Laminated coil component

Abstract

To provide a laminated coil component with which cracks and other defects hardly occur to a laminate, and the efficiency of impedance acquisition is high.SOLUTION: The laminated coil component comprises a laminate in which a plurality of insulating layers is laminated in a lamination direction T and a coil 30A is included in the inside, and an external electrode that is provided to the outer surface of the laminate and is electrically connected to the coil. The coil includes a parallel part that is composed of two or more layers of coil conductors CC1-CC10 that are electrically connected in parallel via conductors V2x-V10y. The parallel part includes first parallel parts P1a-P1e, and second parallel parts P2a-P2d that are electrically connected in series to the first parallel parts. Some of the coil conductors (e.g., a coil conductor CC9) constituting the first parallel parts (e.g., a parallel part P1a) and some of the coil conductors (e.g., a coil conductor CC9) constituting the second parallel parts (e.g., a parallel part P2a) are directly connected in the same plane of the same insulating layer.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a multilayer inductor comprising: a laminate formed by stacking a plurality of insulating layers; first and second external electrodes arranged on the outer surface of the laminate; and a plurality of conductor portions arranged on the laminate along the stacking direction of the plurality of insulating layers and connected in series between the first external electrode and the second external electrode, wherein the plurality of conductor portions have a first conductor portion consisting of at least two first conductor patterns and a second conductor portion consisting of one second conductor pattern, the at least two first conductor patterns having the same shape and being arranged so as to be continuous in the stacking direction, one end of each electrically connected to the first external electrode and the other ends electrically connected to each other so as to be connected in parallel, and the second conductor pattern has one end electrically connected to the second external electrode and the other end electrically connected to the first external electrode via the at least two first conductor patterns.

[0003] Patent Document 2 discloses an electronic component comprising: a laminate formed by stacking multiple insulator layers; a coil provided on the laminate and formed by connecting multiple coil conductors by via conductors that penetrate the insulator layers, the coil having a spiral shape that winds around while progressing in the stacking direction; and an external electrode provided on the surface of the laminate; at least some of the combinations of two adjacent coil conductors sandwiching one of the insulator layers have parallel running sections that wind around while overlapping when viewed from the stacking direction, the parallel running sections are connected in parallel by the via conductors or the external electrode; and each combination of two adjacent coil conductors sandwiching one of the insulator layers does not overlap when viewed from the stacking direction, except for the parallel running sections and the connection portions where the coil conductors and the via conductors are connected. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-53368 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-157919 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 discloses a multilayer inductor configured by connecting in series a plurality of pattern groups, each of which is formed by connecting at least two conductor patterns in parallel. For example, in the structure shown in Figure 2 of Patent Document 1, in which two coil conductors are connected in parallel, the two parallel portions are provided on different insulating layers. In this case, the volume of the via conductors overlapping in the stacking direction increases, which increases the stress on the insulating layer, and this may cause defects such as cracks in the laminate.

[0006] On the other hand, in the electronic component described in Patent Document 2, the coil conductors must be formed so that each combination of two adjacent coil conductors sandwiching an insulator layer does not overlap when viewed from the stacking direction, except in the parallel running sections and the connection portions where the coil conductors and via conductors are connected. In this case, the length of the coil conductor that can be formed in one insulator layer is limited, which causes a problem of limiting the efficiency of obtaining impedance per insulator layer.

[0007] An object of the present invention is to provide a laminated coil component in which defects such as cracks are unlikely to occur in the laminate and which has high impedance acquisition efficiency. [Means for solving the problem]

[0008] The laminated coil component of the present invention includes a laminate formed by stacking multiple insulating layers in a stacking direction and incorporating a coil therein, and an external electrode provided on the outer surface of the laminate and electrically connected to the coil. The coil is formed by electrically connecting multiple coil conductors stacked together with the insulating layers in the stacking direction. The coil includes a parallel section formed by two or more layers of the coil conductors electrically connected in parallel through via conductors. The parallel section includes a first parallel section and a second parallel section electrically connected in series to the first parallel section. A portion of the coil conductor constituting the first parallel section and a portion of the coil conductor constituting the second parallel section are arranged so as to be directly connected on the same surface of the first insulating layer, which is the same insulating layer. When the coil conductors adjacent to each other across the first insulating layer are viewed in the stacking direction, at least a portion of the coil conductors adjacent to each other across the first insulating layer overlap, even in areas other than the parallel section connected in parallel across the first insulating layer. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a laminated coil component in which defects such as cracks are unlikely to occur in the laminate and which has high impedance acquisition efficiency. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view schematically illustrating an example of a laminated coil component according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a plan view schematically showing an example of a laminate constituting the laminated coil component according to the first embodiment of the present invention. [Figure 3] FIG. 3 is an exploded perspective view of a coil built into the laminate shown in FIG. [Figure 4-1] FIG. 4-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30A shown in FIG. [Figure 4-2] FIG. 4-2 is a plan view schematically showing the path of the parallel portion P2a included in the coil 30A shown in FIG. [Figure 4-3] FIG. 4-3 is a plan view schematically showing the path of the parallel portion P1b included in the coil 30A shown in FIG. [Figure 4-4] FIG. 4-4 is a plan view schematically showing the path of the parallel portion P2b included in the coil 30A shown in FIG. [Figure 5] FIG. 5 is a development view that schematically shows an example of a coil that constitutes the laminated coil component according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a development view that schematically shows an example of a coil that constitutes a conventional laminated coil component. [Figure 7] FIG. 7 is a plan view schematically showing an example of a laminate constituting the laminated coil component according to the second embodiment of the present invention. [Figure 8] FIG. 8 is an exploded perspective view of a coil built into the laminate shown in FIG. [Figure 9-1] FIG. 9-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30B shown in FIG. [Figure 9-2] FIG. 9-2 is a plan view schematically showing the path of the parallel portion P2a included in the coil 30B shown in FIG. [Figure 9-3] FIG. 9-3 is a plan view schematically showing the path of the parallel portion P1b included in the coil 30B shown in FIG. [Figure 9-4] FIG. 9-4 is a plan view schematically showing the path of the parallel portion P2b included in the coil 30B shown in FIG. [Figure 10] FIG. 10 is a plan view schematically showing an example of a laminate constituting the laminated coil component according to the third embodiment of the present invention. [Figure 11] FIG. 11 is an exploded perspective view of a coil built into the laminate shown in FIG. [Figure 12-1] FIG. 12-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30C shown in FIG. [Figure 12-2] FIG. 12-2 is a plan view schematically illustrating the path of the parallel portion P2a included in the coil 30C shown in FIG. [Figure 12-3]FIG. 12-3 is a plan view schematically illustrating the path of the parallel portion P1b included in the coil 30C illustrated in FIG. [Figure 12-4] FIG. 12-4 is a plan view schematically illustrating the path of the parallel portion P2b included in the coil 30C illustrated in FIG. [Figure 12-5] FIG. 12-5 is a plan view schematically showing the path of the parallel portion P1c included in the coil 30C shown in FIG. [Figure 12-6] FIG. 12-6 is a plan view schematically showing the path of the parallel portion P2c included in the coil 30C shown in FIG. [Figure 12-7] FIG. 12-7 is a plan view schematically showing the path of the parallel portion P1d included in the coil 30C shown in FIG. [Figure 12-8] FIG. 12-8 is a plan view schematically showing the path of the parallel portion P2d included in the coil 30C shown in FIG. [Figure 12-9] FIG. 12-9 is a plan view schematically showing the path of the parallel portion P1e included in the coil 30C shown in FIG. [Figure 12-10] FIG. 12-10 is a plan view schematically showing the path of the parallel portion P2e included in the coil 30C shown in FIG. [Figure 12-11] FIG. 12-11 is a plan view schematically showing the path of the parallel portion P1f included in the coil 30C shown in FIG. [Figure 13] FIG. 13 is a plan view schematically showing an example of a laminate constituting the laminated coil component according to the fourth embodiment of the present invention. [Figure 14] FIG. 14 is an exploded perspective view of a coil built into the laminate shown in FIG. [Figure 15-1] FIG. 15-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30D shown in FIG. [Figure 15-2] FIG. 15-2 is a plan view schematically showing the path of the parallel portion P2a included in the coil 30D shown in FIG. [Figure 15-3] FIG. 15-3 is a plan view schematically showing the path of the parallel portion P1b included in the coil 30D shown in FIG. [Figure 15-4] FIG. 15-4 is a plan view schematically showing the path of the parallel portion P2b included in the coil 30D shown in FIG. [Figure 15-5] FIG. 15-5 is a plan view schematically showing the path of the parallel portion P1c included in the coil 30D shown in FIG. [Figure 15-6] FIG. 15-6 is a plan view schematically showing the path of the parallel portion P2c included in the coil 30D shown in FIG. [Figure 15-7] FIG. 15-7 is a plan view schematically showing the path of the parallel portion P1d included in the coil 30D shown in FIG. [Figure 15-8] FIG. 15-8 is a plan view schematically showing the path of the parallel portion P2d included in the coil 30D shown in FIG. [Figure 15-9] FIG. 15-9 is a plan view schematically showing the path of the parallel portion P1e included in the coil 30D shown in FIG. [Figure 15-10] FIG. 15-10 is a plan view schematically showing the path of the parallel portion P2e included in the coil 30D shown in FIG. [Figure 15-11] FIG. 15-11 is a plan view schematically showing the path of the parallel portion P1f included in the coil 30D shown in FIG. [Figure 16] FIG. 16 is a plan view schematically showing an example of a laminate constituting the laminated coil component according to the fifth embodiment of the present invention. [Figure 17] FIG. 17 is an exploded perspective view of the coil built into the laminate shown in FIG. [Figure 18-1] FIG. 18-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30E shown in FIG. [Figure 18-2] FIG. 18-2 is a plan view schematically showing the path of the parallel portion P2a included in the coil 30E shown in FIG. [Figure 18-3] FIG. 18-3 is a plan view schematically showing the path of the parallel portion P1b included in the coil 30E shown in FIG. [Figure 18-4]FIG. 18-4 is a plan view schematically showing the path of the parallel portion P2b included in the coil 30E shown in FIG. [Figure 18-5] FIG. 18-5 is a plan view schematically showing the path of the parallel portion P1c included in the coil 30E shown in FIG. [Figure 19] FIG. 19 is a development view schematically showing an example of a coil constituting a laminated coil component according to another embodiment of the present invention. [Figure 20] FIG. 20 is a development view that schematically shows another example of a coil that constitutes a conventional laminated coil component. DETAILED DESCRIPTION OF THE INVENTION

[0011] The laminated coil component of the present invention will be described below. Note that the present invention is not limited to the following configurations, and may be modified as appropriate within the scope of the present invention. Furthermore, a combination of multiple individual preferred configurations described below also constitutes the present invention.

[0012] In this specification, terms indicating the relationship between elements (e.g., "perpendicular," "parallel," "orthogonal," etc.) and terms indicating the shape of elements are not expressions that express only strict meanings, but are expressions that also include a range of substantial equivalence, for example, a difference of a few percent.

[0013] In the multilayer coil component of the present invention, the parallel section included in the coil includes a first parallel section and a second parallel section electrically connected in series to the first parallel section. A portion of the coil conductor constituting the first parallel section and a portion of the coil conductor constituting the second parallel section are arranged so as to be directly connected to each other on the same surface of the first insulating layer. By arranging a portion of the coil conductor constituting the first parallel section and a portion of the coil conductor constituting the second parallel section on the same insulating layer, the number of via conductors overlapping in the stacking direction can be reduced compared to a structure in which the coil conductors constituting the first parallel section and the coil conductors constituting the second parallel section are arranged on different insulating layers. This reduces the occurrence of defects such as cracks. Note that the term "direct connection" as used herein also includes cases in which the coil conductors constituting each parallel section are connected to each other via lands.

[0014] Furthermore, in the multilayer coil component of the present invention, when adjacent coil conductors sandwiching the first insulating layer are viewed in the stacking direction, at least a portion of adjacent coil conductors sandwiching the first insulating layer overlap, even in areas other than the parallel portion connected in parallel with the first insulating layer sandwiched between them. This allows the coil conductors to be formed so that the total length of the first parallel portion and the second parallel portion is long, resulting in a coil with high impedance acquisition efficiency. Note that the "parallel portion connected in parallel" referred to here also includes the land portion.

[0015] In the laminated coil component of the present invention, as described above, a portion of the coil conductor constituting the first parallel section and a portion of the coil conductor constituting the second parallel section are arranged so as to be directly connected on the first insulating layer, but the remaining portion of the coil conductor constituting the first parallel section (the portion of the coil conductor constituting the first parallel section that is not on the first insulating layer) and the remaining portion of the coil conductor constituting the second parallel section (the portion of the coil conductor constituting the second parallel section that is not on the first insulating layer) may be arranged on different insulating layers.

[0016] In the laminated coil component of the present invention, the first parallel portion and the second parallel portion may or may not overlap when viewed in the stacking direction.

[0017] In the laminated coil component of the present invention, the number of coil conductors constituting the parallel portion including the first parallel portion and the second parallel portion is not particularly limited. It is preferable that the number of coil conductors constituting the parallel portion including the first parallel portion and the second parallel portion be the same. For example, the parallel portion including the first parallel portion and the second parallel portion may each be composed of two layers of coil conductors. In this case, the maximum number of via conductors that are continuously overlapping in the stacking direction can be reduced from three to two. Alternatively, the parallel portion including the first parallel portion and the second parallel portion may each be composed of three layers of coil conductors. In this case, the maximum number of via conductors that are continuously overlapping in the stacking direction can be reduced from five to three. The parallel portion including the first parallel portion and the second parallel portion may each be composed of four or more layers of coil conductors.

[0018] In the laminated coil component of the present invention, the ratio of the path of the first parallel section to the path of one turn of the coil may be the same as the ratio of the path of the second parallel section to the path of one turn of the coil, but it is preferable that the ratio of the path of the first parallel section to the path of one turn of the coil is different from the ratio of the path of the second parallel section to the path of one turn of the coil.

[0019] As will be described in the embodiments below, when the planar shape of the coil is a polygon such as a rectangle, the proportion of the path of the first parallel portion or the second parallel portion is calculated assuming that the planar shape is a regular polygon such as a square with all sides of the same length. Similarly, when the planar shape of the coil is an ellipse or an oval, the proportion of the path of the first parallel portion or the second parallel portion is calculated assuming that the planar shape is a circle.

[0020] For example, the ratio of the path of the first parallel section to the path of one turn of the coil is 0.4 or more and 0.8 or less, while the ratio of the path of the second parallel section to the path of one turn of the coil is 0.1 or more and less than 0.4.

[0021] In the laminated coil component of the present invention, the number of parallel portions included in the coil is not particularly limited. That is, in the laminated coil component of the present invention, the parallel portions may include one or more parallel portions other than the first parallel portion and the second parallel portion.

[0022] For example, the parallel section may further include a third parallel section electrically connected in series with the second parallel section.

[0023] When the parallel section includes a third parallel section, it is preferable that a portion of the coil conductor constituting the second parallel section and a portion of the coil conductor constituting the third parallel section are arranged so as to be directly connected on the same surface of the same insulating layer, which is the second insulating layer. That is, it is preferable that the first parallel section, the second parallel section, and the third parallel section are connected continuously in the stacking direction without using any coil conductor other than the parallel sections. In this case, the first parallel section, the second parallel section, and the third parallel section may be connected via lands.

[0024] When the parallel portion includes a third parallel portion, when adjacent coil conductors sandwiched between the second insulating layer are viewed from the stacking direction, at least a portion of adjacent coil conductors sandwiched between the second insulating layer may overlap, even in parallel portions other than those connected in parallel with the second insulating layer sandwiched between them.

[0025] When a portion of the coil conductor constituting the second parallel section and a portion of the coil conductor constituting the third parallel section are arranged so as to be directly connected on the second insulating layer, the remaining portion of the coil conductor constituting the second parallel section (the portion of the coil conductor constituting the second parallel section that is not on the second insulating layer) and the remaining portion of the coil conductor constituting the third parallel section (the portion of the coil conductor constituting the third parallel section that is not on the second insulating layer) may be arranged on different insulating layers.

[0026] When a portion of the coil conductor constituting the second parallel portion and a portion of the coil conductor constituting the third parallel portion are arranged so as to be directly connected on the second insulating layer, the second parallel portion and the third parallel portion may or may not overlap when viewed from the stacking direction.

[0027] For example, the ratio of the path of the third parallel portion to the path of one turn of the coil is not less than 0.4 and not more than 0.8.

[0028] The parallel section may further include a fourth parallel section electrically connected in series to the third parallel section.

[0029] When the parallel section includes a third parallel section and a fourth parallel section, it is preferable that a portion of the coil conductor constituting the third parallel section and a portion of the coil conductor constituting the fourth parallel section are arranged so as to be directly connected on the same surface of the same insulating layer, that is, the third insulating layer. That is, it is preferable that the first parallel section, the second parallel section, the third parallel section, and the fourth parallel section are connected continuously in the stacking direction without using coil conductors other than those parallel sections. In this case, the first parallel section, the second parallel section, the third parallel section, and the fourth parallel section may be connected via lands.

[0030] When the parallel portion includes a third parallel portion and a fourth parallel portion, when adjacent coil conductors sandwiched between the third insulating layer are viewed from the stacking direction, at least a portion of adjacent coil conductors sandwiched between the third insulating layer may overlap, even in parallel portions other than those connected in parallel between the third insulating layer.

[0031] When a portion of the coil conductor constituting the third parallel section and a portion of the coil conductor constituting the fourth parallel section are arranged so as to be directly connected on the third insulating layer, the remaining portion of the coil conductor constituting the third parallel section (the portion of the coil conductor constituting the third parallel section that is not on the third insulating layer) and the remaining portion of the coil conductor constituting the fourth parallel section (the portion of the coil conductor constituting the fourth parallel section that is not on the third insulating layer) may be arranged on different insulating layers.

[0032] When a portion of the coil conductor constituting the third parallel section and a portion of the coil conductor constituting the fourth parallel section are arranged so as to be directly connected on the third insulating layer, the third parallel section and the fourth parallel section may or may not overlap when viewed from the stacking direction.

[0033] For example, the ratio of the path of the fourth parallel portion to the path of one turn of the coil is equal to or greater than 0.1 and less than 0.4.

[0034] In the laminated coil component of the present invention, the planar shape of the coil conductor is not particularly limited. The planar shape of the coil conductor may be, for example, a shape having a bent portion such as an L-shape or an angular U-shape (or a C-shape), or a shape having an arc-shaped portion such as a U-shape or a C-shape.

[0035] In the laminated coil component of the present invention, at least one via conductor may be connected to a side of the coil conductor other than the bent portion.

[0036] The following embodiments are merely examples, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. From the second embodiment onwards, descriptions of matters common to the first embodiment will be omitted, and only differences will be described. In particular, similar effects resulting from similar configurations will not be mentioned in each embodiment.

[0037] The drawings shown below are schematic diagrams, and the dimensions, aspect ratio, scale, etc. may differ from those of the actual product.

[0038] [First embodiment] FIG. 1 is a perspective view schematically illustrating an example of a laminated coil component according to a first embodiment of the present invention.

[0039] The laminated coil component 1A shown in Fig. 1 includes a laminate 10A and external electrodes 21 and 22. The laminate 10A has, for example, a rectangular parallelepiped or approximately rectangular parallelepiped shape having six sides. Although not shown in Fig. 1, the laminate 10A is formed by stacking multiple insulating layers in the stacking direction, and has a built-in coil inside. The external electrodes 21 and 22 are each electrically connected to the coil.

[0040] In the laminated coil component 1A and the laminate 10A, the length direction, height direction, and width direction are defined as the L direction, T direction, and W direction in Fig. 1. Here, the length direction L, height direction T, and width direction W are perpendicular to each other.

[0041] In the example shown in FIG. 1, the laminate 10A has a first end face 11 and a second end face 12 facing each other in the length direction L, a first main face 13 and a second main face 14 facing each other in the height direction T, and a first side face 15 and a second side face 16 facing each other in the width direction W.

[0042] Although not shown in Fig. 1, the corners and ridges of the laminate 10A are preferably rounded. The corners of the laminate 10A are portions where three surfaces of the laminate 10A intersect, and the ridges of the laminate 10A are portions where two surfaces of the laminate 10A intersect.

[0043] Of the external electrodes 21 and 22, one external electrode 21 covers the entire first end face 11 of the laminate 10A, and extends from the first end face 11 to cover part of the first main face 13, part of the second main face 14, part of the first side face 15, and part of the second side face 16, as shown in FIG.

[0044] Of the external electrodes 21 and 22, the other external electrode 22 covers the entire second end face 12 of the laminate 10A, and extends from the second end face 12 to cover part of the first main face 13, part of the second main face 14, part of the first side face 15, and part of the second side face 16, as shown in FIG.

[0045] When the laminated coil component 1A having the external electrodes 21 and 22 arranged as described above is mounted on a substrate, any one of the first main surface 13, the second main surface 14, the first side surface 15, and the second side surface 16 of the laminate 10A serves as the mounting surface.

[0046] Fig. 2 is a plan view schematically illustrating an example of a laminate constituting the laminate coil component according to the first embodiment of the present invention, Fig. 3 is an exploded perspective view of a coil built in the laminate shown in Fig. 2.

[0047] The laminate 10A shown in FIG. 2 incorporates a coil 30A shown in FIG.

[0048] 2, the laminate 10A is configured by stacking a plurality of insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, and IL10 in a height direction T from a first main surface 13 (see FIG. 1) toward a second main surface 14 (see FIG. 1) of the laminate 10A. Hereinafter, the insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, and IL10 will also be collectively referred to as insulating layers IL.

[0049] In Figure 2, the insulating layer IL1 is arranged on the lower side (the first main surface 13 side of the laminate 10A) in the stacking direction (here, the height direction T), and the insulating layer IL10 is arranged on the upper side (the second main surface 14 side of the laminate 10A) in the stacking direction, and of the main surfaces of each insulating layer IL, the main surface on the negative side of the height direction T (the back side of the paper in Figure 2) is arranged on the lower side in the stacking direction, and the main surface on the positive side of the height direction T (the front side of the paper in Figure 2) is arranged on the upper side in the stacking direction.

[0050] The insulating layers IL may be made of a magnetic material such as a ferrite material.

[0051] 2, insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, and IL10 are provided with coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, and CC10, respectively. Hereinafter, coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, and CC10 will also be collectively referred to as coil conductors CC.

[0052] Coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9 and CC10 are respectively provided on the main surfaces of insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9 and IL10, specifically on the main surfaces on the positive side of the height direction T (the front side of the paper in Figure 2).

[0053] A plurality of coil conductors CC stacked together with insulating layers IL in the stacking direction (here, the height direction T) are electrically connected to form the coil 30A shown in FIG.

[0054] 2 and 3, the length of the coil conductors CC excluding the coil conductors CC1 and CC10 is 3 / 4 of the turn of the coil 30A, while the length of the coil conductors CC1 and CC10 is 1 / 2 of the turn of the coil 30A.

[0055] The coil conductor CC10 of the tenth layer L10 is L-shaped. In the insulating layer IL10 of the tenth layer L10, via conductors V10x and V10y are provided at both ends of the coil conductor CC10.

[0056] The coil conductor CC9 of the ninth layer L9 is U-shaped. In the insulating layer IL9 of the ninth layer L9, a via conductor V9x is provided at one end of the coil conductor CC9, and a via conductor V9y is provided at a bent portion of the coil conductor CC9.

[0057] The coil conductor CC8 of the eighth layer L8 is U-shaped. In the insulating layer IL8 of the eighth layer L8, a via conductor V8x is provided at a bent portion of the coil conductor CC8, and a via conductor V8y is provided at one end of the coil conductor CC8.

[0058] The coil conductor CC7 of the seventh layer L7 is U-shaped. In the insulating layer IL7 of the seventh layer L7, a via conductor V7x is provided at one end of the coil conductor CC7, and a via conductor V7y is provided at a bent portion of the coil conductor CC7.

[0059] The coil conductor CC6 of the sixth layer L6 is U-shaped. In the insulating layer IL6 of the sixth layer L6, a via conductor V6x is provided at a bent portion of the coil conductor CC6, and a via conductor V6y is provided at one end of the coil conductor CC6.

[0060] The coil conductor CC5 of the fifth layer L5 is U-shaped. In the insulating layer IL5 of the fifth layer L5, a via conductor V5x is provided at one end of the coil conductor CC5, and a via conductor V5y is provided at a bent portion of the coil conductor CC5.

[0061] The coil conductor CC4 of the fourth layer L4 is U-shaped. In the insulating layer IL4 of the fourth layer L4, a via conductor V4x is provided at a bent portion of the coil conductor CC4, and a via conductor V4y is provided at one end of the coil conductor CC4.

[0062] The coil conductor CC3 of the third layer L3 is U-shaped. In the insulating layer IL3 of the third layer L3, a via conductor V3x is provided at one end of the coil conductor CC3, and a via conductor V3y is provided at a bent portion of the coil conductor CC3.

[0063] The coil conductor CC2 of the second layer L2 is U-shaped. In the insulating layer IL2 of the second layer L2, a via conductor V2x is provided at a bent portion of the coil conductor CC2, and a via conductor V2y is provided at one end of the coil conductor CC2.

[0064] The coil conductor CC1 of the first layer L1 is L-shaped.

[0065] Hereinafter, via conductors V2x, V2y, V3x, V3y, V4x, V4y, V5x, V5y, V6x, V6y, V7x, V7y, V8x, V8y, V9x, V9y, V10x, and V10y will also be collectively referred to as via conductors V.

[0066] The via conductors V are provided so as to penetrate the insulating layer IL in the stacking direction (here, the height direction T).

[0067] It is preferable that lands be provided on the main surface of the insulating layer IL to be connected to the via conductors V. In this case, it is preferable that the size of the lands is slightly larger than the line width of the coil conductor CC excluding the land portion.

[0068] Examples of materials constituting each of the coil conductors CC (including the lands) and each of the via conductors V include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0069] 2 are stacked in the height direction T, the coil conductors CC are electrically connected through the via conductors V. As a result, a solenoid coil 30A having a coil axis extending in the height direction T is formed in the laminate 10A, as shown in FIG.

[0070] 2, an extension conductor 41 exposed at a first end face 11 (see FIG. 1) of the laminate 10A is connected to an end of the coil conductor CC10 of the tenth layer L10. The extension conductor 41 connects the external electrode 21 (see FIG. 1) and the coil conductor CC10 within the laminate 10A.

[0071] Similarly, an extension conductor 42 exposed at a second end surface 12 (see FIG. 1) of the laminate 10A is connected to an end of the coil conductor CC1 of the first layer L1. The extension conductor 42 connects the external electrode 22 (see FIG. 1) and the coil conductor CC1 within the laminate 10A.

[0072] Although not shown in FIG. 2 , the laminate 10A preferably includes one or more insulating layers IL on the second main surface 14 side, on which the coil conductor CC is not provided. In this case, the lead conductor 41 may be exposed on the second main surface 14 of the laminate 10A. As such, the surface on which the lead conductor 41 is exposed from the laminate 10A does not have to be the first end surface 11 of the laminate 10A. Similarly, the laminate 10A preferably includes one or more insulating layers IL on which the coil conductor CC is not provided on the first main surface 13 side. In this case, the lead conductor 42 may be exposed on the first main surface 13 of the laminate 10A. As such, the surface on which the lead conductor 42 is exposed from the laminate 10A does not have to be the second end surface 12 of the laminate 10A. The same applies to the following embodiments.

[0073] When viewed from the height direction T, the coil 30A may have a shape (e.g., a polygonal shape) composed of straight portions as shown in Figures 2 and 3, a shape (e.g., a circular or elliptical shape) composed of curved portions, or a shape composed of straight and curved portions.

[0074] In the example shown in Figures 2 and 3, the stacking direction of the insulating layer IL and the direction of the coil axis of the coil 30A are perpendicular to the mounting surface (e.g., the first main surface 13) of the laminate 10A, but the stacking direction of the insulating layer IL and the direction of the coil axis of the coil 30A may also be parallel to the mounting surface (e.g., the first main surface 13) of the laminate 10A.

[0075] The coil 30A includes a parallel section made up of two layers of coil conductors CC electrically connected in parallel through via conductors V. The parallel section includes a first parallel section and a second parallel section electrically connected in series to the first parallel section. Note that the number of parallel sections included in the coil 30A is not particularly limited.

[0076] In the example shown in Figure 3, parallel portion P1e, parallel portion P2d, parallel portion P1d, parallel portion P2c, parallel portion P1c, parallel portion P2b, parallel portion P1b, parallel portion P2a, and parallel portion P1a are arranged from the negative direction to the positive direction in the height direction T. For example, parallel portion P1a is the first parallel portion, and parallel portion P2a is the second parallel portion. Note that the first parallel portion is not limited to parallel portion P1a, and may be any of parallel portions P1a, P1b, P1c, and P1d.

[0077] The parallel portion P1a is configured by electrically connecting in parallel the coil conductor CC10 of the tenth layer L10 and part of the coil conductor CC9 of the ninth layer L9 through via conductors V10x and V10y.

[0078] The parallel portion P2a is configured by electrically connecting in parallel a part of the coil conductor CC9 of the ninth layer L9 and a part of the coil conductor CC8 of the eighth layer L8 through via conductors V9x and V9y.

[0079] The parallel portion P1b is configured by electrically connecting in parallel a part of the coil conductor CC8 in the eighth layer L8 and a part of the coil conductor CC7 in the seventh layer L7 through via conductors V8x and V8y.

[0080] The parallel portion P2b is configured by electrically connecting in parallel a part of the coil conductor CC7 in the seventh layer L7 and a part of the coil conductor CC6 in the sixth layer L6 through via conductors V7x and V7y.

[0081] The parallel portion P1c is configured by electrically connecting in parallel a part of the coil conductor CC6 of the sixth layer L6 and a part of the coil conductor CC5 of the fifth layer L5 through via conductors V6x and V6y.

[0082] The parallel portion P2c is configured by electrically connecting in parallel a part of the coil conductor CC5 of the fifth layer L5 and a part of the coil conductor CC4 of the fourth layer L4 through via conductors V5x and V5y.

[0083] The parallel portion P1d is configured by electrically connecting in parallel a part of the coil conductor CC4 of the fourth layer L4 and a part of the coil conductor CC3 of the third layer L3 through via conductors V4x and V4y.

[0084] The parallel portion P2d is configured by electrically connecting in parallel a part of the coil conductor CC3 of the third layer L3 and a part of the coil conductor CC2 of the second layer L2 through via conductors V3x and V3y.

[0085] The parallel portion P1e is configured by electrically connecting in parallel a part of the coil conductor CC2 of the second layer L2 and the coil conductor CC1 of the first layer L1 through via conductors V2x and V2y.

[0086] As shown in Figures 2 and 3, a portion of the coil conductor CC constituting the first parallel portion and a portion of the coil conductor CC constituting the second parallel portion are arranged so as to be directly connected on the same surface of the first insulating layer, which is the same insulating layer IL.

[0087] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, the insulating layer IL9 of the ninth layer L9 corresponds to the first insulating layer. In this case, a portion of the coil conductor CC9 that constitutes the parallel portion P1a and a portion of the coil conductor CC9 that constitutes the parallel portion P2a are arranged so as to be directly connected on the same surface of the insulating layer IL9 of the ninth layer L9.

[0088] Furthermore, when adjacent coil conductors CC sandwiched between the first insulating layer are viewed from the stacking direction (here, the height direction T), at least a portion of adjacent coil conductors CC sandwiched between the first insulating layer overlaps, even in areas other than the parallel sections connected in parallel across the first insulating layer.

[0089] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, when the adjacent coil conductors CC9 and CC8 are sandwiched between the insulating layer IL9 of the ninth layer L9, which corresponds to the first insulating layer, and viewed from the height direction T, a portion of the coil conductor CC9 constituting the parallel portion P1a overlaps with a portion of the coil conductor CC8 constituting the parallel portion P1b, in addition to the parallel portion P2a connected in parallel with the insulating layer IL9 sandwiched between them.

[0090] The parallel portion included in the coil 30A may further include a third parallel portion electrically connected in series to the second parallel portion. For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, then the parallel portion P1b is the third parallel portion.

[0091] As shown in Figures 2 and 3, it is preferable that a portion of the coil conductor CC constituting the second parallel portion and a portion of the coil conductor CC constituting the third parallel portion are arranged so as to be directly connected on the same surface of the second insulating layer, which is the same insulating layer IL.

[0092] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, the insulating layer IL8 of the eighth layer L8 corresponds to the second insulating layer. In this case, a portion of the coil conductor CC8 that constitutes the parallel portion P2a and a portion of the coil conductor CC8 that constitutes the parallel portion P1b are arranged so as to be directly connected to each other on the same surface of the insulating layer IL8 of the eighth layer L8.

[0093] The parallel portion included in the coil 30A may further include a fourth parallel portion electrically connected in series to the third parallel portion. For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, then the parallel portion P2b is the fourth parallel portion.

[0094] As shown in Figures 2 and 3, it is preferable that a portion of the coil conductor CC constituting the third parallel portion and a portion of the coil conductor CC constituting the fourth parallel portion are arranged so as to be directly connected on the same surface of the third insulating layer, which is the same insulating layer IL.

[0095] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, the parallel portion P1b is the third parallel portion, and the parallel portion P2b is the fourth parallel portion, the insulating layer IL7 of the seventh layer L7 corresponds to the third insulating layer. In this case, a portion of the coil conductor CC7 that constitutes the parallel portion P1b and a portion of the coil conductor CC7 that constitutes the parallel portion P2b are arranged so as to be directly connected on the same surface of the insulating layer IL7 of the seventh layer L7.

[0096] In the example shown in FIG. 3, the ratio of the path of the first parallel portion to the path of one turn of the coil 30A is different from the ratio of the path of the second parallel portion to the path of one turn of the coil 30A.

[0097] As will be described below, when the planar shape of the coil 30A is rectangular, the ratio of the path of the parallel portion is calculated assuming that the planar shape is square.

[0098] FIG. 4-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30A shown in FIG.

[0099] The parallel portion P1a is L-shaped with a short side and a long side. The length of the parallel portion P1a is the length of 1 / 2 of the turn of the coil 30A. In other words, the ratio of the path of the parallel portion P1a to the path of one turn of the coil 30A is 1 / 2 (0.5).

[0100] FIG. 4-2 is a plan view schematically showing the path of the parallel portion P2a included in the coil 30A shown in FIG.

[0101] The parallel portion P2a has a straight line shape including a short side. The length of the parallel portion P2a is ¼ of the length of the turn of the coil 30A. In other words, the ratio of the path of the parallel portion P2a to the path of one turn of the coil 30A is ¼ (0.25).

[0102] FIG. 4-3 is a plan view schematically showing the path of the parallel portion P1b included in the coil 30A shown in FIG.

[0103] The parallel portion P1b is L-shaped with a long side and a short side. The length of the parallel portion P1b is the length of 1 / 2 of the turn of the coil 30A. In other words, the ratio of the path of the parallel portion P1b to the path of one turn of the coil 30A is 1 / 2 (0.5).

[0104] FIG. 4-4 is a plan view schematically showing the path of the parallel portion P2b included in the coil 30A shown in FIG.

[0105] The parallel portion P2b is linear and includes a long side. The length of the parallel portion P2b is ¼ of the length of the turn of the coil 30A. In other words, the ratio of the path of the parallel portion P2b to the path of one turn of the coil 30A is ¼ (0.25).

[0106] The same applies to the parallel portion P1c, the parallel portion P2c, the parallel portion P1d, the parallel portion P2d, and the parallel portion P1e.

[0107] Thus, in the example shown in Figures 2 and 3, if the parallel section P1a is the first parallel section and the parallel section P2a is the second parallel section, the ratio of the path of the first parallel section to the path of one turn of the coil 30A (1 / 2) is different from the ratio of the path of the second parallel section to the path of one turn of the coil 30A (1 / 4).

[0108] Furthermore, in the example shown in Figures 2 and 3, for example, if parallel section P1a is the first parallel section, parallel section P2a is the second parallel section, parallel section P1b is the third parallel section, and parallel section P2b is the fourth parallel section, the ratio of the path of the first parallel section to the path of one turn of coil 30A is the same (1 / 2) as the ratio of the path of the third parallel section to the path of one turn of coil 30A, and the ratio of the path of the second parallel section to the path of one turn of coil 30A is the same (1 / 4) as the ratio of the path of the fourth parallel section to the path of one turn of coil 30A.

[0109] FIG. 5 is a development view that schematically shows an example of a coil that constitutes the laminated coil component according to the first embodiment of the present invention.

[0110] As shown in Figure 5, when the first parallel section P1 and the second parallel section P2 are each composed of two layers of coil conductors, if a portion of the coil conductor CC constituting the first parallel section P1 and a portion of the coil conductor CC constituting the second parallel section P2 are arranged on the same insulating layer (not shown), the maximum number of via conductors V that overlap consecutively in the stacking direction is two.

[0111] FIG. 6 is a development view that schematically shows an example of a coil that constitutes a conventional laminated coil component.

[0112] As shown in Figure 6, when the first parallel section P1 and the second parallel section P2 are each composed of two layers of coil conductors, if a portion of the coil conductor CC constituting the first parallel section P1 and a portion of the coil conductor CC constituting the second parallel section P2 are not arranged on the same insulating layer (not shown), the maximum number of via conductors V that overlap consecutively in the stacking direction is three.

[0113] Comparing Figures 5 and 6, by arranging a portion of the coil conductor CC constituting the first parallel section P1 and a portion of the coil conductor CC constituting the second parallel section P2 on the same insulating layer, the number of via conductors V overlapping in the stacking direction can be reduced.

[0114] An example of a method for manufacturing the laminated coil component 1A shown in FIG. 1 will now be described.

[0115] <Magnetic material manufacturing process> First, Fe2O3, ZnO, CuO, and NiO are weighed out to give a predetermined ratio.

[0116] Next, these weighed materials and pure water are placed in a ball mill together with PSZ (partially stabilized zirconia) media, mixed, and then pulverized. The mixing and pulverization time is, for example, 4 hours or more and 8 hours or less.

[0117] The resulting pulverized material is then dried and then calcined at a calcination temperature of, for example, 700° C. to 800° C. for, for example, 2 hours to 5 hours.

[0118] In this manner, a powdered magnetic material, more specifically, a powdered magnetic ferrite material is produced.

[0119] The ferrite material is preferably a Ni-Cu-Zn based ferrite material.

[0120] When the total amount of the Ni-Cu-Zn ferrite material is taken as 100 mol%, it is preferable that the material contains Fe in an amount of 40 mol% to 49.5 mol% inclusive, calculated as Fe2O3, Zn in an amount of 2 mol% to 35 mol% inclusive, calculated as ZnO, Cu in an amount of 6 mol% to 13 mol% inclusive, and Ni in an amount of 10 mol% to 45 mol% inclusive, calculated as NiO.

[0121] The Ni-Cu-Zn ferrite material may further contain additives such as Co, Bi, Sn, and Mn.

[0122] The Ni—Cu—Zn ferrite material may further contain inevitable impurities.

[0123] <Green sheet manufacturing process> First, a magnetic material, an organic binder such as 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 produce a slurry.

[0124] 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.

[0125] As the material for the green sheets, instead of a magnetic material, a non-magnetic material such as borosilicate glass material may be used, or a mixed material of a magnetic material and a non-magnetic material may be used.

[0126] <Conductor pattern formation process> First, a via hole is formed by irradiating a predetermined portion of the green sheet with a laser.

[0127] Next, a conductive paste such as Ag paste is applied to the surface of the green sheet by screen printing or the like, filling the via holes. This forms via conductor patterns in the via holes of the green sheet, while forming coil conductor conductor patterns connected to the via conductor patterns on the surface. In this way, a coil sheet is produced in which the coil conductor conductor patterns and the via conductor conductor patterns are formed on the green sheet. The coil sheet is provided with a coil conductor conductor pattern corresponding to the coil conductor CC (including lead conductors 41 and 42) shown in Figures 2 and 3, and a via conductor conductor pattern corresponding to the via conductor V shown in Figures 2 and 3.

[0128] <Laminated block manufacturing process> The coil sheets are stacked in the stacking direction (here, from the negative direction to the positive direction of the height direction T) in the order corresponding to Figures 2 and 3, and then thermocompression bonded to form a laminated block.

[0129] <Laminate and coil manufacturing process> First, the laminate block is cut into a predetermined size using a dicer or the like to produce individual chips.

[0130] 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.

[0131] When the individual chips are fired, the green sheets of the coil sheets become insulating layers.

[0132] Furthermore, when the individual chips are fired, the conductor patterns for the coil conductors and the conductor patterns for the via conductors become coil conductors and via conductors, respectively, resulting in the fabrication of a coil in which multiple coil conductors stacked together with insulating layers are electrically connected through the via conductors.

[0133] In this way, a plurality of insulating layers are stacked in the stacking direction, and a laminate body with a built-in coil is produced.

[0134] The corners and ridges of the laminate may be rounded by, for example, barrel polishing.

[0135] <External electrode formation process> First, a conductive paste such as a paste containing Ag and glass frit is applied to the end surface of the outer surface of the laminate from which the coil is drawn out, thereby forming a conductive paste layer.

[0136] Next, the conductive paste layer is baked to form the base electrodes of the external electrodes. The baking temperature is, for example, 800° C. or higher and 820° C. or lower. The thickness of the base electrodes is, for example, 5 μm.

[0137] Then, a Ni-plated electrode and a Sn-plated electrode are formed in this order on the surface of the base electrode by electrolytic plating, etc. This forms an external electrode having the base electrode, Ni-plated electrode, and Sn-plated electrode in this order.

[0138] In this way, the laminated coil component 1A is manufactured.

[0139] The laminated coil component 1A has dimensions of, for example, a length direction L of 2.0 mm, a width direction W of 1.25 mm, and a height direction T of 1.25 mm.

[0140] [Second embodiment] In the laminated coil component according to the second embodiment of the present invention, at least one via conductor is connected to a side of the coil conductor other than the bent portion.

[0141] Fig. 7 is a plan view schematically showing an example of a laminate constituting a laminate coil component according to a second embodiment of the present invention, and Fig. 8 is an exploded perspective view of a coil built in the laminate shown in Fig. 7.

[0142] The laminate 10B shown in FIG. 7 incorporates a coil 30B shown in FIG.

[0143] 7, similar to the laminate 10A shown in Fig. 2, the laminate 10B is configured by stacking a plurality of insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, and IL10 in the height direction T from the first main surface toward the second main surface of the laminate 10B. Hereinafter, the insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, and IL10 will also be collectively referred to as insulating layers IL.

[0144] 7, insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, and IL10 are provided with coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, and CC10, respectively. Hereinafter, coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, and CC10 will also be collectively referred to as coil conductors CC.

[0145] A plurality of coil conductors CC stacked together with insulating layers IL in the stacking direction (here, the height direction T) are electrically connected to form a coil 30B shown in FIG.

[0146] 7 and 8, the length of the coil conductors CC excluding the coil conductors CC1 and CC10 is 3 / 4 of the turn of the coil 30B, while the length of the coil conductors CC1 and CC10 is 1 / 2 of the turn of the coil 30B.

[0147] In the insulating layer IL10 of the tenth layer L10, via conductors V10x and V10y are provided at both ends of the coil conductor CC10.

[0148] In the insulating layer IL9 of the ninth layer L9, a via conductor V9x is provided at one end of the coil conductor CC9, and a via conductor V9y is provided on one side of the coil conductor CC9.

[0149] In the insulating layer IL8 of the eighth layer L8, via conductors V8x are provided on the sides of the coil conductor CC8, and a via conductor V8y is provided at one end of the coil conductor CC8.

[0150] In the insulating layer IL7 of the seventh layer L7, a via conductor V7x is provided at one end of the coil conductor CC7, and a via conductor V7y is provided on one side of the coil conductor CC7.

[0151] In the insulating layer IL6 of the sixth layer L6, a via conductor V6x is provided on one side of the coil conductor CC6, and a via conductor V6y is provided at one end of the coil conductor CC6.

[0152] In the insulating layer IL5 of the fifth layer L5, a via conductor V5x is provided at one end of the coil conductor CC5, and a via conductor V5y is provided on one side of the coil conductor CC5.

[0153] In the insulating layer IL4 of the fourth layer L4, a via conductor V4x is provided on one side of the coil conductor CC4, and a via conductor V4y is provided at one end of the coil conductor CC4.

[0154] In the insulating layer IL3 of the third layer L3, a via conductor V3x is provided at one end of the coil conductor CC3, and a via conductor V3y is provided on one side of the coil conductor CC3.

[0155] In the insulating layer IL2 of the second layer L2, a via conductor V2x is provided on one side of the coil conductor CC2, and a via conductor V2y is provided at one end of the coil conductor CC2.

[0156] Hereinafter, via conductors V2x, V2y, V3x, V3y, V4x, V4y, V5x, V5y, V6x, V6y, V7x, V7y, V8x, V8y, V9x, V9y, V10x, and V10y will also be collectively referred to as via conductors V.

[0157] 7 are stacked in the height direction T, the coil conductors CC are electrically connected through the via conductors V. As a result, a solenoid coil 30B having a coil axis extending in the height direction T is formed in the laminate 10B, as shown in FIG.

[0158] 7, an extension conductor 41 exposed at a first end surface of the laminate 10B is connected to an end of the coil conductor CC10 of the tenth layer L10. The extension conductor 41 connects one of the external electrodes and the coil conductor CC10 within the laminate 10B.

[0159] Similarly, an extension conductor 42 exposed at a second end surface of the laminate 10B is connected to an end of the coil conductor CC1 of the first layer L1. The extension conductor 42 connects the other external electrode and the coil conductor CC1 within the laminate 10B.

[0160] The coil 30B includes a parallel section made up of two layers of coil conductors CC electrically connected in parallel through via conductors V. The parallel section includes a first parallel section and a second parallel section electrically connected in series to the first parallel section. The number of parallel sections included in the coil 30B is not particularly limited.

[0161] In the example shown in Figure 8, parallel portion P1e, parallel portion P2d, parallel portion P1d, parallel portion P2c, parallel portion P1c, parallel portion P2b, parallel portion P1b, parallel portion P2a, and parallel portion P1a are arranged from the negative direction to the positive direction in the height direction T. For example, parallel portion P1a is the first parallel portion, and parallel portion P2a is the second parallel portion. Note that the first parallel portion is not limited to parallel portion P1a, and may be any of parallel portions P1a, P1b, P1c, and P1d.

[0162] The parallel portion P1a is configured by electrically connecting in parallel the coil conductor CC10 of the tenth layer L10 and part of the coil conductor CC9 of the ninth layer L9 through via conductors V10x and V10y.

[0163] The parallel portion P2a is configured by electrically connecting in parallel a part of the coil conductor CC9 of the ninth layer L9 and a part of the coil conductor CC8 of the eighth layer L8 through via conductors V9x and V9y.

[0164] The parallel portion P1b is configured by electrically connecting in parallel a part of the coil conductor CC8 in the eighth layer L8 and a part of the coil conductor CC7 in the seventh layer L7 through via conductors V8x and V8y.

[0165] The parallel portion P2b is configured by electrically connecting in parallel a part of the coil conductor CC7 in the seventh layer L7 and a part of the coil conductor CC6 in the sixth layer L6 through via conductors V7x and V7y.

[0166] The parallel portion P1c is configured by electrically connecting in parallel a part of the coil conductor CC6 of the sixth layer L6 and a part of the coil conductor CC5 of the fifth layer L5 through via conductors V6x and V6y.

[0167] The parallel portion P2c is configured by electrically connecting in parallel a part of the coil conductor CC5 of the fifth layer L5 and a part of the coil conductor CC4 of the fourth layer L4 through via conductors V5x and V5y.

[0168] The parallel portion P1d is configured by electrically connecting in parallel a part of the coil conductor CC4 of the fourth layer L4 and a part of the coil conductor CC3 of the third layer L3 through via conductors V4x and V4y.

[0169] The parallel portion P2d is configured by electrically connecting in parallel a part of the coil conductor CC3 of the third layer L3 and a part of the coil conductor CC2 of the second layer L2 through via conductors V3x and V3y.

[0170] The parallel portion P1e is configured by electrically connecting in parallel a part of the coil conductor CC2 of the second layer L2 and the coil conductor CC1 of the first layer L1 through via conductors V2x and V2y.

[0171] As shown in Figures 7 and 8, a portion of the coil conductor CC constituting the first parallel portion and a portion of the coil conductor CC constituting the second parallel portion are arranged so as to be directly connected on the same surface of the first insulating layer, which is the same insulating layer IL.

[0172] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, the insulating layer IL9 of the ninth layer L9 corresponds to the first insulating layer. In this case, a portion of the coil conductor CC9 that constitutes the parallel portion P1a and a portion of the coil conductor CC9 that constitutes the parallel portion P2a are arranged so as to be directly connected on the same surface of the insulating layer IL9 of the ninth layer L9.

[0173] Furthermore, when adjacent coil conductors CC sandwiched between the first insulating layer are viewed from the stacking direction (here, the height direction T), at least a portion of adjacent coil conductors CC sandwiched between the first insulating layer overlaps, even in areas other than the parallel sections connected in parallel across the first insulating layer.

[0174] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, when the adjacent coil conductors CC9 and CC8 are sandwiched between the insulating layer IL9 of the ninth layer L9, which corresponds to the first insulating layer, and viewed from the height direction T, a portion of the coil conductor CC9 constituting the parallel portion P1a overlaps with a portion of the coil conductor CC8 constituting the parallel portion P1b, in addition to the parallel portion P2a connected in parallel with the insulating layer IL9 sandwiched between them.

[0175] The parallel portion included in the coil 30B may further include a third parallel portion electrically connected in series to the second parallel portion. For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, then the parallel portion P1b is the third parallel portion.

[0176] As shown in Figures 7 and 8, it is preferable that a portion of the coil conductor CC constituting the second parallel portion and a portion of the coil conductor CC constituting the third parallel portion are arranged so as to be directly connected on the same surface of the second insulating layer, which is the same insulating layer IL.

[0177] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, the insulating layer IL8 of the eighth layer L8 corresponds to the second insulating layer. In this case, a portion of the coil conductor CC8 that constitutes the parallel portion P2a and a portion of the coil conductor CC8 that constitutes the parallel portion P1b are arranged so as to be directly connected to each other on the same surface of the insulating layer IL8 of the eighth layer L8.

[0178] The parallel portion included in the coil 30B may further include a fourth parallel portion electrically connected in series to the third parallel portion. For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, then the parallel portion P2b is the fourth parallel portion.

[0179] As shown in Figures 7 and 8, it is preferable that a portion of the coil conductor CC constituting the third parallel portion and a portion of the coil conductor CC constituting the fourth parallel portion are arranged so as to be directly connected on the same surface of the third insulating layer, which is the same insulating layer IL.

[0180] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, the parallel portion P1b is the third parallel portion, and the parallel portion P2b is the fourth parallel portion, the insulating layer IL7 of the seventh layer L7 corresponds to the third insulating layer. In this case, a portion of the coil conductor CC7 that constitutes the parallel portion P1b and a portion of the coil conductor CC7 that constitutes the parallel portion P2b are arranged so as to be directly connected on the same surface of the insulating layer IL7 of the seventh layer L7.

[0181] In the example shown in FIG. 8, the ratio of the path of the first parallel portion to the path of one turn of the coil 30B is different from the ratio of the path of the second parallel portion to the path of one turn of the coil 30B.

[0182] As will be described below, when the planar shape of the coil 30B is rectangular, the ratio of the path of the parallel portion is calculated assuming that the planar shape is square.

[0183] FIG. 9-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30B shown in FIG.

[0184] The parallel portion P1a has a U-shape that includes half of the short side and half of the long side and short side. The length of the parallel portion P1a is the length of 1 / 2 turn of the coil 30B. In other words, the ratio of the path of the parallel portion P1a to the path of one turn of the coil 30B is 1 / 2 (0.5).

[0185] FIG. 9-2 is a plan view schematically showing the path of the parallel portion P2a included in the coil 30B shown in FIG.

[0186] The parallel portion P2a is L-shaped, including half of the short side and half of the long side. The length of the parallel portion P2a is equal to the length of ¼ of the turn of the coil 30B. In other words, the ratio of the path of the parallel portion P2a to the path of one turn of the coil 30B is ¼ (0.25).

[0187] FIG. 9-3 is a plan view schematically showing the path of the parallel portion P1b included in the coil 30B shown in FIG.

[0188] The parallel portion P1b has a U-shape that includes half of the long side and half of the short side. The length of the parallel portion P1b is the length of 1 / 2 of the turn of the coil 30B. In other words, the ratio of the path of the parallel portion P1b to the path of one turn of the coil 30B is 1 / 2 (0.5).

[0189] FIG. 9-4 is a plan view schematically showing the path of the parallel portion P2b included in the coil 30B shown in FIG.

[0190] The parallel portion P2b is L-shaped, including half of the long side and half of the short side. The length of the parallel portion P2b is equal to the length of ¼ of the turn of the coil 30B. In other words, the ratio of the path of the parallel portion P2b to the path of one turn of the coil 30B is ¼ (0.25).

[0191] The same applies to the parallel portion P1c, the parallel portion P2c, the parallel portion P1d, the parallel portion P2d, and the parallel portion P1e.

[0192] Thus, in the examples shown in Figures 7 and 8, for example, if the parallel section P1a is the first parallel section and the parallel section P2a is the second parallel section, the ratio of the path of the first parallel section to the path of one turn of the coil 30B (1 / 2) is different from the ratio of the path of the second parallel section to the path of one turn of the coil 30B (1 / 4).

[0193] Furthermore, in the examples shown in Figures 7 and 8, for example, if parallel section P1a is the first parallel section, parallel section P2a is the second parallel section, parallel section P1b is the third parallel section, and parallel section P2b is the fourth parallel section, the ratio of the path of the first parallel section to the path of one turn of coil 30B is the same (1 / 2) as the ratio of the path of the third parallel section to the path of one turn of coil 30B, and the ratio of the path of the second parallel section to the path of one turn of coil 30B is the same (1 / 4) as the ratio of the path of the fourth parallel section to the path of one turn of coil 30B.

[0194] [Third embodiment] In the laminated coil component according to the third embodiment of the present invention, the ratio of the path of the first parallel section to the path of one turn of the coil is the same as the ratio of the path of the third parallel section to the path of one turn of the coil, and the ratio of the path of the second parallel section to the path of one turn of the coil is different from the ratio of the path of the fourth parallel section to the path of one turn of the coil. The laminated coil component according to the third embodiment of the present invention is required to include at least one set of first parallel section, second parallel section, third parallel section, and fourth parallel section that satisfy the above relationship.

[0195] Fig. 10 is a plan view schematically showing an example of a laminate constituting a laminate coil component according to a third embodiment of the present invention, and Fig. 11 is an exploded perspective view of a coil built in the laminate shown in Fig. 10.

[0196] The laminate 10C shown in FIG. 10 incorporates a coil 30C shown in FIG.

[0197] 10, similar to the laminate 10A shown in Fig. 2, the laminate 10C is configured by stacking a plurality of insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, IL10, IL11, and IL12 in the height direction T from the first main surface toward the second main surface of the laminate 10C. Hereinafter, the insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, IL10, IL11, and IL12 will also be collectively referred to as insulating layers IL.

[0198] 10, insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, IL10, IL11, and IL12 are provided with coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, CC10, CC11, and CC12, respectively. Hereinafter, coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, CC10, CC11, and CC12 will also be collectively referred to as coil conductors CC.

[0199] A coil 30C shown in FIG. 11 is configured by electrically connecting a plurality of coil conductors CC stacked together with insulating layers IL in the stacking direction (here, the height direction T).

[0200] 10 and 11, the length of the coil conductors CC excluding the coil conductors CC1, CC6, CC7, and CC12 is 7 / 8 of the turn of the coil 30C. Meanwhile, the length of the coil conductors CC1 and CC12 is 1 / 2 of the turn of the coil 30C, and the length of the coil conductors CC6 and CC7 is 3 / 4 of the turn of the coil 30C.

[0201] In the insulating layer IL12 of the twelfth layer L12, via conductors V12x and V12y are provided at both ends of the coil conductor CC12.

[0202] In the insulating layer IL11 of the eleventh layer L11, a via conductor V11x is provided at one end of the coil conductor CC11, and a via conductor V11y is provided at the bent portion of the coil conductor CC11.

[0203] In the insulating layer IL10 of the tenth layer L10, a via conductor V10x is provided on one side of the coil conductor CC10, and a via conductor V10y is provided at one end of the coil conductor CC10.

[0204] In the insulating layer IL9 of the ninth layer L9, a via conductor V9x is provided at one end of the coil conductor CC9, and a via conductor V9y is provided on one side of the coil conductor CC9.

[0205] In the insulating layer IL8 of the eighth layer L8, a via conductor V8x is provided at a bent portion of the coil conductor CC8, and a via conductor V8y is provided at one end of the coil conductor CC8.

[0206] In the insulating layer IL7 of the seventh layer L7, a via conductor V7x is provided at one end of the coil conductor CC7, and a via conductor V7y is provided at a bent portion of the coil conductor CC7.

[0207] In the insulating layer IL6 of the sixth layer L6, a via conductor V6x is provided at a bent portion of the coil conductor CC6, and a via conductor V6y is provided at one end of the coil conductor CC6.

[0208] In the insulating layer IL5 of the fifth layer L5, a via conductor V5x is provided at one end of the coil conductor CC5, and a via conductor V5y is provided at a bent portion of the coil conductor CC5.

[0209] In the insulating layer IL4 of the fourth layer L4, a via conductor V4x is provided on one side of the coil conductor CC4, and a via conductor V4y is provided at one end of the coil conductor CC4.

[0210] In the insulating layer IL3 of the third layer L3, a via conductor V3x is provided at one end of the coil conductor CC3, and a via conductor V3y is provided on one side of the coil conductor CC3.

[0211] In the insulating layer IL2 of the second layer L2, a via conductor V2x is provided at a bent portion of the coil conductor CC2, and a via conductor V2y is provided at one end of the coil conductor CC2.

[0212] Hereinafter, via conductors V2x, V2y, V3x, V3y, V4x, V4y, V5x, V5y, V6x, V6y, V7x, V7y, V8x, V8y, V9x, V9y, V10x, V10y, V11x, V11y, V12x and V12y will be collectively referred to as via conductors V.

[0213] 10 are stacked in the height direction T, the coil conductors CC are electrically connected through the via conductors V. As a result, a solenoid coil 30C having a coil axis extending in the height direction T is formed in the laminate 10C, as shown in FIG.

[0214] 10, an extension conductor 41 exposed at a first end surface of the laminate 10C is connected to an end of the coil conductor CC12 of the twelfth layer L12. The extension conductor 41 connects one of the external electrodes and the coil conductor CC12 within the laminate 10C.

[0215] Similarly, an extension conductor 42 exposed at a second end surface of the laminate 10C is connected to an end of the coil conductor CC1 of the first layer L1. The extension conductor 42 connects the other external electrode and the coil conductor CC1 within the laminate 10C.

[0216] The coil 30C includes a parallel section made up of two layers of coil conductors CC electrically connected in parallel through via conductors V. The parallel section includes a first parallel section and a second parallel section electrically connected in series to the first parallel section. Note that the number of parallel sections included in the coil 30C is not particularly limited.

[0217] In the example shown in FIG. 11, parallel portion P1f, parallel portion P2e, parallel portion P1e, parallel portion P2d, parallel portion P1d, parallel portion P2c, parallel portion P1c, parallel portion P2b, parallel portion P1b, parallel portion P2a, and parallel portion P1a are arranged from the negative direction to the positive direction in the height direction T. For example, parallel portion P1a is the first parallel portion, and parallel portion P2a is the second parallel portion. Note that the first parallel portion is not limited to parallel portion P1a, and may be any of parallel portions P1a, P1b, P1c, P1d, and P1e.

[0218] The parallel portion P1a is configured by electrically connecting in parallel the coil conductor CC12 of the twelfth layer L12 and part of the coil conductor CC11 of the eleventh layer L11 through via conductors V12x and V12y.

[0219] The parallel portion P2a is configured by electrically connecting in parallel a part of the coil conductor CC11 in the eleventh layer L11 and a part of the coil conductor CC10 in the tenth layer L10 through via conductors V11x and V11y.

[0220] The parallel portion P1b is configured by electrically connecting in parallel a part of the coil conductor CC10 in the tenth layer L10 and a part of the coil conductor CC9 in the ninth layer L9 through via conductors V10x and V10y.

[0221] The parallel portion P2b is configured by electrically connecting in parallel a part of the coil conductor CC9 of the ninth layer L9 and a part of the coil conductor CC8 of the eighth layer L8 through via conductors V9x and V9y.

[0222] The parallel portion P1c is configured by electrically connecting in parallel a part of the coil conductor CC8 of the eighth layer L8 and a part of the coil conductor CC7 of the seventh layer L7 through via conductors V8x and V8y.

[0223] The parallel portion P2c is configured by electrically connecting in parallel a part of the coil conductor CC7 in the seventh layer L7 and a part of the coil conductor CC6 in the sixth layer L6 through via conductors V7x and V7y.

[0224] The parallel portion P1d is configured by electrically connecting in parallel a part of the coil conductor CC6 of the sixth layer L6 and a part of the coil conductor CC5 of the fifth layer L5 through via conductors V6x and V6y.

[0225] The parallel portion P2d is configured by electrically connecting in parallel a part of the coil conductor CC5 of the fifth layer L5 and a part of the coil conductor CC4 of the fourth layer L4 through via conductors V5x and V5y.

[0226] The parallel portion P1e is configured by electrically connecting in parallel a part of the coil conductor CC4 of the fourth layer L4 and a part of the coil conductor CC3 of the third layer L3 through via conductors V4x and V4y.

[0227] The parallel portion P2e is configured by electrically connecting in parallel a part of the coil conductor CC3 of the third layer L3 and a part of the coil conductor CC2 of the second layer L2 through via conductors V3x and V3y.

[0228] The parallel portion P1f is configured by electrically connecting in parallel a part of the coil conductor CC2 of the second layer L2 and the coil conductor CC1 of the first layer L1 through via conductors V2x and V2y.

[0229] As shown in Figures 10 and 11, a portion of the coil conductor CC constituting the first parallel portion and a portion of the coil conductor CC constituting the second parallel portion are arranged so as to be directly connected on the same surface of the first insulating layer, which is the same insulating layer IL.

[0230] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, the insulating layer IL11 of the 11th layer L11 corresponds to the first insulating layer. In this case, a portion of the coil conductor CC11 that constitutes the parallel portion P1a and a portion of the coil conductor CC11 that constitutes the parallel portion P2a are arranged so as to be directly connected to each other on the same surface of the insulating layer IL11 of the 11th layer L11.

[0231] Furthermore, when adjacent coil conductors CC sandwiched between the first insulating layer are viewed from the stacking direction (here, the height direction T), at least a portion of adjacent coil conductors CC sandwiched between the first insulating layer overlaps, even in areas other than the parallel sections connected in parallel across the first insulating layer.

[0232] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, when the adjacent coil conductors CC11 and CC10 are sandwiched between the insulating layer IL11 of the 11th layer L11, which corresponds to the first insulating layer, and viewed from the height direction T, a portion of the coil conductor CC11 constituting the parallel portion P1a and a portion of the coil conductor CC10 constituting the parallel portion P1b overlap, in addition to the parallel portion P2a connected in parallel with the insulating layer IL11 sandwiched between them.

[0233] The parallel portion included in the coil 30C may further include a third parallel portion electrically connected in series to the second parallel portion. For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, then the parallel portion P1b is the third parallel portion.

[0234] As shown in Figures 10 and 11, it is preferable that a portion of the coil conductor CC constituting the second parallel portion and a portion of the coil conductor CC constituting the third parallel portion are arranged so as to be directly connected on the same surface of the second insulating layer, which is the same insulating layer IL.

[0235] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, the insulating layer IL10 of the tenth layer L10 corresponds to the second insulating layer. In this case, a portion of the coil conductor CC10 constituting the parallel portion P2a and a portion of the coil conductor CC10 constituting the parallel portion P1b are arranged so as to be directly connected on the same surface of the insulating layer IL10 of the tenth layer L10.

[0236] The parallel portion included in the coil 30C may further include a fourth parallel portion electrically connected in series to the third parallel portion. For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, then the parallel portion P2b is the fourth parallel portion.

[0237] As shown in Figures 10 and 11, it is preferable that a portion of the coil conductor CC constituting the third parallel portion and a portion of the coil conductor CC constituting the fourth parallel portion are arranged so as to be directly connected on the same surface of the third insulating layer, which is the same insulating layer IL.

[0238] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, the parallel portion P1b is the third parallel portion, and the parallel portion P2b is the fourth parallel portion, the insulating layer IL9 of the ninth layer L9 corresponds to the third insulating layer. In this case, a portion of the coil conductor CC9 that constitutes the parallel portion P1b and a portion of the coil conductor CC9 that constitutes the parallel portion P2b are arranged so as to be directly connected on the same surface of the insulating layer IL9 of the ninth layer L9.

[0239] In the example shown in FIG. 11, the ratio of the path of the first parallel portion to the path of one turn of the coil 30C is different from the ratio of the path of the second parallel portion to the path of one turn of the coil 30C.

[0240] As will be described below, when the planar shape of the coil 30C is rectangular, the ratio of the path of the parallel portion is calculated assuming that the planar shape is square.

[0241] FIG. 12-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30C shown in FIG.

[0242] The parallel portion P1a is L-shaped and includes a short side and a long side. The length of the parallel portion P1a is equal to the length of 1 / 2 of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P1a to the path of one turn of the coil 30C is 1 / 2 (0.5).

[0243] FIG. 12-2 is a plan view schematically illustrating the path of the parallel portion P2a included in the coil 30C shown in FIG.

[0244] The parallel portion P2a is L-shaped and includes a short side and half of a long side. The length of the parallel portion P2a is 3 / 8 of the length of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P2a to the path of one turn of the coil 30C is 3 / 8 (0.375).

[0245] FIG. 12-3 is a plan view schematically illustrating the path of the parallel portion P1b included in the coil 30C illustrated in FIG.

[0246] The parallel portion P1b has a U-shape that includes half of the long side and half of the short side. The length of the parallel portion P1b is the length of 1 / 2 of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P1b to the path of one turn of the coil 30C is 1 / 2 (0.5).

[0247] FIG. 12-4 is a plan view schematically illustrating the path of the parallel portion P2b included in the coil 30C illustrated in FIG.

[0248] The parallel portion P2b is L-shaped and includes half of the long side and the short side. The length of the parallel portion P2b is 3 / 8 of the length of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P2b to the path of one turn of the coil 30C is 3 / 8 (0.375).

[0249] FIG. 12-5 is a plan view schematically showing the path of the parallel portion P1c included in the coil 30C shown in FIG.

[0250] The parallel portion P1c has an L-shape including a long side and a short side. The length of the parallel portion P1c is equal to the length of 1 / 2 of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P1c to the path of one turn of the coil 30C is 1 / 2 (0.5).

[0251] FIG. 12-6 is a plan view schematically showing the path of the parallel portion P2c included in the coil 30C shown in FIG.

[0252] The parallel portion P2c has a straight line shape including the long side. The length of the parallel portion P2c is equal to the length of ¼ of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P2c to the path of one turn of the coil 30C is ¼ (0.25).

[0253] FIG. 12-7 is a plan view schematically showing the path of the parallel portion P1d included in the coil 30C shown in FIG.

[0254] The parallel portion P1d is L-shaped and includes a short side and a long side. The length of the parallel portion P1d is equal to the length of 1 / 2 of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P1d to the path of one turn of the coil 30C is 1 / 2 (0.5).

[0255] FIG. 12-8 is a plan view schematically showing the path of the parallel portion P2d included in the coil 30C shown in FIG.

[0256] The parallel portion P2d is L-shaped and includes a short side and half of a long side. The length of the parallel portion P2d is 3 / 8 of the length of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P2d to the path of one turn of the coil 30C is 3 / 8 (0.375).

[0257] FIG. 12-9 is a plan view schematically showing the path of the parallel portion P1e included in the coil 30C shown in FIG.

[0258] The parallel portion P1e has a U-shape that includes half of the long side and half of the short side. The length of the parallel portion P1e is the length of 1 / 2 of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P1e to the path of one turn of the coil 30C is 1 / 2 (0.5).

[0259] FIG. 12-10 is a plan view schematically showing the path of the parallel portion P2e included in the coil 30C shown in FIG.

[0260] The parallel portion P2e is L-shaped and includes half of the long side and the short side. The length of the parallel portion P2e is 3 / 8 of the length of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P2e to the path of one turn of the coil 30C is 3 / 8 (0.375).

[0261] FIG. 12-11 is a plan view schematically showing the path of the parallel portion P1f included in the coil 30C shown in FIG.

[0262] The parallel portion P1f is L-shaped with a long side and a short side. The length of the parallel portion P1f is equal to the length of 1 / 2 of the turn of the coil 30C. In other words, the ratio of the path of the parallel portion P1f to the path of one turn of the coil 30C is 1 / 2 (0.5).

[0263] 10 and 11, when parallel portion P1a is the first parallel portion and parallel portion P2a is the second parallel portion, the ratio of the path of the first parallel portion to the path of one turn of coil 30C (1 / 2) is different from the ratio of the path of the second parallel portion to the path of one turn of coil 30C (3 / 8).The same is true when parallel portion P1b, P1d, or P1e is the first parallel portion.

[0264] On the other hand, in the examples shown in Figures 10 and 11, when the parallel section P1c is the first parallel section and the parallel section P2c is the second parallel section, the ratio of the path of the first parallel section to the path of one turn of the coil 30C (1 / 2) is different from the ratio of the path of the second parallel section to the path of one turn of the coil 30C (1 / 4).

[0265] 10 and 11, when parallel portion P1a is the first parallel portion, parallel portion P2a is the second parallel portion, parallel portion P1b is the third parallel portion, and parallel portion P2b is the fourth parallel portion, the ratio of the path of the first parallel portion to the path of one turn of coil 30C is the same (1 / 2) as the ratio of the path of the third parallel portion to the path of one turn of coil 30C, and the ratio of the path of the second parallel portion to the path of one turn of coil 30C is the same (3 / 8).The same is true when parallel portion P1d is the first parallel portion, parallel portion P2d is the second parallel portion, parallel portion P1e is the third parallel portion, and parallel portion P2e is the fourth parallel portion.

[0266] 10 and 11, when parallel portion P1b is the first parallel portion, parallel portion P2b is the second parallel portion, parallel portion P1c is the third parallel portion, and parallel portion P2c is the fourth parallel portion, the ratio of the path of the first parallel portion to the path of one turn of coil 30C is the same as the ratio of the path of the third parallel portion to the path of one turn of coil 30C (1 / 2), while the ratio of the path of the second parallel portion to the path of one turn of coil 30C is different from the ratio of the path of the fourth parallel portion to the path of one turn of coil 30C (3 / 8 and 1 / 4).The same is true when parallel portion P1c is the first parallel portion, parallel portion P2c is the second parallel portion, parallel portion P1d is the third parallel portion, and parallel portion P2d is the fourth parallel portion.

[0267] [Fourth embodiment] In the laminated coil component according to the fourth embodiment of the present invention, the ratio of the paths of the first parallel section to the paths of one turn of the coil is different from the ratio of the paths of the third parallel section to the paths of one turn of the coil, and the ratio of the paths of the second parallel section to the paths of one turn of the coil is different from the ratio of the paths of the fourth parallel section to the paths of one turn of the coil. The laminated coil component according to the fourth embodiment of the present invention is required to include at least one set of first parallel section, second parallel section, third parallel section, and fourth parallel section that satisfy the above relationship.

[0268] Fig. 13 is a plan view schematically showing an example of a laminate constituting a laminated coil component according to a fourth embodiment of the present invention, and Fig. 14 is an exploded perspective view of a coil built in the laminate shown in Fig. 13.

[0269] The laminate 10D shown in FIG. 13 includes a built-in coil 30D shown in FIG.

[0270] 13, similar to the laminate 10A shown in Fig. 2, the laminate 10D is configured by stacking a plurality of insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, IL10, IL11, and IL12 in the height direction T from the first main surface toward the second main surface of the laminate 10D. Hereinafter, the insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, IL10, IL11, and IL12 will also be collectively referred to as insulating layers IL.

[0271] 13, insulating layers IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, IL10, IL11, and IL12 are provided with coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, CC10, CC11, and CC12, respectively. Hereinafter, coil conductors CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, CC10, CC11, and CC12 will also be collectively referred to as coil conductors CC.

[0272] A coil 30D shown in FIG. 14 is configured by electrically connecting a plurality of coil conductors CC stacked together with insulating layers IL in the stacking direction (here, the height direction T).

[0273] 13 and 14, the length of the coil conductors CC excluding the coil conductors CC1, CC2, CC5, CC8, CC11, and CC12 is 7 / 8 of the turn of the coil 30D. Meanwhile, the length of the coil conductors CC1 and CC12 is 5 / 8 of the turn of the coil 30D, and the length of the coil conductors CC2, CC5, CC8, and CC11 is 3 / 4 of the turn of the coil 30D.

[0274] In the insulating layer IL12 of the twelfth layer L12, via conductors V12x and V12y are provided at both ends of the coil conductor CC12.

[0275] In the insulating layer IL11 of the eleventh layer L11, a via conductor V11x is provided at one end of the coil conductor CC11, and a via conductor V11y is provided on one side of the coil conductor CC11.

[0276] In the insulating layer IL10 of the tenth layer L10, a via conductor V10x is provided at a bent portion of the coil conductor CC10, and a via conductor V10y is provided at one end of the coil conductor CC10.

[0277] In the insulating layer IL9 of the ninth layer L9, a via conductor V9x is provided at one end of the coil conductor CC9, and a via conductor V9y is provided at a bent portion of the coil conductor CC9.

[0278] In the insulating layer IL8 of the eighth layer L8, via conductors V8x are provided on the sides of the coil conductor CC8, and a via conductor V8y is provided at one end of the coil conductor CC8.

[0279] In the insulating layer IL7 of the seventh layer L7, a via conductor V7x is provided at one end of the coil conductor CC7, and a via conductor V7y is provided at a bent portion of the coil conductor CC7.

[0280] In the insulating layer IL6 of the sixth layer L6, a via conductor V6x is provided at a bent portion of the coil conductor CC6, and a via conductor V6y is provided at one end of the coil conductor CC6.

[0281] In the insulating layer IL5 of the fifth layer L5, a via conductor V5x is provided at one end of the coil conductor CC5, and a via conductor V5y is provided on one side of the coil conductor CC5.

[0282] In the insulating layer IL4 of the fourth layer L4, a via conductor V4x is provided at a bent portion of the coil conductor CC4, and a via conductor V4y is provided at one end of the coil conductor CC4.

[0283] In the insulating layer IL3 of the third layer L3, a via conductor V3x is provided at one end of the coil conductor CC3, and a via conductor V3y is provided at a bent portion of the coil conductor CC3.

[0284] In the insulating layer IL2 of the second layer L2, a via conductor V2x is provided on one side of the coil conductor CC2, and a via conductor V2y is provided at one end of the coil conductor CC2.

[0285] Hereinafter, via conductors V2x, V2y, V3x, V3y, V4x, V4y, V5x, V5y, V6x, V6y, V7x, V7y, V8x, V8y, V9x, V9y, V10x, V10y, V11x, V11y, V12x and V12y will be collectively referred to as via conductors V.

[0286] 13 are stacked in the height direction T, the coil conductors CC are electrically connected through the via conductors V. As a result, a solenoid coil 30D having a coil axis extending in the height direction T is formed in the laminate 10D, as shown in FIG.

[0287] 13, an extension conductor 41 exposed at a first end surface of the laminate 10D is connected to an end of the coil conductor CC12 of the twelfth layer L12. The extension conductor 41 connects one of the external electrodes and the coil conductor CC12 within the laminate 10D.

[0288] Similarly, an extension conductor 42 exposed at a second end surface of the laminate 10D is connected to an end of the coil conductor CC1 of the first layer L1. The extension conductor 42 connects the other external electrode and the coil conductor CC1 within the laminate 10D.

[0289] The coil 30D includes a parallel portion composed of two layers of coil conductors CC electrically connected in parallel through via conductors V. The parallel portion includes a first parallel portion and a second parallel portion electrically connected in series to the first parallel portion. Note that the number of parallel portions included in the coil 30D is not particularly limited.

[0290] In the example shown in FIG. 14, parallel portion P1f, parallel portion P2e, parallel portion P1e, parallel portion P2d, parallel portion P1d, parallel portion P2c, parallel portion P1c, parallel portion P2b, parallel portion P1b, parallel portion P2a, and parallel portion P1a are arranged from the negative direction to the positive direction in the height direction T. For example, parallel portion P1a is the first parallel portion, and parallel portion P2a is the second parallel portion. Note that the first parallel portion is not limited to parallel portion P1a, and may be any of parallel portions P1a, P1b, P1c, P1d, and P1e.

[0291] The parallel portion P1a is configured by electrically connecting in parallel the coil conductor CC12 of the twelfth layer L12 and part of the coil conductor CC11 of the eleventh layer L11 through via conductors V12x and V12y.

[0292] The parallel portion P2a is configured by electrically connecting in parallel a part of the coil conductor CC11 in the eleventh layer L11 and a part of the coil conductor CC10 in the tenth layer L10 through via conductors V11x and V11y.

[0293] The parallel portion P1b is configured by electrically connecting in parallel a part of the coil conductor CC10 in the tenth layer L10 and a part of the coil conductor CC9 in the ninth layer L9 through via conductors V10x and V10y.

[0294] The parallel portion P2b is configured by electrically connecting in parallel a part of the coil conductor CC9 of the ninth layer L9 and a part of the coil conductor CC8 of the eighth layer L8 through via conductors V9x and V9y.

[0295] The parallel portion P1c is configured by electrically connecting in parallel a part of the coil conductor CC8 of the eighth layer L8 and a part of the coil conductor CC7 of the seventh layer L7 through via conductors V8x and V8y.

[0296] The parallel portion P2c is configured by electrically connecting in parallel a part of the coil conductor CC7 in the seventh layer L7 and a part of the coil conductor CC6 in the sixth layer L6 through via conductors V7x and V7y.

[0297] The parallel portion P1d is configured by electrically connecting in parallel a part of the coil conductor CC6 of the sixth layer L6 and a part of the coil conductor CC5 of the fifth layer L5 through via conductors V6x and V6y.

[0298] The parallel portion P2d is configured by electrically connecting in parallel a part of the coil conductor CC5 of the fifth layer L5 and a part of the coil conductor CC4 of the fourth layer L4 through via conductors V5x and V5y.

[0299] The parallel portion P1e is configured by electrically connecting in parallel a part of the coil conductor CC4 of the fourth layer L4 and a part of the coil conductor CC3 of the third layer L3 through via conductors V4x and V4y.

[0300] The parallel portion P2e is configured by electrically connecting in parallel a part of the coil conductor CC3 of the third layer L3 and a part of the coil conductor CC2 of the second layer L2 through via conductors V3x and V3y.

[0301] The parallel portion P1f is configured by electrically connecting in parallel a part of the coil conductor CC2 of the second layer L2 and the coil conductor CC1 of the first layer L1 through via conductors V2x and V2y.

[0302] As shown in Figures 13 and 14, a portion of the coil conductor CC constituting the first parallel portion and a portion of the coil conductor CC constituting the second parallel portion are arranged so as to be directly connected on the same surface of the first insulating layer, which is the same insulating layer IL.

[0303] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, the insulating layer IL11 of the 11th layer L11 corresponds to the first insulating layer. In this case, a portion of the coil conductor CC11 that constitutes the parallel portion P1a and a portion of the coil conductor CC11 that constitutes the parallel portion P2a are arranged so as to be directly connected to each other on the same surface of the insulating layer IL11 of the 11th layer L11.

[0304] Furthermore, when adjacent coil conductors CC sandwiched between the first insulating layer are viewed from the stacking direction (here, the height direction T), at least a portion of adjacent coil conductors CC sandwiched between the first insulating layer overlaps, even in areas other than the parallel sections connected in parallel across the first insulating layer.

[0305] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, when the adjacent coil conductors CC11 and CC10 are sandwiched between the insulating layer IL11 of the 11th layer L11, which corresponds to the first insulating layer, and viewed from the height direction T, a portion of the coil conductor CC11 constituting the parallel portion P1a and a portion of the coil conductor CC10 constituting the parallel portion P1b overlap, in addition to the parallel portion P2a connected in parallel with the insulating layer IL11 sandwiched between them.

[0306] The parallel portion included in the coil 30D may further include a third parallel portion electrically connected in series to the second parallel portion. For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, then the parallel portion P1b is the third parallel portion.

[0307] As shown in Figures 13 and 14, it is preferable that a portion of the coil conductor CC constituting the second parallel portion and a portion of the coil conductor CC constituting the third parallel portion are arranged so as to be directly connected on the same surface of the second insulating layer, which is the same insulating layer IL.

[0308] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, the insulating layer IL10 of the tenth layer L10 corresponds to the second insulating layer. In this case, a portion of the coil conductor CC10 constituting the parallel portion P2a and a portion of the coil conductor CC10 constituting the parallel portion P1b are arranged so as to be directly connected on the same surface of the insulating layer IL10 of the tenth layer L10.

[0309] The parallel portion included in the coil 30D may further include a fourth parallel portion electrically connected in series to the third parallel portion. For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, then the parallel portion P2b is the fourth parallel portion.

[0310] As shown in Figures 13 and 14, it is preferable that a portion of the coil conductor CC constituting the third parallel portion and a portion of the coil conductor CC constituting the fourth parallel portion are arranged so as to be directly connected on the same surface of the third insulating layer, which is the same insulating layer IL.

[0311] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, the parallel portion P1b is the third parallel portion, and the parallel portion P2b is the fourth parallel portion, the insulating layer IL9 of the ninth layer L9 corresponds to the third insulating layer. In this case, a portion of the coil conductor CC9 that constitutes the parallel portion P1b and a portion of the coil conductor CC9 that constitutes the parallel portion P2b are arranged so as to be directly connected on the same surface of the insulating layer IL9 of the ninth layer L9.

[0312] In the example shown in FIG. 14, the ratio of the path of the first parallel portion to the path of one turn of the coil 30D is different from the ratio of the path of the second parallel portion to the path of one turn of the coil 30D.

[0313] As will be described below, when the planar shape of the coil 30D is rectangular, the ratio of the path of the parallel portion is calculated assuming that the planar shape is square.

[0314] FIG. 15-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30D shown in FIG.

[0315] The parallel portion P1a has a U-shape that includes a long side, a short side, and half of the long side. The length of the parallel portion P1a is 5 / 8 of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P1a to the path of one turn of the coil 30D is 5 / 8 (0.625).

[0316] FIG. 15-2 is a plan view schematically showing the path of the parallel portion P2a included in the coil 30D shown in FIG.

[0317] The parallel portion P2a is a straight line that includes half of the long side. The length of the parallel portion P2a is 1 / 8 of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P2a to the path of one turn of the coil 30D is 1 / 8 (0.125).

[0318] FIG. 15-3 is a plan view schematically showing the path of the parallel portion P1b included in the coil 30D shown in FIG.

[0319] The parallel portion P1b has a U-shape including a short side, a long side, and another short side. The length of the parallel portion P1b is 3 / 4 of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P1b to the path of one turn of the coil 30D is 3 / 4 (0.75).

[0320] FIG. 15-4 is a plan view schematically showing the path of the parallel portion P2b included in the coil 30D shown in FIG.

[0321] The parallel portion P2b is a straight line that includes half of the long side. The length of the parallel portion P2b is 1 / 8 of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P2b to the path of one turn of the coil 30D is 1 / 8 (0.125).

[0322] FIG. 15-5 is a plan view schematically showing the path of the parallel portion P1c included in the coil 30D shown in FIG.

[0323] The parallel portion P1c has a U-shape that includes half of the long side, the short side, and the long side. The length of the parallel portion P1c is 5 / 8 of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P1c to the path of one turn of the coil 30D is 5 / 8 (0.625).

[0324] FIG. 15-6 is a plan view schematically showing the path of the parallel portion P2c included in the coil 30D shown in FIG.

[0325] The parallel portion P2c has a straight line shape including a short side. The length of the parallel portion P2c is ¼ of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P2c to the path of one turn of the coil 30D is ¼ (0.25).

[0326] FIG. 15-7 is a plan view schematically showing the path of the parallel portion P1d included in the coil 30D shown in FIG.

[0327] The parallel portion P1d has an angular U-shape that includes a long side, a short side, and half of the long side. The length of the parallel portion P1d is 5 / 8 of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P1d to the path of one turn of the coil 30D is 5 / 8 (0.625).

[0328] FIG. 15-8 is a plan view schematically showing the path of the parallel portion P2d included in the coil 30D shown in FIG.

[0329] The parallel portion P2d is a straight line that includes half of the long side. The length of the parallel portion P2d is 1 / 8 of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P2d to the path of one turn of the coil 30D is 1 / 8 (0.125).

[0330] FIG. 15-9 is a plan view schematically showing the path of the parallel portion P1e included in the coil 30D shown in FIG.

[0331] The parallel portion P1e has a U-shape including a short side, a long side, and another short side. The length of the parallel portion P1e is the length of 3 / 4 of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P1e to the path of one turn of the coil 30D is 3 / 4 (0.75).

[0332] FIG. 15-10 is a plan view schematically showing the path of the parallel portion P2e included in the coil 30D shown in FIG.

[0333] The parallel portion P2e is a straight line that includes half of the long side. The length of the parallel portion P2e is 1 / 8 of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P2e to the path of one turn of the coil 30D is 1 / 8 (0.125).

[0334] FIG. 15-11 is a plan view schematically showing the path of the parallel portion P1f included in the coil 30D shown in FIG.

[0335] The parallel portion P1f has an angular U-shape that includes half of the long side, the short side, and the long side. The length of the parallel portion P1f is 5 / 8 of the length of the turn of the coil 30D. In other words, the ratio of the path of the parallel portion P1f to the path of one turn of the coil 30D is 5 / 8 (0.625).

[0336] 13 and 14, when parallel portion P1a is the first parallel portion and parallel portion P2a is the second parallel portion, the ratio of the path of the first parallel portion to the path of one turn of coil 30D (5 / 8) is different from the ratio of the path of the second parallel portion to the path of one turn of coil 30D (1 / 8).The same is true when parallel portion P1d is the first parallel portion.

[0337] 13 and 14, when parallel portion P1b is the first parallel portion and parallel portion P2b is the second parallel portion, the ratio of the path of the first parallel portion to the path of one turn of coil 30D (3 / 4) is different from the ratio of the path of the second parallel portion to the path of one turn of coil 30D (1 / 8).The same is true when parallel portion P1e is the first parallel portion.

[0338] Furthermore, in the examples shown in Figures 13 and 14, when the parallel section P1c is the first parallel section and the parallel section P2c is the second parallel section, the ratio of the path of the first parallel section to the path of one turn of coil 30D (5 / 8) is different from the ratio of the path of the second parallel section to the path of one turn of coil 30D (1 / 4).

[0339] 13 and 14, when parallel portion P1a is the first parallel portion, parallel portion P2a is the second parallel portion, parallel portion P1b is the third parallel portion, and parallel portion P2b is the fourth parallel portion, the ratio of the path of the first parallel portion to the path of one turn of coil 30D is different from the ratio of the path of the third parallel portion to the path of one turn of coil 30D (5 / 8 and 3 / 4), and the ratio of the path of the second parallel portion to the path of one turn of coil 30D is the same as the ratio of the path of the fourth parallel portion to the path of one turn of coil 30D (1 / 8). The same is true when parallel portion P1d is the first parallel portion, parallel portion P2d is the second parallel portion, parallel portion P1e is the third parallel portion, and parallel portion P2e is the fourth parallel portion.

[0340] On the other hand, in the example shown in Figures 13 and 14, when parallel section P1b is the first parallel section, parallel section P2b is the second parallel section, parallel section P1c is the third parallel section, and parallel section P2c is the fourth parallel section, the ratio of the path of the first parallel section to the path of one turn of coil 30D is different from the ratio of the path of the third parallel section to the path of one turn of coil 30D (3 / 4 and 5 / 8), and the ratio of the path of the second parallel section to the path of one turn of coil 30D is different from the ratio of the path of the fourth parallel section to the path of one turn of coil 30D (1 / 8 and 1 / 4).

[0341] Furthermore, in the example shown in Figures 13 and 14, when parallel section P1c is the first parallel section, parallel section P2c is the second parallel section, parallel section P1d is the third parallel section, and parallel section P2d is the fourth parallel section, the ratio of the path of the first parallel section to the path of one turn of coil 30D is the same as the ratio of the path of the third parallel section to the path of one turn of coil 30D (5 / 8), and the ratio of the path of the second parallel section to the path of one turn of coil 30D is different from the ratio of the path of the fourth parallel section to the path of one turn of coil 30D (1 / 4 and 1 / 8).

[0342] [Fifth embodiment] The laminated coil component according to the fifth embodiment of the present invention is a modified example of the laminated coil component according to the second embodiment of the present invention.

[0343] Fig. 16 is a plan view schematically showing an example of a laminate constituting the laminate coil component according to the fifth embodiment of the present invention, and Fig. 17 is an exploded perspective view of a coil built in the laminate shown in Fig. 16.

[0344] The laminate 10E shown in FIG. 16 incorporates a coil 30E shown in FIG.

[0345] 16, similar to the laminate 10A shown in Fig. 2, the laminate 10E is configured by stacking a plurality of insulating layers IL1, IL2, IL3, IL4, IL5, and IL6 in the height direction T from the first main surface toward the second main surface of the laminate 10E. Hereinafter, the insulating layers IL1, IL2, IL3, IL4, IL5, and IL6 will also be collectively referred to as insulating layers IL.

[0346] 16, coil conductors CC1, CC2, CC3, CC4, CC5, and CC6 are provided on insulating layers IL1, IL2, IL3, IL4, IL5, and IL6, respectively. Hereinafter, coil conductors CC1, CC2, CC3, CC4, CC5, and CC6 will also be collectively referred to as coil conductors CC.

[0347] A coil 30E shown in FIG. 17 is configured by electrically connecting a plurality of coil conductors CC stacked together with insulating layers IL in the stacking direction (here, the height direction T).

[0348] 16 and 17, the length of the coil conductors CC excluding the coil conductors CC1 and CC6 is 7 / 8 of the turn of the coil 30E, while the length of the coil conductors CC1 and CC6 is 3 / 4 of the turn of the coil 30E.

[0349] In the insulating layer IL6 of the sixth layer L6, via conductors V6x and V6y are provided at both ends of the coil conductor CC6.

[0350] In the insulating layer IL5 of the fifth layer L5, a via conductor V5x is provided at one end of the coil conductor CC5, and a via conductor V5y is provided at a bent portion of the coil conductor CC5.

[0351] In the insulating layer IL4 of the fourth layer L4, a via conductor V4x is provided on one side of the coil conductor CC4, and a via conductor V4y is provided at one end of the coil conductor CC4.

[0352] In the insulating layer IL3 of the third layer L3, a via conductor V3x is provided at one end of the coil conductor CC3, and a via conductor V3y is provided on one side of the coil conductor CC3.

[0353] In the insulating layer IL2 of the second layer L2, a via conductor V2x is provided at a bent portion of the coil conductor CC2, and a via conductor V2y is provided at one end of the coil conductor CC2.

[0354] Hereinafter, the via conductors V2x, V2y, V3x, V3y, V4x, V4y, V5x, V5y, V6x, and V6y will also be collectively referred to as via conductors V.

[0355] 16 are stacked in the height direction T, the coil conductors CC are electrically connected through the via conductors V. As a result, a solenoid coil 30E having a coil axis extending in the height direction T is formed in the laminate 10E, as shown in FIG.

[0356] 16, an extension conductor 41 exposed at a first end face of the laminate 10E is connected to an end of the coil conductor CC6 of the sixth layer L6. The extension conductor 41 connects one of the external electrodes and the coil conductor CC6 within the laminate 10E.

[0357] Similarly, an extension conductor 42 exposed at a second end surface of the laminate 10E is connected to an end of the coil conductor CC1 of the first layer L1. The extension conductor 42 connects the other external electrode and the coil conductor CC1 within the laminate 10E.

[0358] The coil 30E includes a parallel section made up of two layers of coil conductors CC electrically connected in parallel through via conductors V. The parallel section includes a first parallel section and a second parallel section electrically connected in series to the first parallel section. Note that the number of parallel sections included in the coil 30E is not particularly limited.

[0359] In the example shown in Fig. 17, parallel portion P1c, parallel portion P2b, parallel portion P1b, parallel portion P2a, and parallel portion P1a are arranged from the negative direction to the positive direction in the height direction T. For example, parallel portion P1a is the first parallel portion, and parallel portion P2a is the second parallel portion. Note that the first parallel portion is not limited to parallel portion P1a, and may be either parallel portion P1a or P1b.

[0360] The parallel portion P1a is configured by electrically connecting in parallel the coil conductor CC6 of the sixth layer L6 and a part of the coil conductor CC5 of the fifth layer L5 through via conductors V6x and V6y.

[0361] The parallel portion P2a is configured by electrically connecting in parallel a part of the coil conductor CC5 of the fifth layer L5 and a part of the coil conductor CC4 of the fourth layer L4 through via conductors V5x and V5y.

[0362] The parallel portion P1b is configured by electrically connecting in parallel a part of the coil conductor CC4 of the fourth layer L4 and a part of the coil conductor CC3 of the third layer L3 through via conductors V4x and V4y.

[0363] The parallel portion P2b is configured by electrically connecting in parallel a part of the coil conductor CC3 on the third layer L3 and a part of the coil conductor CC2 on the second layer L2 through via conductors V3x and V3y.

[0364] The parallel portion P1c is configured by electrically connecting in parallel a part of the coil conductor CC2 of the second layer L2 and the coil conductor CC1 of the first layer L1 through via conductors V2x and V2y.

[0365] As shown in Figures 16 and 17, a portion of the coil conductor CC constituting the first parallel portion and a portion of the coil conductor CC constituting the second parallel portion are arranged so as to be directly connected on the same surface of the first insulating layer, which is the same insulating layer IL.

[0366] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, the insulating layer IL5 of the fifth layer L5 corresponds to the first insulating layer. In this case, a portion of the coil conductor CC5 that constitutes the parallel portion P1a and a portion of the coil conductor CC5 that constitutes the parallel portion P2a are arranged so as to be directly connected on the same surface of the insulating layer IL5 of the fifth layer L5.

[0367] Furthermore, when adjacent coil conductors CC sandwiched between the first insulating layer are viewed from the stacking direction (here, the height direction T), at least a portion of adjacent coil conductors CC sandwiched between the first insulating layer overlaps, even in areas other than the parallel sections connected in parallel across the first insulating layer.

[0368] For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, when the adjacent coil conductors CC5 and CC4 are sandwiched between the insulating layer IL5 of the fifth layer L5, which corresponds to the first insulating layer, and viewed from the height direction T, a portion of the coil conductor CC5 constituting the parallel portion P1a overlaps with a portion of the coil conductor CC4 constituting the parallel portion P1b, in addition to the parallel portion P2a connected in parallel with the insulating layer IL5 sandwiched between them.

[0369] The parallel portion included in the coil 30E may further include a third parallel portion electrically connected in series to the second parallel portion. For example, if the parallel portion P1a is the first parallel portion and the parallel portion P2a is the second parallel portion, the parallel portion P1b is the third parallel portion.

[0370] As shown in Figures 16 and 17, it is preferable that a portion of the coil conductor CC constituting the second parallel portion and a portion of the coil conductor CC constituting the third parallel portion are arranged so as to be directly connected on the same surface of the second insulating layer, which is the same insulating layer IL.

[0371] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, the insulating layer IL4 of the fourth layer L4 corresponds to the second insulating layer. In this case, a portion of the coil conductor CC4 that constitutes the parallel portion P2a and a portion of the coil conductor CC4 that constitutes the parallel portion P1b are arranged so as to be directly connected on the same surface of the insulating layer IL4 of the fourth layer L4.

[0372] The parallel portion included in the coil 30E may further include a fourth parallel portion electrically connected in series to the third parallel portion. For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, and the parallel portion P1b is the third parallel portion, then the parallel portion P2b is the fourth parallel portion.

[0373] As shown in Figures 16 and 17, it is preferable that a portion of the coil conductor CC constituting the third parallel portion and a portion of the coil conductor CC constituting the fourth parallel portion are arranged so as to be directly connected on the same surface of the third insulating layer, which is the same insulating layer IL.

[0374] For example, if the parallel portion P1a is the first parallel portion, the parallel portion P2a is the second parallel portion, the parallel portion P1b is the third parallel portion, and the parallel portion P2b is the fourth parallel portion, the insulating layer IL3 of the third layer L3 corresponds to the third insulating layer. In this case, a portion of the coil conductor CC3 constituting the parallel portion P1b and a portion of the coil conductor CC3 constituting the parallel portion P2b are arranged so as to be directly connected on the same surface of the insulating layer IL3 of the third layer L3.

[0375] In the example shown in FIG. 17, the ratio of the path of the first parallel portion to the path of one turn of the coil 30E is different from the ratio of the path of the second parallel portion to the path of one turn of the coil 30E.

[0376] As will be described below, when the planar shape of the coil 30E is rectangular, the ratio of the path of the parallel portion is calculated assuming that the planar shape is square.

[0377] FIG. 18-1 is a plan view schematically showing the path of the parallel portion P1a included in the coil 30E shown in FIG.

[0378] The parallel portion P1a has a U-shape including a short side, a long side, and another short side. The length of the parallel portion P1a is 3 / 4 of the length of the turn of the coil 30E. In other words, the ratio of the path of the parallel portion P1a to the path of one turn of the coil 30E is 3 / 4 (0.75).

[0379] FIG. 18-2 is a plan view schematically showing the path of the parallel portion P2a included in the coil 30E shown in FIG.

[0380] The parallel portion P2a is a straight line that includes half of the long side. The length of the parallel portion P2a is 1 / 8 of the length of the turn of the coil 30E. In other words, the ratio of the path of the parallel portion P2a to the path of one turn of the coil 30E is 1 / 8 (0.125).

[0381] FIG. 18-3 is a plan view schematically showing the path of the parallel portion P1b included in the coil 30E shown in FIG.

[0382] The parallel portion P1b has a shape that includes half of the long side, a short side, a long side, and half of the short side. The length of the parallel portion P1b is 3 / 4 of the length of the turn of the coil 30E. In other words, the ratio of the path of the parallel portion P1b to the path of one turn of the coil 30E is 3 / 4 (0.75).

[0383] FIG. 18-4 is a plan view schematically showing the path of the parallel portion P2b included in the coil 30E shown in FIG.

[0384] The parallel portion P2b is a straight line that includes half of the short side. The length of the parallel portion P2b is 1 / 8 of the length of the turn of the coil 30E. In other words, the ratio of the path of the parallel portion P2b to the path of one turn of the coil 30E is 1 / 8 (0.125).

[0385] FIG. 18-5 is a plan view schematically showing the path of the parallel portion P1c included in the coil 30E shown in FIG.

[0386] The parallel portion P1c has a U-shape including a long side, a short side, and another long side. The length of the parallel portion P1c is 3 / 4 of the length of the turn of the coil 30E. In other words, the ratio of the path of the parallel portion P1c to the path of one turn of the coil 30E is 3 / 4 (0.75).

[0387] Thus, in the examples shown in Figures 16 and 17, for example, if the parallel section P1a is the first parallel section and the parallel section P2a is the second parallel section, the ratio of the path of the first parallel section to the path of one turn of the coil 30E (3 / 4) is different from the ratio of the path of the second parallel section to the path of one turn of the coil 30E (1 / 8).

[0388] Furthermore, in the examples shown in Figures 16 and 17, for example, if parallel section P1a is the first parallel section, parallel section P2a is the second parallel section, parallel section P1b is the third parallel section, and parallel section P2b is the fourth parallel section, the ratio of the path of the first parallel section to the path of one turn of coil 30E is the same (3 / 4) as the ratio of the path of the third parallel section to the path of one turn of coil 30E, and the ratio of the path of the second parallel section to the path of one turn of coil 30E is the same (1 / 8).

[0389] [Other embodiments] The multilayer coil component of the present invention is not limited to the above embodiment, as long as a portion of the coil conductors constituting the first parallel section and a portion of the coil conductors constituting the second parallel section are arranged so as to be directly connected on the same surface of the same insulating layer, and as long as adjacent coil conductors sandwiching the first insulating layer at least partially overlap when viewed from the stacking direction, even in areas other than the parallel section connected in parallel with the first insulating layer in between. Therefore, various applications and modifications can be made within the scope of the present invention regarding the configuration, manufacturing conditions, etc. of the multilayer coil component.

[0390] FIG. 19 is a development view schematically showing an example of a coil constituting a laminated coil component according to another embodiment of the present invention.

[0391] As shown in Figure 19, when the first parallel section P1 and the second parallel section P2 are each composed of three layers of coil conductors, if a portion of the coil conductor CC constituting the first parallel section P1 and a portion of the coil conductor CC constituting the second parallel section P2 are arranged on the same insulating layer (not shown), the maximum number of via conductors V that overlap consecutively in the stacking direction is three.

[0392] FIG. 20 is a development view that schematically shows another example of a coil that constitutes a conventional laminated coil component.

[0393] As shown in Figure 20, when the first parallel section P1 and the second parallel section P2 are each composed of three layers of coil conductors, if a portion of the coil conductors CC constituting the first parallel section P1 and a portion of the coil conductors CC constituting the second parallel section P2 are not arranged on the same insulating layer (not shown), the maximum number of via conductors V that overlap consecutively in the stacking direction is five.

[0394] Comparing Figures 19 and 20, by arranging a portion of the coil conductor CC constituting the first parallel section P1 and a portion of the coil conductor CC constituting the second parallel section P2 on the same insulating layer, the number of via conductors V overlapping in the stacking direction can be reduced.

[0395] The present specification discloses the following:

[0396] <1> a laminate in which a plurality of insulating layers are stacked in a stacking direction and a coil is built in; an external electrode provided on an outer surface of the laminate and electrically connected to the coil; the coil is configured by electrically connecting a plurality of coil conductors stacked together with the insulating layers in the stacking direction, the coil includes a parallel portion formed of two or more layers of the coil conductors electrically connected in parallel through via conductors; the parallel section includes a first parallel section and a second parallel section electrically connected in series to the first parallel section; a portion of the coil conductor constituting the first parallel portion and a portion of the coil conductor constituting the second parallel portion are arranged so as to be directly connected to each other on the same surface of the first insulating layer, which is the same insulating layer; when the coil conductors adjacent to each other with the first insulating layer sandwiched therebetween are viewed in the stacking direction, at least a portion of the coil conductors adjacent to each other with the first insulating layer sandwiched therebetween overlap with each other even in a portion other than a parallel portion connected in parallel with the first insulating layer sandwiched therebetween.

[0397] <2> a ratio of the path of the first parallel section to the path of one turn of the coil is different from a ratio of the path of the second parallel section to the path of one turn of the coil; <1> The laminated coil component according to claim 1.

[0398] <3> the parallel section further includes a third parallel section electrically connected in series to the second parallel section; a portion of the coil conductor constituting the second parallel portion and a portion of the coil conductor constituting the third parallel portion are arranged so as to be directly connected to each other on the same surface of the second insulating layer, which is the same insulating layer; <1> or <2> The laminated coil component according to claim 1.

[0399] <4> the parallel section further includes a fourth parallel section electrically connected in series to the third parallel section; a portion of the coil conductor constituting the third parallel portion and a portion of the coil conductor constituting the fourth parallel portion are arranged so as to be directly connected to each other on the same surface of the third insulating layer, which is the same insulating layer; <3> The laminated coil component according to claim 1.

[0400] <5> a ratio of the path of the first parallel section to the path of one turn of the coil is different from a ratio of the path of the second parallel section to the path of one turn of the coil, a ratio of the path of the third parallel section to the path of one turn of the coil is different from a ratio of the path of the fourth parallel section to the path of one turn of the coil; <4> The laminated coil component according to claim 1.

[0401] <6> a ratio of the path of the first parallel section to the path of one turn of the coil is the same as a ratio of the path of the third parallel section to the path of one turn of the coil, a ratio of the path of the second parallel section to the path of one turn of the coil is the same as a ratio of the path of the fourth parallel section to the path of one turn of the coil; <5> The laminated coil component according to claim 1.

[0402] <7> a ratio of the path of the first parallel section to the path of one turn of the coil is the same as a ratio of the path of the third parallel section to the path of one turn of the coil, a ratio of the path of the second parallel section to the path of one turn of the coil is different from a ratio of the path of the fourth parallel section to the path of one turn of the coil; <5> The laminated coil component according to claim 1.

[0403] <8> a ratio of the path of the first parallel section to the path of one turn of the coil is different from a ratio of the path of the third parallel section to the path of one turn of the coil, a ratio of the path of the second parallel section to the path of one turn of the coil is different from a ratio of the path of the fourth parallel section to the path of one turn of the coil; <5> The laminated coil component according to claim 1.

[0404] <9> a ratio of the path of the first parallel section to the path of one turn of the coil is 0.4 or more and 0.8 or less, and a ratio of the path of the second parallel section to the path of one turn of the coil is 0.1 or more and less than 0.4; <2> , <5> , <6> , <7> or <8> The laminated coil component according to claim 1.

[0405] <10> At least one of the via conductors is connected to a side of the coil conductor other than the bent portion. <1> ~ <9> 10. The laminated coil component according to claim 9, wherein the first and second laminated coil components are arranged in a direction perpendicular to the plane of the sheet.

[0406] <11> each of the parallel portions including the first parallel portion and the second parallel portion is configured from two layers of the coil conductor; <1> ~ <10> 10. The laminated coil component according to claim 9, wherein the first and second laminated coil components are arranged in a direction perpendicular to the plane of the sheet.

[0407] <12> The maximum number of the via conductors that are continuously overlapped in the stacking direction is 2. <1> ~ <11> 10. The laminated coil component according to claim 9, wherein the first and second laminated coil components are arranged in a direction perpendicular to the plane of the sheet.

[0408] <13> a part of the coil conductor constituting the first parallel portion that is not on the first insulating layer and a part of the coil conductor constituting the second parallel portion that is not on the first insulating layer are respectively disposed on different insulating layers. <1> ~ <12> 10. The laminated coil component according to claim 9, wherein the first and second laminated coil components are arranged in a direction perpendicular to the plane of the sheet.

[0409] <14> the parallel section further includes a third parallel section electrically connected in series to the second parallel section; a portion of the coil conductor constituting the second parallel portion and a portion of the coil conductor constituting the third parallel portion are arranged so as to be directly connected to each other on the same surface of the second insulating layer, which is the same insulating layer; a portion of the coil conductor constituting the second parallel portion that is not on the second insulating layer and a portion of the coil conductor constituting the third parallel portion that is not on the second insulating layer are respectively disposed on different insulating layers. <13> The laminated coil component according to claim 1.

[0410] <15> the first parallel portion and the second parallel portion do not overlap when viewed from the stacking direction; <1> ~ <14> 10. The laminated coil component according to claim 9, wherein the first and second laminated coil components are arranged in a direction perpendicular to the plane of the sheet.

[0411] <16> the parallel section further includes a third parallel section electrically connected in series to the second parallel section; a portion of the coil conductor constituting the second parallel portion and a portion of the coil conductor constituting the third parallel portion are arranged so as to be directly connected to each other on the same surface of the second insulating layer, which is the same insulating layer; the second parallel portion and the third parallel portion do not overlap when viewed from the stacking direction; <15> The laminated coil component according to claim 1. [Example]

[0412] EXAMPLES Hereinafter, examples will be given that more specifically disclose the laminated coil component of the present invention, but the present invention is not limited to these examples.

[0413] As a sample of the example, a laminated coil component having the structure shown in FIG. 7 was fabricated.

[0414] As a sample for comparison, a laminated coil component having the structure shown in FIG. 6 was fabricated.

[0415] One hundred samples each of the example and comparative example were set upright so that the surfaces along the width direction W and the height direction T (WT surfaces) were exposed, and the periphery of the samples was hardened with resin. Thereafter, the samples were polished to approximately the center in the length direction L using a polishing machine. The cross sections obtained by polishing were observed with a digital microscope to check for the presence or absence of cracks.

[0416] The number of cracks found growing toward the body surface (side gap direction) was 100 / 100 in the comparative example samples, while it was 0 / 100 in the example samples. [Explanation of symbols]

[0417] 1A multilayer coil components 10A, 10B, 10C, 10D, 10E laminate 11 first end face 12 Second end face 13 First principal surface 14 Second main surface 15 First Aspect 16 The Second Aspect 21, 22 External electrode 30A, 30B, 30C, 30D, 30E coils 41, 42 Lead conductor CC, CC1, CC2, CC3, CC4, CC5, CC6, CC7, CC8, CC9, CC10, CC11, CC12 Coil conductor IL1, IL2, IL3, IL4, IL5, IL6, IL7, IL8, IL9, IL10, IL11, IL12 insulating layer V, V2x, V2y, V3x, V3y, V4x, V4y, V5x, V5y, V6x, V6y, V7x, V7y, V8x, V8y, V9x, V9y, V10x, V10y, V11x, V11y, V12x, V12y Via conductor P1 First parallel section P2 Second parallel section P1a, P1b, P1c, P1d, P1e, P1f, P2a, P2b, P2c, P2d, P2e Parallel section L lengthwise T Height direction W width direction

Claims

1. a laminate in which a plurality of insulating layers are stacked in a stacking direction and a coil is built in; an external electrode provided on an outer surface of the laminate and electrically connected to the coil; the coil is configured by electrically connecting a plurality of coil conductors stacked together with the insulating layers in the stacking direction, the coil includes a parallel portion configured of two or more layers of the coil conductors electrically connected in parallel through via conductors; the parallel section includes a first parallel section and a second parallel section electrically connected in series to the first parallel section, a portion of the coil conductor constituting the first parallel portion and a portion of the coil conductor constituting the second parallel portion are arranged so as to be directly connected to each other on the same surface of the first insulating layer, which is the same insulating layer; a portion of the coil conductor constituting the first parallel portion that is not on the first insulating layer and a portion of the coil conductor constituting the second parallel portion that is not on the first insulating layer are disposed on different insulating layers, when the coil conductors adjacent to each other with the first insulating layer sandwiched therebetween are viewed in the stacking direction, at least a portion of the coil conductors adjacent to each other with the first insulating layer sandwiched therebetween overlap with each other, even in a portion other than a parallel portion connected in parallel with the first insulating layer sandwiched therebetween.

2. 2. The laminated coil component according to claim 1, wherein a ratio of the path of the first parallel portion to the path of one turn of the coil is different from a ratio of the path of the second parallel portion to the path of one turn of the coil.

3. the parallel section further includes a third parallel section electrically connected in series to the second parallel section; 2. The laminated coil component according to claim 1, wherein a portion of the coil conductor constituting the second parallel portion and a portion of the coil conductor constituting the third parallel portion are arranged so as to be directly connected to each other on the same surface of the second insulating layer, which is the same insulating layer.

4. the parallel section further includes a fourth parallel section electrically connected in series to the third parallel section, 4. The laminated coil component according to claim 3, wherein a portion of the coil conductor constituting the third parallel portion and a portion of the coil conductor constituting the fourth parallel portion are arranged so as to be directly connected to each other on the same surface of the third insulating layer, which is the same insulating layer.

5. a ratio of the path of the first parallel section to the path of one turn of the coil is different from a ratio of the path of the second parallel section to the path of one turn of the coil, 5. The laminated coil component according to claim 4, wherein a ratio of the path of the third parallel portion to the path of one turn of the coil is different from a ratio of the path of the fourth parallel portion to the path of one turn of the coil.

6. a ratio of the path of the first parallel section to the path of one turn of the coil is the same as a ratio of the path of the third parallel section to the path of one turn of the coil, 6. The laminated coil component according to claim 5, wherein a ratio of the path of the second parallel portion to the path of one turn of the coil is the same as a ratio of the path of the fourth parallel portion to the path of one turn of the coil.

7. a ratio of the path of the first parallel section to the path of one turn of the coil is the same as a ratio of the path of the third parallel section to the path of one turn of the coil, 6. The laminated coil component according to claim 5, wherein a ratio of the path of the second parallel portion to the path of one turn of the coil is different from a ratio of the path of the fourth parallel portion to the path of one turn of the coil.

8. a ratio of the path of the first parallel section to the path of one turn of the coil is different from a ratio of the path of the third parallel section to the path of one turn of the coil, 6. The laminated coil component according to claim 5, wherein a ratio of the path of the second parallel portion to the path of one turn of the coil is different from a ratio of the path of the fourth parallel portion to the path of one turn of the coil.

9. 9. The laminated coil component according to claim 2, wherein a ratio of the length of the path of the first parallel portion to a length of the path of one turn of the coil is 0.4 or more and 0.8 or less, and a ratio of the length of the path of the second parallel portion to a length of the path of one turn of the coil is 0.1 or more and less than 0.

4.

10. 9. The laminated coil component according to claim 1, wherein at least one of the via conductors is connected to a side of the coil conductor other than the bent portion.

11. 9. The laminated coil component according to claim 1, wherein each of the parallel portions including the first parallel portion and the second parallel portion is configured from two layers of the coil conductor.

12. The laminated coil component according to claim 11, wherein the maximum number of the via conductors that overlap consecutively in the stacking direction is two.

13. each of the parallel portions including the first parallel portion and the second parallel portion is formed of two layers of the coil conductor; the maximum number of the via conductors that are continuously overlapped in the stacking direction is two; 9. The laminated coil component according to claim 3, wherein a portion of the coil conductor constituting the second parallel portion that is not on the second insulating layer and a portion of the coil conductor constituting the third parallel portion that is not on the second insulating layer are respectively disposed on different insulating layers.

14. The laminated coil component according to claim 12 , wherein the first parallel portion and the second parallel portion do not overlap when viewed in the stacking direction.

15. each of the parallel portions including the first parallel portion and the second parallel portion is formed of two layers of the coil conductor; the maximum number of the via conductors that are continuously overlapped in the stacking direction is two; the first parallel portion and the second parallel portion do not overlap when viewed from the stacking direction, 9. The laminated coil component according to claim 3, wherein the second parallel portion and the third parallel portion do not overlap when viewed in the stacking direction.

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