Laminated coil component

Abstract

The present invention provides a laminated coil component capable of inducing a large current with a low electric current and having a small mounting area. This laminated coil component is provided with: a body; a first coil disposed inside the body and having a first end and a second end; a second coil disposed inside the body, having a third end and a fourth end, and positioned closer to the bottom surface side of the body than the first coil in the lamination direction of the magnetic layers; a first external electrode connected to a first end of the first coil; a second external electrode connected to a second end of the first coil; a third external electrode connected to a third end of the second coil; a fourth external electrode connected to a fourth end of the second coil; a first conductive conductor connecting a first end of the first coil and the first external electrode; a second conductive conductor connecting a second end of the first coil and a second external electrode; a third conductive conductor connecting a third end of the second coil and a third external electrode; and a fourth conductive conductor connecting a fourth end of the second coil and a fourth external electrode.

Description

Technical Field

[0001] The present invention relates to a stacked coil component. Background Art

[0002] A coil component is disclosed in Patent Document 1, which is characterized by including: a magnetic support layer having a first main surface and a second main surface, wherein the second main surface is located on the opposite side of the first main surface; a first coil pattern disposed on the first main surface of the magnetic support layer; a second coil pattern disposed on the second main surface of the magnetic support layer; a first magnetic resin layer provided on the first main surface of the magnetic support layer and embedding the first coil pattern; a second magnetic resin layer provided on the second main surface of the magnetic support layer and embedding the second coil pattern; a first terminal electrode and a second terminal electrode exposed from the first magnetic resin layer and connected to one end and the other end of the first coil pattern respectively; and a third terminal electrode and a fourth terminal electrode exposed from the second magnetic resin layer and connected to one end and the other end of the second coil pattern respectively, and the magnetic permeability of the magnetic support layer is higher than the magnetic permeabilities of the first magnetic resin layer and the second magnetic resin layer.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-109293

[0004] According to Patent Document 1, since the first coil pattern and the second coil pattern are disposed on the front and back surfaces of the magnetic support layer, the chip size can be miniaturized. And an embodiment is described in Patent Document 1 in which the number of turns of the first coil pattern and the second coil pattern is about one turn respectively.

[0005] However, there is a need for an inductor that can handle a large current with low inductance and has a small mounting area. Summary of the Invention

[0006] The present invention has been completed to solve the above problems, and an object thereof is to provide a stacked coil component that can handle a large current with low inductance and has a small mounting area.

[0007] The stacked coil component of the present invention includes: a green body formed by stacking a plurality of magnetic layers composed of metal magnetic particles; a first coil disposed inside the green body and composed of a first conductor layer, having a first end and a second end; a second coil disposed inside the green body and composed of a second conductor layer, having a third end and a fourth end, the second coil being located closer to the bottom surface side of the green body than the first coil in the stacking direction of the magnetic layers; a first external electrode provided on the bottom surface of the green body and connected to the first end of the first coil; a second external electrode provided on the bottom surface of the green body and connected to the second end of the first coil; a third external electrode provided on the bottom surface of the green body and connected to the third end of the second coil; a fourth external electrode provided on the bottom surface of the green body and connected to the fourth end of the second coil; a first conduction conductor disposed inside the green body, connecting the first end of the first coil and the first external electrode; a second conduction conductor disposed inside the green body, connecting the second end of the first coil and the second external electrode; a third conduction conductor disposed inside the green body, connecting the third end of the second coil and the third external electrode; and a fourth conduction conductor disposed inside the green body, connecting the fourth end of the second coil and the fourth external electrode.

[0008] According to the present invention, it is possible to provide a stacked coil component that can handle a large current with low inductance and has a small mounting area. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 FIG. is a perspective view schematically showing an example of the internal structure of the stacked coil component according to the first embodiment of the present invention.

[0010] Figure 2 is schematically showing Figure 1 the perspective view of the appearance of the stacked coil component shown in

[0011] Figure 3 is Figure 1 the exploded perspective view of the stacked coil component shown in

[0012] Figure 4 FIG. is a perspective view schematically showing an example of the internal structure of the stacked coil component according to the second embodiment of the present invention.

[0013] Figure 5 is Figure 4 the exploded perspective view of the stacked coil component shown in

[0014] Figure 6 FIG. is a perspective view schematically showing an example of the internal structure of the stacked coil component according to the third embodiment of the present invention.

[0015] Figure 7 is a perspective view schematically showing an example of the internal structure of the stacked coil component according to the fourth embodiment of the present invention.

[0016] Figure 8 is a perspective view schematically showing an example of the internal structure of the stacked coil component according to the fifth embodiment of the present invention.

[0017] Explanation of reference numerals

[0018] 1, 2, 3, 4, 5... stacked coil components, 10... green body, 10a... first main surface (bottom surface), 10b... second main surface, 10c... first side surface, 10d... second side surface, 10e... third side surface, 10f... fourth side surface, 11... magnetic layer, 21... first coil, 22... second coil, 23... third coil, 24... fourth coil, 30a... first end, 30b... second end, 30c... third end, 30d... fourth end, 30e... fifth end, 30f... sixth end, 30g... seventh end, 30h... eighth end, 31... first external electrode, 32... second external electrode, 33... third external electrode, 34... fourth external electrode, 35... fifth external electrode, 36... sixth external electrode, 37... seventh external electrode, 38... eighth external electrode, 41... first conduction conductor, 42... second conduction conductor, 43... third conduction conductor, 44... fourth conduction conductor, 45... fifth conduction conductor, 46... sixth conduction conductor, 47... seventh conduction conductor, 48... eighth conduction conductor, 51... first conductor layer, 52... second conductor layer, 53... third conductor layer, 54... fourth conductor layer, 55... avoidance portion, 60... insulating portion, 71... first coil unit, 72... second coil unit, d1... distance between the first conduction conductor and the second conduction conductor, d2... distance between the third conduction conductor and the fourth conduction conductor, L... length direction, T... height direction, W... width direction. Detailed embodiments

[0019] Hereinafter, the stacked coil component of the present invention will be described.

[0020] However, the present invention is not limited to the following embodiments, and can be appropriately modified and applied within the scope of not changing the gist of the present invention. An embodiment formed by combining two or more preferred structures of the present invention described in the following embodiments is also within the scope of the present invention.

[0021] The stacked coil component of the present invention is used, for example, as a choke coil in a DC - DC converter. The stacked coil component of the present invention can also be applied to uses other than the choke coil in a DC - DC converter.

[0022] Taking the following-described respective embodiments as examples, it is of course possible to perform replacement or combination of parts of the structures shown in different embodiments. After the second embodiment, descriptions of matters the same as those in the first embodiment are omitted, and only differences are described. In particular, the same effects brought about by the same structures are not mentioned in sequence for each embodiment.

[0023] In the following description, when not particularly distinguishing between the respective embodiments, it is simply referred to as "the stacked coil component of the present invention".

[0024] In this specification, terms indicating the relationality between elements (such as "vertical", "parallel", "orthogonal", etc.) and terms indicating the shape of elements do not express only strict meanings, but refer to actually equivalent ranges, for example, also including expressions with a difference of about several percent. Further, in this specification, "the same", "equivalent" do not express only the case of complete equivalence, but refer to actually equivalent cases, for example, also including expressions with a difference of about several percent.

[0025] The accompanying drawings shown below are schematic diagrams, and there are cases where their dimensions, scales of aspect ratios, etc. are different from those of actual products. In the figures, the same reference numerals are used for the same part or corresponding parts. Further, in each figure, the same reference numeral is assigned to the same element and repeated descriptions are omitted.

[0026] [First Embodiment]

[0027] In the stacked coil component of the first embodiment of the present invention, a first coil and a second coil are disposed inside a green body.

[0028] Figure 1 It is a perspective view schematically showing an example of the internal structure of the stacked coil component of the first embodiment of the present invention. Further, the shapes and arrangements of the stacked coil component and each constituent element are not limited to the illustrated example.

[0029] Figure 1 The shown stacked coil component 1 includes a green body 10, a first coil 21, a second coil 22, a first external electrode 31, a second external electrode 32, a third external electrode 33, a fourth external electrode 34, a first conduction conductor 41, a second conduction conductor 42, a third conduction conductor 43, and a fourth conduction conductor 44.

[0030] In Figure 1 it, the length direction, width direction, and height direction in the stacked coil component 1 and the green body 10 are respectively represented as the L direction, W direction, and T direction. The length direction L, width direction W, and height direction T are orthogonal to each other. The mounting surface of the stacked coil component 1 is, for example, a surface (LW surface) parallel to the length direction L and the width direction W.

[0031] Figure 2 is a perspective view schematically showing Figure 1 the appearance of the stacked coil component shown.

[0032] The green body 10 has, for example, a rectangular parallelepiped shape or a substantially rectangular parallelepiped shape with six faces. The corners and edges of the green body 10 may also be rounded. A corner is a portion where three faces of the green body 10 intersect, and an edge is a portion where two faces of the green body 10 intersect.

[0033] As Figure 2 shown, the green body 10 has, for example, a first main surface 10a and a second main surface 10b that are opposite in the height direction T, a first side surface 10c and a second side surface 10d that are opposite in the length direction L orthogonal to the height direction T, and a third side surface 10e and a fourth side surface 10f that are opposite in the width direction W orthogonal to the length direction L and the height direction T. In Figure 2 the example shown, the first main surface 10a of the green body 10 corresponds to the bottom surface of the green body 10.

[0034] Figure 3 is Figure 1 an exploded perspective view of the stacked coil component shown.

[0035] The green body 10 is formed by stacking a plurality of magnetic layers 11. In Figure 3 the example shown, the stacking direction of the magnetic layers 11 is the height direction T. Further, in the stacked coil component 1, the boundaries of the respective layers of the magnetic layers 11 included in the green body 10 may not be clearly visible.

[0036] If the green body 10 has a stacked structure of magnetic layers 11, the degree of freedom in the design of the stacked coil component 1 is increased. For example, in the case of manufacturing the stacked coil component 1 having the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 on the bottom surface (first main surface 10a) of the green body 10, it is easy to lead out the first coil 21 and the second coil 22 to the bottom surface side.

[0037] The magnetic layer 11 is composed of metal magnetic particles. As the metal magnetic particles, for example, Fe, Co, Ni, or an alloy containing at least one of these metals can be cited. The metal magnetic particles are preferably Fe particles or Fe alloy particles. As the Fe alloy, Fe—Si-based alloys, Fe—Si—Cr-based alloys, Fe—Si—Al-based alloys, Fe—Si—B—P—Cu—C-based alloys, Fe—Si—B—Nb—Cu-based alloys, etc. are preferred.

[0038] Preferably, the surfaces of the metal magnetic particles are covered with an insulating coating film. If the surfaces of the metal magnetic particles are covered with an insulating coating film, the insulation between the metal magnetic particles can be improved. As a method for forming an insulating coating film on the surfaces of the metal magnetic particles, methods such as the sol-gel method and the mechanochemical method can be used. The material constituting the insulating coating film is preferably an oxide such as P or Si. In addition, the insulating coating film may also be an oxide film formed by oxidizing the surfaces of the metal magnetic particles. The thickness of the insulating coating film is preferably 1 nm or more and 50 nm or less, more preferably 1 nm or more and 30 nm or less, and further preferably 1 nm or more and 20 nm or less. For example, a cross-section obtained by grinding a sample of the stacked coil component can be photographed using a scanning electron microscope (SEM), and based on the obtained SEM photograph, the thickness of the insulating coating film covering the surfaces of the metal magnetic particles can be measured.

[0039] The average particle diameter of the metal magnetic particles in the magnetic layer 11 is preferably 1 μm or more and 30 μm or less, more preferably 1 μm or more and 20 μm or less, and further preferably 1 μm or more and 10 μm or less. The average particle diameter of the metal magnetic particles in the magnetic layer 11 can be measured by the steps described below. Using SEM, multiple areas (e.g., five areas) of a cross-section obtained by cutting a sample of the stacked coil component (e.g., 130 μm × 100 μm) are photographed, and the obtained SEM photographs are analyzed using image analysis software (e.g., WinROOF 2018 (Mitsuya Shoko Co., Ltd.)) to obtain the equivalent circle diameter of the metal magnetic particles. The average value of the obtained equivalent circle diameters is taken as the average particle diameter of the metal magnetic particles.

[0040] As Figure 1 shown, a first coil 21 and a second coil 22 are disposed inside the green body 10. Preferably, the first coil 21 and the second coil 22 are magnetically coupled.

[0041] The first coil 21 is composed of a first conductor layer 51 and has a first end 30a and a second end 30b.

[0042] The number of turns of the first coil 21 is preferably less than one turn. The first coil 21 is preferably composed of one layer of conductor layer.

[0043] The second coil 22 is located closer to the bottom surface side (the first main surface 10a side) of the green body 10 than the first coil 21 in the stacking direction (e.g., the height direction T) of the magnetic layer 11.

[0044] The second coil 22 is composed of a second conductor layer 52 and has a third end 30c and a fourth end 30d. Preferably, the thickness of the second conductor layer 52 is the same as the thickness of the first conductor layer 51.

[0045] The number of turns of the second coil 22 is preferably less than one turn. The second coil 22 is preferably composed of a single layer of conductor layer. The number of turns of the second coil 22 may be the same as or different from the number of turns of the first coil 21.

[0046] When viewed from above in the stacking direction (e.g., the height direction T), the first coil 21 preferably has an I-shaped configuration with three sides.

[0047] When viewed from above in the stacking direction (e.g., the height direction T), the second coil 22 preferably has a shape obtained by chamfering two corners of an I-shaped configuration with three sides. In addition, the middle one of the three sides may disappear due to chamfering.

[0048] Specifically, the second coil 22 preferably includes an avoidance portion 55 at the corners (see Figure 3 ). The avoidance portion 55 of the second coil 22 is preferably disposed inside the first conduction conductor 41 and inside the second conduction conductor 42 when viewed from above in the stacking direction (e.g., the height direction T) so as to avoid the first conduction conductor 41 and the second conduction conductor 42. The shape of the avoidance portion 55 is not particularly limited and may be linear or curved. In addition, the avoidance portion 55 may be composed of two or more line segments.

[0049] The first external electrode 31 and the second external electrode 32 are provided on the bottom surface (the first main surface 10a) of the green body 10 and are electrically connected to the first coil 21. Specifically, the first external electrode 31 is connected to the first end 30a of the first coil 21, and the second external electrode 32 is connected to the second end 30b of the first coil 21.

[0050] The third external electrode 33 and the fourth external electrode 34 are provided on the bottom surface (the first main surface 10a) of the green body 10 and are electrically connected to the second coil 22. Specifically, the third external electrode 33 is connected to the third end 30c of the second coil 22, and the fourth external electrode 34 is connected to the fourth end 30d of the second coil 22.

[0051] Preferably, the first external electrode 31 and the second external electrode 32 and the third external electrode 33 and the fourth external electrode 34 are arranged in opposing positions, and the straight line connecting the first external electrode 31 and the third external electrode 33 does not intersect the straight line connecting the second external electrode 32 and the fourth external electrode 34.

[0052] The first external electrode 31 may be provided only on the first main surface 10a of the green body 10, but may also be provided so as to straddle at least one of the first side surface 10c and the third side surface 10e of the green body 10 and the first main surface 10a.

[0053] The second external electrode 32 may be provided only on the first main surface 10a of the green body 10, but may also be provided across at least one of the second side surface 10d and the third side surface 10e of the green body 10 and the first main surface 10a.

[0054] The third external electrode 33 may be provided only on the first main surface 10a of the green body 10, but may also be provided across at least one of the first side surface 10c and the fourth side surface 10f of the green body 10 and the first main surface 10a.

[0055] The fourth external electrode 34 may be provided only on the first main surface 10a of the green body 10, but may also be provided across at least one of the second side surface 10d and the fourth side surface 10f of the green body 10 and the first main surface 10a.

[0056] The first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 may also be made of a conductive material such as Ag, respectively. For example, the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 each include a base electrode layer containing Ag and one or more coating layers provided on the base electrode layer. The coating layer preferably includes a Cu coating layer provided on the base electrode layer, or includes a Ni coating layer provided on the base electrode layer, and further includes a Sn coating layer provided on the Ni coating layer.

[0057] The thicknesses of the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 are each preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less. The thicknesses of the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 are preferably equal to each other.

[0058] The thickness of the external electrodes such as the first external electrode 31 can be measured by the steps described below. Grind the sample by the same method as the above method, and photograph the part of the external electrode using SEM. Measure one place in the approximate center of the external electrode in the obtained SEM photograph, and define it as the thickness of the external electrode.

[0059] The first conduction conductor 41, the second conduction conductor 42, the third conduction conductor 43, and the fourth conduction conductor 44 are provided inside the green body 10.

[0060] The first conduction conductor 41 connects the first end 30a of the first coil 21 and the first external electrode 31. The first conduction conductor 41 preferably extends along the stacking direction (for example, the height direction T). The first conduction conductor 41 may have a stacked structure.

[0061] The second conductive conductor 42 connects the second end 30b of the first coil 21 to the second external electrode 32. The second conductive conductor 42 preferably extends along the stacking direction (for example, the height direction T). The second conductive conductor 42 may have a stacked structure.

[0062] The third conductive conductor 43 connects the third end 30c of the second coil 22 to the third external electrode 33. The third conductive conductor 43 preferably extends along the stacking direction (for example, the height direction T). The third conductive conductor 43 may have a stacked structure.

[0063] The fourth conductive conductor 44 connects the fourth end 30d of the second coil 22 to the fourth external electrode 34. The fourth conductive conductor 44 preferably extends along the stacking direction (for example, the height direction T). The fourth conductive conductor 44 may have a stacked structure.

[0064] In the stacked coil component 1, the bottom surface (the first main surface 10a) of the green body 10 can be used as the mounting surface. That is, since the mounting on the bottom surface of the stacked coil component 1 can be performed, the mounting area can be reduced.

[0065] In the stacked coil component 1, the first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the first conductive conductor 41, the second conductive conductor 42, the third conductive conductor 43, the fourth conductive conductor 44, the first conductor layer 51, and the second conductor layer 52 may also be formed by printing substantially the same conductor pattern multiple times, respectively.

[0066] The shape of the first conductive conductor 41, the second conductive conductor 42, the third conductive conductor 43, and the fourth conductive conductor 44 perpendicular to the stacking direction is not particularly limited, and for example, polygons such as quadrilaterals, circles, ellipses, sectors, etc. can be cited. Figure 3 In the example shown, the shapes of the first conductive conductor 41, the second conductive conductor 42, the third conductive conductor 43, and the fourth conductive conductor 44 perpendicular to the stacking direction are sectors. Among them, by making the first conductive conductor 41 and the second conductive conductor 42 located at the corners of the magnetic layer 11 constituting the green body 10 into sectors, the avoidance portion 55 can be reduced and the inner diameter of the second coil 22 can be increased. On the other hand, the third conductive conductor 43 and the fourth conductive conductor 44 may be sectors or shapes other than sectors.

[0067] The first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 preferably have a larger area than the first conductive conductor 41, the second conductive conductor 42, the third conductive conductor 43, and the fourth conductive conductor 44 when observed from the stacking direction, so that they are respectively of the same shape.

[0068] Preferably, at least the third conduction conductor 43 and the fourth conduction conductor 44 among the first conduction conductor 41, the second conduction conductor 42, the third conduction conductor 43, and the fourth conduction conductor 44 do not expose on the side surface of the green compact 10. On the other hand, the first conduction conductor 41 and the second conduction conductor 42 may not expose on the side surface of the green compact 10 or may expose on at least one side surface of the green compact 10. By exposing the first conduction conductor 41 and the second conduction conductor 42, the avoidance portion 55 can be reduced, and the inner diameter of the second coil 22 can be increased.

[0069] [Second Embodiment]

[0070] In the laminated coil component according to the second embodiment of the present invention, the distance between the third conduction conductor and the fourth conduction conductor is shorter than the distance between the first conduction conductor and the second conduction conductor.

[0071] Figure 4 is a perspective view schematically showing an example of the internal structure of the laminated coil component according to the second embodiment of the present invention. Figure 5 is Figure 4 an exploded perspective view of the laminated coil component shown.

[0072] In Figure 4 and Figure 5 the laminated coil component 2 shown, the distance between the third conduction conductor 43 and the fourth conduction conductor 44 (in Figure 4 and Figure 5 , is the length represented by d2) is shorter than the distance between the first conduction conductor 41 and the second conduction conductor 42 (in Figure 4 and Figure 5 , is the length represented by d1).

[0073] Since the first coil 21 is arranged at a position farther from the bottom surface (the first main surface 10a) of the green compact 10 than the second coil 22, the first conduction conductor 41 and the second conduction conductor 42 are longer than the third conduction conductor 43 and the fourth conduction conductor 44. Therefore, even if the first conductor layer 51 and the second conductor layer 52 have the same shape, the inductance value of the first coil 21 with the longer conduction conductor is larger than the inductance value of the second coil 22 with the shorter conduction conductor. In addition, since the avoidance portion 55 exists in the second coil 22, the inner peripheral area of the coil is reduced, and thus the inductance value is smaller than that of the first coil 21.

[0074] Therefore, by making the distance d2 between the third conduction conductor 43 and the fourth conduction conductor 44 shorter than the distance d1 between the first conduction conductor 41 and the second conduction conductor 42, the winding angle of the second conductor layer 52 is made larger than that of the first conductor layer 51. Thereby, the difference in the inductance values between the first coil 21 and the second coil 22 can be reduced.

[0075] Further, by making the distance d2 between the third conductive conductor 43 and the fourth conductive conductor 44 shorter than the distance d1 between the first conductive conductor 41 and the second conductive conductor 42, the coupling between the first coil 21 and the second coil 22 can be improved.

[0076] The shape of the first conductive conductor 41, the second conductive conductor 42, the third conductive conductor 43, and the fourth conductive conductor 44 perpendicular to the stacking direction is not particularly limited. For example, polygons such as quadrilaterals, circles, ellipses, sectors, etc. can be cited. In Figure 5 the example shown, the shape of the first conductive conductor 41 and the second conductive conductor 42 perpendicular to the stacking direction is a sector, and the shape of the third conductive conductor 43 and the fourth conductive conductor 44 perpendicular to the stacking direction is a quadrilateral such as a square. Similar to Figure 3 the above, by making the first conductive conductor 41 and the second conductive conductor 42 located at the corners of the magnetic layer 11 constituting the green body 10 into sectors, the avoidance portion 55 can be reduced and the inner diameter of the second coil 22 can be increased. On the other hand, the third conductive conductor 43 and the fourth conductive conductor 44 can be sectors or shapes other than sectors.

[0077] The first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 preferably have an area larger than that of the first conductive conductor 41, the second conductive conductor 42, the third conductive conductor 43, and the fourth conductive conductor 44 when viewed from the stacking direction, so that they are respectively of the same shape.

[0078] The distance between the first external electrode 31 and the second external electrode 32 is preferably the same in the stacked coil member 1 and the stacked coil member 2.

[0079] Similarly, the distance between the third external electrode 33 and the fourth external electrode 34 is preferably the same in the stacked coil member 1 and the stacked coil member 2. The minimum value of the distance d2 between the third conductive conductor 43 and the fourth conductive conductor 44 is preferably the same as the distance between the third external electrode 33 and the fourth external electrode 34.

[0080] Preferably, at least the third conductive conductor 43 and the fourth conductive conductor 44 among the first conductive conductor 41, the second conductive conductor 42, the third conductive conductor 43, and the fourth conductive conductor 44 do not expose on the side surface of the green body 10. On the other hand, the first conductive conductor 41 and the second conductive conductor 42 may not expose on the side surface of the green body 10 or may expose on at least one side surface of the green body 10.

[0081] [Third Embodiment]

[0082] In the stacked coil component according to the third embodiment of the present invention, the green body further includes an insulating portion between the layer in which the first coil is disposed and the layer in which the second coil is disposed, and the insulating portion is made of an insulating material having a magnetic permeability lower than that of the metal magnetic particles constituting the magnetic layer.

[0083] Figure 6 FIG. 4 is a perspective view schematically showing an example of the internal structure of the stacked coil component according to the third embodiment of the present invention.

[0084] In Figure 6 In the stacked coil component 3 shown in FIG. 4, the green body 10 further includes an insulating portion 60 between the layer in which the first coil 21 is disposed and the layer in which the second coil 22 is disposed, and the insulating portion 60 is made of an insulating material having a magnetic permeability lower than that of the metal magnetic particles constituting the magnetic layer 11.

[0085] When viewed from above in the stacking direction (for example, the height direction T), the insulating portion 60 has a shape along the first coil 21. Therefore, when viewed from above in the stacking direction (for example, the height direction T), the first coil 21 overlaps with the insulating portion 60. On the other hand, when viewed from above in the stacking direction (for example, the height direction T), the second coil 22 has a portion that does not overlap with the insulating portion 60.

[0086] Preferably, when viewed from above in the stacking direction (for example, the height direction T), the insulating portion 60 has an I-shaped cross section with three sides.

[0087] By disposing the insulating portion 60 having a magnetic permeability lower than that of the magnetic layer 11 between the first coil 21 and the second coil 22, the insulation of the green body 10 can be improved, and the coupling between the first coil 21 and the second coil 22 can be enhanced.

[0088] As Figure 6 shown, the insulating portion 60 preferably has a portion wider than the width of the first coil 21. In this case, the portion wider than the width of the first coil 21 may be the entire insulating portion 60 or a part of the insulating portion 60. Further, the insulating portion 60 preferably has a portion longer than the leading end of the first coil 21. In this case, the insulating portion 60 may have a portion longer than the first end 30a of the first coil 21, or may have a portion longer than the second end 30b of the first coil 21, or may have both.

[0089] The insulating material forming the insulating portion 60 is preferably composed of metal magnetic particles having an average particle size smaller than that of the metal magnetic particles forming the magnetic layer 11. Generally speaking, even if the composition of the metal magnetic particles in the magnetic layer and the insulating portion is the same, the magnetic permeability of the one with a smaller average particle size is smaller, and the insulation property can be further improved. Since metal magnetic particles with a large average particle size are arranged between the openings of the insulating portion 60, the inductance value of the second coil 22 increases, and the difference in inductance values between the first coil 21 and the second coil 22 can be reduced.

[0090] The average particle size of the metal magnetic particles in the insulating portion 60 is preferably 0.2 μm or more and 5 μm or less, more preferably 0.3 μm or more and 3 μm or less, and still more preferably 0.5 μm or more and 2 μm or less.

[0091] Alternatively, the insulating material forming the insulating portion 60 may also be a non-magnetic material. In this case, the insulating material forming the insulating portion 60 may be, for example, a resin material or a ceramic material.

[0092] The thickness of the insulating portion 60 may be greater than the thickness of the first conductor layer 51, may be less than the thickness of the first conductor layer 51, or may be the same as the thickness of the first conductor layer 51. Similarly, the thickness of the insulating portion 60 may be greater than the thickness of the second conductor layer 52, may be less than the thickness of the second conductor layer 52, or may be the same as the thickness of the second conductor layer 52.

[0093] The thickness of the insulating portion 60 is preferably 10 μm or more and 60 μm or less, more preferably 20 μm or more and 30 μm or less.

[0094] In addition, in the third embodiment of the present invention, an insulating portion may be arranged between the first coil and the second coil described in the first embodiment, or an insulating portion may be arranged between the first coil and the second coil described in the second embodiment.

[0095] [Fourth Embodiment]

[0096] In the laminated coil component according to the fourth embodiment of the present invention, a third coil and a fourth coil are further arranged inside the green body.

[0097] Figure 7 It is a perspective view schematically showing an example of the internal structure of the laminated coil component according to the fourth embodiment of the present invention.

[0098] Figure 7The stacked coil component 4 shown has a green sheet 10, a first coil 21, a second coil 22, a first external electrode 31, a second external electrode 32, a third external electrode 33, a fourth external electrode 34, a first conduction conductor 41, a second conduction conductor 42, a third conduction conductor 43, and a fourth conduction conductor 44. The stacked coil component 4 further has a third coil 23, a fourth coil 24, a fifth external electrode 35, a sixth external electrode 36, a seventh external electrode 37, an eighth external electrode 38, a fifth conduction conductor 45, a sixth conduction conductor 46, a seventh conduction conductor 47, and an eighth conduction conductor 48.

[0099] In the stacked coil component 4, a first coil unit 71 is formed by the first coil 21 and the second coil 22, and a second coil unit 72 is formed by the third coil 23 and the fourth coil 24.

[0100] In the stacked coil component 4, the first coil unit 71 and the second coil unit 72 are arranged adjacent to each other in the same direction. In Figure 7 the example shown, the first coil unit 71 and the second coil unit 72 are arranged adjacent to each other in the length direction L.

[0101] In the stacked coil component 4, since two coil units are arranged inside the green sheet 10, the mounting area can be reduced compared with the case where two stacked coil components are arranged separately.

[0102] The third coil 23 is formed by a third conductor layer 53 and has a fifth end 30e and a sixth end 30f. The thickness of the third conductor layer 53 is preferably the same as the thickness of the first conductor layer 51.

[0103] The number of turns of the third coil 23 is preferably less than one turn. The third coil 23 is preferably formed by one conductor layer. The number of turns of the third coil 23 may be the same as or different from the number of turns of the first coil 21.

[0104] The fourth coil 24 is located closer to the bottom surface side (first main surface 10a side) of the green sheet 10 than the second coil 22 in the stacking direction of the magnetic layer 11 (for example, the height direction T).

[0105] The fourth coil 24 is formed by a fourth conductor layer 54 and has a seventh end 30g and an eighth end 30h. The thickness of the fourth conductor layer 54 is preferably the same as the thickness of the third conductor layer 53. Additionally, the thickness of the fourth conductor layer 54 is preferably the same as the thickness of the second conductor layer 52.

[0106] The number of turns of the fourth coil 24 is preferably less than one turn. The fourth coil 24 is preferably formed by one conductor layer. The number of turns of the fourth coil 24 may be the same as or different from the number of turns of the third coil 23. Additionally, the number of turns of the fourth coil 24 may be the same as or different from the number of turns of the second coil 22.

[0107] When viewed from above in the stacking direction (e.g., the height direction T), the third coil 23 preferably has an I-shaped configuration with three sides, and more preferably has the same shape as the first coil 21.

[0108] When viewed from above in the stacking direction (e.g., the height direction T), the fourth coil 24 preferably has a shape in which two corners of an I-shaped configuration with three sides are chamfered, and more preferably has the same shape as the second coil 22.

[0109] Specifically, the fourth coil 24 preferably includes avoidance portions at the corners. The avoidance portions of the fourth coil 24 are preferably arranged inside the fifth conduction conductor 45 and inside the sixth conduction conductor 46 when viewed from above in the stacking direction (e.g., the height direction T) so as to avoid the fifth conduction conductor 45 and the sixth conduction conductor 46. The shape of the avoidance portions is not particularly limited and may be linear or curved. In addition, the avoidance portions may be formed of two or more line segments.

[0110] The fifth external electrode 35 and the sixth external electrode 36 are provided on the bottom surface (the first main surface 10a) of the green compact 10 and are electrically connected to the third coil 23. Specifically, the fifth external electrode 35 is connected to the fifth end 30e of the third coil 23, and the sixth external electrode 36 is connected to the sixth end 30f of the third coil 23.

[0111] The seventh external electrode 37 and the eighth external electrode 38 are provided on the bottom surface (the first main surface 10a) of the green compact 10 and are electrically connected to the fourth coil 24. Specifically, the seventh external electrode 37 is connected to the seventh end 30g of the fourth coil 24, and the eighth external electrode 38 is connected to the eighth end 30h of the fourth coil 24.

[0112] Preferably, the fifth external electrode 35 and the sixth external electrode 36 and the seventh external electrode 37 and the eighth external electrode 38 are arranged in positions facing each other, and the straight line connecting the fifth external electrode 35 and the seventh external electrode 37 does not cross the straight line connecting the sixth external electrode 36 and the eighth external electrode 38.

[0113] In Figure 7 the example shown, the third external electrode 33 faces the fifth external electrode 35, and the fourth external electrode 34 faces the sixth external electrode 36.

[0114] The first external electrode 31 may be provided only on the first main surface 10a of the green compact 10, or may be provided so as to straddle at least one of the first side surface 10c and the third side surface 10e of the green compact 10 and the first main surface 10a.

[0115] The second external electrode 32 may be provided only on the first main surface 10a of the green body 10, or may be provided across at least one of the second side surface 10d and the third side surface 10e of the green body 10 and the first main surface 10a.

[0116] The third external electrode 33 may be provided only on the first main surface 10a of the green body 10, or may be provided across the first main surface 10a and the first side surface 10c of the green body 10.

[0117] The fourth external electrode 34 may be provided only on the first main surface 10a of the green body 10, or may be provided across the first main surface 10a and the second side surface 10d of the green body 10.

[0118] The fifth external electrode 35 may be provided only on the first main surface 10a of the green body 10, or may be provided across the first main surface 10a and the first side surface 10c of the green body 10.

[0119] The sixth external electrode 36 may be provided only on the first main surface 10a of the green body 10, or may be provided across the first main surface 10a and the second side surface 10d of the green body 10.

[0120] The seventh external electrode 37 may be provided only on the first main surface 10a of the green body 10, or may be provided across at least one of the first side surface 10c and the fourth side surface 10e of the green body 10 and the first main surface 10a.

[0121] The eighth external electrode 38 may be provided only on the first main surface 10a of the green body 10, or may be provided across at least one of the second side surface 10d and the fourth side surface 10e of the green body 10 and the first main surface 10a.

[0122] The first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 may be respectively formed of a conductive material such as Ag. For example, the first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 respectively include a base electrode layer containing Ag and one or more plating layers provided on the base electrode layer. Preferably, the plating layer includes a Cu plating layer provided on the base electrode layer, or includes a Ni plating layer provided on the base electrode layer, and further includes a Sn plating layer provided on the Ni plating layer.

[0123] The thicknesses of the first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 are each preferably 5 μm or more and 100 μm or less, more preferably 10 μm or more and 50 μm or less. The thicknesses of the first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 are preferably the same as each other.

[0124] The fifth conduction conductor 45, the sixth conduction conductor 46, the seventh conduction conductor 47, and the eighth conduction conductor 48 are provided inside the green body 10.

[0125] The fifth conduction conductor 45 connects the fifth end 30e of the third coil 23 to the fifth external electrode 35. The fifth conduction conductor 45 preferably extends along the stacking direction (e.g., the height direction T). The fifth conduction conductor 45 may have a stacked structure.

[0126] The sixth conduction conductor 46 connects the sixth end 30f of the third coil 23 to the sixth external electrode 36. The sixth conduction conductor 46 preferably extends along the stacking direction (e.g., the height direction T). The sixth conduction conductor 46 may have a stacked structure.

[0127] The seventh conduction conductor 47 connects the seventh end 30g of the fourth coil 24 to the seventh external electrode 37. The seventh conduction conductor 47 preferably extends along the stacking direction (e.g., the height direction T). The seventh conduction conductor 47 may have a stacked structure.

[0128] The eighth conduction conductor 48 connects the eighth end 30h of the fourth coil 24 to the eighth external electrode 38. The eighth conduction conductor 48 preferably extends along the stacking direction (e.g., the height direction T). The eighth conduction conductor 48 may have a stacked structure.

[0129] In the stacked coil component 4, a set of the first coil unit 71 and the second coil unit 72 may be arranged inside the green body 10, or two or more sets of the first coil unit 71 and the second coil unit 72 may be arranged.

[0130] [Fifth Embodiment]

[0131] In the stacked coil component according to the fifth embodiment of the present invention, the first coil unit and the second coil unit are arranged symmetrically with respect to each other.

[0132] Figure 8 is a perspective view schematically showing an example of the internal structure of the stacked coil component according to the fifth embodiment of the present invention.

[0133] In Figure 8In the stacked coil component 5 shown, the first coil unit 71 and the second coil unit 72 are arranged adjacent to each other in opposite directions. Moreover, the first coil unit 71 and the second coil unit 72 are arranged symmetrically.

[0134] In Figure 8 the example shown, the third external electrode 33 and the eighth external electrode 38 are opposed to each other with a symmetry plane therebetween, and the fourth external electrode 34 and the seventh external electrode 37 are opposed to each other with a symmetry plane therebetween.

[0135] When the first coil unit 71 and the second coil unit 72 are arranged symmetrically with the orientations shown Figure 8 it is possible to increase the coupling between the first coil 21 and the second coil 22 and the coupling between the third coil 23 and the fourth coil 24.

[0136] Shown in Table 1 are Figure 7 the coupling coefficients between the coils in the stacked coil component 4 shown Figure 8 and the stacked coil component 5 shown. In Table 1, L1 refers to the first coil 21, L2 refers to the second coil 22, L3 refers to the third coil 23, and L4 refers to the fourth coil 24. In addition, the coupling coefficients between the coils are calculated based on the 3D magnetic field analysis results of the magnetic field analysis software Femtet (manufactured by Murata Software Co., Ltd.).

[0137] [Table 1]

[0138]

[0139] From Table 1, it can be seen that in the stacked coil component 5 in which the first coil unit 71 and the second coil unit 72 are arranged symmetrically with the Figure 8 shown orientations, the absolute values of the coupling coefficients between L1 - L2 and L3 - L4 are larger and the coupling between the coils is higher than in the stacked coil component 4 in which the first coil unit 71 and the second coil unit 72 are not arranged symmetrically.

[0140] In the stacked coil component 5, a set of the first coil unit 71 and the second coil unit 72 can be arranged inside the green body 10, or two or more sets of the first coil unit 71 and the second coil unit 72 can be arranged. When two or more sets of the first coil unit 71 and the second coil unit 72 are arranged inside the green body 10, it is sufficient that at least one set of the first coil unit 71 and the second coil unit 72 is arranged symmetrically, but it is preferred that all sets of the first coil unit 71 and the second coil unit 72 are arranged symmetrically.

[0141] As described below, in the fourth and fifth embodiments, the first coil unit and the second coil unit may be constituted by the first coil and the second coil described in the first embodiment, or may be constituted by the first coil and the second coil described in the second embodiment. In this case, the first coil unit and the second coil unit may be constituted by the first coil and the second coil of the same embodiment, or may be constituted by the first coil and the second coil of different embodiments. Further, an insulating portion may be disposed between the first coil and the second coil in at least one of the first coil unit and the second coil unit.

[0142] In Figure 7 the stacked coil component 4 shown in Figure 8 and the stacked coil component 5 shown in

[0143] The shape of the fifth conduction conductor 45, the sixth conduction conductor 46, the seventh conduction conductor 47, and the eighth conduction conductor 48 perpendicular to the stacking direction is not particularly limited, and examples thereof include polygons such as quadrilaterals, circles, ellipses, and sectors.

[0144] The areas of the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38, as viewed from the stacking direction, are preferably larger than those of the fifth conduction conductor 45, the sixth conduction conductor 46, the seventh conduction conductor 47, and the eighth conduction conductor 48 so that they have the same shape respectively.

[0145] Preferably, at least the seventh conduction conductor 47 and the eighth conduction conductor 48 among the fifth conduction conductor 45, the sixth conduction conductor 46, the seventh conduction conductor 47, and the eighth conduction conductor 48 are not exposed on the side surface of the green compact 10. On the other hand, the fifth conduction conductor 45 and the sixth conduction conductor 46 may not be exposed on the side surface of the green compact 10, or may be exposed on at least one side surface of the green compact 10.

[0146] In Figure 7 the stacked coil component 4 shown in Figure 8 and the stacked coil component 5 shown in

[0147] When viewed from above in the stacking direction (e.g., the height direction T), the insulating portion has a shape along the third coil 23. Therefore, when viewed from above in the stacking direction (e.g., the height direction T), the third coil 23 overlaps with the insulating portion. On the other hand, when viewed from above in the stacking direction (e.g., the height direction T), the fourth coil 24 has a portion that does not overlap with the insulating portion.

[0148] Preferably, when viewed from above in the stacking direction (e.g., the height direction T), the insulating portion has an I-shaped configuration with three sides.

[0149] The insulating portion preferably has a portion with a width wider than the width of the third coil 23. In this case, the portion with a width wider than the width of the third coil 23 may be the entire insulating portion or a part of the insulating portion. And the insulating portion preferably has a portion longer than the front end of the third coil 23. In this case, the insulating portion may have a portion longer than the fifth end 30e of the third coil 23, or may have a portion longer than the sixth end 30f of the third coil 23, or may have both.

[0150] The insulating material constituting the insulating portion is preferably composed of metal magnetic particles having an average particle diameter smaller than the average particle diameter of the metal magnetic particles constituting the magnetic layer 11.

[0151] This specification discloses the following content.

[0152] <1> A stacked coil component, comprising:

[0153] A green body formed by stacking a plurality of magnetic layers composed of metal magnetic particles;

[0154] A first coil disposed inside the above-mentioned green body and composed of a first conductor layer, having a first end and a second end;

[0155] A second coil disposed inside the above-mentioned green body and composed of a second conductor layer, having a third end and a fourth end, and the second coil is located closer to the bottom surface side of the above-mentioned green body than the first coil in the stacking direction of the above-mentioned magnetic layers;

[0156] A first external electrode provided on the bottom surface of the above-mentioned green body and connected to the first end of the above-mentioned first coil;

[0157] A second external electrode provided on the bottom surface of the above-mentioned green body and connected to the second end of the above-mentioned first coil;

[0158] A third external electrode provided on the bottom surface of the above-mentioned green body and connected to the third end of the above-mentioned second coil;

[0159] A fourth external electrode provided on the bottom surface of the above-mentioned green body and connected to the fourth end of the above-mentioned second coil;

[0160] The first conductive conductor is disposed inside the above-mentioned green body and connects the first end of the above-mentioned first coil to the above-mentioned first external electrode;

[0161] The second conductive conductor is disposed inside the above-mentioned green body and connects the second end of the above-mentioned first coil to the above-mentioned second external electrode;

[0162] The third conductive conductor is disposed inside the above-mentioned green body and connects the third end of the above-mentioned second coil to the above-mentioned third external electrode; and

[0163] The fourth conductive conductor is disposed inside the above-mentioned green body and connects the fourth end of the above-mentioned second coil to the above-mentioned fourth external electrode.

[0164] <2> The laminated coil component according to <1>, wherein

[0165] The number of turns of the above-mentioned first coil and the above-mentioned second coil is less than one turn respectively.

[0166] <3> The laminated coil component according to <2>, wherein

[0167] The above-mentioned first coil and the above-mentioned second coil are each composed of one layer of conductor layer.

[0168] <4> The laminated coil component according to any one of <1> to <3>, wherein

[0169] The above-mentioned first external electrode and the above-mentioned second external electrode are disposed at positions opposite to the above-mentioned third external electrode and the above-mentioned fourth external electrode, and the straight line connecting the above-mentioned first external electrode and the above-mentioned third external electrode does not cross the straight line connecting the above-mentioned second external electrode and the above-mentioned fourth external electrode.

[0170] <5> The laminated coil component according to <4>, wherein

[0171] When viewed from above in the above-mentioned lamination direction, the above-mentioned first coil has an I-shaped shape with three sides, and the above-mentioned second coil has a shape obtained by chamfering two corners of an I-shaped shape with three sides.

[0172] <6> The laminated coil component according to <4> or <5>, wherein

[0173] The distance between the above-mentioned third conductive conductor and the above-mentioned fourth conductive conductor is shorter than the distance between the above-mentioned first conductive conductor and the above-mentioned second conductive conductor.

[0174] <7> The laminated coil component according to any one of <1> to <6>, wherein

[0175] The above-mentioned green body further includes an insulating portion between the layer provided with the above-mentioned first coil and the layer provided with the above-mentioned second coil, and the insulating portion is composed of an insulating material having a magnetic permeability lower than that of the metal magnetic particles constituting the magnetic layer.

[0176] When viewed from above in the stacking direction, the insulating portion has a shape along the above-mentioned first coil.

[0177] <8>According to the stacked coil component described in <7>, wherein

[0178] The insulating portion has a portion with a width wider than the width of the above-mentioned first coil.

[0179] <9>According to the stacked coil component described in <7> or <8>, wherein

[0180] The insulating material constituting the insulating portion is composed of metal magnetic particles having an average particle size smaller than the average particle size of the metal magnetic particles constituting the magnetic layer.

[0181] <10>According to the stacked coil component described in any one of <1> to <9>, wherein

[0182] At least the above-mentioned third conduction conductor and the above-mentioned fourth conduction conductor among the above-mentioned first conduction conductor, the above-mentioned second conduction conductor, the above-mentioned third conduction conductor, and the above-mentioned fourth conduction conductor do not expose on the side surface of the green body.

[0183] <11>According to the stacked coil component described in any one of <1> to <10>, further comprising:

[0184] A third coil, disposed inside the green body and composed of a third conductor layer, having a fifth end and a sixth end;

[0185] A fourth coil, disposed inside the green body and composed of a fourth conductor layer, having a seventh end and an eighth end, and the fourth coil is located closer to the bottom surface side of the green body than the third coil in the stacking direction;

[0186] A fifth external electrode, disposed on the bottom surface of the green body and connected to the fifth end of the above-mentioned third coil;

[0187] A sixth external electrode, disposed on the bottom surface of the green body and connected to the sixth end of the above-mentioned third coil;

[0188] A seventh external electrode, disposed on the bottom surface of the green body and connected to the seventh end of the above-mentioned fourth coil;

[0189] An eighth external electrode, disposed on the bottom surface of the green body and connected to the eighth end of the above-mentioned fourth coil;

[0190] A fifth conductive conductor is disposed inside the above-mentioned green body and connects the fifth end of the above-mentioned third coil to the above-mentioned fifth external electrode;

[0191] A sixth conductive conductor is disposed inside the above-mentioned green body and connects the sixth end of the above-mentioned third coil to the above-mentioned sixth external electrode;

[0192] A seventh conductive conductor is disposed inside the above-mentioned green body and connects the seventh end of the above-mentioned fourth coil to the above-mentioned seventh external electrode; and

[0193] An eighth conductive conductor is disposed inside the above-mentioned green body and connects the eighth end of the above-mentioned fourth coil to the above-mentioned eighth external electrode,

[0194] The first coil unit is composed of the above-mentioned first coil and the above-mentioned second coil,

[0195] The second coil unit is composed of the above-mentioned third coil and the above-mentioned fourth coil,

[0196] The above-mentioned first coil unit and the above-mentioned second coil unit are arranged adjacent to each other.

[0197] <12> The stacked coil component according to <11>, wherein,

[0198] The above-mentioned first coil unit and the above-mentioned second coil unit are arranged symmetrically facing each other.

[0199] <13> The stacked coil component according to <12>, wherein,

[0200] The above-mentioned third external electrode and the above-mentioned eighth external electrode are opposed to each other across a symmetry plane, and the above-mentioned fourth external electrode and the above-mentioned seventh external electrode are opposed to each other across a symmetry plane.

Claims

1. A stacked coil component, comprising: a green body formed by stacking a plurality of magnetic layers composed of metal magnetic particles; a first coil disposed inside the green body and composed of a first conductor layer, having a first end and a second end; a second coil disposed inside the green body and composed of a second conductor layer, having a third end and a fourth end, wherein the second coil is located closer to the bottom surface side of the green body than the first coil in the stacking direction of the magnetic layers; a first external electrode provided on the bottom surface of the green body and connected to the first end of the first coil; a second external electrode provided on the bottom surface of the green body and connected to the second end of the first coil; a third external electrode provided on the bottom surface of the green body and connected to the third end of the second coil; a fourth external electrode provided on the bottom surface of the green body and connected to the fourth end of the second coil; a first conduction conductor disposed inside the green body and connecting the first end of the first coil to the first external electrode; a second conduction conductor disposed inside the green body and connecting the second end of the first coil to the second external electrode; a third conduction conductor disposed inside the green body and connecting the third end of the second coil to the third external electrode; and a fourth conduction conductor disposed inside the green body and connecting the fourth end of the second coil to the fourth external electrode.

2. The stacked coil component according to claim 1, wherein the number of turns of the first coil and the second coil is less than one turn respectively.

3. The stacked coil component according to claim 2, wherein the first coil and the second coil are each composed of one layer of conductor layer.

4. The stacked coil component according to any one of claims 1 to 3, wherein the first external electrode and the second external electrode are disposed at positions opposite to the third external electrode and the fourth external electrode, and the straight line connecting the first external electrode and the third external electrode does not cross the straight line connecting the second external electrode and the fourth external electrode.

5. The stacked coil component according to claim 4, wherein when viewed from the stacking direction, the first coil has an I-shaped configuration with three sides, and the second coil has a shape obtained by chamfering two corners of an I-shaped configuration with three sides.

6. The stacked coil component according to claim 4 or 5, wherein the distance between the third conduction conductor and the fourth conduction conductor is shorter than the distance between the first conduction conductor and the second conduction conductor.

7. The stacked coil component according to any one of claims 1 to 6, wherein the green body further includes an insulating portion between the layer in which the first coil is disposed and the layer in which the second coil is disposed, and the insulating portion is composed of an insulating material having a magnetic permeability lower than that of the metal magnetic particles constituting the magnetic layer, when viewed from the stacking direction, the insulating portion has a shape along the first coil.

8. The stacked coil component according to claim 7, wherein The above-mentioned insulating portion has a part with a width wider than the width of the above-mentioned first coil.

9. The laminated coil component according to claim 7 or 8, wherein The insulating material constituting the above-mentioned insulating portion is composed of metal magnetic particles having an average particle diameter smaller than the average particle diameter of the metal magnetic particles constituting the above-mentioned magnetic layer.

10. The laminated coil component according to any one of claims 1 to 9, wherein At least the above-mentioned third conduction conductor and the above-mentioned fourth conduction conductor among the above-mentioned first conduction conductor, the above-mentioned second conduction conductor, the above-mentioned third conduction conductor, and the above-mentioned fourth conduction conductor are not exposed on the side surface of the green body.

11. The stacked coil component according to any one of claims 1 to 10, wherein, It further includes: A third coil, disposed inside the above-mentioned green body and composed of a third conductor layer, having a fifth end and a sixth end; A fourth coil, disposed inside the above-mentioned green body and composed of a fourth conductor layer, having a seventh end and an eighth end, and the above-mentioned fourth coil is located closer to the bottom surface side of the above-mentioned green body than the above-mentioned third coil in the above-mentioned lamination direction; A fifth external electrode, disposed on the bottom surface of the above-mentioned green body and connected to the above-mentioned fifth end of the above-mentioned third coil; A sixth external electrode, disposed on the bottom surface of the above-mentioned green body and connected to the above-mentioned sixth end of the above-mentioned third coil; A seventh external electrode, disposed on the bottom surface of the above-mentioned green body and connected to the above-mentioned seventh end of the above-mentioned fourth coil; An eighth external electrode, disposed on the bottom surface of the above-mentioned green body and connected to the above-mentioned eighth end of the above-mentioned fourth coil; A fifth conduction conductor, disposed inside the above-mentioned green body and connecting the above-mentioned fifth end of the above-mentioned third coil and the above-mentioned fifth external electrode; A sixth conduction conductor, disposed inside the above-mentioned green body and connecting the above-mentioned sixth end of the above-mentioned third coil and the above-mentioned sixth external electrode; A seventh conduction conductor, disposed inside the above-mentioned green body and connecting the above-mentioned seventh end of the above-mentioned fourth coil and the above-mentioned seventh external electrode; And An eighth conduction conductor, disposed inside the above-mentioned green body and connecting the above-mentioned eighth end of the above-mentioned fourth coil and the above-mentioned eighth external electrode, The above-mentioned first coil and the above-mentioned second coil constitute a first coil unit, The above-mentioned third coil and the above-mentioned fourth coil constitute a second coil unit, The above-mentioned first coil unit and the above-mentioned second coil unit are arranged adjacent to each other.

12. The laminated coil component according to claim 11, wherein The above-mentioned first coil unit and the above-mentioned second coil unit are arranged symmetrically with respect to each other.

13. The laminated coil component according to claim 12, wherein The above-mentioned third external electrode and the above-mentioned eighth external electrode are opposed to each other across a symmetry plane, and the above-mentioned fourth external electrode and the above-mentioned seventh external electrode are opposed to each other across a symmetry plane.

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