the same first external electrode 21 to which the first extension conductor 41a and the second extension conductor 42a are connected.

[0276] The third extension conductor 43a is configured as follows.

[0277] An extension land portion Rdx is provided on the main surface of the insulating layer Px at a position separated from the extension land portion Rax and the extension land portion Rbx. The extension land portion Rdx is connected to an extension via conductor Sdx penetrating the insulating layer Px in the length direction L. The extension land portion Rdx is also connected to an extension via conductor Sd1 penetrating the insulating layer P1 in the length direction L in addition to the extension via conductor Sdx. This forms a third extension conductor 43a consisting of the extension land portion Rdx, the extension via conductor Sdx, and the extension via conductor Sd1.

[0278] The extension via conductor Sd1 is connected to the bent portion Ud1 as well as the extension land portion Rdx. That is, the coil conductor Q1, which corresponds to the outermost coil conductor, is connected to the third extension conductor 43a at the bent portion Ud1 located in an area other than the first parallel running section Ma1. In this manner, the third extension conductor 43a is connected to the coil 30B.

[0279] The third extension conductor 43a, like the first extension conductor 41a and the second extension conductor 42a, is connected to the first external electrode 21. A cross-sectional view showing the state of connection between the third extension conductor 43a and the first external electrode 21 is similar to the cross-sectional view of FIG.

[0280] Therefore, in the laminated coil component 2, the coil 30B and the first external electrode 21 are electrically connected via the third extension conductor 43a in addition to the first extension conductor 41a and the second extension conductor 42a. That is, in the laminated coil component 2, the coil conductor Q1 corresponding to the outermost coil conductor is electrically connected via the third extension conductor 43a to the same first external electrode 21 to which the first extension conductor 41a and the second extension conductor 42a are connected, in a region other than the first parallel running section Ma1.

[0281] In the multilayer coil component 2, the coil conductor Q1 corresponding to the outermost coil conductor is electrically connected to the same first external electrode 21 to which the first extension conductor 41a and the second extension conductor 42a are connected via the third extension conductor 43a in a region other than the first parallel running section Ma1, so that the current path between the coil 30B and the first external electrode 21 can be three paths, the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a. Therefore, in the multilayer coil component 2, the current density of the first extension conductor 41a and the second extension conductor 42a can be made lower than in the multilayer coil component 1. Therefore, in the multilayer coil component 2, even if a large current flows between the coil 30B and the first external electrode 21, the generation of heat and the occurrence of electromigration in the first extension conductor 41a and the second extension conductor 42a can be suppressed compared to the multilayer coil component 1, and as a result, breakage of the first extension conductor 41a and the second extension conductor 42a can be suppressed.

[0282] The coil conductor Q1, which corresponds to the outermost coil conductor, is connected to the third extension conductor 43a at the bent portion Ud1. That is, the bent portion Ud1 overlaps with the third extension conductor 43a when viewed from the longitudinal direction L.

[0283] On the other hand, two adjacent coil conductors including the outermost coil conductor Q1, i.e., the coil conductor Q1 and the coil conductor Q2, are electrically connected to each other at the bend Ud1 and the land Rd2 through the via conductor Sd2. That is, the bend Ud1 and the land Rd2 overlap with each other through the via conductor Sd2 when viewed from the longitudinal direction L.

[0284] For the above reasons, in the laminated coil component 2, the third extension conductor 43a, the bent portion Ud1, and the land portion Rd2 overlap when viewed from the longitudinal direction L. Thus, in the laminated coil component 2, when viewed from the longitudinal direction L, the region where the third extension conductor 43a and the coil conductor Q1 corresponding to the outermost coil conductor overlap overlaps with the region where two adjacent coil conductors Q1 and Q2 including the coil conductor Q1 corresponding to the outermost coil conductor overlap with each other via the via conductor Sd2. This makes it possible to shorten the current path between the region where the coil conductors Q1 and Q2 overlap with each other via the via conductor Sd2 and the third extension conductor 43a, thereby reducing the DC resistance of the current path.

[0285] In the laminated coil component 2, the coil conductor Q14 corresponding to the outermost coil conductor is electrically connected to the same second external electrode 22 to which the first extension conductor 41b and the second extension conductor 42b are connected via the third extension conductor 43b in an area other than the first parallel running section Mb1.

[0286] The third lead conductor 43b is configured as follows.

[0287] An extension land Rby is provided on the main surface of the insulating layer Py at a position separated from the extension land Ray and the extension land Rdy. The extension land Rby is connected to an extension via conductor Sby penetrating the insulating layer Py in the length direction L. This forms a third extension conductor 43b consisting of the extension land Rby and the extension via conductor Sby.

[0288] The extension via conductor Sby is connected to the extension land portion Rby as well as the bent portion Ub14. That is, the outermost coil conductor Q14 is connected to the third extension conductor 43b at the bent portion Ub14 located in an area other than the first parallel running section Mb1. In this manner, the third extension conductor 43b is connected to the coil 30B.

[0289] The third extension conductor 43b, like the first extension conductor 41b and the second extension conductor 42b, is connected to the second external electrode 22. A cross-sectional view showing the state of connection between the third extension conductor 43b and the second external electrode 22 is similar to the cross-sectional view of FIG.

[0290] Therefore, in the laminated coil component 2, the coil 30B and the second external electrode 22 are electrically connected via the third extension conductor 43b in addition to the first extension conductor 41b and the second extension conductor 42b. That is, in the laminated coil component 2, the coil conductor Q14 corresponding to the outermost coil conductor is electrically connected via the third extension conductor 43b to the same second external electrode 22 to which the first extension conductor 41b and the second extension conductor 42b are connected, in an area other than the first parallel running section Mb1.

[0291] In the multilayer coil component 2, the coil conductor Q14 corresponding to the outermost coil conductor is electrically connected to the same second external electrode 22 to which the first extension conductor 41b and the second extension conductor 42b are connected via the third extension conductor 43b in a region other than the first parallel running section Mb1, so that the current path between the coil 30B and the second external electrode 22 can be divided into three paths, the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b. Therefore, in the multilayer coil component 2, the current density of the first extension conductor 41b and the second extension conductor 42b can be made lower than in the multilayer coil component 1. Therefore, in the multilayer coil component 2, even if a large current flows between the coil 30B and the second external electrode 22, the generation of heat and the occurrence of electromigration in the first extension conductor 41b and the second extension conductor 42b can be suppressed compared to the multilayer coil component 1, and as a result, breakage of the first extension conductor 41b and the second extension conductor 42b can be suppressed.

[0292] The coil conductor Q14, which corresponds to the outermost coil conductor, is connected to the third extension conductor 43b at the bent portion Ub14. That is, the bent portion Ub14 overlaps with the third extension conductor 43b when viewed from the longitudinal direction L.

[0293] On the other hand, two adjacent coil conductors including the outermost coil conductor Q14, i.e., coil conductor Q13 and coil conductor Q14, are electrically connected to each other at the land portion Rb13 and the bend portion Ub14 through the via conductor Sb14. That is, the land portion Rb13 and the bend portion Ub14 overlap with each other through the via conductor Sb14 when viewed from the longitudinal direction L.

[0294] For the above reasons, in the laminated coil component 2, the third extension conductor 43b, the bent portion Ub14, and the land portion Rb13 overlap when viewed from the longitudinal direction L. Thus, in the laminated coil component 2, when viewed from the longitudinal direction L, the region where the third extension conductor 43b and the coil conductor Q14 corresponding to the outermost coil conductor overlap overlaps a region where two adjacent coil conductors Q13 and Q14, including the coil conductor Q14 corresponding to the outermost coil conductor, overlap with each other via conductor Sb14. This makes it possible to shorten the current path between the region where the coil conductor Q13 and the coil conductor Q14 overlap with each other via conductor Sb14 and the third extension conductor 43b, thereby reducing the DC resistance of the current path.

[0295] The laminated coil component 2 is manufactured in the same manner as the laminated coil component 1, except that, for example, in the <Conductor pattern formation process>, conductor patterns corresponding to the coil conductors, via conductors, lead-out land portions, and lead-out via conductors shown in FIGS. 6 and 7 are formed on the coil sheet and the via sheet.

[0296] In the multilayer coil component 2, an example has been given in which both the third extension conductor 43a and the third extension conductor 43b are provided, but it is also possible that only the third extension conductor 43a is provided, or only the third extension conductor 43b is provided.

[0297] [Embodiment 3] In the multilayer coil component of the present invention, the outermost coil conductor is preferably electrically connected to the same external electrode to which the first and second lead conductors are connected, via a lead conductor other than the first and second lead conductors, in a region other than the first parallel running section. In this case, in the multilayer coil component of the present invention, the outermost coil conductor is preferably electrically connected to the same external electrode to which the first and second lead conductors are connected, via a fourth lead conductor, in a region other than the first parallel running section, and it is preferable that, when viewed from the stacking direction, a region where the fourth lead conductor and the outermost coil conductor overlap overlaps a region where two adjacent coil conductors including the outermost coil conductor do not overlap with each other via the via conductor. A multilayer coil component different from the multilayer coil component of embodiment 2 of the present invention in this respect will be described below as a multilayer coil component of embodiment 3 of the present invention.

[0298] Fig. 8 is a schematic perspective view showing an example of an exploded state of the multilayer coil component (excluding the external electrodes) according to the third embodiment of the present invention, and Fig. 9 is a schematic plan view showing an example of an exploded state of the multilayer coil component (excluding the external electrodes) shown in Fig. 8.

[0299] In the laminated coil component 3 shown in FIGS. 8 and 9, the element body 10C is similar to the element body 10B (see FIGS. 6 and 7).

[0300] A coil 30C is provided inside the element body 10C.

[0301] Coil 30C is similar to coil 30B (see Figures 6 and 7).

[0302] In the laminated coil component 3, the coil conductor Q1 corresponding to the outermost coil conductor is electrically connected, in an area other than the first parallel section Ma1, via the fourth extension conductor 44a to the same first external electrode 21 to which the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a are connected.

[0303] The fourth extension conductor 44a is configured as follows.

[0304] An extension land portion Rcx is provided on the main surface of the insulating layer Px at a position separated from the extension land portion Rax, the extension land portion Rbx, and the extension land portion Rdx. The extension land portion Rcx is connected to an extension via conductor Scx penetrating the insulating layer Px in the length direction L. The extension land portion Rcx is also connected to an extension via conductor Sc1 penetrating the insulating layer P1 in the length direction L in addition to the extension via conductor Scx. This forms a fourth extension conductor 44a consisting of the extension land portion Rcx, the extension via conductor Scx, and the extension via conductor Sc1.

[0305] The extension via conductor Sc1 is connected to the extension land portion Rcx as well as the land portion Rc1. That is, the coil conductor Q1, which corresponds to the outermost coil conductor, is connected to the fourth extension conductor 44a at the land portion Rc1 located in an area other than the first parallel running section Ma1. In this manner, the fourth extension conductor 44a is connected to the coil 30C.

[0306] The fourth extension conductor 44a, like the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a, is connected to the first external electrode 21. A cross-sectional view showing the connection between the fourth extension conductor 44a and the first external electrode 21 is similar to the cross-sectional view of FIG.

[0307] Therefore, in the multilayer coil component 3, the coil 30C and the first external electrode 21 are electrically connected via the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a, as well as the fourth extension conductor 44a. That is, in the multilayer coil component 3, the coil conductor Q1 corresponding to the outermost coil conductor is electrically connected via the fourth extension conductor 44a to the same first external electrode 21 to which the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a are connected, in an area other than the first parallel running section Ma1.

[0308] In the multilayer coil component 3, the coil conductor Q1 corresponding to the outermost coil conductor is electrically connected via the fourth extension conductor 44a to the same first external electrode 21 to which the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a are connected in an area other than the first parallel running section Ma1, so that the current path between the coil 30C and the first external electrode 21 can be four paths, the first extension conductor 41a, the second extension conductor 42a, the third extension conductor 43a, and the fourth extension conductor 44a. Therefore, in the multilayer coil component 3, the current density in the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a can be lower than in the multilayer coil component 2. Therefore, in the laminated coil component 3, even if a large current is passed between the coil 30C and the first external electrode 21, the generation of heat and the occurrence of electromigration in the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a can be suppressed compared to the laminated coil component 2, and as a result, breakage of the first extension conductor 41a, the second extension conductor 42a, and the third extension conductor 43a can be suppressed.

[0309] The coil conductor Q1, which corresponds to the outermost coil conductor, is connected to the fourth extension conductor 44a at the land portion Rc1. That is, the land portion Rc1 overlaps with the fourth extension conductor 44a when viewed from the longitudinal direction L.

[0310] On the other hand, two adjacent coil conductors including the outermost coil conductor Q1, i.e., coil conductor Q1 and coil conductor Q2, are not electrically connected through via conductors at land portion Rc1 and land portion Rc2. In other words, land portion Rc1 and land portion Rc2 do not overlap with each other through the via conductors when viewed from the longitudinal direction L.

[0311] From the above, in the multilayer coil component 3, when viewed from the longitudinal direction L, the region where the fourth extension conductor 44a and the coil conductor Q1 corresponding to the outermost coil conductor overlap overlaps a region where two adjacent coil conductors Q1 and Q2, including the coil conductor Q1 corresponding to the outermost coil conductor, do not overlap with each other via conductors. This makes it possible to shorten the current path between the fourth extension conductor 44a, which is a region where the coil conductors Q1 and Q2 do not overlap with each other via conductors and where the coil conductors Q1 and Q2 do not overlap with each other when viewed from the longitudinal direction L, and the non-parallel running section, and therefore the DC resistance of the current path can be reduced.

[0312] In the multilayer coil component 3, the coil conductor Q14, which corresponds to the outermost coil conductor, is electrically connected, in an area other than the first parallel section Mb1, via the fourth extension conductor 44b to the same second external electrode 22 to which the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b are connected.

[0313] The fourth extension conductor 44b is configured as follows.

[0314] An output land portion Rcy is provided on the main surface of the insulating layer Py at a position spaced apart from the output land portion Ray, the output land portion Rby, and the output land portion Rdy. The output land portion Rcy is connected to an output via conductor Scy that penetrates the insulating layer Px in the length direction L. This forms a fourth output conductor 44b consisting of the output land portion Rcy and the output via conductor Scy.

[0315] The extension via conductor Scy is connected to the extension land portion Rcy as well as the land portion Rc14. That is, the coil conductor Q14, which corresponds to the outermost coil conductor, is connected to the fourth extension conductor 44b at the land portion Rc14 located in an area other than the first parallel running section Mb1. In this manner, the fourth extension conductor 44b is connected to the coil 30C.

[0316] The fourth extension conductor 44b, like the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b, is connected to the second external electrode 22. A cross-sectional view showing the connection between the fourth extension conductor 44b and the second external electrode 22 is similar to the cross-sectional view of FIG.

[0317] Therefore, in the laminated coil component 3, the coil 30C and the second external electrode 22 are electrically connected via the fourth extension conductor 44b in addition to the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b. That is, in the laminated coil component 3, the coil conductor Q14 corresponding to the outermost coil conductor is electrically connected via the fourth extension conductor 44b to the same second external electrode 22 to which the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b are connected, in an area other than the first parallel running section Mb1.

[0318] In the laminated coil component 3, the coil conductor Q14 corresponding to the outermost coil conductor is electrically connected via the fourth extension conductor 44b to the same second external electrode 22 to which the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b are connected in an area other than the first parallel running section Mb1, so that the current paths between the coil 30C and the second external electrode 22 can be four paths, the first extension conductor 41b, the second extension conductor 42b, the third extension conductor 43b, and the fourth extension conductor 44b. Therefore, in the laminated coil component 3, the current density in the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b can be lower than in the laminated coil component 2. Therefore, in the laminated coil component 3, even if a large current is passed between the coil 30C and the second external electrode 22, the generation of heat and the occurrence of electromigration in the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b can be suppressed compared to the laminated coil component 2, and as a result, breaks in the first extension conductor 41b, the second extension conductor 42b, and the third extension conductor 43b can be suppressed.

[0319] The coil conductor Q14, which corresponds to the outermost coil conductor, is connected to the fourth extension conductor 44b at the land portion Rc14. That is, the land portion Rc14 overlaps with the fourth extension conductor 44b when viewed from the longitudinal direction L.

[0320] On the other hand, two adjacent coil conductors including the outermost coil conductor Q14, i.e., coil conductor Q13 and coil conductor Q14, are not electrically connected through via conductors at land portions Rc13 and Rc14. In other words, land portions Rc13 and Rc14 do not overlap with each other through via conductors when viewed from the longitudinal direction L.

[0321] From the above, in the multilayer coil component 3, when viewed from the longitudinal direction L, the region where the fourth extension conductor 44b and the coil conductor Q14 corresponding to the outermost coil conductor overlap overlaps a region where two adjacent coil conductors Q13 and Q14, including the coil conductor Q14 corresponding to the outermost coil conductor, do not overlap with each other via conductors. This makes it possible to shorten the current path between the fourth extension conductor 44b and the non-parallel section, which is the region where the coil conductors Q13 and Q14 do not overlap with each other via conductors and where the coil conductors Q13 and Q14 do not overlap with each other when viewed from the longitudinal direction L, and the DC resistance of the current path can be reduced.

[0322] The laminated coil component 3 is manufactured in the same manner as the laminated coil component 2, except that, for example, in the <Conductor pattern formation process>, conductor patterns corresponding to the coil conductors, via conductors, lead-out land portions, and lead-out via conductors shown in FIGS. 8 and 9 are formed on the coil sheet and via sheet.

[0323] In the multilayer coil component 3, an example has been given in which both the fourth extension conductor 44a and the fourth extension conductor 44b are provided, but it is also possible that only the fourth extension conductor 44a is provided, or only the fourth extension conductor 44b is provided.

[0324] In the multilayer coil component 3, an example has been given in which both the third extension conductor 43a and the fourth extension conductor 44a are provided on the first external electrode 21 side, but it is also possible that only the third extension conductor 43a is provided, or only the fourth extension conductor 44a is provided.

[0325] In the multilayer coil component 3, an example has been given in which both the third extension conductor 43b and the fourth extension conductor 44b are provided on the second external electrode 22 side, but it is also possible that only the third extension conductor 43b is provided, or only the fourth extension conductor 44b is provided.

[0326] In the above embodiment, the number of coil conductors connected in parallel in each of the first and second parallel running sections is three. However, the same applies to an embodiment in which the number of coil conductors connected in parallel in each of the first and second parallel running sections is two, and further to an embodiment in which the number of coil conductors connected in parallel in each of the first and second parallel running sections is four or more. In particular, from the viewpoint of reducing the DC resistance of the coil, it is preferable that the number of coil conductors connected in parallel in each of the first and second parallel running sections is three or more. That is, in the laminated coil component of the present invention, it is preferable that the first laminated section is made of three or more of the above coil conductors. Also, in the laminated coil component of the present invention, it is preferable that the second laminated section is made of three or more of the above coil conductors. EXAMPLES

[0327] EXAMPLES Hereinafter, examples that specifically disclose the multilayer coil component of the present invention will be described, however, the present invention is not limited to only the following examples.

[0328] [Example 1] The laminated coil component of the first embodiment was used as a simulation model of the laminated coil component of the first example (hereinafter simply referred to as the "laminated coil component of the first example").

[0329] In the multilayer coil component of Example 1, the lengthwise dimension was set to 2.0 mm, the heightwise dimension was set to 1.25 mm, and the widthwise dimension was set to 1.25 mm.

[0330] In the multilayer coil component of Example 1, the dimension of all the coil conductors in the length direction was set to 21 μm, and the dimension of all the coil conductors in the width direction was set to 300 μm.

[0331] In the multilayer coil component of Example 1, the diameters of the extension via conductors constituting the first and second extension conductors connected to the first external electrode were all set to 170 μm. Also, in the multilayer coil component of Example 1, the diameters of the extension via conductors constituting the first and second extension conductors connected to the second external electrode were all set to 170 μm.

[0332] [Example 2] The laminated coil component of the third embodiment was used as a simulation model of the laminated coil component of the second example (hereinafter simply referred to as the "laminated coil component of the second example").

[0333] In the laminated coil component of Example 2, similarly to the laminated coil component of Example 1, the lengthwise dimension was set to 2.0 mm, the heightwise dimension to 1.25 mm, and the widthwise dimension to 1.25 mm.

[0334] In the multilayer coil component of Example 2, similarly to the multilayer coil component of Example 1, the dimensions of all the coil conductors in the length direction were set to 21 μm, and the dimensions of all the coil conductors in the width direction were set to 300 μm.

[0335] In the multilayer coil component of Example 2, the diameters of the extension via conductors constituting the first extension conductor, the second extension conductor, the third extension conductor, and the fourth extension conductor connected to the first external electrode were all set to 170 μm. Also, in the multilayer coil component of Example 2, the diameters of the extension via conductors constituting the first extension conductor, the second extension conductor, the third extension conductor, and the fourth extension conductor connected to the second external electrode were all set to 170 μm.

[0336] [Comparative Example 1] A simulation model of the laminated coil component of Comparative Example 1 (hereinafter simply referred to as the "laminated coil component of Comparative Example 1") was adopted, which was a configuration obtained by removing from the laminated coil component of Example 1 the first extension conductor connected to the first external electrode and the first extension conductor connected to the second external electrode.

[0337] In the laminated coil component of Comparative Example 1, similarly to the laminated coil component of Example 1, the lengthwise dimension was set to 2.0 mm, the heightwise dimension to 1.25 mm, and the widthwise dimension to 1.25 mm.

[0338] In the laminated coil component of Comparative Example 1, similarly to the laminated coil component of Example 1, the dimensions of all the coil conductors in the length direction were set to 21 μm, and the dimensions of all the coil conductors in the width direction were set to 300 μm.

[0339] In the multilayer coil component of Comparative Example 1, the diameter of the extension via conductor constituting the second extension conductor connected to the first external electrode was set to 170 μm. Also, in the multilayer coil component of Comparative Example 1, the diameter of the extension via conductor constituting the second extension conductor connected to the second external electrode was set to 170 μm.

[0340] [evaluation] A simulation evaluation was performed on the current value flowing through the lead conductor for the laminated coil component of Example 1, the laminated coil component of Example 2, and the laminated coil component of Comparative Example 1. When the current value (current density) flowing through the second lead conductor of the laminated coil component of Comparative Example 1 was taken as 100%, the current values ​​flowing through the lead conductor of the laminated coil component of Example 1 and the laminated coil component of Example 2 were as follows.

[0341] <Example 1> First lead conductor: 77% Second lead conductor: 23%

[0342] <Example 2> First lead conductor: 74% Second lead conductor: 15% Third lead conductor: 7% 4th lead conductor: 4%

[0343] In the multilayer coil components of Example 1 and Example 2, the current value (current density) per one lead conductor was lower than that of the multilayer coil component of Comparative Example 1. Therefore, it is considered that the occurrence of heat generation and electromigration in one lead conductor is suppressed in the multilayer coil components of Example 1 and Example 2 compared to the multilayer coil component of Comparative Example 1, and as a result, breakage of the lead conductor is suppressed. Furthermore, in the multilayer coil components of Example 1 and Example 2, it is considered that even if a breakage occurs in the first lead conductor, which has the maximum current value, the function of the multilayer coil components can be maintained by the other lead conductors.

[0344] In the laminated coil component of Example 2, the current values ​​(current densities) of the first and second lead conductors were lower than those of the laminated coil component of Example 1. Therefore, it is considered that in the laminated coil component of Example 2, the generation of heat and the occurrence of electromigration in the first and second lead conductors are suppressed compared to the laminated coil component of Example 1, and as a result, breakage of the first and second lead conductors is suppressed. [Explanation of symbols]

[0345] 1, 2, 3 Multilayer coil components 10A, 10B, 10C body 11a: first end surface of element 11b: second end surface of element 12a: First principal surface of the body 12b Second main surface of the body 13a First side of the body 13b Second side of the body 21 1st external electrode 22 2nd external electrode 30A, 30B, 30C coils 41a, 41b First lead conductor 42a, 42b Second lead conductor 43a, 43b Third lead conductor 44a, 44b Fourth lead conductor C Coil shaft Ea1, Eb1 First laminate Fa1, Fb1 Second laminate L Length direction Ma1, Mb1 1st parallel section Na1, Nb1 2nd parallel section P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, Px, Py insulating layer Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14 Coil conductor Rb1, Rc1, Rc2, Rd2, Ra3, Rd3, Ra4, Rb4, Rb5, Rc5, Rc6, Rd6, Ra7, Rd7, Ra8, Rb8, Rb9, Rc9, Rc10, Rd10, Ra11, Rd11, Ra12, Rb12, Rb13, Rc13, Rc14, Rd14 land part Rax, Rbx, Rcx, Rdx, Ray, Rby, Rcy, Rdy Land for drawing out Sa2, Sb2, Sd2, Sa3, Sb3, Sc3, Sb4, Sc4, Sd4, Sa5, Sc5, Sd5, Sa6, Sb6, Sd6, Sa7, Sb7, Sc7, Sb8, Sc8, Sd8, S a9, Sb9, Sd9, Sa10, Sb10, Sd10, Sa11, Sb11, Sc11, Sb12, Sc12, Sd12, Sa13, Sc13, Sd13, Sa14, Sb14, Sd14 via conductor Sa1, Sb1, Sc1, Sd1, Sax, Sbx, Scx, Sdx, Say, Sby, Scy, Sdy Lead-out via conductor T Height direction Ua1, Ud1, Ua2, Ub2, Ub3, Uc3, Uc4, Ud4, Ua5, Ud5, Ua6, Ub6, Ub7, Uc7, Uc8, Ud8, Ua9, Ud9, Ua10, Ub10, Ub11, Uc11, Uc12, Ud12, Ua13, Ud13, Ua14, Ub14 bending part W Width direction

Claims

1. An element body formed by laminating a plurality of insulating layers in a lamination direction; A coil provided inside the element body; an external electrode provided on a surface of the element body and electrically connected to the coil; the coil is formed by electrically connecting a plurality of coil conductors stacked in the stacking direction through via conductors that penetrate the insulating layers in the stacking direction, the plurality of coil conductors stacked in the stacking direction include a first stacking portion including a plurality of adjacent coil conductors including an outermost coil conductor located at an outermost position in the stacking direction, the first laminated portion has a first parallel running section in which all of the coil conductors constituting the first laminated portion overlap each other when viewed from the lamination direction, the first parallel running sections are connected in parallel by the via conductors, the outermost coil conductor is electrically connected to the same external electrode via a first lead conductor at one end of the first parallel running section and via a second lead conductor at the other end of the first parallel running section; the first laminated section is composed of n or more (n is an integer of 3 or more) coil conductors, when viewed from the stacking direction, an overlapping region between the first lead conductor and the outermost coil conductor overlaps a region between n+1 adjacent coil conductors including the outermost coil conductor and the via conductors, a region where the second lead conductor and the outermost coil conductor overlap when viewed from the stacking direction overlaps a region where n adjacent coil conductors including the outermost coil conductor overlap with each other via conductors.

2. An element body having a plurality of insulating layers laminated in a lamination direction; A coil provided inside the element body; an external electrode provided on a surface of the element body and electrically connected to the coil; the coil is formed by electrically connecting a plurality of coil conductors stacked in the stacking direction through via conductors that penetrate the insulating layers in the stacking direction, the plurality of coil conductors stacked in the stacking direction include a first stacking portion including a plurality of adjacent coil conductors including an outermost coil conductor located at an outermost position in the stacking direction, the first laminated portion has a first parallel running section in which all of the coil conductors constituting the first laminated portion overlap each other when viewed from the lamination direction, the first parallel running sections are connected in parallel by the via conductors, the outermost coil conductor is electrically connected to the same external electrode via a first lead conductor at one end of the first parallel running section and via a second lead conductor at the other end of the first parallel running section; the first laminated portion is composed of three or more of the coil conductors, when viewed from the stacking direction, an overlapping region between the first lead conductor and the outermost coil conductor overlaps an overlapping region between four adjacent coil conductors including the outermost coil conductor and the via conductors, a region where the second lead conductor and the outermost coil conductor overlap when viewed from the stacking direction overlaps a region where three adjacent coil conductors including the outermost coil conductor overlap with each other via conductors.

3. The number of turns of the outermost coil conductor is the same as the number of turns of the coil conductors other than the outermost coil conductor, the outermost coil conductor and the external electrode are electrically connected only via the first lead conductor and the second lead conductor, 3 . The multilayer coil component according to claim 1 , wherein one end of the outermost coil conductor in a winding direction is connected to none of the via conductor, the first lead conductor, and the second lead conductor. 4 .

4. 4. The stacked coil component according to claim 1, wherein the outermost coil conductor is electrically connected to the same external electrode to which the first lead conductor and the second lead conductor are connected, via a lead conductor other than the first lead conductor and the second lead conductor, in a region other than the first parallel running section.

5. the outermost coil conductor is electrically connected, in a region other than the first parallel running section, to the same external electrode to which the first lead conductor and the second lead conductor are connected, via a third lead conductor; 5. The multilayer coil component according to claim 4, wherein, when viewed from the stacking direction, a region where the third lead conductor and the outermost coil conductor overlap with a region where two adjacent coil conductors including the outermost coil conductor overlap with each other via conductors.

6. the outermost coil conductor is electrically connected, in a region other than the first parallel running section, to the same external electrode to which the first lead conductor and the second lead conductor are connected, via a fourth lead conductor; 6. The multilayer coil component according to claim 4, wherein, when viewed from the stacking direction, a region where the fourth lead conductor and the outermost coil conductor overlap each other overlaps a region where two adjacent coil conductors including the outermost coil conductor do not overlap each other with the via conductor interposed therebetween.

7. 7. The multilayer coil component according to claim 1, wherein the length of all of the coil conductors constituting the first multilayer portion is equal to a length of 3 / 4 turns of the coil.

8. the coil conductors stacked in the stacking direction further include a second laminated section including the same number of adjacent coil conductors as the first laminated section, the second laminated portion has a second parallel running section in which all of the coil conductors constituting the second laminated portion overlap each other when viewed from the lamination direction, the second parallel running sections are connected in parallel by the via conductors, 8. The laminated coil component according to claim 1, wherein the first parallel running section and the second parallel running section overlap each other when viewed from the lamination direction.

9. The multilayer coil component according to claim 8 , wherein the second multilayer section is made up of three or more of the coil conductors.

10. 10. The multilayer coil component according to claim 8, wherein the length of all of the coil conductors constituting the second multilayer portion is a length of 3 / 4 turns of the coil.

11. 11. The multilayer coil component according to claim 1, wherein the stacking direction and the direction of the coil axis of the coil are parallel to a mounting surface of the element body along the same direction.

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