Lamination coil component

Abstract

To provide a lamination coil component relaxing a residual stress generated between a coil conductor and an insulation layer around it while keeping a strength of a lamination body.SOLUTION: A lamination coil component 1 comprises: a lamination body 10 that is formed by laminating a plurality of insulation layers 31, and includes a coil 30 therein; and a first external electrode 21 and a second external electrode 22 that are electrically connected to the coil. The coil is formed by electrically connecting a plurality of coil conductors 32 laminated with the insulation layer. Each coil conductor is composed of three or more layers. In view of a cross section in a direction vertical to a direction where the coil conductor is extended, a cross sectional shape of the coil conductor is a flat shape. The coil conductor 32 closest to a center of the lamination body in a lamination direction is a first coil conductor 60. A gap 51 is provided between one surface of at least one coil conductor of coil conductors other than the first coil conductor and the insulation layer 31, but the gap is not provided between an external peripheral end part 62 of the first coil conductor 60 and the insulation layer 31.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] Patent Document 1 describes a multilayer inductor formed by firing a laminate formed by laminating a magnetic paste obtained by mixing a binder with magnetic powder and a conductive paste, and having a void portion between a conductor layer forming an internal coil and a magnetic layer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the multilayer inductor described in Patent Document 1, as shown in FIG. 3, a technique of providing a void portion around the entire circumference of the winding coil is disclosed.

[0005] By providing such a void to cut the bonding at the interface between the coil conductor and the surrounding insulating layer, the difference in shrinkage rate during firing between the coil conductor material and the insulating layer material (generally, the shrinkage rate of the coil conductor material is larger than that of the insulating layer material) can be reduced. Therefore, it is possible to suppress a decrease in the magnetic permeability of the laminate and a decrease in the Z characteristic (electrical characteristic) of the inductor due to this residual stress, and to improve the Z characteristic of the inductor.

[0006] However, when voids are formed over the entire circumference of the coil conductor as in the case of the laminated inductor described in Patent Document 1, the proportion of voids in the laminate (element) becomes too large. As a result, the strength of the laminate itself decreases. In particular, external stress tends to concentrate in the voids provided at the outer peripheral side end portion of the coil conductor, and there is a risk of cracks occurring in the vicinity thereof. Further, bending stress and external forces such as a mounter nozzle largely concentrate near the central portion of the laminate, and there is a risk of cracks occurring in that portion.

[0007] The present invention has been made to solve the above problems, and an object thereof is to provide a laminated coil component capable of relaxing residual stress generated between a coil conductor and an insulating layer around the coil while maintaining the strength of the laminate.

Means for Solving the Problems

[0008] In a first aspect, the laminated coil component of the present invention includes a laminate formed by laminating a plurality of insulating layers and having a coil inside, a first external electrode and a second external electrode electrically connected to the coil. The coil is formed by electrically connecting a plurality of coil conductors laminated together with the insulating layers. The coil conductors are three or more layers. When a cross-section in a direction perpendicular to the direction in which the coil conductor extends is viewed, the cross-sectional shape of the coil conductor is a flat shape. The coil conductor closest to the center of the laminate in the stacking direction is defined as the first coil conductor. Among the coil conductors other than the first coil conductor, a void is provided between at least one side surface of the coil conductor and the insulating layer, and no void is provided between the outer peripheral side end portion of the first coil conductor and the insulating layer.

[0009] In a second aspect, the laminated coil component of the present invention includes a laminate formed by laminating a plurality of insulating layers and having a coil inside, a first external electrode and a second external electrode electrically connected to the coil. The coil is formed by electrically connecting a plurality of coil conductors laminated together with the insulating layers. A void is provided between at least one of the coil conductors and the insulating layer, being biased toward the inner peripheral side of the coil conductor.

Advantages of the Invention

[0010] According to the present invention, it is possible to provide a laminated coil component capable of relaxing the residual stress generated between the coil conductor and the surrounding insulating layer while maintaining the strength of the laminate.

Brief Description of the Drawings

[0011]

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Mode for Carrying Out the Invention

[0012] Hereinafter, the laminated coil component of the present invention will be described. Note that the present invention is not limited to the following configuration and may be appropriately changed without departing from the gist of the present invention. Also, a combination of a plurality of the individual preferred configurations described below is also the present invention.

[0013] The drawings shown below are schematic diagrams, and their dimensions, scales of aspect ratios, etc. may differ from those of actual products. In the drawings, the same or corresponding parts shall be denoted by the same reference numerals. Also, in each figure, the same elements shall be denoted by the same reference numerals and overlapping descriptions shall be omitted.

[0014] In this specification, terms indicating the relationship between elements (e.g., "parallel", "orthogonal", etc.) and terms indicating the shape of elements do not only mean the strictly literal aspect, but also mean a substantially equivalent range, for example, a range including a difference of about several percent.

[0015] Each of the embodiments shown below is illustrative, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. In the second and subsequent embodiments, descriptions of matters common to the first embodiment will be omitted, and only the differences will be explained. In particular, for the same functions and effects due to the same configurations, they will not be sequentially mentioned for each embodiment.

[0016] (Embodiment 1) FIG. 1 is a perspective view schematically showing an example of the multilayer coil component of Embodiment 1. The multilayer coil component 1 shown in FIG. 1 includes a laminate (element body) 10, a first external electrode 21 and a second external electrode 22 provided on the outer surface of the laminate 10. The laminate 10 has a rectangular parallelepiped shape having six faces. Although the configuration of the laminate 10 will be described later, a plurality of insulating layers and a plurality of coil conductors are laminated in the lamination direction, and a coil is provided inside. The first external electrode 21 and the second external electrode 22 are each electrically connected to the coil.

[0017] In the multilayer coil component and the laminate in this specification, the length direction, the height direction, and the width direction are the L direction, the T direction, and the W direction in FIG. 1. Here, the length direction L, the height direction T, and the width direction W are orthogonal to each other. Here, the length direction L is a direction parallel to the lamination direction.

[0018] As shown in FIG. 1, the laminate 10 has a first end face 11 and a second end face 12 that face each other in the length direction L, a first main face 13 and a second main face 14 that face each other in the height direction T orthogonal to the length direction L, and a first side face 15 and a second side face 16 that face each other in the width direction W orthogonal to the length direction L and the height direction T.

[0019] Although not shown in FIG. 1, it is preferable that the corners and ridge lines of the laminate 10 are rounded. A corner is a portion where three faces of the laminate intersect, and a ridge line is a portion where two faces of the laminate intersect.

[0020] For example, as shown in FIG. 1, the first external electrode 21 covers the entire first end face 11 of the laminate 10 and extends from the first end face 11 to cover a part of the first main face 13, a part of the second main face 14, a part of the first side face 15, and a part of the second side face 16.

[0021] For example, as shown in FIG. 1, the second external electrode 22 covers the entire second end face 12 of the laminate 10 and extends from the second end face 12 to cover a part of the first main face 13, a part of the second main face 14, a part of the first side face 15, and a part of the second side face 16.

[0022] When mounting the laminated coil component 1 in which the first external electrode 21 and the second external electrode 22 are arranged as described above on a substrate, any one of the first main face 13, the second main face 14, the first side face 15, and the second side face 16 of the laminate 10 becomes the mounting face.

[0023] However, the first external electrode 21 only needs to extend from at least a part of the first end face 11 of the laminate 10 to the mounting face of the laminate 10.

[0024] Similarly, the second external electrode 22 only needs to extend from at least a part of the second end face 12 of the laminate 10 to the mounting face of the laminate 10.

[0025] The first external electrode 21 and the second external electrode 22 may each have a single-layer structure or a multi-layer structure.

[0026] When the first external electrode 21 and the second external electrode 22 each have a single-layer structure, examples of the constituent material of each external electrode include Ag, Au, Cu, Pd, Ni, Al, and alloys containing at least one of these metals.

[0027] When the first external electrode 21 and the second external electrode 22 each have a multilayer structure, each external electrode may have, for example, a base electrode layer containing Ag, a Ni film, and a Sn film in this order from the surface side of the laminate 10.

[0028] The size of the laminated coil component of the present invention is not particularly limited, but is preferably 1608 size, 0603 size, 0402 size, or 1005 size.

[0029] FIG. 2 is an exploded perspective view schematically showing an example of the laminate constituting the laminated coil component shown in FIG. 1.

[0030] As shown in FIG. 2, the laminate 10 is configured by laminating a plurality of insulating layers 31a, 31b, 31c, 31d, 31e, and 31f in the lamination direction (here, the length direction L) from the first end face 11 side to the second end face 12 side of the laminate 10. Hereinafter, the insulating layers 31a, 31b, 31c, 31d, 31e, and 31f will also be collectively referred to as the insulating layer 31.

[0031] In this specification, the direction in which a plurality of insulating layers constituting the laminate are stacked is referred to as the lamination direction.

[0032] In FIG. 2, the insulating layer 31e is disposed on the lower side in the lamination direction (the first end face 11 side of the laminate 10), and the insulating layer 31f is disposed on the upper side in the lamination direction (the second end face 12 side of the laminate 10).

[0033] Examples of the constituent material of each insulating layer 31 include magnetic materials such as ferrite materials.

[0034] The insulating layers 31a, 31b, 31c, and 31d are respectively provided with coil conductors 32a, 32b, 32c, and 32d and via conductors 33a, 33b, 33c, and 33d. The insulating layer 31e is provided with a via conductor 33e and a land 35e. The insulating layer 31f is provided with a via conductor 33f and a land 35f. The insulating layer 31e may be a single layer or two or more layers. Similarly, the insulating layer 31f may be a single layer or two or more layers. Hereinafter, the coil conductors 32a, 32b, 32c, and 32d are also collectively referred to as the coil conductor 32.

[0035] The coil conductors 32a, 32b, 32c, and 32d are respectively provided on the main surfaces of the insulating layers 31a, 31b, 31c, and 31d, and are laminated together with the insulating layers 31a, 31b, 31c, 31d, 31e, and 31f. In FIG. 2, each coil conductor 32 has a 3 / 4 turn shape, and four insulating layers 31 arranged in the order of the insulating layers 31a, 31b, 31c, and 31d are taken as one unit (for 3 turns) and repeatedly laminated.

[0036] Also, the coil conductors 32a, 32b, 32c, and 32d respectively include annular circumferential portions 34a, 34b, 34c, and 34d with one part missing and partially having a gap, and lands 35a, 35b, 35c, and 35d. Lands 35a, 35b, 35c, and 35d are respectively provided at both ends of each circumferential portion 34a, 34b, 34c, and 34d. Hereinafter, the circumferential portions 34a, 34b, 34c, and 34d are also collectively referred to as the circumferential portion 34.

[0037] The via conductors 33a, 33b, 33c, 33d, 33e, and 33f are respectively provided so as to penetrate the insulating layers 31a, 31b, 31c, 31d, 31e, and 31f in the lamination direction. Hereinafter, the via conductors 33a, 33b, 33c, 33d, 33e, and 33f are also collectively referred to as the via conductor 33.

[0038] Lands 35e and 35f are provided directly above via conductors 33e and 33f, respectively. Lands 35a, 35b, 35c, 35d, 35e, and 35f are preferably slightly larger than the line widths of the circumferential portions 34a, 34b, 34c, and 34d. Hereinafter, lands 35a, 35b, 35c, 35d, 35e, and 35f are also collectively referred to as land 35. Land 35 is larger than the adjacent via conductors 33, and when viewed from the stacking direction (length direction L), the via conductors 33 adjacent to land 35 are contained within the region of that land 35.

[0039] Examples of the constituent materials of each coil conductor 32 including the circumferential portion 34 and land 35 and each via conductor 33 include Ag, Au, Cu, Pd, Ni, Al, alloys containing at least one of these metals, and the like.

[0040] The plurality of insulating layers 31a, 31b, 31c, 31d, 31e, and 31f configured as described above are stacked in the stacking direction. Thereby, the laminate 10 is formed, and the plurality of coil conductors 32a, 32b, 32c, and 32d are electrically connected via the via conductors 33a, 33b, 33c, and 33d. As a result, a solenoid-shaped coil having a coil axis parallel to the stacking direction is formed within the laminate 10.

[0041] Also, via conductor 33e and land 35e serve as a first lead conductor within the laminate 10 and are exposed on the first end face 11 of the laminate 10. That is, the first lead conductor includes via conductor 33e and land 35e. As will be described later, the first lead conductor connects between the first external electrode 21 and the coil conductor 32a facing it within the laminate 10.

[0042] Via conductor 33f and land 35f serve as a second lead conductor within the laminate 10 and are exposed on the second end face 12 of the laminate 10. That is, the second lead conductor includes via conductor 33f and land 35f. As will be described later, the second lead conductor connects between the second external electrode 22 and the coil conductor 32d facing it within the laminate 10.

[0043] When viewed from the stacking direction (length direction L), the coil conductors 32 preferably overlap each other. Further, when viewed from the stacking direction, the coil may have a shape composed of straight portions as shown in FIG. 2 (for example, a polygonal shape such as a rectangle), a shape composed of curved portions (for example, a circular shape), or a shape composed of straight portions and curved portions.

[0044] FIG. 3 is a side view schematically showing an example of the internal structure of the laminate constituting the stacked coil component shown in FIG. 1 in a perspective view.

[0045] As shown in FIG. 3, in the stacked coil component 1, since a plurality of insulating layers 31 are stacked in the length direction L, the length direction L is the stacking direction. Further, the stacking direction of the laminate 10 and the coil axis A of the coil 30 are parallel to any one of the first main surface 13, the second main surface 14, the first side surface 15, or the second side surface 16 which is the mounting surface, for example, the first main surface 13. That is, the stacked coil component 1 is a horizontally wound stacked inductor in which the coil 30 is provided so that the coil axis A is parallel to the mounting surface.

[0046] Note that, as shown in FIG. 3, actually, no boundary is visually recognized between adjacent insulating layers 31.

[0047] The first lead conductor 41 extends in the stacking direction within the laminate 10 and linearly connects between the first external electrode 21 provided on the first end face 11 and the coil conductor 32a facing the first external electrode 21. Similarly, the second lead conductor 42 extends in the stacking direction within the laminate 10 and linearly connects between the second external electrode 22 provided on the second end face 12 and the coil conductor 32d facing the second external electrode 22.

[0048] Note that when viewed from the stacking direction (length direction L), it is preferable that the via conductors constituting the lead conductor overlap each other, but the via conductors constituting the lead conductor do not have to be strictly linearly arranged.

[0049] Also, in FIGS. 2 and 3, the case where the number of stacked layers of the coil conductor 32 for forming three turns of the coil 30 is 4, that is, the case where the repeating shape is a 3 / 4 turn shape, is illustrated. However, the number of stacked layers of the coil conductor 32 for forming one turn of the coil 30 is not particularly limited. For example, the number of stacked layers of the coil conductor 32 for forming one turn of the coil 30 may be 2, that is, the repeating shape may be a 1 / 2 turn shape.

[0050] Also, the number of stacked layers of the coil conductor 32, that is, the total number of stacked coil conductors 32 included in the laminate 10 is not particularly limited as long as it is three or more layers, but is preferably 10 or more and 60 or less. As shown in FIGS. 2 to 4, the number of stacked layers of the coil conductor 32 may be three or more and an odd number of layers.

[0051] FIG. 4 is a cross-sectional view schematically showing an example of a cross-section along the line segment A1 - A1 of the laminated coil component shown in FIG. 1. Note that FIG. 4 shows a cross-section of the circumferential portion 34 of the coil conductor 32.

[0052] As shown in FIG. 4, when looking at a cross-section in a direction perpendicular to the direction in which the coil conductor 32 extends, the cross-sectional shape of the coil conductor 32 is a flat shape (longitudinal shape), and its longitudinal direction is orthogonal to the stacking direction (length direction L). In the example shown in FIG. 4, the cross-sectional shape of the coil conductor 32 is an ellipse whose major axis is orthogonal to the stacking direction, but the cross-sectional shape of the coil conductor 32 is not particularly limited, and for example, it may be a rectangular shape in which the lengths of a pair of opposite sides in the stacking direction are the same, or a trapezoidal shape in which the lengths of a pair of opposite sides in the stacking direction are different.

[0053] Also, as shown in FIG. 4, each of the coil conductors 32 has a first surface 36 facing a first direction parallel to the coil axis A and a second surface 37 facing the side opposite to the first direction. Both the first surface 36 and the second surface 37 extend in a direction orthogonal to the stacking direction.

[0054] Here, the coil conductor 32 closest to the center of the laminate 10 in the stacking direction (length direction L) (see the center line B in FIGS. 3 and 4) is defined as the first coil conductor 60 (see FIG. 4).

[0055] Among the coil conductors 32 other than the first coil conductor 60, a gap 51 is provided between at least one side surface of the coil conductor 32 and the insulating layer 31, and no gap is provided between the outer peripheral side end portion 62 of the first coil conductor 60 and the insulating layer 31. In this way, for the coil conductor 32 existing in the central portion of the laminate 10, no gap is provided adjacent to at least the outer peripheral side end portion 62, and for the other coil conductors 32, a gap is provided adjacent to one side surface, so that while maintaining the strength of the laminate 10, the residual stress generated between the coil conductor 32 and the surrounding insulating layer can be relaxed. Hereinafter, when a gap 51 is provided between one side surface of the coil conductor 32 and the insulating layer 31, it may be simply stated that "a gap is provided on one side surface of the coil conductor 32".

[0056] In addition, in this specification, the "gap" refers to a space where the coil and the insulating layer do not contact (that is, the space between the coil and the insulating layer) and whose thickness is 1.5 μm or more. Therefore, when the thickness of the space where the coil and the insulating layer do not contact is less than 1.5 μm, that space is not treated as a gap. For example, bubbles with a thickness of less than 1.5 μm are not treated as gaps even if they exist between the coil and the insulating layer.

[0057] When voids are formed around the entire circumference of all coil conductors as in the laminated inductor described in Patent Document 1, or when voids are formed only on one side of all coil conductors, voids also exist near the center of the laminate where external stress is likely to concentrate during mounting of the laminated coil component, and external stress is likely to concentrate on the void portions. Further, for example, when bending stress is applied as external stress, the bending stress is likely to be applied to the center of the laminate in the lamination direction, and particularly to the outer peripheral side end portion of the coil conductor at the center of the laminate in the lamination direction. This bending stress is particularly likely to be applied during manufacturing or transportation of the laminated coil component, and cracks have occurred starting from the voids existing at the outer peripheral side end portion of the coil conductor at the center of the laminate in the lamination direction due to the bending stress. On the other hand, in the present embodiment, since no void is provided at the outer peripheral side end portion 62 of the first coil conductor 60 closest to the center of the laminate 10 in the lamination direction, such external stress can be alleviated, and as a result, the strength of the laminate 10 can be maintained.

[0058] Also, although it is a problem peculiar to the horizontally wound laminated inductor, the strength against the stress applied to the laminate by the mounter nozzle during mounting can also be increased. Specifically, since the mounter nozzle applies pressure to the center of the outer surface of the laminate facing the mounting surface of the laminate in the lamination direction, stress is applied to the laminate starting from there. According to the laminated coil component 1 which is a horizontally wound laminated inductor, the strength against cracks caused by this stress can also be increased.

[0059] On the other hand, in portions other than the center of the laminate in the lamination direction, since such external stress is unlikely to concentrate, for the coil conductors 32 other than the first coil conductor 60, that is, the coil conductors 32 far from the center of the laminate 10 in the lamination direction, voids 51 are provided, so that the residual stress caused by the difference in shrinkage rate during firing between the coil conductor material and the insulating layer material can be alleviated. However, by providing the voids 51 only on one side of the coil conductor 32, it is possible to prevent the proportion of the voids 51 in the laminate 10 from becoming too large and the strength of the laminate 10 itself from decreasing.

[0060] As described above, it is possible to achieve both ensuring the strength of the laminate 10 and relaxing the residual stress.

[0061] In this specification, the inner peripheral side and the outer peripheral side of the coil conductor respectively mean the coil axis side of the coil and the opposite side (the outside of the coil).

[0062] Note that the one side of the coil conductor 32 where the gap 51 is provided may be either the first surface 36 or the second surface 37 of the coil conductor 32. Also, as shown in FIG. 4, when the gap 51 is provided on one side of a plurality of coil conductors 32, the surfaces where the gap 51 is provided may each be either the first surface 36 or the second surface 37, and the coil conductor 32 with the gap 51 provided on the first surface 36 and the coil conductor 32 with the gap 51 provided on the second surface 37 may be mixed, but it is easier in manufacturing to align them on either the first surface 36 or the second surface 37.

[0063] Also, no gap is provided between the surface opposite to the one side of the coil conductor 32 where the gap 51 is provided and the insulating layer 31.

[0064] Also, when there are two coil conductors 32 at equal intervals with respect to the center (center line B) of the laminate 10 in the lamination direction, that is, when the center line B exists at the center between two adjacent coil conductors 32, both of these two coil conductors 32 are the first coil conductors 60. Therefore, in this case, a gap 51 is provided between at least one side of the coil conductors 32 other than these two first coil conductors 60 and the insulating layer 31, and no gap is provided between the outer peripheral side ends 62 of these two first coil conductors 60 and the insulating layer 31.

[0065] As shown in FIG. 4, a gap 51 may be provided between one side of all the coil conductors 32 other than the first coil conductor 60 and the insulating layer 31. In this case, the residual stress can be more effectively relaxed.

[0066] Further, as shown in FIG. 4, a gap may not be provided between the first coil conductor 60 and the insulating layer 31. That is, there may be no gap around the entire circumference of the first coil conductor 60. In this case, the strength of the laminate 10 can be further improved.

[0067] FIG. 5 is a cross-sectional view schematically showing another example (Modification 1) of a cross-section along line segment A1-A1 of the laminated coil component shown in FIG. 1.

[0068] As shown in FIG. 5, a gap may not be provided between each of the two coil conductors 32 located immediately adjacent to the first coil conductor 60 in the stacking direction of the laminate 10 and the insulating layer 31. That is, a gap may not be provided for the three coil conductors 32 located at the central portion in the stacking direction of the laminate 10. In this case, the strength of the laminate 10 can be further improved.

[0069] FIG. 6 is a cross-sectional view schematically showing still another example (Modification 2) of a cross-section along line segment A1-A1 of the laminated coil component shown in FIG. 1.

[0070] As shown in FIG. 6, a gap 51 may be provided between the inner peripheral side end portion 61 of the first coil conductor 60 and the insulating layer 31. Since external stress tends to concentrate particularly on the outer peripheral side end portion of the coil conductor, even in this case, it is possible to achieve both ensuring the strength of the laminate 10 and relaxing the residual stress. Further, since a gap 51 is also provided in the first coil conductor 60, the residual stress can be more effectively relaxed. Note that a gap may or may not be provided between the central portion of the first coil conductor 60 and the insulating layer 31.

[0071] FIG. 7 is an exploded perspective view schematically showing another example (Modification 3) of the laminate constituting the laminated coil component shown in FIG. 1. FIG. 8 is a side view schematically showing an example of the internal structure of another example (Modification 3) of the laminate constituting the laminated coil component shown in FIG. 1 in a perspective manner. FIG. 9 is a cross-sectional view schematically showing another example (Modification 3) of a cross-section along line segment A1-A1 of the laminated coil component shown in FIG. 1.

[0072] As shown in FIGS. 7 to 9, the number of layers of the coil conductors 32 may be 4 or more and an even number. Here, if the coil conductor 32 close to the center of the laminate 10 in the stacking direction (see the center line B in FIGS. 8 and 9) is the second coil conductor 70 (see FIG. 9) after the first coil conductor 60, among the coil conductors 32 other than the first coil conductor 60 and the second coil conductor 70, a gap 51 is provided between at least one side of the coil conductor 32 and the insulating layer 31, and no gap may be provided between the outer peripheral side end 62 of the first coil conductor 60 and the insulating layer 31, and between the outer peripheral side end 72 of the second coil conductor 70 and the insulating layer 31. Even in this case, while maintaining the strength of the laminate 10, the residual stress generated between the coil conductor 32 and the surrounding insulating layer can be relaxed.

[0073] As shown in FIG. 9, a gap 51 may be provided between one side of all the coil conductors 32 other than the first coil conductor 60 and the second coil conductor 70 and the insulating layer 31. In this case, the residual stress can be more relaxed.

[0074] Also, as shown in FIG. 9, no gap may be provided between the first coil conductor 60 and the insulating layer 31, and between the second coil conductor 70 and the insulating layer 31. That is, there may be no gap around the entire circumference of the first coil conductor 60 and the entire circumference of the second coil conductor 70. In this case, the strength of the laminate 10 can be further improved.

[0075] Although not shown, a gap may be provided between the inner peripheral side end 61 of the first coil conductor 60 and the insulating layer 31, and / or between the inner peripheral side end 71 of the second coil conductor 70 and the insulating layer 31 (see FIG. 6). Also, a gap may or may not be provided between the central portion of the first coil conductor 60 and the insulating layer 31. Similarly, a gap may or may not be provided between the central portion of the second coil conductor 70 and the insulating layer 31.

[0076] Further, gaps may not be provided between each of the two coil conductors 32 respectively existing on both sides of the first coil conductor 60 and the second coil conductor 70 in the stacking direction of the laminate 10 and the insulating layer 31. That is, gaps may not be provided for the four layers of coil conductors 32 located at the central portion in the stacking direction of the laminate 10. In this case, the strength of the laminate 10 can be further improved.

[0077] Here, the generation of cracks starting from the gaps inside the element body of the multilayer coil component 1 mounted on the substrate will be described.

[0078] FIG. 10 is a diagram schematically showing a perspective view of an example of the internal structure of the laminate constituting the multilayer coil component shown in FIG. 1, and is a view seen from the second end face side of the laminate.

[0079] As shown in FIG. 10, the distance in the height direction between the coil 30 and the first main surface 13 is defined as the side gap G1, and the distance in the height direction between the coil 30 and the second main surface 14 is defined as the side gap G2. Here, the first main surface 13 is the mounting surface.

[0080] When the substrate on which the multilayer coil component is mounted is bent, stress is particularly applied to the region near the end of the external electrode extending on the mounting surface inside the element body of the multilayer coil component. When the side gap G1 becomes small, the distance between the first main surface 13, which is the mounting surface, and the coil conductor 32 becomes close, and the distance to the gap 51 provided on the coil conductor 32 also becomes close. And if the side gap G1 becomes too small, the gap 51 approaches the above-mentioned region where stress is particularly applied, and cracks may occur inside the element body starting from the gap 51.

[0081] Therefore, from the perspective of suppressing the occurrence of cracks due to the bending of the substrate, it is preferable that the side gap G1 is ensured to a certain extent. Specifically, it is preferably 43 μm or more, more preferably 44 μm or more, and still more preferably 46 μm or more. By setting the lower limit of the side gap G1 in this way, it is possible to prevent cracks from occurring due to the bending of the substrate. Note that the upper limit of the side gap G1 is not particularly limited, but it may be 150 μm or less. Also, the side gap G2 is not particularly limited, but similar to the side gap G1, it may be 43 μm or more and 150 μm or less.

[0082] When the size of the multilayer coil component becomes smaller, the required lower limit of the side gap G1 also becomes smaller. Therefore, in the multilayer coil component 1 that satisfies the above side gap G1, it is possible to more effectively prevent the occurrence of cracks due to the bending of the substrate. From such a perspective, the size of the multilayer coil component 1 is preferably 1608 size or less. For example, it is more preferably 1608 size, 1005 size, 0603 size, or 0402 size.

[0083] Hereinafter, the results of simulating the stress when an external stress is applied to the laminate 10 of the multilayer coil component 1 of Embodiment 1 will be described.

[0084] FIG. 11 is a schematic diagram showing the models of Examples 1 and 2 and Comparative Examples 1 and 2 used in the stress simulation.

[0085] As shown in Fig. 11, coils 132 with five layers were arranged in all models. In the model of Example 1, no gap was provided in the first coil conductor 160 closest to the center of the laminate in the stacking direction, and gaps 150 were provided on one side of all coil conductors 132 other than the first coil conductor 160. In the model of Example 2, no gaps were provided in the first coil conductor 160 closest to the center of the laminate in the stacking direction and the coil conductors 132 on both sides thereof, and gaps 150 were provided only on one side of the outermost two coil conductors 132. In the model of Comparative Example 1, gaps 150 were provided on the entire surface (entire circumference) of all coil conductors 132. In the model of Comparative Example 2, gaps 150 were provided only on one side of all coil conductors 132. In all models, the size of the laminate was assumed to be the 1005 size, the dimensions in the width direction W and the height direction T were both 0.5 mm, and the side gaps G1 and G2 were both 70 μm. The maximum thickness of the coil conductor was 20 μm, the line width of the coil conductor was 120 μm, and the thickness of the gap was made constant at 4 μm. For each model, bending stress was similarly applied to the position (center of the upper surface) indicated by the apex of the triangle in Fig. 11. The results are shown in Fig. 12, Fig. 13 and Table 1 below.

[0086] Fig. 12 is a diagram showing the results of stress analysis of the models of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. Fig. 13 is a graph showing the stress values of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. Similarly, Table 1 below shows the stress values of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. In Fig. 13 and Table 1, the maximum stress value generated in each model is shown as a relative value with respect to the maximum stress generated in the model of Comparative Example 1.

[0087]

Table 1

[0088] As a result, it can be seen that the bending stress is likely to be applied to the outer peripheral side end portion of the coil conductor (see Comparative Example 1 and Comparative Example 2 in Fig. 12). Also, in order to avoid stress from the central portion in the stacking direction of the laminate, it was found to be effective not to provide a gap in the coil conductor existing in the central portion in the stacking direction of the laminate, and as a result, the stress can be significantly relaxed.

[0089] FIG. 14 is a schematic diagram showing the models of Example 3, Example 4, Comparative Example 3, and Comparative Example 4 used for stress simulation.

[0090] As shown in FIG. 14, here, in all models, six layers of coil conductors 132 were arranged, and two layers of coil conductors were arranged at equal intervals with respect to the center of the laminate in the stacking direction. In the model of Example 3, no gap was provided in the two first coil conductors 160 closest to the center of the laminate in the stacking direction, and a gap 150 was provided on one side of all coil conductors 132 other than the two first coil conductors 160. In the model of Example 4, no gap was provided in the two first coil conductors 160 closest to the center of the laminate in the stacking direction and the two coil conductors 132 adjacent to both of them, and a gap 150 was provided only on one side of the two outermost coil conductors 132. In the model of Comparative Example 3, gaps 150 were provided on the entire surface (entire circumference) of all coil conductors 132. In the model of Comparative Example 4, gaps 150 were provided only on one side of all coil conductors 132. Other conditions were the same as those of the model shown in FIG. 11. For each model, a bending stress was similarly applied to the position (center of the upper surface) indicated by the vertex of the triangle in FIG. 14. The results are shown in FIGS. 15, 16, and Table 2 below.

[0091] FIG. 15 is a diagram showing the results of stress analysis of the models of Example 3, Example 4, Comparative Example 3, and Comparative Example 4. FIG. 16 is a graph showing the stress values of Example 3, Example 4, Comparative Example 3, and Comparative Example 4. Similarly, Table 2 below shows the stress values of Example 3, Example 4, Comparative Example 3, and Comparative Example 4. In FIGS. 16 and Table 2, the maximum stress value generated in each model is shown as a relative value with respect to the maximum stress generated in the model of Comparative Example 3.

[0092]

Table 2

[0093] As a result, the same results as those of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 were obtained. That is, it was found that by not providing a gap in the coil conductor existing in the central portion in the stacking direction of the laminate, the stress can be significantly relaxed.

[0094] Hereinafter, regarding the multilayer coil component according to the present embodiment, the results of verifying the side gap amount that does not cause cracks inside the element body will be described.

[0095] As samples, 15 multilayer coil components were produced in which the amounts of side gaps G1 and G2 were different, with gaps provided only between the first surface and the insulating layer in the circumferential portions of all coil conductors. The manufacturing method of the multilayer coil component according to the present embodiment will be described later. This sample is different from the multilayer coil component according to the present embodiment in that gaps are provided on one side of the circumferential portion of the first coil conductor as well. However, in this verification, only the configuration near the external electrodes of the element body is relevant, and even if gaps are provided in the first coil conductor at the center of the element body, it does not affect the test results. All the multilayer coil components were of the 1608 size. When the dimensions of 15 samples were measured and the average values were obtained, the dimensions in the length direction L, width direction W, and height direction T of the multilayer coil component including the external electrodes were 1.530 mm, 0.822 mm, and 0.822 mm, respectively, and the dimensions in the length direction L, width direction W, and height direction T of the laminate excluding the external electrodes were 1.372 mm, 0.783 mm, and 0.783 mm, respectively.

[0096] FIG. 17 is a schematic diagram showing a test method in the verification of the side gap amount.

[0097] As shown in FIG. 17, first, the multilayer coil component 81 as a sample was mounted on the substrate 82 with the first main surface as the mounting surface, and the substrate 82 was supported at the support portions 83a and 83b located 45 mm in the length direction from the center of the multilayer coil component 81 so that the multilayer coil component 81 was on the lower side. Then, stress was applied to the central portion of the multilayer coil component 81 from the back surface of the substrate 82 on which the multilayer coil component 81 was not mounted until the deflection amount of the substrate 82 reached 3 mm, and it was confirmed whether cracks occurred inside the element body of the multilayer coil component 81. Note that a deflection amount of 2 mm is sufficient for practical use, but here the test was conducted with a margin of 3 mm. The results are shown in Table 3 below.

[0098]

Table 3

[0099] From this result, it can be seen that the side gap G1 is preferably 43 μm or more, more preferably 44 μm or more, and even more preferably 46 μm or more.

[0100] (Embodiment 2) FIG. 18 is a cross-sectional view schematically showing an example of the laminated coil component of Embodiment 2. FIG. 18 is a drawing corresponding to the cross-sectional view of FIG. 4, and shows a cross-section corresponding to the cross-section along the line segment A1-A1 of the laminated coil component shown in FIG. 1.

[0101] In the laminated coil component 1A of Embodiment 2, as shown in FIG. 18, a gap 52 is provided biased toward the inner peripheral side of the coil conductor 32 between at least one coil conductor 32 and the insulating layer 31. In this way, by concentrating the gap 52 on the inner peripheral side of the coil conductor 32 without providing a gap on the outer peripheral side of the coil conductor 32 where external stress is likely to concentrate, the external stress can be relaxed and the strength of the laminate 10 can be maintained. Also, compared with the case where gaps are formed around the entire circumference of all the coil conductors as in the laminated inductor described in Patent Document 1, the strength of the laminate 10 can be improved.

[0102] On the other hand, since external stress is less likely to concentrate on the inner peripheral side of the coil conductor 32, by providing the gap 52 biased toward the inner peripheral side of the coil conductor 32, the residual stress caused by the difference in shrinkage rate during firing between the coil conductor material and the insulating layer material can be relaxed.

[0103] From the above, also according to this embodiment, it is possible to achieve both ensuring the strength of the laminate 10 and relaxing the residual stress.

[0104] FIG. 19 is a cross-sectional view schematically showing another example of the laminated coil component of Embodiment 2, showing the coil conductor and its vicinity.

[0105] As shown in FIG. 18, the gap 52 may be provided only at the inner peripheral side end portion 38, or as shown in FIG. 19, it may be provided up to the middle from the inner peripheral side tip 38P to the outer peripheral side tip 39P. As shown in FIGS. 18 and 19, it is preferable that no gap is provided at the outer peripheral side end portion 39 of the coil conductor 32.

[0106] In this specification, the inner peripheral side end portion, the outer peripheral side end portion, and the central portion of the coil conductor mean that when looking at a cross-section in a direction perpendicular to the direction in which the coil conductor 32 extends, as shown in FIG. 19, in the longitudinal direction of the coil conductor 32 (vertical direction in FIG. 19), when the coil conductor 32 is equally divided into three regions, the region R1 located on the innermost peripheral side of the coil conductor 32 is called the inner peripheral side end portion, the region R3 located on the outermost peripheral side of the coil conductor 32 is called the outer peripheral side end portion, and the region R2 located in the center is called the central portion.

[0107] Also, in this specification, when it is said that the gap is biased to the inner peripheral side of the coil conductor, as shown in FIG. 19, when looking at a cross-section in a direction perpendicular to the direction in which the coil conductor 32 extends, it means that the shortest distance from the inner peripheral side tip 38P of the coil conductor 32 to the gap 52 is shorter than the shortest distance from the outer peripheral side tip 39P of the coil conductor 32 to the gap 52. In the case shown in FIG. 19, the inner peripheral side tip 38P of the coil conductor 32 is adjacent to the gap 52, and the shortest distance from the inner peripheral side tip 38P of the coil conductor 32 to the gap 52 is 0.

[0108] In this specification, the inner peripheral side tip and the outer peripheral side tip of the coil conductor mean that when looking at a cross-section in a direction perpendicular to the direction in which the coil conductor 32 extends, as shown in FIG. 19, the location 38P located on the innermost peripheral side and the location 39P located on the outermost peripheral side of the coil conductor 32 are called the inner peripheral side tip and the outer peripheral side tip, respectively.

[0109] As shown in FIG. 18, a gap 52 may be provided biased to the inner peripheral side of each of all the coil conductors 32 between each of the coil conductors 32 and the insulating layer 31.

[0110] Although illustration is omitted, a gap 52 is provided only between some of the coil conductors 32 and the insulating layer 31, biased toward the inner peripheral side of the coil conductor 32, and gaps may not be provided between the remaining coil conductors 32 and the insulating layer 31.

[0111] Hereinafter, the results of simulating the stress when an external stress is applied to the laminate 10 of the laminated coil component 1A of Embodiment 2 will be described.

[0112] FIG. 20 is a schematic diagram showing the models of Example 5 and Comparative Examples 5 and 6 used for the stress simulation.

[0113] As shown in FIG. 20, here, five-layer coil conductors 132 are arranged in all the models. In the model of Example 5, gaps 150 are provided only at the inner peripheral side ends 138 of each coil conductor 132. In the model of Comparative Example 5, gaps 150 are provided on the entire surface (entire circumference) of all the coil conductors 132. In the model of Comparative Example 6, gaps 150 are provided only at the outer peripheral side ends 139 of each coil conductor 132. Other conditions were the same as those of the model shown in FIG. 11. For each model, a bending stress was similarly applied to the position (center of the upper surface) indicated by the apex of the triangle in FIG. 20. The results are shown in FIGS. 21 and 22.

[0114] FIG. 21 is a diagram showing the results of stress analysis of the models of Example 5 and Comparative Examples 5 and 6. FIG. 22 is a graph showing the stress values of Example 5 and Comparative Examples 5 and 6. Note that in FIG. 22, the maximum stress value generated in each model is shown as a relative value with respect to the maximum stress generated in the model of Comparative Example 5.

[0115] As a result, it can be seen that in Comparative Examples 5 and 6 where there are gaps at the outer peripheral side ends of the coil conductors, bending stress is likely to be applied to the outer peripheral side ends of the coil conductors (see FIG. 21). Also, in order to avoid such stress, it is effective not to provide a gap at the outer peripheral side end of the coil conductor. In Example 5 where there is a gap only at the inner peripheral side end of the coil conductor, it was found that the stress concentration can be alleviated by the stress propagating to the outer peripheral side end of the coil conductor, and as a result, the stress can be significantly alleviated.

[0116] In Embodiments 1 and 2, voids provided in various locations were described. However, in this specification, any voids provided between the coil conductor and the insulating layer only need to be provided in at least a part of the region in the extending direction of the circumferential portion of the coil conductor, and may be provided in the entire region in the extending direction of the circumferential portion, or may be provided only in a part of the region (which may be one region or a plurality of regions) in the extending direction of the circumferential portion.

[0117] Also, in the laminated coil component of the present invention, the presence or absence of voids between the land of the coil conductor and the insulating layer is not particularly limited. For example, a void may be provided between the surface of the land of each coil conductor on the side where the via conductor is not connected and the insulating layer. That is, even in the case of the first coil conductor or the second coil conductor, a void may be provided between the surface of the land on the side where the via conductor is not connected (the surface opposite to the via conductor) and the insulating layer.

[0118] In Embodiments 1 and 2, a horizontally wound laminated inductor was described. However, the laminated coil component of the present invention may be a vertically wound laminated inductor in which the coil is provided such that the coil axis is orthogonal to the mounting surface.

[0119] Hereinafter, an example of a method for manufacturing the laminated coil component of Embodiments 1 and 2 will be described.

[0120] <Manufacturing process of magnetic material> First, Fe2O3, ZnO, CuO, and NiO are weighed so as to have a predetermined ratio.

[0121] Next, these weighed substances, pure water, etc. are put into a ball mill together with PSZ (partially stabilized zirconia) media and mixed, and then pulverized. The mixing and pulverizing time is, for example, 4 hours or more and 8 hours or less.

[0122] Then, the obtained pulverized product is dried and then calcined. The calcination temperature is, for example, 700°C or more and 800°C or less. The calcination time is, for example, 2 hours or more and 5 hours or less.

[0123] In this way, a powdery magnetic material, more specifically, a powdery magnetic ferrite material is produced.

[0124] The ferrite material is preferably a Ni-Cu-Zn-based ferrite material.

[0125] When the total amount of the Ni-Cu-Zn-based ferrite material is 100 mol%, it preferably contains Fe in terms of Fe2O3 of 40 mol% or more and 49.5 mol% or less, Zn in terms of ZnO of 2 mol% or more and 35 mol% or less, Cu in terms of CuO of 6 mol% or more and 13 mol% or less, and Ni in terms of NiO of 10 mol% or more and 45 mol% or less.

[0126] The Ni-Cu-Zn-based ferrite material may further contain additives such as Co, Bi, Sn, and Mn.

[0127] The Ni-Cu-Zn-based ferrite material may further contain unavoidable impurities.

[0128] <Process for producing a green sheet> First, a magnetic material, an organic binder such as polyvinyl butyral resin, an organic solvent such as ethanol and toluene, and a plasticizer, etc. are put into a ball mill together with PSZ media and mixed, and then pulverized to produce a slurry.

[0129] Next, the slurry is formed into a sheet with a predetermined thickness by the doctor blade method or the like, and then punched into a predetermined shape to produce a green sheet. Regarding the thickness of the green sheet, for example, it is set to 20 μm or more and 30 μm or less. Regarding the shape of the green sheet, for example, it is rectangular.

[0130] As the material of the green sheet, instead of the magnetic material, a non-magnetic material such as a borosilicate glass material may be used, or a mixed material of a magnetic material and a non-magnetic material may be used.

[0131] <Conductive Pattern Formation Process> First, via holes are formed by irradiating a predetermined location on the green sheet with a laser.

[0132] Next, after applying a resin paste to the surface of the green sheet by a screen printing method or the like, a conductive paste such as an Ag paste is applied to the surface of the green sheet while filling the via holes by a screen printing method or the like. The resin paste is obtained by containing a resin (such as an acrylic resin) that burns out during firing in a solvent (such as isophorone), and is applied to the location where voids are to be formed. Thereby, a conductor pattern for via conductors is formed in the via holes on the green sheet, and a conductor pattern for coil conductors connected to the conductor pattern for via conductors is formed on the surface of the green sheet via a resin pattern for void formation. After that, a resin paste may be applied on the conductor pattern for coil conductors to further form a resin pattern for void formation. In this way, a coil sheet is produced in which a conductor pattern for coil conductors, a conductor pattern for via conductors, and a resin pattern for void formation are formed on the green sheet. In the coil sheet, a conductor pattern for coil conductors corresponding to the coil conductor 32 shown in FIG. 2 and a conductor pattern for via conductors corresponding to the via conductors 33 (excluding the via conductors 33e and 33f) shown in FIG. 2 are formed. The resin pattern for void formation may be substantially the same as the conductor pattern for coil conductors, and in that case, the line width of the resin pattern for void formation may be made slightly smaller than the line width of the conductor pattern for coil conductors.

[0133] Note that the resin paste does not necessarily need to be applied to the location where voids are to be formed on the land portion. Even in that case, there is a large amount of conductive paste at that location, and voids can be formed adjacent to the land due to the shrinkage of the conductive paste.

[0134] Also, separately from the coil sheet, a via sheet is produced in which a conductor pattern for via conductors corresponding to the via conductors 33e and 33f shown in FIG. 2 and a conductor pattern for lands corresponding to the lands 35e and 35f shown in FIG. 2 are formed.

[0135] <Manufacturing Process of Stacked Body Block> The coil sheet and via sheet are laminated in the stacking direction (length direction L) in the order corresponding to Fig. 2, and then thermocompression bonding is performed to produce a stacked body block.

[0136] <Manufacturing Process of Stacked Body and Coil> First, the stacked body block is cut into a predetermined size using a dicing machine or the like to produce fragmented chips.

[0137] Next, the fragmented chips are fired. The firing temperature is, for example, 900 °C or higher and 920 °C or lower. The firing time is, for example, 2 hours or longer and 4 hours or shorter.

[0138] When the fragmented chips are fired, the green sheets of the coil sheet and via sheet become insulating layers.

[0139] Also, when the fragmented chips are fired, the conductor patterns for coil conductors, via conductors, and lands become coil conductors, via conductors, and lands, respectively. As a result, a coil in which a plurality of coil conductors laminated together with an insulating layer are electrically connected via via conductors is produced. In addition, the resin pattern for void formation burns out and the conductor pattern shrinks more than the green sheet, forming voids.

[0140] As described above, a stacked body in which a plurality of insulating layers are laminated in the stacking direction and a coil is built therein is produced.

[0141] For the stacked body, for example, barrel polishing may be performed to round the corners and ridges.

[0142] <Formation Process of External Electrodes> First, a conductive paste layer is formed by applying a conductive paste such as a paste containing Ag and glass frit to the first end face and the second end face from which the coil is drawn out among the outer surfaces of the stacked body.

[0143] Next, by baking the conductive paste layer, a base electrode of the external electrode is formed. The baking temperature is, for example, 800°C or higher and 820°C or lower. The thickness of the base electrode is, for example, 5 μm.

[0144] Then, on the surface of the base electrode, a Ni-plated electrode and a Sn-plated electrode are sequentially formed by electrolytic plating or the like. Thereby, an external electrode having a base electrode, a Ni-plated electrode, and a Sn-plated electrode in this order is formed.

[0145] As described above, the laminated coil component is manufactured.

[0146] The following contents are disclosed in this specification.

[0147] <1> A laminate in which a plurality of insulating layers are laminated and which has a coil inside, and a first external electrode and a second external electrode electrically connected to the coil, wherein the coil is formed by electrically connecting a plurality of coil conductors laminated together with the insulating layers, the coil conductors are three or more layers, when looking at a cross-section in a direction perpendicular to the direction in which the coil conductors extend, the cross-sectional shape of the coil conductors is a flat shape, defining the coil conductor closest to the center of the laminate in the lamination direction as the first coil conductor, a gap is provided between at least one of the coil conductors other than the first coil conductor and the insulating layer, a laminated coil component in which no gap is provided between the outer peripheral side end of the first coil conductor and the insulating layer.

[0148] <2> The laminated coil component according to <1>, wherein a gap is provided between one side of all the coil conductors other than the first coil conductor and the insulating layer.

[0149] <3> The laminated coil component according to <1> or <2>, wherein no gap is provided between the first coil conductor and the insulating layer.

[0150] <4> The laminated coil component according to <1> or <2>, wherein a gap is provided between the inner peripheral side end of the first coil conductor and the insulating layer.

[0151] <5> The coil conductor is four or more layers and an even number of layers, The coil conductor closer to the center of the laminate in the lamination direction next to the first coil conductor is defined as the second coil conductor, Among the coil conductors other than the first coil conductor and the second coil conductor, a gap is provided between at least one side of the coil conductor and the insulating layer, The laminated coil component according to <1>, wherein no gap is provided between the outer peripheral side end of the first coil conductor and the insulating layer, and between the outer peripheral side end of the second coil conductor and the insulating layer.

[0152] <6> The laminate has a first end face and a second end face opposite to each other in the length direction, a first main face and a second main face opposite to each other in the height direction orthogonal to the length direction, and a first side face and a second side face opposite to each other in the width direction orthogonal to the length direction and the height direction, The coil axis of the coil is parallel to the first main face, The first main face is a mounting face, The laminated coil component according to <1> to <5>, wherein the distance in the height direction between the coil and the first main face is 43 μm or more.

[0153] <7> A laminate formed by laminating a plurality of insulating layers and having a coil inside, A first external electrode and a second external electrode electrically connected to the coil, The coil is formed by electrically connecting a plurality of coil conductors laminated together with the insulating layer. In the laminated coil component, a gap is provided between at least one of the coil conductors and the insulating layer, being biased toward the inner circumferential side of the coil conductor.

[0154] <8> In the laminated coil component according to any one of <1> to <7>, the coil axis of the coil is parallel to the mounting surface.

Description of Signs

[0155] 1, 81 Laminated coil component 10 Laminate 11 First end face 12 Second end face 13 First main face 14 Second main face 15 First side face 16 Second side face 21 First external electrode 22 Second external electrode 30 Coil 31, 31a, 31b, 31c, 31d, 31e, 31f Insulating layer 32, 32a, 32b, 32c, 32d, 132 Coil conductor 33, 33a, 33b, 33c, 33d, 33e, 33f Via conductor 34, 34a, 34b, 34c, 34d Circumferential part 35, 35a, 35b, 35c, 35d, 35e, 35f Land 36 First face 37 Second face 38, 61, 71, 138 Inner circumferential side end 38P Inner circumferential side tip 39, 62, 72, 139 Outer circumferential side end 39P Outer circumferential side tip 41 First lead-out conductor 42 Second lead-out conductor 51, 52, 150 Gap 60, 160 First coil conductor 70 Second coil conductor 82 Substrate 83a, 83b Support part Coil axis of Coil A Center line B Distance G1 in the height direction between the coil and the first main surface Distance G2 in the height direction between the coil and the second main surface

Claims

1. A laminate having a plurality of insulating layers laminated and having a coil inside, a first external electrode and a second external electrode electrically connected to the coil, wherein the coil is formed by electrically connecting a plurality of coil conductors laminated together with the insulating layers, the coil conductors are three or more layers, when looking at a cross-section in a direction perpendicular to the direction in which the coil conductors extend, the cross-sectional shape of the coil conductors is a flat shape, defining the coil conductor closest to the center of the laminate in the lamination direction as the first coil conductor, a gap is provided between at least one side of the coil conductors other than the first coil conductor and the insulating layer, A laminated coil component in which no gap is provided between the outer peripheral side end of the first coil conductor and the insulating layer.

2. The laminated coil component according to claim 1, wherein a gap is provided between one side of all the coil conductors other than the first coil conductor and the insulating layer.

3. The laminated coil component according to claim 1 or 2, wherein no gap is provided between the first coil conductor and the insulating layer.

4. The laminated coil component according to claim 1 or 2, wherein a gap is provided between the inner peripheral side end of the first coil conductor and the insulating layer.

5. the coil conductors are four or more layers and an even number of layers, defining the coil conductor closest to the center of the laminate in the lamination direction next to the first coil conductor as the second coil conductor, a gap is provided between at least one side of the coil conductors other than the first coil conductor and the second coil conductor and the insulating layer, The laminated coil component according to claim 1, wherein no gap is provided between the outer peripheral side end of the first coil conductor and the insulating layer and between the outer peripheral side end of the second coil conductor and the insulating layer.

6. The laminate has a first end face and a second end face opposing in the length direction, a first main face and a second main face opposing in the height direction orthogonal to the length direction, and a first side face and a second side face opposing in the width direction orthogonal to the length direction and the height direction, the coil axis of the coil is parallel to the first main face, the first main face is a mounting face, The laminated coil component according to any one of claims 1, 2 or 5, wherein the distance in the height direction between the coil and the first main face is 43 μm or more.

7. A laminate in which a plurality of insulating layers are laminated and which has a coil inside; a first external electrode and a second external electrode electrically connected to the coil, and the coil is formed by electrically connecting a plurality of coil conductors laminated together with the insulating layer, a laminated coil component in which a gap is provided biased toward the inner peripheral side of the coil conductor between at least one of the coil conductors and the insulating layer.

8. The laminated coil component according to claim 1 or 7, wherein the coil axis of the coil is parallel to the mounting surface.

Images