Multilayer coil component

Abstract

To provide a lamination coil component with improved connectivity between a coil and an external electrode.SOLUTION: In a lamination coil component 10, lead conductors 30 are exposed from the end faces 12a and 12b of an element body 12 and connected to external electrodes 14A and 14B provided on the end faces 12a and 12b. When the lead conductors 30 are led out to the end faces 12a and 12b of the element body 12, the lead area can be easily expanded compared to a case in which the lead conductors 30 are led out to the side faces 12c to 12f of the element body 12. Therefore, a coil 20 and the external electrodes 14A and 14B are connected via the lead conductor 30, such that high connectivity between the coil 20 and the external electrodes 14A and 14B is realized.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Conventionally, a multilayer coil component has been known in which a coil having a coil axis parallel to the lamination direction is provided in a body having a laminated structure. Patent Document 1 below discloses a technique for forming a conductor pattern constituting a coil using a printing method.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the multilayer coil component according to the above-described conventional technology, as shown in FIGS. 12 and 13, the coil patterns 21 and 22 constituting the coil 20 and the lead conductors 30A for drawing out each end of the coil 20 to the side surface of the body 12 (that is, the surface extending parallel to the lamination direction of the body 12) are formed by a printing method. Therefore, the lead-out area of the coil 20 is substantially the same as the cross-sectional area of the conductor pattern constituting the lead conductor 30A.

[0005] The inventors have conducted repeated studies on the lead-out area of the coil and newly found a technique for increasing the lead-out area of the coil to improve the connectivity between the coil and the external electrodes.

[0006] One aspect of the present invention aims to provide a multilayer coil component in which the connectivity between the coil and the external electrodes is improved.

Means for Solving the Problems

[0007] A laminated coil component according to one aspect of the present invention comprises a sintered body including a plurality of stacked layers and having a pair of end faces facing each other in a first direction parallel to a stacking direction of the plurality of layers, a coil provided within the sintered body and having a coil axis parallel to the first direction, a pair of external electrodes provided on each end face of the sintered body, and a pair of lead conductors provided between each end of the coil and the end face of the sintered body, the lead conductors being electrically connected to the ends of the coil and exposed from the end face of the sintered body to be connected to the external electrodes, the lead conductors each having a first end and a second end located closer to the end face than the first end and misaligned from the first end when viewed from the first direction, and including a plurality of lead layers overlapping in the first direction, and adjacent lead layers in the first direction have the first end of one lead layer overlapping with the second end of the other lead layer.

[0008] In the laminated coil component, the lead conductors connected to the ends of the coils are exposed from the end faces of the sintered body and connected to the external electrodes provided on the end faces. When the lead conductors are led to the end faces of the sintered body, the lead area can be easily enlarged compared to when the lead conductors are led to the side faces of the body, and high connectivity between the coils and the external electrodes can be achieved.

[0009] In a laminated coil component according to another aspect, the plurality of lead layers each have an I-shape when viewed from the first direction, and are overlapped in a zigzag pattern.

[0010] In a laminated coil component according to another aspect, the length of the lead conductor in the first direction is 5% or more of the length of the sintered body in the first direction and is equal to or less than the inner diameter of the coil.

[0011] In a laminated coil component according to another aspect, the lead conductor includes a first lead layer exposed at an end surface of the sintered body and a second lead layer overlapping the first lead layer on the coil side, and the area of the first lead layer when viewed from a first direction is larger than the area of the second lead layer.

[0012] In a laminated coil component according to another aspect, the sintered body has a printed laminated structure.

Advantages of the Invention

[0013] According to various aspects of the present invention, a multilayer coil component is provided in which the connectivity between the coil and the external electrodes is improved.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Modes for Carrying Out the Invention

[0015] Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0016] With reference to FIGS. 1 to 3, the configuration of the multilayer coil component according to the embodiment will be described. As shown in FIG. 1, the multilayer coil component 10 according to the embodiment includes a base body 12 and a pair of external electrodes 14A and 14B.

[0017] The base body 12 has a substantially rectangular parallelepiped outer shape and has a pair of end faces 12a and 12b facing each other in the extending direction of the base body 12. The base body 12 further has four side faces 12c to 12f extending in the facing direction of the end faces 12a and 12b and connecting the end faces 12a and 12b. In the present embodiment, the side face 12d is a mounting surface that faces the mounting substrate when the multilayer coil component 10 is mounted, and the side face 12c facing the side face 12d becomes the top surface when mounted. The dimensions of the base body 12 are, for example, 1.6 mm in length × 0.8 mm in width × 0.8 mm in thickness, where the dimension in the facing direction of the end faces 12a and 12b is the length, the dimension in the facing direction of the side faces 12e and 12f is the width, and the dimension in the facing direction of the side faces 12c and 12d is the thickness.

[0018] The pair of external electrodes 14A and 14B are respectively provided on the end faces 12a and 12b of the base body 12. In the present embodiment, the external electrode 14A integrally covers the entire area of the end face 12a and the side faces 12c to 12f in the area adjacent to the end face 12a. Similarly, the external electrode 14B integrally covers the entire area of the end face 12b and the side faces 12c to 12f in the area adjacent to the end face 12b. Each of the external electrodes 14A and 14B is composed of one or a plurality of electrode layers. As the electrode material constituting each of the external electrodes 14A and 14B, a metal material such as Ag can be adopted, for example.

[0019] The element body 12 has a configuration in which an internal conductor 18 is provided inside a magnetic body 16. The element body 12 has a laminated structure. The magnetic body 16 has a laminated structure in which a plurality of magnetic body layers 16L and 16R, which will be described later, are laminated in the direction in which end faces 12a and 12b face each other. In the following description, the direction in which the end faces 12a and 12b face each other is also referred to as the lamination direction or the first direction of the element body 12.

[0020] The magnetic body 16 is made of a magnetic material such as ferrite, for example. The magnetic body 16 is obtained by laminating and firing a plurality of magnetic body pastes (for example, ferrite paste) that become the magnetic body layers 16L and 16R. That is, the element body 12 has a printed laminated structure in which the magnetic body layers 16L and 16R on which the magnetic body paste is printed are laminated, and is a fired element body in which the fired magnetic body layers 16L and 16R are laminated. The number of layers of the magnetic body layers 16L and 16R constituting the element body 12 is, for example, 30 layers. The thickness of each of the magnetic body layers 16L and 16R is, for example, 30 μm. In the actual element body 12, the plurality of magnetic body layers 16L and 16R are integrated to such an extent that the boundaries between the layers are not visible.

[0021] The internal conductor 18 is configured to include one coil 20 and a pair of lead conductors 30. Both the coil 20 and the lead conductors 30 of the internal conductor 18 have a laminated structure with respect to the lamination direction of the element body 12. As shown in FIG. 2, in the present embodiment, the coil 20 has a cylindrical outer shape.

[0022] As shown in FIG. 3, the coil 20 has a coil axis Z parallel to the lamination direction of the element body 12 and is wound around the coil axis Z. In the present embodiment, the length of the coil 20 in the lamination direction of the element body 12 is 1.3 mm. With respect to the lamination direction of the element body 12, the length of the coil 20 can be designed to be in the range of 50 to 90% of the length of the element body 12. Also, in the present embodiment, the inner diameter of the coil 20 is 0.20 to 0.40 mm, and is, for example, 0.35 mm.

[0023] The coil 20 includes a plurality of coil layers 21, 22. The coil layers 21, 22 constituting the coil 20 are made of a conductive material containing a metal such as Ag. The coil 20 is formed by a printing method. Specifically, the coil 20 is obtained by applying a conductive paste (for example, an Ag paste) to be the coil layers 21, 22 on a magnetic paste to be the magnetic layers 16L, 16R and baking them. The thickness of each of the coil layers 21, 22 is, for example, 20 μm.

[0024] FIG. 4 is an exploded perspective view showing the laminated structure of the coil 20 portion of the base body 12. As shown in FIG. 4, in the portion of the coil 20 of the internal conductor 18, the coil layers 21, 22 constituting the coil 20 and the magnetic layers 16L, 16R constituting the base body 12 are alternately laminated.

[0025] Both of the coil layers 21, 22 exhibit a C-shaped (or U-shaped) form when viewed from the lamination direction of the base body 12. When viewed from the lamination direction of the base body 12, the coil layer 21 and the coil layer 22 have a point-symmetrical or rotationally symmetrical relationship with respect to the coil axis Z. Both of the coil layer 21 and the coil layer 22 constitute 3 / 4 turns of the coil 20. In the lamination direction of the base body 12, the coil layer 21 and the coil layer 22 are arranged alternately. The coil layer 21 and the coil layer 22 adjacent to each other in the lamination direction of the base body 12 are joined with their ends overlapping each other, constituting one turn of the coil 20 surrounding the coil axis Z.

[0026] FIGS. 5 and 6 are diagrams showing the procedure for forming the coil 20 by the printing method.

[0027] As shown in FIG. 5(a), first, a conductive paste to be the coil layer 22 is printed on a base magnetic layer. The coil layer 22 has a first end 22a on the upper side of the left half surface and a second end 22b on the lower side of the right half surface.

[0028] Next, as shown in FIG. 5(b), a magnetic paste to be the magnetic layer 16L is printed on the left half surface. Thereby, only the first end 22a of the ends 22a, 22b of the coil layer 22 is covered with the magnetic paste.

[0029] Then, as shown in FIG. 5(c), a conductive paste that becomes the coil layer 21 is printed. The coil layer 21 has a first end portion 21a on the lower side of the right half surface and a second end portion 21b on the upper side of the left half surface. The first end portion 21a of the coil layer 21 located on the right half surface overlaps and is joined to the second end portion 22b of the coil layer 22 exposed from the magnetic body layer 16L. The second end portion 21b of the coil layer 21 located on the left half surface is provided on the magnetic body layer 16L. Therefore, the first end portion 21a and the second end portion 21b of the coil layer 21 are at different height positions with respect to the stacking direction of the base body 12. More specifically, the second end portion 21b is located closer to the end face 12a side (the front side of the paper surface in FIG. 5) than the first end portion 21a.

[0030] Furthermore, as shown in FIG. 5(d), a magnetic body paste that becomes the magnetic body layer 16R is printed on the right half surface. Thereby, only the first end portion 21a of the end portions 21a and 21b of the coil layer 21 is covered with the magnetic body paste.

[0031] Subsequently, as shown in FIG. 6(a), the conductive paste that becomes the coil layer 22 is printed again. The first end portion 22a of the coil layer 22 located on the left half surface overlaps and is joined to the second end portion 21b of the coil layer 21 exposed from the magnetic body layer 16R. The second end portion 22b of the coil layer 22 located on the right half surface is provided on the magnetic body layer 16R. Therefore, the first end portion 22a and the second end portion 22b of the coil layer 22 are at different height positions with respect to the stacking direction of the base body 12. More specifically, the second end portion 22b is located closer to the end face 12a side (the front side of the paper surface in FIG. 6) than the first end portion 22a.

[0032] Then, as shown in FIG. 6(b), the magnetic body paste that becomes the magnetic body layer 16L is printed on the left half surface again. Thereby, only the first end portion 22a of the end portions 22a and 22b of the coil layer 22 is covered with the magnetic body paste.

[0033] Further, as shown in FIG. 6(c), a conductive paste that becomes the coil layer 21A is printed. The coil layer 21A has substantially the same configuration as the above-described coil layer 21, and differs from the coil layer 21 only in the position of the second end portion 21b. The second end portion 21b of the coil layer 21A is positionally adjusted for connection to a lead conductor 30 described later. The second end portion 21b of the coil layer 21A is located substantially in the middle of the left half surface (substantially in the middle in the vertical direction in FIG. 6(c)). The first end portion 21a of the coil layer 21A overlaps and is joined to the second end portion 22b of the coil layer 22 exposed from the magnetic body layer 16L. The second end portion 21b of the coil layer 21A is provided on the magnetic body layer 16L. Also in the coil layer 21A, similar to the coil layer 21, the first end portion 21a and the second end portion 21b are at different height positions with respect to the stacking direction of the base body 12.

[0034] Thereafter, as shown in FIG. 6(d), again, a magnetic body paste that becomes the magnetic body layer 16R is printed on the right half surface. Thereby, only the first end portion 21a of the end portions 21a and 21b of the coil layer 21A is covered with the magnetic body paste.

[0035] One turn of the coil 20 is formed by the printed lamination of the coil layer 21 in FIG. 5(c), the magnetic body layer 16R in FIG. 5(d), the coil layer 22 in FIG. 6(a), and the magnetic body layer 16L in FIG. 6(b) described above. By repeating a plurality of sets of these, a coil 20 composed of a plurality of turns is formed.

[0036] As shown in FIG. 3, a pair of lead conductors 30 are respectively provided between the coil 20 and the end faces 12a and 12b of the base body 12. Each lead conductor 30 is electrically connected to the end portion of the coil 20 and is exposed from the end faces 12a and 12b of the base body 12 to be connected to the external electrodes 14A and 14B. In the present embodiment, the length of the lead conductor 30 in the stacking direction of the base body 12 is 0.15 mm. With respect to the stacking direction of the base body 12, the length of the lead conductor 30 can be designed to be in the range of 5 to 25% of the length of the base body 12.

[0037] FIG. 7 is an exploded perspective view showing the laminated structure of the lead conductor 30 portion of the base body 12. As shown in FIG. 7, the lead conductor 30 includes an exposed layer 31 exposed from the end faces 12a and 12b and a plurality of lead layers 32, which are laminated to form the lead conductor 30. The exposed layer 31 and the lead layers 32 constituting each lead conductor 30 are made of a conductive material containing a metal such as Ag. Each lead conductor 30 is formed by a printing method, similar to the coil 20. Specifically, each lead conductor 30 is obtained by applying a conductive paste (for example, an Ag paste) that becomes the exposed layer 31 and the lead layers 32 onto the magnetic paste that becomes the magnetic layers 16L and 16R and baking them. The thickness of each of the exposed layer 31 and the lead layers 32 is, for example, 20 μm.

[0038] In the portion of the lead conductor 30 of the internal conductor 18, the lead layers 32 constituting the lead conductor 30 and the magnetic layers 16L and 16R constituting the base body 12 are alternately laminated. The exposed layer 31 is provided on the uppermost lead layer 32.

[0039] The exposed layer 31 is circular when viewed from the lamination direction of the base body 12 and is located on the coil axis Z of the coil 20. Each of the lead layers 32 is I-shaped when viewed from the lamination direction of the base body 12 and is located on the coil axis Z of the coil 20. In the present embodiment, the lead layers 32 have the same dimensions. The plurality of lead layers 32 are entirely overlapped when viewed from the lamination direction of the base body 12. The plurality of lead layers 32 are arranged in the lamination direction of the base body 12, and the end portions 32a and 32b of adjacent lead layers 32 overlap and are joined together.

[0040] When viewed from the lamination direction of the base body 12, the area of the exposed layer 31 is designed to be larger than the area of the lead layer 32. In particular, the exposed layer 31 is designed to have a larger area than the uppermost lead layer 32.

[0041] FIGS. 8 and 9 are diagrams showing the procedure for forming the lead conductor 30 by the printing method.

[0042] First, as shown in FIG. 8(a), a conductive paste that will become the lead-out layer 32 is printed on the coil layer 21A shown in FIG. 6(d). In FIGS. 8 and 9, the lead-out layer 32 having an I-shape extends in the left-right direction and has a left end portion 32a and a right end portion 32b. The left end portion 32a of the lead-out layer 32 overlaps and is joined to the second end portion 21b of the coil layer 21 exposed from the magnetic body layer 16R. The right end portion 32b of the lead-out layer 32 is provided on the magnetic body layer 16R. In the lead-out layer 32, the left end portion 32a and the right end portion 32b are at different height positions with respect to the stacking direction of the base body 12. More specifically, the right end portion 32b is located on the end face 12a side (the front side of the paper surface in FIG. 8) with respect to the left end portion 32a.

[0043] Next, as shown in FIG. 8(b), a magnetic body paste that will become the magnetic body layer 16L is printed on the left half surface. Thereby, only the left end portion 32a of the end portions 32a and 32b of the lead-out layer 32 is covered with the magnetic body paste.

[0044] Then, as shown in FIG. 8(c), again, a conductive paste that will become the lead-out layer 32 is printed. The right end portion 32b of the lead-out layer 32 overlaps and is joined to the right end portion 32b of the lead-out layer 32 exposed from the magnetic body layer 16L. The left end portion 32a of the lead-out layer 32 is provided on the magnetic body layer 16L. Therefore, the left end portion 32a and the right end portion 32b of the lead-out layer 32 are at different height positions with respect to the stacking direction of the base body 12. More specifically, the left end portion 32a located on the magnetic body layer 16L is located on the end face 12a side (the front side of the paper surface in FIG. 8) with respect to the right end portion 32b.

[0045] Furthermore, as shown in FIG. 8(d), a magnetic body paste that will become the magnetic body layer 16R is printed on the right half surface. Thereby, only the right end portion 32b of the end portions 32a and 32b of the lead-out layer 32 is covered with the magnetic body paste.

[0046] Subsequently, as shown in Fig. 9(a), the conductive paste that will become the extraction layer 32 is printed again. The left end portion 32a of the extraction layer 32 overlaps and is joined to the left end portion 32a of the extraction layer 32 exposed from the magnetic body layer 16R. The right end portion 32b of the extraction layer 32 is provided on the magnetic body layer 16R. Therefore, the right end portion 32b located on the magnetic body layer 16R is positioned closer to the end face 12a side (the front side of the paper in Fig. 9) than the left end portion 32a.

[0047] Then, as shown in Fig. 9(b), the magnetic paste that will become the magnetic body layer 16L is printed again on the left half. As a result, only the left end portion 32a of the end portions 32a and 32b of the extraction layer 32 is covered with the magnetic paste.

[0048] Furthermore, as shown in Fig. 9(c), the conductive paste that will become the extraction layer 32 is printed again. The right end portion 32b of the extraction layer 32 overlaps and is joined to the right end portion 32b of the extraction layer 32 exposed from the magnetic body layer 16L. The left end portion 32a of the extraction layer 32 is provided on the magnetic body layer 16L. Therefore, the left end portion 32a located on the magnetic body layer 16L is positioned closer to the end face 12a side (the front side of the paper in Fig. 9) than the right end portion 32b.

[0049] By the printing and lamination of the extraction layer 32 in Fig. 8(c), the magnetic body layer 16R in Fig. 8(d), the extraction layer 32 in Fig. 9(a), and the magnetic body layer 16L in Fig. 9(b) described above, a pair of extraction layers 32 joined to each other is formed. Taking these as one set and repeating a plurality of sets, an extraction conductor 30 including a plurality of pairs of extraction layers 32 can be formed.

[0050] After that, as shown in Fig. 9(d), the conductive paste that will become the exposed layer 31 is printed. The periphery of the exposed layer 31 may be filled with the magnetic paste.

[0051] Fig. 10 is a cross-sectional view showing the extraction conductor 30 exposed at the end face 12a of the base body 12. Regarding the extraction conductor 30 at the end face 12b of the base body 12, since it is the same as the extraction conductor 30 at the end face 12a of the base body 12, the description thereof is omitted.

[0052] As shown in FIG. 10, the plurality of lead-out layers 32 are respectively interposed between the magnet layers 16R laminated alternately. Therefore, the left end portion 32a and the right end portion 32b of each lead-out layer 32 are at different height positions with respect to the lamination direction of the base body 12, and the plurality of lead-out layers 32 overlap in a zigzag manner. In the lead-out conductor 30, as shown by the arrow in FIG. 10, the current path also becomes zigzag. In FIG. 10, the plurality of lead-out layers 32 are shown as overlapping in a bellows shape. The plurality of lead-out layers 32 may be continuously overlapped in a Z shape.

[0053] As described above, the laminated coil component 10 includes a plurality of magnet layers 16R and 16L laminated, a base body 12 (fired base body) having a pair of end faces 12a and 12b facing each other in a first direction parallel to the lamination direction of the plurality of magnet layers 16R and 16L, a coil 20 provided in the base body 12 and having a coil axis Z parallel to the first direction, a pair of external electrodes 14A and 14B respectively provided on the end faces 12a and 12b of the base body 12, and a pair of lead-out conductors 30 respectively provided between the end portions of the coil 20 and the end faces 12a and 12b of the base body 12, electrically connected to the end portions of the coil 20 and exposed from the end faces 12a and 12b of the base body 12 to be connected to the external electrodes 14A and 14B. Each lead-out conductor 30 includes a plurality of lead-out layers 32, and each lead-out layer 32 has a left end portion 32a and a right end portion 32b. The left end portion 32a and the right end portion 32b are at different height positions with respect to the first direction, and are displaced from each other when viewed in the first direction. Between adjacent lead-out layers 32 in the first direction, the end portions 32a and 32b (second end portions) located above the other lead-out layer 32 in the lamination direction and the end portions 32a and 32b (first end portions) located below the other lead-out layer 32 in the lamination direction overlap each other.

[0054] In the above-described multilayer coil component 10, the lead-out conductor 30 is exposed from the end faces 12a and 12b of the base body 12 and is connected to the external electrodes 14A and 14B provided on the end faces 12a and 12b. When the lead-out conductor 30 is led out from the end faces 12a and 12b of the base body 12, the lead-out area can be easily enlarged as compared with the case where it is led out to the side faces 12c to 12f of the base body 12. For example, the exposed layer 31 of the lead-out conductor 30 exposed from the end faces 12a and 12b of the base body 12 can easily enlarge the area (i.e., the lead-out area) when viewed from the stacking direction of the base body 12, and the area can be enlarged with respect to the cross-sectional area of the lead-out layer 32 or the coil layers 21 and 22. Therefore, by connecting the coil 20 and the external electrodes 14A and 14B via the lead-out conductor 30, high connectivity between the coil 20 and the external electrodes 14A and 14B is realized.

[0055] Note that the lead-out conductor 30 of the multilayer coil component 10 is designed to reduce the electrode volume. For comparison, FIG. 11 shows a lead-out conductor 30A composed of a plurality of via conductors 33. Each via conductor 33 is provided penetrating the magnetic body layer 16A constituting the base body 12. The plurality of via conductors 33 are arranged linearly along the stacking direction of the base body 12. In the lead-out conductor 30A, the current path also becomes linear as shown by the arrow in FIG. 11. In the lead-out conductor 30A shown in FIG. 11, since each via conductor 33 is provided so as to fill the through hole of the magnetic body layer 16A, each via conductor 33 has a relatively large volume. Therefore, the electrode volume of the lead-out conductor 30A in which the plurality of via conductors 33 are combined becomes large. In this case, cracks are likely to occur due to the shrinkage difference between the via conductor 33 and the magnetic body layer 16A during firing. On the other hand, the lead-out conductor 30 of the multilayer coil component 10 has a relatively small volume because the lead-out layer 32 does not penetrate the magnetic body layers 16R and 16L. Therefore, in the multilayer coil component 10, crack suppression is achieved.

[0056] Also, in the multilayer coil component 10, the length of the lead-out conductor 30 in the first direction is designed to be 5% or more of the length of the base body 12 in the first direction and not more than the inner diameter of the coil 20.

[0057] Furthermore, in the multilayer coil component 10, the lead-out conductor 30 includes an exposed layer 31 (first lead-out layer) exposed on the end face of the base body 12 and the uppermost lead-out layer 32 (second lead-out layer) overlapping the exposed layer 31 on the coil 20 side, and is designed such that the area of the exposed layer 31 when viewed from the first direction is larger than the area of the uppermost lead-out layer 32.

[0058] As described above, the embodiments of the present invention have been described. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the gist thereof. For example, the exposed layer 31 of the lead-out conductor 30 is not limited to one layer and may be composed of a plurality of layers. The lead-out conductor 30 may be configured by a plurality of lead-out layers 32 without including the exposed layer 31. The lead-out layers 32 of the lead-out conductor 30 may be a pair or a plurality of pairs. The coil 20 may be annular, rectangular annular, or elliptical annular when viewed from the stacking direction of the base body 12.

Explanation of Reference Numerals

[0059] 10... Multilayer coil component, 12... Base body, 12a, 12b... End faces, 14A, 14B... External electrodes, 16R, 16L... Magnetic body layers, 20... Coil, 21, 22... Coil layers, 30... Lead-out conductor, 31... Exposed layer, 32... Lead-out layer, Z... Coil axis.

Claims

1. A sintered body including a plurality of stacked layers and having a pair of end faces facing each other in a first direction parallel to a stacking direction of the plurality of layers; a coil provided in the sintered body and having a coil axis parallel to the first direction; A pair of external electrodes provided on end surfaces of the sintered body, a pair of lead conductors provided between the ends of the coil and the end faces of the sintered body, the lead conductors being electrically connected to the ends of the coil and exposed from the end faces of the sintered body to be connected to the external electrodes; Equipped with the lead conductor includes a first end and a second end located closer to the end face than the first end and displaced from the first end when viewed from the first direction, and includes a plurality of lead layers overlapping in the first direction; The first end of one of the lead layers adjacent to each other in the first direction overlaps with the second end of the other lead layer, a first lead layer exposed on an end surface of the sintered body, and a second lead layer overlapping the first lead layer on the coil side and not penetrating the layers of the sintered body, wherein the area of the first lead layer is larger than the area of the second lead layer when viewed from the first direction.

2. The laminated coil component according to claim 1 , wherein the plurality of lead layers each have an I-shape when viewed from the first direction and overlap each other in a zigzag manner.

3. 3. The laminated coil component according to claim 1, wherein a length of the lead conductor in the first direction is 5% or more of a length of the sintered body in the first direction and is equal to or less than an inner diameter of the coil.

4. The laminated coil component according to any one of claims 1 to 3, wherein the sintered body has a printed laminate structure.

5. A laminated coil component described in any one of claims 1 to 4, further comprising a magnetic paste filling in the periphery of the first lead layer.

Images