Laminated coil component

Abstract

The present invention relates to a laminated coil component comprising: a laminated body which is formed by laminating a plurality of insulating layers in a lamination direction and in which a coil is provided; and an external electrode provided on a surface of the laminate and electrically connected to the coil, the laminate having a first end surface and a second end surface facing each other in a longitudinal direction, a first main surface and a second main surface facing each other in a height direction orthogonal to the longitudinal direction, and a first side surface and a second side surface facing each other in a width direction orthogonal to the longitudinal direction and the height direction, the external electrode has: a first external electrode extending from at least a portion of the first end surface of the laminate to a portion of the first main surface; and a second external electrode extending from at least a part of the second end surface of the laminated body to a part of the first main surface, the lamination direction of the laminated body and the coil axis of the coil being parallel to the first main surface, the transmission coefficient S21 in the range of 1 GHz to less than 40 GHz being-1.0 dB or more, and the transmission coefficient S21 in the range of 40 GHz to 60 GHz being-1.5 dB or more.

Description

[0001] This application is a divisional application of the application with application number 2021 1 1030 857.4, application date September 3, 2021, and invention name “Laminated coil component” Technical Field

[0002] The present invention relates to a laminated coil component. Background Art

[0003] Patent Document 1 discloses a laminated coil component including a laminated body formed by laminating a plurality of insulating layers and having a coil built therein, and external electrodes.

[0004] It is described that the laminated coil component has excellent high frequency characteristics and that the transmission coefficient S21 at 40 GHz and 50 GHz is equal to or higher than a specific value.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-186255

[0006] With the recent increase in communication speed and miniaturization of electronic devices, laminated coil components are required to have sufficient high-frequency characteristics in a higher frequency band (for example, a GHz band of 60 GHz or more).

[0007] The laminated coil component described in Patent Document 1 uses a ferrite material as the material of its insulating layer. Since the relative dielectric constant of the ferrite material is as high as about 15, the laminated coil component using the ferrite material has a large loss in the frequency region around 60 GHz, and further improvement is desired. Summary of the invention

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a laminated coil component suitable for use in a frequency range up to about 60 GHz.

[0009] The laminated coil component of the present invention is characterized in that it comprises: a laminated body formed by laminating a plurality of insulating layers in a laminating direction and having a coil disposed therein; and an external electrode disposed on a surface of the laminated body and electrically connected to the coil, the laminated body comprising: a first end face and a second end face opposite to each other in a length direction, a first main face and a second main face opposite to each other in a height direction orthogonal to the length direction, and a first side face and a second side face opposite to each other in a width direction orthogonal to the length direction and the height direction, the external electrode comprising: a first external electrode extending from at least a portion of the first end face of the laminated body Extending over a portion of the above-mentioned first main surface; and a second external electrode extending from at least a portion of the above-mentioned second end surface of the above-mentioned stacked body over a portion of the above-mentioned first main surface, the stacking direction of the above-mentioned stacked body and the coil axis of the above-mentioned coil are parallel to the above-mentioned first main surface, the above-mentioned insulating layer has a ferrite phase, and a non-magnetic phase composed of a material with a lower dielectric constant than the ferrite material constituting the above-mentioned ferrite phase, the transmission coefficient S21 in the range of 1 GHz to less than 40 GHz is greater than -1.0 dB, and the transmission coefficient S21 in the range of 40 GHz to 60 GHz is greater than -1.5 dB.

[0010] According to the present invention, it is possible to provide a laminated coil component suitable for use in a frequency range up to about 60 GHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view schematically showing an example of the laminated coil component of the present invention.

[0012] Figure 2 It is a cross-sectional view schematically showing an example of the laminated coil component of the present invention.

[0013] Figure 3 It is a schematic representation of the composition Figure 2 Schematic diagram of an exploded perspective view of the insulating layer of the laminated coil component shown.

[0014] Figure 4 It is a schematic representation of the composition Figure 2 Schematic diagram of an exploded plan view of the insulating layer of the laminated coil component shown.

[0015] Figure 5 This is a diagram schematically showing a method for measuring the transmission coefficient S21.

[0016] Figure 6 This is a graph showing the transmittance S21 of the sample prepared in Example 2.

[0017] Figure 7 This is a graph showing the transmittance S21 of the sample prepared in Comparative Example 1.

[0018] Description of Reference Numerals

[0019] 1…laminated coil component; 10…laminated body; 11…first end surface; 12…second end surface; 13…first principal surface; 14…second principal surface; 15…first side surface; 16…second side surface; 21…first external electrode; 22…second external electrode; 30…coil; 31, 31a, 31b, 31c, 31d, 35a, 35a1, 35a2, 35a3, 35a4, 35b, 35b1, 35b2, 35b3, 35b4, 35b5, 35b6, 35b7, 35b8, 35b9, 35b10, 35b111, 35b12, 35b13, 35b14, 35b15 5b4…insulating layer; 32, 32a, 32b, 32c, 32d…coil conductor; 33a, 33b, 33c, 33d, 33p, 33q…via conductor; 36a, 36b, 36c, 36d…line portion; 37a, 37b, 37c, 37d…pad portion; 41…first connecting conductor; 42…second connecting conductor; 60…measurement fixture; 61…signal path; 62…ground conductor; 63…network analyzer. DETAILED DESCRIPTION

[0020] Hereinafter, the laminated coil component of the present invention will be described.

[0021] However, the present invention is not limited to the following structures and modes, and can be appropriately changed and applied within the scope of not changing the gist of the present invention. In addition, the structure in which two or more of the preferred structures and modes of the present invention described below are combined is also the present invention.

[0022] Figure 1 It is a perspective view schematically showing an example of the laminated coil component of the present invention.

[0023] Figure 1 The laminated coil component 1 shown has a laminate 10, a first external electrode 21 and a second external electrode 22. The laminate 10 is a roughly rectangular parallelepiped shape having 6 faces. The structure of the laminate 10 will be described later, and is formed by stacking a plurality of insulating layers in a stacking direction, and a coil is provided inside. The first external electrode 21 and the second external electrode 22 are electrically connected to the coil, respectively.

[0024] In the laminated coil component and the laminated body in this specification, the length direction, height direction, and width direction are referred to as Figure 1 Here, the length direction (x direction), the height direction (y direction) and the width direction (z direction) are orthogonal to each other.

[0025] The longitudinal direction (x direction) is a direction parallel to the stacking direction.

[0026] like Figure 1As shown, the stack 10 has a first end face 11 and a second end face 12 opposite to each other in the length direction (x direction), a first main face 13 and a second main face 14 opposite to each other in the height direction (y direction) orthogonal to the length direction, and a first side face 15 and a second side face 16 opposite to each other in the width direction (z direction) orthogonal to the length direction and the height direction.

[0027] Although in Figure 1 Although not shown in the figure, it is preferred that the corners and ridges of the laminate 10 are rounded. The corner is the portion where three faces of the laminate intersect, and the ridge is the portion where two faces of the laminate intersect.

[0028] The first external electrode and the second external electrode are external electrodes extending from at least a portion of the end surface of the stacked body to the main surface of the stacked body.

[0029] exist Figure 1 In the laminated coil component 1 shown, the first external electrode 21 is arranged to cover a portion of the first end surface 11 of the laminate 10 , and extends from the first end surface 11 to cover a portion of the first main surface 13 .

[0030] In addition, Figure 1 In the embodiment, the height of the first external electrode 21 covering the portion of the first end surface 11 of the stack 10 is constant, but the shape of the first external electrode 21 is not particularly limited as long as it covers a portion of the first end surface 11 of the stack 10. For example, in the first end surface 11 of the stack 10, the first external electrode 21 may be a mountain shape that becomes higher from the end toward the center. In addition, the length of the first external electrode 21 covering the portion of the first main surface 13 of the stack 10 is constant, but the shape of the first external electrode 21 is not particularly limited as long as it covers a portion of the first main surface 13 of the stack 10. For example, in the first main surface 13 of the stack 10, the first external electrode 21 may be a mountain shape that becomes longer from the end toward the center.

[0031] like Figure 1 As shown, the first external electrode 21 may also be configured to further extend from the first end surface 11 and the first main surface 13 to cover a portion of the first side surface 15 and a portion of the second side surface 16. In this case, it is preferred that the first external electrode 21 covering the portion of the first side surface 15 and the second side surface 16 is formed to be inclined relative to the ridgeline portion intersecting with the first end surface 11 and the ridgeline portion intersecting with the first main surface 13. In addition, the first external electrode 21 may not be configured to cover a portion of the first side surface 15 and a portion of the second side surface 16.

[0032] exist Figure 1 In the laminated coil component 1 shown, the second external electrode 22 is arranged to cover a portion of the second end surface 12 of the laminate 10 , and extends from the second end surface 12 to cover a portion of the first main surface 13 .

[0033] Similar to the first external electrode 21 , the second external electrode 22 covers a region of the second end surface 12 including a ridge portion intersecting the first main surface 13 .

[0034] As with the first external electrode 21, the shape of the second external electrode 22 is not particularly limited as long as it covers a portion of the second end surface 12 of the stack 10. For example, in the second end surface 12 of the stack 10, the second external electrode 22 may be in the shape of a mountain that becomes higher from the end toward the center. In addition, the shape of the second external electrode 22 is not particularly limited as long as it covers a portion of the first main surface 13 of the stack 10. For example, in the first main surface 13 of the stack 10, the second external electrode 22 may be in the shape of a mountain that becomes longer from the end toward the center.

[0035] Similar to the first external electrode 21, the second external electrode 22 may be configured to further extend from the second end surface 12 and the first main surface 13 to cover a portion of the first side surface 15 and a portion of the second side surface 16. In this case, it is preferred that the second external electrode 22 covering the portion of the first side surface 15 and the portion of the second side surface 16 is formed to be inclined relative to the ridgeline portion intersecting with the second end surface 12 and the ridgeline portion intersecting with the first main surface 13. In addition, the second external electrode 22 may not be configured to cover a portion of the first side surface 15 and a portion of the second side surface 16.

[0036] Since the first external electrode 21 and the second external electrode 22 are arranged as described above, when the laminated coil component 1 is mounted on a substrate, the first principal surface 13 of the laminate 10 serves as a mounting surface.

[0037] In addition, you can also Figure 1 Unlike the illustrated embodiment, the first external electrode covers the entire first end surface of the laminate and extends from the first end surface to cover a portion of the first main surface, a portion of the second main surface, a portion of the first side surface, and a portion of the second side surface.

[0038] Alternatively, the second external electrode may cover the entire second end surface of the stacked body and extend from the second end surface to cover a portion of the first principal surface, a portion of the second principal surface, a portion of the first side surface, and a portion of the second side surface.

[0039] In this case, any one of the first main surface, the second main surface, the first side surface, and the second side surface of the laminated body serves as the mounting surface.

[0040] The size of the laminated coil component of the present invention is not particularly limited, but is preferably 0603 size, 0402 size, or 1005 size.

[0041] The laminated coil component of the present invention has a transmission coefficient S21 of -1.0 dB or more in the range of 1 GHz to less than 40 GHz, and a transmission coefficient S21 of -1.5 dB or more in the range of 40 GHz to 60 GHz.

[0042] The transmission coefficient S21 is obtained from the power ratio of the transmission signal to the input signal. The transmission coefficient S21 is basically a dimensionless quantity, but is usually expressed in dB using a common logarithm.

[0043] The transmission coefficient S21 for each frequency is obtained by measuring the power of the input signal to the laminated coil component and the transmission signal using a network analyzer. The transmission coefficient S21 can be obtained by changing the frequency to obtain the transmission coefficient S21.

[0044] A specific example of a measuring device for the transmission coefficient S21 will be described in the section of Examples.

[0045] The transmission coefficient S21 being -1.0 dB or more in the range of 1 GHz to less than 40 GHz means that when the transmission coefficient S21 is measured while changing the frequency, the transmission coefficient S21 is -1.0 dB or more in the entire range of 1 GHz to less than 40 GHz.

[0046] The transmission coefficient S21 being -1.5 dB or more in the range of 40 GHz to 60 GHz means that when the transmission coefficient S21 is measured while changing the frequency, the transmission coefficient S21 is -1.5 dB or more in the entire range of 40 GHz to less than 60 GHz.

[0047] When the transmission coefficient S21 of the laminated coil component satisfies the above-mentioned characteristics, it can be applied to, for example, a bias-Tee circuit in an optical communication circuit, etc. In particular, it can be more applied to an optical communication module used in a frequency range up to 60 GHz.

[0048] The laminated coil component preferably has a transmission coefficient S21 of -0.5 dB or more in a range of 1 GHz to less than 40 GHz, and preferably has a transmission coefficient S21 of -1.2 dB or more in a range of 40 GHz to 60 GHz.

[0049] The insulating layer has a ferrite phase and a non-magnetic phase made of a material having a lower dielectric constant than a ferrite material constituting the ferrite phase.

[0050] The ferrite phase is a phase containing a ferrite material, and may be a phase consisting only of a ferrite material.

[0051] The ferrite phase is preferably composed of a Ni-Cu-Zn ferrite material. When the ferrite phase is composed of a Ni-Cu-Zn ferrite material, the inductance of the laminated coil component is improved.

[0052] The Ni-Cu-Zn ferrite material preferably contains 40 mol% to 49.5 mol% of Fe2O3, 5 mol% to 35 mol% of ZnO, 4 mol% to 12 mol% of CuO, and the remainder of NiO. These oxides may contain inevitable impurities.

[0053] The Ni-Cu-Zn based ferrite material may further contain additives such as Mn3O4, Bi2O3, Co3O4, SnO2, etc.

[0054] The ferrite phase is a phase containing Fe in elemental analysis, and preferably contains Fe, Zn, Cu, and Ni. The ferrite phase may further contain Mn, Bi, Co, Sn, and the like.

[0055] The ferrite phase preferably contains: 40 mol% to 49.5 mol% Fe in terms of Fe2O3, 2 mol% to 35 mol% Zn in terms of ZnO, 6 mol% to 13 mol% Cu in terms of CuO, and 10 mol% to 45 mol% Ni in terms of NiO.

[0056] The non-magnetic phase is a phase composed of a material having a lower dielectric constant than that of the ferrite material.

[0057] Examples of the material constituting the non-magnetic phase include glass materials, forsterite (2MgO·SiO2), willemite [aZnO·SiO2 (a is 1.8 or more and 2.2 or less)], etc. As the glass material, borosilicate glass is preferred.

[0058] Borosilicate glass preferably contains Si in a ratio of 80% to 85% by weight when converted to SiO2, 10% to 25% by weight when converted to B2O3, 0.5% to 5% by weight when converted to A2O, and 0% to 5% by weight when converted to Al2O3. Examples of the alkali metal A include K and Na.

[0059] The ferrite phase and the non-magnetic phase are distinguished as follows. First, the laminated body of the laminated coil component is polished to expose the cross section along the lamination direction, and then element mapping is performed by scanning transmission electron microscopy-energy dispersive X-ray analysis (STEM-EDX). Then, the area where the Fe element exists is regarded as the ferrite phase, and the area outside the ferrite phase is regarded as the non-magnetic phase to distinguish the two phases.

[0060] In addition, the cross section along the stacking direction is described later. Figure 2 Cross section shown.

[0061] With respect to the ferrite phase and the non-magnetic phase thus divided, the ferrite material constituting the ferrite phase has a high dielectric constant, while the material constituting the non-magnetic phase has a lower dielectric constant than the ferrite material.

[0062] The relative dielectric constant of the ferrite material may be, for example, not less than 14.5 and not more than 15.5.

[0063] The relative dielectric constant of the material constituting the non-magnetic phase is not limited as long as it is lower than the relative dielectric constant of the ferrite material, but is preferably 7.0 or less, and more preferably 5.0 or less, for example.

[0064] Since the insulating layer constituting the laminated coil component contains a non-magnetic phase composed of a material having a lower dielectric constant than the ferrite material, the dielectric constant of the insulating layer is reduced. Since the dielectric constant of the insulating layer is reduced, the loss of the laminated coil component is reduced, and in particular, the loss in the region up to a frequency of 60 GHz can be reduced. Therefore, the laminated coil component of the present invention becomes a laminated coil component suitable for use in the region up to a frequency of 60 GHz.

[0065] In order to determine the relative dielectric constant of the ferrite material and the relative dielectric constant of the material constituting the non-magnetic phase, the structural formula of the ferrite material constituting the ferrite phase is determined by the above-mentioned element mapping, and the structural formula of the material constituting the non-magnetic phase is determined. Then, according to a known database, the relative dielectric constant of the compound that becomes the structural formula is obtained. Through this step, the relative dielectric constant of the ferrite material and the relative dielectric constant of the material constituting the non-magnetic phase can be determined respectively.

[0066] In addition, the relative dielectric constant of the ferrite material can be obtained by forming a dielectric constant measurement sample formed by molding a ferrite material into a specified shape, forming electrodes thereon, and measuring the electrostatic capacitance under specified conditions. Based on the measured value of the electrostatic capacitance and the size of the dielectric constant measurement sample, the relative dielectric constant of the ferrite material can be obtained. Similarly, the relative dielectric constant of the material constituting the non-magnetic phase can be obtained by forming a dielectric constant measurement sample formed by molding the material constituting the non-magnetic phase into a specified shape.

[0067] The volume ratio of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase is preferably 55 volume % or more and 80 volume % or less. By making the volume ratio of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase 55 volume % or more and 80 volume % or less, the characteristics of the transmission coefficient S21 in the high frequency region can be made within a more preferred range in the laminated coil component.

[0068] When the ratio of the volume of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase is less than 55 volume %, since the amount of material with a low relative dielectric constant is small, the effect of reducing the loss in the high-frequency region is reduced by that amount.

[0069] On the other hand, when the ratio of the volume of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase exceeds 80 volume %, the strength of the laminate may be insufficient due to the excessive ratio of the non-magnetic phase.

[0070] From the viewpoint of improving the high frequency characteristics of the laminated coil component, the ratio of the volume of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase is preferably 60 volume % or more and 80 volume % or less.

[0071] The ratio of the volume of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase is determined as follows: First, the laminate constituting the laminated coil component is ground to the center in a direction perpendicular to the stacking direction to expose a cross section along the stacking direction.

[0072] Next, near the center of the exposed cross section, after extracting three 50 μm angle regions, element mapping is performed by scanning transmission electron microscope-energy dispersion X-ray analysis, thereby distinguishing the ferrite phase from the non-magnetic phase as described above. Then, for each region at the above 3 locations, according to the obtained element mapping image, the ratio of the area of ​​the non-magnetic phase to the total area of ​​the ferrite phase and the non-magnetic phase is determined using image analysis software. Then, the average value is calculated based on the measured values ​​of these area ratios, and the average value is used as the ratio of the volume of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase.

[0073] Furthermore, the ratio of the volume of forsterite to the total volume of the non-magnetic phase is preferably 2 volume % or more and 8 volume % or less.

[0074] The volume ratio of forsterite contained in the non-magnetic phase can be obtained by distinguishing the region containing Mg, an element contained in forsterite, as the region containing forsterite and measuring the ratio of the area of ​​the region containing forsterite to the area of ​​the non-magnetic phase.

[0075] When 2% by volume or more and 8% by volume or less of the non-magnetic phase is forsterite, the strength of the laminated body is improved.

[0076] The insulating layer preferably includes: B converted into B2O3 of more than 4.3 weight % and less than 8.0 weight %, Si converted into SiO2 of more than 27.6 weight % and less than 51.4 weight %, Mg converted into MgO of more than 1.1 weight % and less than 2.1 weight %, Fe converted into Fe2O3 of more than 24.7 weight % and less than 43.5 weight %, Ni converted into NiO of more than 3.3 weight % and less than 5.9 weight %, Zn converted into ZnO of more than 7.7 weight % and less than 13.5 weight %, and Cu converted into CuO of more than 2.0 weight % and less than 3.6 weight %.

[0077] The composition of the insulating layer was confirmed by analysis using inductively coupled plasma atomic emission spectroscopy (ICP-AES).

[0078] Next, an example of a coil built into a laminated body constituting a laminated coil component will be described.

[0079] The coil is formed by electrically connecting a plurality of coil conductors stacked in a stacking direction together with an insulating layer.

[0080] Figure 2 is a cross-sectional view schematically showing an example of a laminated coil component of the present invention, Figure 3 It is a schematic representation of the composition Figure 2 FIG. 1 is an exploded perspective view showing the state of the insulating layer of the laminated coil component shown in FIG. Figure 4 It is a schematic representation of the composition Figure 2 Schematic diagram of an exploded plan view of the insulating layer of the laminated coil component shown.

[0081] Figure 2 The insulating layer, the coil conductor, the connection conductor, and the stacking direction of the stacked body are schematically shown, and actual shapes and connections, etc. are not strictly shown. For example, the coil conductors are connected via via conductors.

[0082] like Figure 2 As shown, the laminated coil component 1 includes a laminate 10 in which a coil formed by electrically connecting a plurality of coil conductors 32 laminated together with an insulating layer is built, and a first external electrode 21 and a second external electrode 22 electrically connected to the coil.

[0083] The laminate 10 includes a region where the coil conductor is arranged and a region where the first connecting conductor 41 or the second connecting conductor 42 is arranged. Figure 2 In FIG. 1 , the coil axis A) is shown parallel to the first main surface 13 .

[0084] like Figure 3 and Figure 4 As shown, the laminate 10 includes an insulating layer 31a, an insulating layer 31b, an insulating layer 31c, and an insulating layer 31d as Figure 2 The laminate 10 includes an insulating layer 35a1, an insulating layer 35a2, an insulating layer 35a3, and an insulating layer 35a4 as Figure 2 The laminate 10 includes an insulating layer 35b1, an insulating layer 35b2, an insulating layer 35b3, and an insulating layer 35b4 as Figure 2 The insulating layer 35b in.

[0085] The coil 30 includes a coil conductor 32a, a coil conductor 32b, a coil conductor 32c, and a coil conductor 32d as Figure 2 The coil conductor 32 in.

[0086] The coil conductor 32a, the coil conductor 32b, the coil conductor 32c, and the coil conductor 32d are arranged on the main surfaces of the insulating layer 31a, the insulating layer 31b, the insulating layer 31c, and the insulating layer 31d, respectively.

[0087] The lengths of the coil conductor 32a, the coil conductor 32b, the coil conductor 32c, and the coil conductor 32d are respectively the lengths of 3 / 4 turns of the coil 30. That is, the number of layers of the coil conductors for constituting the three turns of the coil 30 is 4. In the laminated body 10, the coil conductors 32a, the coil conductors 32b, the coil conductors 32c, and the coil conductors 32d are repeatedly laminated as a unit (three turns).

[0088] The coil conductor 32a includes a line portion 36a and a pad portion 37a disposed at an end of the line portion 36a. The coil conductor 32b includes a line portion 36b and a pad portion 37b disposed at an end of the line portion 36b. The coil conductor 32c includes a line portion 36c and a pad portion 37c disposed at an end of the line portion 36c. The coil conductor 32d includes a line portion 36d and a pad portion 37d disposed at an end of the line portion 36d.

[0089] Via-hole conductors 33a, 33b, 33c, and 33d are respectively arranged in the insulating layers 31a, 31b, 31c, and 31d so as to penetrate in the stacking direction.

[0090] The insulating layer 31a with the coil conductor 32a and the via-hole conductor 33a, the insulating layer 31b with the coil conductor 32b and the via-hole conductor 33b, the insulating layer 31c with the coil conductor 32c and the via-hole conductor 33c, and the insulating layer 31d with the coil conductor 32d and the via-hole conductor 33d are considered as a unit ( Figure 3 and Figure 4 Thus, the pad portion 37a of the coil conductor 32a, the pad portion 37b of the coil conductor 32b, the pad portion 37c of the coil conductor 32c, and the pad portion 37d of the coil conductor 32d are connected via the via hole conductor 33a, the via hole conductor 33b, the via hole conductor 33c, and the via hole conductor 33d. That is, the pad portions of the coil conductors adjacent to each other in the stacking direction are connected to each other via the via hole conductor.

[0091] Thus, the solenoid-shaped coil 30 built in the laminated body 10 is formed.

[0092] When viewed from above in the stacking direction, the coil 30 composed of the coil conductor 32a, the coil conductor 32b, the coil conductor 32c and the coil conductor 32d may be circular or polygonal. When viewed from above in the stacking direction, if the coil 30 is polygonal, the diameter of the circle equivalent to the area of ​​the polygon is used as the coil diameter of the coil 30, and the axis passing through the center of gravity of the polygon and extending in the stacking direction is used as the coil axis of the coil 30.

[0093] The via conductors 33p are arranged in the insulating layers 35a1, 35a2, 35a3 and 35a4 so as to penetrate in the stacking direction. The pads connected to the via conductors 33p may be arranged on the main surfaces of the insulating layers 35a1, 35a2, 35a3 and 35a4.

[0094] The insulating layer 35a1 with the via hole conductor 33p, the insulating layer 35a2 with the via hole conductor 33p, the insulating layer 35a3 with the via hole conductor 33p, and the insulating layer 35a4 with the via hole conductor 33p are stacked so as to overlap with the insulating layer 31a with the coil conductor 32a and the via hole conductor 33a. Thus, the via hole conductors 33p are connected to each other to form the first connection conductor 41, and the first connection conductor 41 is exposed at the first end surface 11. As a result, the first external electrode 21 and the coil 30 are connected to each other via the first connection conductor 41.

[0095] As described above, the first connection conductor 41 preferably connects the first external electrode 21 and the coil 30 in a straight line. The first connection conductor 41 connects the first external electrode 21 and the coil 30 in a straight line, which means that the via-hole conductors 33p constituting the first connection conductor 41 overlap each other when viewed from above in the stacking direction, and the via-hole conductors 33p may not be arranged strictly in a straight line.

[0096] The via conductors 33q are arranged in the insulating layers 35b1, 35b2, 35b3, and 35b4 so as to penetrate in the stacking direction. The pads connected to the via conductors 33q may be arranged on the main surfaces of the insulating layers 35b1, 35b2, 35b3, and 35b4.

[0097] The insulating layer 35b1 with the via hole conductor 33q, the insulating layer 35b2 with the via hole conductor 33q, the insulating layer 35b3 with the via hole conductor 33q, and the insulating layer 35b4 with the via hole conductor 33q are stacked so as to overlap with the insulating layer 31d with the coil conductor 32d and the via hole conductor 33d. Thus, the via hole conductors 33q are connected to each other to form the second connection conductor 42, and the second connection conductor 42 is exposed at the second end surface 12. As a result, the second external electrode 22 and the coil 30 (coil conductor 32d) are connected to each other via the second connection conductor 42.

[0098] As described above, the second connection conductor 42 preferably connects the second external electrode 22 and the coil 30 in a straight line. The second connection conductor 42 connects the second external electrode 22 and the coil 30 in a straight line, which means that the via-hole conductors 33q constituting the second connection conductor 42 overlap each other when viewed from above in the stacking direction, and the via-hole conductors 33q may not be arranged strictly in a straight line.

[0099] When the via hole conductor 33p constituting the first connecting conductor 41 and the via hole conductor 33q constituting the second connecting conductor 42 are connected to pad portions, the shapes of the first connecting conductor 41 and the second connecting conductor 42 are shapes excluding the pad portions.

[0100] exist Figure 3 and Figure 4 , the case where the number of stacking layers of the coil conductor for forming three turns of the coil 30 is 4, that is, the case where the repeated shape is a 3 / 4 turn shape is illustrated, but the number of stacking layers of the coil conductor for forming one turn of the coil is not particularly limited.

[0101] For example, the number of layers of the coil conductor constituting one turn of the coil may be 2, that is, the repeated shape may be a 1 / 2 turn shape.

[0102] Preferably, the coil conductors constituting the coil overlap each other when viewed from above in the stacking direction. In addition, preferably, the shape of the coil is circular when viewed from above in the stacking direction. In addition, when the coil includes a pad portion, the shape of the coil without the pad portion (i.e., the shape of the line portion) is used as the shape of the coil.

[0103] In addition, when a via-hole conductor constituting a connection conductor is connected to a pad portion, the shape excluding the pad portion (that is, the shape of the via-hole conductor) is used as the shape of the connection conductor.

[0104] also, Figure 3 The coil conductor shown has a circular shape in which a pattern is repeated, but may also have a polygonal shape such as a quadrilateral.

[0105] In addition, the repetitive shape of the coil conductor may be a 1 / 2 turn shape instead of a 3 / 4 turn shape.

[0106] The first external electrode and the second external electrode may each have a single-layer structure or a multi-layer structure.

[0107] When the first external electrode and the second external electrode each have a single-layer structure, examples of the constituent material of each external electrode include silver, gold, copper, palladium, nickel, aluminum, and alloys containing at least one of these metals.

[0108] When the first external electrode and the second external electrode are respectively multilayer structures, each external electrode may have, for example, a base electrode layer containing silver, a nickel coating, and a tin coating in order from the surface side of the laminate. Alternatively, it may have a base electrode layer containing silver, a nickel coating, and a gold coating.

[0109] exist Figure 2 , Figure 3 as well as Figure 4 In the laminated coil component having the structure shown, when the size of the laminated coil component is 0603 size, it is preferable to design as follows in order to further improve the high frequency characteristics.

[0110] The number of turns of the coil is preferably not less than 36 and not more than 42. When the number of turns is within this range, the total electrostatic capacitance between the coil conductors can be reduced, so the transmission coefficient S21 can be within a good range.

[0111] In addition, the coil length is preferably not less than 0.41 mm and not more than 0.48 mm.

[0112] The width of the coil conductor is preferably not less than 45 μm and not more than 75 μm. Figure 2 The dimensions are shown by the double-headed arrow W.

[0113] The thickness of the coil conductor is preferably 3.5 μm or more and 6.0 μm or less. Figure 2 The dimensions are shown by the double-headed arrow T.

[0114] The distance between the coil conductors is preferably 3.0 μm or more and 5.0 μm or less. Figure 2 The dimensions are shown by the double-headed arrow D.

[0115] The diameter of the pad portion of the coil conductor is preferably 30 μm or more and 50 μm or less. Figure 4 The dimensions are shown by the double-headed arrow R.

[0116] When the first main surface of the laminate is the mounting surface, the length of the first external electrode and the length of the second external electrode covering the first main surface of the laminate are each preferably 0.20 mm or less and preferably 0.10 mm or more.

[0117] The length of the first external electrode covering the first main surface of the stacked body and the length of the second external electrode are Figure 2 The dimensions are shown by the double-headed arrow E1.

[0118] The relative dielectric constant of the insulating layer constituting the laminated coil component of the present invention is preferably 8.5 or less. Also, it is preferably 8.0 or less, and may be 6.5 or more.

[0119] The relative dielectric constant of the insulating layer constituting the laminated coil component can be measured as follows.

[0120] A dielectric constant measurement sample is prepared in which the insulating layer is formed into a specified shape (e.g., a disk shape). After forming electrodes on the sample, the electrostatic capacitance is measured under the conditions of a frequency of 1 MHz and a voltage of 1 Vrms. Then, based on the measured value of the electrostatic capacitance, the relative dielectric constant is calculated according to the diameter and thickness of the disk-shaped sample.

[0121] The laminated coil component of the present invention is produced, for example, by the following method.

[0122] <Ferrite material production process>

[0123] Fe2O3, ZnO, CuO and NiO are weighed so as to be in a predetermined ratio. Each oxide may also contain inevitable impurities. Next, these weighed materials are wet mixed and then crushed to form a slurry. At this time, additives such as Mn3O4, Bi2O3, Co3O4, SiO2, SnO2, etc. may also be added. Then, the obtained slurry is dried and pre-fired. The pre-fired temperature is, for example, above 700°C and below 800°C. In this way, a powdered ferrite material is produced.

[0124] The ferrite material preferably contains 40 mol% to 49.5 mol% inclusive of Fe2O3, 2 mol% to 35 mol% inclusive of ZnO, 6 mol% to 13 mol% inclusive of CuO, and 10 mol% to 45 mol% inclusive of NiO.

[0125] <Non-magnetic material production process>

[0126] The powder of the non-magnetic material is weighed. When a mixed powder of borosilicate glass powder and forsterite powder is used as the non-magnetic material, a glass powder containing potassium, boron, silicon, and aluminum at a predetermined ratio is prepared as borosilicate glass. In addition, forsterite powder is prepared.

[0127] Borosilicate glass preferably contains the following proportions: Si converted into SiO2 in an amount of 80 weight % or more and 85 weight % or less, B converted into B2O3 in an amount of 10 weight % or more and 25 weight % or less, alkali metal A converted into A2O in an amount of 0.5 weight % or more and 5 weight % or less, and Al converted into Al2O3 in an amount of 0 weight % or more and 5 weight % or less.

[0128] <Green sheet production process>

[0129] The ferrite material and the non-magnetic material are weighed to a predetermined ratio. Next, these weighed materials are mixed with an organic binder such as polyvinyl butyral resin, an organic solvent such as ethanol and toluene, and a plasticizer, and then crushed to prepare a slurry. Then, the obtained slurry is formed into a sheet of a predetermined thickness by a doctor blade method, and then punched into a predetermined shape to prepare a green sheet.

[0130] The thickness of the green sheet is preferably 20 μm or more and 30 μm or less.

[0131] The ferrite material and the non-magnetic material are preferably mixed while adjusting the volume ratio so that the volume ratio of the non-magnetic material to the total volume of the ferrite material and the non-magnetic material is 50 volume % or more and 80 volume % or less.

[0132] <Conductor pattern forming process>

[0133] First, through holes are formed by irradiating a predetermined portion of a green sheet with laser light.

[0134] Next, a conductive paste such as silver paste is filled into the through hole and applied to the surface of the raw sheet by screen printing or the like. Thus, for the raw sheet, a conductor pattern for a via conductor is formed in the through hole, and a conductor pattern for a coil conductor connected to the conductor pattern for the via conductor is formed on the surface. In this way, a coil sheet having a conductor pattern for a coil conductor and a conductor pattern for a via conductor formed on the raw sheet is produced. A plurality of coil sheets are produced, and each coil sheet is formed with the same Figure 3 and Figure 4 The coil conductor pattern corresponding to the coil conductor shown in FIG. Figure 3 and Figure 4 The via-hole conductor shown corresponds to a conductor pattern for the via-hole conductor.

[0135] In addition, by filling the through holes with a conductive paste such as a silver paste using a screen printing method, a conductive sheet having a conductive pattern for a via hole conductor formed on a green sheet is produced differently from a coil sheet. A plurality of conductive sheets are also produced, and each conductive sheet is formed with a conductive pattern. Figure 3 and Figure 4 The via-hole conductor shown corresponds to a conductor pattern for the via-hole conductor.

[0136] <Laminate preform production process>

[0137] The coil sheet and the conductive sheet are equivalent to Figure 3 and Figure 4 After being stacked in the stacking direction in the order of, thermal compression bonding is performed to produce a stack preform.

[0138] <Laminate and coil production process>

[0139] First, the laminated body preform is cut into predetermined sizes using a dicing machine or the like, thereby producing divided chips.

[0140] Next, the separated chips are fired at a firing temperature of, for example, 900° C. to 920° C., and a firing time of, for example, 2 hours to 8 hours.

[0141] By calcining the sliced ​​chips, the green sheets of the coil sheet and the conductive sheet become insulating layers. As a result, a laminated body is produced in which a plurality of insulating layers are laminated in a lamination direction, here in a longitudinal direction. A ferrite phase and a non-magnetic phase are formed in the laminated body.

[0142] By firing the separated chips, the coil conductor pattern and the via conductor pattern of the coil sheet become coil conductors and via conductors, respectively. As a result, a coil is manufactured in which a plurality of coil conductors are stacked in a stacking direction and electrically connected via via conductors.

[0143] Thus, a laminate and a coil provided inside the laminate are manufactured. The lamination direction of the insulating layer and the direction of the coil axis of the coil are parallel to the first main surface as the mounting surface of the laminate, and here, parallel to the longitudinal direction.

[0144] By firing the sliced ​​chips, the via conductor pattern of the via sheet becomes a via conductor. As a result, a first connecting conductor and a second connecting conductor are formed by stacking and electrically connecting a plurality of via conductors in the length direction. The first connecting conductor is exposed from the first end surface of the stack. The second connecting conductor is exposed from the second end surface of the stack.

[0145] The laminate may be rounded at its corners and ridges by, for example, performing barrel polishing.

[0146] <External electrode forming process>

[0147] First, a conductive paste containing silver and glass frit is applied to the first end face and the second end face of the stack. Next, the obtained coating films are sintered to form a base electrode layer on the surface of the stack. More specifically, a base electrode layer is formed that extends from the first end face of the stack to a portion of each of the first principal face, the second principal face, the first side face, and the second side face. In addition, a base electrode layer is formed that extends from the second end face of the stack to a portion of each of the first principal face, the second principal face, the first side face, and the second side face. The sintering temperature of each coating film is, for example, above 800°C and below 820°C.

[0148] Then, a nickel coating and a tin coating are sequentially formed on the surface of each base electrode layer by electroplating or the like.

[0149] In this way, the first external electrode electrically connected to the coil via the first connecting conductor and the second external electrode electrically connected to the coil via the second connecting conductor are formed.

[0150] In this way, a laminated coil component is manufactured.

[0151] [Example]

[0152] Hereinafter, examples which more specifically disclose the laminated coil component of the present invention will be shown, but the present invention is not limited to these examples.

[0153] [Examples 1 to 4 and Comparative Example 1]

[0154] The laminated bodies for the laminated coil components of Examples 1 to 4 and Comparative Example 1 were produced by the following method.

[0155] <Ferrite material production process>

[0156] The main components are weighed to make a ratio of 48.0 mol% of Fe2O3, 30.0 mol% of ZnO, 14.0 mol% of NiO, and 8.0 mol% of CuO. Next, these weighed materials, pure water, and a dispersant are put into a ball mill together with a PSZ medium, mixed, and then crushed to prepare a slurry. Then, the obtained slurry is dried and pre-calcined at 800°C for 2 hours. In this way, a powdered ferrite material is prepared.

[0157] <Non-magnetic material production process>

[0158] Borosilicate glass powder and forsterite powder were weighed to a volume ratio of borosilicate glass: forsterite = 57.5:2.5. Next, these weighed materials, pure water, dispersant and PSZ medium were put into a ball mill and mixed, and then crushed to prepare slurry. Then, the obtained slurry was dried and pre-calcined at 1100°C for 2 hours. In this way, a powdered non-magnetic material was prepared.

[0159] <Green sheet production process>

[0160] The ferrite material and the non-magnetic material are weighed so that the volume ratio of the ferrite phase and the non-magnetic phase to be formed later is as shown in Table 1 below. Next, these weighed materials, polyvinyl butyral resin as an organic binder, ethanol and toluene as organic solvents, and PSZ medium are put into a ball mill and mixed, and then crushed to prepare slurry. Then, the obtained slurry is formed into a sheet of a specified thickness by a doctor blade method, and then punched into a specified shape to prepare a green sheet.

[0161] <Conductor pattern forming process>

[0162] A conductive paste for an inner conductor containing silver powder and an organic vehicle is prepared.

[0163] Through holes are formed at predetermined locations of the green sheet, and after being filled with a conductive paste to form via-hole conductors, a coil conductor pattern is printed to obtain a coil sheet.

[0164] Furthermore, a via hole is formed by irradiating a predetermined portion of the green sheet with a laser, and a conductive paste is filled in the via hole to form a via hole conductor, thereby obtaining a via sheet.

[0165] <Laminate preform production process>

[0166] The coil sheet and the conductive sheet are equivalent to Figure 3 and Figure 4 After being stacked in the stacking direction in the order of, thermal compression bonding is performed to produce a stacked body preform.

[0167] <Laminate and coil production process>

[0168] The laminate preform was cut into pieces by a dicing machine to produce the pieces of chips. The pieces of chips were then fired at 910° C. for 5 hours to form a laminate. A ferrite phase and a non-magnetic phase were formed in the laminate.

[0169] <External electrode forming process>

[0170] A conductive paste for external electrodes containing silver powder and glass frit is poured into a coating film forming tank to form a coating film of a predetermined thickness, and a portion of the laminate where the external electrodes are to be formed is immersed in the coating film.

[0171] After the impregnation, sintering is performed at a temperature of about 800° C., thereby forming a base electrode layer of an external electrode.

[0172] Next, a nickel coating and a tin coating were sequentially formed on the base electrode layer by electroplating to form external electrodes.

[0173] Thus, laminated coil components of Examples 1 to 4 and Comparative Example 1 were manufactured.

[0174] In addition, Examples 1 to 4 are compositions in which the mixing ratio of the ferrite material and the non-magnetic material is changed, and Comparative Example 1 is a composition in which no non-magnetic material is used.

[0175] <Volume ratio of ferrite phase and non-magnetic phase>

[0176] After the laminated coil component is sealed with resin, grinding is performed until the center of the laminate in the direction orthogonal to the stacking direction, thereby exposing the cross section along the stacking direction. Then, after extracting three 50 μm corner areas near the center of the exposed cross section, element mapping is performed by energy dispersive X-ray analysis using a scanning transmission electron microscope "HD-2300A" manufactured by Hitachi High-Technologies Corporation. As a result, it is confirmed that there are areas with Fe elements and areas without Fe elements. In this way, the area with Fe elements is regarded as a ferrite phase, and the area outside the ferrite phase is regarded as a non-magnetic phase, and the two phases are distinguished.

[0177] Next, for each region at the above three locations, the ratio of the area of ​​the non-magnetic phase to the total area of ​​the ferrite phase and the non-magnetic phase is measured using image analysis software based on the obtained element mapping image. Then, the average value is calculated based on the measured values ​​of these area ratios, and the average value is used as the ratio of the area of ​​the non-magnetic phase to the total area of ​​the ferrite phase and the non-magnetic phase.

[0178] The area ratio of the non-magnetic phase thus obtained is roughly consistent with the ratio of the volume of the non-magnetic material weighed in the process of making the laminate to the total volume of the ferrite material and the non-magnetic material, so the area ratio of the non-magnetic phase is taken as the ratio of the volume of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase. In addition, in Table 1, the ratio of the volume of the ferrite phase to the total volume of the ferrite phase and the non-magnetic phase is expressed as 100-"volume ratio of the non-magnetic phase".

[0179] <Measurement of relative dielectric constant>

[0180] A dielectric constant measurement sample was prepared by molding the ferrite material used in the manufacture of the stacked coil component into a disk shape, and after forming electrodes composed of an In-Ga alloy on the two main surfaces of the sample, the electrostatic capacitance was measured under the conditions of a frequency of 1 MHz and a voltage of 1 Vrms. Then, based on the measured value of the electrostatic capacitance, the relative dielectric constant was calculated according to the diameter and thickness of the disk-shaped sample.

[0181] The relative dielectric constant of the nonmagnetic material used in manufacturing the laminated coil component is also calculated by the same procedure.

[0182] The relative dielectric constant of ferrite material is 15.0, and the relative dielectric constant of non-magnetic material is 4.0.

[0183] <Composition>

[0184] The composition of the insulating layer was confirmed by analyzing it using inductively coupled plasma emission spectroscopy. In addition, Table 1 shows the composition of each component when the total of K2O, B2O3, SiO2, Al2O3, MgO, Fe2O3, NiO, ZnO and CuO is set to 100 weight %.

[0185]

Table 1

[0186]

[0187] (Measurement of Transmission Coefficient S21)

[0188] Figure 5 This is a diagram schematically showing a method for measuring the transmission coefficient S21.

[0189] like Figure 5 As shown, the sample (laminated coil component 1) is welded to a measuring jig 60 provided with a signal path 61 and a ground conductor 62. The first external electrode 21 of the laminated coil component 1 is connected to the signal path 61, and the second external electrode 22 is connected to the ground conductor 62.

[0190] The power of the input signal to the sample and the transmission signal is obtained using the network analyzer 63 , and the transmission coefficient S21 is measured by changing the frequency. One end and the other end of the signal path 61 are connected to the network analyzer 63 .

[0191] Figure 6 This is a graph showing the transmittance S21 of the sample prepared in Example 2.

[0192] Figure 7 This is a graph showing the transmittance S21 of the sample prepared in Comparative Example 1.

[0193] In addition, the closer the transmission coefficient S21 is to 0 dB, the smaller the loss is.

[0194] like Figure 6 As shown, the stacked coil component manufactured in Example 2 has a transmission coefficient S21 of not less than -1.0 dB in the range of not less than 1 GHz and not more than 40 GHz, and a transmission coefficient S21 of not less than -1.5 dB in the range of not less than 40 GHz and not more than 60 GHz, thereby being suitable for use in the frequency range up to around 60 GHz.

[0195] In addition, if Figure 7 As shown, the laminated coil component manufactured in Comparative Example 1 has a large loss in the frequency range of 50 GHz or higher, and the loss near the frequency of 60 GHz is approximately -8.5 dB, which is extremely large.

[0196] In addition, although a graph of the transmission coefficient S21 is not shown, for the stacked coil components of Example 1, Example 3 and Example 4, the transmission coefficient S21 in the range of above 1 GHz and below 40 GHz is above -1.0 dB, and the transmission coefficient S21 in the range of above 40 GHz and below 60 GHz is above -1.5 dB, thereby being suitable for use in the stacked coil components in the region near the frequency of 60 GHz.

Claims

1. A laminated coil component, It is characterized in that have: a laminated body formed by laminating a plurality of insulating layers in a laminating direction and having a coil disposed therein; and an external electrode disposed on a surface of the laminate and electrically connected to the coil, The stacked body has a first end face and a second end face opposite to each other in a longitudinal direction, a first main face and a second main face opposite to each other in a height direction perpendicular to the longitudinal direction, and a first side face and a second side face opposite to each other in a width direction perpendicular to the longitudinal direction and the height direction. The external electrode includes: a first external electrode extending from at least a portion of the first end surface of the stacked body over a portion of the first main surface; and a second external electrode extending from at least a portion of the second end surface of the stacked body over a portion of the first main surface, The stacking direction of the stacked body and the coil axis of the coil are parallel to the first main surface, The insulating layer has a ferrite phase and a non-magnetic phase composed of a material having a lower dielectric constant than the ferrite material constituting the ferrite phase. The ratio of the volume of forsterite to the total volume of the non-magnetic phase is 2 volume % or more and 8 volume % or less.

2. The laminated coil component according to claim 1, It is characterized in that The ratio of the volume of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase is 55 volume % or more and 80 volume % or less.

3. The laminated coil component according to claim 1 or 2, It is characterized in that The insulating layer comprises: Convert B to B 2 O 3 4.3% by weight or more and 8.0% by weight or less, Convert Si to SiO 2 27.6% by weight or more and 51.4% by weight or less, Mg is converted into MgO in an amount of 1.1% by weight or more and 2.1% by weight or less, Convert Fe to Fe 2 O 3 24.7% by weight or more and 43.5% by weight or less, Ni is converted into NiO in an amount of 3.3 wt% or more and 5.9 wt% or less, Zn is 7.7% by weight or more and 13.5% by weight or less as converted to ZnO, The content of Cu calculated as CuO is 2.0 wt% or more and 3.6 wt% or less.

4. A laminated coil component, It is characterized in that have: a laminated body formed by laminating a plurality of insulating layers in a laminating direction and having a coil disposed therein; and an external electrode disposed on a surface of the laminate and electrically connected to the coil, The stacked body has a first end face and a second end face opposite to each other in a longitudinal direction, a first main face and a second main face opposite to each other in a height direction perpendicular to the longitudinal direction, and a first side face and a second side face opposite to each other in a width direction perpendicular to the longitudinal direction and the height direction. The external electrode includes: a first external electrode extending from at least a portion of the first end surface of the stacked body over a portion of the first main surface; and a second external electrode extending from at least a portion of the second end surface of the stacked body over a portion of the first main surface, The stacking direction of the stacked body and the coil axis of the coil are parallel to the first main surface, The insulating layer has a ferrite phase and a non-magnetic phase composed of a material having a lower dielectric constant than the ferrite material constituting the ferrite phase. The insulating layer comprises: Convert B to B 2 O 3 4.3% by weight or more and 8.0% by weight or less, Convert Si to SiO 2 27.6% by weight or more and 51.4% by weight or less, Mg is converted into MgO in an amount of 1.1% by weight or more and 2.1% by weight or less, Convert Fe to Fe 2 O 3 24.7% by weight or more and 43.5% by weight or less, Ni is converted into NiO in an amount of 3.3 wt% or more and 5.9 wt% or less, Zn is 7.7% by weight or more and 13.5% by weight or less as converted to ZnO, The content of Cu calculated as CuO is 2.0 wt% or more and 3.6 wt% or less.

5. The laminated coil component according to claim 4, It is characterized in that The ratio of the volume of the non-magnetic phase to the total volume of the ferrite phase and the non-magnetic phase is 55 volume % or more and 80 volume % or less.

6. The laminated coil component according to claim 4 or 5, It is characterized in that The ratio of the volume of forsterite to the total volume of the non-magnetic phase is 2 volume % or more and 8 volume % or less.

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