Coil component

Abstract

To provide a coil component that can reduce parasitic capacitance.SOLUTION: In a coil component 1, one end of a coil 5 is connected to a first external electrode 3 at a position closest to the side surface 2e in a third direction D3, and a first distance L1 in a second direction D2 between a second coil conductor 15 closest to the side surface 2e and the first external electrode 3 and the second external electrode 4 is greater than a second distance L2 in the second direction D2 between a second coil conductor 16 closest to the first external electrode 3 and the second external electrode 4 and the first external electrode 3 and the second external electrode 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A known coil component is described in, for example, Patent Document 1. The coil component described in Patent Document 1 includes an element body having a pair of opposing end faces, a pair of opposing main surfaces, and a pair of opposing side surfaces, a coil disposed within the element body, the coil axis extending along the opposing direction of the pair of side surfaces and including a plurality of coil turns, and a pair of external electrodes to which the coil is connected. In the opposing direction of the pair of side surfaces, the end of the coil turn closest to one side surface is connected to one external electrode, and the end of the coil turn closest to the other side surface is connected to the other external electrode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-154716 Summary of the Invention [Problem to be solved by the invention]

[0004] In the coil component described above, the coil turn of the coil connected to one external electrode (the other external electrode) experiences a large potential difference at the portion facing the other external electrode (one external electrode). Therefore, an electric field concentrates in the coil turn at the portion facing the other external electrode (one external electrode). This increases the parasitic capacitance (stray capacitance) generated between the coil turn and the external electrode in the coil component. As a result, the coil's characteristics include a lower self-resonant frequency (SRF) and a lower quality factor (Q).

[0005] An object of one aspect of the present invention is to provide a coil component that can reduce parasitic capacitance. [Means for solving the problem]

[0006] (1) A coil component according to one aspect of the present invention comprises: an element body having a pair of end faces facing each other in a first direction, a main surface and a mounting surface facing each other in a second direction, and a pair of side surfaces facing each other in a third direction; a coil disposed within the element body and having a coil axis extending along the third direction; and a pair of external electrodes disposed on the mounting surface, wherein the coil includes a plurality of first conductors disposed on the main surface side, a plurality of second conductors disposed on the mounting surface side and extending linearly, and a plurality of third conductors connecting the first conductors and the second conductors, one end of the coil is connected to one of the external electrodes at a position closest to one of the side surfaces in the third direction, and a first distance in the second direction between the second conductor closest to one of the side surfaces and the pair of external electrodes is greater than a second distance in the second direction between the pair of external electrodes and a second conductor other than the second conductor closest to the one of the side surfaces and closest to the pair of external electrodes in the second direction.

[0007] In a coil component according to one aspect of the present invention, one end of the coil is connected to one external electrode at a position closest to one side surface in the third direction. Therefore, an electric field is concentrated in the portion of the second conductor closest to one side surface in the third direction facing the other external electrode. In this configuration, the first distance in the second direction between the second conductor closest to one side surface and one of the pair of external electrodes is greater than the second distance in the second direction between the second conductor other than the second conductor closest to the one side surface and the other of the pair of external electrodes. In this way, by making the first distance between the second conductor constituting the coil turn connected to one external electrode and the other external electrode greater than the second distance, the parasitic capacitance formed between the second conductor and the other external electrode can be reduced. Therefore, the coil component can achieve reduced parasitic capacitance.

[0008] (2) The coil component of (1) above may further include a connecting conductor that connects the first conductor, which is closest to one side surface and is connected to the second conductor and the third conductor, which are closest to one side surface, with one external electrode. In this configuration, an electric field is concentrated in the second conductor connected via the third conductor at a portion facing the other external electrode, which may increase the parasitic capacitance formed between the second conductor and the other external electrode. Therefore, a configuration in which the first distance is greater than the second distance is effective in reducing the parasitic capacitance in a configuration in which a connecting conductor that connects the first conductor, which is closest to one side surface, with one external electrode is included.

[0009] (3) In the coil component described in (1) or (2) above, the other end of the coil may be connected to the other external electrode at a position closest to the other side surface in the third direction, and a third distance in the second direction between the second conductor closest to the other side surface and the pair of external electrodes may be greater than the second distance. The electric field concentrates in the portion of the second conductor closest to the other side surface in the third direction facing one of the external electrodes. Therefore, by making the third distance between the second conductor constituting the coil turn connected to the other external electrode and one of the external electrodes greater than the second distance, the parasitic capacitance formed between the second conductor and one of the external electrodes can be reduced. Therefore, the coil component can further reduce parasitic capacitance.

[0010] (4) In the coil component of (3) above, the first distance and the third distance may be the same. In this configuration, the second conductor closest to one side surface and the second conductor closest to the other side surface are at the same height position in the second direction. This provides symmetry to the coil shape, improving the distribution of magnetic flux passing through the coil. This improves the characteristics of the coil component.

[0011] (5) In any one of the coil components (1) to (4) above, the second distance may be the distance in the second direction between the pair of external electrodes and a second conductor that is arranged next to the second conductor closest to one side surface in the third direction. This configuration ensures a sufficient diameter for the second conductor coils other than the second conductor closest to the side surface. Therefore, the coil component can ensure a sufficient inductance value.

[0012] (6) In any one of the coil components (1) to (5) above, a fifth distance in the second direction between the first conductor closest to one side surface and the second conductor closest to one side surface may be equal to or greater than half of a sixth distance in the second direction between a first conductor other than the first conductor closest to one side surface and a second conductor other than the second conductor closest to one side surface. This configuration ensures a sufficient diameter for the coil turn including the first conductor closest to one side surface and the second conductor closest to one side surface. Therefore, the coil component can ensure a sufficient inductance value. [Effects of the Invention]

[0013] According to one aspect of the present invention, it is possible to reduce parasitic capacitance. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a coil component according to one embodiment. [Figure 2] FIG. 2 is a view of the coil component shown in FIG. 1 as seen from the end face side. [Figure 3] FIG. 3 is a view of the coil device shown in FIG. 1 as seen from one side. [Figure 4] FIG. 4 is a view of the coil device shown in FIG. 1 as seen from the other side. [Figure 5] FIG. 5 is a schematic view of a coil component according to another embodiment, viewed from the end face side. [Figure 6] FIG. 6 is a diagram illustrating the configuration of the coil component shown in FIG. [Figure 7] FIG. 7 is an exploded perspective view of the coil component shown in FIG. [Figure 8] FIG. 8 is a schematic view of a coil component according to another embodiment as viewed from the end face side. [Figure 9] FIG. 9 is a diagram illustrating the configuration of the coil component shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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.

[0016] Fig. 1 is a perspective view of a coil component according to one embodiment. Fig. 2 is a view of the coil component shown in Fig. 1 as seen from an end face side. Fig. 3 is a view of the coil component shown in Fig. 1 as seen from one side face side. Fig. 4 is a view of the coil component shown in Fig. 1 as seen from the other side face side. As shown in Figs. 1 to 4, the coil component 1 includes an element body 2, a first external electrode 3 and a second external electrode 4, a coil 5, a first connecting conductor 6 and a second connecting conductor 7.

[0017] The element body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and ridges, and a rectangular parallelepiped shape with rounded corners and ridges. The element body 2 has, 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 main faces 2c and 2d is referred to as a second direction D2, and the facing direction of the side faces 2e and 2f is referred to as a third direction D3. The first direction D1, the second direction D2, and the third direction D3 are approximately perpendicular to each other.

[0018] The end faces 2a, 2b extend in the second direction D2 to connect the principal faces 2c, 2d. The end faces 2a, 2b also extend in the third direction D3 to connect the side faces 2e, 2f. The principal faces 2c, 2d extend in the first direction D1 to connect the end faces 2a, 2b. The principal faces 2c, 2d also extend in the third direction D3 to connect the side faces 2e, 2f. The side faces 2e, 2f extend in the first direction D1 to connect the end faces 2a, 2b. The side faces 2e, 2f also extend in the second direction D2 to connect the principal faces 2c, 2d.

[0019] The main surface 2d is a mounting surface that faces another electronic device (not shown) when the coil device 1 is mounted on the other electronic device (for example, a circuit board or an electronic component). The end surfaces 2a and 2b are surfaces that are continuous with the mounting surface (i.e., the main surface 2d).

[0020] 1 to 4, the length of the element body 2 in the first direction D1 is longer than the length of the element body 2 in the second direction D2 and the length of the element body 2 in the third direction D3. The length of the element body 2 in the second direction D2 is shorter than the length of the element body 2 in the third direction D3. 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 second direction D2 may be equal to the length of the element body 2 in the third direction D3, or may be longer than the length of the element body 2 in the third direction D3.

[0021] 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.

[0022] The element body 2 is formed by stacking multiple element layers (insulator layers) in the second direction D2. That is, the stacking direction of the element body 2 is the second direction D2. In an actual element body 2, the multiple element layers 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.

[0023] The element layer may be, for example, a resin layer. The material of the element layer may include, for example, at least one selected from liquid crystal polymer, polyimide resin, crystalline polystyrene, epoxy resin, acrylic resin, bismaleimide resin, and fluorine resin. The element layer may include a filler. The filler may be, for example, an inorganic filler. An example of the inorganic filler is silica (SiO2). Note that the element layer does not necessarily include a filler.

[0024] The base layer may be configured to include a magnetic material. The magnetic material of the base layer may include, for example, a Ni-Cu-Zn ferrite material, a Ni-Cu-Zn-Mg ferrite material, or a Ni-Cu ferrite material. The magnetic material of the base layer may include, for example, an Fe alloy. The base layer may include, for example, a non-magnetic material. The non-magnetic material of the base layer may include, for example, a glass ceramic material or a dielectric material.

[0025] The first external electrode 3 and the second external electrode 4 are each provided on the element body 2. The first external electrode 3 and the second external electrode 4 are each arranged on the main surface 2d of the element body 2. The first external electrode 3 and the second external electrode 4 are provided on the element body 2 so as to be spaced apart from each other in the first direction D1. Specifically, the first external electrode 3 is arranged on the end face 2a side of the element body 2. The second external electrode 4 is arranged on the end face 2b side of the element body 2.

[0026] Each of the first external electrode 3 and the second external electrode 4 may have, for example, a rectangular shape (rectangular shape). Each of the first external electrode 3 and the second external electrode 4 is arranged so that each side extends along the first direction D1 or the third direction D3. As shown in FIG. 2, the surface of each of the first external electrode 3 and the second external electrode 4 is flush with the main surface 2d. That is, in this embodiment, each of the first external electrode 3 and the second external electrode 4 does not protrude from the main surface 2d. The first external electrode 3 and the second external electrode 4 are formed of a conductive material (for example, Cu).

[0027] Each of the first external electrode 3 and the second external electrode 4 may be provided with a plating layer (not shown) containing, for example, Ni, Sn, Au, etc. by electrolytic plating or electroless plating. The plating layer may include, for example, a Ni plating film containing Ni and covering the first external electrode 3 and the second external electrode 4, and an Au plating film containing Au and covering the Ni plating film.

[0028] The coil 5 is disposed within the element body 2. The coil axis AX of the coil 5 extends along the second direction D2. One end of the coil 5 is connected to the first external electrode 3. Specifically, the one end of the coil 5 is connected to the first external electrode 3 at a position closest to the side surface 2e in the third direction D3. The other end of the coil 5 is connected to the second external electrode 4. Specifically, the other end of the coil 5 is connected to the second external electrode 4 at a position closest to the side surface 2f in the third direction D3.

[0029] The coil 5 includes first coil conductors (first conductors) 10, 11, 12, 13, and 14, second coil conductors (second conductors) 15, 16, 17, and 18, and third coil conductors (third conductors) 19, 20, 21, 22, 23, 24, 25, and 26. The number of second coil conductors 15, 16, 17, and 18 is one less than the number of first coil conductors 10, 11, 12, 13, and 14. In other words, if there are n first coil conductors, there will be n-1 second coil conductors.

[0030] In the coil 5, the first coil conductor 10, the first coil conductor 11, the first coil conductor 12, the first coil conductor 13, and the first coil conductor 14 are arranged in this order between the side surface 2e and the side surface 2f. The first coil conductor 11, the first coil conductor 12, and the first coil conductor 13 are arranged between the first coil conductor 10 and the first coil conductor 14. The first coil conductor 10 is the outermost coil conductor closest to the side surface 2e (one side surface) in the third direction D3. The first coil conductor 14 is the outermost coil conductor closest to the side surface 2f (the other side surface) in the third direction D3.

[0031] In the coil 5, the second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 are arranged in this order between the side surface 2e and the side surface 2f. The second coil conductor 16 and the second coil conductor 17 are arranged between the second coil conductor 15 and the second coil conductor 18. The second coil conductor 15 is the outermost coil conductor closest to the side surface 2e in the third direction D3. The second coil conductor 18 is the outermost coil conductor closest to the side surface 2f in the third direction D3.

[0032] In the coil 5, the third coil conductor 19, the third coil conductor 20, the third coil conductor 21, and the third coil conductor 22 are arranged in this order between the side surface 2e and the side surface 2f. In the coil 5, the third coil conductor 23, the third coil conductor 24, the third coil conductor 25, and the third coil conductor 26 are arranged in this order between the side surface 2e and the side surface 2f.

[0033] The first coil conductor 10, the first coil conductor 11, the first coil conductor 12, the first coil conductor 13, and the first coil conductor 14 are arranged at positions closer to (on the main surface 2c side of) the element body 2. The first coil conductor 10, the first coil conductor 11, the first coil conductor 12, the first coil conductor 13, and the first coil conductor 14 extend linearly along the first direction D1. The cross sections of the first coil conductor 10, the first coil conductor 11, the first coil conductor 12, the first coil conductor 13, and the first coil conductor 14 are, for example, rectangular.

[0034] The first coil conductor 10 connects the first connecting conductor 6 and the third coil conductor 23. One end of the first coil conductor 10 in the extension direction (the end on the end surface 2a side) is connected to one end of the first connecting conductor 6 (the end on the main surface 2c side). The other end of the first coil conductor 10 in the extension direction (the end on the end surface 2b side) is connected to one end of the third coil conductor 23 (the end on the main surface 2c side).

[0035] The first coil conductor 11 connects the third coil conductor 19 and the third coil conductor 24. One end of the first coil conductor 11 in the extension direction is connected to one end of the third coil conductor 19. The other end of the first coil conductor 11 in the extension direction is connected to one end of the third coil conductor 24.

[0036] The first coil conductor 12 connects the third coil conductor 20 and the third coil conductor 25. One end of the first coil conductor 12 in the extension direction is connected to one end of the third coil conductor 20. The other end of the first coil conductor 12 in the extension direction is connected to one end of the third coil conductor 25.

[0037] The first coil conductor 13 connects the third coil conductor 21 and the third coil conductor 26. One end of the first coil conductor 13 in the extension direction is connected to one end of the third coil conductor 21. The other end of the first coil conductor 13 in the extension direction is connected to one end of the third coil conductor 26.

[0038] The first coil conductor 14 connects the third coil conductor 22 and the second connecting conductor 7. One end of the first coil conductor 14 in the extending direction is connected to one end of the third coil conductor 22. The other end of the first coil conductor 14 in the extending direction is connected to one end of the second connecting conductor 7.

[0039] The second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 are arranged at positions closer to the main surface 2d of the element body 2 (on the main surface 2d side). The second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 extend at an angle with respect to the first direction D1. The second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 extend linearly. The cross sections of the second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 are, for example, rectangular.

[0040] The second coil conductor 15 connects the third coil conductor 19 and the third coil conductor 23. One end of the second coil conductor 15 in the extension direction is connected to the other end (the end on the main surface 2d side) of the third coil conductor 19. The other end of the second coil conductor 15 in the extension direction is connected to the other end of the third coil conductor 23.

[0041] The second coil conductor 16 connects the third coil conductor 20 and the third coil conductor 24. One end of the second coil conductor 16 in the extension direction is connected to the other end of the third coil conductor 20. The other end of the second coil conductor 16 in the extension direction is connected to the other end of the third coil conductor 24.

[0042] The second coil conductor 17 connects the third coil conductor 21 and the third coil conductor 25. One end of the second coil conductor 17 in the extension direction is connected to the other end of the third coil conductor 21. The other end of the second coil conductor 17 in the extension direction is connected to the other end of the third coil conductor 25.

[0043] The second coil conductor 18 connects the third coil conductor 22 and the third coil conductor 26. One end of the second coil conductor 18 in the extension direction is connected to the other end of the third coil conductor 22. The other end of the second coil conductor 18 in the extension direction is connected to the other end of the third coil conductor 26.

[0044] The third coil conductor 19, the third coil conductor 20, the third coil conductor 21, and the third coil conductor 22 are arranged closer to the end face 2a of the element body 2. The third coil conductor 23, the third coil conductor 24, the third coil conductor 25, and the third coil conductor 26 are arranged closer to the end face 2b of the element body 2. The third coil conductor 19, the third coil conductor 20, the third coil conductor 21, the third coil conductor 22, the third coil conductor 23, the third coil conductor 24, the third coil conductor 25, and the third coil conductor 26 extend along the second direction D2. The third coil conductor 19, the third coil conductor 20, the third coil conductor 21, the third coil conductor 22, the third coil conductor 23, the third coil conductor 24, the third coil conductor 25, and the third coil conductor 26 can be formed by stacking a plurality of members in the second direction D2. The cross sections of the third coil conductor 19, the third coil conductor 20, the third coil conductor 21, the third coil conductor 22, the third coil conductor 23, the third coil conductor 24, the third coil conductor 25 and the third coil conductor 26 are, for example, rectangular.

[0045] The third coil conductor 19 connects the first coil conductor 11 and the second coil conductor 15. The third coil conductor 20 connects the first coil conductor 12 and the second coil conductor 16. The third coil conductor 21 connects the first coil conductor 13 and the second coil conductor 17. The third coil conductor 22 connects the first coil conductor 14 and the second coil conductor 18.

[0046] The third coil conductor 23 connects the first coil conductor 10 and the second coil conductor 15. The third coil conductor 24 connects the first coil conductor 11 and the second coil conductor 16. The third coil conductor 25 connects the first coil conductor 12 and the second coil conductor 17. The third coil conductor 26 connects the first coil conductor 13 and the second coil conductor 18.

[0047] The second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 are arranged in positions that overlap the first external electrode 3 and the second external electrode 4 when viewed from the second direction D2. That is, the second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 have portions that face the first external electrode 3 and the second external electrode 4, respectively, in the second direction D2. At least a portion of the second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 faces the first external electrode 3 and the second external electrode 4, respectively, in the second direction D2.

[0048] The first coil conductor 10, the first coil conductor 11, the first coil conductor 12, the first coil conductor 13, and the first coil conductor 14 are substantially parallel to the principal surfaces 2c and 2d. The second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18 are substantially parallel to the principal surfaces 2c and 2d. In other words, the first coil conductor 10, the first coil conductor 11, the first coil conductor 12, the first coil conductor 13, and the first coil conductor 14 are substantially parallel to the second coil conductor 15, the second coil conductor 16, the second coil conductor 17, and the second coil conductor 18.

[0049] The first connecting conductor 6 connects the first external electrode 3 and one end of the coil 5. The first connecting conductor 6 is connected to one end of the first coil conductor 10 of the coil 5. The first connecting conductor 6 is disposed near the end face 2a and the side face 2e. The first connecting conductor 6 is made of a conductive material. For example, the first connecting conductor 6 is made of Cu.

[0050] The second connecting conductor 7 connects the second external electrode 4 and the other end of the coil 5. The second connecting conductor 7 is connected to the other end of the first coil conductor 14 of the coil 5. The second connecting conductor 7 is disposed near the end face 2b and the side face 2f. The second connecting conductor 7 is made of a conductive material. For example, the second connecting conductor 7 is made of Cu.

[0051] 3, in the coil device 1, the first distance L1 in the second direction D2 between the second coil conductor 15 closest to the side surface 2e and the first external electrode 3 and the second external electrode 4 is greater than the second distance L2 in the second direction D2 between the second coil conductor 16 and the first external electrode 3 and the second external electrode 4 (L1>L2). That is, the second coil conductor 15 is farther away from the first external electrode 3 and the second external electrode 4 than the second coil conductor 16. The second coil conductor 15 is disposed closer to the main surface 2c in the second direction D2 than the second coil conductor 16. In other words, the second coil conductor 16 is disposed closer to the main surface 2d in the second direction D2 than the second coil conductor 15.

[0052] 4, in the coil device 1, a third distance L3 in the second direction D2 between the second coil conductor 18, which is closest to the side surface 2f, and the first external electrode 3 and the second external electrode 4 is greater than a fourth distance L4 in the second direction D2 between the second coil conductor 17 and the first external electrode 3 and the second external electrode 4 (L3>L4). That is, the second coil conductor 18 is farther away from the first external electrode 3 and the second external electrode 4 than the second coil conductor 17. The second coil conductor 18 is positioned closer to the main surface 2c in the second direction D2 than the second coil conductor 17. In other words, the second coil conductor 17 is positioned closer to the main surface 2d in the second direction D2 than the second coil conductor 18.

[0053] In this embodiment, the first distance L1 and the third distance L3 are the same (L1 = L3). That is, the second coil conductor 15 and the second coil conductor 18 are at the same height position in the second direction D2. The second distance L2 and the fourth distance L4 are the same (L2 = L4). That is, the second coil conductor 16 and the second coil conductor 17 are at the same height position in the second direction D2. The second coil conductor 16 and the second coil conductor 17 are the conductors closest to the first external electrode 3 and the second external electrode 4.

[0054] When viewed from the third direction D3, the fifth distance L5 between the first coil conductor 10 and the second coil conductor 15 and the sixth distance L6 between the first coil conductor 11 and the second coil conductor 16 are equal to or greater than half the distance L6. The seventh distance L7 between the first coil conductor 14 and the second coil conductor 18 is equal to or greater than half the distance L8 between the first coil conductor 13 and the second coil conductor 17.

[0055] The coil component 1 can be manufactured, for example, as follows. The element body 2 can be formed by laminating sheets that constitute element body layers. The coil 5, the first connecting conductor 6, and the second connecting conductor 7 can be manufactured using a photolithography method. The "photolithography method" is not limited to any particular type of mask, as long as it processes a layer containing a photosensitive material into a desired pattern by exposing and developing it.

[0056] As described above, in the coil component 1 according to this embodiment, one end of the coil 5 is connected to the first external electrode 3 at a position closest to the side surface 2e in the third direction D3. Therefore, an electric field is concentrated in the portion of the second coil conductor 15 closest to the side surface 2e in the third direction D3 that faces the second external electrode 4. In this configuration, in the coil component 1, the first distance L1 in the second direction D2 between the second coil conductor 15 and the first external electrode 3 and the second external electrode 4 is greater than the second distance L2 in the second direction D2 between the second coil conductor 17 and the first external electrode 3 and the second external electrode 4. In this way, in the coil component 1, by making the first distance L1 between the second coil conductor 15, which constitutes the coil turn connected to the first external electrode 3, and the second external electrode 4, greater than the second distance L2, the parasitic capacitance formed between the second coil conductor 15 and the second external electrode 4 can be reduced. Therefore, in the coil component 1, the parasitic capacitance can be further reduced.

[0057] In order to reduce the parasitic capacitance formed between the second coil conductor 15 and the second external electrode 4 (between the second coil conductor 18 and the first external electrode 3), a configuration may be considered in which the distance between the second coil conductor 15 and the second external electrode 4 is increased only in the portion of the second coil conductor 15 facing the second external electrode 4. In this configuration, it is necessary to provide a bent portion in the second coil conductor 15. In a configuration in which a bent portion is provided in the second coil conductor 15, multiple conductors are connected to form the bent portion, which increases the number of connection portions between the conductors. Since problems such as poor connection can occur at the connection portions, the probability of problems occurring increases as the number of connection portions increases. This may result in variations in the characteristics of the coil component.

[0058] In the coil component 1, the second coil conductor 15 is linear. That is, the second coil conductor 15 does not have any bends or the like. Therefore, in the coil component 1, defects caused by bends or the like can be avoided, and variations in characteristics can be avoided. Furthermore, because the coil component 1 does not have any bends or the like, current loss can be reduced.

[0059] In the coil component 1 according to this embodiment, the second coil conductor 18 is connected to the second external electrode 4 at a position closest to the side surface 2f in the third direction D3. In this configuration, the third distance L3 in the second direction D2 between the second coil conductor 18 and the first external electrode 3 and second external electrode 4 is greater than the fourth distance L4 in the second direction D2 between the second coil conductor 18 and the first external electrode 3 and second external electrode 4. In the second coil conductor 18 closest to the side surface 2f in the third direction D3, an electric field concentrates in a portion facing the first external electrode 3. Therefore, by making the third distance L3 between the second coil conductor 18 constituting the coil turn connected to the second external electrode 4 and the first external electrode 3 greater than the fourth distance L4, the parasitic capacitance formed between the second coil conductor 18 and the first external electrode 3 can be reduced. Therefore, the coil component 1 can further reduce the parasitic capacitance.

[0060] In the coil component 1 according to this embodiment, the first distance L1 in the second direction D2 between the second coil conductor 15 closest to the side surface 2e and the first external electrode 3 and the second external electrode 4 is the same as the third distance L3 in the second direction D2 between the second coil conductor 18 closest to the side surface 2f and the first external electrode 3 and the second external electrode 4. In this configuration, the second coil conductor 15 and the second coil conductor 18 are at the same height position in the second direction D2. This gives the coil 5 a symmetrical shape, resulting in a good distribution of magnetic flux penetrating the coil 5. This improves the characteristics of the coil component 1.

[0061] In the coil component 1 according to this embodiment, when viewed from the third direction D3, the fifth distance L5 between the first coil conductor 10 and the second coil conductor 15 is equal to or greater than half the sixth distance L6 between the first coil conductor 11 and the second coil conductor 16. The seventh distance L7 between the first coil conductor 14 and the second coil conductor 18 is equal to or greater than half the eighth distance L8 between the first coil conductor 13 and the second coil conductor 17. With this configuration, the diameter of the coil turn including the first coil conductor 10 and the second coil conductor 15 and the diameter of the coil turn including the first coil conductor 14 and the second coil conductor 18 can be ensured. Therefore, the coil component 1 can ensure a sufficient inductance value.

[0062] Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0063] In the above embodiment, an example has been described in which the first distance L1 in the second direction D2 between the second coil conductor 15 and the first external electrode 3 and the second external electrode 4 is greater than the second distance L2 in the second direction D2 between the second coil conductor 17 and the first external electrode 3 and the second external electrode 4, and the third distance L3 in the second direction D2 between the second coil conductor 18 and the first external electrode 3 and the second external electrode 4 is greater than the fourth distance L4 in the second direction D2 between the second coil conductor 17 and the first external electrode 3 and the second external electrode 4. However, the coil device 1 may have at least one of a configuration in which the first distance L1 is greater than the second distance L2 and a configuration in which the third distance L3 is greater than the fourth distance L4.

[0064] In the above embodiment, the first distance L1 and the third distance L3 are the same. However, the first distance L1 and the third distance L3 may be different.

[0065] In the above embodiment, the second distance L2 and the fourth distance L4 are the same. However, the second distance L2 and the fourth distance L4 may be different.

[0066] In the above embodiment, the second coil conductor 16 and the second coil conductor 17, which are arranged between the second coil conductor 15 and the second coil conductor 18, are the conductors closest to the first external electrode 3 and the second external electrode 4 in the second direction D2. However, the conductors closest to the first external electrode 3 and the second external electrode 4 in the second direction D2 may be other conductors.

[0067] Fig. 5 is a schematic diagram of a coil component according to another embodiment, viewed from the end face side. As shown in Fig. 5, in the coil component 1A, the second coil conductor 30, which is disposed between the second coil conductor 16 and the second coil conductor 17, is the conductor closest to the first external electrode 3 and the second external electrode 4 in the second direction D2.

[0068] 5, a first distance L1 in the second direction D2 between the second coil conductor 15 and the first external electrode 3 and the second external electrode 4, and a third distance L3 in the second direction D2 between the second coil conductor 18 and the first external electrode 3 and the second external electrode 4 are greater than a distance L9 in the second direction D2 between the second coil conductor 30 and the first external electrode 3 and the second external electrode 4 (L1, L3>L9). The second distance L2 and the fourth distance L4 are greater than distance L9 (L2, L4>L9).

[0069] The configuration of the coil component 1A will be described in detail below. Fig. 6 is a diagram showing the configuration of the coil component 1A shown in Fig. 5. Fig. 7 is an exploded perspective view of the coil component 1A shown in Fig. 5.

[0070] As shown in FIG. 7, the first external electrode 3 of the coil device 1A has a plurality of electrode conductors 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i, 3j, and 3k. The first external electrode 3 is configured by stacking the plurality of electrode conductors 3a to 3k in a first direction D1. The plurality of electrode conductors 3a to 3k are aligned in the first direction D1 and connected to one another. The plurality of electrode conductors 3a to 3k being connected to one another means that the plurality of electrode conductors 3a to 3k are electrically and physically connected to one another. In an actual first external electrode 3, the electrode conductors 3a to 3k may be integrated to the extent that the boundaries between the electrode conductors 3a to 3k are not visible.

[0071] The second external electrode 4 of the coil device 1A has a plurality of electrode conductors 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j, and 4k. The second external electrode 4 is configured by stacking the plurality of electrode conductors 4a to 4k in a first direction D1. The plurality of electrode conductors 4a to 4k are aligned in the first direction D1 and connected to one another. In an actual second external electrode 4, the electrode conductors 4a to 4k may be integrated to the extent that the boundaries between the electrode conductors 4a to 4k are not visible.

[0072] 6 and 7, the coil 5A has a coil conductor portion 50, a coil conductor portion 51, a coil conductor portion 52, a coil conductor portion 53, a coil conductor portion 54, a coil conductor portion 55, a coil conductor portion 56, a coil conductor portion 57, a coil conductor portion 58, a coil conductor portion 59, and a coil conductor portion 60. The coil conductor portions 50 to 60 are arranged in the following order from the side surface 2e to the side surface 2f of the element body 2: coil conductor portion 50, coil conductor portion 51, coil conductor portion 52, coil conductor portion 53, coil conductor portion 54, coil conductor portion 55, coil conductor portion 56, coil conductor portion 57, coil conductor portion 58, coil conductor portion 59, and coil conductor portion 60.

[0073] 7, the coil conductor portion 50 is connected to the electrode conductor 3a via the connection conductor portion 61. This electrically connects the coil 5A to the first external electrode 3. The coil conductor portion 60 is connected to the electrode conductor 4k via the connection conductor portion 62. This electrically connects the coil 5A to the second external electrode 4.

[0074] Coil conductor portion 50 and coil conductor portion 51 are connected by through-hole conductor 63. Coil conductor portion 51 and coil conductor portion 52 are connected by through-hole conductor 64. Coil conductor portion 52 and coil conductor portion 53 are connected by through-hole conductor 65. Coil conductor portion 53 and coil conductor portion 54 are connected by through-hole conductor 66. Coil conductor portion 54 and coil conductor portion 55 are connected by through-hole conductor 67. Coil conductor portion 55 and coil conductor portion 56 are connected by through-hole conductor 68. Coil conductor portion 56 and coil conductor portion 57 are connected by through-hole conductor 69. Coil conductor portion 57 and coil conductor portion 58 are connected by through-hole conductor 70. Coil conductor portion 58 and coil conductor portion 59 are connected by through-hole conductor 71. Coil conductor portion 59 and coil conductor portion 60 are connected by through-hole conductor 72.

[0075] The coil conductor portion 51 constitutes the second coil conductor 15. The coil conductor portion 53 constitutes the second coil conductor 16. The coil conductor portion 55 constitutes the second coil conductor 30. The coil conductor portion 57 constitutes the second coil conductor 17. The coil conductor portion 59 constitutes the second coil conductor 18.

[0076] 8 is a schematic diagram of a coil component according to another embodiment, viewed from the end surface side. As shown in FIG. 8, in the coil component 1B, the first distance L1 between the second coil conductor 15 and the first external electrode 3 and the second external electrode 4 in the second direction D2 and the third distance L3 between the second coil conductor 18 and the first external electrode 3 and the second external electrode 4 in the second direction D2 are greater than the distance L9 between the second coil conductor 30 and the first external electrode 3 and the second external electrode 4 in the second direction D2 (L1, L3 > L9). The distance L10 between the second coil conductor 16 and the first external electrode 3 and the second external electrode 4 in the second direction D2 and the distance L11 between the second coil conductor 17 and the first external electrode 3 and the second external electrode 4 in the second direction D2 are greater than the distance L9 (L2, L4 > L9). The first distance L1 and the third distance L3 are the same as the distance L10 and the distance L11.

[0077] Fig. 9 is a diagram showing the configuration of coil device 1B shown in Fig. 8. As shown in Fig. 9, coil 5B of coil device 1B has coil conductor portion 73, coil conductor portion 74, coil conductor portion 75, coil conductor portion 76, coil conductor portion 77, coil conductor portion 78, coil conductor portion 79, coil conductor portion 80, coil conductor portion 81, coil conductor portion 82, and coil conductor portion 83. Coil conductor portions 73 to 83 are arranged in the following order from side surface 2e to side surface 2f of element body 2: coil conductor portion 73, coil conductor portion 74, coil conductor portion 75, coil conductor portion 76, coil conductor portion 767, coil conductor portion 78, coil conductor portion 79, coil conductor portion 80, coil conductor portion 81, coil conductor portion 82, and coil conductor portion 83.

[0078] As shown in FIG. 9, the coil conductor portion 73 is connected to the electrode conductor 3a (see FIG. 7) via the connection conductor portion 84. This electrically connects the coil 5B to the first external electrode 3. The coil conductor portion 83 is connected to the electrode conductor 4k (see FIG. 7) via the connection conductor portion 85. This electrically connects the coil 5B to the second external electrode 4.

[0079] Coil conductor portion 73 and coil conductor portion 74 are connected by through-hole conductor 86. Coil conductor portion 74 and coil conductor portion 75 are connected by through-hole conductor 87. Coil conductor portion 75 and coil conductor portion 76 are connected by through-hole conductor 88. Coil conductor portion 76 and coil conductor portion 77 are connected by through-hole conductor 89. Coil conductor portion 77 and coil conductor portion 78 are connected by through-hole conductor 90. Coil conductor portion 78 and coil conductor portion 79 are connected by through-hole conductor 91. Coil conductor portion 79 and coil conductor portion 80 are connected by through-hole conductor 92. Coil conductor portion 80 and coil conductor portion 81 are connected by through-hole conductor 93. Coil conductor portion 81 and coil conductor portion 82 are connected by through-hole conductor 94. Coil conductor portion 82 and coil conductor portion 83 are connected by through-hole conductor 95.

[0080] The coil conductor portion 74 constitutes the second coil conductor 15. The coil conductor portion 76 constitutes the second coil conductor 16. The coil conductor portion 78 constitutes the second coil conductor 30. The coil conductor portion 80 constitutes the second coil conductor 17. The coil conductor portion 82 constitutes the second coil conductor 18.

[0081] Coil device 1A and coil device 1B can be manufactured, for example, as follows: element body 2 can be formed by stacking sheets that constitute element body layers, and coils 5A and 5B can be manufactured by connecting adjacent conductors with through holes.

[0082] In the above embodiment, an example has been described in which the first external electrode 3 and the second external electrode 4 protrude beyond the main surface 2d. However, the first external electrode 3 and the second external electrode 4 may be embedded within the element body 2. That is, the first external electrode 3 and the second external electrode 4 may be provided substantially flush with the main surface 2d. In this configuration, the plating layers provided on the first external electrode 3 and the second external electrode 4 may protrude beyond the main surface 2d.

[0083] In the above embodiment, the first coil conductor, the second coil conductor, and the third coil conductor have rectangular cross sections. However, the cross sections of the first coil conductor, the second coil conductor, and the third coil conductor may have other shapes, such as an ellipse. [Explanation of symbols]

[0084] 1, 1A, 1B... coil component, 2... element body, 2a, 2b... end face, 2c, 2d... main surface, 2e... side face (one side face), 2f... side face (other side face), 5, 5A, 5B... coil, 10, 11, 12, 13, 14... first coil conductor (first conductor), 15, 16, 17, 18, 30... second coil conductor (second conductor), 19, 20, 21, 22, 23, 24, 25, 26... third coil conductor (third conductor), AX... coil axis, D1... first direction, D2... second direction, D3... third direction, L1... first distance, L2... second distance, L3... third distance, L5... fifth distance, L6... sixth distance.

Claims

1. an element body having a pair of end faces facing each other in a first direction, a main surface and a mounting surface facing each other in a second direction, and a pair of side surfaces facing each other in a third direction; a coil disposed within the element body and having a coil axis extending along the third direction; a pair of external electrodes disposed on the mounting surface, the coil includes a plurality of first conductors arranged on the main surface side, a plurality of second conductors arranged on the mounting surface side and extending linearly, and a plurality of third conductors connecting the first conductors and the second conductors, one end of the coil is connected to one of the external electrodes at a position closest to one of the side surfaces in the third direction, A coil component in which a first distance in the second direction between the second conductor closest to one of the side surfaces and a pair of the external electrodes is greater than a second distance in the second direction between the second conductor other than the second conductor closest to one of the side surfaces and closest to the pair of external electrodes in the second direction and the pair of external electrodes.

2. 2. The coil component according to claim 1, further comprising a connecting conductor that connects the first conductor, which is closest to one of the side surfaces and is connected to the second conductor, which is closest to one of the side surfaces, by the third conductor, and one of the external electrodes.

3. the other end of the coil is connected to the other external electrode at a position closest to the other side surface in the third direction, The coil component according to claim 1 , wherein a third distance in the second direction between the second conductor closest to the other side surface and the pair of external electrodes is greater than the second distance.

4. The coil component according to claim 3 , wherein the first distance and the third distance are the same.

5. 3. The coil component according to claim 1, wherein the second distance is the distance in the second direction between the second conductor arranged next to the second conductor closest to one of the side surfaces in the third direction and a pair of the external electrodes.

6. 3. The coil component according to claim 1, wherein a fifth distance in the second direction between the first conductor closest to one of the side surfaces and the second conductor closest to one of the side surfaces is equal to or greater than half of a sixth distance in the second direction between the first conductor other than the first conductor closest to one of the side surfaces and the second conductor other than the second conductor closest to one of the side surfaces.

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