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, since each of the plurality of pairs of pillar portions 8 is located at a position separated from the tip positions of the end portions 6a and 6b of the second wiring portion 6 in the first direction D1, the area of the inner periphery of the coil conductors 5 is different from that in the form in which the pillar portions 8 are located at the tip positions of the end portions 6a and 6b of the second wiring portion 6. That is, when the distance by which the pillar portion 8 is separated from the tip positions of the end portions 6a and 6b of the second wiring portion 6 is changed, the inner diameter area and the inductance value of the coil conductor 5 are changed. At this time, the design of the plurality of first wire portions 7 and the plurality of second wire portions 6 can be unified, and it is not always necessary to change the design.SELECTED DRAWING: Figure 9

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, an element body having a mounting surface that intersects with the 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 has 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 second wiring portions that are parallel to the mounting surface and are arranged in parallel along the second direction, on a side farther from the mounting surface than the first wiring portions. the first wiring portion has an inclined portion extending in a direction inclined with respect to the first direction, and an end portion extending from at least one end of the inclined portion in the first direction in parallel to the first direction and overlapping with the second wiring portion when viewed from the stacking direction, and the pillar portion is spaced apart in the first direction from the tip position of the end of the second wiring portion.

[0007] In the above-described laminated coil component, since each of the pairs of pillar portions is located at a distance in the first direction from the tip position of the end of the second wiring portion, the inner diameter area of ​​the coil conductor differs from that of a configuration in which the pillar portions are located at the tip positions of the end of the second wiring portion, and therefore the inductance value also differs. In other words, if the distance at which the pillar portions are located from the tip positions of the end of the second wiring portion changes, the inner diameter area and inductance value of the coil conductor change. In this case, no design changes are required for the multiple first wiring portions and the multiple second wiring portions. Therefore, the above-described laminated coil component facilitates design changes to 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 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; and a second step of stacking at least one second element body layer on the first element body layer, the second element body layer including an inclined portion extending in a direction inclined with respect to the first direction and a pillar conductor extending parallel to the first direction from at least one end of the inclined portion with respect to the first direction and arranged downward as viewed from the stacking direction. The method includes a third step of stacking a third base body layer on the second base body layer, the third base body layer including a plurality of upper wiring parts having ends overlapping with the lower wiring parts and connecting the pillar conductors of the second base body layer, and a pair of first lead conductors provided at positions corresponding to the pillar conductors; a fourth step of stacking a fourth base body layer on the third base body layer, the fourth step including a pair of second lead conductors each connected to the pair of first lead conductors; and a fifth step of providing a fifth base body layer on the fourth base body layer, the fifth base body layer provided with a pair of terminal electrodes each connected to the pair of second lead conductors, wherein in the second step, the position of the pillar conductor in the first direction is determined within a range overlapping with the ends of the lower wiring part.

[0009] In the manufacturing method of the above-mentioned laminated coil component, in the second step, the position of the pillar conductor in the first direction is determined within a range overlapping with the end of the lower wiring portion. The determined position of the pillar conductor changes the inner diameter area of ​​the coil conductor, thereby changing the inductance value. For example, the inductance value of the coil conductor can be adjusted only in the second step while keeping the other steps the same. 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. 10 is a diagram showing a wiring section of a second element body layer having a different configuration. [Figure 11] FIG. 10 is a perspective view of a laminated coil component having a different configuration. [Figure 12] FIG. 10 is a side view of a laminated coil component having a different configuration. 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 five 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 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 body layer 22 will also be referred to as the first element body 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, there are five pairs. Specifically, the wiring portions 8a to 8d are aligned in two rows along the second direction D2, and are spaced equally apart in the second direction D2. In the following description, the row of the two aligned wiring portions 8a to 8d on the side of the end face 2a will be referred to as the first row 8A, and the row on the side of the end face 2b will be referred to as the second row 8B.

[0025] As shown in FIGS. 2 and 5 , multiple first wiring portions 7 are embedded in the element body layer 27, and in this embodiment, the element body layer 27 includes four first wiring portions 7. The element body layer 27 will also be referred to as a third element body layer in the following description. 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, and the pair of end portions 7a, 7b are 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. Both of the pair of end portions 7a, 7b extend parallel to the first direction D1. The length of each of the pair of ends 7a, 7b in the first direction D1 is designed to be longer than that of the wiring portions 8a to 8d. In this embodiment, the pair of ends 7a, 7b are designed to have the same length in the first direction D1. The pair of ends 7a, 7b are offset from each other in the second direction D2 when viewed from the third direction D3, and in this embodiment, the first end 7a is located closer to the side surface 2f than the second end 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 the pair of ends 7a, 7b that are offset from each other in the second direction D2. The inclination angle with respect to the first direction D1 is the same for all of the first wiring portions 7. That is, the inclined portions 7c of the first wiring portions 7 are parallel to each other.

[0026] When viewed from the third direction D3, the first end 7a of the first wiring portion 7 overlaps with one of the wiring portions 8a to 8d in the first row 8A and with one end 6a of the second wiring portions 6. When viewed from the third direction D3, the second end 7b of the first wiring portion 7 overlaps with one of the wiring portions 8a to 8d in the second row 8B and with one end 6b of the second wiring portions 6. In this embodiment, the second end 7b of the first wiring portion 7A of the four first wiring portions 7 overlaps with the first wiring portion 8a to 8d in the second row 8B, counting from the side surface 2f, and also overlaps with the end 6b of the first second wiring portion 6, counting from the side surface 2f, and the first end 7a overlaps with the second wiring portion 8a to 8d in the first row 8A, counting from the side surface 2f, and also overlaps with the end 6a of the second second wiring portion 6, counting from the side surface 2f. Similarly, the second end 7b of the first wiring portion 7B of the four first wiring portions 7 overlaps with the second wiring portion 8a to 8d of the wiring portions 8a to 8d in the second row 8B, counting from the side surface 2f, and also overlaps with the end 6b of the second wiring portion 6, counting from the side surface 2f, and the first end 7a overlaps with the third wiring portion 8a to 8d of the wiring portions 8a to 8d in the first row 8A, counting from the side surface 2f, and also overlaps with the end 6a of the third second wiring portion 6, counting from the side surface 2f. The second end 7b of the first wiring portion 7C of the four first wiring portions 7 overlaps with the third wiring portion 8a to 8d of the wiring portions 8a to 8d in the second row 8B, counting from the side surface 2f, and also overlaps with the end 6b of the third second wiring portion 6, counting from the side surface 2f, and the first end 7a overlaps with the fourth wiring portion 8a to 8d of the wiring portions 8a to 8d in the first row 8A, counting from the side surface 2f, and also overlaps with the end 6a of the fourth second wiring portion 6, counting from the side surface 2f. The second end 7b of the first wiring portion 7D of the four first wiring portions 7 overlaps with the fourth wiring portion 8a to 8d of the wiring portions 8a to 8d in the second row 8B, counting from the side surface 2f, and also overlaps with the end 6b of the fourth second wiring portion 6, counting from the side surface 2f, and the first end 7a overlaps with the fifth wiring portion 8a to 8d of the wiring portions 8a to 8d in the first row 8A, counting from the side surface 2f, and also overlaps with the end 6a of the fifth second wiring portion 6, counting from the side surface 2f.

[0027] Furthermore, a pair of wiring portions 8e (first lead wiring portions) are embedded in the element layer 27. Both of the pair of wiring portions 8e extend parallel to the first direction D1. 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 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 also overlaps the end portion 6a of the first second wiring portion 6 counting from the side surface 2f, thereby forming the end portion 5a of the coil conductor 5. The other of the pair of wiring portions 8e overlaps with the fifth wiring portion 8a to 8d of the second row 8B, counting from the side surface 2f, and also overlaps with the end portion 6b of the fifth second wiring portion 6, counting from the side surface 2f, thereby forming the end portion 5b of the coil conductor 5.

[0028] 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 portion 8f on the end face 2a side and the side face 2f side constitutes end portion 5a of coil conductor 5, and the wiring portion 8f on the end face 2b side and the side face 2e side constitutes end portion 5b of coil conductor 5. In this embodiment, wiring portion 8f does not overlap any of wiring portions 8a to 8d when viewed from third direction D3. In this embodiment, the length of wiring portion 8f in the first direction D1 is designed to be shorter than wiring portion 8e and the same as wiring portions 8a to 8d. The length of wiring portion 8f in the first direction D1 may be the same as wiring portion 8e. In the following description, element body layer 28 will also be referred to as the fourth element body layer.

[0029] 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.

[0030] The laminated coil component 1 can be produced by the manufacturing method shown in the flowchart of FIG.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Next, the pillar portion 8 according to this embodiment will be described with reference to FIGS.

[0035] In this embodiment, the wiring portions 8a-8d of each element layer 23-26 are stacked to form ten pillar portions 8. The pillar portions 8 are arranged in pairs in the first direction D1, and in this embodiment, there are five pairs. The five pairs of pillar portions 8 are aligned in two rows, a first row 8A and a second row 8B, along the second direction D2, similar to the wiring portions 8a-8d.

[0036] As shown in FIG. 9 , each of the pillar portions 8 is connected to the second wiring portion 6. Specifically, one end (the end on the main surface 2c side) of one pillar portion 8 is connected to a position spaced apart in the first direction D1 from the tip position of the end portion 6a of the second wiring portion 6, and one end of another pillar portion 8 is connected to a position spaced apart in the first direction D1 from the tip position of 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 substantially rectangular (specifically, substantially square). The cross-sectional shape of the pillar portion 8 may be, for example, circular, elliptical, or any polygonal shape other than rectangular.

[0037] In this embodiment, the first pillar portion 8 in the first row 8A, counting from the side surface 2f, has one end connected to 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 wiring portions 8e, 8f that constitute the end 5a of the coil conductor 5. The wiring portion 8f in this embodiment is offset in the first direction D1 from the pillar portion 8 when viewed from the third direction D3. The second to fifth pillar portions 8 in the first row 8A, counting from the side surface 2f, have one end connected to the second to fifth second wiring portions 6 counting from the side surface 2f, respectively, and the other end connected to positions spaced apart in the first direction D1 from the tip positions of the first ends 7a of the first to fourth first wiring portions 7 counting from the side surface 2f, respectively.

[0038] In this embodiment, the first to fourth pillar portions 8 in the second row 8B, counting from the side surface 2f, have one end connected to the first to fourth second wiring portions 6 counting from the side surface 2f, respectively, and the other end connected to a position spaced apart in the first direction D1 from the tip position of the second end portion 7b of the first to fourth first wiring portions 7 counting from the side surface 2f, respectively. The fifth pillar portion 8 in the second row 8B, counting from the side surface 2f, has one end connected to the fifth 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 wiring portions 8e and 8f that constitute the end portion 5b of the coil conductor 5. In this embodiment, the wiring portion 8f is offset in the first direction D1 from the pillar portion 8 when viewed from the third direction D3.

[0039] 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 4.5 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.

[0040] Here, the inductance value of the laminated coil component 1 will be described.

[0041] The inductance value of the laminated coil component 1 varies depending on the inner diameter area of ​​the coil conductor 5; the larger the inner diameter area, the larger the inductance value. As shown in FIG. 9 , the inner diameter shape of the coil conductor 5, as viewed in the second direction D2, is defined by the first wiring portion 7, the second wiring portion 6, and the pillar portion 8. The separation distance between the first wiring portion 7 and the second wiring portion 6 can be extended or shortened by changing the length of the pillar portion 8 in the stacking direction (e.g., the number of stacked pillar conductors). However, this affects the element dimensions (element height), requiring a major design change. On the other hand, the separation distance D between paired pillar portions 8 in the first direction D1 can be extended or shortened simply by changing the positions of the pillar portions 8 in the first direction D1. More precisely, the separation distance D between the pillar portions 8 can be defined as the distance between the inner surfaces of the pillar portions 8 that face each other in the first direction D1. The inductance value of the laminated coil component 1 increases as the separation distance D between the pillar portions 8 increases.

[0042] The first end 7a of the first wiring portion 7 extends along the first direction D1 and overlaps with the second wiring portion 6 over its entire length when viewed from the third direction D3. Therefore, the pillar portion 8 connected to the first end 7a of the first wiring portion 7 can change its position in the first direction within the range of the first end 7a of the first wiring portion 7 while maintaining its connection with the first wiring portion 7 and the second wiring portion 6. Similarly, the second end 7b of the first wiring portion 7 extends along the first direction D1 and overlaps with the second wiring portion 6 over its entire length when viewed from the third direction D3. Therefore, the pillar portion 8 connected to the second end 7b of the first wiring portion 7 can change its position in the first direction within the range of the second end 7b of the first wiring portion 7 while maintaining its connection with the first wiring portion 7 and the second wiring portion 6.

[0043] The positions of the pillar portions 8 in the first direction D1 can be changed by changing the design of the second element layers 23-26 in the second step S2 of the manufacturing method shown in Fig. 8. For example, in the second step S2, the positions of the pillar portions 8 and the separation distance D therebetween can be adjusted by changing the design of the positions of the paired wiring portions 8a-8d in the first direction D1 in each of the second element layers 23. One method for adjusting the positions of the pillar portions 8 and the separation distance D therebetween is to prepare in advance multiple types of second element layers 23-26 that differ in the positions of the wiring portions 8a-8d, and then select one type from the multiple types of second element layers 23-26 and stack it on the first element layer 22. Alternatively, in the second step S2, second element layers 23-26 including the desired wiring portions 8a-8d can be formed, and the formed second element layer 23-26 can be stacked on the first element layer 22.

[0044] For example, in the second step S2, the second element layers 23 to 26 shown in FIG. 10 can be applied, thereby changing the inductance value of the laminated coil component 1.

[0045] In the second element body layers 23 to 26 shown in FIG. 10, the wiring portions 8a to 8d in the first row 8A overlap the ends 6a of the second wiring portions 6 in the first direction D1 and are not separated from the tip positions of the ends 6a of the second wiring portions 6. The wiring portions 8a to 8d in the first row 8A overlap the first ends 7a of the first wiring portions 7 in the first direction D1 and are not separated from the tip positions of the first ends 7a of the first wiring portions 7. In the second element body layers 23 to 26 shown in FIG. 10, the wiring portions 8a to 8d in the second row 8B overlap the ends 6b of the second wiring portions 6 in the first direction D1 and are not separated from the tip positions of the ends 6b of the second wiring portions 6. The wiring portions 8a to 8d in the second row 8B overlap the second ends 7b of the first wiring portions 7 in the first direction D1 and are not separated from the tip positions of the second ends 7b of the first wiring portions 7.

[0046] 10 is applied, as shown in Figures 11 and 12, the pillar portions 8 are located between the tip positions of the ends 6a, 6b of the second wiring portion 6 and the tip positions of the ends 7a, 7b of the first wiring portion 7. Therefore, the separation distance D between the pair of pillar portions 8 in the first direction D1 is longer than in the form shown in Figure 9, and is the maximum distance in design.

[0047] In the above-described laminated coil component 1 and its manufacturing method, each of the pairs of pillar portions 8 is located at a distance in the first direction D1 from the tip positions of the ends 6 a, 6 b of the second wiring portion 6. Therefore, the inner diameter area of ​​the coil conductor 5 and the inductance value are different from those of the configuration shown in FIG. 12 in which the pillar portions 8 are located at the tip positions of the ends 6 a, 6 b of the second wiring portion 6. That is, if the distance between the pillar portion 8 and the tip positions of the ends 6 a, 6 b of the second wiring portion 6 changes, the inner diameter area and the inductance value of the coil conductor 5 change. From the viewpoint of the manufacturing method, in the second step S2, the position of the pillar portion 8 in the first direction D1 is determined within a range overlapping with the ends 6 a, 6 b of the second wiring portion 6. The inner diameter area of ​​the coil conductor 5 changes depending on the determined position of the pillar portion 8, and therefore the inductance value changes. In this case, the designs of the plurality of first wiring portions 7 and the plurality of second wiring portions 6 can be unified, and design changes are not necessarily required. From the viewpoint of the manufacturing method, the process content of only the second step S2 can be changed, and the process content of the first step S1 and the third step S3 can be the same, which makes it easy to change the design to change the inductance value of the laminated coil component 1.

[0048] 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.

[0049] For example, the length of second wiring unit 6 in the first direction D1 may be the same as or different from the length of first wiring unit 7 in the first direction D1. The length of second wiring unit 6 in the first direction D1 may be shorter than the length of first wiring unit 7 in the first direction D1. The shape of wiring unit 8f of fourth element body layer 28 may be the same as or different from the shape of wiring unit 8e of third element body layer 27. The shape of wiring unit 8f of fourth element body layer 28 may be the same as the shapes of wiring units 8a to 8d of second element body layers 23 to 26. The length of wiring unit 8f of fourth element body layer 28 in the first direction D1 may be the same as or different from the length of wiring unit 8e of third element body layer 27 in the first direction D1. The separation distance of wiring units 8f of fourth element body layer 28 in the first direction D1 may be the same as or different from the separation distance of wiring units 8e of third element body layer 27 in the first direction D1.

[0050] 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 from each of the plurality of second wiring portions toward the mounting surface along the stacking direction and arranged in two rows along the second direction; a pair of lead conductors that extend from two 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; Including, the first wiring portion has an inclined portion extending in a direction inclined with respect to the first direction, and an end portion extending parallel to the first direction from at least one end portion of the inclined portion with respect to the first direction and overlapping with the second wiring portion when viewed from the stacking direction, the pillar portion is spaced apart in the first direction from a tip position of the end portion of the second wiring portion. [Appendix 2] 2. The laminated coil component according to claim 1, wherein the pillar portion is spaced apart in the first direction from a tip position of an end portion of the first wiring portion. [Appendix 3] 3. The laminated coil component according to claim 1, wherein the pillar portion and the pair of lead conductors are misaligned in the first direction when viewed from the stacking direction. [Appendix 4] 4. The laminated coil component according to claim 1, wherein the first wiring portion and the second wiring portion have different lengths in the first direction. [Appendix 5] a first step of preparing a first element 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 a plurality of upper wiring parts each having an inclined portion extending in a direction inclined with respect to the first direction and an end portion extending parallel to the first direction from at least one end of the inclined portion relative to the first direction and overlapping with the lower wiring part when viewed from the stacking direction, the upper wiring parts 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; Including, In the second step, the position of the pillar conductor in the first direction is determined within a range where the pillar conductor overlaps with an end of the lower wiring portion. [Explanation of symbols]

[0051] 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 from each of the plurality of second wiring portions toward the mounting surface along the stacking direction and arranged in two rows along the second direction; a pair of lead conductors each extending from two 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; Including, the first wiring portion has an inclined portion extending in a direction inclined with respect to the first direction, and an end portion extending parallel to the first direction from at least one end portion of the inclined portion with respect to the first direction and overlapping with the second wiring portion when viewed from the stacking direction, the pillar portion is spaced apart in the first direction from a tip position of the end portion of the second wiring portion.

2. The laminated coil component according to claim 1 , wherein the pillar portion is spaced apart from a tip position of an end of the first wiring portion in the first direction.

3. The laminated coil component according to claim 1 , wherein the pillar portion and the pair of lead conductors are misaligned in the first direction when viewed from the stacking direction.

4. The laminated coil component according to claim 1 , wherein the first wiring portion and the second wiring portion have different lengths in the first direction.

5. 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, on the second element body layer, a third element body layer including a plurality of upper wiring parts each having an inclined portion extending in a direction inclined with respect to the first direction and an end portion extending parallel to the first direction from at least one end of the inclined portion relative to the first direction and overlapping with the lower wiring part when viewed from the stacking direction, the upper wiring parts 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; Including, In the second step, the position of the pillar conductor in the first direction is determined within a range where the pillar conductor overlaps an end of the lower wiring portion.

Images