Laminated coil component

Abstract

A laminated coil component is provided with: an element body having a first main surface and a second main surface facing each other, a first end surface and a second end surface facing each other, and a first side surface and a second side surface facing each other; a first external electrode and a second external electrode disposed on the first main surface; and a coil having a first end connected to the first external electrode and a second end connected to the second external electrode. A coil axis of the coil extends in a direction in which the first side surface and the second side surface face each other, and the coil has a plurality of coil conductors and a through-hole conductor connecting the plurality of coil conductors to each other. The number of the via conductors disposed closer to the second main surface side than the center of the element body in the facing direction of the first main surface and the second main surface is greater than the number of the other via conductors.

Description

Technical Field

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

[0002] A stacked coil component is known that includes a body, external electrodes provided on the body, and a coil disposed within the body (e.g., Japanese Patent Publication No. 2021-34667). In this stacked coil component, the coil has multiple coil conductors and through-hole conductors. By connecting the coil conductors to each other using through-hole conductors, the number of turns of the coil can be increased. Summary of the Invention

[0003] In the laminated coil component, it is desirable to suppress parasitic capacitance between the coil and the external electrode.

[0004] An object of the present disclosure is to provide a laminated coil component capable of suppressing parasitic capacitance between a coil and an external electrode.

[0005] (1) One embodiment of the present disclosure provides a stacked coil component comprising: a body having a first main surface and a second main surface opposite to each other, a first end surface and a second end surface opposite to each other, and a first side surface and a second side surface opposite to each other; a first external electrode and a second external electrode arranged on the first main surface; and a coil having a first end connected to the first external electrode and a second end connected to the second external electrode, the coil axis of the coil extending along the relative directions of the first side surface and the second side surface, the coil having a plurality of coil conductors and through-hole conductors connecting the plurality of coil conductors to each other, the number of the through-hole conductors arranged on the second main surface side relative to the center of the body in the relative directions of the first main surface and the second main surface is greater than the number of other through-hole conductors.

[0006] In this laminated coil component, more than half of the through-hole conductors are positioned closer to the second main surface than the center of the element body in the relative direction of the first and second main surfaces. This allows more than half of the through-hole conductors to be spaced away from the first and second external electrodes. Consequently, the parasitic capacitance generated between more than half of the through-hole conductors and the first and second external electrodes can be suppressed. Consequently, the parasitic capacitance between the coil and the first and second external electrodes can be suppressed.

[0007] (2) In the laminated coil component of (1), all of the through-hole conductors may be arranged closer to the second main surface than the center of the element body in the relative direction of the first main surface and the second main surface. In this case, the parasitic capacitance between the coil and the first external electrode and the second external electrode can be further suppressed.

[0008] (3) In the laminated coil component of (1) or (2), the coil may extend from the first end through between the coil axis and the first main surface and then to between the coil axis and the second end surface. In this case, the number of turns of the coil can be reduced, and the through-hole conductor can be arranged at a position closer to the second main surface than the center of the element body in the relative direction of the first and second main surfaces.

[0009] (4) In the laminated coil component of any one of (1) to (3), the first external electrode and the second external electrode may each include a first electrode portion provided on the first end surface and a second electrode portion provided on the first main surface. In this case, the parasitic capacitance between the through-hole conductor and the second electrode portion can be reliably suppressed. In addition, the parasitic capacitance between the through-hole conductor and the first electrode portion can also be easily suppressed. Therefore, the parasitic capacitance between the coil and the first external electrode and the second external electrode can be suppressed.

[0010] (5) In the laminated coil component according to any one of (1) to (4), the first external electrode and the second external electrode may be embedded in the element body so as to be exposed from the first main surface. In this case, the through-hole conductor can easily approach the first external electrode and the second external electrode. Therefore, a structure that allows the through-hole conductor to be separated from the first external electrode and the second external electrode is particularly effective in suppressing parasitic capacitance between the coil and the first external electrode and the second external electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view of the laminated coil component according to the first embodiment.

[0012] Figure 2 When viewed from the main surface 2a Figure 1 A top view of a stacked coil component.

[0013] Figure 3 Observed from the side 2c Figure 1 A top view of a stacked coil component.

[0014] Figure 4 yes Figure 1 Exploded view of the laminated coil assembly.

[0015] Figure 5 It is a top view of a laminated coil component of a comparative example.

[0016] Figure 6 It is a top view of a laminated coil component according to a modification.

[0017] Figure 7 It is a perspective view of a laminated coil component according to a second embodiment.

[0018] Figure 8 Observed from the side 2c Figure 7 A top view of a stacked coil component.

[0019] Figure 9 yes Figure 7 Exploded view of the laminated coil assembly. DETAILED DESCRIPTION

[0020] Hereinafter, the embodiments will be described with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and duplicate descriptions will be omitted as appropriate.

[0021] (First embodiment)

[0022] Reference Figures 1 to 4 The structure of the laminated coil component 1 according to the first embodiment will be described. Figure 1 It is a perspective view of the laminated coil component according to the first embodiment. Figure 2 When viewed from the main surface 2a Figure 1 A top view of a stacked coil component. Figure 3 Observed from the side 2c Figure 1 A top view of the laminated coil component. Figure 3 In FIG, the element body 2 is indicated by a dotted line. The laminated coil component 1 of this embodiment is soldered and mounted on an electronic device. The electronic device includes, for example, a circuit board or an electronic component. The laminated coil component 1 is, for example, a high-frequency inductor.

[0023] like Figures 1 to 3 As shown, the laminated coil component 1 includes an element body 2, a coil 3 disposed within the element body 2, a pair of external electrodes 41, 42 disposed on the surface of the element body 2, and a pair of connecting conductors 51, 52 disposed within the element body 2. The external electrodes 41, 42 are electrically connected to the coil 3. The element body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and edges, and a rectangular parallelepiped shape with rounded corners and edges.

[0024] The element body 2 has a pair of main surfaces 2a and 2b facing each other, a pair of side surfaces 2c and 2d facing each other, and a pair of end surfaces 2e and 2f facing each other. The main surfaces 2a and 2b, the side surfaces 2c and 2d, and the end surfaces 2e and 2f are rectangular. The main surfaces 2a and 2b are adjacent to the side surfaces 2c and 2d and the end surfaces 2e and 2f. The side surfaces 2c and 2d and the end surfaces 2e and 2f are adjacent to each other. When the stacked coil component 1 is soldered and mounted on an electronic device, the main surface 2a is opposite to the electronic device to be soldered and mounted. The main surfaces 2a and 2b, the side surfaces 2c and 2d, and the end surfaces 2e and 2f are planes. A plane refers to a surface formed with a plane as the goal, and is not limited to a geometrically complete plane. A plane may include curvature and bumps generated during the manufacturing process.

[0025] The direction D3 in which the pair of main surfaces 2a and 2b oppose each other is perpendicular to the main surfaces 2a and 2b, respectively. The direction D1 in which the pair of side surfaces 2c and 2d oppose each other is perpendicular to the side surfaces 2c and 2d, respectively. The direction D2 in which the pair of end surfaces 2e and 2f oppose each other is perpendicular to the end surfaces 2e and 2f, respectively. Direction D3 is perpendicular to both directions D1 and D2. Directions D1 and D2 are mutually perpendicular. A pair of recesses corresponding to the pair of external electrodes 41 and 42 are formed in the element body 2.

[0026] like Figure 4 As shown, the element body 2 includes a plurality of insulating layers 20 stacked in a direction D1. The plurality of insulating layers 20 are integrated to such an extent that the boundaries between the insulating layers 20 cannot be identified. Each insulating layer 20 is made of, for example, a non-magnetic material. Non-magnetic materials include, for example, glass ceramic materials or dielectric materials. Glass components include, for example, borosilicate glass. Dielectric materials include, for example, dielectric ceramics such as BaTiO3, Ba(Ti, Zr)O3, or (Ba, Ca)TiO3. In this embodiment, each insulating layer 20 is made of a sintered body of a green sheet containing a non-magnetic material. Each insulating layer 20 may also be made of a magnetic material.

[0027] The plurality of insulating layers 20 include Figure 2 The pair of outer layers 21, 22 shown (in Figure 4 The outer layers 21 and 22 are located at both ends in the direction D1 and constitute the outermost layer of the element body 2. The outer layer 21 has a side surface 2c. The outer layer 22 has a side surface 2d. The remaining plurality of insulating layers 20 are arranged between the outer layers 21 and 22 in the direction D1, constituting Figure 2 The outer layers 21 and 22 have higher rigidity than the laminate 23, thus preventing damage to the element body 2. Rigidity can be adjusted, for example, by adjusting the filler content. The coil 3, external electrodes 41 and 42, and connecting conductors 51 and 52 are located within the laminate 23 and are not located on the outer layers 21 and 22.

[0028] The thicknesses of the multiple insulating layers 20 are equal. In this specification, "equal" does not necessarily mean simply that the values ​​are identical. Even if the values ​​include slight variations within a predetermined range, manufacturing errors, or measurement errors, they can still be considered equal. The thicknesses of the outer layers 21 and 22 may also differ from the thickness of the insulating layers 20 that constitute the laminate 23.

[0029] The external electrodes 41 and 42 are arranged at least on the main surface 2a. The external electrodes 41 and 42 are separated from each other in the direction D2. In the present embodiment, the external electrode 41 is arranged on the main surface 2a and the end surface 2e. The external electrode 42 is arranged on the main surface 2a and the end surface 2f. The external electrodes 41 and 42 are embedded in the element body 2 in a manner that is exposed from at least the main surface 2a. In the present embodiment, the external electrode 41 is embedded in the element body 2 in a manner that is exposed from the end surface 2e and the main surface 2a. The external electrode 42 is embedded in the element body 2 in a manner that is exposed from the end surface 2f and the main surface 2a. When viewed from the direction D1, the external electrodes 41 and 42 have an L-shaped cross-section. The recesses corresponding to the external electrodes 41 and 42 formed on the element body 2 have an L-shape when viewed from the direction D1.

[0030] External electrode 41 includes electrode portion 41a and electrode portion 41b. Electrode portion 41a is exposed from end surface 2e. Electrode portion 41b is exposed from main surface 2a. The surface of electrode portion 41a faces the same direction as end surface 2e. The surface of electrode portion 41b faces the same direction as main surface 2a. Electrode portion 41a and electrode portion 41b are continuous along the ridgeline between end surface 2e and main surface 2a.

[0031] External electrode 42 includes electrode portion 42a and electrode portion 42b. Electrode portion 42a is exposed from end surface 2f. Electrode portion 42b is exposed from main surface 2a. The surface of electrode portion 42a faces the same direction as end surface 2f. The surface of electrode portion 42b faces the same direction as main surface 2a. Electrode portion 42a and electrode portion 42b are continuous along the ridgeline between end surface 2f and main surface 2a.

[0032] In this embodiment, the length of the external electrodes 41 and 42 in direction D3 is longer than the length of the external electrodes 41 and 42 in direction D2. The electrode portions 41b and 42b are arranged so as to be exposed in the same direction as the principal surface 2a. The surfaces of the electrode portions 41b and 42b and the principal surface 2a may be coplanar. The surfaces of the electrode portions 41b and 42b may protrude from the principal surface 2a. The electrode portion 41a is arranged so as to be exposed in the same direction as the end surface 2e. The surface of the electrode portion 41a and the end surface 2e may be coplanar. The surface of the electrode portion 41a may protrude from the end surface 2e. The electrode portion 42a is arranged so as to be exposed in the same direction as the end surface 2f on the end surface 2f. The surface of the electrode portion 42a and the end surface 2f may be coplanar. The surface of the electrode portion 42a may protrude from the end surface 2f. In this embodiment, the length of the electrode portions 41a and 42a in direction D3 is longer than the length of the electrode portions 41b and 42b in direction D2.

[0033] like Figure 3 As shown, the coil 3 and the external electrodes 41, 42 (see Figure 1 ) is connected. Coil 3 has a first end 3x and a second end 3y. First end 3x is connected to external electrode 41 via a connecting conductor 51. Second end 3y is connected to external electrode 42 via a connecting conductor 52. The coil axis AX of coil 3 extends along direction D1. Coil 3 is arranged inside element body 2 and does not appear from element body 2.

[0034] When viewed from side 2c, coil 3 is wound counterclockwise around coil axis AX. Coil 3 repeatedly passes from first end 3x between coil axis AX and principal surface 2a, between coil axis AX and end surface 2f, between coil axis AX and principal surface 2b, and between coil axis AX and end surface 2e, reaching second end 3y. Coil 3 repeatedly passes from second end 3y between coil axis AX and principal surface 2a, between coil axis AX and end surface 2e, between coil axis AX and principal surface 2b, and between coil axis AX and end surface 2f, reaching first end 3x.

[0035] The coil 3 is annular when viewed from the direction D1. The coil 3 is pentagonal when viewed from the direction D1. The pentagon is line-symmetrical in the direction D2 relative to the center line along the direction D3. The pentagon includes a first side located closest to the main surface 2b, a second side located closest to the end surface 2f, a third side and a fourth side located closest to the main surface 2a, and a fifth side located closest to the end surface 2e. The first side and the second side are connected at the first vertex, the second side and the third side are connected at the second vertex, the third side and the fourth side are connected at the third vertex, the fourth side and the fifth side are connected at the fourth vertex, and the fifth side and the first side are connected at the fifth vertex. The second side and the fifth side are line-symmetrical with each other relative to the center line passing through the third vertex between the third side and the fourth side, and the third side and the fourth side are line-symmetrical with each other relative to the center line passing through the third vertex between the third side and the fourth side. The first side is longer than the second side and the fifth side, respectively. Each of the second side and the fifth side is longer than each of the third side and the fourth side.

[0036] The first side extends parallel to direction D2. The second side is inclined relative to direction D3 so as to move away from end surface 2f as it approaches the third side from the first side. The third side is inclined relative to direction D2 so as to move closer to principal surface 2a as it approaches the fourth side from the second side. The fourth side is inclined relative to direction D2 so as to move away from principal surface 2a as it approaches the fifth side from the third side. The fifth side is inclined relative to direction D3 so as to move closer to end surface 2e as it approaches the first side from the fourth side.

[0037] The coil 3 includes coil portions 3a, 3b, 3e, and 3f. The coil portion 3a and the coil portion 3b are opposite to each other in the direction D3. The coil portion 3a is arranged near the main surface 2a and includes the third and fourth sides mentioned above. The coil portion 3a extends between the coil axis AX and the main surface 2a. The coil portion 3b is arranged near the main surface 2b and includes the first side mentioned above. The coil portion 3b extends between the coil axis AX and the main surface 2b. The coil portion 3e and the coil portion 3f are opposite to each other in the direction D2. The coil portion 3e is arranged near the end surface 2e and includes the fifth side mentioned above. The coil portion 3e extends between the coil axis AX and the end surface 2e. The coil portion 3f is arranged near the end surface 2f and includes the second side mentioned above. The coil portion 3f extends between the coil axis AX and the end surface 2f.

[0038] Each coil portion 3a, 3b is adjacent to coil portion 3e and coil portion 3f. Each coil portion 3a, 3b connects coil portion 3e and coil portion 3f. Each coil portion 3e, 3f is adjacent to coil portion 3a and coil portion 3b. Each coil portion 3e, 3f connects coil portion 3a and coil portion 3b.

[0039] like Figure 4 As shown, the coil 3 includes a plurality of coil conductors 31 to 37 and a plurality of through-hole conductors T1 to T6. The plurality of coil conductors 31 to 37 are electrically connected to each other by the plurality of through-hole conductors T1 to T6. The coil 3 includes, for example, five or more coil conductors and four or more through-hole conductors.

[0040] like Figure 3 and Figure 4 As shown, the connecting conductor 51 electrically connects the first end 3x of the coil 3 and the external electrode 41 to each other. The first end 3x of the coil 3 and the external electrode 41 are physically connected to each other via the connecting conductor 51. The connecting conductor 51 extends from the electrode portion 41a toward the main surface 2a side and is connected to the first end 3x. The connecting conductor 52 electrically connects the second end 3y of the coil 3 and the external electrode 42 to each other. The second end 3y of the coil 3 and the external electrode 42 are physically connected to each other via the connecting conductor 52. The connecting conductor 52 extends from the electrode portion 42a toward the main surface 2a side and is connected to the second end 3y.

[0041] In the present embodiment, the stacking direction of the laminated coil component 1 is along the direction D1. Figure 4 The diagram shows the multiple layers constituting the laminated coil component 1 as viewed from the direction D1. The multiple layers constituting the laminated coil component 1 include an insulating layer 20, coil conductors 31 to 37, via-hole conductors T1 to T6, layers constituting external electrodes 41 and 42, and connecting conductors 51 and 52. Figure 4 9 shows seven layers including coil conductors 31 to 37 among the plurality of layers constituting the laminated coil component 1 , and the remaining layers are omitted.

[0042] The external electrodes 41 and 42 are respectively composed of a plurality of stacked electrode layers 410 and 420. In the actual external electrode 41, the electrode layers 410 are integrated to the extent that the boundaries between the electrode layers 410 cannot be distinguished. In the actual external electrode 42, the electrode layers 420 are integrated to the extent that the boundaries between the electrode layers 420 cannot be distinguished. Each electrode layer 410 and 420 is provided in a defective portion formed in the corresponding insulating layer 20. A pair of depressions corresponding to the external electrodes 41 and 42 are obtained by utilizing the defective portion formed in each insulating layer 20. Each electrode layer 410 and 420 is composed of, for example, a conductive material. The conductive material contains, 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 powder of a conductive material.

[0043] Connecting conductors 51 and 52 are provided in the defective portions formed in the corresponding insulating layer 20. Connecting conductors 51 and 52 are, for example, made of the same material as the electrode layers 410 and 420. Each connecting conductor 51 and 52 is, for example, made of a sintered body of a conductive paste. Coil conductors 31 to 37 are provided in the defective portions formed in the corresponding insulating layer 20. Coil conductors 31 to 37 are, for example, made of the same material as the electrode layers 410 and 420. Each coil conductor 31 to 37 is, for example, made of a sintered body of a conductive paste.

[0044] Coil conductors 31-37 form a portion of the loop path within coil 3. For example, coil conductors 31-37 may have a partially interrupted loop. Each coil conductor 31-37 has a path length and a thickness. The path length of each coil conductor 31-37 is, for example, at least 80% of the length of one turn of coil 3. In other words, the gap between the ends of each coil conductor 31-37 is, for example, less than 20% of the length of one turn of coil 3.

[0045] The widths of the coil conductors 31 to 37 are equal to each other. The width of the coil conductors 31 to 37 is the length of the coil conductors 31 to 37 in a direction perpendicular to the direction D1 and perpendicular to the paths of the coil conductors 31 to 37. The thicknesses of the coil conductors 31 to 37 are equal to each other. The thickness of the coil conductors 31 to 37 is the length of the coil conductors 31 to 37 in the direction D1. The layers of the coil conductors 31 to 37 correspond to the layers constituting the laminated coil component 1. The layers of the coil conductors 31 to 37 extend along a plane intersecting the direction D1 in which the coil conductors 31 to 37 are arranged. In the present embodiment, the layers of the coil conductors 31 to 37 extend along the directions D2 and D3.

[0046] Coil conductors 31 to 37 are arranged in this order in direction D1. Coil conductor 31 includes first end 3x of coil 3. Coil conductor 31 is connected to electrode portion 41a of external electrode 41 via connecting conductor 51. Connecting conductor 51 is connected to electrode portion 41a at a position closer to principal surface 2a than principal surface 2b in direction D3. Coil conductor 31 is included in the same layer as connecting conductor 51. Coil conductor 31 is adjacent to outer layer 21 in direction D1.

[0047] Coil conductor 37 includes second end 3y of coil 3. Coil conductor 37 is connected to electrode portion 42a of external electrode 42 via connecting conductor 52. Connecting conductor 52 is connected to electrode portion 42a at a position closer to principal surface 2a than principal surface 2b in direction D3. Coil conductor 37 is included in the same layer as connecting conductor 52. Coil conductor 37 is adjacent to outer layer 22 in direction D1.

[0048] Coil conductors 31 and 32 are each provided over a portion of coil portion 3e and the total length of coil portions 3a, 3f, and 3b. Coil conductors 33 to 35 are each provided over a portion of coil portion 3b and the total length of coil portions 3e, 3a, and 3f. Coil conductors 36 and 37 are each provided over a portion of coil portion 3f and the total length of coil portions 3e, 3a, and 3b.

[0049] Through-hole conductors T1 to T6 are respectively provided in the plurality of layers constituting the laminated coil component 1, and are arranged in six layers between the seven layers including the coil conductors 31 to 37. Through-hole conductor T1 extends in direction D1 and connects the ends of the coil conductors 31 and 32. Through-hole conductor T2 extends in direction D1 and connects the ends of the coil conductors 32 and 33. Through-hole conductor T3 extends in direction D1 and connects the ends of the coil conductors 33 and 34. Through-hole conductor T4 extends in direction D1 and connects the ends of the coil conductors 34 and 35. Through-hole conductor T5 extends in direction D1 and connects the ends of the coil conductors 35 and 36. Through-hole conductor T6 extends in direction D1 and connects the ends of the coil conductors 36 and 37.

[0050] When viewed from the direction D1, the via-hole conductors T1 to T6 are separated from each other and arranged in this order along the path of the coil 3. The via-hole conductor T1 is arranged in the coil portion 3e. The via-hole conductors T2 to T5 are arranged in the coil portion 3b. The via-hole conductor T6 is arranged in the coil portion 3f.

[0051] The number of through-hole conductors T1 to T6 arranged closer to the main surface 2b than the center of the element body 2 in direction D3 is greater than the number of other through-hole conductors. In this embodiment, all through-hole conductors T1 to T6 are arranged closer to the main surface 2b than the center of the element body 2 in direction D3. That is, the distance in direction D3 between each through-hole conductor T1 to T6 and the main surface 2a is longer than 1 / 2 of the length of the element body 2 in direction D3. The number of through-hole conductors T1 to T6 arranged closer to the main surface 2b than the external electrodes 41 and 42 may also be greater than the number of other through-hole conductors. In this embodiment, all through-hole conductors T1 to T6 are arranged closer to the main surface 2b than the external electrodes 41 and 42. That is, the distance in direction D3 between each through-hole conductor T1 to T6 and the main surface 2b is shorter than the distance in direction D3 between the external electrodes 41 and 42 and the main surface 2b.

[0052] Figure 5 It is a top view of a laminated coil component of a comparative example. Figure 5 The laminated coil component 100 of the comparative example shown is different from the laminated coil component 100 in terms of the shapes of the coil 3 and the connecting conductors 51 and 52. Figure 3 The laminated coil component 1 shown is different. In the laminated coil component 100, the through-hole conductors T1 to T6 are all arranged at a position closer to the main surface 2a than the center of the element body 2 in the direction D3. In contrast, in the laminated coil component 1, the through-hole conductors T1 to T6 are all arranged at a position closer to the main surface 2b than the center of the element body 2 in the direction D3. Therefore, the through-hole conductors T1 to T6 can be kept away from the external electrodes 41 and 42. Therefore, the parasitic capacitance generated between the through-hole conductors T1 to T6 and the external electrodes 41 and 42 can be suppressed. As a result, the parasitic capacitance between the coil 3 and the external electrodes 41 and 42 can be suppressed.

[0053] In the laminated coil component 100, the connecting conductor 51 extends from the external electrode 41 toward the main surface 2b side and is connected to the first end 3x of the coil 3. The connecting conductor 52 extends from the external electrode 42 toward the main surface 2b side and is connected to the second end 3y of the coil 3. When viewed from the side 2c, the coil 3 is wound clockwise around the coil axis AX. The coil 3 extends in a manner that passes between the coil axis AX and the main surface 2b and reaches between the coil axis AX and the end surface 2f. The coil 3 extends in a manner that passes between the coil axis AX and the main surface 2b and reaches between the coil axis AX and the end surface 2e from the second end 3y.

[0054] In contrast, in the stacked coil component 1, the connecting conductor 51 is led out from the external electrode 41 to the main surface 2a side and is connected to the first end 3x of the coil 3. The connecting conductor 52 is led out from the external electrode 42 to the main surface 2a side and is connected to the second end 3y of the coil 3. When viewed from the side 2c, the coil 3 is wound counterclockwise around the coil axis AX. The coil 3 extends in a manner that passes between the coil axis AX and the main surface 2a and reaches between the coil axis AX and the end surface 2f. The coil 3 extends in a manner that passes between the coil axis AX and the main surface 2a and reaches between the coil axis AX and the end surface 2e from the second end 3y.

[0055] In the laminated coil component 1, the coil 3 is wound in this manner, and therefore, it is different from the laminated coil component 1A of the modified example described later (see Figure 6 ), the through-hole conductors T1 to T6 can be arranged closer to the main surface 2b side than the center of the element body 2 in the direction D3 without reducing the number of turns of the coil 3.

[0056] In the laminated coil component 1, when viewed from the direction D1, the external electrodes 41 and 42 have an L-shaped cross-section. The electrode portions 41a and 42a are provided on the portions of the end faces 2e and 2f that are closer to the main surface 2a. Therefore, by arranging the through-hole conductors T1 to T6 closer to the main surface 2b than the center of the element body 2 in the direction D3, the parasitic capacitance between the through-hole conductors T1 to T6 and the electrode portions 41a and 42a can be suppressed. The electrode portions 41b and 42b are provided on the main surface 2a. Therefore, by arranging the through-hole conductors T1 to T6 closer to the main surface 2b than the center of the element body 2 in the direction D3, the parasitic capacitance between the through-hole conductors T1 to T6 and the electrode portions 41b and 42b can be suppressed. Therefore, the parasitic capacitance between the coil 3 and the external electrodes 41 and 42 can be suppressed.

[0057] In the laminated coil component 1, the external electrodes 41 and 42 are embedded in the element body 2. Therefore, the through-hole conductors T1 to T6 are easily accessible to the external electrodes 41 and 42. Therefore, the structure in which the through-hole conductors T1 to T6 can be separated from the external electrodes 41 and 42 is particularly effective in reducing the stray capacitance between the coil 3 and the external electrodes 41 and 42.

[0058] Figure 6 It is a top view of a laminated coil component according to a modification. Figure 6 The laminated coil component 1A of the modified example shown is different from the laminated coil component 1A in terms of the shapes of the coil 3 and the connecting conductors 51 and 52. Figure 3 The laminated coil component 1 shown is different. The connecting conductors 51 and 52 of the laminated coil component 1A have the same Figure 5The connecting conductors 51 and 52 of the laminated coil component 100 shown in FIG. The coil 3 of the laminated coil component 1A is also the same as the coil of the laminated coil component 100 and is wound clockwise around the coil axis AX when viewed from the side 2c. A through-hole conductor T1 is located in the coil portion 3f. Through-hole conductors T2 to T5 are located in the coil portion 3b. A through-hole conductor T6 is located in the coil portion 3e.

[0059] In the laminated coil component 1A, the path length of each coil conductor 32-36 is also, for example, at least 80% of the length of one turn of the coil 3. In contrast, the path length of the coil conductor 31 is set shorter, for example, at less than 50% of the length of one turn of the coil 3. As a result, the through-hole conductors T1-T6 are all positioned closer to the main surface 2b than the center of the element body 2 in direction D3. Therefore, in the laminated coil component 1A, similar to the laminated coil component 1, the parasitic capacitance generated between the through-hole conductors T1-T6 and the external electrodes 41 and 42 can be suppressed.

[0060] (Second embodiment)

[0061] Reference Figures 7 to 9 The structure of a laminated coil component 1B according to the second embodiment will be described. Figure 7 It is a perspective view of a laminated coil component according to a second embodiment. Figure 8 Observed from the side 2c Figure 7 A top view of the laminated coil component. Figure 8 In FIG, the element body 2 is represented by a dotted line. Figure 9 yes Figure 7 Exploded view of a laminated coil component. Laminated coil component 1B of this embodiment differs from laminated coil component 1 in that it includes coil 3B, external electrodes 41B, 42B, and connecting conductors 51B, 52B instead of coil 3, external electrodes 41, 42, and connecting conductors 51, 52. The following description of laminated coil component 1 focuses on the differences from laminated coil component 1.

[0062] External electrodes 41B and 42B have the same shape as electrode portions 41b and 42b of external electrodes 41 and 42. Specifically, external electrodes 41B and 42B have the same shape as electrode portions 41a and 42a of external electrodes 41 and 42, respectively. External electrodes 41B and 42B have a rectangular plate shape with direction D3 as the thickness direction. When viewed from direction D1, external electrodes 41B and 42B have a rectangular cross-section with direction D2 as the longitudinal direction.

[0063] The external electrodes 41B and 42B are arranged on the main surface 2a. The external electrodes 41B and 42B are so-called bottom electrodes. The external electrodes 41B and 42B are embedded in the element body 2 so as to be exposed from at least the main surface 2a. In this embodiment, the external electrode 41B is embedded in the element body 2 so as to be exposed from the end surface 2e and the main surface 2a. The external electrode 42B is embedded in the element body 2 so as to be exposed from the end surface 2f and the main surface 2a. The surface of the external electrode 41B can be located on the same plane as the end surface 2e and the main surface 2a, or it can protrude from the end surface 2e and the main surface 2a. The surface of the external electrode 42B can be located on the same plane as the end surface 2f and the main surface 2a, or it can protrude from the end surface 2f and the main surface 2a.

[0064] Coil 3B differs from Coil 3 in that it is rectangular when viewed from direction D1. The rectangle includes a first side located closest to the main surface 2b, a second side located closest to the end surface 2f, a third side located closest to the main surface 2a, and a fourth side located closest to the end surface 2e. The first and third sides are the long sides of the rectangle and extend parallel to direction D2. The second and fourth sides are the short sides of the rectangle and extend parallel to direction D3. The first and second sides are connected at the first vertex, the second and third sides are connected at the second vertex, the third and fourth sides are connected at the third vertex, and the fourth side is connected to the first side at the fourth vertex.

[0065] In coil 3B, coil portion 3a includes the aforementioned third side and extends between coil axis AX and main surface 2a. Coil portion 3b includes the aforementioned first side and extends between coil axis AX and main surface 2b. Coil portion 3e includes the aforementioned fourth side and extends between coil axis AX and end surface 2e. Coil portion 3f includes the aforementioned second side and extends between coil axis AX and end surface 2f.

[0066] Similar to coil 3, coil 3B is wound counterclockwise around coil axis AX when viewed from side 2c. Coil 3B extends from first end 3x, passing between coil axis AX and main surface 2a, and then between coil axis AX and end surface 2f. Coil 3B extends from second end 3y, passing between coil axis AX and main surface 2a, and then between coil axis AX and end surface 2e.

[0067] In coil 3B, coil conductors 31 and 32 are each provided over a portion of coil portion 3e and the total length of coil portions 3a, 3b, and 3f. Coil conductors 33 to 35 are each provided over a portion of coil portion 3b and the total length of coil portions 3a, 3e, and 3f. Coil conductors 36 and 37 are each provided over a portion of coil portion 3f and the total length of coil portions 3a, 3b, and 3e.

[0068] Connecting conductors 51B and 52B differ from connecting conductors 51 and 52 in that they extend linearly along direction D3. Connecting conductor 51B extends linearly from external electrode 41B along direction D3 and is connected to first end 3x. First end 3x is located at the aforementioned third vertex. Connecting conductor 52B extends linearly from external electrode 42B along direction D3 and is connected to second end 3y. Second end 3y is located at the aforementioned second vertex.

[0069] In coil 3B, all through-hole conductors T1-T6 are also located closer to principal surface 2b than the center of element body 2 in direction D3. That is, the shortest distance between each through-hole conductor T1-T6 and principal surface 2a in direction D3 is longer than half the length of element body 2 in direction D3. Through-hole conductor T1 is located in coil portion 3e. Through-hole conductors T2-T5 are located in coil portion 3b. Through-hole conductor T6 is located in coil portion 3f.

[0070] As described above, in the laminated coil component 1B, the through-hole conductors T1 to T6 are all arranged on the main surface 2b side relative to the center of the element body 2 in the direction D3. Therefore, the parasitic capacitance generated between the through-hole conductors T1 to T6 and the external electrodes 41B and 42B can be suppressed. In addition, the coil 3B extends from the first end 3x through the coil axis AX and the main surface 2a and reaches between the coil axis AX and the end surface 2f. In the laminated coil component 1B, the coil 3B is also wound in this way. Therefore, without reducing the number of turns of the coil 3B, the through-hole conductors T1 to T6 can be arranged on the main surface 2b side relative to the center of the element body 2 in the direction D3.

[0071] Although the embodiments have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. The above-described embodiments and modifications can also be combined as appropriate.

[0072] In the laminated coil components 1, 1A, and 1B, the outer layers 21 and 22 have high rigidity, but may also have the same rigidity as the other insulating layers 20. In the laminated coil components 1 and 1A, the connecting conductor 51 may be connected to the coil portion 3a via the coil portion 3e, and the connecting conductor 52 may be connected to the coil portion 3a via the coil portion 3f. The connecting conductor 51 may be connected to the electrode portion 41a at a position closer to the main surface 2b than the main surface 2a in the direction D3. The connecting conductor 52 may be connected to the electrode portion 42a at a position closer to the main surface 2b than the main surface 2a in the direction D3.

[0073] In the laminated coil components 1 , 1A, and 1B, less than half of the via-hole conductors T1 to T6 may be arranged closer to the principal surface 2 a than the center of the element body 2 in the direction D3 .

Claims

1. A laminated coil component comprising: The element body has a first main surface and a second main surface facing each other, a first end surface and a second end surface facing each other, and a first side surface and a second side surface facing each other; A first external electrode and a second external electrode are disposed on the first main surface; and a coil having a first end connected to the first external electrode and a second end connected to the second external electrode, The coil axis of the coil extends along the opposite directions of the first side surface and the second side surface. The coil includes a plurality of coil conductors and a through-hole conductor connecting the plurality of coil conductors to each other. The number of the through-hole conductors arranged on the second main surface side relative to the center of the element body in the opposing direction of the first main surface and the second main surface is greater than the number of the other through-hole conductors.

2. The laminated coil component according to claim 1, wherein All of the through-hole conductors are arranged closer to the second main surface than the center of the element body in the opposing direction of the first main surface and the second main surface.

3. The laminated coil component according to claim 1 or 2, wherein: The coil extends from the first end through between the coil axis and the first main surface and reaches between the coil axis and the second end surface.

4. The laminated coil component according to claim 1 or 2, wherein: The first external electrode and the second external electrode each include a first electrode portion provided on the first end surface and a second electrode portion provided on the first main surface.

5. The laminated coil component according to claim 1 or 2, wherein The first external electrode and the second external electrode are each embedded in the element body so as to be exposed from the first main surface.

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