Laminated coil component

Abstract

The laminated coil component includes an element body, a coil, an external electrode, and a connection conductor. The first coil conductor and the second coil conductor constitute a first connection portion. The plurality of coil conductors constitute a plurality of second connection portions. In the first connection portion, the first coil conductor and the second coil conductor overlap and are physically connected. In the plurality of second connection portions, adjacent coil conductors of the plurality of coil conductors overlap each other and are physically connected to each other. The first coil conductor has a path length that is longer than a path length of the second coil conductor. The area of the first connection portion viewed from one direction is larger than the smallest area among the areas of the plurality of second connection portions viewed from one direction.

Description

Technical Field

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

[0002] A stacked coil component is known (for example, Japanese Unexamined Patent Application Publication No. 2018-113309), which includes a body, a coil disposed in the body, an external electrode disposed on the surface of the body, and a connection conductor disposed in the body. The connection conductor electrically connects the coil and the external electrode to each other. The coil includes a first coil conductor located in the same layer as the connection conductor and a plurality of coil conductors arranged in one direction. The plurality of coil conductors includes a second coil conductor adjacent to the first coil conductor in one direction. Summary of the Invention

[0003] An object of an aspect of the present disclosure is to provide a stacked coil component capable of increasing the Q value.

[0004] A stacked coil component according to an aspect of the present disclosure includes: a body; a coil disposed in the body; an external electrode disposed on the surface of the body; and a connection conductor disposed in the body. The connection conductor electrically connects the coil and the external electrode to each other. The coil includes a first coil conductor and a plurality of coil conductors. The first coil conductor is located at an end of the coil and is included in the same layer as the connection conductor. The plurality of coil conductors includes a second coil conductor adjacent to the first coil conductor in one direction, and the plurality of coil conductors are arranged in the one direction. The first coil conductor has a path length longer than that of the second coil conductor. The first coil conductor and the second coil conductor form a first connection portion that overlaps and is physically connected to each other. Adjacent coil conductors among the plurality of coil conductors form a plurality of second connection portions that overlap and are physically connected to each other. The area obtained by observing the first connection portion from one direction is larger than the smallest area among the areas obtained by observing the plurality of second connection portions from one direction.

[0005] The Q value of the stacked coil component is proportional to the reciprocal of the resistance. The resistance of a coil including a plurality of coil conductors depends on the combined resistance of each coil conductor and the connection portions connecting adjacent coil conductors to each other. Since the resistance of a conductor is proportional to the length of the conductor and inversely proportional to the cross-sectional area of the conductor, the resistance among the plurality of coil conductors varies according to the path length of the coil conductors and the area where adjacent coil conductors overlap and are physically connected to each other. Therefore, the Q value of the stacked coil component depends on the path length of the plurality of coil conductors constituting the coil and the area of the connection portions.

[0006] In a stacked coil component, there are multiple inductance values with respect to specified external dimension requirements. Since the inductance value depends on the number of turns of the coil, it is difficult to determine the path length of each of the multiple coil conductors that make up the coil to be a fixed length. The path length of each of the multiple coil conductors is determined such that adjacent coil conductors do not form a loop with each other. Regarding the connection portion where a coil conductor having a longer path length than other coil conductors is connected to an adjacent coil conductor, it may have a larger area than the connection portions where other coil conductors are connected to each other.

[0007] In the above-described one mode, the first coil conductor is located at the end of the coil, so it is adjacent to a coil conductor in only one orientation in one direction. The first coil conductor is not adjacent to a coil conductor in the other orientation, so the path length is determined only in such a way that no loop is formed between it and the second coil conductor. The path length of the second coil conductor is determined such that no loop is formed between it and the first coil conductor and no loop is formed between it and a coil conductor adjacent in a different orientation from the first coil conductor. The path length of the first coil conductor is restricted less than the path length of the second coil conductor, so the path length of the first coil conductor can be extended compared to the path length of the second coil conductor. As a result, the first coil conductor has a longer path length than the second coil conductor.

[0008] The area obtained by observing the first connection portion from one direction is larger than the smallest area among the areas obtained by observing multiple second connection portions from one direction. Therefore, the resistance of the first connection portion is smaller than the resistance of the second connection portion having the smallest area among the multiple second connection portions. As a result, the combined resistance of the first coil conductor, the first connection portion, the multiple coil conductors, and the multiple second connection portions in the above-described one mode is smaller than the combined resistance in a structure where the first connection portion has an area equal to or smaller than the smallest area among the multiple second connection portions. Therefore, the above-described one mode can improve the Q value of the stacked coil component.

[0009] Another aspect of the stacked coil component of the present disclosure includes: a substrate; a coil disposed within the substrate; an external electrode disposed on the surface of the substrate; and a connection conductor disposed within the substrate. The connection conductor electrically connects the coil and the external electrode to each other. The coil includes a first coil conductor and a plurality of coil conductors. The first coil conductor is located at an end of the coil and is included in the same layer as the connection conductor. The plurality of coil conductors include a second coil conductor adjacent to the first coil conductor in one direction, and the plurality of coil conductors are arranged in the one direction. The first coil conductor has a path length longer than that of the second coil conductor. The first coil conductor and the second coil conductor form a first connection portion that overlaps and is physically connected to each other. Adjacent coil conductors among the plurality of coil conductors form a plurality of second connection portions that overlap and are physically connected to each other. The first connection portion has a path length longer than the shortest path length among the path lengths of the plurality of second connection portions.

[0010] The Q value of the stacked coil component is proportional to the reciprocal of the resistance. The resistance of a coil including a plurality of coil conductors depends on the combined resistance of the connection portions where adjacent coil conductors are connected to each other and the portions of the adjacent coil conductors that are not included in the connection portions. The resistance of a conductor is proportional to the length of the conductor and inversely proportional to the thickness of the conductor. The connection portion where adjacent coil conductors overlap and are physically connected to each other has a thickness greater than that of the portions of the adjacent coil conductors that are not included in the connection portion. Therefore, the connection portion where adjacent coil conductors overlap and are physically connected to each other has a resistance smaller than that of the portions of the adjacent coil conductors that are not included in the connection portion. As a result, the Q value of the stacked coil component depends on the path length of the connection portion where adjacent coil conductors are connected to each other and the path length of the portions of the adjacent coil conductors that are not included in the connection portion.

[0011] In the stacked coil component, multiple inductance values are required for a specified external dimension. Since the inductance value depends on the number of turns of the coil, it is difficult to determine the path lengths of the plurality of coil conductors that make up the coil to be fixed lengths. The path lengths of the plurality of coil conductors are determined such that adjacent coil conductors do not form a loop with each other. Regarding the connection portion where a coil conductor having a path length longer than that of other coil conductors is connected to an adjacent coil conductor, it may have a path length longer than that of the connection portions where other coil conductors are connected to each other.

[0012] In the above another manner, the first coil conductor is located at the end of the coil, so it is adjacent to the coil conductor in only one orientation in one direction. The first coil conductor is not adjacent to the coil conductor in the other orientation, so the path length is determined in such a way that no loop is formed only between it and the second coil conductor. The second coil conductor determines the path length in such a way that no loop is formed between it and the first coil conductor and no loop is formed between it and the coil conductor adjacent in an orientation different from that of the first coil conductor. The path length of the first coil conductor is restricted less than that of the second coil conductor, so the path length of the first coil conductor can be extended compared with the path length of the second coil conductor. As a result, the first coil conductor has a longer path length than the path length of the second coil conductor.

[0013] The first connection portion has a longer path length than the shortest path length among the path lengths of the plurality of second connection portions. For example, the shortest second connection portion has the shortest path length among the path lengths of the plurality of second connection portions. Therefore, the path lengths of the portions of the first coil conductor not included in the first connection portion and the portions of the second coil conductor not included in the first connection portion are shorter than the path lengths of the portions of the adjacent coil conductors not included in the shortest second connection portion. As a result, the combined resistance of the first coil conductor, the first connection portion, the plurality of coil conductors, and the plurality of second connection portions in the above one manner is smaller than the combined resistance in a structure where the first connection portion has a path length equal to or shorter than the path length of the shortest second connection portion. Therefore, the above one manner can improve the Q value of the stacked coil component.

[0014] The present disclosure can be more comprehensively understood through the following detailed description and the accompanying drawings, but these description and drawings are only examples and should not be regarded as a limitation to the present disclosure.

[0015] From the following detailed description, the further applicable scope of the present disclosure will become apparent. However, it should be understood that although the detailed description and specific embodiments give examples of the present disclosure, they are only for illustration, and various changes and modifications within the idea and scope of the present disclosure will be obvious to those skilled in the art based on this detailed description. Description of the Drawings

[0016] Figure 1 is a perspective view of a stacked coil component of an embodiment.

[0017] Figure 2 is a perspective view of the coil of the present embodiment.

[0018] Figure 3 is from Figure 1 the side 2e shown, a plan view of the coil of the present embodiment.

[0019] Figure 4 is a plan view of the coil of the present embodiment as viewed from the main surface 2b shown in Figure 1 Figure 4.

[0020] Figure 5 is an exploded view showing the structure of the stacked coil component of the present embodiment.

[0021] Figure 6 is a view showing adjacent coil conductors with respect to each other.

[0022] Figure 7 is a view showing another pair of adjacent coil conductors with respect to each other.

[0023] Figure 8 is a view showing yet another pair of adjacent coil conductors with respect to each other.

[0024] Figure 9 is a view showing yet another pair of adjacent coil conductors with respect to each other.

[0025] Figure 10 is a view showing yet another pair of adjacent coil conductors with respect to each other.

[0026] Figure 11 is a view showing yet another pair of adjacent coil conductors with respect to each other.

[0027] Figure 12 is an exploded view showing the structure of the stacked coil component according to a modified example of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the following description, the same elements or elements having the same functions are denoted by the same reference numerals, and redundant description is omitted.

[0029] Referring to Figures 1 to 4 FIG. 1, the structure of the stacked coil component 1 of the present embodiment will be described. Figure 1 is a perspective view of the stacked coil component of the present embodiment. Figure 2 is a perspective view of the coil of the present embodiment. Figure 3 is from Figure 1 a plan view of the coil of the present embodiment as viewed from the side surface 2e shown in Figure 4 is from Figure 1 a plan view of the coil of the present embodiment as viewed from the main surface 2b shown in FIG. 5. The stacked coil component 1 of the present embodiment is mounted on an electronic device by soldering. The electronic device includes, for example, a circuit board or electronic components.

[0030] As shown in Figure 1 and Figure 2As shown, the stacked coil component 1 includes a body 2, a coil 3 disposed within the body 2, a pair of external electrodes 41 and 42 disposed on the surface of the body 2, and a pair of connection conductors 51 and 52 disposed within the body 2. The external electrodes 41 and 42 are electrically connected to the coil 3. The body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes the shape of a rectangular parallelepiped with chamfered corners and ridge lines, and the shape of a rectangular parallelepiped with rounded corners and ridge lines.

[0031] The body 2 includes a pair of main surfaces 2a and 2b that face each other, a pair of side surfaces 2c and 2d, and a pair of side surfaces 2e and 2f. The main surfaces 2a and 2b, the side surfaces 2c and 2d, and the side surfaces 2e and 2f are rectangular. The main surfaces 2a and 2b are adjacent to the side surfaces 2c and 2d and the side surfaces 2e and 2f. The side surfaces 2c and 2d are adjacent to each other. When the stacked coil component 1 is welded and mounted on an electronic device, the main surface 2a faces the electronic device to which it is welded and mounted. The main surfaces 2a and 2b, the side surfaces 2c and 2d, and the side surfaces 2e and 2f are planes. A plane refers to a surface formed as a target plane and is not limited to a geometrically perfect plane. The plane may include bends and unevenness generated during the manufacturing process.

[0032] The directions D3 in which the pair of main surfaces 2a and 2b face each other are orthogonal to the main surfaces 2a and 2b, respectively. The directions D1 in which the pair of side surfaces 2c and 2d face each other are orthogonal to the side surfaces 2c and 2d, respectively. The directions D2 in which the pair of side surfaces 2e and 2f face each other are orthogonal to the side surfaces 2e and 2f, respectively. The direction D3 is orthogonal to the directions D1 and D2. The directions D1 and D2 are orthogonal to each other. A pair of depressions corresponding to the pair of external electrodes 41 and 42 are formed in the body 2.

[0033] When viewed from the direction D1, the external electrodes 41 and 42 have an L-shaped cross section. When viewed from the direction D1, the depressions formed in the body 2 corresponding to the external electrodes 41 and 42 have an L-shaped cross section. The external electrode 41 includes a portion 41a and a portion 41b. The surface of the portion 41a faces the same direction as the side surface 2e, and the surface of the portion 41b faces the same direction as the main surface 2a. The portion 41a and the portion 41b are connected along the ridge line portion between the side surface 2e and the main surface 2a. The external electrode 42 includes a portion 42a and a portion 42b. The surface of the portion 42a faces the same direction as the side surface 2f, and the surface of the portion 42b faces the same direction as the main surface 2a. The portion 42a and the portion 42b are connected along the ridge line portion between the side surface 2f and the main surface 2a.

[0034] In the present embodiment, the length of the external electrodes 41 and 42 in the direction D3 is longer than the length of the external electrodes 41 and 42 in the direction D2. The portions 41b and 42b are configured to be exposed with the same orientation as the main surface 2a. The surfaces of the portions 41b and 42b and the main surface 2a may be in the same plane. The surfaces of the portions 41b and 42b may also protrude from the main surface 2a. The portion 41a is configured to be exposed with the same orientation as the side surface 2e. The surface of the portion 41a and the side surface 2e may be in the same plane. The surface of the portion 41a may also protrude from the side surface 2e. The portion 42a is disposed on the side surface 2f and is exposed with the same orientation as the side surface 2f. The surface of the portion 42a and the side surface 2f may be in the same plane. The surface of the portion 42a may also protrude from the side surface 2f. In the present embodiment, the length of the portions 41a and 42a in the direction D3 is longer than the length of the portions 41b and 42b in the direction D2.

[0035] As Figures 2 to 4 shown, the coil 3 includes coil conductors 31 and 37 and a plurality of coil conductors 30. The coil conductors 31 and 37 are electrically connected to each other and to the plurality of coil conductors 30. The number of turns of the coil 3 is 2.5 turns. The coil conductors 31 and 37 and each of the coil conductors 30 form a part of the annular track in the coil 3. The coil conductors 31 and 37 and each of the coil conductors 30 are, for example, in a shape in which a part of a loop is interrupted. The coil conductors 31 and 37 and each of the coil conductors 30 have a path length and a thickness, respectively.

[0036] The coil conductors 31 and 37 are located at the ends of the coil 3. In the present embodiment, the coil conductor 31 is located at one end of the coil 3 in the direction D1, and the coil conductor 37 is located at the other end of the coil 3 in the direction D1. The coil conductor 31 is included in the same layer as the connection conductor 51, and the coil conductor 37 is included in the same layer as the connection conductor 52. The plurality of coil conductors 30 are arranged in the direction D1. The plurality of coil conductors 30 include coil conductors 32, 33, 34, 35, and 36 arranged in sequence along the direction D1. The coil conductor 32 is adjacent to the coil conductor 31 in the direction D1, and the coil conductor 36 is adjacent to the coil conductor 37 in the direction D1. The coil conductors 32 and 36 are adjacent to the coil conductors 31 and 37 in the direction D1. The coil conductors 31 and 37 are defined as the first coil conductors. The coil conductors 32 and 36 are defined as the second coil conductors.

[0037] The widths of the coil conductors 31, 37 and each coil conductor 30 in the direction orthogonal to the path are equal to each other. The thicknesses of the coil conductors 31, 37 and each coil conductor 30 are equal to each other. In this specification, "equal" does not necessarily mean that the values are identical. When there are minute differences, manufacturing errors or measurement errors within a preset range in the values, they can also be regarded as equal values. The layers of the coil conductors 31, 37 and each of the coil conductors 32 - 36 respectively correspond to the layers constituting the laminated coil component 1. The layers of the coil conductors 31, 37 and each of the coil conductors 32 - 36 extend along a plane intersecting the direction D1 in which the coil conductors 31, 37 and each of the coil conductors 32 - 36 are arranged. In the present embodiment, the layers of the coil conductors 31, 37 and each of the coil conductors 32 - 36 extend along the direction D2 and the direction D3.

[0038] The coil conductors 31, 37 and each of the coil conductors 32 - 36 include a first end corresponding to one end of a shape in which a part of the loop is interrupted, and a second end corresponding to the other end of a shape in which a part of the loop is interrupted. The coil conductors 31, 37 and each of the coil conductors 32 - 36 extend along a path from the first end to the second end in their respective layers. The length of the path of the coil conductors 31, 37 and each of the coil conductors 32 - 36 from the first end to the second end is referred to as the path length of the coil conductors 31, 37 and each of the coil conductors 32 - 36.

[0039] The connection conductor 51 electrically connects the coil 3 and the external electrode 41 to each other. The coil 3 and the external electrode 41 are physically connected to each other via the connection conductor 51. The connection conductor 51 is connected to the coil conductor 31 in the same layer as the coil conductor 31. The connection conductor 51 extends between the first end of the coil conductor 31 and the portion 41a of the external electrode 41. The thickness of the connection conductor 51 is equal to the thickness of the coil conductor 31. The connection conductor 52 electrically connects the coil 3 and the external electrode 42 to each other. The coil 3 and the external electrode 42 are physically connected to each other via the connection conductor 52. The connection conductor 52 is connected to the coil conductor 37 in the same layer as the coil conductor 37. The connection conductor 52 extends between the second end of the coil conductor 37 and the portion 42a of the external electrode 42. The thickness of the connection conductor 52 is equal to the thickness of the coil conductor 37. The thicknesses of the connection conductor 51 and the connection conductor 52 are equal to each other.

[0040] Figure 5 is an exploded view showing the structure of the laminated coil component 1 of the present embodiment. In the present embodiment, the lamination direction of the laminated coil component 1 is along the direction D1. Figure 5Shows a plurality of layers constituting the laminated coil component 1 as viewed from the direction D1. The plurality of layers constituting the laminated coil component 1 include the layer constituting the body 2, the layer constituting the coil 3, the layers constituting the external electrodes 41 and 42, and the layers constituting the connection conductors 51 and 52. The thicknesses of the plurality of layers are equal to each other. Hereinafter, with reference to Figure 5 , the body 2, the coil 3, the external electrodes 41 and 42, and the connection conductors 51 and 52 will be described.

[0041] The body 2 is composed of a plurality of laminated insulator layers 20. In the present embodiment, the number of the plurality of insulator layers 20 is "9". Figure 5 Seven insulator layers 20 are shown in which one insulator layer 20 at each of the two ends in the direction D1 is omitted. In the actual body 2, the respective insulator layers 20 are integrated to such an extent that the boundaries between the respective insulator layers 20 cannot be visually recognized. Each insulator layer 20 is made of a non-magnetic material, for example. The non-magnetic material includes, for example, a glass-ceramic material or a dielectric material. In the present embodiment, each insulator layer 20 is composed of a sintered body of a green sheet containing a non-magnetic material. Each insulator layer 20 may also be made of a magnetic material.

[0042] The external electrodes 41 and 42 are each composed of a plurality of laminated electrode layers 410 and 420, respectively. In the present embodiment, the number of the plurality of electrode layers 410 and 420 is "7" each. In the actual external electrode 41, the respective electrode layers 410 are integrated to such an extent that the boundaries between the respective electrode layers 410 cannot be visually recognized. In the actual external electrode 42, the respective electrode layers 420 are integrated to such an extent that the boundaries between the respective electrode layers 420 cannot be visually recognized. The respective electrode layers 410 and 420 are provided in the defective portions formed in the corresponding insulator layers 20. By the defective portions formed in the respective insulator layers 20, a pair of recesses corresponding to the external electrodes 41 and 42 can be obtained. Each electrode layer 410 and 420 is made of a conductive material, for example. The conductive material includes, for example, Ag or Pd. In the present embodiment, each electrode layer 410 and 420 is composed of a sintered body of a conductive paste containing a conductive material powder.

[0043] The connection conductors 51 and 52 are each composed of electrode layers 510 and 520, respectively. The electrode layer 510 is connected to the coil conductor layer 310, and the electrode layer 520 is connected to the coil conductor layer 370. The respective electrode layers 510 and 520 are provided in the defective portions formed in the corresponding insulator layers 20. Each electrode layer 510 and 520 is made of the same material as the respective electrode layers 410 and 420, for example. Each electrode layer 510 and 520 is composed of a sintered body of a conductive paste, for example.

[0044] The coil 3 is composed of a plurality of coil conductor layers. The coil conductor 31 is composed of the coil conductor layer 310. The coil conductor 32 is composed of the coil conductor layer 320. The coil conductor 33 is composed of the coil conductor layer 330. The coil conductor 34 is composed of the coil conductor layer 340. The coil conductor 35 is composed of the coil conductor layer 350. The coil conductor 36 is composed of the coil conductor layer 360. The coil conductor 37 is composed of the coil conductor layer 370. Each of the coil conductor layers 310 to 370 is disposed in a defective portion formed in the corresponding insulator layer 20. Each of the coil conductor layers 310 to 370 is made of, for example, the same material as each of the electrode layers 410 and 420. Each of the coil conductor layers 310 to 370 is made of, for example, a sintered body of a conductive paste.

[0045] The following will refer to Figure 2 and Figures 5 to 11 to describe the coil 3. As Figure 5 shown, the coil conductor layers 310 to 370 respectively correspond to the coil conductor 31, the coil conductors 32 to 36, and the coil conductor 37 as observed from the direction D1. Figure 6 FIG. is a view showing adjacent coil conductors 31 and 32. Figure 7 FIG. is a view showing adjacent coil conductors 32 and 33. Figure 8 FIG. is a view showing adjacent coil conductors 33 and 34. Figure 9 FIG. is a view showing adjacent coil conductors 34 and 35. Figure 10 FIG. is a view showing adjacent coil conductors 35 and 36. Figure 11 FIG. is a view showing adjacent coil conductors 36 and 37.

[0046] As observed from the direction D1, the coil 3 has a pentagonal shape. This pentagon is line-symmetric in the direction D2 with respect to the center line along the direction D3. This pentagon includes: a first side closest to the main surface 2b, a second side closest to the side surface 2f, a third side and a fourth side closest to the main surface 2a, and a fifth side closest to the side surface 2e. The first side and the second side are connected at a first vertex, the second side and the third side are connected at a second vertex, the third side and the fourth side are connected at a third vertex, the fourth side and the fifth side are connected at a fourth vertex, and the fifth side and the first side are connected at a fifth vertex. With respect to the center line passing through the third vertex between the third side and the fourth side, the second side and the fifth side are line-symmetric to each other, and the third side and the fourth side are line-symmetric to each other. The first side is longer than each of the second side and the fifth side. Each of the second side and the fifth side is longer than each of the third side and the fourth side.

[0047] As Figure 6As shown, the path of the coil conductor 31 includes a part of the fifth side, the first side, the second side, the third side, the fourth side, and another part of the fifth side. The coil conductor 31 extends along the path from the end 31a to the end 31b. The path of the coil conductor 31 is illustrated by a double-dashed line connecting the end 31a and the end 31b. The path length of the coil conductor 31 is more than half a turn. The path of the coil conductor 32 includes a part of the first side, the second side, the third side, the fourth side, and a part of the fifth side. The coil conductor 32 extends along the path from the end 32a to the end 32b. The path of the coil conductor 32 is illustrated by a double-dashed line connecting the end 32a and the end 32b. The path length of the coil conductor 32 is more than half a turn.

[0048] The coil conductor 31 and the coil conductor 32 are adjacent to each other in the direction D1. The coil conductor 31 and the coil conductor 32 form a connecting portion 3a that overlaps and is physically connected to each other. In the connecting portion 3a, the portion of the coil conductor 31 including the end 31b overlaps with the portion of the coil conductor 32 including the end 32a in the direction D1. In the present embodiment, in the connecting portion 3a, the portion of the coil conductor 31 including the end 31b overlaps with the whole of the coil conductor 32 in the direction D1. In one example, in the connecting portion 3a, the end 31b of the coil conductor 31 overlaps with the end 32b of the coil conductor 32 in the direction D1. The connecting portion 3a includes the whole of the coil conductor 32. The area obtained by observing the connecting portion 3a from the direction D1 includes the area Sa.

[0049] The path of the connecting portion 3a includes a part of the first side, the second side, the third side, the fourth side, and a part of the fifth side. The path of the connecting portion 3a is the same as the path of the coil conductor 32. The path of the connecting portion 3a is illustrated by a double-dashed line connecting the end 32a and the end 31b. When observed from the direction D1, the connecting portion 3a bends between the first side and the second side, between the second side and the third side, between the third side and the fourth side, and between the fourth side and the fifth side. The connecting portion 3a is defined as the first connecting portion.

[0050] As Figure 7 shown, the path of the coil conductor 33 includes a part of the second side, the third side, the fourth side, the fifth side, and a part of the first side. The coil conductor 33 extends along the path from the end 33a to the end 33b. The path of the coil conductor 33 is illustrated by a double-dashed line connecting the end 33a and the end 33b. The path length of the coil conductor 33 is more than half a turn.

[0051] The coil conductors 32 and 33 are adjacent to each other in the direction D1. The coil conductors 32 and 33 form a connecting portion 3b that overlaps and is physically connected to each other. In the connecting portion 3b, the portion of the coil conductor 32 including the end portion 32b overlaps with the portion of the coil conductor 33 including the end portion 33a in the direction D1. The area obtained by observing the connecting portion 3b from the direction D1 includes the area Sb.

[0052] The path of the connecting portion 3b includes a part of the second side, the third side, the fourth side, and a part of the fifth side. The path of the connecting portion 3b is illustrated by a double-dot dash line connecting the end portion 33a and the end portion 32b. When observed from the direction D1, the connecting portion 3b bends between the second side and the third side, between the third side and the fourth side, and between the fourth side and the fifth side. The connecting portion 3b is defined as the second connecting portion.

[0053] As Figure 8 shown, the path of the coil conductor 34 includes a part of the fifth side, the first side, and a part of the second side. The coil conductor 34 extends along the path from the end portion 34a to the end portion 34b. The path of the coil conductor 34 is illustrated by a double-dot dash line connecting the end portion 34a and the end portion 34b. The path length of the coil conductor 34 is less than or equal to 1 / 2 turn.

[0054] The coil conductors 33 and 34 are adjacent to each other in the direction D1. The coil conductors 33 and 34 form a connecting portion 3c that overlaps and is physically connected to each other. In the connecting portion 3c, the portion of the coil conductor 33 including the end portion 33b overlaps with the portion of the coil conductor 34 including the end portion 34a in the direction D1. The area obtained by observing the connecting portion 3c from the direction D1 includes the area Sc.

[0055] The path of the connecting portion 3c includes a part of the fifth side and a part of the first side. The path of the connecting portion 3c is illustrated by a double-dot dash line connecting the end portion 34a and the end portion 33b. When observed from the direction D1, the connecting portion 3c bends between the fifth side and the first side. The connecting portion 3c is defined as the second connecting portion.

[0056] As Figure 9 shown, the path of the coil conductor 35 includes a part of the first side, the second side, the third side, the fourth side, and a part of the fifth side. The coil conductor 35 extends along the path from the end portion 35a to the end portion 35b. The path of the coil conductor 35 is illustrated by a double-dot dash line connecting the end portion 35a and the end portion 35b. The path length of the coil conductor 35 is greater than or equal to 1 / 2 turn. The coil conductor 35 and the coil conductor 32 have the same shape.

[0057] The coil conductors 34 and 35 are adjacent to each other in the direction D1. The coil conductors 34 and 35 form a connection part 3d that overlaps and is physically connected to each other. In the connection part 3d, the part of the coil conductor 34 including the end 34b overlaps with the part of the coil conductor 35 including the end 35a in the direction D1. The area obtained by observing the connection part 3d from the direction D1 includes the area Sd.

[0058] The path of the connection part 3d includes a part of the first side and a part of the second side. The path of the connection part 3d is illustrated by a double-dot dash line connecting the end 35a and the end 34b. When observed from the direction D1, the connection part 3d bends between the first side and the second side. The connection part 3d is defined as the second connection part.

[0059] As Figure 10 shown, the path of the coil conductor 36 includes a part of the second side, the third side, the fourth side, the fifth side, and a part of the first side. The coil conductor 36 extends along the path from the end 36a to the end 36b. The path of the coil conductor 36 is illustrated by a double-dot dash line connecting the end 36a and the end 36b. The path length of the coil conductor 36 is more than 1 / 2 turn. The coil conductor 36 and the coil conductor 33 have the same shape.

[0060] The coil conductors 35 and 36 are adjacent to each other in the direction D1. The coil conductors 35 and 36 form a connection part 3e that overlaps and is physically connected to each other. In the connection part 3e, the part of the coil conductor 35 including the end 35b overlaps with the part of the coil conductor 36 including the end 36a in the direction D1. The area obtained by observing the connection part 3e from the direction D1 includes the area Se. The connection part 3e and the connection part 3b have the same shape.

[0061] The path of the connection part 3e includes a part of the second side, the third side, the fourth side, and a part of the fifth side. The path of the connection part 3e is illustrated by a double-dot dash line connecting the end 36a and the end 35b. When observed from the direction D1, the connection part 3e bends between the second side and the third side, between the third side and the fourth side, and between the fourth side and the fifth side. The connection part 3e is defined as the second connection part.

[0062] As Figure 11 shown, the path of the coil conductor 37 includes a part of the second side, the third side, the fourth side, the fifth side, the first side, and another part of the second side. The coil conductor 37 extends along the path from the end 37a to the end 37b. The path of the coil conductor 37 is illustrated by a double-dot dash line connecting the end 37a and the end 37b. The path length of the coil conductor 31 is more than 1 / 2 turn.

[0063] The coil conductors 36 and 37 are adjacent to each other in the direction D1. The coil conductors 36 and 37 form a connecting portion 3f that overlaps and is physically connected to each other. In the connecting portion 3f, the portion of the coil conductor 36 including the end portion 36b overlaps with the portion of the coil conductor 37 including the end portion 37a in the direction D1. In the present embodiment, in the connecting portion 3f, the portion of the coil conductor 37 including the end portion 37a overlaps with the whole of the coil conductor 36 in the direction D1. In one example, in the connecting portion 3f, the end portion 36a of the coil conductor 36 overlaps with the end portion 37a of the coil conductor 37 in the direction D1. The connecting portion 3f includes the whole of the coil conductor 36. The area obtained by observing the connecting portion 3f from the direction D1 includes the area Sf.

[0064] The path of the connecting portion 3f includes a part of the second side, the third side, the fourth side, the fifth side, and a part of the first side. The path of the connecting portion 3f is the same as the path of the coil conductor 36. The path of the connecting portion 3f is illustrated by a double-dot dash line connecting the end portion 37a and the end portion 36b. Observed from the direction D1, the connecting portion 3f bends between the second side and the third side, between the third side and the fourth side, between the fourth side and the fifth side, and between the fifth side and the first side. The connecting portion 3f is defined as the first connecting portion.

[0065] As described above, the connecting portions 3a and 3f are defined as the first connecting portions, and the connecting portions 3b, 3c, 3d, and 3e are defined as a plurality of second connecting portions. In this specification, "overlap" is not limited to a structure in which the outer shapes of the overlapping portions are the same. The portions of the coil conductors 31 to 36 including the end portions 31b to 36b and the portions of the coil conductors 32 to 37 including the end portions 32a to 37a may also include portions that do not overlap in the direction D1. The portions of the coil conductors 31 to 36 including the end portions 31b to 36b and the portions of the coil conductors 32 to 37 including the end portions 32a to 37a may include portions that are not included in the connecting portions 3a to 3f.

[0066] The area Sa of the connecting portion 3a and the area Sf of the connecting portion 3f may be equal to each other. The area Sb of the connecting portion 3b and the area Se of the connecting portion 3e may be equal to each other. The area Sc of the connecting portion 3c and the area Sd of the connecting portion 3d may be equal to each other. The areas Sc and Sd are the smallest among the areas Sb, Sc, Sd, and Se. The areas Sa and Sf are larger than the areas Sc and Sd. The areas Sa and Sf are larger than any one of the areas Sb, Sc, Sd, and Se.

[0067] The path lengths of the connection portions 3a and 3f can be equal to each other. The path lengths of the connection portions 3b and 3e can be equal to each other. The path lengths of the connection portions 3c and 3d can be equal to each other. The path lengths of the connection portions 3c and 3d are the smallest among the path lengths of the connection portions 3b, 3c, 3d, and 3e. The path lengths of the connection portions 3a and 3f are larger than the path lengths of the connection portions 3c and 3d. The path lengths of the connection portions 3a and 3f are greater than any one of the path lengths of the connection portions 3b, 3c, 3d, and 3e.

[0068] As described above, in the stacked coil component 1, the coil conductors 31 and 37 are located at the ends of the coil 3, so they are adjacent to the coil conductors in only one orientation in the direction D1. The coil conductors 31 and 37 are not adjacent to the coil conductors in the other orientation, so the path lengths are determined in such a way that no loop is formed only between them and the coil conductors 32 and 36. The coil conductors 32 and 36 determine the path lengths in such a way that no loop is formed between them and the coil conductors 31 and 37, and no loop is formed between them and the coil conductors 33 and 35. The path lengths of the coil conductors 31 and 37 are less restricted than the path lengths of the coil conductors 32 and 36. Therefore, the path lengths of the coil conductors 31 and 37 can be extended compared to the path lengths of the coil conductors 32 and 36. As a result, the coil conductors 31 and 37 have path lengths longer than those of the coil conductors 32 and 36.

[0069] The areas Sa and Sf of the connection portions 3a and 3f are larger than the smallest areas Sc and Sd among the areas Sb, Sc, Sd, and Se of the plurality of connection portions 3b, 3c, 3d, and 3e. Therefore, the resistance of the connection portions 3a and 3f is less than the resistance of the connection portions 3c and 3d having the smallest area. As a result, the combined resistance of the coil conductors 31 and 37, the connection portions 3a and 3f, the plurality of coil conductors 30, and the plurality of connection portions 3b, 3c, 3d, and 3e in the above-described one mode is smaller than the combined resistance in a structure where the connection portions 3a and 3f have an area equal to or smaller than the area of the connection portions 3c and 3d. Therefore, the stacked coil component 1 can improve the Q value of the stacked coil component.

[0070] In the stacked coil component 1, the area obtained by observing the connection portions 3a and 3f from the direction D1 is larger than any one of the areas obtained by observing the plurality of connection portions 3b, 3c, 3d, and 3e from one direction.

[0071] In a structure where the connection portions 3a and 3f have an area larger than any one of the areas of the plurality of connection portions 3b, 3c, 3d, and 3e, the resistance of the connection portions 3a and 3f is smaller than the resistance of any one of the plurality of connection portions 3b, 3c, 3d, and 3e. Therefore, the stacked coil component 1 can further improve the Q value of the stacked coil component.

[0072] In the stacked coil component 1, the coil conductors 31 and 37 are located at the ends of the coil 3, so they are adjacent to the coil conductors in only one orientation in the direction D1. The coil conductors 31 and 37 are not adjacent to the coil conductors in the other orientation, so the path lengths are determined in such a way that no loop is formed only between them and the coil conductors 32 and 36. The coil conductors 32 and 36 determine the path lengths in such a way that no loop is formed between them and the coil conductors 31 and 37, and no loop is formed between them and the coil conductors 33 and 35. The path lengths of the coil conductors 31 and 37 are less restricted than the path lengths of the coil conductors 32 and 36. Therefore, compared with the path lengths of the coil conductors 32 and 36, the path lengths of the coil conductors 31 and 37 can be extended. As a result, the coil conductors 31 and 37 have path lengths longer than those of the coil conductors 32 and 36.

[0073] The connection portions 3a and 3f have path lengths longer than the shortest path length among the path lengths of the plurality of connection portions 3b, 3c, 3d, and 3e. In the stacked coil component 1, the connection portions 3c and 3d have the shortest path lengths among the plurality of connection portions 3b, 3c, 3d, and 3e. Therefore, the path lengths of the portions of the coil conductors 31 and 37 that are not included in the connection portions 3a and 3f, and the path lengths of the portions of the coil conductors 32 and 36 that are not included in the connection portions 3a and 3f, are shorter than the path lengths of the portions of the adjacent coil conductors 33, 34, and 35 that are not included in the connection portions 3c and 3d. As a result, the combined resistance of the coil conductors 31 and 37, the connection portions 3a and 3f, the plurality of coil conductors 30, and the plurality of connection portions 3b, 3c, 3d, and 3e in the above one mode is smaller than the combined resistance in a structure where the connection portions 3a and 3f have a path length equal to or shorter than the path length of the connection portions 3c and 3d. Therefore, the above one mode can improve the Q value of the stacked coil component.

[0074] The path lengths of the connection portions 3a and 3f are longer than any of the path lengths of the plurality of connection portions 3b, 3c, 3d, and 3e.

[0075] In a structure where the connection portions 3a and 3f have path lengths longer than any of the path lengths of the plurality of connection portions 3b, 3c, 3d, and 3e, the path lengths of the portions of the coil conductors 31 and 37 that are not included in the connection portions 3a and 3f, and the path lengths of the portions of the coil conductors 32 and 36 that are not included in the connection portions 3a and 3f, are shorter than the path lengths of the portions of the adjacent coil conductors of the plurality of coil conductors 30 that are not included in the connection portions 3b, 3c, 3d, and 3e. Therefore, the stacked coil component 1 can further improve the Q value of the stacked coil component.

[0076] The coil conductors 31 and 37 have path lengths longer than those of the plurality of coil conductors 30.

[0077] A structure in which the path lengths of the coil conductors 31 and 37 are longer than any of the path lengths of the plurality of coil conductors 30 can easily ensure the areas of the connection portions 3a and 3f and can easily ensure the path lengths of the connection portions 3a and 3f.

[0078] The connection portion 3a includes the entire coil conductor 32, and the connection portion 3f includes the entire coil conductor 36.

[0079] A structure in which the connection portions 3a and 3f include the entire coil conductors 32 and 36 can easily ensure the areas of the connection portions 3a and 3f and can easily ensure the path lengths of the connection portions 3a and 3f.

[0080] The connection portions 3a and 3f are curved when viewed from the direction D1.

[0081] At a portion where the coil conductor is bent, the impedance is discontinuous, so that losses caused by reflection of high-frequency current may occur at the bent portion of the coil conductor. Compared with a structure in which the coil conductor is bent when viewed from the direction D1, the structure in which the connection portions 3a and 3f are bent when viewed from the direction D1 has a thickness in the direction D1, so that losses are not easily generated.

[0082] Figure 12 FIG. is an exploded view showing the structure of a stacked coil component according to a modified example of the present embodiment. The stacked coil component of the modified example includes a coil 6 instead of the coil 3. The following refers to Figure 12 The coil 6 will be described. The differences between the above-described embodiment and this modified example will be mainly described below. The coil 6 includes coil conductors 61 and 67 and a plurality of coil conductors 62 to 66. As Figure 12 shown, the coil conductor layers 610 to 670 respectively correspond to the coil conductor 61, the coil conductors 62 to 66, and the coil conductor 67 when viewed from the direction D1.

[0083] When viewed from the direction D1, the coil 6 has a circular shape. The number of turns of the coil 6 is 2.5 turns. The coil conductors 61 and 67 and each of the coil conductors 62 to 66 form a part of a circular track in the coil 6. The coil conductors 61 and 67 and each of the coil conductors 62 to 66 are, for example, arc-shaped. The coil conductors 61 and 67 and each of the coil conductors 62 to 66 have equal thicknesses.

[0084] The coil conductors 61 and 67 are located at the ends of the coil 6. The coil conductor 61 is located at one end of the coil 6 in the direction D1, and the coil conductor 67 is located at the other end of the coil 6 in the direction D1. The coil conductor 61 is included in the same layer as the connection conductor 51, and the coil conductor 67 is included in the same layer as the connection conductor 52. A plurality of coil conductors 62, 63, 64, 65, 66 are arranged in sequence along the direction D1. The coil conductor 62 is adjacent to the coil conductor 61 in the direction D1, and the coil conductor 66 is adjacent to the coil conductor 67 in the direction D1.

[0085] The path lengths of the coil conductors 61 to 63 are 1 / 2 turn or more. The path length of the coil conductor 64 is less than 1 / 2 turn. The path lengths of the coil conductors 65 and 67 are 1 / 2 turn or more. The path lengths of the coil conductors 61 and 67 may be equal to each other. The path lengths of the coil conductors 62, 66, 65, 66 may be equal to each other. The coil conductor 61 has a longer path length than the coil conductor 62. The coil conductor 67 has a longer path length than the coil conductor 66. The coil conductors 61 and 67 have a longer path length than the path lengths of the plurality of coil conductors 62 to 66. The coil conductor 64 has the shortest path length among the path lengths of the plurality of coil conductors 62 to 66.

[0086] As Figure 12 shown, the coil 6 includes connecting portions 6a, 6b, 6c, 6d, 6e, 6f. When viewed from the direction D1, the connecting portions 6a, 6b, 6c, 6d, 6e, 6f are bent. When viewed from the direction D1, the connecting portions 6a, 6b, 6c, 6d, 6e, 6f are, for example, arc-shaped.

[0087] In the connecting portion 6a, the coil conductor 61 and the coil conductor 62 overlap and are physically connected. The connecting portion 6a includes the entirety of the coil conductor 62.

[0088] In the connecting portion 6b, the adjacent coil conductors 62 and 63 overlap and are physically connected. In the connecting portion 6c, the adjacent coil conductors 63 and 64 overlap and are physically connected. In the connecting portion 6d, the adjacent coil conductors 64 and 65 overlap and are physically connected. In the connecting portion 6e, the adjacent coil conductors 65 and 66 overlap and are physically connected.

[0089] In the connecting portion 6f, the coil conductor 66 and the coil conductor 67 overlap and are physically connected. The connecting portion 6f includes the entirety of the coil conductor 66.

[0090] The connecting portions 6a and 6f are defined as first connecting portions, and the connecting portions 6b, 6c, 6d, 6e are defined as a plurality of second connecting portions.

[0091] The areas of the connecting portions 6a and 6f may be equal to each other. The areas of the connecting portions 6b and 6e may be equal to each other. The areas of the connecting portions 6c and 6d may be equal to each other. The areas of the connecting portions 6c and 6d are the smallest among the areas of the connecting portions 6b, 6c, 6d, and 6e. The areas of the connecting portions 6a and 6f are larger than the areas of the connecting portions 6c and 6d. The areas of the connecting portions 6a and 6f are larger than any one of the areas of the connecting portions 6b, 6c, 6d, and 6e.

[0092] The path lengths of the connecting portions 6a and 6f may be equal to each other. The path lengths of the connecting portions 6b and 6e may be equal to each other. The path lengths of the connecting portions 6c and 6d may be equal to each other. The path lengths of the connecting portions 6c and 6d are the smallest among the path lengths of the connecting portions 6b, 6c, 6d, and 6e. The path lengths of the connecting portions 6a and 6f are larger than the path lengths of the connecting portions 6c and 6d. The path lengths of the connecting portions 6a and 6f are larger than any one of the path lengths of the connecting portions 6b, 6c, 6d, and 6e.

[0093] The present disclosure has been described in detail based on its embodiments. However, the present disclosure is not limited to the above embodiments. The present disclosure can be variously modified without departing from its gist. The present disclosure can also be composed of, for example, the above embodiments and modification examples combined.

[0094] The coil 3 may only include the coil conductors 31 and 32. The coil 3 may only include the coil conductors 37 and 36. In the present embodiment, the coil 3 includes the coil conductors 31, 37 and the coil conductors 32, 36, forming two connecting portions 3a and 3f. Therefore, the laminated coil component 1 can further improve the Q value of the laminated coil component.

[0095] The path length may be the minimum length from the end face of the first end to the end face of the second end of the coil conductors 31, 37 and each of the coil conductors 32 to 36. For example, the path length may be the inner circumference from the end face of the first end to the end face of the second end of the coil conductors 31, 37 and each of the coil conductors 32 to 36.

[0096] The connecting portion 3a may not include the entire coil conductor 32. The connecting portion 3f may not include the whole of the coil conductor 36.

Claims

1. A laminated coil component, wherein: have: body; A coil disposed in the body; An external electrode disposed on the surface of the element body; and a connecting conductor disposed in the element body and electrically connecting the coil and the external electrode to each other, The coil comprises: a first coil conductor located at an end of the coil and included in the same layer as the connecting conductor; and a plurality of coil conductors including a second coil conductor adjacent to the first coil conductor in one direction, and the plurality of coil conductors are arranged in the one direction, the first coil conductor having a path length longer than a path length of the second coil conductor, The first coil conductor and the second coil conductor constitute a first connection portion that overlaps and is physically connected to each other. Adjacent coil conductors among the plurality of coil conductors constitute a plurality of second connection portions that overlap and are physically connected to each other. An area of ​​the first connection portion observed from the one direction is larger than a smallest area of ​​the areas of the plurality of second connection portions observed from the one direction.

2. The laminated coil component according to claim 1, wherein: The area of ​​the first connection portion observed from the one direction is larger than any of the areas of the plurality of second connection portions observed from the one direction.

3. A laminated coil component, wherein: have: body; A coil disposed in the body; An external electrode disposed on the surface of the element body; and a connecting conductor disposed in the element body and electrically connecting the coil and the external electrode to each other, The coil comprises: a first coil conductor located at an end of the coil and included in the same layer as the connecting conductor; and a plurality of coil conductors including a second coil conductor adjacent to the first coil conductor in one direction, and the plurality of coil conductors are arranged in the one direction, the first coil conductor having a path length longer than a path length of the second coil conductor, The first coil conductor and the second coil conductor constitute a first connection portion that overlaps and is physically connected to each other. Adjacent coil conductors among the plurality of coil conductors constitute a plurality of second connection portions that overlap and are physically connected to each other. The first connection portion has a path length longer than a shortest path length among path lengths of the plurality of second connection portions.

4. The laminated coil component according to claim 3, wherein: The path length of the first connection portion is longer than any of the path lengths of the plurality of second connection portions.

5. The laminated coil component according to any one of claims 1 to 4, wherein The first coil conductor has the path length that is longer than any of the path lengths of the plurality of coil conductors.

6. The laminated coil component according to any one of claims 1 to 5, wherein The first connecting portion includes the entire second coil conductor.

7. The laminated coil component according to any one of claims 1 to 6, wherein When viewed from the one direction, the first connection portion is curved.

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