Laminated coil component

Abstract

To provide a laminated coil component capable of improving winding efficiency and characteristics, simplifying the structure, and improving a withstand voltage.SOLUTION: A laminated coil component 1 includes a coil portion C inside an insulating element body 2 having a laminated structure, and in a first conductor pattern layer L1 and a second conductor pattern layer L2 that constitute the coil portion C, the positions of end pairs 12a and 12b of an outer conductor line 12 and end pairs 13a and 13b of the inner conductor line 13 facing each other across a dividing region R are shifted in the line direction of the coil portion C passing through the dividing region R.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] In recent years, with the demand for smaller electronic components and higher performance, there has been a demand for smaller and more functional laminated coil components to be mounted on the electronic components. For example, the laminated inductor described in Patent Document 1 has a coil with a so-called multi-winding structure. In this conventional laminated inductor, for example, the outer coil of each layer is wound from one side to the other in the lamination direction, and the inner coil of each layer is wound from the other side to one side in the lamination direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-216023 Summary of the Invention [Problem to be solved by the invention]

[0004] In addition to miniaturization and improved characteristics, the above-mentioned multilayer coil components also face technical challenges, such as simplifying the configuration and improving voltage resistance. For example, in the multilayer inductor of Patent Document 1, the winding efficiency is improved by forming a coil with a multiple winding structure, but the number of types of conductor patterns required increases, which is thought to require time and effort to fabricate each layer.

[0005] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a laminated coil component that can improve winding efficiency and characteristics, as well as simplify the configuration and improve voltage resistance. [Means for solving the problem]

[0006] A laminated coil component according to one aspect of the present disclosure is a laminated coil component including a coil portion inside an insulating base body having a laminated structure, wherein the coil portion includes: a first conductor pattern layer having annular outer conductor lines and inner conductor lines that are partially separated at a predetermined separation region; a second conductor pattern layer having outer connection lines that connect the outer conductor lines of the first conductor pattern layers that are adjacent in the stacking direction at the separation region and inner connection lines that connect the inner conductor lines of the first conductor pattern layers that are adjacent in the stacking direction at the separation region; and a third conductor pattern layer having connection lines that connect the outer conductor lines and inner conductor lines, wherein the positions of the pair of ends of the outer conductor lines and the pair of ends of the inner conductor lines that face each other across the separation region, or the positions of both ends of the outer connection line and both ends of the inner connection line in the separation region, are offset in the line direction of the coil portion that passes through the separation region.

[0007] In this laminated coil component, the outer conductor lines and inner conductor lines of first conductor pattern layers adjacent in the stacking direction are connected to each other, thereby forming a coil portion with a multi-winding structure within the element body. The adoption of such a coil portion with a multi-winding structure improves winding efficiency. In this laminated coil component, the outer conductor lines and inner conductor lines are connected to each other in a stepped manner by outer connection lines and inner connection lines located in the separation regions of the outer conductor lines and inner conductor lines. This makes it possible to ensure a sufficient inner diameter of the coil portion, thereby improving characteristics such as inductance value, DC superposition characteristics, and DC resistance. Furthermore, the number of types of conductor patterns required to form the coil portion can be reduced, thereby avoiding the time and effort required to fabricate each layer.

[0008] Furthermore, in this laminated coil component, the positions of the pair of ends of the outer conductor lines and the pair of ends of the inner conductor lines that face each other across the dividing region, or the positions of both ends of the outer connection line and both ends of the inner connection line in the dividing region, are offset in the line direction of the coil part that passes through the dividing region. This makes it possible to reduce the length of the region where the outer lines and the inner lines are parallel. The region where the outer lines and the inner lines are parallel is more susceptible to voltage than other portions. Therefore, reducing the length of this region makes it possible to improve the withstand voltage.

[0009] The positions of both ends of the outer connection line and both ends of the inner connection line in the dividing region are aligned in the linear direction of the coil portion passing through the dividing region, and the positions of the pair of ends of the outer conductor line and the pair of ends of the inner conductor line facing each other across the dividing region may be offset in the linear direction of the coil portion passing through the dividing region. This configuration more reliably reduces the length of the region where the outer line and the inner line are parallel, thereby more suitably achieving an improvement in voltage resistance.

[0010] In the first conductor pattern layer, the resistivity of a region between the outer conductor line and the inner conductor line may be higher than the resistivity of a central region of the first conductor pattern layer. The region between the outer conductor line and the inner conductor line is more susceptible to voltage than other regions. Therefore, by relatively increasing the resistivity of this region, further improvement in voltage resistance can be achieved.

[0011] In the second conductor pattern layer, the resistivity of the regions between the outer conductor lines and inner conductor lines of the first conductor pattern layer adjacent in the stacking direction may be higher than the resistivity of the central region of the second conductor pattern layer. The regions between the outer conductor lines and inner conductor lines of the first conductor pattern layer adjacent in the stacking direction are more susceptible to voltage than other parts. Therefore, by relatively increasing the resistivity of these regions, the withstand voltage can be further improved.

[0012] The thickness of the second conductor pattern layer may be smaller than the thickness of the first conductor pattern layer. This reduces the thickness of the connection portion between the outer conductor line and the inner conductor line, allowing the coil portion to be wound more densely in the stacking direction. Furthermore, reducing the thickness of the connection portion reduces thermal contraction of the connection portion and thickness fluctuations due to thermal contraction. Therefore, breaks in the connection portion can be reduced.

[0013] A pair of terminal electrodes may be provided on one end surface of the element body in the stacking direction, and the coil portion may have a fourth conductor pattern layer having an extraction conductor that connects the outer conductor line to one of the pair of terminal electrodes and the inner conductor line to the other of the pair of terminal electrodes. In this case, a so-called bottom terminal type multilayer coil component can be configured. A bottom terminal type multilayer coil component can reduce the mounting area and achieve high-density mounting.

[0014] The third conductor pattern layer may connect the outer conductor line and the inner conductor line on the other end surface side of the element body in the stacking direction, thereby ensuring a sufficient number of turns of the coil portion. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to improve winding efficiency and characteristics, as well as simplify the configuration and improve the withstand voltage. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic side view showing a laminated coil component according to an embodiment of the present disclosure. [Figure 2] 2 is a diagram schematically illustrating the configuration of a coil portion of the laminated coil component shown in FIG. 1. FIG. [Figure 3] FIG. 2 is a schematic exploded perspective view showing an example of a layer structure of the laminated coil component shown in FIG. [Figure 4] 2(a) and 2(b) are plan views showing a first conductor pattern layer of the laminated coil component shown in FIG. 1, and FIG. 2(c) is a plan view showing a second conductor pattern layer of the laminated coil component shown in FIG. 1. [Figure 5] 2A is a schematic, partially enlarged cross-sectional view showing the configuration of an outer winding body in the vicinity of a dividing region of the laminated coil component shown in FIG. 1 , and FIG. 2B is a schematic, partially enlarged cross-sectional view showing the configuration of an inner winding body in the vicinity of the same region. [Figure 6] 1. FIG. 4 is a schematic exploded perspective view showing another example of the layer structure of the laminated coil component shown in FIG. [Figure 7] 7(a) and 7(b) are plan views showing a first conductor pattern layer of the laminated coil component shown in FIG. 6, and 7(c) is a plan view showing a second conductor pattern layer of the laminated coil component shown in FIG. 6. [Figure 8] 7A is a schematic, partially enlarged cross-sectional view showing the configuration of an outer winding body in the vicinity of a dividing region of the laminated coil component shown in FIG. 6, and FIG. 7B is a schematic, partially enlarged cross-sectional view showing the configuration of an inner winding body in the vicinity of the same region. [Figure 9] FIG. 10 is a schematic side view showing a laminated coil component according to another modified example. [Figure 10] FIG. 2 is a schematic exploded perspective view showing an example of a layer structure of the laminated coil component shown in FIG. [Figure 11] 1. FIG. 4 is a schematic exploded perspective view showing another example of the layer structure of the laminated coil component shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, preferred embodiments of a laminated coil component according to one aspect of the present disclosure will be described in detail with reference to the drawings.

[0018] 1 is a schematic side view showing a laminated coil component according to an embodiment of the present disclosure. The laminated coil component 1 is a component that is applied to, for example, a bead inductor or a power inductor. As shown in FIG. 1, the laminated coil component 1 includes a rectangular parallelepiped element body 2 and a pair of terminal electrodes 3, 3.

[0019] The element body 2 includes a pair of end faces 2a, 2b facing each other and a pair of end faces 2c, 2d facing each other in a direction perpendicular to the facing direction of the end faces 2a, 2b. The end face 2a (the bottom face in FIG. 1) is the surface that serves as the mounting surface of the laminated coil component 1. The mounting surface is the surface that faces another electronic device (such as a circuit board or electronic component) when the laminated coil component 1 is mounted on the other electronic device. Note that the rectangular parallelepiped shape here includes a rectangular parallelepiped shape with chamfered corners and ridges, and a rectangular parallelepiped shape with rounded corners and ridges.

[0020] The element body 2 has a layered structure made up of multiple magnetic layers (see FIG. 3). These multiple layers are stacked in the direction in which the end faces 2a, 2b face each other. That is, the stacking direction of the multiple layers coincides with the direction in which the end faces 2a, 2b face each other (hereinafter, the direction in which the end faces 2a, 2b face each other will be referred to as the "stacking direction"). In the actual element body 2, the multiple layers are integrated to the extent that the boundaries between the layers are not visible.

[0021] The element body 2 is made of, for example, metal magnetic particles, ferrite, or glass ceramic-based material. In this embodiment, the element body 2 includes a plurality of metal magnetic particles (not shown). The metal magnetic particles are made of, for example, a soft magnetic alloy. The soft magnetic alloy is, for example, an Fe-Si-based alloy or an FeSiCr-based alloy. When the soft magnetic alloy is an Fe-Si-based alloy, it may also contain P. The soft magnetic alloy may also be, for example, an Fe-Ni-Si-M-based 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.

[0022] In the element body 2, the metal magnetic particles are bonded to each other. The bonding between the metal magnetic particles is realized, for example, by bonding between oxide films formed on the surfaces of the metal magnetic particles. The element body 2 also includes portions filled with resin. The resin is present at least partially between the plurality of metal magnetic particles. The resin is a resin having electrical insulating properties. Examples of resins that can be used include silicone resin, phenol resin, acrylic resin, and epoxy resin. There may be gaps between the plurality of metal magnetic particles that are not filled with resin.

[0023] The laminated coil component 1 shown in FIG. 1 is of a so-called bottom terminal type. A pair of terminal electrodes 3, 3 each have a flat rectangular parallelepiped shape and are arranged spaced apart from each other on the end face 2a of the element body 2 in the opposing direction of the end faces 2c, 2d. The terminal electrode 3 contains a conductive material, such as Ag or Pd. The terminal electrode 3 is, for example, a sintered electrode and is formed 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 may be formed on the surface of the terminal electrode 3. The plating layer is formed by, for example, electroplating. The electroplating is, for example, Ni electroplating or Sn electroplating.

[0024] FIG. 2 is a diagram schematically illustrating the configuration of the coil portion of the laminated coil component shown in FIG. 1. As shown in the figure, a coil portion C is provided inside an element body 2. As shown in FIG. 2, the laminated coil component 1 has a coil portion C with a double winding structure made up of an outer winding body C1 and an inner winding body C2. The outer winding body C1 and the inner winding body C2 have winding directions opposite to each other. In the example of FIG. 2, the outer winding body C1 is a winding body that winds from the end face 2a side to the end face 2b side of the element body 2, and the inner winding body C2 is a winding body that winds from the end face 2b side to the end face 2a side of the element body 2. One end of the outer winding body C1 is drawn to the mounting surface (end face 2a) side of the element body 2 and is connected to one of a pair of terminal electrodes 3, 3. One end of the inner winding body C2 is drawn to the mounting surface (end face 2a) side of the element body 2 and is connected to the other of the pair of terminal electrodes 3, 3. The other end of the outer wound body C1 and the other end of the inner wound body C2 are connected on the side of the surface (end surface 2b) opposite the mounting surface.

[0025] FIG. 3 is a schematic exploded perspective view showing an example of the layer structure of the laminated coil component shown in FIG. 1. As shown in the figure, the multiple layers constituting the coil portion C include a cover layer Lc, a first conductor pattern layer L1, a second conductor pattern layer L2, a third conductor pattern layer L3, and a fourth conductor pattern layer L4. The cover layer Lc is a layer composed only of an element body portion 11 containing metal magnetic particles. Multiple cover layers Lc are arranged on the end surface 2b side of the element body 2. Each layer except the cover layer Lc is formed by hollowing out the element body portion 11 containing the above-mentioned metal magnetic particles in a shape corresponding to the conductor portion and arranging the conductor portion in the hollowed-out portion. Therefore, in each of these layers, the element body portion 11 and the conductor portion are flush with each other.

[0026] The conductor portion is made of, for example, a metal material. The material of the metal material is not particularly limited, but examples thereof include Ag, Cu, Au, Al, Pd, and Pd / Ag alloys. The metal material may contain a Ti compound, a Zr compound, or a Si compound. Laser processing, for example, can be used to hollow out the element portion 11. The conductor portion can be formed by, for example, a printing method or a thin film growth method.

[0027] The first conductor pattern layer L1 and the second conductor pattern layer L2 are layers that form the outer winding body C1 and the inner winding body C2, which are the main parts of the coil section C. In this embodiment, the first conductor pattern layers L1A, L1B and one second conductor pattern layer L2 are laminated in this order to form one set, and multiple sets are provided in the laminate structure according to the number of windings required in the coil section C. In the example of FIG. 3, the first conductor pattern layers L1A, L1B are laminated on the lower layer side of the multiple sets (the end surface 2a side of the element body 2), and a through-hole layer L4a and a fourth conductor pattern layer L4 are further laminated on the lower layer side of the first conductor pattern layer L1B.

[0028] As shown in FIGS. 4(a) and 4(b), the first conductor pattern layers L1A, L1B have annular outer conductor lines 12 and inner conductor lines 13. The outer conductor lines 12 are arranged in a rectangular annular shape that is slightly smaller than the outer shape of the first conductor pattern layer L1, and the inner conductor lines 13 are arranged in a rectangular annular shape that is even smaller than the outer conductor lines 12. The widths of the outer conductor lines 12 and the inner conductor lines 13 are approximately the same. The outer conductor lines 12 and the inner conductor lines 13 are spaced apart by a distance that is smaller than the widths of these lines. By reducing the distance between the outer conductor lines 12 and the inner conductor lines 13, a sufficient inner diameter is ensured for the outer winding body C1 and the inner winding body C2.

[0029] The outer conductor line 12 and the inner conductor line 13 are partially separated at a predetermined separation region R. The separation region R is, for example, ¼ or less of the length of one turn of the outer conductor line 12 and the inner conductor line 13, and is generally C-shaped in plan view. In the example of FIGS. 4(a) and 4(b), the separation region R is located near one long side surface of the first conductor pattern layer L1 in plan view (the end surface on the near side of the paper in FIG. 1). The outer conductor line 12 has a pair of end portions 12a, 12b facing each other across the separation region R. Similarly, the inner conductor line 13 has a pair of end portions 13a, 13b facing each other across the separation region R. In both of the first conductor pattern layers L1A and L1B, the distance between the pair of end portions 12a, 12b and the distance between the pair of end portions 12a, 12b are equal to each other.

[0030] On the other hand, the positions of the end pairs 12a, 12b of the outer conductor line 12 and the end pairs 13a, 13b of the inner conductor line 13 are offset within the plane of the same layer in the line direction of the coil portion C passing through the dividing region R (here, the opposing direction of the end faces 2c, 2d of the element body 2). In the first conductor pattern layer L1A, the positions of the end pairs 12a, 12b are offset from the center toward the end face 2c of the element body 2, and the positions of the end pairs 13a, 13b are offset from the center toward the end face 2d of the element body 2 (see FIG. 4(a)). In the first conductor pattern layer L1B, the positions of the end pairs 12a, 12b are offset from the center toward the end face 2d of the element body 2, and the positions of the end pairs 13a, 13b are offset from the center toward the end face 2c of the element body 2 (see FIG. 4(b)).

[0031] The second conductor pattern layer L2 is a layer that connects the outer conductor lines 12, 12 and the inner conductor lines 13, 13 of the first conductor pattern layer L1 that are adjacent in the stacking direction in a stepped manner. As shown in FIG. 4(c), the second conductor pattern layer L2 has an outer connection line 14 and an inner connection line 15. The outer connection line 14 and the inner connection line 15 are both linear and arranged corresponding to the separation region R. In the example of FIG. 4(c), the positions of both ends 14a, 14b of the outer connection line 14 and both ends 15a, 15b of the inner connection line 15 are aligned in the line direction of the coil portion C that passes through the separation region R.

[0032] The length of the outer connection line 14 is greater than the distance between the end 12a of the outer conductor line 12 of the first conductor pattern layer L1A and the end 12b of the outer conductor line 12 of the second conductor pattern layer L2B in plan view. The length of the inner connection line 15 is greater than the distance between the end 13a of the inner conductor line 13 of the first conductor pattern layer L1A and the end 13b of the inner conductor line 13 of the second conductor pattern layer L2B in plan view.

[0033] 5(a), in the stacked state of the first conductor pattern layer L1A, the first conductor pattern layer L1B, and the second conductor pattern layer L2, the outer conductor lines 12, 12 of one set of the first conductor pattern layer L1A and the second conductor pattern layer L2B overlap with each other in the stacking direction. The end 14a of the outer connection line 14 overlaps with the end 12a of the outer conductor line 12 of one set of the first conductor pattern layer L1A, and the end 14b of the outer connection line 14 overlaps with the end 12b of the outer conductor line 12 of the first conductor pattern layer L1B of the set adjacent to the one set in the stacking direction. As a result, the outer conductor lines 12, 12 of one set and the outer conductor lines 12, 12 of the other set are connected in a stepped manner by the outer connection line 14, forming an outer winding body C1 that winds from the end face 2a side of the element body 2 toward the end face 2b side.

[0034] 5(b), in the stacked state of the first conductor pattern layer L1A, the first conductor pattern layer L1B, and the second conductor pattern layer L2, the inner conductor lines 13, 13 of one set of the first conductor pattern layer L1A and the second conductor pattern layer L2B overlap with each other in the stacking direction. The end 15a of the inner connection line 15 overlaps with the end 13a of the inner conductor line 13 of one set of the first conductor pattern layer L1A, and the end 15b of the inner connection line 15 overlaps with the end 13b of the inner conductor line 13 of the first conductor pattern layer L1B of the set adjacent to the one set in the stacking direction. As a result, the inner conductor lines 13, 13 of one set and the inner conductor lines 13, 13 of the other set are connected in a stepped manner by the inner connection line 15, forming an inner winding body C2 that winds from the end face 2b side of the element body 2 toward the end face 2c side.

[0035] 5(a) and 5(b), the thickness of the second conductor pattern layer L2 is smaller than the thickness of the first conductor pattern layers L1A and L1B. The ratio of the thickness of the second conductor pattern layer L2 to the thickness of the first conductor pattern layers L1A and L1B is not particularly limited, but can be, for example, 1 / 2 or less. The thickness of the first conductor pattern layer L1A and the thickness of the first conductor pattern layer L1B may be the same or different.

[0036] The third conductor pattern layer L3 is a layer that connects the outer winding body C1 and the inner winding body C2. As shown in FIG. 3, the third conductor pattern layer L3 has a connection line 16 that connects the outer conductor line 12 and the inner conductor line 13. In the example of FIG. 3, the third conductor pattern layer L3 is laminated between the cover layer Lc and the first conductor pattern layer L1A of the set closest to the end face 2b of the element body 2. The connection line 16 extends obliquely at a position corresponding to the separation region R and connects the end 14b of the outer connection line 14 and the end 15a of the inner connection line 15 in the first conductor pattern layer L1A of the set closest to the end face 2b of the element body 2.

[0037] The fourth conductor pattern layer L4 is a layer that connects the coil portion C and the terminal electrodes 3, 3. As shown in FIG. 3, the fourth conductor pattern layer L4 is stacked closest to the end face 2a of the element body 2 via a through-hole layer L4a having through-holes 17A, 17B. The fourth conductor pattern layer L4 has a pair of lead conductors 18A, 18B. In the example of FIG. 3, the lead conductors 18A, 18B are both rectangular in plan view. The lead conductor 18A is arranged on the end face 2c side of the element body 2 and is connected to one of the terminal electrodes 3. The lead conductor 18A is connected via the through-hole 17A to the outer conductor line 12 of the first conductor pattern layer L1B, which is located closest to the end face 2a of the element body 2. The lead conductor 18B is arranged on the end face 2c side of the element body 2 and is connected to the other terminal electrode 3. The lead conductor 18B is connected to the inner conductor line 13 of the first conductor pattern layer L1B located closest to the end face 2a of the element body 2 via a through hole 17B.

[0038] In this embodiment, in each of the above-mentioned layers, a high resistivity region 20 having a higher resistivity than other regions is provided in a part of the element body portion 11. Here, resistivity refers to electrical resistivity. The resistivity in the element body portion 11 can be adjusted, for example, by adjusting the particle size of the metal magnetic particles contained in the element body 2. For example, by making the average particle size of the metal magnetic particles smaller than the average particle size of the metal magnetic particles in other regions, the high resistivity region 20 can be arranged in a desired region.

[0039] In the first conductor pattern layer L1, the resistivity of the region between the outer conductor lines 12 and the inner conductor lines 13 is higher than the resistivity of a central region P of the first conductor pattern layer L1. Here, the central region P is a rectangular region located inside the inner conductor lines 13 and slightly smaller than the inner conductor lines 13. In the example of FIG. 3 , in both of the first conductor pattern layers L1A and L1B, high resistivity regions 20 are arranged to surround the outer conductor lines 12 and the inner conductor lines 13, excluding the central region P. As a result, the regions outside the outer conductor lines 12, the region between the outer conductor lines 12 and the inner conductor lines 13, and the region between the inner conductor lines 13 and the central region P, together with the dividing region R, form high resistivity regions 20.

[0040] In the second conductor pattern layer L2, high resistivity regions 20 are arranged throughout the entire area except for the central region P. In plan view, the high resistivity regions 20 of the second conductor pattern layer L2 overlap with the high resistivity regions 20 of the first conductor pattern layer L1, and the high resistivity regions 20 also surround the outer connection lines 14 and the inner connection lines 15 located in the separation region R. In addition, the high resistivity regions 20 of the second conductor pattern layer L2 are also arranged between the outer conductor lines 12, 12 and the inner conductor lines 13, 13 of the first conductor pattern layer L1 that are adjacent in the stacking direction (see FIG. 5).

[0041] As described above, in the laminated coil component 1, the outer conductor lines 12, 12 and the inner conductor lines 13, 13 of the first conductor pattern layers L1 adjacent to each other in the stacking direction are connected to each other, thereby forming a coil section C with a multiple winding structure within the element body 2. The use of such a coil section C with a multiple winding structure improves winding efficiency. In the laminated coil component 1, the outer conductor lines 12, 12 and the inner conductor lines 13, 13 are connected to each other in a stepped manner by the outer connection lines 14 and the inner connection lines 15 located in the separation regions R of the outer conductor lines 12 and the inner conductor lines 13. This makes it possible to ensure a sufficient inner diameter of the coil section C, thereby improving characteristics such as the inductance value, DC superposition characteristics, and DC resistance. Furthermore, in the laminated coil component 1, the number of conductor patterns required to form the coil section C can be reduced, thereby avoiding the time and effort required to fabricate each layer.

[0042] Furthermore, in the laminated coil component 1, the positions of the two ends 14a, 14b of the outer connection line 14 and the two ends 15a, 15b of the inner connection line 15 in the dividing region R are aligned in the linear direction of the coil portion C passing through the dividing region, while the positions of the pair of ends 12a, 12a of the outer conductor line 12 and the pair of ends 13a, 13b of the inner conductor line 13 facing each other across the dividing region R are offset in the linear direction of the coil portion C passing through the dividing region R. This makes it possible to reduce the length of the region where the outer conductor line 12 and the inner conductor line 13 are parallel to each other. A voltage is more likely to be applied to the region where the outer conductor line 12 and the inner conductor line 13 are parallel to each other than to other portions. Therefore, reducing the length of this region makes it possible to preferably improve the withstand voltage.

[0043] In the laminated coil component 1, the resistivity of the region between the outer conductor lines 12 and the inner conductor lines 13 in the first conductor pattern layer L1 may be higher than the resistivity of the central region P of the first conductor pattern layer L1. The region between the outer conductor lines 12 and the inner conductor lines 13 is more susceptible to voltage than other regions. Therefore, by relatively increasing the resistivity of this region, the withstand voltage can be further improved.

[0044] In the laminated coil component 1, in the second conductor pattern layer L2, the resistivity of the regions between the outer conductor lines 12, 12 and between the inner conductor lines 13, 13 of the first conductor pattern layer L1 adjacent in the stacking direction is higher than the resistivity of the central region P of the second conductor pattern layer L2. The regions between the outer conductor lines 12, 12 and between the inner conductor lines 13, 13 of the first conductor pattern layer L1 adjacent in the stacking direction are more susceptible to voltage than other regions. Therefore, by relatively increasing the resistivity of these regions, the withstand voltage can be further improved.

[0045] In the laminated coil component 1, the thickness of the second conductor pattern layer L2 is smaller than the thickness of the first conductor pattern layer L1. This reduces the thickness of the connection portions of the outer conductor lines 12 and the inner conductor lines 13 (in the example of FIGS. 5(a) and 5(b), the thickness of the overlapping portions between the ends 12a and 12b of the outer conductor line 12 and the ends 14a and 14b of the outer connection line 14, and the thickness of the overlapping portions between the ends 13a and 13b of the inner conductor line 13 and the ends 15a and 15b of the inner connection line 15), allowing the coil section C to be wound more densely in the stacking direction. Furthermore, reducing the thickness of the connection portions can reduce thermal contraction of the connection portions and thickness variations due to thermal contraction. This can therefore reduce the occurrence of disconnections at the connection portions.

[0046] In the laminated coil component 1, a pair of terminal electrodes 3, 3 is provided on an end surface 2a in the lamination direction of the element body 2. The coil portion C also has a fourth conductor pattern layer L4 having lead conductors 18A, 18B that connect an outer conductor line 12 to one of the pair of terminal electrodes 3, 3 and connect an inner conductor line 13 to the other of the pair of terminal electrodes 3, 3. This allows for the configuration of a so-called bottom terminal type laminated coil component. A bottom terminal type laminated coil component can reduce the mounting area and achieve high-density mounting.

[0047] In the laminated coil component 1, the third conductor pattern layer L3 connects the outer conductor lines 12 and the inner conductor lines 13 on the side of the end face 2b in the lamination direction of the element body 2. This ensures a sufficient number of turns of the coil portion C.

[0048] 6 , the positions of the pair of ends 12a, 12a of the outer conductor line 12 and the pair of ends 13a, 13b of the inner conductor line 13, which face each other across the dividing region R, may be aligned in the linear direction of the coil portion C passing through the dividing region R, and the positions of both ends 14a, 14b of the outer connection line 14 and both ends 15a, 15b of the inner connection line 15 in the dividing region R may be offset in the linear direction of the coil portion C passing through the dividing region R.

[0049] 6, one first conductor pattern layer L1 and a pair of second conductor pattern layers L2A, L2B are laminated in this order to form a set, with multiple sets provided in the laminate structure according to the number of windings required in the coil section C. In the first conductor pattern layer L1, as shown in FIG. 7(a), the positions of the pair of ends 12a, 12b of the outer conductor line 12 and the position of the pair of ends 13a, 13b of the inner conductor line 13 are both symmetrical across the center.

[0050] 7(a) and 7(b), the outer connection lines 14 and inner connection lines 15 of the second conductor pattern layer L2A and the outer connection lines 14 and inner connection lines 15 of the second conductor pattern layer L2B are arranged alternately in a plan view. That is, in the second conductor pattern layer L2A, the outer connection lines 14 are located more eccentrically toward the end face 2c of the element body 2 than the center, and the inner connection lines 15 are located more eccentrically toward the end face 2d of the element body 2 than the center. In addition, in the second conductor pattern layer L2B, the outer connection lines 14 are located more eccentrically toward the end face 2d of the element body 2 than the center, and the inner connection lines 15 are located more eccentrically toward the end face 2c of the element body 2 than the center.

[0051] 8(a), in the stacked state of the first conductor pattern layer L1 and the second conductor pattern layers L2A and L2B, the end 14b of the outer connection line 14 of the second conductor pattern layer L2A and the end 14a of the outer connection line 14 of the second conductor pattern layer L2B overlap in the stacking direction. The end 14a of the outer connection line 14 of the second conductor pattern layer L2A overlaps with the end 12a of the outer conductor line 12 of one set of first conductor pattern layers L1, and the end 14bb of the outer connection line 14 of the second conductor pattern layer L2B overlaps with the end 12b of the outer conductor line 12 of the first conductor pattern layer L1 of the set adjacent to the one set in the stacking direction.

[0052] 8(b), in the stacked state of the first conductor pattern layer L1 and the second conductor pattern layers L2A and L2B, the end 15a of the inner connecting line 15 of the second conductor pattern layer L2A and the end 15b of the inner connecting line 15 of the second conductor pattern layer L2B overlap in the stacking direction. The end 15b of the inner connecting line 15 of the second conductor pattern layer L2A overlaps with the end 13b of the inner conductor line 13 of one set of first conductor pattern layers L1, and the end 15a of the inner connecting line 15 of the second conductor pattern layer L2B overlaps with the end 13a of the inner conductor line 13 of the first conductor pattern layer L1 of the set adjacent to the one set in the stacking direction.

[0053] In the above embodiment, a bottom terminal type laminated coil component 1 in which a pair of terminal electrodes 3, 3 is provided on the end surface 2a of the element body 2 in the stacking direction has been exemplified, but as shown in Fig. 9, an end terminal type laminated coil component 21 in which terminal electrodes 3 are provided on both longitudinal end surfaces 2a, 2b of the element body 2, respectively, may also be used. When the layer configuration shown in Fig. 3 is applied to the end terminal type, for example, as shown in Fig. 10, instead of the through hole layer L4a having the through holes 17A, 17B and the fourth conductor pattern layer L4, a pair of fourth conductor pattern layers L4A, L4B and a plurality of cover layers Lc may be laminated on the lower layer side of the first conductor pattern layers L1A, L1B on the lower layer side of the plurality of sets (the end surface 2a side of the element body 2).

[0054] The fourth conductor pattern layer L4A has a lead conductor 21A and a through hole 22. The lead conductor 21A has a rectangular shape in a plan view and is arranged on the end face 2c side of the element body 2. The lead conductor 21A is connected to the outer conductor line 12 of the first conductor pattern layer L1B located closest to the end face 2a of the element body 2 and one of the terminal electrodes 3 provided on the end face 2c side. The through hole 22 is arranged at a distance from the lead conductor 21A on the end face 2d side of the element body 2 and is connected to the inner conductor line 13 of the first conductor pattern layer L1B located closest to the end face 2a of the element body 2. In the example of FIG. 10 , the element body portion 11 of the fourth conductor pattern layer L4A, except for the central region P, is a high resistivity region 20. As a result, the lead conductor 18A and the through hole 17 are both surrounded by the high resistivity region 20.

[0055] The fourth conductor pattern layer L4B has a lead conductor 21B. The lead conductor 21B has a rectangular shape in a plan view and is arranged on the end face 2d side of the element body 2. The lead conductor 21B connects, via a through hole 22 in the fourth conductor pattern layer L4A, the inner conductor line 13 of the first conductor pattern layer L1B, which is located closest to the end face 2a of the element body 2, to the other terminal electrode 3 provided on the end face 2d side.

[0056] The same applies when the layer configuration of Figure 6 is applied to an end face terminal type. For example, as shown in Figure 11, instead of the layer L4a having through holes 17A, 17B and the fourth conductor pattern layer L4, a pair of fourth conductor pattern layers L4A, 4B and multiple cover layers Lc shown in Figure 10 can be laminated on the lower layer side of the first conductor pattern layer L1 on the lower layer side of multiple sets (the end face 2a side of the base body 2).

[0057] The high resistivity region 20 does not necessarily have to be provided. That is, the resistivity of the element body portion 11 constituting each layer may be constant. In this case, the configuration can be simplified. [Explanation of symbols]

[0058] 1, 21... multilayer coil component, 2... element body, 2a... end face (one end face), 2b... end face (other end face), 3... terminal electrode, 12... outer conductor line, 12a, 12b... end pair, 13... inner conductor line, 13a, 13b... end pair, 14... outer connecting line, 14a, 14b... both ends, 15... inner connecting line, 15a, 15b... both ends, 16... connecting line, C... coil portion, L1 (L1A, L1B)... first conductor pattern layer, L2 (L2A, L2B)... second conductor pattern layer, L3... third conductor pattern layer, R... dividing region.

Claims

1. A laminated coil component having a coil portion inside an insulating body forming a laminated structure, The aforementioned coil section is A first conductor pattern layer having an annular outer conductor line and an inner conductor line that are partially divided in a predetermined division region, A second conductor pattern layer having outer connecting lines that connect the outer conductor lines of adjacent first conductor pattern layers in the stacking direction in the divided region, and inner connecting lines that connect the inner conductor lines of adjacent first conductor pattern layers in the stacking direction in the divided region, A third conductor pattern layer having connecting lines connecting the outer conductor line and the inner conductor line, The positions of the end pairs of the outer conductor lines and the end pairs of the inner conductor lines facing each other across the divided region, or the positions of both ends of the outer connecting line and both ends of the inner connecting line in the divided region, are offset in the line direction of the coil portion passing through the divided region. The outer connection line and the inner connection line have overlapping portions when viewed from a direction intersecting the line direction within the plane of the second conductor pattern layer.

2. The second conductor pattern layer is rectangular in shape, having a pair of short sides and a pair of long sides that face each other. The laminated coil component according to claim 1, wherein the outer connection line and the inner connection line extend along one of the pair of long sides.

3. The positions of both ends of the outer connection line and both ends of the inner connection line in the divided region are aligned with respect to the line direction of the coil portion passing through the divided region. The laminated coil component according to claim 1 or 2, wherein the positions of the end pair of the outer conductor line and the end pair of the inner conductor line facing each other across the divided region are offset in the line direction of the coil portion passing through the divided region.

4. The laminated coil component according to any one of claims 1 to 3, wherein in the first conductor pattern layer, the resistivity of the region between the outer conductor line and the inner conductor line is higher than the resistivity of the central region of the first conductor pattern layer.

5. The laminated coil component according to any one of claims 1 to 4, wherein in the second conductor pattern layer, the resistivity of the regions between the outer conductor lines and the inner conductor lines of the first conductor pattern layer adjacent to each other in the lamination direction is higher than the resistivity of the central region of the second conductor pattern layer.

6. The laminated coil component according to any one of claims 1 to 5, wherein the thickness of the second conductor pattern layer is smaller than the thickness of the first conductor pattern layer.

7. A pair of terminal electrodes is provided on one end face in the stacking direction of the aforementioned substrate. The laminated coil component according to any one of claims 1 to 6, wherein the coil portion has a fourth conductor pattern layer having a lead conductor that connects the outer conductor line to one of the pair of terminal electrodes and the inner conductor line to the other of the pair of terminal electrodes.

8. The laminated coil component according to claim 7, wherein the third conductor pattern layer connects the outer conductor line and the inner conductor line on the other end face side in the lamination direction of the base body.

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