Laminated coil components

Abstract

To provide a laminated coil component which is capable of responding to a heavy current with low inductance and has a small mounting area.SOLUTION: A laminated coil component 1 comprises: an element assembly 10 which is configured by laminating a plurality of magnetic layers 11 each consisting of metal magnetic particles; a first coil 21 including a first end 30a and a second end 30b consisting of a first conductor layer 51 inside of the element assembly; a second coil 22 which includes a third end 30c and a fourth end 30d consisting of a second conductor layer 52 and is disposed closer to a bottom face of the element assembly than the first coil; a first external electrode 31 and a second external electrode 32 on the bottom face of the element assembly connected to the first end and the second end of the first coil; a third external electrode 33 and a fourth external electrode 34 on the bottom face of the element assembly connected to the third end and the fourth end of the second coil; a first via conductor 41 connecting the first end of the first coil with the first external electrode; a second via conductor 42 connecting the second end of the first coil with the second external electrode; a third via conductor 43 connecting the third end of the second coil with the third external electrode; and a fourth via conductor 44 connecting the fourth end of the second coil with the fourth external electrode.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses a coil component including a magnetic support layer having a first main surface and a second main surface 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, first and second terminal electrodes exposed from the first magnetic resin layer and connected to one end and the other end of the first coil pattern respectively, and third and fourth terminal electrodes exposed from the second magnetic resin layer and connected to one end and the other end of the second coil pattern respectively, wherein the magnetic support layer has a higher magnetic permeability than the first and second magnetic resin layers.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] According to Patent Document 1, since the first coil pattern and the second coil pattern are disposed on the front and back of the magnetic support layer, it is possible to reduce the chip size. Further, Patent Document 1 describes an embodiment in which the number of turns of the first coil pattern and the second coil pattern is about 1 turn each.

[0005] However, there is a demand for inductors that can handle high currents with low inductance and have a small mounting area.

[0006] The present invention was made to solve the above problems and aims to provide a multilayer coil component that can handle high currents with low inductance and has a small mounting area. [Means for solving the problem]

[0007] The laminated coil component of the present invention comprises a base body formed by laminating multiple magnetic layers made of metallic magnetic particles; a first coil disposed inside the base body and composed of a first conductor layer, having a first end and a second end; a second coil disposed inside the base body and composed of a second conductor layer, having a third end and a fourth end, and located on the bottom surface side of the base body than the first coil in the lamination direction of the magnetic layers; a first external electrode provided on the bottom surface of the base body and connected to the first end of the first coil; a second external electrode provided on the bottom surface of the base body and connected to the second end of the first coil; and the base body The device comprises: a third external electrode provided on the bottom surface and connected to the third end of the second coil; a fourth external electrode provided on the bottom surface of the body and connected to the fourth end of the second coil; a first via conductor provided inside the body and connecting the first end of the first coil and the first external electrode; a second via conductor provided inside the body and connecting the second end of the first coil and the second external electrode; a third via conductor provided inside the body and connecting the third end of the second coil and the third external electrode; and a fourth via conductor provided inside the body and connecting the fourth end of the second coil and the fourth external electrode. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a multilayer coil component that can handle high currents with low inductance and has a small mounting area. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to the first embodiment of the present invention. [Figure 2] Figure 2 is a schematic perspective view showing the appearance of the laminated coil component shown in Figure 1. [Figure 3] Figure 3 is an exploded perspective view of the laminated coil component shown in Figure 1. [Figure 4] Figure 4 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to a second embodiment of the present invention. [Figure 5] Figure 5 is an exploded perspective view of the laminated coil component shown in Figure 4. [Figure 6] Figure 6 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to the third embodiment of the present invention. [Figure 7] Figure 7 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to the fourth embodiment of the present invention. [Figure 8] Figure 8 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to the fifth embodiment of the present invention. [Modes for carrying out the invention]

[0010] The laminated coil component of the present invention will be described below. However, the present invention is not limited to the following embodiments and can be modified and applied as appropriate without altering the essence of the invention. Combining two or more of the individual desirable configurations of the present invention described in the following embodiments also constitutes the present invention.

[0011] The multilayer coil component of the present invention is used, for example, as a choke coil in a DC-DC converter. The multilayer coil component of the present invention is also applicable to applications other than choke coils in DC-DC converters.

[0012] Each of the embodiments described below is an exemplification, and it is needless to say that partial replacement or combination of the configurations shown in different embodiments is possible. In the following embodiments after the second embodiment, the description of matters common to the first embodiment will be omitted, and only the differences will be described. In particular, the same operational effects due to the same configuration will not be sequentially mentioned for each embodiment.

[0013] In the following description, when not particularly distinguishing each embodiment, it is simply referred to as "the multilayer coil component of the present invention".

[0014] In this specification, terms indicating the relationship between elements (such as "vertical", "parallel", "orthogonal", etc.) and terms indicating the shape of elements are not expressions representing only strict meanings, but are expressions meaning a substantially equivalent range, for example, including a difference of about several percent. Also, in this specification, "the same" and "equivalent" are not expressions meaning only completely equivalent cases, but are expressions meaning substantially equivalent cases, for example, including a difference of about several percent.

[0015] The drawings shown below are schematic diagrams, and their dimensions, scales of aspect ratios, etc. may be different 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 are denoted by the same reference numerals and redundant descriptions are omitted.

[0016] [First Embodiment] In the multilayer coil component according to the first embodiment of the present invention, a first coil and a second coil are arranged inside the element body.

[0017] FIG. 1 is a perspective view schematically showing an example of the internal structure of the multilayer coil component according to the first embodiment of the present invention. Note that the shapes and arrangements of the multilayer coil component and each component are not limited to the illustrated examples.

[0018] The multilayer coil component 1 shown in FIG. 1 includes a base 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 via conductor 41, a second via conductor 42, a third via conductor 43, and a fourth via conductor 44.

[0019] In FIG. 1, the length direction, width direction, and height direction of the multilayer coil component 1 and the base body 10 are shown as the L direction, W direction, and T direction, respectively. The length direction L, width direction W, and height direction T are orthogonal to each other. The mounting surface of the multilayer coil component 1 is, for example, a surface (LW surface) parallel to the length direction L and the width direction W.

[0020] FIG. 2 is a perspective view schematically showing the appearance of the multilayer coil component shown in FIG. 1.

[0021] The base body 10 is, for example, a rectangular parallelepiped shape or a substantially rectangular parallelepiped shape having six faces. The corners and edges of the base body 10 may be rounded. A corner is a portion where three faces of the base body 10 intersect, and an edge is a portion where two faces of the base body 10 intersect.

[0022] As shown in FIG. 2, the base body 10 has, for example, a first main surface 10a and a second main surface 10b that are opposite to each other in the height direction T, a first side surface 10c and a second side surface 10d that are opposite to each other 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 to each other in the width direction W orthogonal to the length direction L and the height direction T. In the example shown in FIG. 2, the first main surface 10a of the base body 10 corresponds to the bottom surface of the base body 10.

[0023] FIG. 3 is an exploded perspective view of the multilayer coil component shown in FIG. 1.

[0024] The base body 10 is composed of a plurality of magnetic layers 11 laminated. In the example shown in FIG. 3, the lamination direction of the magnetic layers 11 is the height direction T. Note that, in the multilayer coil component 1, the boundaries of the respective layers of the magnetic layer 11 included in the base body 10 may not appear clearly.

[0025] If the base body 10 has a laminated structure of magnetic layers 11, the design freedom of the laminated coil component 1 increases. For example, when manufacturing a laminated coil component 1 that has a first external electrode 31, a second external electrode 32, a third external electrode 33, and a fourth external electrode 34 on the bottom surface (first main surface 10a) of the base body 10, it becomes easier to pull out the first coil 21 and the second coil 22 towards the bottom surface.

[0026] The magnetic layer 11 consists of metallic magnetic particles. Examples of metallic magnetic particles include Fe, Co, Ni, or alloys containing at least one of these. The metallic magnetic particles are preferably Fe particles or Fe alloy particles. Preferred Fe alloys include Fe-Si alloys, Fe-Si-Cr alloys, Fe-Si-Al alloys, Fe-Si-BP-Cu-C alloys, and Fe-Si-B-Nb-Cu alloys.

[0027] It is preferable that the surface of the metallic magnetic particles is covered with an insulating film. Covering the surface of the metallic magnetic particles with an insulating film can increase the insulating properties between the metallic magnetic particles. Methods such as the sol-gel method and the mechanochemical method can be used to form the insulating film on the surface of the metallic magnetic particles. The material constituting the insulating film is preferably an oxide such as P or Si. Alternatively, the insulating film may be an oxide film formed by the oxidation of the surface of the metallic magnetic particles. The thickness of the insulating film is preferably 1 nm to 50 nm, more preferably 1 nm to 30 nm, and even more preferably 1 nm to 20 nm. For example, the thickness of the insulating film covering the surface of the metallic magnetic particles can be measured from the SEM image obtained by photographing a cross-section obtained by polishing a sample of a laminated coil component with a scanning electron microscope (SEM).

[0028] The average particle size of the metallic magnetic particles in the magnetic layer 11 is preferably 1 μm to 30 μm, more preferably 1 μm to 20 μm, and even more preferably 1 μm to 10 μm. The average particle size of the metallic magnetic particles in the magnetic layer 11 can be measured by the procedure described below. A cross-section obtained by cutting a sample of the laminated coil component is photographed using an SEM in multiple locations (e.g., 5 locations) (e.g., 130 μm × 100 μm), and the obtained SEM images are analyzed using image analysis software (e.g., WinROOF 2018 (Mitani Corporation)) to determine the equivalent circle diameter of the metallic magnetic particles. The average value of the obtained equivalent circle diameters is taken as the average particle size of the metallic magnetic particles.

[0029] As shown in Figure 1, a first coil 21 and a second coil 22 are arranged inside the base body 10. Preferably, the first coil 21 and the second coil 22 are magnetically coupled.

[0030] The first coil 21 is composed of a first conductor layer 51 and has a first end 30a and a second end 30b.

[0031] The number of turns in the first coil 21 is preferably less than one turn. The first coil 21 is preferably composed of one conductor layer.

[0032] The second coil 22 is located closer to the bottom surface (first main surface 10a side) of the base body 10 than the first coil 21 in the stacking direction of the magnetic layer 11 (for example, the height direction T).

[0033] 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.

[0034] The number of turns of the second coil 22 is preferably less than one turn. The second coil 22 is preferably composed of one 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.

[0035] In a plan view from the stacking direction (e.g., the height direction T), the first coil 21 is preferably U-shaped with three sides.

[0036] In a plan view from the stacking direction (e.g., the height direction T), the second coil 22 preferably has a U-shape with three sides, and two of its corners are chamfered. The middle side of the three sides may be removed by chamfering.

[0037] Specifically, it is preferable that the second coil 22 includes a bypass portion 55 (see Figure 3) at its corner. The bypass portion 55 of the second coil 22 is preferably positioned inside the first via conductor 41 and inside the second via conductor 42 in a plan view from the stacking direction (e.g., the height direction T) in order to bypass the first via conductor 41 and the second via conductor 42. The shape of the bypass portion 55 is not particularly limited and may be straight or curved. The bypass portion 55 may also be composed of two or more line segments.

[0038] The first external electrode 31 and the second external electrode 32 are provided on the bottom surface (first main surface 10a) of the base 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.

[0039] The third external electrode 33 and the fourth external electrode 34 are provided on the bottom surface (first main surface 10a) of the base 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.

[0040] 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 positioned opposite each other, 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.

[0041] The first external electrode 31 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning the first main surface 10a and at least one of the first side surface 10c and the third side surface 10e of the base body 10.

[0042] The second external electrode 32 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning the first main surface 10a and at least one of the second side surface 10d and the third side surface 10e of the base body 10.

[0043] The third external electrode 33 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning the first main surface 10a and at least one of the first side surface 10c and the fourth side surface 10f of the base body 10.

[0044] The fourth external electrode 34 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning the first main surface 10a and at least one of the second side surface 10d and the fourth side surface 10f of the base body 10.

[0045] The first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 may each be made of a conductive material such as Ag. 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 an underlayer electrode layer containing Ag and one or more plating layers provided on the underlayer electrode layer. The plating layer preferably includes a Cu plating layer provided on the underlayer electrode layer, or includes a Ni plating layer provided on the underlayer electrode layer, and further includes a Sn plating layer provided on the Ni plating layer.

[0046] The thickness of the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 is 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.

[0047] The thickness of external electrodes, such as the first external electrode 31, can be measured by the procedure described below. The sample is polished in the same manner as described above, and the external electrode portion is photographed using an SEM. In the obtained SEM image, one measurement is taken approximately in the center of the external electrode, and this measurement is defined as the thickness of the external electrode.

[0048] The first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 are provided inside the main body 10.

[0049] The first via conductor 41 connects the first end 30a of the first coil 21 to the first external electrode 31. Preferably, the first via conductor 41 extends along the stacking direction (e.g., the height direction T). The first via conductor 41 may have a stacked structure.

[0050] The second via conductor 42 connects the second end 30b of the first coil 21 to the second external electrode 32. Preferably, the second via conductor 42 extends along the stacking direction (e.g., the height direction T). The second via conductor 42 may have a stacked structure.

[0051] The third via conductor 43 connects the third end 30c of the second coil 22 to the third external electrode 33. The third via conductor 43 preferably extends along the stacking direction (e.g., the height direction T). The third via conductor 43 may have a stacked structure.

[0052] The fourth via conductor 44 connects the fourth end 30d of the second coil 22 to the fourth external electrode 34. Preferably, the fourth via conductor 44 extends along the stacking direction (e.g., the height direction T). The fourth via conductor 44 may have a stacked structure.

[0053] In the laminated coil component 1, the bottom surface (first main surface 10a) of the base body 10 can be used as the mounting surface. That is, mounting is possible on the bottom surface of the laminated coil component 1, so the mounting area can be reduced.

[0054] In the laminated 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 via conductor 41, the second via conductor 42, the third via conductor 43, the fourth via conductor 44, the first conductor layer 51, and the second conductor layer 52 may each be formed by printing substantially the same conductor pattern multiple times.

[0055] The shapes of the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 perpendicular to the stacking direction are not particularly limited and can be, for example, polygons such as squares, circles, ellipses, or sectors. In the example shown in Figure 3, the shapes of the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 perpendicular to the stacking direction are sectors. By making the first via conductor 41 and the second via conductor 42, which are located at the corners of the magnetic layer 11 constituting the base body 10, 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 via conductor 43 and the fourth via conductor 44 may be sectors or other shapes.

[0056] It is preferable that the area of ​​the first via conductor 41, second via conductor 42, third via conductor 43, and fourth via conductor 44, as viewed from the stacking direction, is larger than that of the first via conductor 41, second via conductor 42, third via conductor 43, and fourth via conductor 44, respectively, so that they each have the same shape.

[0057] Of the first via conductor 41, second via conductor 42, third via conductor 43, and fourth via conductor 44, it is preferable that at least the third via conductor 43 and the fourth via conductor 44 are not exposed on the side surface of the base body 10. On the other hand, the first via conductor 41 and the second via conductor 42 do not have to be exposed on the side surface of the base body 10, and may be exposed on at least one side surface of the base body 10. By exposing the first via conductor 41 and the second via conductor 42, the avoidance portion 55 can be reduced, and the inner diameter of the second coil 22 can be increased.

[0058] [Second Embodiment] In the laminated coil component according to the second embodiment of the present invention, the distance between the third via conductor and the fourth via conductor is shorter than the distance between the first via conductor and the second via conductor.

[0059] Figure 4 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to a second embodiment of the present invention. Figure 5 is an exploded perspective view of the laminated coil component shown in Figure 4.

[0060] In the laminated coil component 2 shown in Figures 4 and 5, the distance between the third via conductor 43 and the fourth via conductor 44 (length indicated by d2 in Figures 4 and 5) is shorter than the distance between the first via conductor 41 and the second via conductor 42 (length indicated by d1 in Figures 4 and 5).

[0061] Since the first coil 21 is positioned further from the bottom surface (first main surface 10a) of the base body 10 than the second coil 22, the first via conductor 41 and the second via conductor 42 are longer than the third via conductor 43 and the fourth via conductor 44. Therefore, even if the first conductor layer 51 and the second conductor layer 52 were the same shape, the inductance value of the first coil 21, which has longer via conductors, would be greater than the inductance value of the second coil 22, which has shorter via conductors. In addition, the presence of the avoidance portion 55 in the second coil 22 reduces the inner circumference area of ​​the coil, so its inductance value becomes smaller than that of the first coil 21.

[0062] Therefore, by making the distance d2 between the third via conductor 43 and the fourth via conductor 44 shorter than the distance d1 between the first via conductor 41 and the second via conductor 42, the winding angle of the second conductor layer 52 is made larger than that of the first conductor layer 51. This makes it possible to reduce the difference in inductance values ​​between the first coil 21 and the second coil 22.

[0063] Furthermore, by making the distance d2 between the third via conductor 43 and the fourth via conductor 44 shorter than the distance d1 between the first via conductor 41 and the second via conductor 42, the coupling between the first coil 21 and the second coil 22 can be increased.

[0064] The shapes of the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 perpendicular to the stacking direction are not particularly limited and can be, for example, polygons such as squares, circles, ellipses, or sectors. In the example shown in Figure 5, the shapes of the first via conductor 41 and the second via conductor 42 perpendicular to the stacking direction are sectors, and the shapes of the third via conductor 43 and the fourth via conductor 44 perpendicular to the stacking direction are squares or other quadrilaterals. Similar to Figure 3, by making the first via conductor 41 and the second via conductor 42 located at the corners of the magnetic layer 11 constituting the base body 10 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 via conductor 43 and the fourth via conductor 44 may be sectors or other shapes.

[0065] It is preferable that the area of ​​the first via conductor 41, second via conductor 42, third via conductor 43, and fourth via conductor 44, as viewed from the stacking direction, is larger than that of the first via conductor 41, second via conductor 42, third via conductor 43, and fourth via conductor 44, respectively, so that they each have the same shape.

[0066] It is preferable that the distance between the first external electrode 31 and the second external electrode 32 is the same for both the laminated coil component 1 and the laminated coil component 2.

[0067] Similarly, the distance between the third external electrode 33 and the fourth external electrode 34 is preferably the same for both the laminated coil component 1 and the laminated coil component 2. The minimum value of the distance d2 between the third via conductor 43 and the fourth via conductor 44 is preferably the same as the distance between the third external electrode 33 and the fourth external electrode 34.

[0068] Of the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44, it is preferable that at least the third via conductor 43 and the fourth via conductor 44 are not exposed on the side surface of the element 10. On the other hand, the first via conductor 41 and the second via conductor 42 do not have to be exposed on the side surface of the element 10, but may be exposed on at least one side surface of the element 10.

[0069] [Third Embodiment] In the laminated coil component according to the third embodiment of the present invention, the base body further includes an insulating portion made of an insulating material having a lower magnetic permeability than the metallic magnetic particles constituting the magnetic layer, between the layer on which the first coil is arranged and the layer on which the second coil is arranged.

[0070] Figure 6 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to the third embodiment of the present invention.

[0071] In the laminated coil component 3 shown in Figure 6, the base body 10 further includes an insulating portion 60 made of an insulating material with lower magnetic permeability than the metallic magnetic particles constituting the magnetic layer 11, between the layer in which the first coil 21 is located and the layer in which the second coil 22 is located.

[0072] In a plan view from the stacking direction (e.g., height direction T), the insulating portion 60 has a shape that follows the first coil 21. Therefore, the first coil 21 overlaps with the insulating portion 60 in a plan view from the stacking direction (e.g., height direction T). On the other hand, the second coil 22 has a portion that does not overlap with the insulating portion 60 in a plan view from the stacking direction (e.g., height direction T).

[0073] In a plan view from the stacking direction (for example, the height direction T), the insulating portion 60 is preferably U-shaped with three sides.

[0074] By placing an insulating portion 60 with a lower magnetic permeability than the magnetic layer 11 between the first coil 21 and the second coil 22, the insulating properties of the element 10 can be improved, and the coupling between the first coil 21 and the second coil 22 can be increased.

[0075] As shown in Figure 6, it is preferable that the insulating portion 60 has a portion that is wider than the width of the first coil 21. In this case, the portion that is wider than the width of the first coil 21 may be the entire insulating portion 60 or may be a part of the insulating portion 60. Furthermore, it is preferable that the insulating portion 60 has a portion that is longer than the tip of the first coil 21. In this case, the insulating portion 60 may have a portion that is longer than the first end 30a of the first coil 21, a portion that is longer than the second end 30b of the first coil 21, or both.

[0076] The insulating material constituting the insulating portion 60 is preferably composed of metallic magnetic particles with a smaller average particle size than the metallic magnetic particles constituting the magnetic layer 11. Generally, even if the composition of metallic magnetic particles is the same in the magnetic layer and the insulating portion, a smaller average particle size results in lower magnetic permeability and improved insulation. Since metallic magnetic particles with a larger 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.

[0077] The average particle size of the metallic 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 even more preferably 0.5 μm or more and 2 μm or less.

[0078] Alternatively, the insulating material constituting the insulating portion 60 may be a non-magnetic material. In that case, the insulating material constituting the insulating portion 60 may be, for example, a resin material or a ceramic material.

[0079] The thickness of the insulating portion 60 may be greater than the thickness of the first conductor layer 51, less than the thickness of the first conductor layer 51, or equal to 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, less than the thickness of the second conductor layer 52, or equal to the thickness of the second conductor layer 52.

[0080] 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.

[0081] In addition, in the third embodiment of the present invention, an insulating portion may be arranged between the first coil and the second coil as described in the first embodiment, or between the first coil and the second coil as described in the second embodiment.

[0082] [Fourth Embodiment] 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 base body.

[0083] Figure 7 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to the fourth embodiment of the present invention.

[0084] The laminated coil component 4 shown in Figure 7 comprises a base 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 via conductor 41, a second via conductor 42, a third via conductor 43, and a fourth via conductor 44. The laminated coil component 4 further comprises 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 via conductor 45, a sixth via conductor 46, a seventh via conductor 47, and an eighth via conductor 48.

[0085] In the laminated coil component 4, the first coil unit 71 is composed of the first coil 21 and the second coil 22, and the second coil unit 72 is composed of the third coil 23 and the fourth coil 24.

[0086] In the laminated coil component 4, the first coil unit 71 and the second coil unit 72 are adjacent to each other and facing the same direction. In the example shown in Figure 7, the first coil unit 71 and the second coil unit 72 are adjacent to each other in the length direction L.

[0087] In the laminated coil component 4, two coil units are arranged inside the base body 10, which allows for a smaller mounting area compared to when two laminated coil components are arranged separately.

[0088] The third coil 23 is composed of a third conductor layer 53 and has a fifth end 30e and a sixth end 30f. Preferably, the thickness of the third conductor layer 53 is the same as the thickness of the first conductor layer 51.

[0089] The number of turns of the third coil 23 is preferably less than one turn. The third coil 23 is preferably composed of 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.

[0090] The fourth coil 24 is located closer to the bottom surface (first main surface 10a side) of the base body 10 than the second coil 22 in the stacking direction of the magnetic layer 11 (for example, the height direction T).

[0091] The fourth coil 24 is composed of 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. Furthermore, the thickness of the fourth conductor layer 54 is preferably the same as the thickness of the second conductor layer 52.

[0092] The number of turns of the fourth coil 24 is preferably less than one turn. The fourth coil 24 is preferably composed of 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. Also, 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.

[0093] In a plan view from the stacking direction (e.g., the height direction T), the third coil 23 is preferably U-shaped with three sides, and more preferably has the same shape as the first coil 21.

[0094] In a plan view from the stacking direction (e.g., the height direction T), the fourth coil 24 is preferably a U-shape with three sides and two corners that have been chamfered, and more preferably the same shape as the second coil 22.

[0095] Specifically, it is preferable that the fourth coil 24 includes a avoidance portion at its corner. The avoidance portion of the fourth coil 24 is preferably positioned inside the fifth via conductor 45 and inside the sixth via conductor 46 in a plan view from the stacking direction (e.g., the height direction T) in order to avoid the fifth via conductor 45 and the sixth via conductor 46. The shape of the avoidance portion is not particularly limited and may be straight or curved. The avoidance portion may also be composed of two or more line segments.

[0096] The fifth external electrode 35 and the sixth external electrode 36 are provided on the bottom surface (first main surface 10a) of the base body 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.

[0097] The seventh external electrode 37 and the eighth external electrode 38 are provided on the bottom surface (first main surface 10a) of the base body 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.

[0098] 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 positioned opposite each other, and the straight line connecting the fifth external electrode 35 and the seventh external electrode 37 does not intersect the straight line connecting the sixth external electrode 36 and the eighth external electrode 38.

[0099] In the example shown in Figure 7, the third external electrode 33 and the fifth external electrode 35 face each other, and the fourth external electrode 34 and the sixth external electrode 36 face each other.

[0100] The first external electrode 31 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning the first main surface 10a and at least one of the first side surface 10c and the third side surface 10e of the base body 10.

[0101] The second external electrode 32 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning the first main surface 10a and at least one of the second side surface 10d and the third side surface 10e of the base body 10.

[0102] The third external electrode 33 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning both the first main surface 10a and the first side surface 10c of the base body 10.

[0103] The fourth external electrode 34 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning both the first main surface 10a and the second side surface 10d of the base body 10.

[0104] The fifth external electrode 35 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning both the first main surface 10a and the first side surface 10c of the base body 10.

[0105] The sixth external electrode 36 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning both the first main surface 10a and the second side surface 10d of the base body 10.

[0106] The seventh external electrode 37 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning the first main surface 10a and at least one of the first side surface 10c and the third side surface 10e of the base body 10.

[0107] The eighth external electrode 38 may be provided only on the first main surface 10a of the base body 10, or it may be provided spanning the first main surface 10a and at least one of the second side surface 10d and the third side surface 10e of the base body 10.

[0108] 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 each be composed 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 each include an underlay electrode layer containing Ag and one or more plating layers provided on the underlay electrode layer. Preferably, the plating layer includes a Cu plating layer provided on the underlay electrode layer, or includes a Ni plating layer provided on the underlay electrode layer, and further includes a Sn plating layer provided on the Ni plating layer.

[0109] The thickness 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 is 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, 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 equal to each other.

[0110] The fifth via conductor 45, the sixth via conductor 46, the seventh via conductor 47, and the eighth via conductor 48 are provided inside the element 10.

[0111] The fifth via conductor 45 connects the fifth end 30e of the third coil 23 to the fifth external electrode 35. Preferably, the fifth via conductor 45 extends along the stacking direction (e.g., the height direction T). The fifth via conductor 45 may have a stacked structure.

[0112] The sixth via conductor 46 connects the sixth end 30f of the third coil 23 to the sixth external electrode 36. The sixth via conductor 46 is preferably extended along the stacking direction (e.g., the height direction T). The sixth via conductor 46 may have a stacked structure.

[0113] The seventh via conductor 47 connects the seventh end 30g of the fourth coil 24 to the seventh external electrode 37. Preferably, the seventh via conductor 47 extends along the stacking direction (e.g., the height direction T). The seventh via conductor 47 may have a stacked structure.

[0114] The eighth via conductor 48 connects the eighth end 30h of the fourth coil 24 to the eighth external electrode 38. Preferably, the eighth via conductor 48 extends along the stacking direction (e.g., the height direction T). The eighth via conductor 48 may have a stacked structure.

[0115] In the laminated coil component 4, one set of first coil units 71 and second coil units 72 may be arranged inside the base body 10, or two or more sets of first coil units 71 and second coil units 72 may be arranged.

[0116] [Fifth Embodiment] In the laminated coil component according to the fifth embodiment of the present invention, the first coil unit and the second coil unit are arranged symmetrically in plane.

[0117] Figure 8 is a schematic perspective view showing an example of the internal structure of a laminated coil component according to the fifth embodiment of the present invention.

[0118] In the laminated coil component 5 shown in Figure 8, the first coil unit 71 and the second coil unit 72 are adjacent to each other, facing opposite directions. Furthermore, the first coil unit 71 and the second coil unit 72 are arranged symmetrically in plane.

[0119] In the example shown in Figure 8, the third external electrode 33 and the eighth external electrode 38 face each other across the plane of symmetry, and the fourth external electrode 34 and the seventh external electrode 37 face each other.

[0120] When the first coil unit 71 and the second coil unit 72 are arranged symmetrically in the orientation shown in Figure 8, 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 can be increased.

[0121] Table 1 shows the coupling coefficients between coils in the laminated coil component 4 shown in Figure 7 and the laminated coil component 5 shown in Figure 8. In Table 1, L1 represents the first coil 21, L2 represents the second coil 22, L3 represents the third coil 23, and L4 represents the fourth coil 24. The coupling coefficients between coils were calculated from the results of 3D magnetic field analysis using magnetic field analysis software Femtet (manufactured by Murata Software Corporation).

[0122] [Table 1]

[0123] Table 1 shows that in laminated coil component 5, where the first coil unit 71 and the second coil unit 72 are arranged symmetrically in the orientation shown in Figure 8, the absolute values ​​of the coupling coefficients between L1-L2 and L3-L4 are larger, indicating higher coupling between coils, compared to laminated coil component 4, where the first coil unit 71 and the second coil unit 72 are not arranged symmetrically.

[0124] In the laminated coil component 5, one set of first coil units 71 and second coil units 72 may be arranged inside the base body 10, or two or more sets of first coil units 71 and second coil units 72 may be arranged. If two or more sets of first coil units 71 and second coil units 72 are arranged inside the base body 10, it is sufficient that at least one set of first coil units 71 and second coil units 72 are arranged symmetrically, but it is preferable that all sets of first coil units 71 and second coil units 72 are arranged symmetrically.

[0125] As described below, in the fourth and fifth embodiments, the first coil unit and the second coil unit may be composed of the first coil and the second coil described in the first embodiment, or they may be composed of the first coil and the second coil described in the second embodiment. In that case, the first coil unit and the second coil unit may be composed of the first coil and the second coil of the same embodiment, or they may be composed of the first coil and the second coil of different embodiments. Furthermore, in at least one of the first coil unit and the second coil unit, an insulating portion may be arranged between the first coil and the second coil.

[0126] In the laminated coil component 4 shown in Figure 7 and the laminated coil component 5 shown in Figure 8, the distance between the 7th via conductor 47 and the 8th via conductor 48 may be shorter than the distance between the 5th via conductor 45 and the 6th via conductor 46.

[0127] The shapes of the fifth via conductor 45, the sixth via conductor 46, the seventh via conductor 47, and the eighth via conductor 48 perpendicular to the stacking direction are not particularly limited and include, for example, polygons such as squares, circles, ellipses, sectors, etc.

[0128] It is preferable that the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 each have the same shape, and that their area as viewed from the stacking direction is larger than that of the fifth via conductor 45, the sixth via conductor 46, the seventh via conductor 47, and the eighth via conductor 48.

[0129] Of the fifth via conductor 45, the sixth via conductor 46, the seventh via conductor 47, and the eighth via conductor 48, it is preferable that at least the seventh via conductor 47 and the eighth via conductor 48 are not exposed on the side surface of the element 10. On the other hand, the fifth via conductor 45 and the sixth via conductor 46 do not have to be exposed on the side surface of the element 10, but may be exposed on at least one side surface of the element 10.

[0130] In the laminated coil component 4 shown in Figure 7 and the laminated coil component 5 shown in Figure 8, the base body 10 may further include an insulating portion made of an insulating material with lower magnetic permeability than the metallic magnetic particles constituting the magnetic layer 11, between the layer in which the third coil 23 is located and the layer in which the fourth coil 24 is located.

[0131] In a plan view from the stacking direction (e.g., height direction T), the insulating portion has a shape that follows the third coil 23. Therefore, the third coil 23 overlaps with the insulating portion in a plan view from the stacking direction (e.g., height direction T). On the other hand, the fourth coil 24 has a portion that does not overlap with the insulating portion in a plan view from the stacking direction (e.g., height direction T).

[0132] In a plan view from the stacking direction (e.g., the height direction T), the insulating portion is preferably U-shaped with three sides.

[0133] The insulating portion preferably has a portion that is wider than the width of the third coil 23. In this case, the portion that is wider than the width of the third coil 23 may be the entire insulating portion or a part of the insulating portion. Furthermore, the insulating portion preferably has a portion that is longer than the tip of the third coil 23. In this case, the insulating portion may have a portion that is longer than the fifth end 30e of the third coil 23, a portion that is longer than the sixth end 30f of the third coil 23, or both.

[0134] The insulating material constituting the insulating portion is preferably composed of metal magnetic particles with an average particle size smaller than the metal magnetic particles constituting the magnetic layer 11.

[0135] This specification discloses the following:

[0136] <1> A base body composed of multiple stacked magnetic layers made of metallic magnetic particles, A first coil is disposed inside the above-mentioned body and is composed of a first conductor layer, having a first end and a second end. The second coil is located inside the above-mentioned body, is composed of a second conductor layer, has a third end and a fourth end, and is positioned on the bottom side of the body than the first coil in the stacking direction of the magnetic layer, A first external electrode is provided on the bottom surface of the above-mentioned body and is connected to the first end of the first coil, A second external electrode is provided on the bottom surface of the above-mentioned base body and is connected to the second end of the first coil, A third external electrode is provided on the bottom surface of the above-mentioned body and is connected to the third end of the second coil, A fourth external electrode is provided on the bottom surface of the above-mentioned body and is connected to the fourth end of the second coil, A first via conductor is provided inside the above-mentioned body and connects the first end of the first coil and the first external electrode, A second via conductor is provided inside the above-mentioned body and connects the second end of the first coil to the second external electrode, A third via conductor is provided inside the above-mentioned body and connects the third end of the second coil to the third external electrode, A laminated coil component comprising a fourth via conductor provided inside the above-mentioned base body, which connects the fourth end of the second coil to the fourth external electrode.

[0137] <2> The number of turns in the first coil and the second coil described above is less than one turn each. <1> The laminated coil component described above.

[0138] <3> The first coil and the second coil described above are each composed of one conductor layer. <2> The laminated coil component described above.

[0139] <4> The first external electrode and the second external electrode, and the third external electrode and the fourth external electrode are positioned opposite each other, and the straight line connecting the first external electrode and the third external electrode does not intersect the straight line connecting the second external electrode and the fourth external electrode. <1> ~ <3> A laminated coil component as described in any one of the following.

[0140] <5> In a plan view from the stacking direction described above, the first coil has a U-shape with three sides, and the second coil has a U-shape with three sides, but with two corners beveled. <4> The laminated coil component described above.

[0141] <6> The distance between the third via conductor and the fourth via conductor is shorter than the distance between the first via conductor and the second via conductor. <4> or <5> The laminated coil component described above.

[0142] <7> The above-described body further includes an insulating portion between the layer on which the first coil is located and the layer on which the second coil is located, which is made of an insulating material having a lower magnetic permeability than the metallic magnetic particles constituting the magnetic layer. In a plan view from the stacking direction, the insulating portion has a shape that follows the first coil. <1> ~ <6> A laminated coil component as described in any one of the following.

[0143] <8> The insulating portion has a portion that is wider than the width of the first coil. <7> The laminated coil component described above.

[0144] <9> The insulating material constituting the insulating portion consists of metal magnetic particles with an average particle size smaller than the metal magnetic particles constituting the magnetic layer. <7> or <8> The laminated coil component described above.

[0145] <10> Of the first via conductor, the second via conductor, the third via conductor, and the fourth via conductor, at least the third via conductor and the fourth via conductor are not exposed on the side surface of the base body. <1> ~ <9> A laminated coil component as described in any one of the following.

[0146] <11> A third coil is arranged inside the above-mentioned body, and is composed of a third conductor layer, and has a fifth end and a sixth end. The fourth coil is located inside the above-mentioned body, is composed of a fourth conductor layer, has seventh and eighth ends, and is positioned on the bottom side of the body than the third coil in the stacking direction, A fifth external electrode is provided on the bottom surface of the above-mentioned body and is connected to the fifth end of the third coil, A sixth external electrode is provided on the bottom surface of the above-mentioned body and is connected to the sixth end of the third coil, A seventh external electrode is provided on the bottom surface of the above-mentioned body and is connected to the seventh end of the fourth coil, An eighth external electrode is provided on the bottom surface of the above-mentioned body and is connected to the eighth end of the fourth coil, A fifth via conductor is provided inside the above-mentioned body and connects the fifth end of the third coil and the fifth external electrode, A sixth via conductor is provided inside the above-mentioned body and connects the sixth end of the third coil and the sixth external electrode, A seventh via conductor is provided inside the above-mentioned body and connects the seventh end of the fourth coil and the seventh external electrode, The above-mentioned body further comprises an eighth via conductor provided inside the above-mentioned body, which connects the eighth end of the fourth coil and the eighth external electrode, The first coil unit is composed of the first coil and the second coil described above. The second coil unit is composed of the third coil and the fourth coil described above. The first coil unit and the second coil unit are arranged next to each other. <1> ~ <10> A laminated coil component as described in any one of the following.

[0147] <12> The first coil unit and the second coil unit are arranged symmetrically in plane. <11> The laminated coil component described above.

[0148] <13> The third external electrode and the eighth external electrode face each other across the plane of symmetry, and the fourth external electrode and the seventh external electrode face each other. <12> The laminated coil component described above. [Explanation of symbols]

[0149] 1, 2, 3, 4, 5 Multilayer coil components 10 Base Body 10a First main surface (base) 10b Second main surface 10c First side 10d Second side 10e Third Aspect 10f Fourth side 11 Magnetic layer 21. First coil 22 Second Coil 23. Third coil 24. Coil 4 30a 1st end 30b 2nd end 30c 3rd end 30d 4th end 30e 5th end 30f 6th end 30g 7th end 30h 8th end 31 1st external electrode 32 2nd external electrode 33 Third external electrode 34 4th external electrode 35 5th external electrode 36 6th external electrode 37 7th external electrode 38 8th external electrode 41 First via conductor 42 Second via conductor 43 Third via conductor 44 Fourth via conductor 45. 5th via conductor 46. ​​Via 6 conductor 47. Via 7 Conductor 48. 8th via conductor 51 First Conductor Layer 52 Second Conductor Layer 53 Third Conductor Layer 54. Fourth Conductor Layer 55 Avoidance part 60 Insulation part 71. First coil unit 72 Second coil unit d1 is the distance between the first via conductor and the second via conductor. d2 is the distance between the third via conductor and the fourth via conductor. L (Length direction) T (height direction) W (width direction)

Claims

1. A base body composed of multiple stacked magnetic layers made of metallic magnetic particles, A first coil is disposed inside the aforementioned body, is composed of a first conductor layer, and has a first end and a second end. The second coil is disposed inside the aforementioned body, is composed of a second conductor layer, has a third end and a fourth end, and is located on the bottom side of the body than the first coil in the stacking direction of the magnetic layer, A first external electrode is provided on the bottom surface of the base body and is connected to the first end of the first coil, A second external electrode is provided on the bottom surface of the base body and is connected to the second end of the first coil, A third external electrode is provided on the bottom surface of the base body and is connected to the third end of the second coil, A fourth external electrode is provided on the bottom surface of the base body and is connected to the fourth end of the second coil, A first via conductor is provided inside the main body and connects the first end of the first coil to the first external electrode, A second via conductor is provided inside the aforementioned body and connects the second end of the first coil to the second external electrode, A third via conductor is provided inside the aforementioned body and connects the third end of the second coil to the third external electrode, The body comprises a fourth via conductor provided inside the main body, which connects the fourth end of the second coil to the fourth external electrode, A laminated coil component in which the distance between the third via conductor and the fourth via conductor is shorter than the distance between the first via conductor and the second via conductor.

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

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

4. The laminated coil component according to claim 1, wherein the first external electrode and the second external electrode and the third external electrode and the fourth external electrode are arranged in positions opposite to each other, and the straight line connecting the first external electrode and the third external electrode does not intersect the straight line connecting the second external electrode and the fourth external electrode.

5. The laminated coil component according to claim 4, wherein, in a plan view from the lamination direction, the first coil has a U-shape with three sides, and the second coil has a U-shape with three sides, but with two corners beveled.

6. The number of turns of the first coil and the second coil is less than one turn each, The first coil and the second coil are each composed of one conductor layer, The laminated coil component according to claim 1, wherein the first external electrode and the second external electrode and the third external electrode and the fourth external electrode are arranged in positions opposite to each other, and the straight line connecting the first external electrode and the third external electrode does not intersect the straight line connecting the second external electrode and the fourth external electrode.

7. The substrate further includes an insulating portion between the layer on which the first coil is located and the layer on which the second coil is located, which is made of an insulating material having a lower magnetic permeability than the metallic magnetic particles constituting the magnetic layer. The laminated coil component according to claim 1, wherein, in a plan view from the lamination direction, the insulating portion has a shape that follows the first coil.

8. The laminated coil component according to claim 7, wherein the insulating portion has a portion that is wider than the width of the first coil.

9. The laminated coil component according to claim 7, wherein the insulating material constituting the insulating portion consists of metal magnetic particles having a smaller average particle size than the metal magnetic particles constituting the magnetic layer.

10. The laminated coil component according to claim 1, wherein at least the third via conductor and the fourth via conductor among the first via conductor, the second via conductor, the third via conductor and the fourth via conductor are not exposed on the side surface of the base body.

11. A third coil is disposed inside the aforementioned body, is composed of a third conductor layer, and has a fifth end and a sixth end. The fourth coil is located inside the aforementioned body, is composed of a fourth conductor layer, has seventh and eighth ends, and is positioned on the bottom side of the body than the third coil in the stacking direction, A fifth external electrode is provided on the bottom surface of the base body and is connected to the fifth end of the third coil, A sixth external electrode is provided on the bottom surface of the base body and is connected to the sixth end of the third coil, A seventh external electrode is provided on the bottom surface of the base body and is connected to the seventh end of the fourth coil, An eighth external electrode is provided on the bottom surface of the base body and is connected to the eighth end of the fourth coil, A fifth via conductor is provided inside the aforementioned body and connects the fifth end of the third coil to the fifth external electrode, A sixth via conductor is provided inside the aforementioned body and connects the sixth end of the third coil to the sixth external electrode, A seventh via conductor is provided inside the aforementioned body and connects the seventh end of the fourth coil to the seventh external electrode, The above body further comprises an eighth via conductor provided inside the above body, which connects the eighth end of the fourth coil and the eighth external electrode, The first coil unit is composed of the first coil and the second coil, The third coil and the fourth coil constitute the second coil unit, The laminated coil component according to any one of claims 1 to 10, wherein the first coil unit and the second coil unit are arranged adjacent to each other.

12. The laminated coil component according to claim 11, wherein the first coil unit and the second coil unit are arranged symmetrically in plane.

13. The laminated coil component according to claim 12, wherein the third external electrode and the eighth external electrode face each other across a plane of symmetry, and the fourth external electrode and the seventh external electrode face each other.

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