Multilayer coil components

Abstract

To provide a laminated coil component which achieves improvement of inductance and improvement of insulation properties between conductor parts.SOLUTION: The laminated coil component includes an element assembly including a plurality of metal magnetic particles MM and a resin RE existing between the plurality of metal magnetic particles, and a coil that is arranged in the element assembly and includes a plurality of mutually electrically connected coil conductors C. At least a part of the plurality of coil conductors has a spiral shape, and has conductor parts SC1 adjacent to each other when viewed from a direction along a coil axis of the coil. The plurality of metal magnetic particles MM included in the element assembly has a particle diameter a third or more and a half or less a distance between the mutually adjacent conductor parts in the coil conductor C. The metal magnetic particles MM having the particle diameter are aligned in an opposite direction of the conductor parts between the mutually adjacent conductor parts in the coil conductor.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] A multilayer coil component is known that includes an element body and a plurality of spirally wound coil conductors (see, for example, Patent Document 1). The element body includes a plurality of metal magnetic particles and a resin present between the plurality of metal magnetic particles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-98278 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of one aspect of the present invention is to provide a laminated coil component that can improve inductance and insulation between conductor portions. [Means for solving the problem]

[0005] A laminated coil component according to one aspect of the present invention comprises: an element body containing a plurality of metal magnetic particles and a resin present between the plurality of metal magnetic particles; and a coil comprising a plurality of coil conductors arranged within the element body and electrically connected to each other, at least some of the plurality of coil conductors being spirally shaped and having conductor portions that are adjacent to each other when viewed from a direction along the coil axis of the coil; the plurality of metal magnetic particles contained in the element body include a plurality of metal magnetic particles having a particle diameter that is between 1 / 3 and 1 / 2 of the distance between adjacent conductor portions in the coil conductor; and between adjacent conductor portions in the coil conductor, the metal magnetic particles having the particle diameter are aligned along the opposing direction of the conductor portions.

[0006] In a laminated coil component according to one aspect of the present invention, the magnetic permeability of metal magnetic particles having a particle diameter equal to or greater than one-third of the distance between adjacent conductor portions in the opposing direction is higher than the magnetic permeability of metal magnetic particles having a particle diameter smaller than one-third of the distance between adjacent conductor portions in the opposing direction. Hereinafter, the distance between adjacent conductor portions in the opposing direction is referred to as the "distance between conductor portions." In the laminated coil component, a plurality of metal magnetic particles having a particle diameter equal to or greater than one-third of the distance between conductor portions are aligned between the conductor portions along the opposing direction, thereby improving the magnetic permeability. As a result, the laminated coil component improves the inductance.

[0007] The magnetic permeability of metal magnetic particles having a particle diameter greater than half the distance between the conductor portions is higher than that of metal magnetic particles having a particle diameter equal to or smaller than half the distance between the conductor portions. However, when metal magnetic particles having a particle diameter greater than half the distance between the conductor portions are aligned along the opposing direction between the conductor portions, the number of metal magnetic particles between the conductor portions may be reduced. When the number of metal magnetic particles aligned along the opposing direction between the conductor portions is small, the insulation between the conductor portions may be reduced. The number of metal magnetic particles having a particle diameter equal to or smaller than half the distance between the conductor portions aligned between the conductor portions tends to be greater than the number of metal magnetic particles having a particle diameter greater than half the distance between the conductor portions aligned between the conductor portions. Therefore, the insulation between the conductor portions can be improved in the multilayer coil component.

[0008] In one embodiment, the area of ​​the region where the metal magnetic particles having a particle diameter are aligned along the facing direction in the cross section along the facing direction may be greater than 50% of the area of ​​the region between the adjacent conductor parts in the facing direction, which further improves the insulation between the conductor parts.

[0009] In one embodiment, the conductor portion may have a pair of side surfaces facing each other in the facing direction. The surface roughness of the pair of side surfaces may be less than 40% of the average particle diameter of the metal magnetic particles contained in the element body. The Q characteristic of the laminated coil component depends on the resistance component of the coil conductor. In the high frequency range, current (signal) tends to flow near the surface of the coil conductor due to the skin effect. Therefore, an increase in the resistance component on the surface of the conductor portion and near the surface reduces the Q characteristic of the laminated coil component. Hereinafter, the resistance component on the surface of the conductor portion and near the surface is referred to as "surface resistance." In a configuration in which the conductor portion has an uneven surface, the length over which the current flows is substantially longer than in a configuration in which the conductor portion does not have an uneven surface, and therefore the surface resistance is higher. In a configuration in which the surface roughness of the pair of side surfaces facing each other in the facing direction is less than 40% of the average particle diameter of the metal magnetic particles, an increase in surface resistance and a decrease in the Q characteristic in the high frequency range are suppressed compared to a configuration in which the surface roughness of the pair of side surfaces is 40% or more of the average particle diameter of the metal magnetic particles. Therefore, in the multilayer coil component, an increase in surface resistance is suppressed, and a decrease in Q characteristics in the high frequency range is suppressed.

[0010] In one embodiment, the multiple coil conductors may be plated conductors. When the coil conductor is a sintered metal conductor, the coil conductor is formed by sintering a metal component (metal powder) contained in a conductive paste. In this case, metal magnetic particles penetrate the conductive paste before the metal component is sintered, and unevenness due to the shape of the metal magnetic particles is formed on the surface of the conductive paste. The conductor portion of the formed coil conductor is deformed as the metal magnetic particles penetrate into the conductor portion. Therefore, a configuration in which the coil conductor is a sintered metal conductor significantly increases the surface roughness of the conductor portion of the coil conductor. In contrast, when the coil conductor is a plated conductor, the metal magnetic particles are less likely to penetrate into the coil conductor, and deformation of the coil conductor is suppressed. Therefore, a configuration in which the coil conductor is a plated conductor suppresses an increase in the surface roughness of the conductor portion of the coil conductor and an increase in surface resistance.

[0011] In one embodiment, the conductor portion of the coil conductor includes a first conductor portion extending linearly along a first direction, a second conductor portion extending linearly along a second direction intersecting the first direction, and a third conductor portion connecting the first conductor portion and the second conductor portion and constituting a corner of the coil conductor, and the distance between adjacent third conductor portions may be greater than the distance between adjacent first conductor portions and the distance between adjacent second conductor portions. In a manufacturing process of a laminated coil component, when sheets on which the coil conductors are formed are stacked and pressed, it is difficult to apply pressure uniformly to the corners of the coil conductor, which tends to make it difficult for metal magnetic particles to enter between the third conductor portions constituting the corners of the coil conductor. This reduces the number of metal magnetic particles between the third conductor portions, which may result in a deterioration in insulation between the third conductor portions. In a laminated coil component, increasing the distance between the third conductor portions can suppress a deterioration in insulation between the third conductor portions. [Effects of the Invention]

[0012] According to one aspect of the present invention, it is possible to improve inductance and insulation between conductor portions. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view showing a laminated coil component according to one embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the laminated coil component according to this embodiment. [Figure 3] FIG. 3 is a schematic diagram showing a cross-sectional configuration of the laminated coil component according to this embodiment. [Figure 4] FIG. 4 is a plan view of the coil conductor. [Figure 5] FIG. 5 is a diagram showing the cross-sectional configuration of the conductor portion and the metal magnetic particle. [Figure 6] FIG. 6 is a schematic diagram showing a conductor portion and a metal magnetic particle. [Figure 7] FIG. 7 is a diagram showing the cross-sectional configuration of the conductor portion and the metal magnetic particle. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and redundant description will be omitted.

[0015] The configuration of a laminated coil component 1 according to this embodiment will be described with reference to Fig. 1 to Fig. 3. Fig. 1 is a perspective view showing the laminated coil component according to this embodiment. Fig. 2 is an exploded perspective view of the laminated coil component according to this embodiment. Fig. 3 is a schematic view showing the cross-sectional configuration of the laminated coil component according to this embodiment.

[0016] 1 to 3, the laminated coil component 1 includes an element body 2 and a pair of external electrodes 4 and 5. The pair of external electrodes 4 and 5 are disposed on both ends of the element body 2. The laminated coil component 1 can be used, for example, as a bead inductor or a power inductor.

[0017] The element body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and ridges, and a rectangular parallelepiped shape with rounded corners and ridges. The element body 2 has a pair of opposing end faces 2a, 2b and four side faces 2c, 2d, 2e, and 2f. The four side faces 2c, 2d, 2e, and 2f extend in the direction in which the end faces 2a and 2b face each other, connecting the pair of end faces 2a and 2b.

[0018] The end face 2a and the end face 2b face each other in the first direction D1. The side face 2c and the side face 2d face each other in the second direction D2. The side face 2e and the side face 2f face each other in the third direction D3. The first direction D1, the second direction D2, and the third direction D3 are substantially perpendicular to each other. For example, when the laminated coil component 1 is mounted in an electronic device (not shown), the side face 2d faces an electronic device. The electronic device includes, for example, a circuit board or an electronic component. In this embodiment, the side face 2d is arranged to form a mounting surface. The side face 2d is the mounting surface.

[0019] The element body 2 is configured by stacking multiple magnetic layers 7. The magnetic layers 7 are stacked in the third direction D3. The element body 2 has multiple stacked magnetic layers 7. In an actual element body 2, the multiple magnetic layers 7 are integrated to the extent that the boundaries between the layers are not visible.

[0020] Each magnetic layer 7 contains a plurality of metal magnetic particles. The metal magnetic particles are made of, for example, a soft magnetic alloy. The soft magnetic alloy is, for example, an Fe-Si alloy. When the soft magnetic alloy is an Fe-Si alloy, it may contain P. The soft magnetic alloy may be, for example, an Fe-Ni-Si-M alloy. "M" includes one or more elements selected from Co, Cr, Mn, P, Ti, Zr, Hf, Nb, Ta, Mo, Mg, Ca, Sr, Ba, Zn, B, Al, and rare earth elements.

[0021] In the magnetic layer 7, the metal magnetic particles are bonded to each other. The bond between the metal magnetic particles is realized, for example, by bonding between oxide films formed on the surfaces of the metal magnetic particles. In the magnetic layer 7, the metal magnetic particles are electrically insulated from each other by the bonding between the oxide films. The thickness of the oxide film is, for example, 5 to 60 nm or less. The oxide film may be composed of one or more layers.

[0022] The element body 2 contains a resin. The resin is present among the plurality of metal magnetic particles. The resin is a resin having electrical insulating properties (insulating resin). The insulating resin includes, for example, a silicone resin, a phenol resin, an acrylic resin, or an epoxy resin.

[0023] The metal magnetic particles have an average particle size of 0.5 to 15 μm. In this embodiment, the metal magnetic particles have an average particle size of 5 μm. In this embodiment, the "average particle size" refers to the particle size at an integrated value of 50% in the particle size distribution determined by laser diffraction / scattering.

[0024] The external electrode 4 is disposed on the end face 2a of the element body 2, and the external electrode 5 is disposed on the end face 2b of the element body 2. That is, the external electrodes 4 and 5 are spaced apart from each other in the first direction D1. The external electrodes 4 and 5 have a substantially rectangular shape in a plan view, and the corners of the external electrodes 4 and 5 are rounded. The external electrodes 4 and 5 contain a conductive material. The conductive material is, for example, Ag or Pd. The external electrodes 4 and 5 are configured as a sintered body of a conductive paste. The conductive paste contains a conductive metal powder and glass frit. The conductive metal powder is, for example, Ag powder or Pd powder. A plating layer is formed on the surface of the external electrodes 4 and 5. The plating layer is formed by, for example, electroplating. The electroplating is, for example, Ni electroplating or Sn electroplating.

[0025] The external electrode 4 includes five electrode portions: electrode portion 4a located on the end face 2a, electrode portion 4b located on the side face 2d, electrode portion 4c located on the side face 2c, electrode portion 4d located on the side face 2e, and electrode portion 4e located on the side face 2f. Electrode portion 4a covers the entire end face 2a. Electrode portion 4b covers a portion of the side face 2d. Electrode portion 4c covers a portion of the side face 2c. Electrode portion 4d covers a portion of the side face 2e. Electrode portion 4e covers a portion of the side face 2f. The five electrode portions 4a, 4b, 4c, 4d, and 4e are integrally formed.

[0026] The external electrode 5 includes five electrode portions: electrode portion 5a located on the end face 2b, electrode portion 5b located on the side face 2d, electrode portion 5c located on the side face 2c, electrode portion 5d located on the side face 2e, and electrode portion 5e located on the side face 2f. Electrode portion 5a covers the entire end face 2b. Electrode portion 5b covers a portion of the side face 2d. Electrode portion 5c covers a portion of the side face 2c. Electrode portion 5d covers a portion of the side face 2e. Electrode portion 5e covers a portion of the side face 2f. The five electrode portions 5a, 5b, 5c, 5d, and 5e are integrally formed.

[0027] The laminated coil component 1 includes a coil 20 and a pair of connecting conductors 13 and 14. The coil 20 is disposed within the element body 2. The coil 20 includes a plurality of coil conductors C. In this embodiment, the plurality of coil conductors C includes nine coil conductors 21 to 29. The coil 20 includes a through-hole conductor 30. The pair of connecting conductors 13 and 14 is also disposed within the element body 2.

[0028] The coil conductors C (coil conductors 21 to 29) are arranged within the element body 2. The coil conductors 21 to 29 are spaced apart from one another in the third direction D3. The distances Dc between the coil conductors 21 to 29 adjacent to one another in the third direction D3 are all equal. The distances Dc may be different. The coil axes Ax (see FIG. 4) of the coils 20 adjacent to one another in the third direction D3 extend along the third direction D3. The thickness of the coil conductors 21 to 29 is, for example, approximately 5 to 300 μm.

[0029] The distance Dc is, for example, 5 to 30 μm. In this embodiment, the distance Dc is 15 μm. As will be described later, the surfaces of the coil conductors C (coil conductors 21 to 29) have roughness, and therefore the distance Dc varies depending on the surface shape of the coil conductors C. Therefore, the distance Dc can be obtained, for example, as follows.

[0030] A cross-sectional photograph of the laminated coil component 1 including each coil conductor C (each coil conductor 21 to 29) is obtained. The cross-sectional photograph is obtained, for example, by photographing a cross section of the laminated coil component 1 cut along a plane that is parallel to the pair of end faces 2a, 2b and is a predetermined distance away from one of the end faces 2a. The plane may be equidistant from the pair of end faces 2a, 2b. The cross-sectional photograph may also be obtained by photographing a cross section of the laminated coil component 1 cut along a plane that is parallel to the pair of side faces 2e, 2f and is a predetermined distance away from one of the side faces 2e. On the obtained cross-sectional photograph, the distances between the coil conductors C adjacent to each other in the third direction D3 are measured at any multiple positions. The number of measurement positions is, for example, 50. The average of the measured distances is calculated. The calculated average is defined as the distance Dc.

[0031] Fig. 4 is a plan view of the coil conductor. Fig. 4 shows coil conductor 22. As shown in Figs. 2 and 4, some of the multiple coil conductors C (coil conductors 21 to 28) have a spiral shape when viewed from the third direction D3 (the direction along the coil axis Ax). The coil conductor C has a first conductor portion SC1 and a second conductor portion SC2 that extend linearly, and a third conductor portion SC3 that connects an end of the first conductor portion SC1 and an end of the second conductor portion SC2.

[0032] The first conductor portion SC1 extends along the first direction D1. The first conductor portions SC1 face each other in the second direction D2. The second conductor portion SC2 extends along the second direction D2. The second conductor portions SC2 face each other in the first direction D1. The third conductor portion SC3 forms a corner of the coil conductor C. The third conductor portion SC3 has a curved shape. The third conductor portion SC3 has a predetermined radius of curvature. The third conductor portion SC3 faces each other in a direction intersecting the first direction D1 and the second direction D2. The widths of the first conductor portion SC1, the second conductor portion SC2 and the third conductor portion SC3 are, for example, approximately 5 to 300 μm.

[0033] The first distance (distance between the conductor portions) Dc1 between adjacent first conductor portions SC1 and SC1 and the second distance (distance between the conductor portions) Dc2 between adjacent second conductor portions SC2 and SC2 are equivalent (Dc1 ≈ Dc2). The first distance Dc1 and the second distance Dc2 may be different. The third distance (distance between the conductor portions) Dc3 between adjacent third conductor portions SC3 and SC3 is greater than the first distance Dc1 and the second distance Dc2 (Dc3 > Dc1, Dc2). The first distance Dc1 between adjacent first conductor portions SC1 and SC1 is the distance between a pair of first conductor portions SC1 adjacent in the first direction D1 when viewed from the third direction D3. It is not the distance (distance Dc) between adjacent first conductor portions SC1 in the third direction D3. The same applies to the second distance Dc2 and the third distance Dc3.

[0034] The first distance Dc1 and the second distance Dc2 are, for example, 5 to 30 μm. In this embodiment, the first distance Dc1 and the second distance Dc2 are 10 μm. The third distance Dc3 is, for example, 8 to 50 μm. In this embodiment, the third distance Dc3 is 15 μm. Since the surface of the coil conductor C (coil conductors 21 to 26) has roughness, as will be described later, the first distance Dc1, the second distance Dc2, and the third distance Dc3 vary depending on the surface shape of the coil conductor C. Therefore, the first distance Dc1, the second distance Dc2, and the third distance Dc3 can be obtained, for example, as follows.

[0035] A cross-sectional photograph of the laminated coil component 1 including the coil conductor C (coil conductors 21 to 28) is obtained. The cross-sectional photograph is obtained, for example, by photographing a cross section of the laminated coil component 1 including one of the coil conductors C, cut along a plane parallel to the side surfaces 2c and 2d and spaced a predetermined distance from the side surface 2c or 2d. On the obtained cross-sectional photograph, the distances between the first conductor portion SC1, the second conductor portion SC2, and the third conductor portion SC3, which are adjacent to each other, are measured at a plurality of arbitrary positions. The number of measurement positions is, for example, 50. The average values ​​of the measured distances are calculated. The calculated average values ​​are designated as the first distance Dc1, the second distance Dc2, and the third distance Dc3.

[0036] The through-hole conductor 30 is located between the ends of the coil conductors 21 to 29 that are adjacent to each other in the third direction D3. The through-hole conductor 30 connects the ends of the coil conductors 21 to 29 that are adjacent to each other in the third direction D3. The multiple coil conductors 21 to 29 are electrically connected to each other through the through-hole conductors 30. The end of the coil conductor 21 forms one end of the coil 20. The end of the coil conductor 29 forms the other end of the coil 20. The direction of the axial center of the coil 20 is along the third direction D3.

[0037] The connecting conductor 13 is connected to the coil conductor 21. The connecting conductor 13 is continuous with the coil conductor 21. The connecting conductor 13 is formed integrally with the coil conductor 21. The connecting conductor 13 connects the end 21a of the coil conductor 21 to the external electrode 4, and is exposed at the end surface 2a of the element body 2. The connecting conductor 13 is connected to the electrode portion 4a of the external electrode 4. The connecting conductor 13 electrically connects one end of the coil 20 to the external electrode 4.

[0038] The connecting conductor 14 is connected to the coil conductor 29. The connecting conductor 14 is continuous with the coil conductor 29. The connecting conductor 14 is formed integrally with the coil conductor 29. The connecting conductor 14 connects the end 29b of the coil conductor 29 to the external electrode 5, and is exposed at the end surface 2b of the element body 2. The connecting conductor 14 is connected to the electrode portion 5a of the external electrode 5. The connecting conductor 14 electrically connects the other end of the coil 20 to the external electrode 5.

[0039] The coil conductor C (coil conductors 21 to 29) and the connecting conductors 13 and 14 are plated conductors. The coil conductor C and the connecting conductors 13 and 14 contain a conductive material. The conductive material is, for example, Ag, Pd, Cu, Al, or Ni. The through-hole conductor 30 contains a conductive material. The conductive material is, for example, Ag, Pd, Cu, Al, or Ni. The through-hole conductor 30 is formed as a sintered body of a conductive paste. The conductive paste contains a conductive metal powder. The conductive metal powder is, for example, Ag powder, Pd powder, Cu powder, Al powder, or Ni powder. The through-hole conductor 30 may be a plated conductor.

[0040] The plurality of metal magnetic particles contained in the element body 2 include a plurality of metal magnetic particles MM having a particle diameter that is 1 / 3 to 1 / 2 of the first distance Dc1, the second distance Dc2, and the third distance Dc3. In this embodiment, the particle diameter of the metal magnetic particles MM is 5.0 to 7.5 μm.

[0041] Fig. 5 is a diagram showing the cross-sectional configuration of the conductor portion and the metal magnetic particles. Fig. 5 shows the first conductor portion SC1. As shown in Fig. 5, the metal magnetic particles MM are aligned along the second direction D2 between adjacent first conductor portions SC1 in the second direction D2. That is, the metal magnetic particles MM are aligned along the opposing direction of the first conductor portions SC1 between adjacent first conductor portions SC1. Similarly, the metal magnetic particles MM are aligned along the opposing direction of the second conductor portions SC2 (first direction D1) between adjacent second conductor portions SC2. The metal magnetic particles MM are aligned along the opposing direction of the third conductor portions SC3 between adjacent third conductor portions SC3.

[0042] FIG. 6 is a schematic diagram showing conductor portions and metal magnetic particles. In FIG. 6, the first conductor portion SC1 is shown, and hatching representing cross sections is omitted. The alignment of the metal magnetic particles MM along the second direction D2 includes not only a state in which the metal magnetic particles MM are entirely overlapping each other when viewed from the second direction D2, but also a state in which the metal magnetic particles MM are partially overlapping each other when viewed from the second direction D2. The same applies to the second conductor portion SC2 and the third conductor portion SC3. The plurality of metal magnetic particles contained in the element body 2 include metal magnetic particles having a particle diameter larger than that of the metal magnetic particles MM and metal magnetic particles having a particle diameter smaller than that of the metal magnetic particles MM. In this embodiment, the particle diameter is defined as a circle-equivalent diameter.

[0043] The equivalent circle diameter of the metal magnetic particles can be obtained, for example, as follows.

[0044] A cross-sectional photograph of the laminated coil component 1 including the coil conductor C (coil conductors 21 to 29) and the metal magnetic particles is obtained. As described above, the cross-sectional photograph is obtained, for example, by photographing a cross section of the laminated coil component 1 including one coil conductor C, cut along a plane parallel to the side surfaces 2c and 2d and spaced a predetermined distance from the side surface 2c or 2d. The cross-sectional photograph may be a cross-sectional photograph taken when obtaining the first distance Dc1, the second distance Dc2, and the third distance Dc3. The obtained cross-sectional photograph is subjected to image processing using software. This image processing distinguishes the boundaries of each metal magnetic particle, and the area of ​​each metal magnetic particle is calculated. From the calculated areas of the metal magnetic particles, the particle diameters converted into circle-equivalent diameters are calculated.

[0045] The region between adjacent first conductor portions SC1 in the second direction D2 includes a region where the metal magnetic particles MM are aligned along the second direction D2. The region between adjacent first conductor portions SC1 in the second direction D2 is a region sandwiched between adjacent first conductor portions SC1 that are close to each other in the second direction D2. For example, the region between the first conductor portions SC1 is a region between the first conductor portions SC1 that are arranged opposite each other with the first distance Dc1 in FIG. 4, but is not a region between the first conductor portions SC1 that are arranged opposite each other with the coil axis Ax sandwiched therebetween. Furthermore, the region between the first conductor portions SC1 is not a region between the first conductor portions SC1 that are arranged opposite each other in the third direction D3. The same applies to the region between adjacent second conductor portions SC2 and the region between adjacent third conductor portions SC3.

[0046] In a cross section taken along the first direction D1 and the second direction D2, the area of ​​the region where the metal magnetic particles MM are aligned along the second direction D2 is greater than 50% of the area of ​​the region between adjacent first conductor portions SC1 in the second direction D2. In the region where the metal magnetic particles MM are aligned along the second direction D2, the metal magnetic particles MM may be in contact with one another, or may not be in contact with one another. In the region between adjacent first conductor portions SC1 in the second direction D2, metal magnetic particles having a particle diameter larger than that of the metal magnetic particles MM and metal magnetic particles having a particle diameter smaller than that of the metal magnetic particles MM are also located.

[0047] The area of ​​the region where the metal magnetic particles MM are aligned along the second direction D2 (opposing direction) can be obtained, for example, as follows.

[0048] A cross-sectional photograph of the laminated coil component 1 including the coil conductors C (coil conductors 21 to 29) and the metal magnetic particles is obtained. As described above, the cross-sectional photograph is obtained, for example, by photographing a cross section of the laminated coil component 1, including one of the coil conductors C, cut along a plane parallel to the side surfaces 2c and 2d and spaced a predetermined distance from the side surface 2c or 2d. The cross-sectional photograph may be a cross-sectional photograph taken when obtaining the first distance Dc1, the second distance Dc2, and the third distance Dc3, or a cross-sectional photograph taken when obtaining the circle-equivalent diameter of the metal magnetic particles. The obtained cross-sectional photograph is subjected to image processing using software. This image processing distinguishes the boundaries of the metal magnetic particles located in the regions between the first conductor portions SC1 adjacent to each other in the second direction D2, and calculates the area of ​​each metal magnetic particle. From the calculated areas of the metal magnetic particles, the particle diameters converted into circle-equivalent diameters are calculated. Among the metal magnetic particles located in the region between adjacent first conductor portions SC1 in the second direction D2, metal magnetic particles MM having a particle diameter that is greater than or equal to 1 / 3 and less than or equal to 1 / 2 of the first distance Dc1, the second distance Dc2, and the third distance Dc3 are identified.

[0049] As shown in FIG. 6, a pair of straight lines Lr, which are tangent to the multiple metal magnetic particles MM aligned along the second direction D2 and parallel to the second direction D2, are defined on the cross-sectional photograph. The area of ​​the region enclosed by the pair of straight lines Lr and a pair of first conductors SC1 facing each other in the second direction D2 is calculated. If there are multiple regions enclosed by a pair of straight lines Lr and a pair of first conductors SC1, the sum of the areas of the regions is taken as the area of ​​the region where the metal magnetic particles MM are aligned along the second direction D2. FIG. 6 is a schematic diagram showing conductors and metal magnetic particles. In FIG. 6, for ease of explanation and understanding, the side of the first conductor SC1 is shown as a straight line, and the metal magnetic particles MM are shown as perfect circles. Naturally, the actual shapes of the first conductors SC1 and the metal magnetic particles MM are not limited to the shapes shown in FIG. 6. As described above, the region between the first conductors SC1 contains metal magnetic particles MM with a particle diameter larger than that of the metal magnetic particles MM. L and metal magnetic particles MM having a particle diameter smaller than that of the metal magnetic particles MM. S is also located.

[0050] The area of ​​the region between the first conductor portions SC1 adjacent to each other in the second direction D2 can be obtained, for example, as follows.

[0051] The cross-sectional photograph taken when obtaining the area of ​​the region where the metal magnetic particles MM are aligned along the second direction D2 is subjected to image processing using software. This image processing distinguishes the boundaries between the first conductors SC1, and calculates the area of ​​the region sandwiched between a pair of first conductors SC1 facing each other in the second direction D2. The area between the second conductors SC2 and the area between the third conductors SC3 can also be obtained in the same manner as above.

[0052] As shown in FIG. 3, each coil conductor C (each coil conductor 21 to 29) has a pair of side surfaces SF1. The pair of side surfaces SF1 face each other in the third direction D3. As shown in FIGS. 3 and 5, each coil conductor C has a pair of side surfaces SF2 in addition to the pair of side surfaces SF1. The pair of side surfaces SF2 extend so as to connect the pair of side surfaces SF1. The cross-sectional shape of each coil conductor C (first conductor portion SC1, second conductor portion SC2, third conductor portion SC3) is substantially quadrangular. The cross-sectional shape of each coil conductor C is, for example, substantially rectangular or substantially trapezoidal.

[0053] The surface roughness of each side surface SF1 and each side surface SF2 is less than 40% of the average particle diameter of the metal magnetic particles. In this embodiment, the surface roughness of each side surface SF1 and each side surface SF2 is less than 2 μm. The surface roughness of each side surface SF1 and each side surface SF2 is, for example, 1.0 to 1.8 μm. In this case, the surface roughness of each side surface SF1 and each side surface SF2 is 20 to 36% of the average particle diameter of the metal magnetic particles. The surface roughness of each side surface SF1 and each side surface SF2 may be approximately 0 μm. The surface roughness of each side surface SF1 and each side surface SF2 may be the same or different. As also shown in FIG. 5, resin RE is present between the metal magnetic particles. As described above, the resin RE includes, for example, silicone resin, phenol resin, acrylic resin, or epoxy resin.

[0054] The surface roughness of each side surface SF1 of the coil conductor C is obtained, for example, as follows.

[0055] A cross-sectional photograph of the laminated coil component 1 including each coil conductor C (each coil conductor 21 to 29) is obtained. As described above, the cross-sectional photograph is obtained, for example, by photographing a cross section of the laminated coil component 1 cut along a plane that is parallel to the pair of end faces 2a, 2b and is spaced a predetermined distance from one of the end faces 2a. In this case, the plane may be positioned equidistant from the pair of end faces 2a, 2b. As described above, the cross-sectional photograph may be obtained by photographing a cross section of the laminated coil component 1 cut along a plane that is parallel to the pair of side faces 2e, 2f and is spaced a predetermined distance from one of the side faces 2e. The cross-sectional photograph may be a cross-sectional photograph taken when obtaining the distance Dc or a cross-sectional photograph taken when obtaining the circle-equivalent diameter of the metal magnetic particles.

[0056] The curve corresponding to the side surface SF1 on the acquired cross-sectional photograph is represented by a roughness curve. A reference length is extracted from the side surface SF1 (roughness curve) on the cross-sectional photograph, and a peak line at the highest peak in the extracted portion is obtained. The reference length is, for example, 100 μm. The peak line is perpendicular to the third direction D3 and serves as a reference line. The extracted portion is divided into a predetermined number of equal sections. The predetermined number is, for example, 10. A valley line at the lowest bottom is obtained for each equally divided section. The valley line is also perpendicular to the third direction D3. For each equally divided section, the distance between the peak line and the valley line in the third direction D3 is measured. The average of the measured distances is calculated. The calculated average is defined as the surface roughness. The surface roughness is obtained for each side surface SF1 using the procedure described above. Multiple cross-sectional photographs may be acquired at different positions, and the surface roughness may be obtained for each cross-sectional photograph. In this case, the average of the multiple acquired surface roughness values ​​may be defined as the surface roughness.

[0057] The surface roughness of each side surface SF2 of the coil conductor C is obtained, for example, as follows.

[0058] A cross-sectional photograph of the laminated coil component 1 including the coil conductor C (coil conductors 21 to 29) is obtained. As described above, the cross-sectional photograph can be obtained, for example, by photographing a cross section of the laminated coil component 1 including one of the coil conductors C, cut along a plane that is parallel to the side surfaces 2c and 2d and is a predetermined distance away from the side surface 2c or 2d. The cross-sectional photograph may be a cross-sectional photograph taken when obtaining the first distance Dc1, the second distance Dc2, and the third distance Dc3, a cross-sectional photograph taken when obtaining the circle-equivalent diameter of the metal magnetic particles, or a cross-sectional photograph taken when obtaining the area of ​​a region where the metal magnetic particles MM are aligned along the second direction D2.

[0059] The curve corresponding to the side surface SF2 on the acquired cross-sectional photograph is represented by a roughness curve. A reference length is extracted from the side surface SF2 (roughness curve) on the cross-sectional photograph, and a peak line at the highest peak in the extracted portion is obtained. The reference length is, for example, 100 μm. The peak line is perpendicular to the first direction D1 or the second direction D2 and serves as a reference line. The extracted portion is divided into a predetermined number of equal sections. The predetermined number is, for example, 10. A valley line at the lowest bottom is obtained for each equally divided section. The valley line is also perpendicular to the first direction D1 or the second direction D2. For each equally divided section, the distance between the peak line and the valley line in the first direction D1 or the second direction D2 is measured. The average of the measured distances is calculated. The calculated average is defined as the surface roughness. The surface roughness is obtained for each side surface SF2 using the procedure described above. Multiple cross-sectional photographs may be acquired at different positions, and the surface roughness may be obtained for each cross-sectional photograph. In this case, the average of the multiple acquired surface roughness values ​​may be defined as the surface roughness.

[0060] Fig. 7 is a diagram showing the cross-sectional configuration of the conductor portions and the metal magnetic particles. Fig. 7 shows the first conductor portion SC1. As shown in Fig. 7, in the laminated coil component 1, the plurality of metal magnetic particles contained in the element body 2 include a plurality of metal magnetic particles MM having a particle diameter that is between 1 / 3 and 1 / 2 of the distance Dc between the coil conductors C. The metal magnetic particles MM are aligned along the third direction D3 between the coil conductors C (the first conductor portion SC1, the second conductor portion SC2, and the third conductor portion SC3) that are adjacent to each other in the third direction D3.

[0061] "Metal magnetic particles MM aligned along the third direction D3" refers not only to a state in which the metal magnetic particles MM are entirely overlapping one another when viewed from the third direction D3, but also to a state in which the metal magnetic particles MM are partially overlapping one another when viewed from the third direction D3. The plurality of metal magnetic particles contained in the element body 2 include metal magnetic particles having a particle diameter larger than that of the metal magnetic particles MM and metal magnetic particles having a particle diameter smaller than that of the metal magnetic particles MM. In this embodiment, the particle diameter is defined as a circle-equivalent diameter. The circle-equivalent diameter of the metal magnetic particles can be calculated using a method similar to that described above.

[0062] The region between adjacent coil conductors C in the third direction D3 includes a region where metal magnetic particles MM are aligned along the third direction D3. The region between adjacent coil conductors C in the third direction D3 is a region in the element body 2 sandwiched between the adjacent coil conductors C in the third direction D3. For example, the region between coil conductors 21 and 22 is a region in the element body 2 sandwiched between the coil conductors 21 and 22, and overlaps the entire coil conductors 21 and 22 when viewed from the third direction D3. In a cross section taken along the third direction D3, the area of ​​the region where the metal magnetic particles MM are aligned along the third direction D3 is greater than 50% of the area of ​​the region between adjacent coil conductors C in the third direction D3. In the region where the metal magnetic particles MM are aligned along the third direction D3, the metal magnetic particles MM may or may not be in contact with each other. In the region between adjacent coil conductors C in the third direction D3, metal magnetic particles having a particle diameter larger than the particle diameter of the metal magnetic particles MM and metal magnetic particles having a particle diameter smaller than the particle diameter of the metal magnetic particles MM are also located.

[0063] The area of ​​the region where the metal magnetic particles MM are aligned along the third direction D3 can be obtained, for example, as follows. A cross-sectional photograph of the laminated coil component 1 including each coil conductor C (each coil conductor 21 to 29) and the metal magnetic particles is obtained. As described above, the cross-sectional photograph is obtained, for example, by photographing a cross section of the laminated coil component 1 cut along a plane that is parallel to the pair of end faces 2a, 2b and a predetermined distance away from one of the end faces 2a. In this case, the plane may be positioned equidistant from the pair of end faces 2a, 2b. As described above, the cross-sectional photograph may also be obtained by photographing a cross section of the laminated coil component 1 cut along a plane that is parallel to the pair of side faces 2e, 2f and a predetermined distance away from one of the side faces 2e. The cross-sectional photograph may be a cross-sectional photograph taken when obtaining the distance Dc or a cross-sectional photograph taken when obtaining the circle-equivalent diameter of the metal magnetic particles.

[0064] The acquired cross-sectional photograph is subjected to image processing using software. This image processing distinguishes the boundaries of each metal magnetic particle located in the region between adjacent coil conductors C in the third direction D3, and calculates the area of ​​each metal magnetic particle. From the calculated area of ​​the metal magnetic particle, the particle diameter converted into a circle-equivalent diameter is calculated. Of the metal magnetic particles located in the region between adjacent coil conductors C in the third direction D3, metal magnetic particles MM having a particle diameter of 1 / 3 to 1 / 2 of the distance Dc are identified.

[0065] A pair of straight lines tangent to the multiple metal magnetic particles MM aligned along the third direction D3 and parallel to the third direction D3 are defined on the cross-sectional photograph. The area of ​​the region enclosed by the pair of straight lines and a pair of coil conductors C facing each other in the third direction D3 is calculated. If there are multiple regions enclosed by a pair of straight lines and a pair of coil conductors C, the sum of the areas of the regions is taken as the area of ​​the region where the metal magnetic particles MM are aligned along the third direction D3. As described above, the region between the coil conductors C contains metal magnetic particles MM with a particle diameter larger than that of the metal magnetic particles MM. L and metal magnetic particles MM having a particle diameter smaller than that of the metal magnetic particles MM. Sis also located.

[0066] The area of ​​the region between adjacent coil conductors C in the third direction D3 can be obtained, for example, as follows: A cross-sectional photograph taken when obtaining the area of ​​the region where the metal magnetic particles MM are aligned along the third direction D3 is subjected to image processing using software. This image processing distinguishes the boundary between the coil conductors C, and the area of ​​the region sandwiched between the pair of coil conductors C facing each other in the third direction D3 is calculated.

[0067] Next, a method for manufacturing the laminated coil component 1 will be described.

[0068] A slurry is prepared by mixing metal magnetic particles, an insulating resin, a solvent, etc. The prepared slurry is applied to a substrate (such as a PET film) by a doctor blade method to form a green sheet that will become the magnetic layer 7. Next, through holes are formed by laser processing in the green sheet at the positions where through-hole conductors 30 (see FIG. 2) are to be formed.

[0069] Next, a first conductive paste is filled into the through holes of the green sheet. The first conductive paste is made by mixing conductive metal powder, binder resin, etc. Next, plated conductors that will become each coil conductor C and connecting conductors 13, 14 are provided on the green sheet. At this time, the plated conductors are connected to the conductive paste in the through holes.

[0070] Next, the green sheets are stacked. Here, multiple green sheets with plated conductors are peeled from the substrate, stacked, and pressed in the stacking direction to form a laminate. At this time, the green sheets are stacked so that the plated conductors that will become the coil conductors C and the connecting conductors 13 and 14 overlap in the stacking direction.

[0071] Next, the laminate of green sheets is cut into chips of a predetermined size using a cutting machine to obtain green chips. Next, the binder resin contained in each part is removed from the green chip, and then the green chip is fired. This results in an element body 2.

[0072] Next, a second conductive paste is applied to each of the pair of end faces 2a, 2b of the element body 2. The second conductive paste is made by mixing conductive metal powder, glass frit, binder resin, etc. Next, the second conductive paste is baked onto the element body 2 by heat treatment, forming a pair of external electrodes 4, 5. The surfaces of the pair of external electrodes 4, 5 are electroplated to form a plating layer. Through the above steps, the multilayer coil component 1 is obtained.

[0073] As described above, in the laminated coil component 1 according to this embodiment, the magnetic permeability of the metal magnetic particles MM having a particle diameter equal to or greater than one-third of the first distance Dc1, the second distance Dc2, and the third distance Dc3 is higher than that of the metal magnetic particles having a particle diameter smaller than one-third of the first distance Dc1, the second distance Dc2, and the third distance Dc3. In the laminated coil component 1, the metal magnetic particles MM having a particle diameter equal to or greater than one-third of the first distance Dc1, the second distance Dc2, and the third distance Dc3 are aligned between the first conductor portion SC1, the second conductor portion SC2, and the third conductor portion SC3 (hereinafter referred to as "conductor portions") along the opposing direction of the conductor portions, thereby improving the magnetic permeability. As a result, the laminated coil component 1 improves the inductance.

[0074] The magnetic permeability of metal magnetic particles having particle diameters greater than half the first distance Dc1, the second distance Dc2, and the third distance Dc3 is higher than that of metal magnetic particles MM having particle diameters equal to or less than half the first distance Dc1, the second distance Dc2, and the third distance Dc3. However, when metal magnetic particles having particle diameters greater than half the first distance Dc1, the second distance Dc2, and the third distance Dc3 are arranged between the conductor portions along the opposing direction of the conductor portions, the number of metal magnetic particles between the conductor portions may be reduced. When the number of metal magnetic particles arranged between the conductor portions along the opposing direction of the conductor portions is small, the insulation between the conductor portions may be reduced. The number of metal magnetic particles MM having particle diameters equal to or less than half the first distance Dc1, the second distance Dc2, and the third distance Dc3 arranged between the conductor portions tends to be greater than the number of metal magnetic particles having particle diameters greater than half the first distance Dc1, the second distance Dc2, and the third distance Dc3 arranged between the conductor portions. Therefore, in the laminated coil component 1, the insulation between the conductor portions can be improved.

[0075] The number of metal magnetic particles having a particle diameter smaller than 1 / 3 of the first distance Dc1, the second distance Dc2, and the third distance Dc3 arranged between the conductor portions tends to be greater than the number of metal magnetic particles MM having a particle diameter equal to or greater than 1 / 3 of the first distance Dc1, the second distance Dc2, and the third distance Dc3 arranged between the conductor portions. However, when metal magnetic particles having a particle diameter smaller than 1 / 3 of the first distance Dc1, the second distance Dc2, and the third distance Dc3 are arranged between the conductor portions, the gaps formed between the metal magnetic particles (metal magnetic particles MM) are smaller than when metal magnetic particles MM having a particle diameter equal to or greater than 1 / 3 of the first distance Dc1, the second distance Dc2, and the third distance Dc3 are arranged between the conductor portions. Therefore, it is difficult for the resin RE to exist between the metal magnetic particles, which may reduce the insulation between the conductor portions. In the laminated coil component 1, a plurality of metal magnetic particles MM having particle diameters equal to or greater than one-third of the first distance Dc1, the second distance Dc2, and the third distance Dc3 are aligned between the conductor portions along the opposing direction of the conductor portions, so that the resin RE is likely to be present between the metal magnetic particles MM, and the insulation between the conductor portions is unlikely to deteriorate. As a result, the laminated coil component 1 can improve the insulation between the conductor portions.

[0076] In the laminated coil component 1 according to this embodiment, in a cross section taken along the opposing direction of the conductor portions, the area of ​​the region where the metal magnetic particles having a particle diameter are aligned along the opposing direction is greater than 50% of the area of ​​the region between the conductor portions adjacent to each other in the opposing direction. This configuration further improves the insulation between the conductor portions.

[0077] The Q characteristic of the multilayer coil component 1 depends on the resistance component of the coil conductor C (coil conductors 21 to 29). In the high-frequency range, current (signal) tends to flow near the surface of the coil conductor C due to the skin effect. Therefore, an increase in the surface resistance of the coil conductor C (conductor portion) reduces the Q characteristic of the multilayer coil component 1. In a configuration in which the surface of the coil conductor C is uneven, the length through which current flows is substantially longer than in a configuration in which the surface of the coil conductor C is not uneven, resulting in a higher surface resistance. In a configuration in which the surface roughness of each side surface SF1 and each side surface SF2 is less than 40% of the average particle diameter of the metal magnetic particles MM, the increase in surface resistance is suppressed, and the deterioration of the Q characteristic in the high-frequency range is suppressed, compared to a configuration in which the surface roughness of each side surface SF1 and each side surface SF2 is 40% or more of the average particle diameter of the metal magnetic particles MM. Therefore, the multilayer coil component 1 suppresses an increase in surface resistance and a deterioration of the Q characteristic in the high-frequency range.

[0078] In the laminated coil component 1 according to this embodiment, the coil conductor C (coil conductors 21 to 29) is a plated conductor. When the coil conductor is a sintered metal conductor, the coil conductor is formed by sintering a metal component (metal powder) contained in a conductive paste. In this case, metal magnetic particles bite into the conductive paste in a process prior to sintering the metal component, and unevenness due to the shape of the metal magnetic particles is formed on the surface of the conductive paste. When the coil conductor is a sintered metal conductor, the coil conductor is deformed such that the metal magnetic particles bite into the coil conductor. Therefore, a configuration in which the coil conductor is a sintered metal conductor significantly increases the surface roughness of the coil conductor.

[0079] In contrast, when the coil conductor C is a plated conductor, as shown in Fig. 5, the metal magnetic particles MM are less likely to bite into the coil conductor C (conductor portion), suppressing deformation of the coil conductor C. Therefore, a configuration in which the coil conductor C is a plated conductor suppresses an increase in the surface roughness of the coil conductor C and an increase in surface resistance.

[0080] In the laminated coil component 1 according to this embodiment, the conductor portion of the coil conductor C includes a first conductor portion SC1 extending linearly along the first direction D1, a second conductor portion SC2 extending linearly along a second direction D2 intersecting the first direction D1, and a third conductor portion SC3 connecting the first conductor portion SC1 and the second conductor portion SC2 and constituting a corner of the coil conductor C. The third distance Dc3 between adjacent third conductor portions SC3 is greater than the first distance Dc1 between adjacent first conductor portions SC1 and the second distance Dc2 between adjacent second conductor portions SC2. During the manufacturing process of the laminated coil component 1, when green sheets on which the coil conductor C is formed are stacked and pressed, it is difficult to apply pressure uniformly to the corners of the coil conductor C. This makes it difficult for metal magnetic particles to enter between the third conductor portions SC3 constituting the corners of the coil conductor C. This reduces the number of metal magnetic particles between the third conductor portions SC3, which may result in a decrease in insulation between the third conductor portions SC3. In the laminated coil component 1, by increasing the distance between the third conductor portions SC3, it is possible to suppress a decrease in the insulation between the third conductor portions SC3.

[0081] In the laminated coil component 1 according to this embodiment, the magnetic permeability of the metal magnetic particles MM having a particle diameter equal to or greater than 1 / 3 of the distance Dc is higher than that of metal magnetic particles having a particle diameter smaller than 1 / 3 of the distance Dc. In the laminated coil component 1, the metal magnetic particles MM having a particle diameter equal to or greater than 1 / 3 of the distance Dc are aligned along the third direction D3 between the coil conductors C (coil conductors 21 to 26), thereby improving the magnetic permeability. As a result, the laminated coil component 1 has improved inductance.

[0082] The magnetic permeability of metal magnetic particles having a particle diameter greater than half the distance Dc is higher than that of metal magnetic particles MM having a particle diameter equal to or less than half the distance Dc. However, if metal magnetic particles having a particle diameter greater than half the distance Dc are aligned along the third direction D3 between the coil conductors C, stacking misalignment of the coil conductors C is likely to occur during the manufacturing process of the laminated coil component 1. If stacking misalignment occurs in the coil conductors C, the cross-sectional area of ​​the magnetic path located inside the coil 20 may decrease, resulting in a decrease in inductance. In the laminated coil component 1, multiple metal magnetic particles MM having a particle diameter equal to or less than half the distance Dc are aligned along the third direction D3 between the coil conductors C, so stacking misalignment of the coil conductors C is unlikely to occur. As a result, the laminated coil component 1 suppresses a decrease in inductance.

[0083] Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0084] In a cross section taken along the first direction D1 and the second direction D2, the area of ​​the region where the metal magnetic particles MM are aligned along the opposing direction of the conductor portions may be 50% or less of the area of ​​the region between adjacent conductor portions. A configuration in which the area of ​​the region where the metal magnetic particles MM are aligned along the opposing direction of the conductor portions in a cross section taken along the first direction D1 and the second direction D2 is greater than 50% of the area of ​​the region between adjacent conductor portions further suppresses the deterioration of insulation between the conductor portions, as described above.

[0085] The number of coil conductors C (coil conductors 21 to 29) is not limited to the above-mentioned value.

[0086] The coil axis Ax of the coil 20 may extend along the first direction D1. In this case, the magnetic layers 7 are stacked in the first direction D1, and the coil conductors C (coil conductors 21 to 29) are spaced apart from one another in the first direction D1.

[0087] The external electrode 4 may have only the electrode portion 4a or only the electrode portion 4b, and the external electrode 5 may have only the electrode portion 5a or only the electrode portion 5b. [Explanation of symbols]

[0088] 1... multilayer coil component, 2... element body, 20... coil, 21 to 29, C... coil conductor, Ax... coil axis, D1... first direction, D2... second direction, D3... third direction, Dc1... first distance (distance between conductor portions), Dc2... second distance (distance between conductor portions), Dc3... third distance (distance between conductor portions), MM... metal magnetic particles, RE... resin, SC1... first conductor portion, SC2... second conductor portion, SC3... third conductor portion, SF2... side surface.

Claims

1. A laminated coil component manufactured by stacking and pressurizing sheets on which coil conductors are formed, an element including a plurality of metal magnetic particles and a resin present between the plurality of metal magnetic particles; a coil disposed within the element body and including a plurality of coil conductors electrically connected to one another; At least some of the plurality of coil conductors are spirally shaped and have conductor portions that are adjacent to each other when viewed in a direction along the coil axis of the coil, the plurality of metal magnetic particles included in the element body include a plurality of metal magnetic particles having a particle diameter that is ⅓ or more and ½ or less of the distance between the conductor portions adjacent to each other in the coil conductor, Between the conductor portions adjacent to each other in the coil conductor, the metal magnetic particles having the particle diameter are aligned along the opposing direction of the conductor portions, the conductor portion of the coil conductor includes a first conductor portion extending linearly along a first direction, a second conductor portion extending linearly along a second direction intersecting the first direction, and a third conductor portion connecting the first conductor portion and the second conductor portion and constituting a corner portion of the coil conductor, a distance between adjacent third conductor portions is greater than a distance between adjacent first conductor portions and a distance between adjacent second conductor portions.

2. 2. The laminated coil component according to claim 1, wherein, in a cross section taken along the facing direction, an area of ​​a region in which the metal magnetic particles having the particle diameter are aligned along the facing direction is larger than 50% of an area of ​​a region between the conductor portions adjacent to each other in the facing direction.

3. the conductor portion has a pair of side surfaces facing each other in the facing direction, 3. The laminated coil component according to claim 1, wherein the surface roughness of the pair of side surfaces is less than 40% of the average particle diameter of the plurality of metal magnetic particles contained in the element body.

4. 4. The laminated coil component according to claim 1, wherein the plurality of coil conductors are plated conductors.

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