Multilayer coil component

Abstract

To provide a multilayer coil component in which defects such as cracks are unlikely to occur in an element body.SOLUTION: A multilayer coil component 1 includes an element body 10A formed by laminating a plurality of insulating layers in a lamination direction, and a coil 30A provided inside the element body. The coil is formed by electrically connecting a plurality of coil conductors Q1 to Q15 laminated in the lamination direction L through via conductors penetrating through the insulating layers in the lamination direction. The plurality of coil conductors includes a first lamination section Ea1 consisting of three or more adjacent coil conductors, a second lamination section Fa1 consisting of the same number of adjacent coil conductors as the first lamination section, and an intermediate section GA1 that consists of one or two coil conductors and is adjacent to both the first lamination section and the second lamination section. The first lamination section has a first parallel section Ma1 in which all the coil conductors constituting the first lamination section overlap one another in the lamination direction, and the second laminate section has a second parallel section Na1 in which all the coil conductors constituting the second lamination section overlap one another in the lamination direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Patent Document 1 discloses a laminated inductor comprising a laminate including a plurality of insulating layers stacked in a stacking direction, and a plurality of coil groups arranged in the laminate along the stacking direction and connected in series, wherein the coil groups include a plurality of coil patterns provided on the insulating layers and stacked in the stacking direction, and are configured by connecting in series a plurality of pattern groups, each of which has n (n is a positive integer) coil patterns connected in parallel, wherein the parallel number n of at least one coil group is different from the parallel number n of the other coil groups, the plurality of insulating layers include magnetic insulating layers and non-magnetic insulating layers, and at least one of the insulating layers adjacent to the coil patterns is a non-magnetic insulating layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-9299 A Summary of the Invention [Problem to be solved by the invention]

[0004] Fig. 12A of Patent Document 1 discloses a multilayer inductor configured by connecting in series a plurality of pattern groups, each of which is made up of three coil patterns connected in parallel. However, the present inventors have found through their investigation that the multilayer inductor shown in Fig. 12A of Patent Document 1 has the following problems.

[0005] In the multilayer inductor shown in Fig. 12A of Patent Document 1, in a combination of pattern groups adjacent in the stacking direction, there is an area in which the coil patterns do not overlap when viewed from the stacking direction, which is three consecutive layers long based on the insulating layer. Therefore, in the multilayer inductor shown in Fig. 12A of Patent Document 1, the density is likely to decrease locally in the above area, resulting in a problem that defects such as cracks are likely to occur in the laminate.

[0006] The present invention has been made to solve the above problems, and has an object to provide a multilayer coil component in which defects such as cracks are less likely to occur in the element body. [Means for solving the problem]

[0007] The laminated coil component of the present invention comprises an element body formed by laminating a plurality of insulating layers in a lamination 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 electrically connecting a plurality of coil conductors laminated in the lamination direction through via conductors that penetrate the insulating layers in the lamination direction, and the plurality of coil conductors laminated in the lamination direction are comprised of a first laminate section consisting of three or more adjacent coil conductors, a second laminate section consisting of the same number of adjacent coil conductors as the first laminate section, and an intermediate laminate section adjacent to both laminate sections between the first laminate section and the second laminate section and consisting of one or two of the coil conductors. 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, and the first parallel running section is connected in parallel by the via conductor; the second laminate section has a second parallel running section in which all of the coil conductors constituting the second laminate section overlap when viewed from the stacking direction, and the second parallel running section is connected in parallel by the via conductor, the first parallel running section and the second parallel running section overlap when viewed from the stacking direction; and all of the coil conductors constituting the intermediate section do not overlap with each portion of the first parallel running section and the second parallel running section when viewed from the stacking direction. Effect of the Invention

[0008] According to the present invention, it is possible to provide a multilayer coil component in which defects such as cracks are unlikely to occur in the element body. [Brief description of the drawings]

[0009] [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 plan 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 (excluding the external electrodes) according to the second embodiment of the present invention, continuing from FIG. [Figure 8] FIG. 8 is a schematic plan 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 (excluding the external electrodes) according to the third embodiment of the present invention, continuing from FIG. [Figure 10] FIG. 10 is a schematic plan view showing an example of an exploded state of the multilayer coil component (excluding the external electrodes) according to the fourth embodiment of the present invention. [Figure 11] FIG. 11 is a schematic plan view showing an example of an exploded state of the multilayer coil component (excluding the external electrodes) according to the fourth embodiment of the present invention, illustrating a portion subsequent to FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 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.

[0011] 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.

[0012] 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."

[0013] The drawings shown below are schematic diagrams, and the dimensions, aspect ratio, and scale may differ from those of the actual product.

[0014] The laminated coil component of the present invention comprises an element body formed by laminating a plurality of insulating layers in a lamination 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 electrically connecting a plurality of coil conductors laminated in the lamination direction through via conductors that penetrate the insulating layers in the lamination direction, and the plurality of coil conductors laminated in the lamination direction are comprised of a first laminate section consisting of three or more adjacent coil conductors, a second laminate section consisting of the same number of adjacent coil conductors as the first laminate section, and an intermediate laminate section adjacent to both laminate sections between the first laminate section and the second laminate section and consisting of one or two of the coil conductors. 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, and the first parallel running section is connected in parallel by the via conductor; the second laminate section has a second parallel running section in which all of the coil conductors constituting the second laminate section overlap when viewed from the stacking direction, and the second parallel running section is connected in parallel by the via conductor, the first parallel running section and the second parallel running section overlap when viewed from the stacking direction; and all of the coil conductors constituting the intermediate section do not overlap with each portion of the first parallel running section and the second parallel running section when viewed from the stacking direction.

[0015] [Embodiment 1] An example of the laminated coil component of the present invention will be described as a laminated coil component according to a first embodiment of the present invention.

[0016] In the multilayer coil component according to the first embodiment of the present invention, each of the first multilayer section and the second multilayer section is made up of three adjacent coil conductors.

[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, insulating layer P14, and insulating layer P15, 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, coil conductor Q14, and coil conductor Q15.

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

[0044] Coil conductor Q1 has land portions Ra1 and Rb1 at separate ends.

[0045] The coil conductor Q2 is L-shaped and is provided on the main surface of the insulating layer P2.

[0046] Coil conductor Q2 has land portion Ra2 and land portion Rc2 at separate ends.

[0047] The land portion Ra2 is connected to a via conductor Sa2 that penetrates the insulating layer P2 in the longitudinal direction L. The via conductor Sa2 is connected to the land portion Ra1 in addition to the land portion Ra2. That is, the land portion Ra1 and the land portion Ra2 are electrically connected through the via conductor Sa2.

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

[0049] 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.

[0050] The coil conductor Q3 is U-shaped and is provided on the main surface of the insulating layer P3.

[0051] Coil conductor Q3 has land portions Ra3 and Rd3 at separate ends.

[0052] 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 land portion Ra2 in addition to the land portion Ra3. That is, the land portion Ra2 and the land portion Ra3 are electrically connected through the via conductor Sa3.

[0053] The coil conductor Q3 has a bent portion Ub3 and a bent portion Uc3.

[0054] 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.

[0055] 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.

[0056] The coil conductor Q4 is U-shaped and is provided on the main surface of the insulating layer P4.

[0057] Coil conductor Q4 has land portion Ra4 and land portion Rb4 at separate ends.

[0058] 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.

[0059] The coil conductor Q4 has a bent portion Uc4 and a bent portion Ud4.

[0060] 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.

[0061] 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.

[0062] The coil conductor Q5 is U-shaped and is provided on the main surface of the insulating layer P5.

[0063] Coil conductor Q5 has land portion Rb5 and land portion Rc5 at separate ends.

[0064] 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.

[0065] The coil conductor Q5 has a bent portion Ua5 and a bent portion Ud5.

[0066] 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.

[0067] 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.

[0068] The coil conductor Q6 is U-shaped and is provided on the main surface of the insulating layer P6.

[0069] Coil conductor Q6 has land portion Rc6 and land portion Rd6 at separate ends.

[0070] 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.

[0071] The coil conductor Q6 has a bent portion Ua6 and a bent portion Ub6.

[0072] 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.

[0073] 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.

[0074] The coil conductor Q7 is U-shaped and is provided on the main surface of the insulating layer P7.

[0075] Coil conductor Q7 has land portion Ra7 and land portion Rd7 at separate ends.

[0076] 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.

[0077] The coil conductor Q7 has a bend Ub7 and a bend Uc7.

[0078] 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.

[0079] 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.

[0080] The coil conductor Q8 is U-shaped and is provided on the main surface of the insulating layer P8.

[0081] Coil conductor Q8 has land portion Ra8 and land portion Rb8 at separate ends.

[0082] 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.

[0083] The coil conductor Q8 has a bent portion Uc8 and a bent portion Ud8.

[0084] 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.

[0085] 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.

[0086] The coil conductor Q9 is U-shaped and is provided on the main surface of the insulating layer P9.

[0087] Coil conductor Q9 has land portion Rb9 and land portion Rc9 at separate ends.

[0088] The land portion Rc9 is connected to a via conductor Sc9 that penetrates the insulating layer P9 in the length direction L. The via conductor Sc9 is connected to the bent portion Uc8 in addition to the land portion Rc9. That is, the bent portion Uc8 and the land portion Rc9 are electrically connected through the via conductor Sc9.

[0089] The coil conductor Q9 has a bent portion Ua9 and a bent portion Ud9.

[0090] 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.

[0091] 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.

[0092] The coil conductor Q10 is U-shaped and is provided on the main surface of the insulating layer P10.

[0093] Coil conductor Q10 has land portion Rc10 and land portion Rd10 at separate ends.

[0094] 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.

[0095] The coil conductor Q10 has a bent portion Ua10 and a bent portion Ub10.

[0096] 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.

[0097] 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.

[0098] The coil conductor Q11 is U-shaped and is provided on the main surface of the insulating layer P11.

[0099] Coil conductor Q11 has land portions Ra11 and Rd11 at separate ends.

[0100] 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.

[0101] The coil conductor Q11 has a bent portion Ub11 and a bent portion Uc11.

[0102] 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.

[0103] 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.

[0104] The coil conductor Q12 is U-shaped and is provided on the main surface of the insulating layer P12.

[0105] Coil conductor Q12 has land portion Ra12 and land portion Rb12 at separate ends.

[0106] 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.

[0107] The coil conductor Q12 has a bent portion Uc12 and a bent portion Ud12.

[0108] 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.

[0109] 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.

[0110] The coil conductor Q13 is U-shaped and is provided on the main surface of the insulating layer P13.

[0111] Coil conductor Q13 has land portion Rb13 and land portion Rc13 at separate ends.

[0112] 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.

[0113] The coil conductor Q13 has a bent portion Ua13 and a bent portion Ud13.

[0114] 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.

[0115] 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.

[0116] The coil conductor Q14 is L-shaped and is provided on the main surface of the insulating layer P14.

[0117] Coil conductor Q14 has land portion Rb14 and land portion Rd14 at separate ends.

[0118] The land portion Rb14 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 land portion Rb14. That is, the land portion Rb13 and the land portion Rb14 are electrically connected through the via conductor Sb14.

[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.

[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 coil conductor Q15 is linear and is provided on the main surface of the insulating layer P15.

[0123] Coil conductor Q15 has land portion Ra15 and land portion Rb15 at separate ends.

[0124] The land portion Ra15 is connected to a via conductor Sa15 that penetrates the insulating layer P15 in the length direction L. The via conductor Sa15 is connected to the bent portion Ua14 in addition to the land portion Ra15. That is, the bent portion Ua14 and the land portion Ra15 are electrically connected through the via conductor Sa15.

[0125] The land portion Rb15 is connected to a via conductor Sb15 that penetrates the insulating layer P15 in the length direction L. The via conductor Sb15 is connected to the land portion Rb14 in addition to the land portion Rb15. That is, the land portion Rb14 and the land portion Rb15 are electrically connected to each other through the via conductor Sb15.

[0126] In this specification, the L-shape may be any shape having two sides that are substantially perpendicular to each other, and does not necessarily have to be a shape having two sides that are strictly perpendicular to each other.

[0127] 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.

[0128] 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, the insulating layer P14, and the insulating layer P15 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, the coil conductor Q14, and the coil conductor Q15 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, thereby forming the coil 30A.

[0129] The coil 30A is, for example, in the form of a solenoid.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] In the multilayer coil component 1, a plurality of coil conductors laminated in the length direction L include a first multilayer portion Ea1, a second multilayer portion Fa1, and a middle portion Ga1.

[0137] The first lamination unit Ea1 is made up of three adjacent coil conductors, namely, a coil conductor Q3, a coil conductor Q4, and a coil conductor Q5.

[0138] 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 Q3, the coil conductor Q4, and the coil conductor Q5, overlap when viewed from the longitudinal direction L.

[0139] In the first parallel section Ma1, the via conductors Sc4, Sd4, Sc5, and Sd5 are connected in parallel, that is, the coil conductors Q3, Q4, and Q5 are connected in parallel in the first parallel section Ma1.

[0140] The coil conductor Q3, the coil conductor Q4, and the coil conductor Q5 do not overlap each other when viewed from the longitudinal direction L, except in the first parallel running section Ma1.

[0141] The second laminate unit Fa1 is made up of three adjacent coil conductors Q7, Q8, and Q9, the same number as the first laminate unit Ea1.

[0142] 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 Q7, the coil conductor Q8, and the coil conductor Q9, overlap when viewed from the longitudinal direction L.

[0143] The second parallel section Na1 is connected in parallel by the via conductor Sc8, the via conductor Sd8, the via conductor Sc9, and the via conductor Sd9. That is, the coil conductor Q7, the coil conductor Q8, and the coil conductor Q9 are connected in parallel in the second parallel section Na1.

[0144] The coil conductor Q7, the coil conductor Q8, and the coil conductor Q9 do not overlap with each other when viewed from the longitudinal direction L, except in the second parallel running section Na1.

[0145] The first parallel running section Ma1 and the second parallel running section Na1 overlap each other when viewed from the longitudinal direction L.

[0146] In the above, the first lamination section Ea1 and the second lamination section Fa1 have been exemplified as lamination sections consisting of three adjacent coil conductors in the laminated coil component 1, but the same applies to lamination sections consisting of other combinations of three adjacent coil conductors. That is, in the laminated 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.

[0147] 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.

[0148] The intermediate portion Ga1 is located between the first laminate portion Ea1 and the second laminate portion Fa1 and adjacent to both laminate portions, and is composed of one coil conductor Q6.

[0149] All of the coil conductors constituting the intermediate portion Ga1, i.e., the coil conductor Q6, do not overlap any part of the first parallel running section Ma1 or the second parallel running section Na1 when viewed in the longitudinal direction L. More specifically, the coil conductor Q6 does not overlap any area (area surrounded by dashed lines) other than both ends of the first parallel running section Ma1 (including the connection portions where the coil conductor and the via conductor are connected) and any area (area surrounded by dashed lines) other than both ends of the second parallel running section Na1 (including the connection portions where the coil conductor and the via conductor are connected) when viewed in the longitudinal direction L.

[0150] Therefore, in the laminated coil component 1, when viewed from the longitudinal direction L, between the first parallel running section Ma1 and the second parallel running section Na1, there is an area where no coil conductor exists, which is only one insulating layer in length.

[0151] In the above, the combination of the first laminated portion Ea1, the second laminated portion Fa1, and the intermediate portion Ga1 in the laminated coil component 1 has been exemplified, but the same applies to other combinations. That is, in the laminated coil component 1, when viewed from the length direction L, there is only one insulating layer-based region in which no coil conductor exists between the first parallel running section and the second parallel running section. Therefore, in the laminated coil component 1, the density is less likely to decrease locally compared to, for example, the laminated inductor shown in FIG. 12A of Patent Document 1. Therefore, in the laminated coil component 1, defects such as cracks are less likely to occur in the element body 10A compared to, for example, the laminated inductor shown in FIG. 12A of Patent Document 1.

[0152] In the multilayer coil component of the present invention, the intermediate portion is preferably made up of one of the coil conductors.

[0153] In the laminated coil component 1, for example, the intermediate section Ga1 is composed of one coil conductor Q6. That is, in the laminated coil component 1, when viewed from the longitudinal direction L, there is only one insulating layer-worth of area where no coil conductor is present between the first parallel section Ma1 and the second parallel section Na1. This satisfactorily prevents local density reduction in the laminated coil component 1.

[0154] In the multilayer coil component of the present invention, the length of all of the coil conductors constituting the first multilayer section, the second multilayer section, and the intermediate section may be a length of 3 / 4 turns of the coil.

[0155] In the laminated coil component 1, for example, the length of all the coil conductors constituting the first laminated portion Ea1, the second laminated portion Fa1, and the intermediate portion Ga1 is equal to the length of ¾ turns of the coil 30A.

[0156] 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.

[0157] The element body 10A further includes an insulating layer Px.

[0158] 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.

[0159] An extension land portion Rax is provided on the main surface of the insulating layer Px. 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 the extension via conductor Sax as well as to an extension via conductor Sa1 penetrating the insulating layer P1 in the length direction L. This forms a first extension conductor 41 consisting of the extension land portion Rax, the extension via conductor Sax, and the extension via conductor Sa1.

[0160] The extension via conductor Sa1 is connected to the land portion Ra1 in addition to the extension land portion Rax. That is, the first extension conductor 41 is connected to the coil 30A.

[0161] 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.

[0162] 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 41 is exposed from the first end surface 11a of the element body 10A. The exposed portion of the first extension conductor 41 is connected to the first external electrode 21 provided on the first end surface 11a of the element body 10A.

[0163] Therefore, the coil 30A and the first external electrode 21 are electrically connected via the first extension conductor 41.

[0164] 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.

[0165] The number of insulating layers Px may be one or more.

[0166] When the insulating layers Px include a plurality of layers, the first extension conductor 41 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.

[0167] The element body 10A further includes an insulating layer Py.

[0168] The insulating layer Py is laminated on the second end face 11b side of the insulating layer P15, that is, on the side of the insulating layer P15 opposite to the insulating layer P14.

[0169] An extension land portion Rby is provided on the main surface of the insulating layer Py. The extension land portion Rby is connected to an extension via conductor Sby that penetrates the insulating layer Py in the length direction L. This forms a second extension conductor 42 consisting of the extension land portion Rby and the extension via conductor Sby.

[0170] The extraction via conductor Sby is connected to the land portion Rby as well as the land portion Rb15. That is, the second extraction conductor 42 is connected to the coil 30A.

[0171] 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.

[0172] 5, the insulating layer Py is laminated on the side of the insulating layer P15 opposite the insulating layer P14, so that the second extension conductor 42 is exposed from the second end face 11b of the element body 10A. The exposed portion of the second extension conductor 42 is connected to the second external electrode 22 provided on the second end face 11b of the element body 10A.

[0173] Therefore, the coil 30A and the second external electrode 22 are electrically connected via the second extension conductor .

[0174] 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.

[0175] The number of insulating layers Py may be one or more.

[0176] When the number of insulating layers Py is multiple, the second extension conductor 42 is formed by alternately connecting a plurality of extension land portions Rby and a plurality of extension via conductors Sby.

[0177] 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.

[0178] The multilayer coil component 1 does not necessarily have to have at least one of the first extension conductor 41 and the second extension conductor .

[0179] 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.

[0180] 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.

[0181] When viewed from the longitudinal direction L, each land portion may be circular or polygonal.

[0182] When viewed from the length direction L, each via conductor may be circular or polygonal.

[0183] When viewed from the length direction L, each of the extraction via conductors may be in a circular shape or a polygonal shape.

[0184] Each of the coil conductors and each of the lead conductors may not independently have a land portion.

[0185] The multilayer coil component 1 is manufactured, for example, by the following method.

[0186] <Magnetic material manufacturing process> First, Fe2O3, ZnO, CuO, and NiO are weighed out to have a predetermined ratio.

[0187] 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.

[0188] 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.

[0189] In this manner, a powdered magnetic material, more specifically, a powdered magnetic ferrite material, is produced.

[0190] The ferrite material is preferably a Ni-Cu-Zn based ferrite material.

[0191] 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.

[0192] The Ni-Cu-Zn based ferrite material may further contain additives such as Co, Bi, Sn, and Mn.

[0193] The Ni-Cu-Zn based ferrite material may further contain inevitable impurities.

[0194] <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.

[0195] 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.

[0196] 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.

[0197] <Conductor pattern formation process> First, a via hole is formed by irradiating a laser onto a predetermined location of a green sheet.

[0198] 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 shown in Figures 2 and 3) connected to the coil conductor shown in Figures 2 and 3 are formed on each coil sheet.

[0199] 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 Figures 2 and 3 and a via conductor conductor pattern corresponding to the lead-out via conductor connected to the lead-out land shown in Figures 2 and 3 (excluding the lead-out via conductor Sa1 shown in Figures 2 and 3) are formed on each via sheet.

[0200] <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.

[0201] <Element and coil manufacturing process> First, the laminate block is cut into individual chips of a predetermined size using a dicer or the like.

[0202] 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.

[0203] 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).

[0204] 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 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.

[0205] In this manner, an element body and a coil provided inside the element body are produced.

[0206] 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 is exposed from a first end face of the element body. The second lead-out conductor is exposed from a second end face of the element body.

[0207] The element body may be subjected to barrel polishing, for example, to round off corners and ridges.

[0208] <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 a first extraction conductor exposed from a first end face of the element body, the first coating film 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.

[0209] In addition, by applying a conductive paste such as a paste containing Ag and glass frit, a second coating film connected to the second 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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 extraction conductor.

[0214] In addition, by baking the second coating film, a second base electrode is formed that 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 second extraction conductor.

[0215] 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.

[0216] The thickness of the first and second base electrodes is, for example, 5 μm.

[0217] 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.

[0218] 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.

[0219] In this way, a first external electrode electrically connected to the coil via the first extension conductor, and a second external electrode electrically connected to the coil via the second extension conductor are formed on the surface of the element body.

[0220] In this manner, the multilayer coil component 1 is manufactured.

[0221] [Embodiment 2] In the multilayer coil component according to the second embodiment of the present invention, each of the first and second multilayer sections is composed of four adjacent coil conductors. Except for this, the multilayer coil component according to the second embodiment of the present invention is similar to the multilayer coil component according to the first embodiment of the present invention.

[0222] Fig. 6 is a schematic plan 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. Fig. 7 is a schematic plan view showing a portion subsequent to Fig. 6, 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.

[0223] In the laminated coil component 2 shown in Figures 6 and 7, the base body 10B is formed by stacking insulating layer Px, insulating layer P1, insulating layer P2, insulating layer P3, insulating layer P16, insulating layer P4, insulating layer P5, insulating layer P6, insulating layer P17, insulating layer P7, insulating layer P8, insulating layer P9, insulating layer P18, insulating layer P10, insulating layer P11, insulating layer P12, insulating layer P19, insulating layer P13, insulating layer P20, insulating layer P21, insulating layer P22, insulating layer P23, insulating layer P24, insulating layer P14, insulating layer P25, insulating layer P15, and insulating layer Py in this order in the longitudinal direction L. In base body 10B, insulating layer P16, insulating layer P17, insulating layer P18, insulating layer P19, insulating layer P20, insulating layer P21, insulating layer P22, insulating layer P23, insulating layer P24, and insulating layer P25 are additionally provided at the positions described above with respect to base body 10A (see Figures 2 and 3).

[0224] A coil 30B is provided inside the element body 10B.

[0225] As shown in Figures 6 and 7, coil conductor 30B includes, in order in the longitudinal direction L, coil conductor Q1, coil conductor Q2, coil conductor Q3, coil conductor Q16, coil conductor Q4, coil conductor Q5, coil conductor Q6, coil conductor Q17, coil conductor Q7, coil conductor Q8, coil conductor Q9, coil conductor Q18, coil conductor Q10, coil conductor Q11, coil conductor Q12, coil conductor Q19, coil conductor Q13, coil conductor Q20, coil conductor Q21, coil conductor Q22, coil conductor Q23, coil conductor Q24, coil conductor Q14, coil conductor Q25, and coil conductor Q15. In coil 30B, coil conductor Q16, coil conductor Q17, coil conductor Q18, coil conductor Q19, coil conductor Q20, coil conductor Q21, coil conductor Q22, coil conductor Q23, coil conductor Q24, and coil conductor Q25 are additionally provided at the positions described above with respect to coil 30A (see Figures 2 and 3).

[0226] The following describes the insulating layers and coil conductors newly provided in the laminated coil component 2. Note that the connection relationship between adjacent coil conductors in the laminated coil component 2 is clear by referring to Figs. 6 and 7 in accordance with the above-mentioned laminated coil component 1, and therefore a description thereof will be omitted.

[0227] The coil conductor Q16 is U-shaped and is provided on the main surface of the insulating layer P16.

[0228] The coil conductor Q16 has a land portion Ra16 and a land portion Rd16 at separate ends, and also has a bend portion Ub16 and a bend portion Uc16.

[0229] The land portion Ra16, the bent portion Ub16, the bent portion Uc16, and the land portion Rd16 are connected to the via conductors Sa16, Sb16, Sc16, and Sd16 that pass through the insulating layer P16 in the length direction L, respectively.

[0230] The coil conductor Q17 is U-shaped and is provided on the main surface of the insulating layer P17.

[0231] The coil conductor Q17 has a land portion Rc17 and a land portion Rd17 at separate ends, and also has a bent portion Ua17 and a bent portion Ub17.

[0232] The bent portion Ua17, the bent portion Ub17, the land portion Rc17, and the land portion Rd17 are connected to the via conductors Sa17, Sb17, Sc17, and Sd17 that pass through the insulating layer P17 in the length direction L, respectively.

[0233] The coil conductor Q18 is U-shaped and is provided on the main surface of the insulating layer P18.

[0234] The coil conductor Q18 has a land portion Rb18 and a land portion Rc18 at separate ends, and also has a bent portion Ua18 and a bent portion Ud18.

[0235] The bent portion Ua18, the land portion Rb18, the land portion Rc18, and the bent portion Ud18 are connected to the via conductors Sa18, Sb18, Sc18, and Sd18, which pass through the insulating layer P18 in the length direction L, respectively.

[0236] The coil conductor Q19 is U-shaped and is provided on the main surface of the insulating layer P19.

[0237] The coil conductor Q19 has a land portion Ra19 and a land portion Rb19 at separate ends, and also has a bend portion Uc19 and a bend portion Ud19.

[0238] The land portion Ra19, the land portion Rb19, the bent portion Uc19, and the bent portion Ud19 are connected to the via conductors Sa19, Sb19, Sc19, and Sd19 that pass through the insulating layer P19 in the length direction L, respectively.

[0239] The coil conductor Q20 is U-shaped and is provided on the main surface of the insulating layer P20.

[0240] The coil conductor Q20 has a land portion Rc20 and a land portion Rd20 at separate ends, and also has a bent portion Ua20 and a bent portion Ub20.

[0241] The bent portion Ua20, the bent portion Ub20, and the land portion Rd20 are connected to the via conductors Sa20, Sb20, and Sd20 that pass through the insulating layer P20 in the length direction L, respectively.

[0242] The coil conductor Q21 is U-shaped and is provided on the main surface of the insulating layer P21.

[0243] The coil conductor Q21 has a land portion Ra21 and a land portion Rd21 at separate ends, and also has a bent portion Ub21 and a bent portion Uc21.

[0244] The land portion Ra21, the bent portion Ub21, and the bent portion Uc21 are connected to the via conductors Sa21, Sb21, and Sc21, which pass through the insulating layer P21 in the length direction L, respectively.

[0245] The coil conductor Q22 is U-shaped and is provided on the main surface of the insulating layer P22.

[0246] The coil conductor Q22 has a land portion Ra22 and a land portion Rd22 at separate ends, and also has a bent portion Ub22 and a bent portion Uc22.

[0247] The land portion Ra22, the bent portion Ub22, the bent portion Uc22, and the land portion Rd22 are connected to the via conductors Sa22, Sb22, Sc22, and Sd22, which pass through the insulating layer P22 in the length direction L, respectively.

[0248] The coil conductor Q23 is U-shaped and is provided on the main surface of the insulating layer P23.

[0249] The coil conductor Q23 has a land portion Ra23 and a land portion Rb23 at separate ends, and also has a bent portion Uc23 and a bent portion Ud23.

[0250] The land portion Rb23, the bent portion Uc23, and the bent portion Ud23 are connected to via conductors Sb23, Sc23, and Sd23, which penetrate the insulating layer P23 in the length direction L, respectively.

[0251] The coil conductor Q24 is U-shaped and is provided on the main surface of the insulating layer P24.

[0252] The coil conductor Q24 has a land portion Rb24 and a land portion Rc24 at separate ends, and also has a bend portion Ua24 and a bend portion Ud24.

[0253] The bent portion Ua24, the land portion Rc24, and the bent portion Ud24 are connected to via conductors Sa24, Sc24, and Sd24, which pass through the insulating layer P24 in the length direction L, respectively.

[0254] The coil conductor Q25 is L-shaped and is provided on the main surface of the insulating layer P25.

[0255] The coil conductor Q25 has a land portion Rb25 and a land portion Rd25 at separate ends, and also has a bent portion Ua25.

[0256] The bent portion Ua25, the land portion Rb25, and the land portion Rd25 are connected to via conductors Sa25, Sb25, and Sd25, which pass through the insulating layer P25 in the length direction L, respectively.

[0257] In the laminated coil component 2, the multiple coil conductors laminated in the length direction L include a first laminate portion Ea2, a second laminate portion Fa2, and a middle portion Ga2.

[0258] The first lamination unit Ea2 is made up of four adjacent coil conductors: a coil conductor Q3, a coil conductor Q16, a coil conductor Q4, and a coil conductor Q5.

[0259] The first laminate portion Ea2 has a first parallel section Ma2 in which all of the coil conductors that constitute the first laminate portion Ea2, i.e., the coil conductor Q3, the coil conductor Q16, the coil conductor Q4, and the coil conductor Q5, overlap when viewed from the longitudinal direction L.

[0260] In the first parallel section Ma2, the via conductor Sc16, the via conductor Sd16, the via conductor Sc4, the via conductor Sd4, the via conductor Sc5, and the via conductor Sd5 are connected in parallel, that is, the coil conductor Q3, the coil conductor Q16, the coil conductor Q4, and the coil conductor Q5 are connected in parallel in the first parallel section Ma2.

[0261] The coil conductor Q3, the coil conductor Q16, the coil conductor Q4, and the coil conductor Q5 do not overlap each other when viewed from the longitudinal direction L, except in the first parallel running section Ma2.

[0262] The second multilayer unit Fa2 is made up of four adjacent coil conductors Q7, Q8, Q9, and Q18, which is the same number as the first multilayer unit Ea2.

[0263] The second laminate portion Fa2 has a second parallel running section Na2 in which all of the coil conductors that constitute the second laminate portion Fa2, i.e., coil conductor Q7, coil conductor Q8, coil conductor Q9, and coil conductor Q18, overlap when viewed from the longitudinal direction L.

[0264] The second parallel section Na2 is connected in parallel by via conductor Sc8, via conductor Sd8, via conductor Sc9, via conductor Sd9, via conductor Sc18, and via conductor Sd18. That is, the coil conductor Q7, coil conductor Q8, coil conductor Q9, and coil conductor Q18 are connected in parallel in the second parallel section Na2.

[0265] The coil conductor Q7, the coil conductor Q8, the coil conductor Q9, and the coil conductor Q18 do not overlap each other when viewed from the longitudinal direction L, except in the second parallel running section Na2.

[0266] The first parallel running section Ma2 and the second parallel running section Na2 overlap each other when viewed in the longitudinal direction L.

[0267] The intermediate portion Ga2 is located between the first laminate portion Ea2 and the second laminate portion Fa2 and adjacent to both laminate portions, and is composed of two coil conductors, a coil conductor Q6 and a coil conductor Q17.

[0268] All of the coil conductors constituting the intermediate portion Ga2, i.e., the coil conductor Q6 and the coil conductor Q17, do not overlap parts of the first parallel running section Ma2 and the second parallel running section Na2 when viewed in the longitudinal direction L. More specifically, the coil conductor Q6 and the coil conductor Q17 do not overlap areas (areas surrounded by dashed lines) other than both ends of the first parallel running section Ma2 (including the connection portions where the coil conductors and the via conductors are connected) and areas (areas surrounded by dashed lines) other than both ends of the second parallel running section Na2 (including the connection portions where the coil conductors and the via conductors are connected) when viewed in the longitudinal direction L.

[0269] Therefore, in the laminated coil component 2, when viewed from the longitudinal direction L, between the first parallel section Ma2 and the second parallel section Na2, there is an area where no coil conductor exists that is only two layers in length, measured based on the insulating layer standard.

[0270] In the laminated coil component 2, the multiple coil conductors laminated in the length direction L include a first laminate portion Eb2, a second laminate portion Fb2, and a middle portion Gb2.

[0271] The first multilayer unit Eb2, like the second multilayer unit Fa2, is made up of four adjacent coil conductors: a coil conductor Q7, a coil conductor Q8, a coil conductor Q9, and a coil conductor Q18.

[0272] The first laminate portion Eb2 has a first parallel section Mb2 in which all of the coil conductors that constitute the first laminate portion Eb2, i.e., coil conductor Q7, coil conductor Q8, coil conductor Q9, and coil conductor Q18, overlap when viewed from the longitudinal direction L.

[0273] The first parallel running section Mb2 is connected in parallel by via conductor Sc8, via conductor Sd8, via conductor Sc9, via conductor Sd9, via conductor Sc18, and via conductor Sd18. That is, the coil conductor Q7, coil conductor Q8, coil conductor Q9, and coil conductor Q18 are connected in parallel in the first parallel running section Mb2.

[0274] The coil conductor Q7, the coil conductor Q8, the coil conductor Q9, and the coil conductor Q18 do not overlap each other when viewed from the longitudinal direction L, except in the first parallel running section Mb2.

[0275] The second multilayer unit Fb2 is made up of four adjacent coil conductors Q11, Q12, Q19, and Q13, which is the same number as the first multilayer unit Eb2.

[0276] The second laminate portion Fb2 has a second parallel running section Nb2 in which all of the coil conductors that constitute the second laminate portion Fb2, i.e., coil conductor Q11, coil conductor Q12, coil conductor Q19, and coil conductor Q13, overlap when viewed from the longitudinal direction L.

[0277] The second parallel running section Nb2 is connected in parallel by the via conductor Sc12, the via conductor Sd12, the via conductor Sc19, the via conductor Sd19, the via conductor Sc13, and the via conductor Sd13. That is, the coil conductor Q11, the coil conductor Q12, the coil conductor Q19, and the coil conductor Q13 are connected in parallel in the second parallel running section Nb2.

[0278] The coil conductor Q11, the coil conductor Q12, the coil conductor Q19, and the coil conductor Q13 do not overlap each other when viewed from the longitudinal direction L, except in the second parallel running section Nb2.

[0279] The first parallel running section Mb2 and the second parallel running section Nb2 overlap each other when viewed in the longitudinal direction L.

[0280] The intermediate portion Gb2 is located between the first laminate portion Eb2 and the second laminate portion Fb2 and adjacent to both laminate portions, and is composed of one coil conductor Q10.

[0281] All of the coil conductors constituting the intermediate portion Gb2, i.e., the coil conductor Q10, do not overlap any part of the first parallel running section Mb2 or the second parallel running section Nb2 when viewed in the longitudinal direction L. More specifically, the coil conductor Q10 does not overlap any area (area surrounded by dashed lines) other than both ends of the first parallel running section Mb2 (including the connection portions where the coil conductor and the via conductor are connected) and any area (area surrounded by dashed lines) other than both ends of the second parallel running section Nb2 (including the connection portions where the coil conductor and the via conductor are connected) when viewed in the longitudinal direction L.

[0282] Therefore, in the laminated coil component 2, when viewed from the longitudinal direction L, between the first parallel running section Mb2 and the second parallel running section Nb2, there is an area where no coil conductor exists, which is only one insulating layer in length.

[0283] In the above, the first lamination portion Ea2, the first lamination portion Eb2, the second lamination portion Fa2, and the second lamination portion Fb2 have been exemplified as lamination portions consisting of four adjacent coil conductors in the laminated coil component 2, but the same applies to lamination portions consisting of other combinations of four adjacent coil conductors. In other words, in the laminated coil component 2, the four adjacent coil conductors are connected in parallel in parallel running sections where these coil conductors overlap when viewed from the longitudinal direction L.

[0284] In the above, the combination of the first laminate portion Ea2, the second laminate portion Fa2, and the intermediate portion Ga2 and the combination of the first laminate portion Eb2, the second laminate portion Fb2, and the intermediate portion Gb2 in the laminated coil component 2 have been exemplified, but the same is true for other combinations. That is, in the laminated coil component 2, when viewed from the length direction L, there is only one or two insulating layer-based regions in which no coil conductor exists between the first parallel running section and the second parallel running section. Therefore, in the laminated coil component 2, the density is unlikely to decrease locally, and as a result, defects such as cracks are unlikely to occur in the element body 10B.

[0285] The laminated coil component 2 is manufactured in the same manner as the laminated coil component 1, except that, for example, in a <conductor pattern forming 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 sheets and via sheets, and further, in a <laminate block manufacturing process>, the coil sheets and via sheets are laminated in the stacking direction (length direction L in Figs. 6 and 7) in the order corresponding to Figs. 6 and 7.

[0286] [Embodiment 3] In the multilayer coil component according to the third embodiment of the present invention, each of the first and second multilayer sections is composed of five adjacent coil conductors. Except for this, the multilayer coil component according to the third embodiment of the present invention is similar to the multilayer coil component according to the first embodiment of the present invention.

[0287] Fig. 8 is a schematic plan 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. Fig. 9 is a schematic plan view showing a portion subsequent to Fig. 8, 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.

[0288] In the laminated coil component 3 shown in Figures 8 and 9, the base body 10C is formed by stacking insulating layer Px, insulating layer P1, insulating layer P2, insulating layer P26, insulating layer P3, insulating layer P16, insulating layer P4, insulating layer P5, insulating layer P27, insulating layer P6, insulating layer P17, insulating layer P7, insulating layer P8, insulating layer P28, insulating layer P9, insulating layer P18, insulating layer P10, insulating layer P11, insulating layer P29, insulating layer P12, insulating layer P19, insulating layer P13, insulating layer P20, insulating layer P30, insulating layer P21, insulating layer P22, insulating layer P23, insulating layer P24, insulating layer P31, insulating layer P14, insulating layer P25, insulating layer P15, and insulating layer Py in this order in the longitudinal direction L. In element body 10C, insulating layer P26, insulating layer P27, insulating layer P28, insulating layer P29, insulating layer P30, and insulating layer P31 are additionally provided at the positions described above compared to element body 10B.

[0289] A coil 30C is provided inside the element body 10C.

[0290] As shown in Figures 8 and 9, coil conductor 30C includes, in order in the longitudinal direction L, coil conductor Q1, coil conductor Q2, coil conductor Q26, coil conductor Q3, coil conductor Q16, coil conductor Q4, coil conductor Q5, coil conductor Q27, coil conductor Q6, coil conductor Q17, coil conductor Q7, coil conductor Q8, coil conductor Q28, coil conductor Q9, coil conductor Q18, coil conductor Q10, coil conductor Q11, coil conductor Q29, coil conductor Q12, coil conductor Q19, coil conductor Q13, coil conductor Q20, coil conductor Q30, coil conductor Q21, coil conductor Q22, coil conductor Q23, coil conductor Q24, coil conductor Q31, coil conductor Q14, coil conductor Q25, and coil conductor Q15. In the coil 30C, compared to the coil 30B, a coil conductor Q26, a coil conductor Q27, a coil conductor Q28, a coil conductor Q29, a coil conductor Q30, and a coil conductor Q31 are additionally provided at the positions described above.

[0291] The following describes the insulating layers and coil conductors newly provided in the laminated coil component 3. Note that the connection relationship between adjacent coil conductors in the laminated coil component 3 is clear by referring to Fig. 8 and Fig. 9 in accordance with the above-mentioned laminated coil component 1, and therefore a description thereof will be omitted.

[0292] The coil conductor Q26 is L-shaped and is provided on the main surface of the insulating layer P26.

[0293] The coil conductor Q26 has a land portion Ra26 and a land portion Rc26 at separate ends, and also has a bent portion Ub26.

[0294] The land portion Ra26, the bent portion Ub26, and the land portion Rc26 are connected to via conductors Sa26, Sb26, and Sc26, which pass through the insulating layer P26 in the length direction L, respectively.

[0295] The coil conductor Q27 is U-shaped and is provided on the main surface of the insulating layer P27.

[0296] The coil conductor Q27 has a land portion Rb27 and a land portion Rc27 at separate ends, and also has a bent portion Ua27 and a bent portion Ud27.

[0297] The bent portion Ua27, the land portion Rb27, the land portion Rc27, and the bent portion Ud27 are connected to the via conductors Sa27, Sb27, Sc27, and Sd27 that pass through the insulating layer P27 in the length direction L, respectively.

[0298] The coil conductor Q28 is U-shaped and is provided on the main surface of the insulating layer P28.

[0299] The coil conductor Q28 has a land portion Ra28 and a land portion Rb28 at separate ends, and also has a bend Uc28 and a bend Ud28.

[0300] The land portion Ra28, the land portion Rb28, the bent portion Uc28, and the bent portion Ud28 are connected to the via conductors Sa28, Sb28, Sc28, and Sd28, which pass through the insulating layer P28 in the length direction L, respectively.

[0301] The coil conductor Q29 is U-shaped and is provided on the main surface of the insulating layer P29.

[0302] The coil conductor Q29 has a land portion Ra29 and a land portion Rd29 at separate ends, and also has a bend portion Ub29 and a bend portion Uc29.

[0303] The land portion Ra29, the bent portion Ub29, the bent portion Uc29, and the land portion Rd29 are connected to the via conductors Sa29, Sb29, Sc29, and Sd29 that pass through the insulating layer P29 in the length direction L, respectively.

[0304] The coil conductor Q30 is U-shaped and is provided on the main surface of the insulating layer P30.

[0305] The coil conductor Q30 has a land portion Rc30 and a land portion Rd30 at separate ends, and also has a bent portion Ua30 and a bent portion Ub30.

[0306] The bent portion Ua30, the bent portion Ub30, the land portion Rc30, and the land portion Rd30 are connected to the via conductors Sa30, Sb30, Sc30, and Sd30 that pass through the insulating layer P30 in the length direction L, respectively.

[0307] The coil conductor Q31 is U-shaped and is provided on the main surface of the insulating layer P31.

[0308] The coil conductor Q31 has a land portion Rb31 and a land portion Rc31 at separate ends, and also has a bent portion Ua31 and a bent portion Ud31.

[0309] The bent portion Ua31, the land portion Rb31, the land portion Rc31, and the bent portion Ud31 are connected to the via conductors Sa31, Sb31, Sc31, and Sd31, which pass through the insulating layer P31 in the length direction L, respectively.

[0310] In the laminated coil component 3, the multiple coil conductors laminated in the length direction L include a first laminate portion Ea3, a second laminate portion Fa3, and a middle portion Ga3.

[0311] The first lamination unit Ea3 is made up of five adjacent coil conductors: a coil conductor Q3, a coil conductor Q16, a coil conductor Q4, a coil conductor Q5, and a coil conductor Q27.

[0312] The first laminate portion Ea3 has a first parallel section Ma3 in which all of the coil conductors that constitute the first laminate portion Ea3, i.e., coil conductor Q3, coil conductor Q16, coil conductor Q4, coil conductor Q5, and coil conductor Q27, overlap when viewed from the longitudinal direction L.

[0313] The first parallel section Ma3 is connected in parallel by via conductor Sc16, via conductor Sd16, via conductor Sc4, via conductor Sd4, via conductor Sc5, via conductor Sd5, via conductor Sc27, and via conductor Sd27. That is, the coil conductor Q3, coil conductor Q16, coil conductor Q4, coil conductor Q5, and coil conductor Q27 are connected in parallel in the first parallel section Ma3.

[0314] The coil conductor Q3, the coil conductor Q16, the coil conductor Q4, the coil conductor Q5, and the coil conductor Q27 do not overlap each other when viewed from the longitudinal direction L, except in the first parallel running section Ma3.

[0315] The second multilayer unit Fa3 is composed of five adjacent coil conductors Q7, Q8, Q28, Q9, and Q18, which is the same number as the first multilayer unit Ea3.

[0316] The second laminate portion Fa3 has a second parallel section Na3 in which all of the coil conductors that constitute the second laminate portion Fa3, i.e., coil conductor Q7, coil conductor Q8, coil conductor Q28, coil conductor Q9, and coil conductor Q18, overlap when viewed from the longitudinal direction L.

[0317] The second parallel section Na3 is connected in parallel by via conductor Sc8, via conductor Sd8, via conductor Sc28, via conductor Sd28, via conductor Sc9, via conductor Sd9, via conductor Sc18, and via conductor Sd18. That is, the coil conductor Q7, coil conductor Q8, coil conductor Q28, coil conductor Q9, and coil conductor Q18 are connected in parallel in the second parallel section Na3.

[0318] The coil conductor Q7, the coil conductor Q8, the coil conductor Q28, the coil conductor Q9, and the coil conductor Q18 do not overlap each other when viewed from the longitudinal direction L, except in the second parallel running section Na3.

[0319] The first parallel running section Ma3 and the second parallel running section Na3 overlap each other when viewed from the longitudinal direction L.

[0320] The intermediate portion Ga3 is located between the first laminate portion Ea3 and the second laminate portion Fa3 and adjacent to both laminate portions, and is composed of two coil conductors, a coil conductor Q6 and a coil conductor Q17.

[0321] All of the coil conductors constituting the intermediate portion Ga3, i.e., the coil conductor Q6 and the coil conductor Q17, do not overlap parts of the first parallel running section Ma3 and the second parallel running section Na3 when viewed in the longitudinal direction L. More specifically, the coil conductor Q6 and the coil conductor Q17 do not overlap areas (areas surrounded by dashed lines) other than both ends of the first parallel running section Ma3 (including connection portions where the coil conductors and the via conductors are connected) and areas (areas surrounded by dashed lines) other than both ends of the second parallel running section Na3 (including connection portions where the coil conductors and the via conductors are connected) when viewed in the longitudinal direction L.

[0322] Therefore, in the laminated coil component 3, when viewed from the longitudinal direction L, between the first parallel running section Ma3 and the second parallel running section Na3, there is an area where no coil conductor exists that is only two layers in length, measured based on the insulating layer standard.

[0323] In the laminated coil component 3, the multiple coil conductors laminated in the length direction L include a first laminate portion Eb3, a second laminate portion Fb3, and a middle portion Gb3.

[0324] The first multilayer unit Eb3, like the second multilayer unit Fa3, is made up of five adjacent coil conductors: a coil conductor Q7, a coil conductor Q8, a coil conductor Q28, a coil conductor Q9, and a coil conductor Q18.

[0325] The first laminate portion Eb3 has a first parallel section Mb3 in which all of the coil conductors that constitute the first laminate portion Eb3, i.e., coil conductor Q7, coil conductor Q8, coil conductor Q28, coil conductor Q9, and coil conductor Q18, overlap when viewed from the longitudinal direction L.

[0326] The first parallel running section Mb3 is connected in parallel by via conductor Sc8, via conductor Sd8, via conductor Sc28, via conductor Sd28, via conductor Sc9, via conductor Sd9, via conductor Sc18, and via conductor Sd18. That is, the coil conductor Q7, coil conductor Q8, coil conductor Q28, coil conductor Q9, and coil conductor Q18 are connected in parallel in the first parallel running section Mb3.

[0327] The coil conductor Q7, the coil conductor Q8, the coil conductor Q28, the coil conductor Q9, and the coil conductor Q18 do not overlap each other when viewed from the longitudinal direction L, except in the first parallel running section Mb3.

[0328] The second multilayer unit Fb3 is composed of five adjacent coil conductors, the same number as the first multilayer unit Eb3, that is, a coil conductor Q11, a coil conductor Q29, a coil conductor Q12, a coil conductor Q19, and a coil conductor Q13.

[0329] The second laminate portion Fb3 has a second parallel section Nb3 in which all of the coil conductors that constitute the second laminate portion Fb3, i.e., coil conductor Q11, coil conductor Q29, coil conductor Q12, coil conductor Q19, and coil conductor Q13, overlap when viewed from the longitudinal direction L.

[0330] The second parallel running section Nb3 is connected in parallel by via conductor Sc29, via conductor Sd29, via conductor Sc12, via conductor Sd12, via conductor Sc19, via conductor Sd19, via conductor Sc13, and via conductor Sd13. That is, the coil conductor Q11, coil conductor Q29, coil conductor Q12, coil conductor Q19, and coil conductor Q13 are connected in parallel in the second parallel running section Nb3.

[0331] The coil conductor Q11, the coil conductor Q29, the coil conductor Q12, the coil conductor Q19, and the coil conductor Q13 do not overlap each other when viewed from the longitudinal direction L, except in the second parallel running section Nb3.

[0332] The first parallel running section Mb3 and the second parallel running section Nb3 overlap each other when viewed in the longitudinal direction L.

[0333] The intermediate portion Gb3 is located between the first laminate portion Eb3 and the second laminate portion Fb3 and adjacent to both laminate portions, and is composed of one coil conductor Q10.

[0334] All of the coil conductors constituting the intermediate portion Gb3, i.e., the coil conductor Q10, do not overlap any part of the first parallel running section Mb3 or the second parallel running section Nb3 when viewed in the longitudinal direction L. More specifically, the coil conductor Q10 does not overlap any area (area surrounded by dashed lines) other than both ends of the first parallel running section Mb3 (including the connection portions where the coil conductor and the via conductor are connected) and any area (area surrounded by dashed lines) other than both ends of the second parallel running section Nb3 (including the connection portions where the coil conductor and the via conductor are connected) when viewed in the longitudinal direction L.

[0335] Therefore, in the laminated coil component 3, when viewed from the longitudinal direction L, between the first parallel running section Mb3 and the second parallel running section Nb3, there is an area where no coil conductor exists, which is only one insulating layer in length.

[0336] In the above, the first lamination portion Ea3, the first lamination portion Eb3, the second lamination portion Fa3, and the second lamination portion Fb3 have been exemplified as lamination portions consisting of five adjacent coil conductors in the multilayer coil component 3, but the same applies to lamination portions consisting of other combinations of five adjacent coil conductors. In other words, in the multilayer coil component 3, the five adjacent coil conductors are connected in parallel in parallel running sections where these coil conductors overlap when viewed from the longitudinal direction L.

[0337] In the above, the combination of the first laminate portion Ea3, the second laminate portion Fa3, and the intermediate portion Ga3 and the combination of the first laminate portion Eb3, the second laminate portion Fb3, and the intermediate portion Gb3 in the laminate coil component 3 have been exemplified, but the same is true for other combinations. That is, in the laminate coil component 3, when viewed from the length direction L, there is only one or two insulating layer-based regions in which the coil conductor is not present between the first parallel running section and the second parallel running section. Therefore, in the laminate coil component 3, the density is unlikely to decrease locally, and as a result, defects such as cracks are unlikely to occur in the element body 10C.

[0338] The laminated coil component 3 is manufactured in the same manner as the laminated coil component 1, except that, for example, in a <conductor pattern forming 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 in the coil sheets and via sheets, and further, in a <laminate block manufacturing process>, the coil sheets and via sheets are laminated in the stacking direction (length direction L in FIGS. 8 and 9) in the order corresponding to FIGS.

[0339] [Embodiment 4] In the multilayer coil component according to the fourth embodiment of the present invention, each of the first and second multilayer sections is composed of six adjacent coil conductors. Except for this, the multilayer coil component according to the fourth embodiment of the present invention is similar to the multilayer coil component according to the first embodiment of the present invention.

[0340] Fig. 10 is a schematic plan view showing an example of an exploded state of the multilayer coil component (excluding external electrodes) according to embodiment 4 of the present invention. Fig. 11 is a schematic plan view showing a portion subsequent to Fig. 10, showing an example of an exploded state of the multilayer coil component (excluding external electrodes) according to embodiment 4 of the present invention.

[0341] In the laminated coil component 4 shown in Figures 10 and 11, the base body 10D is formed by stacking insulating layer Px, insulating layer P1, insulating layer P32, insulating layer P2, insulating layer P26, insulating layer P3, insulating layer P16, insulating layer P4, insulating layer P33, insulating layer P5, insulating layer P27, insulating layer P6, insulating layer P17, insulating layer P7, insulating layer P34, insulating layer P8, insulating layer P28, insulating layer P9, insulating layer P18, insulating layer P14, insulating layer P25, insulating layer P35, insulating layer P15, and insulating layer Py in order in the longitudinal direction L. In base body 10D, insulating layer P10, insulating layer P11, insulating layer P29, insulating layer P12, insulating layer P19, insulating layer P13, insulating layer P20, insulating layer P30, insulating layer P21, insulating layer P22, insulating layer P23, insulating layer P24, and insulating layer P31 are removed from base body 10C, and insulating layer P32, insulating layer P33, insulating layer P34, and insulating layer P35 are additionally provided at the above-mentioned positions.

[0342] A coil 30D is provided inside the element body 10D.

[0343] As shown in Figures 10 and 11, coil 30D includes, in order in the longitudinal direction L, coil conductor Q1, coil conductor Q32, coil conductor Q2, coil conductor Q26, coil conductor Q3, coil conductor Q16, coil conductor Q4, coil conductor Q33, coil conductor Q5, coil conductor Q27, coil conductor Q6, coil conductor Q17, coil conductor Q7, coil conductor Q34, coil conductor Q8, coil conductor Q28, coil conductor Q9, coil conductor Q18, coil conductor Q14, coil conductor Q25, coil conductor Q35, and coil conductor Q15. In coil 30D, compared to coil 30C, coil conductor Q10, coil conductor Q11, coil conductor Q29, coil conductor Q12, coil conductor Q19, coil conductor Q13, coil conductor Q20, coil conductor Q30, coil conductor Q21, coil conductor Q22, coil conductor Q23, coil conductor Q24, and coil conductor Q31 are removed, and coil conductor Q32, coil conductor Q33, coil conductor Q34, and coil conductor Q35 are additionally provided in the above-mentioned positions.

[0344] The following describes the insulating layers and coil conductors newly provided in the laminated coil component 4. Note that the connection relationship between adjacent coil conductors in the laminated coil component 4 is clear by referring to Figs. 10 and 11 in accordance with the above-mentioned laminated coil component 1, and therefore a description thereof will be omitted.

[0345] The coil conductor Q32 is linear and is provided on the main surface of the insulating layer P32.

[0346] Coil conductor Q32 has land portion Ra32 and land portion Rb32 at separate ends.

[0347] The land portion Ra32 and the land portion Rb32 are connected to via conductors Sa32 and Sb32 that pass through the insulating layer P32 in the length direction L, respectively.

[0348] The coil conductor Q33 is U-shaped and is provided on the main surface of the insulating layer P33.

[0349] The coil conductor Q33 has a land portion Ra33 and a land portion Rb33 at separate ends, and also has a bent portion Uc33 and a bent portion Ud33.

[0350] The land portion Ra33, the land portion Rb33, the bent portion Uc33, and the bent portion Ud33 are connected to the via conductors Sa33, Sb33, Sc33, and Sd33 that pass through the insulating layer P33 in the length direction L, respectively.

[0351] The coil conductor Q34 is U-shaped and is provided on the main surface of the insulating layer P34.

[0352] The coil conductor Q34 has a land portion Ra34 and a land portion Rd34 at separate ends, and also has a bend portion Ub34 and a bend portion Uc34.

[0353] The land portion Ra34, the bent portion Ub34, the bent portion Uc34, and the land portion Rd34 are connected to the via conductors Sa34, Sb34, Sc34, and Sd34, which pass through the insulating layer P34 in the length direction L, respectively.

[0354] The coil conductor Q35 is linear and is provided on the main surface of the insulating layer P35.

[0355] Coil conductor Q35 has land portion Ra35 and land portion Rb35 at separate ends.

[0356] The land portion Ra35 and the land portion Rb35 are connected to a via conductor Sa35 and a via conductor Sb35 that pass through the insulating layer P35 in the length direction L, respectively.

[0357] In the laminated coil component 4, the multiple coil conductors laminated in the length direction L include a first laminate portion Ea4, a second laminate portion Fa4, and a middle portion Ga4.

[0358] The first lamination portion Ea4 is composed of six adjacent coil conductors: a coil conductor Q3, a coil conductor Q16, a coil conductor Q4, a coil conductor Q33, a coil conductor Q5, and a coil conductor Q27.

[0359] The first laminate portion Ea4 has a first parallel section Ma4 in which all of the coil conductors that constitute the first laminate portion Ea4, i.e., coil conductor Q3, coil conductor Q16, coil conductor Q4, coil conductor Q33, coil conductor Q5, and coil conductor Q27, overlap when viewed from the longitudinal direction L.

[0360] The first parallel section Ma4 is connected in parallel by via conductor Sc16, via conductor Sd16, via conductor Sc4, via conductor Sd4, via conductor Sc33, via conductor Sd33, via conductor Sc5, via conductor Sd5, via conductor Sc27, and via conductor Sd27. That is, the coil conductor Q3, coil conductor Q16, coil conductor Q4, coil conductor Q33, coil conductor Q5, and coil conductor Q27 are connected in parallel in the first parallel section Ma4.

[0361] The coil conductor Q3, the coil conductor Q16, the coil conductor Q4, the coil conductor Q33, the coil conductor Q5, and the coil conductor Q27 do not overlap each other when viewed from the longitudinal direction L, except in the first parallel running section Ma4.

[0362] The second multilayer unit Fa4 is composed of six adjacent coil conductors, the same number as the first multilayer unit Ea4, namely, a coil conductor Q7, a coil conductor Q34, a coil conductor Q8, a coil conductor Q28, a coil conductor Q9, and a coil conductor Q18.

[0363] The second laminate portion Fa4 has a second parallel section Na4 in which all of the coil conductors that constitute the second laminate portion Fa4, i.e., coil conductor Q7, coil conductor Q34, coil conductor Q8, coil conductor Q28, coil conductor Q9, and coil conductor Q18, overlap when viewed from the longitudinal direction L.

[0364] The second parallel section Na4 is connected in parallel by via conductor Sc34, via conductor Sd34, via conductor Sc8, via conductor Sd8, via conductor Sc28, via conductor Sd28, via conductor Sc9, via conductor Sd9, via conductor Sc18, and via conductor Sd18. That is, the coil conductor Q7, coil conductor Q34, coil conductor Q8, coil conductor Q28, coil conductor Q9, and coil conductor Q18 are connected in parallel in the second parallel section Na4.

[0365] The coil conductor Q7, coil conductor Q34, coil conductor Q8, coil conductor Q28, coil conductor Q9, and coil conductor Q18 do not overlap each other when viewed from the longitudinal direction L, except in the second parallel running section Na4.

[0366] The first parallel running section Ma4 and the second parallel running section Na4 overlap each other when viewed in the longitudinal direction L.

[0367] The intermediate portion Ga4 is located between the first laminate portion Ea4 and the second laminate portion Fa4 and adjacent to both laminate portions, and is composed of two coil conductors, a coil conductor Q6 and a coil conductor Q17.

[0368] All of the coil conductors constituting the intermediate portion Ga4, i.e., the coil conductor Q6 and the coil conductor Q17, do not overlap parts of the first parallel running section Ma4 and the second parallel running section Na4 when viewed in the longitudinal direction L. More specifically, the coil conductor Q6 and the coil conductor Q17 do not overlap areas (areas surrounded by dashed lines) other than both ends of the first parallel running section Ma4 (including the connection portions where the coil conductors and the via conductors are connected) and areas (areas surrounded by dashed lines) other than both ends of the second parallel running section Na4 (including the connection portions where the coil conductors and the via conductors are connected) when viewed in the longitudinal direction L.

[0369] Therefore, in the laminated coil component 4, when viewed from the longitudinal direction L, between the first parallel section Ma4 and the second parallel section Na4, there is an area where no coil conductor exists that is only two layers long, measured based on the insulating layer standard.

[0370] In the above, the first multilayer section Ea4 and the second multilayer section Fa4 have been exemplified as multilayer sections consisting of six adjacent coil conductors in the multilayer coil component 4, but the same applies to multilayer sections consisting of other combinations of six adjacent coil conductors. That is, in the multilayer coil component 4, the six adjacent coil conductors are connected in parallel in parallel running sections where these coil conductors overlap when viewed from the longitudinal direction L.

[0371] In the above, the combination of the first laminate portion Ea4, the second laminate portion Fa4, and the intermediate portion Ga4 in the laminated coil component 4 has been exemplified, but the same applies to other combinations. That is, in the laminated coil component 4, when viewed from the length direction L, there is only a region where no coil conductor exists between the first parallel running section and the second parallel running section, which is equivalent to two insulating layers. Therefore, in the laminated coil component 4, the density is unlikely to decrease locally, and as a result, defects such as cracks are unlikely to occur in the element body 10D.

[0372] The laminated coil component 4 is manufactured in the same manner as the laminated coil component 1, except that, for example, in a <conductor pattern forming process>, conductor patterns corresponding to the coil conductors, via conductors, lead-out land portions, and lead-out via conductors shown in Figs. 10 and 11 are formed on the coil sheets and via sheets, and further, in a <laminate block manufacturing process>, the coil sheets and via sheets are laminated in the stacking direction (length direction L in Figs. 10 and 11) in the order corresponding to Figs. 10 and 11.

[0373] In the above embodiments, examples have been given of the number of coil conductors connected in parallel in each of the first and second parallel running sections being three, four, five, and six, but the same applies to the number of coil conductors connected in parallel in each of the first and second parallel running sections being seven or more. EXAMPLES

[0374] 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.

[0375] [Example 1] As the laminated coil component of Example 1, the laminated coil component of Embodiment 1 was manufactured by the following method.

[0376] <Magnetic material manufacturing process> First, Fe2O3, ZnO, CuO, and NiO were weighed out to have a predetermined ratio.

[0377] Next, these weighed materials and pure water were mixed in a ball mill together with PSZ media and then pulverized. The mixing and pulverization time was 6 hours.

[0378] The resulting pulverized material was dried and then calcined at a temperature of 800° C. for a period of 3 hours.

[0379] In this manner, a powdered magnetic material, more specifically, a powdered magnetic ferrite material, was produced.

[0380] <Green sheet manufacturing process> First, the magnetic material, a polyvinyl butyral resin as an organic binder, ethanol and toluene as organic solvents, and a plasticizer were mixed in a ball mill together with PSZ media, and then pulverized to prepare a slurry.

[0381] Next, the slurry was formed into a sheet by a doctor blade method, and then punched out to produce a green sheet. The thickness of the green sheet was set to 25 μm. The shape of the green sheet was set to a rectangular shape.

[0382] <Conductor pattern formation process> First, a via hole was formed by irradiating a laser onto a predetermined location of the green sheet.

[0383] Next, Ag paste was applied to the surface of the green sheet by screen printing while filling the via holes. As a result, the conductor pattern for the via conductor was formed in the via holes of the green sheet, and the conductor pattern for the coil conductor connected to the conductor pattern for the via conductor was formed on the surface. In this way, a coil sheet was produced in which the conductor pattern for the coil conductor and the conductor pattern for the via conductor were formed on the green sheet. A plurality of coil sheets were produced, and the conductor pattern for the coil conductor corresponding to the coil conductor shown in Figures 2 and 3 and the conductor pattern for the via conductor corresponding to the via conductor connected to the coil conductor shown in Figures 2 and 3 (including the lead-out via conductor Sa1 shown in Figures 2 and 3) were formed on each coil sheet.

[0384] In addition, the Ag paste was applied to the surface of the green sheet by screen printing while filling the via holes. As a result, the via conductor conductor pattern was formed in the via hole of the green sheet, and the land conductor pattern connected to the via conductor conductor pattern was formed on the surface. In this way, a via sheet in which the land conductor pattern and the via conductor conductor pattern were formed on the green sheet was produced separately from the coil sheet. A plurality of via sheets were also produced, and a land conductor pattern corresponding to the lead land constituting the lead conductor shown in Figures 2 and 3 and a via conductor conductor pattern corresponding to the lead via conductor connected to the lead land shown in Figures 2 and 3 (excluding the lead via conductor Sa1 shown in Figures 2 and 3) were formed on each via sheet.

[0385] <Laminated block manufacturing process> The coil sheets and via sheets were laminated 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.

[0386] <Element and coil manufacturing process> First, the laminate block was cut into pieces of a predetermined size using a dicer to produce individual chips.

[0387] Next, the individual chips were sintered at a sintering temperature of 900° C. for a sintering time of 3 hours.

[0388] When the individual chips were fired, the coil sheet and via sheet green sheets became insulating layers, resulting in the production of an element body in which multiple insulating layers were stacked in the stacking direction (length direction L in Figures 2 and 3).

[0389] When the individual chips were fired, the conductor patterns for the coil conductors and the conductor patterns for the via conductors of the coil sheet became coil conductors and via conductors (including the lead-out via conductors Sa1 shown in Figs. 2 and 3), respectively. As a result, a coil was produced in which a plurality of coil conductors stacked in the stacking direction (length direction L in Figs. 2 and 3) were electrically connected via the via conductors.

[0390] In this manner, an element body and a coil provided inside the element body were produced.

[0391] On the other hand, when the individual chips were fired, the land conductive pattern and the via conductor conductive pattern of the via sheet became lead-out land portions and lead-out via conductors, respectively. As a result, a first lead-out conductor and a second lead-out conductor were produced, in which a plurality of lead-out land portions and a plurality of lead-out via conductors stacked in the stacking direction (length direction L in Figures 2 and 3) were alternately connected. The first lead-out conductor was exposed from a first end face of the element body. The second lead-out conductor was exposed from a second end face of the element body.

[0392] The element was then placed together with media in a rotary barrel machine and barrel polished to give rounded corners and ridges.

[0393] <External electrode formation process> First, a conductive paste containing Ag and glass frit was applied to form a first coating film connected to a first extraction conductor exposed from a first end face of the element body, the first coating film 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.

[0394] In addition, by applying a conductive paste containing Ag and glass frit, a second coating film connected to the second extraction conductor exposed from the second end face of the element body was 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.

[0395] In this manner, the first coating film and the second coating film were formed at positions spaced apart from each other on the surface of the element body.

[0396] Next, a first coating film was baked to form a first base electrode extending 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 connected to the first extraction conductor.

[0397] In addition, by baking the second coating film, a second base electrode was formed, extending from the second end face of the element body over portions of the first principal surface, the second principal surface, the first side surface, and the second side surface, and connected to the second extraction conductor.

[0398] The baking temperature for the first and second coating films was 800°C.

[0399] The thickness of the first and second base electrodes was set to 5 μm.

[0400] Then, a Ni-plated electrode and a Sn-plated electrode were formed in this order on the surface of the first base electrode by electrolytic plating, thereby forming 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.

[0401] Furthermore, a Ni-plated electrode and a Sn-plated electrode were formed in this order on the surface of the second base electrode by electrolytic plating, thereby forming 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.

[0402] In this way, a first external electrode electrically connected to the coil via the first extension conductor, and a second external electrode electrically connected to the coil via the second extension conductor were formed on the surface of the element body.

[0403] In this manner, the multilayer coil component of Example 1 was manufactured.

[0404] The laminated coil component of Example 1 had a lengthwise dimension of 2.0 mm, a heightwise dimension of 1.25 mm, and a widthwise dimension of 1.25 mm.

[0405] [Comparative Example 1] A laminated coil component was manufactured as the laminated coil component of Comparative Example 1, in which a region in which a coil conductor does not exist between the first parallel running section and the second parallel running section has three insulating layer layers when viewed from the stacking direction. The laminated coil component of Comparative Example 1 was manufactured in the same manner as the laminated coil component of Example 1, except that in the <Conductor pattern forming step> and the <Laminate block manufacturing step>, five units were laminated by continuously stacking three coil sheets on which a conductor pattern for a coil conductor having the same shape as the coil conductor Q3 shown in Fig. 2 and Fig. 3 was formed, so that the entire conductor pattern for a coil conductor formed on each coil sheet became an overlapping parallel running section when viewed from the stacking direction, while rotating the conductor pattern for a coil conductor by 90° clockwise.

[0406] [evaluation] First, the laminated coil component of Example 1 and the laminated coil component of Comparative Example 1 were each sealed with resin while standing vertically with the second main surface of the element body exposed upward. Then, each laminated coil component was polished with a polisher from the second main surface side to the first main surface side of the element body up to approximately the center in the height direction, while the presence or absence of cracks in the element body was successively observed with a digital microscope in cross sections along the length and width directions.

[0407] In the stacked coil component of Example 1, in which the area where no coil conductor is present between the first parallel running section and the second parallel running section is only one insulating layer in length when viewed from the stacking direction, no cracks occurred in the element body.

[0408] On the other hand, in the laminated coil component of Comparative Example 1, in which an area where no coil conductor exists between the first parallel running section and the second parallel running section is equivalent to three insulating layers when viewed from the stacking direction, cracks occurred in the element body. [Explanation of symbols]

[0409] 1, 2, 3, 4 Multilayer coil components 10A, 10B, 10C, 10D Base 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, 30D coils 41 First lead conductor 42 Second lead-out conductor C Coil shaft Ea1, Ea2, Eb2, Ea3, Eb3, Ea4 First laminate Fa1, Fa2, Fb2, Fa3, Fb3, Fa4 Second laminate Ga1, Ga2, Gb2, Ga3, Gb3, Ga4 middle part L Length direction Ma1, Ma2, Mb2, Ma3, Mb3, Ma4 First parallel running section Na1, Na2, Nb2, Na3, Nb3, Na4 Second parallel running section P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P13, P14, P15, P16, P17, P18, P19, P20, P21, P22, P23, P24, P25, P26, P27, P28, P29, P30, P31, P32, P33, P34, P35, Px, Py Insulating layer Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21, Q22, Q23, Q24, Q25, Q26, Q27, Q28, Q29, Q30, Q31, Q32, Q33, Q34, Q35 Coil conductor Ra1, Rb1, Ra2, Rc2, Ra3, Rd3, Ra4, Rb4, Rb5, Rc5, Rc6, Rd6, Ra7, Rd7, Ra8, Rb8, Rb9, Rc9, Rc10, Rd10, Ra11, Rd11, Ra12, Rb12, Rb13, Rc13, Rb14, Rd14, Ra15, Rb15, Ra16, Rd16, Rc17, Rd17, Rb18, Rc18, Ra19, Rb19, Rc20, Rd20, Ra21, Rd21, Ra22, Rd22, Ra23, Rb23, Rb24, Rc24, Rb25, Rd25, Ra26, Rc26, Rb27, Rc27, Ra28, Rb28, Ra29, Rd29, Rc30, Rd30, Rb31, Rc31, Ra32, Rb32, Ra33, Rb33, Ra34, Rd34, Ra35, Rb35 Land part Rax, Rby Land part for extraction Sa2, Sb2, Sa3, Sb3, Sc3, Sb4, Sc4, Sd4, Sa5, Sc5, Sd5, Sa6, Sb6, Sd6, Sa7, Sb7, Sc7, Sb8, Sc8, Sd8, Sa9, Sc9, Sd9, Sa10, Sb10, Sd10, Sa11, Sb11, Sc11, Sb12, Sc12 , Sd12, Sa13, Sc13, Sd13, Sa14, Sb14, Sd14, Sa15, Sb15, Sa16, Sb16, Sc16, Sd16, Sa17, Sb17, Sc17, Sd17, Sa18, Sb18, Sc18, Sd18, Sa19, Sb19, Sc19, Sd19, Sa20, S b20, Sd20, Sa21, Sb21, Sc21, Sa22, Sb22, Sc22, Sd22, Sb23, Sc23, Sd23, Sa24, Sc24, Sd24, Sa25, Sb25, Sd25, Sa26, Sb26, Sc26, Sa27, Sb27, Sc27, Sd27, Sa28, Sb28, Sc28, Sd28, Sa29, Sb29, Sc29, Sd29, Sa30, Sb30, Sc30, Sd30, Sa31, Sb31, Sc31, Sd31, Sa32, Sb32, Sa33, Sb33, Sc33, Sd33, Sa34, Sb34, Sc34, Sd34, Sa35, Sb35 Via conductor Sa1, Sax, Sby via conductor for extraction T Height direction Ub2, Ub3, Uc3, Uc4, Ud4, Ua5, Ud5, Ua6, Ub6, Ub7, Uc7, Uc8, Ud8, Ua9, Ud9, Ua10, Ub1 0, Ub11, Uc11, Uc12, Ud12, Ua13, Ud13, Ua14, Ub16, Uc16, Ua17, Ub17, Ua18, Ud18, Uc 19, Ud19, Ua20, Ub20, Ub21, Uc21, Ub22, Uc22, Uc23, Ud23, Ua24, Ud24, Ua25, Ub26, Ua27, Ud27, Uc28, Ud28, Ub29, Uc29, Ua30, Ub30, Ua31, Ud31, Uc33, Ud33, Ub34, Uc34 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 section consisting of three or more adjacent coil conductors, a second stacking section consisting of the same number of adjacent coil conductors as the first stacking section, and an intermediate section adjacent to both stacking sections between the first stacking section and the second stacking section and consisting of one or two of the coil conductors, 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 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, the first parallel running section and the second parallel running section overlap each other when viewed from the stacking direction, a first coil conductor that is disposed in a first direction and that is adjacent to the first parallel running section and the second parallel running section, the first coil conductor being disposed in a first direction and that is adjacent to the second parallel running section.

2. The multilayer coil component according to claim 1 , wherein the intermediate portion is made up of one of the coil conductors.

3. 3. 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.

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

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