Laminated coil component and method for manufacturing the same

Abstract

To provide a laminated coil component which is easily changed in design to have a different inductance value, and to provide a method of manufacturing the same.SOLUTION: In the multilayer coil component 1, the magnetic-path length L of the coil conductors 5 changes depending on the positions of the second wiring portions 6 and the first wiring portions 7 in the second direction D2, and the inductance value changes accordingly. At this time, since the wide pillar portion 8 is included in the plurality of pairs of pillar portions 8, the positions of the second wire portion 6 and the first wire portion 7 with respect to the D2 portion in the second direction can be changed in the range connected to the wide pillar portion 8 without changing the design of the plurality of pairs of pillar portions 8. Therefore, in the multilayer coil component 1, it is easy to change the design to make the inductance value different.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a laminated coil component and a method for manufacturing the same. [Background technology]

[0002] Known conventional multilayer coil components include, for example, the one described in Patent Document 1. The multilayer coil component described in this document includes an element body having a mounting surface and a main surface that face each other in the stacking direction, a coil conductor that is disposed within the element body and has a coil axis that is parallel to the mounting surface, and a pair of terminal electrodes that are disposed on the mounting surface of the element body and are electrically connected to a pair of ends of the coil conductor, respectively. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-141945 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to manufacture multiple types of laminated coil components with different inductance values ​​according to the above-mentioned conventional technology, it was necessary to redesign the entire component for each type of inductance value. The inventors have discovered a new technology that makes it easy to make design changes to vary the inductance values ​​of laminated coil components.

[0005] An object of one aspect of the present invention is to provide a laminated coil component that allows easy design changes to change the inductance value, and a method for manufacturing the same. [Means for solving the problem]

[0006] A laminated coil component according to one aspect of the present invention is comprised of a plurality of laminated insulating layers, and includes: an element body having a mounting surface that intersects with a stacking direction, a pair of end faces that face each other in a first direction parallel to the mounting surface, and a pair of side faces that face each other in a second direction that is orthogonal to the stacking direction and the first direction; a coil conductor that is provided within the element body and has a coil axis that extends along the second direction and has both ends extended to the mounting surface; and a pair of terminal electrodes that are provided on the mounting surface of the element body and are connected to both ends of the coil conductor, respectively. The coil conductor includes a plurality of first wiring portions that extend parallel to the mounting surface and are arranged in parallel along the second direction, and a plurality of terminal electrodes that are connected to both ends of the coil conductor. the second wiring portion extending parallel to the mounting surface and along the first direction on the side farther from the mounting surface and arranged in parallel along the second direction; a plurality of pairs of pillar portions extending along the stacking direction to connect the first wiring portion and the second wiring portion and arranged in two rows along the second direction; and a pair of lead-out conductors extending from two of the plurality of pairs of pillar portions located at the ends of the rows to the mounting surface and constituting both ends of a coil conductor connected to a pair of terminal electrodes, respectively, wherein at least one of the two pillar portions located at the ends of the row of the plurality of pairs of pillar portions and connected to the first wiring portion is a wide pillar portion whose length in the second direction is longer than that of the first wiring portion.

[0007] In the above-mentioned laminated coil component, the magnetic path length of the coil conductor changes depending on the positions of the first wiring portion and the second wiring portion in the second direction, thereby changing the inductance value. Since the wide pillar portion is included in the plurality of pairs of pillar portions, the positions of the first wiring portion and the second wiring portion in the second direction can be changed within the range where they are connected to the wide pillar portion without changing the design of the plurality of pairs of pillar portions. Therefore, the above-mentioned laminated coil component facilitates design changes that change the inductance value.

[0008] A method for manufacturing a laminated coil component according to one aspect of the present invention includes a first step of preparing a first element body layer including a plurality of lower wiring portions extending along a first direction within the layer and arranged in parallel along a second direction within the layer that is perpendicular to the first direction; a second step of stacking at least one second element body layer on the first element body layer, the second element body layer including a plurality of pairs of pillar conductors arranged in two rows along the second direction and provided at positions corresponding to the plurality of lower wiring portions; and a third step of stacking a third element body layer on the second element body layer, the third element body layer including at least one upper wiring portion connecting the pillar conductors of the second element body layer and a pair of first lead conductors provided at positions corresponding to the pillar conductor. and a fourth step of stacking a fourth element body layer on the third element body layer, the fourth element body layer including a pair of second extraction conductors connected to the pair of first extraction conductors, respectively; and a fifth step of providing a fifth element body layer on the fourth element body layer, the fifth element body layer having a pair of terminal electrodes connected to the pair of second extraction conductors, respectively, and arranged along the first direction, wherein at least one of the pillar elements located at the end of the row and connected to the first wiring element is a wide pillar element whose length in the second direction is longer than that of the first wiring element, and the first and third steps determine the positions of the lower wiring element and the upper wiring element in the second direction within the range where they are connected to the wide pillar element.

[0009] In the manufacturing method of the above-mentioned laminated coil component, in the first step and the third step, the positions of the lower wiring portion and the upper wiring portion in the second direction are determined within the range where they are connected to the wide pillar portion, and the magnetic path length of the coil conductor changes depending on the positions of the lower wiring portion and the upper wiring portion in the second direction, thereby changing the inductance value. Because the wide pillar portion is included in multiple pairs of pillar portions, the inductance value can be adjusted in the first step and the third step while remaining the same in the second step. Therefore, the manufacturing method of the above-mentioned laminated coil component facilitates design changes that change the inductance value. [Effects of the Invention]

[0010] According to one aspect of the present invention, there is provided a laminated coil component that allows easy design changes to be made to change the inductance value, and a method for manufacturing the same. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a laminated coil component according to one embodiment. [Figure 2] FIG. 2 is an exploded perspective view showing the configuration of each layer of the laminated coil component shown in FIG. [Figure 3] 3 is a diagram showing the configuration of a wiring section of the first element body layer shown in FIG. 2. FIG. [Figure 4] 3 is a diagram showing the configuration of a wiring section of the second element layer shown in FIG. 2. FIG. [Figure 5] 3 is a diagram showing the configuration of a wiring section of the third element layer shown in FIG. 2. FIG. [Figure 6] 3 is a diagram showing the configuration of a wiring section of a fourth element layer shown in FIG. 2. FIG. [Figure 7] 3 is a diagram showing the configuration of a wiring section of the fifth element layer shown in FIG. 2. FIG. [Figure 8] 2 is a flowchart showing the steps of a method for manufacturing the laminated coil component shown in FIG. [Figure 9] FIG. 2 is a side view of the laminated coil component shown in FIG. [Figure 10] FIG. 2 is a perspective view showing the coil conductor shown in FIG. [Figure 11] FIG. 10 is a diagram showing a wiring section of the first element body layer having a different configuration. [Figure 12] FIG. 10 is a diagram showing a wiring section of a third element layer having a different configuration. [Figure 13] 10A and 10B are perspective views showing coil conductors with different configurations. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and redundant description will be omitted.

[0013] The laminated coil component according to the present embodiment will be described with reference to Fig. 1. Fig. 1 is a perspective view of the laminated coil component according to one embodiment. As shown in Fig. 1, the laminated coil component 1 includes an element body 2, a pair of bottom electrodes 3 and 4, and a coil conductor 5.

[0014] The element body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and ridges, and a rectangular parallelepiped shape with rounded corners and ridges. The element body 2 has, as its outer surfaces, a pair of end faces 2a and 2b, a pair of main faces 2c and 2d, and a pair of side faces 2e and 2f. The end faces 2a and 2b face each other. The main faces 2c and 2d face each other. The side faces 2e and 2f face each other. Hereinafter, the facing direction of the end faces 2a and 2b is referred to as a first direction D1, the facing direction of the side faces 2e and 2f is referred to as a second direction D2, and the facing direction of the main faces 2c and 2d is referred to as a third direction D3. The first direction D1, the third direction D3, and the second direction D2 are approximately perpendicular to each other.

[0015] The end faces 2a and 2b extend in the third direction D3 to connect the principal faces 2c and 2d. The end faces 2a and 2b also extend in the second direction D2 to connect the side faces 2e and 2f. The principal faces 2c and 2d extend in the first direction D1 to connect the end faces 2a and 2b. The principal faces 2c and 2d also extend in the second direction D2 to connect the side faces 2e and 2f. The side faces 2e and 2f extend in the first direction D1 to connect the end faces 2a and 2b. The side faces 2e and 2f also extend in the third direction D3 to connect the principal faces 2c and 2d.

[0016] The main surface 2d is a mounting surface of the element body 2, and is the surface that faces another electronic device (not shown) when the laminated coil component 1 is mounted on the other electronic device (for example, a circuit board or a laminated electronic component). The end surfaces 2a and 2b are surfaces that are continuous with the mounting surface (i.e., the main surface 2d).

[0017] The length of the element body 2 in the first direction D1 is longer than the length of the element body 2 in the third direction D3 and the length of the element body 2 in the second direction D2. The length of the element body 2 in the third direction D3 is shorter than the length of the element body 2 in the second direction D2. That is, in this embodiment, the end faces 2a, 2b, main faces 2c, 2d, and side faces 2e, 2f have a rectangular shape. The length of the element body 2 in the third direction D3 may be equal to the length of the element body 2 in the second direction D2, or may be longer than the length of the element body 2 in the second direction D2.

[0018] In this embodiment, "equivalent" does not only mean equal, but also may mean values ​​that include slight differences or manufacturing errors within a preset range. For example, if multiple values ​​are within a range of ±5% of the average value of the multiple values, the multiple values ​​are defined as equivalent.

[0019] As shown in Figure 2, the element body 2 has a configuration in which multiple element body layers are stacked in the third direction D3, and in this embodiment, the element body 2 is composed of nine element body layers 21 to 29. In other words, the stacking direction of the element body 2 coincides with the third direction D3. Wiring portions 6, 7, 8a to 8f that constitute the coil conductor 5, which will be described later, are embedded in the element body layers 22 to 28. The element body 2 can be produced by sequentially stacking the element body layers 22 to 29 on the element body layer 21, as will be described in the manufacturing method below. In an actual element body 2, the multiple element body layers 21 to 29 may be integrated to the extent that the boundaries between the layers are not visible, or may be integrated so that the boundaries between the layers are visible.

[0020] Each of the element layers 21-29 is mainly made of an insulating material, such as a resin material. The resin material includes at least one selected from the group consisting of liquid crystal polymer, polyimide resin, crystalline polystyrene, epoxy resin, acrylic resin, bismaleimide resin, and fluorine resin. The resin material may or may not include a filler. The filler may be, for example, an inorganic filler. Examples of the inorganic filler include silica. Each of the element layers 21-29 may be made of a magnetic material. Examples of the magnetic material include a Ni-Cu-Zn ferrite material, a Ni-Cu-Zn-Mg ferrite material, or a Ni-Cu ferrite material. The magnetic material may include an Fe alloy. Each of the element layers 21-29 may also include a non-magnetic material, which may be a glass ceramic material or a dielectric material. Each of the wiring portions 6, 7, 8a-8f is made of a conductive material (for example, Cu).

[0021] The element body layer 21 is made of only the above insulating material. The element body layer 21 is located at the bottom of the element body 2 and forms the main surface 2c.

[0022] As shown in FIGS. 2 and 3 , multiple second wiring portions 6 (lower wiring portions) are embedded in the element body layer 22, and the element body layer 22 according to this embodiment includes three second wiring portions 6. The multiple second wiring portions 6 all extend parallel to one another in the first direction D1 and have the same length in the first direction D1. The multiple second wiring portions 6 all have a length W1 in the second direction D2 and are arranged at equal intervals in the second direction D2. The multiple second wiring portions 6 are disposed spaced apart from the end faces 2a, 2b and side faces 2e, 2f of the element body 2. One end 6a of each second wiring portion 6 in the extension direction is located near the end face 2a, and the other end 6b is located near the end face 2b. The multiple second wiring portions 6 are located on the main surface 2c side of the element body 2 because the element body layer 22 is stacked directly on the element body layer 21 that constitutes the main surface 2c. The element layer 22 is also referred to as a first element layer in the following description.

[0023] 2 and 4, wiring portions 8a to 8d (pillar conductors) that form pillar portions 8 extending along the third direction D3 are embedded in the element layers 23 to 26. The wiring portions 8a to 8d are provided in the same positions in all of the element layers 23 to 26 and overlap one another in the third direction D3. The element layers 23 to 26 are also referred to as second element layers in the following description.

[0024] Each of the wiring portions 8a to 8d is configured in a plurality of pairs in the first direction D1, and in this embodiment, three pairs are configured. Specifically, each of the wiring portions 8a to 8d is aligned in two rows along the second direction D2. In the following description, the row of the two aligned wiring portions 8a to 8d on the end face 2a side will also be referred to as the first row 8A, and the row on the end face 2b side will also be referred to as the second row 8B.

[0025] Each pair of the first wiring portion 8a-8d in the first row 8A counting from the side surface 2f and the first wiring portion 8a-8d in the second row 8B counting from the side surface 2f is a wide wiring portion (wide pillar conductor) having a rectangular shape extending in the second direction D2 and a length W2 in the second direction D2. In this embodiment, the length W2 is at least twice the length W1. The length W2 in the second direction D2 of the wiring portions 8a-8d is longer than the length W1 in the second direction D2 of the second wiring portion 6. Each pair of the second wiring portion 8a-8d in the first row 8A counting from the side surface 2f and the second wiring portion 8a-8d in the second row 8B counting from the side surface 2f is a square shape and has a length W1 in the second direction D2. The pair of the third wiring portion 8a-8d counting from the side surface 2f in the first row 8A and the third wiring portion 8a-8d counting from the side surface 2f in the second row 8B each has a rectangular shape extending in the second direction D2 and is a wide wiring portion (wide pillar conductor) having a length W2 in the second direction D2.

[0026] As shown in FIGS. 2 and 5 , multiple first wiring portions 7 are embedded in the element body layer 27. In this embodiment, the element body layer 27 includes two first wiring portions 7. Each first wiring portion 7 has a pair of end portions 7a, 7b and a sloped portion 7c interposed between the pair of end portions 7a, 7b. The pair of end portions 7a, 7b and the sloped portion 7c are configured to be continuous, with the pair of end portions 7a, 7b located on both sides of the sloped portion 7c in the first direction D1. The pair of end portions 7a, 7b consists of a first end portion 7a located closer to the end face 2a of the element body 2 and a second end portion 7b located closer to the end face 2b of the element body 2. The first end portion 7a and the second end portion 7b are offset from each other in the second direction D2 when viewed from the third direction D3. In this embodiment, the first end portion 7a is located closer to the side surface 2e than the second end portion 7b when viewed from the third direction D3. The inclined portion 7c extends in a direction inclined at a predetermined angle with respect to the first direction D1 and connects a pair of end portions 7a, 7b that are offset from each other in the second direction D2. Each of the pair of end portions 7a, 7b overlaps one of the wiring portions 8a-8d in the first row 8A and one of the wiring portions 8a-8d in the second row. The element body layer 27 is also referred to as the third element body layer in the following description.

[0027] In this embodiment, the second end 7b of the first wiring portion 7A of the two first wiring portions 7 overlaps with the first wiring portion 8a-8d of the wiring portions 8a-8d in the second row 8B, counting from the side surface 2f of the element body 2, and the second end 7b overlaps with the second wiring portion 8a-8d of the wiring portions 8a-8d in the first row 8A, counting from the side surface 2f of the element body 2. Similarly, the second end 7b of the first wiring portion 7B of the two first wiring portions 7 overlaps with the second wiring portion 8a-8d of the wiring portions 8a-8d in the second row 8B, counting from the side surface 2f of the element body 2, and the second end 7b overlaps with the second wiring portion 8a-8d of the wiring portions 8a-8d in the first row 8A, counting from the side surface 2f of the element body 2.

[0028] The wiring portions 8a to 8d overlapped by the second end portion 7b of the first wiring portion 7A have a rectangular shape extending in the second direction D2, and the second end portion 7b of the first wiring portion 7A also has the same shape (i.e., a rectangular shape extending in the second direction D2).Furthermore, the wiring portions 8a to 8d overlapped by the first end portion 7a of the first wiring portion 7B also have a rectangular shape extending in the second direction D2, and the first end portion 7a of the first wiring portion 7B also has the same shape (i.e., a rectangular shape extending in the second direction D2).

[0029] Furthermore, a pair of wiring portions 8e (first lead wiring portions) are embedded in the element layer 27. One of the pair of wiring portions 8e is provided at a position overlapping one of the wiring portions 8a to 8d in the first row 8A, and the other of the pair of wiring portions 8e is provided at a position overlapping one of the wiring portions 8a to 8d in the second row 8B. In this embodiment, one of the pair of wiring portions 8e overlaps with the first wiring portion 8a to 8d counting from the side surface 2f of the wiring portions 8a to 8d in the first row 8A, and constitutes the end portion 5a of the coil conductor 5. The other of the pair of wiring portions 8e overlaps with the third wiring portion 8a to 8d counting from the side surface 2f of the wiring portions 8a to 8d in the second row 8B, and constitutes the end portion 5b of the coil conductor 5.

[0030] The wiring portions 8a to 8d where a pair of wiring portions 8e overlap each other all have a rectangular shape extending in the second direction D2, and each wiring portion 8e also has the same shape (that is, a rectangular shape extending in the second direction D2).

[0031] As shown in FIGS. 2 and 6, a pair of wiring portions 8f (second lead wiring portions) are embedded in element body layer 28. The pair of wiring portions 8f are provided at positions overlapping the pair of wiring portions 8e of element body layer 27, respectively. Of the pair of wiring portions 8f, the wiring portions 8f on the end face 2a side and the side face 2f side constitute end portion 5a of coil conductor 5, and the wiring portions 8f on the end face 2b side and the side face 2e side constitute end portion 5b of coil conductor 5. In this embodiment, the length of wiring portion 8f in the second direction D2 is designed to be length W1, which is shorter than that of wiring portion 8e. The length of wiring portion 8f in the second direction D2 may be the same as length W2 of wiring portion 8e. In the following description, element body layer 28 will also be referred to as the fourth element body layer.

[0032] As shown in FIGS. 2 and 7 , element body layer 29 is provided with a pair of bottom electrodes 3, 4 (terminal electrodes). From the perspective of the manufacturing procedure, element body layer 29 is located at the top of element body 2 and constitutes main surface 2d. In other words, the pair of bottom electrodes 3, 4 are provided on main surface 2d of element body 2. In the following description, element body layer 29 will also be referred to as the fifth element body layer. The pair of bottom electrodes 3, 4 each have a rectangular shape when viewed from third direction D3. The pair of bottom electrodes 3, 4 may have the same shape and dimensions. The pair of bottom electrodes 3, 4 according to this embodiment are aligned in first direction D1, with the bottom electrode 3 located on the end face 2a side of element body 2 overlapping with the wiring portions 8f on the end face 2a and side face 2f sides of the pair of wiring portions 8f on element body layer 28, and the bottom electrode 4 located on the end face 2b side of element body 2 overlapping with the wiring portions 8f on the end face 2b and side face 2e sides of the pair of wiring portions 8f on element body layer 28. The pair of bottom electrodes 3, 4 are buried inside the element body 2 (more specifically, inside the element body layer 29) and are exposed from the main surface 2d. The pair of bottom electrodes 3, 4 may be provided partially or entirely on the main surface 2d of the element body 2.

[0033] The laminated coil component 1 can be produced by the manufacturing method shown in the flowchart of FIG.

[0034] First, in a first step S1, an element layer 21 and a first element layer 22 are prepared. In the first step S1, the first element layer 22 is laminated on the element layer 21. Alternatively, the first element layer 22 may be prepared by laminating it on the element layer 21 in advance.

[0035] Next, in second step S2, second element layers 23-26 are sequentially stacked on first element layer 22. If second element layers 23-26 are multiple layers, as in this embodiment, second step S2 is repeated multiple times. That is, if the number of second element layers is N, second step S2 is repeated N times. If the second element layer is a single layer, second step S2 is performed only once and does not need to be repeated.

[0036] Then, in a third step S3, a third element layer 27 is laminated on the second element layers 23-26 (more specifically, on the uppermost second element layer 26). Furthermore, in a fourth step S4, a fourth element layer 28 is laminated on the third element layer 27. Finally, in a fifth step S5, a fifth element layer 29 is laminated on the fourth element layer 28. The bottom electrodes 3 and 4 may be provided on the fifth element layer 29 before it is laminated, or may be provided on the fifth element layer 29 after it is laminated.

[0037] Next, the pillar portion 8 according to this embodiment will be described with reference to FIGS.

[0038] In this embodiment, the wiring portions 8a-8d of each element layer 23-26 are stacked to form six pillar portions 8. The pillar portions 8 are configured in pairs in the first direction D1, and in this embodiment, there are three pairs. Similar to the wiring portions 8a-8d, the three pairs of pillar portions 8 are aligned in two rows, a first row 8A and a second row 8B, along the second direction D2.

[0039] As shown in Fig. 9, each of the pillar portions 8 is connected to both end portions 6a, 6b of the second wiring portion 6. Specifically, one end portion (the end portion on the main surface 2c side) of one pillar portion 8 is connected to the end portion 6a of the second wiring portion 6, and one end portion of one pillar portion 8 is connected to the end portion 6b of the second wiring portion 6. Each of the pillar portions 8 extends from the second wiring portion 6 toward the main surface 2d of the element body 2. In other words, one second wiring portion 6 is bridged across two pillar portions 8. In this embodiment, the cross-sectional shape of the pillar portion 8 in a cross section perpendicular to the third direction D3 is quadrangular, such as a square or a rectangle.

[0040] In this embodiment, the first pillar portion 8, counting from the side surface 2f, of the pillar portions 8 in the first row 8A has one end connected to the end portion 6a of the first second wiring portion 6, counting from the side surface 2f, and the other end connected to the bottom electrode 3 provided on the main surface 2d via the wiring portions 8e, 8f that constitute the end portion 5a of the coil conductor 5. The second and third pillar portions 8, counting from the side surface 2f, of the pillar portions 8 in the first row 8A have one end connected to the ends 6a of the second and third second wiring portions 6, counting from the side surface 2f, respectively, and the other ends connected to the first ends 7a of the first and second first wiring portions 7, counting from the side surface 2f, respectively.

[0041] Furthermore, in this embodiment, the first and second pillar portions 8 counting from the side surface 2f of the pillar portions 8 in the second row 8B have one end connected to the end portions 6b of the first and second second wiring portions 6 counting from the side surface 2f, respectively, and the other end connected to the second end portions 7b of the first to fourth first wiring portions 7 counting from the side surface 2f, respectively. The third pillar portion 8 counting from the side surface 2f of the pillar portions 8 in the second row 8B has one end connected to the end portion 6b of the third second wiring portion 6 counting from the side surface 2f, and the other end connected to the bottom electrode 4 provided on the main surface 2d via the wiring portions 8e, 8f that form the end portion 5b of the coil conductor 5.

[0042] In this embodiment, the coil conductor 5 is composed of wiring portions 6, 7, 8a to 8f provided within the element body 2. In other words, the coil conductor 5 is composed of a plurality of second wiring portions 6, a plurality of pairs of pillar portions 8, and a plurality of first wiring portions 7. The coil conductor 5 has a coil axis along the second direction D2 and winds around the coil axis. The coil conductor 5 according to this embodiment winds around the coil axis by approximately 2.5 turns. One end 5a of the coil conductor 5 is connected to the bottom electrode 3, and the other end 5b is connected to the bottom electrode 4, so that the coil conductor functions as an inductor between the bottom electrodes 3 and 4.

[0043] Here, the inductance value of the laminated coil component 1 will be described.

[0044] The inductance value of the laminated coil component 1 varies depending on the magnetic path length L of the coil conductor 5 shown in Fig. 10, and the shorter the magnetic path length L, the larger the inductance value. That is, the inductance value of the laminated coil component 1 can be adjusted by changing the magnetic path length L of the coil conductor 5. The magnetic path length L of the coil conductor 5 can be changed by adjusting the design of the first base layer 22 in the first step S1 of the manufacturing method shown in Fig. 8, and can also be changed by adjusting the design of the base layer 27 in the third step S3.

[0045] For example, in the first step S1, the magnetic path length of the coil conductor 5 can be changed by changing the design of the second wiring portion 6 of the first base layer 22. Specifically, the magnetic path length of the coil conductor 5 can be changed by shortening or shortening the separation distance between adjacent second wiring portions 6 in the second direction D2. One method for changing the design of the second wiring portion 6 of the first base layer 22 is to prepare in advance multiple types of first base layers 22 that differ in the relative positions of the second wiring portions 6 in the second direction D2, and then select one type from the multiple types of first base layers 22 and stack it on the base layer 21. Alternatively, in the first step S1, a first base layer 22 including the desired second wiring portion 6 can be formed, and the formed first base layer 22 can be stacked on the base layer 21.

[0046] In the third step S3, the magnetic path length of the coil conductor 5 can be changed by modifying the design of the first wiring portion 7 of the third element layer 27. Specifically, the magnetic path length of the coil conductor 5 is changed by increasing or decreasing the separation distance between adjacent first wiring portions 7 in the second direction D2. One method for modifying the design of the first wiring portion 7 of the third element layer 27 is to prepare in advance multiple types of third element layers 27 that differ in the relative positions of the first wiring portions 7 in the second direction D2, and then select one type from the multiple types of third element layers 27 and stack it on the second element layers 23 to 26. Alternatively, in the third step S3, a third element layer 27 including the desired first wiring portion 7 may be formed, and the formed third element layer 27 may be stacked on the second element layers 23 to 26.

[0047] For example, the first element layer 22 shown in FIG. 11 can be applied in the first step S1, and the third element layer 27 shown in FIG. 12 can be applied in the third step S3, thereby changing the inductance value of the laminated coil component 1.

[0048] In the first element layer 22 shown in Fig. 11, the separation distance between the second wiring portions 6 in the second direction D2 is longer than in the form shown in Fig. 3. In the third element layer 27 shown in Fig. 12, the inclined portions 7c of the first wiring portions 7 are more inclined with respect to the first direction D1, and the separation distance between the first wiring portions 7 in the second direction D2 is longer than in the form shown in Fig. 5. When the element layers 27 and 28 shown in Figs. 11 and 12 are used, the magnetic path length L of the coil conductor 5 increases, as shown in Fig. 13.

[0049] 10 for the second element layers 23-26, and the design of the pillar portion 8 has not been changed. The wide pillar portion 8 having a length W2 in the second direction D2 allows for some degree of change in the position of the second wiring portion 6 in the second direction D2 while maintaining connection with the second wiring portion 6. Furthermore, the wide pillar portion 8 having a length W2 in the second direction D2 allows for some degree of change in the inclination of the inclined portion 7c of the first wiring portion 7 while maintaining connection with the first wiring portion 7, and also allows for some degree of change in the position of the first wiring portion 7 in the second direction D2.

[0050] In the above-described laminated coil component 1 and its manufacturing method, the magnetic path length L of the coil conductor 5 changes depending on the positions of the second wiring portion 6 and the first wiring portion 7 in the second direction D2, thereby changing the inductance value. From the perspective of the manufacturing method, in the first step S1 and the third step S3, the positions of the second wiring portion 6 and the first wiring portion 7 in the second direction D are determined within the range where they are connected to the wide pillar portion 8. The magnetic path length of the coil conductor changes depending on the positions of the second wiring portion 6 and the first wiring portion 7 in the second direction D2, thereby changing the inductance value. At this time, because the wide pillar portion 8 is included in the multiple pairs of pillar portions 8, the positions of the second wiring portion 6 and the first wiring portion 7 in the second direction D2 can be changed within the range where they are connected to the wide pillar portion 8 without changing the design of the multiple pairs of pillar portions 8. From the perspective of the manufacturing method, the inductance value can be adjusted in the first step S1 and the third step S3 while the second step S2 is the same. Therefore, in the laminated coil component 1, design changes to change the inductance value are easy.

[0051] The present invention is not necessarily limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention.

[0052] In this embodiment, the first and third pillar portions 8 of the pillar portions 8 in the first row 8A, counting from the side surface 2f, are wide pillar portions 8, and the first and third pillar portions 8 of the pillar portions 8 in the second row 8B, counting from the side surface 2f, are wide pillar portions 8. However, an embodiment in which only some of the four wide pillar portions are wide pillar portions may also be adopted. For example, the third pillar portion 8 of the pillar portions 8 in the first row 8A connected to the first wiring portion 7, counting from the side surface 2f, and the first pillar portion 8 of the pillar portions 8 in the second row 8B, counting from the side surface 2f, may both be wide pillar portions 8, or either one may be a wide pillar portion 8. As for the pillar portions 8 other than the wide pillar portion 8, as long as their lengths in the second direction D2 are narrower than those of the wide pillar portions 8, the length W1 in the second direction D2 of the second wiring portion 6 may be the same as or different from the length W1 of the second wiring portion 6.

[0053] As can be understood from the above description, the present specification discloses the following. [Appendix 1] an element body formed of a plurality of laminated insulating layers, the element body having a mounting surface that intersects with a lamination direction, a pair of end faces that face each other in a first direction that is parallel to the mounting surface, and a pair of side faces that face each other in a second direction that is perpendicular to the lamination direction and the first direction; a coil conductor provided within the element body, the coil conductor having a coil axis along the second direction and both ends extended to the mounting surface; a pair of terminal electrodes provided on a mounting surface of the element body and connected to both ends of the coil conductor, respectively; Equipped with The coil conductor is a plurality of first wiring portions extending parallel to the mounting surface and arranged in parallel along the second direction; a plurality of second wiring portions extending parallel to the mounting surface along the first direction on a side farther from the mounting surface than the first wiring portions and arranged in parallel along the second direction; a plurality of pairs of pillar portions extending along the stacking direction to connect the first wiring portion and the second wiring portion and arranged in two rows along the second direction; a pair of lead conductors that extend from two pillar portions located at the ends of a row of the plurality of pairs of pillar portions to the mounting surface and form both ends of the coil conductor that are connected to the pair of terminal electrodes, respectively; Equipped with a multilayer coil component in which at least one of two pillar portions located at an end of a row of the plurality of pairs of pillar portions and connected to the first wiring portion is a wide pillar portion whose length in the second direction is longer than that of the first wiring portion. [Appendix 2] 2. The laminated coil component according to claim 1, wherein the pair of lead conductors overlap the second wiring portion when viewed from the stacking direction. [Appendix 3] 3. The laminated coil component according to claim 1, wherein the wide pillar portion has a length in the second direction longer than the other pillar portions of the plurality of pairs of pillar portions. [Appendix 4] 4. The laminated coil component according to claim 1, wherein the wide pillar portion has a length in the second direction that is at least twice as long as the first wiring portion. [Appendix 5] 5. The laminated coil component according to claim 1, wherein the lengths in the second direction of the pair of lead conductors and the two pillar portions extending from the pair of lead conductors are the same as the length of the wide pillar portion. [Appendix 6] a first step of preparing a first element body layer including a plurality of lower wiring portions extending along a first direction in the layer and arranged in parallel along a second direction orthogonal to the first direction in the layer; a second step of stacking at least one second element body layer on the first element body layer, the second element body layer including a plurality of pairs of pillar conductors arranged in two rows along the second direction and provided at positions corresponding to the plurality of lower wiring portions; a third step of stacking a third element body layer on the second element body layer, the third element body layer including at least one upper wiring portion connecting the pillar conductors of the second element body layer and a pair of first lead conductors provided at positions corresponding to the pillar conductors; a fourth step of stacking a fourth element body layer on the third element body layer, the fourth element body layer including a pair of second lead conductors connected to the pair of first lead conductors, respectively; a fifth step of providing a fifth element layer on the fourth element layer, the fifth element layer having a pair of terminal electrodes connected to the pair of second lead conductors, respectively, and arranged along the first direction; Including, At least one of the pillar conductors located at an end of a column among the plurality of pairs of pillar conductors and connected to the lower wiring portion is a wide pillar conductor having a length in the second direction longer than that of the lower wiring portion, In the first step and the third step, the positions of the upper wiring portion and the lower wiring portion in the second direction are determined within a range where they are connected to the wide pillar conductor. [Explanation of symbols]

[0054] 1... multilayer coil component, 2... element body, 3, 4... bottom electrode, 5... coil conductor, 6... second wiring portion, 7... first wiring portion, 8... pillar portion, 21-29... element body layer, D1... first direction, D2... second direction, D3... third direction.

Claims

1. an element body formed of a plurality of laminated insulating layers, the element body having a mounting surface that intersects with a lamination direction, a pair of end faces that face each other in a first direction that is parallel to the mounting surface, and a pair of side faces that face each other in a second direction that is perpendicular to the lamination direction and the first direction; a coil conductor provided within the element body, the coil conductor having a coil axis along the second direction and both ends extended to the mounting surface; a pair of terminal electrodes provided on a mounting surface of the element body and connected to both ends of the coil conductor, respectively; Equipped with The coil conductor is a plurality of first wiring portions extending parallel to the mounting surface and arranged in parallel along the second direction; a plurality of second wiring portions extending parallel to the mounting surface along the first direction on a side farther from the mounting surface than the first wiring portions and arranged in parallel along the second direction; a plurality of pairs of pillar portions extending along the stacking direction to connect the first wiring portion and the second wiring portion and arranged in two rows along the second direction; a pair of lead conductors each extending from two pillar portions located at the ends of a row of the plurality of pairs of pillar portions to the mounting surface and constituting both ends of the coil conductor connected to the pair of terminal electrodes, respectively; Equipped with at least one of two pillar portions located at an end of a row of the plurality of pairs of pillar portions and connected to the first wiring portion is a wide pillar portion whose length in the second direction is longer than that of the first wiring portion.

2. The laminated coil component according to claim 1 , wherein the pair of lead conductors overlap the second wiring portion when viewed from the stacking direction.

3. The laminated coil component according to claim 1 , wherein the wide pillar portion has a length in the second direction longer than the other pillar portions of the plurality of pairs of pillar portions.

4. The laminated coil component according to claim 1 , wherein the length of the wide pillar portion in the second direction is at least twice as long as that of the first wiring portion.

5. 2. The laminated coil component according to claim 1, wherein the lengths in the second direction of the pair of lead conductors and the two pillar portions extending from the pair of lead conductors are the same as the length of the wide pillar portion.

6. a first step of preparing a first element body layer including a plurality of lower wiring portions extending along a first direction in the layer and arranged in parallel along a second direction in the layer that is perpendicular to the first direction; a second step of stacking at least one second element body layer on the first element body layer, the second element body layer including a plurality of pairs of pillar conductors arranged in two rows along the second direction and provided at positions corresponding to the plurality of lower wiring portions; a third step of stacking a third element body layer on the second element body layer, the third element body layer including at least one upper wiring portion connecting the pillar conductors of the second element body layer and a pair of first lead conductors provided at positions corresponding to the pillar conductors; a fourth step of stacking a fourth element body layer on the third element body layer, the fourth element body layer including a pair of second lead conductors connected to the pair of first lead conductors, respectively; a fifth step of providing a fifth element body layer on the fourth element body layer, the fifth element body layer having a pair of terminal electrodes connected to the pair of second lead conductors, respectively, and arranged along the first direction; Including, at least one of the pillar conductors located at an end of a column among the plurality of pairs of pillar conductors and connected to the lower wiring portion is a wide pillar conductor having a length in the second direction longer than that of the lower wiring portion; In the first step and the third step, the positions of the upper wiring portion and the lower wiring portion in the second direction are determined within a range where they are connected to the wide pillar conductor.

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