Multilayer coil component

Abstract

To provide a laminated coil component capable of suppressing deterioration of characteristics.SOLUTION: A laminated coil component 1 includes an element assembly 2 and a coil 10 disposed in the element assembly 2 while having a coil axis along the first direction D1, and terminal electrodes 3, 4 electrically connected to the coil 10. The terminal electrodes 3, 4 have electrode sections 3b, 4b provided on a principal surface 2c, and the coil 10 has a plurality of coil conductors 11, 12, 13. The width W1 of the first coil conductor 11 disposed closest to the principle surface 2c side among the plurality of coil conductors 11, 12, 13 while facing the electrode sections 3b, 4b is narrower than the width W2 of the second coil conductor 12 disposed closer to the principle surface 2d side than the first coil conductor 11, and the aspect ratio H1 / W1 of the first coil conductor 11 is higher than the aspect ratio H2 / W2 of the second coil conductor 12.SELECTED DRAWING: Figure 5

Description

Technical Field

[0006] ,

[0001] This disclosure relates to a multilayer coil component.

Background Art

[0002] Patent Document 1 describes a multilayer inductor including a laminate formed by laminating a plurality of magnetic layers, a coil disposed in the laminate, and an external electrode provided on the lower surface of the laminate. In this multilayer inductor, the coil and the external electrode are disposed opposite to each other.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above - mentioned multilayer inductor, a stray capacitance (parasitic capacitance) is formed between the coil and the external electrode. As a result, the characteristics of the multilayer inductor deteriorate.

[0005] One aspect of this disclosure provides a multilayer coil component capable of suppressing deterioration of characteristics.

Means for Solving the Problems

[0007] In this laminated coil component, the first coil conductor is positioned on the furthest main surface side of the multiple coil conductors and faces the main surface electrode portion. Therefore, a stray capacitance is formed between the first coil conductor and the main surface electrode portion, depending on the area where the first coil conductor and the main surface electrode portion face each other. The width of the first coil conductor is narrower than the width of the second coil conductor, which is positioned on the other main surface side. Therefore, the area where the first coil conductor and the main surface electrode portion face each other is smaller compared to the case where the width of the first coil conductor is approximately the same as the width of the second coil conductor. As a result, the stray capacitance formed between the first coil conductor and the main surface electrode portion can be reduced. This suppresses a decrease in the self-resonant frequency (SRF) of the laminated coil component. The aspect ratio of the first coil conductor is higher than that of the second coil conductor. Therefore, the cross-sectional area of ​​the first coil conductor can be increased compared to the case where the aspect ratio of the first coil conductor is approximately the same as that of the second coil conductor. This suppresses a decrease in the Q value of the laminated coil component. From the above, the deterioration of the characteristics of the laminated coil component is suppressed.

[0008] The cross-sectional area of ​​the first coil conductor may be equal to that of the second coil conductor. In this case, the decrease in the Q factor is reliably suppressed.

[0009] The width of the multiple coil conductors may be narrower on one main surface side, and the aspect ratio of the multiple coil conductors may be higher on one main surface side. In this case, the degradation of the characteristics of the laminated coil component is further suppressed.

[0010] When viewed from the first direction, the outer edge of the first coil conductor may coincide with the outer edge of the second coil conductor. In this case, the inner diameter of the first coil conductor becomes larger, which can improve the Q value and inductance (L).

[0011] The terminal electrode further has an end-face electrode portion provided on the end face, and the first coil conductor faces the end-face electrode portion. When viewed from the first direction, the inner edge of the first coil conductor may coincide with the inner edge of the second coil conductor. In this case, the distance between the first coil conductor and the end-face electrode portion is increased, so the stray capacitance formed between the first coil conductor and the end-face electrode portion can be reduced. This further suppresses the decrease in the self-resonant frequency of the laminated coil component.

[0012] The coil includes a pair of first coil regions facing each other across the coil axis in a second direction, and a pair of second coil regions facing each other across the coil axis in a third direction. Viewed from the first direction, in the first coil region, the inner edge of the first coil conductor coincides with the inner edge of the second coil conductor, and in the first coil region, the outer edge of the first coil conductor may coincide with the outer edge of the second coil conductor. In this case, the distance between the first coil conductor and the end electrode portion increases in the second coil region, so that the stray capacitance formed between the first coil conductor and the end electrode portion can be reduced. This suppresses a decrease in the self-resonant frequency of the laminated coil component. Also, in the second coil region, the inner diameter of the first coil conductor increases, so that the Q value and inductance (L) can be improved. From the above, it is possible to improve the Q value and inductance (L) while further suppressing a decrease in the self-resonant frequency of the laminated coil component. [Effects of the Invention]

[0013] According to one aspect of the present invention, a laminated coil component is provided that can suppress the peeling of terminal electrodes. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a perspective view of a laminated coil component according to the first embodiment. [Figure 2] Figure 2 is a top view of the laminated coil component shown in Figure 1. [Figure 3] Figure 3 is a side view of the laminated coil component shown in Figure 1. [Figure 4] Figure 4 is a cross-sectional view along the line IV-IV in Figure 1. [Figure 5] Figure 5 is a cross-sectional view along the VV line in Figure 1. [Figure 6] Figure 6 is a perspective view of a laminated coil component according to the second embodiment. [Figure 7] FIG. 7 is a top view of the multilayer coil component of FIG. 6. [Figure 8] FIG. 8 is a side view of the multilayer coil component of FIG. 6. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 6. [Figure 10] FIG. 10 is a cross-sectional view taken along line X-X of FIG. 6. [[ID=*14]]

DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted.

[0016] (First Embodiment) Referring to FIGS. 1 to 5, the multilayer coil component 1 according to the first embodiment will be described. The multilayer coil component 1 includes a rectangular parallelepiped-shaped body 2, terminal electrodes 3 and 4 respectively disposed at both ends of the body 2, a coil 10, and connection conductors 23 and 24. The rectangular parallelepiped shape includes a shape of a rectangular parallelepiped with chamfered corners and ridge lines, and a shape of a rectangular parallelepiped with rounded corners and ridge lines. In FIGS. 1 to 3, the body 2 is shown by a broken line.

[0017] The body 2 has end faces 2a and 2b facing each other, main faces 2c and 2d facing each other, and side faces 2e and 2f facing each other. Hereinafter, the direction in which the main faces 2c and 2d face each other is the first direction D1, the direction in which the end faces 2a and 2b face each other is the second direction D2, and the direction in which the side faces 2e and 2f face each other is the third direction D3. The first direction D1, the second direction D2, and the third direction D3 intersect (here, are orthogonal) to each other. In the present embodiment, the first direction D1 is the height direction of the body 2. The second direction D2 is the length direction of the body 2. The second direction D*2* is also the long side direction of the main faces 2c and 2d. The third direction D3 is the width direction of the body 2. The third direction D*3* is also the short side direction of the main faces 2c and 2d.

[0018] Note: There seems to be a small error in the original text where "第二方向D2は、主面2c,2dの長辺方向でもある。" and "第三方向D*3*は、主面2c,2dの短辺方向でもある。" should probably be "第二方向D2は、主面2c,2dの長辺方向でもある。" and "第三方向D3は、主面2c,2dの短辺方向でもある。" respectively in the English translation for better consistency. I've made the correction in the translation above.The end faces 2a, 2b extend in the first direction D1 so as to connect between the main faces 2c, 2d. The end faces 2a, 2b also extend in the third direction D3 so as to connect between the side faces 2e, 2f. The main faces 2c, 2d extend in the second direction D2 so as to connect between the end faces 2a, 2b. The main faces 2c, 2d also extend in the third direction D3 so as to connect between the side faces 2e, 2f. The side faces 2e, 2f extend in the second direction D2 so as to connect between the end faces 2a, 2b. The side faces 2e, 2f also extend in the first direction D1 so as to connect between the main faces 2c, 2d. The laminated coil component 1 is, for example, soldered to an electronic device (for example, a circuit board or an electronic component). In the laminated coil component 1, the main face 2c constitutes a mounting face facing the electronic device.

[0019] The body 2 is formed by laminating a plurality of insulator layers (not shown) in the first direction D1. The body 2 has a plurality of insulator layers laminated in the first direction D1. In the body 2, the lamination direction in which the plurality of insulator layers are laminated coincides with the first direction D1. In the actual body 2, each insulator layer is integrated to such an extent that the boundary between each insulator layer is not visible.

[0020] Each insulator layer is formed of a dielectric material containing a glass component. That is, the body 2 contains a dielectric material containing a glass component as a compound of the elements constituting the body 2. The glass component is, for example, borosilicate glass or the like. As the dielectric material, for example, dielectric ceramics such as BaTiO3 - based, Ba(Ti,Zr)O3 - based, or (Ba,Ca)TiO3 - based are used. Each insulator layer 6 is composed of a sintered body of a ceramic green sheet containing a glass - ceramic material.

[0021] Terminal electrodes 3 and 4 are electrically connected to coil 10. Terminal electrodes 3 and 4 are located at both ends of the base body 2 in the second direction D2. Terminal electrodes 3 and 4 are spaced apart from each other in the second direction D2. Terminal electrodes 3 and 4 are embedded in the base body 2. Terminal electrodes 3 and 4 are located in a pair of recesses provided at both ends of the base body 2 in the second direction D2. The pair of recesses are formed in shapes corresponding to terminal electrodes 3 and 4. Terminal electrodes 3 and 4 are in contact with the inner surfaces of the pair of recesses. Terminal electrodes 3 and 4, for example, have the same shape as each other.

[0022] The terminal electrode 3 is provided on the end face 2a side of the base body 2. The terminal electrode 3 is provided across the end face 2a and the main face 2c. The terminal electrode 3 is positioned in a recess provided across the end face 2a and the main face 2c of the base body 2. In this embodiment, the surface of the terminal electrode 3 is substantially flush with the end face 2a and the main face 2c, respectively.

[0023] The terminal electrode 3 has an L-shape when viewed from the third direction D3. The terminal electrode 3 has an electrode portion 3a and an electrode portion 3b. The electrode portion 3a and the electrode portion 3b are connected at the edge of the base body 2 (the corner formed by the main surface 2c and the end surface 2a) and are electrically connected to each other. In this embodiment, the electrode portion 3a and the electrode portion 3b are provided integrally and are continuous with each other. The electrode portion 3a is provided on the end surface 2a and extends along the first direction D1. The electrode portion 3a has a rectangular shape when viewed from the second direction D2. The electrode portion 3b is provided on the main surface 2c and extends along the second direction D2. The electrode portion 3b has a rectangular shape when viewed from the first direction D1.

[0024] The terminal electrode 4 is provided on the end face 2b side of the base body 2. The terminal electrode 4 is provided across the end face 2b and the main surface 2c. The terminal electrode 4 is positioned in a recess provided across the end face 2b and the main surface 2c of the base body 2. In this embodiment, the surface of the terminal electrode 4 is substantially flush with the end face 2b and the main surface 2c, respectively.

[0025] The terminal electrode 4 has an L-shape when viewed from the third direction D3. The terminal electrode 4 has an electrode portion 4a and an electrode portion 4b. The electrode portion 4a and the electrode portion 4b are connected at the edge of the base body 2 (the corner formed by the main surface 2c and the end surface 2b) and are electrically connected to each other. In this embodiment, the electrode portion 4a and the electrode portion 4b are provided integrally and are continuous with each other. The electrode portion 4a is provided on the end surface 2b and extends along the first direction D1. The electrode portion 4a has a rectangular shape when viewed from the second direction D2. The electrode portion 4b is provided on the main surface 2c and extends along the second direction D2. The electrode portion 4b has a rectangular shape when viewed from the first direction D1.

[0026] The terminal electrodes 3 and 4 are constructed, for example, by stacking multiple electrode layers. Each electrode layer is provided in a defect formed in the corresponding insulating layer. The multiple defects constitute a pair of recesses in which the terminal electrodes 3 and 4 are placed. The electrode layers are formed by firing a conductive paste. The conductive paste contains a metal component and a glass component. The metal component is contained in the conductive material and is, for example, Ag or Pd. The glass component is a compound of the elements that make up the base material 2 and is the same component as the glass component contained in the base material 2. The content of the glass component can be set as appropriate. In the terminal electrodes 3 and 4, the multiple electrode layers are integrated to such an extent that the boundaries between the electrode layers are not visible.

[0027] The coil 10 and connecting conductors 23 and 24 are arranged inside the base body 2 and are not exposed from the base body 2. The coil 10 has a pair of ends 10a. One end 10a is electrically connected to the terminal electrode 4 by the connecting conductor 23. The other end 10a is electrically connected to the terminal electrode 3 by the connecting conductor 24. The coil 10 has a coil axis AX along the first direction D1.

[0028] The coil 10 has a plurality of coil conductors 11, 12, 13 and through-hole conductors 21, 22 (see Figure 3). In this embodiment, the coil 10 has a first coil conductor 11, a second coil conductor 12, and a third coil conductor 13. The first coil conductor 11, the second coil conductor 12, and the third coil conductor 13 are spaced apart from each other in the first direction D1. The plurality of coil conductors 11, 12, 13 are arranged along the first direction D1 in the order of the first coil conductor 11, the second coil conductor 12, and the third coil conductor 13.

[0029] The first coil conductor 11 is positioned closest to the main surface 2c (closest to the main surface 2c) and faces the main surface 2c in the first direction D1. The first coil conductor 11 faces the electrode portions 3b and 4b, respectively, in the first direction D1. The third coil conductor 13 is positioned closest to the main surface 2d (closest to the main surface 2d) and faces the main surface 2d in the first direction D1. The second coil conductor 12 is positioned between the first coil conductor 11 and the third coil conductor 13 in the first direction D1. The second coil conductor 12 and the third coil conductor 13 are positioned closer to the main surface 2d (closer to the main surface 2d) than the first coil conductor 11.

[0030] The first coil conductor 11, the second coil conductor 12, and the third coil conductor 13 each have a shape in which a portion of the loop is interrupted, and each has one end and the other end. The first coil conductor 11, the second coil conductor 12, and the third coil conductor 13 are electrically connected to each other.

[0031] One end of the first coil conductor 11 is connected to the electrode portion 4a via a connecting conductor 23. The one end of the first coil conductor 11 constitutes one end 10a of the coil 10. The connecting conductor 23 extends along the second direction D2 and connects the one end of the first coil conductor 11 to the electrode portion 4a. In this embodiment, the first coil conductor 11 and the connecting conductor 23 are formed integrally.

[0032] The other end of the first coil conductor 11 is connected to one end of the second coil conductor 12 via a through-hole conductor 21. The through-hole conductor 21 extends along the first direction D1 and connects the other end of the first coil conductor 11 to one end of the second coil conductor 12. Viewed from the first direction D1, the other end of the first coil conductor 11 and one end of the second coil conductor 12 overlap each other.

[0033] The other end of the second coil conductor 12 is connected to one end of the third coil conductor 13 via a through-hole conductor 22. The through-hole conductor 22 extends along the first direction D1 and connects the other end of the second coil conductor 12 to one end of the third coil conductor 13. Viewed from the first direction D1, the other end of the second coil conductor 12 and one end of the third coil conductor 13 overlap each other.

[0034] The other end of the third coil conductor 13 is connected to the electrode portion 3a via a connecting conductor 24. The other end of the third coil conductor 13 constitutes the other end 10a of the coil 10. The connecting conductor 24 extends along the second direction D2 and connects the other end of the third coil conductor 13 to the electrode portion 3a. In this embodiment, the third coil conductor 13 and the connecting conductor 24 are formed integrally.

[0035] The coil 10 has a rectangular annular shape when viewed from the first direction D1. The coil 10 includes a pair of first coil regions R1 and a pair of second coil regions R2. The pair of first coil regions R1 face each other across the coil axis AX in the second direction D2. The pair of second coil regions R2 face each other across the coil axis AX in the third direction D3.

[0036] In this embodiment, the first coil region R1 on the end face 2a side (closer to end face 2a) is arranged with a first coil conductor 11 and a second coil conductor 12, extending along the third direction D3 and facing the end face 2a and the electrode portion 3a. The first coil region R1 on the end face 2b side (closer to end face 2b) is arranged with a first coil conductor 11, a second coil conductor 12, and a third coil conductor 13, extending along the third direction D3 and facing the end face 2b and the electrode portion 3b.

[0037] In the second coil region R2 on the side 2e side (closer to side 2e), the first coil conductor 11, the second coil conductor 12, and the third coil conductor 13 are arranged, extending along the second direction D2 and facing side 2e. In the second coil region R2 on the side 2f side (closer to side 2f), the first coil conductor 11 and the second coil conductor 12 are arranged, extending along the second direction D2 and facing side 2f.

[0038] As shown in Figures 4 and 5, the width W1 of the first coil conductor 11 is narrower than the width W2 of the second coil conductor 12 and the width W3 of the third coil conductor 13. In this embodiment, width W2 is narrower than width W3. That is, the widths W1, W2, W3 of the multiple coil conductors 11, 12, 13 are narrower towards the main surface 2c. In other words, the coil conductors positioned towards the main surface 2c have narrower widths. Here, each width W1, W2, W3 is the length of each coil conductor 11, 12, 13 in the second direction D2 in the first coil region R1. Each width W1, W2, W3 is the length of each coil conductor 11, 12, 13 in the third direction D3 in the second coil region R2.

[0039] In this embodiment, the heights H1, H2, and H3 of the multiple coil conductors 11, 12, and 13 are equal to each other. Each height H1, H2, and H3 is the length of each coil conductor 11, 12, and 13 in the first direction D1. Since the heights H1, H2, and H3 are equal to each other, it is possible to suppress an increase in the height (length in the first direction D1) of the laminated coil component 1 compared to the case where height H1 is higher than heights H2 and H3, thereby achieving a lower profile. When the height of the laminated coil component 1 is set, it is possible to suppress a decrease in the number of turns of the coil 10. As a result, the inductance (L) of the laminated coil component 1 is maintained.

[0040] The aspect ratio H1 / W1 of the first coil conductor 11 is higher than the aspect ratio H2 / W2 of the second coil conductor 12 and the aspect ratio H3 / W3 of the third coil conductor 13. In this embodiment, the aspect ratio H2 / W2 is higher than the aspect ratio H3 / W3. That is, the aspect ratios H1 / W1, H2 / W2, and H3 / W3 of the multiple coil conductors 11, 12, and 13 are higher towards the main surface 2c. In other words, coil conductors positioned towards the main surface 2c have higher aspect ratios.

[0041] In this embodiment, the cross-sectional area of ​​the first coil conductor 11 is smaller than the cross-sectional area of ​​the second coil conductor 12 and the cross-sectional area of ​​the third coil conductor 13. The cross-sectional area of ​​the second coil conductor 12 is smaller than the cross-sectional area of ​​the third coil conductor 13. In other words, the cross-sectional areas of the multiple coil conductors 11, 12, and 13 are smaller the closer they are to the main surface 2c. To put it another way, the coil conductors positioned closer to the main surface 2c have smaller cross-sectional areas. Here, the cross-sectional area of ​​each coil conductor 11, 12, and 13 is the cross-sectional area perpendicular to the axial direction of each coil conductor 11, 12, and 13.

[0042] The width W1 and height H1 are constant throughout the entire first coil conductor 11. The width W2 and height H2 are constant throughout the entire second coil conductor 12. The width W3 and height H3 are constant throughout the entire third coil conductor 13.

[0043] As shown in Figure 4, in the second coil region R2 on the side 2e side, when viewed from the first direction D1, the outer edge 11a of the first coil conductor 11 coincides with the outer edge 12a of the second coil conductor 12 and the outer edge 13a of the third coil conductor 13. The inner edge 11b of the first coil conductor 11 is located further out (towards side 2e) than the inner edge 12b of the second coil conductor 12 and the inner edge 13b of the third coil conductor 13. When viewed from the first direction D1, the inner edge 12b is located further out than the inner edge 13b. In other words, the inner edges 11b, 12b, and 13b of the multiple coil conductors 11, 12, and 13 are located further out the closer they are to the main surface 2c. To put it another way, the inner edges of the coil conductors located closer to the main surface 2c are located further out. In the second coil region R2 on the side 2f side, when viewed from the first direction D1, the outer edge 11a coincides with the outer edge 12a. The inner edge 11b is located outside (towards the side 2f) of the inner edge 12b.

[0044] As shown in Figure 5, in the first coil region R1 on the end face 2b side, when viewed from the first direction D1, the inner edge 11b coincides with the inner edges 12b and 13b. The outer edge 11a is located inside (towards the end face 2a) of the outer edges 12a and 13a. When viewed from the first direction D1, the outer edge 12a is located inside the outer edge 13a. In other words, the outer edges 11a, 12a, and 13a of the multiple coil conductors 11, 12, and 13 are located further inside towards the main surface 2c. To put it another way, the outer edges of the coil conductors are located further inside towards the main surface 2c. In the first coil region R1 on the end face 2a side, when viewed from the first direction D1, the inner edge 11b coincides with the inner edge 12b. The outer edge 11a is located inside (towards the end face 2b) of the outer edge 12a.

[0045] The first coil conductor 11, the second coil conductor 12, the third coil conductor 13, and the connecting conductors 23 and 24 contain a conductive material. The conductive material contains either Ag or Pd. The first coil conductor 11, the second coil conductor 12, the third coil conductor 13, and the connecting conductors 23 and 24 are constructed as sintered bodies of a conductive paste containing conductive material powder. The conductive material powder contains, for example, Ag powder or Pd powder.

[0046] In this embodiment, the first coil conductor 11, the second coil conductor 12, the third coil conductor 13, and the connecting conductors 23 and 24 contain the same conductive material as the terminal electrodes 3 and 4. The first coil conductor 11, the second coil conductor 12, the third coil conductor 13, and the connecting conductors 23 and 24 may contain a different conductive material than the terminal electrodes 3 and 4.

[0047] The first coil conductor 11, the second coil conductor 12, the third coil conductor 13, and the connecting conductors 23 and 24 are provided in the defects formed in the corresponding insulating layers. The first coil conductor 11, the second coil conductor 12, the third coil conductor 13, and the connecting conductors 23 and 24 are formed by firing a conductive paste located within the defects formed in the green sheet.

[0048] The defects formed in the green sheet are formed, for example, by the following process. First, a green sheet is formed by applying a base paste containing the constituent materials of the insulating layer and a photosensitive material onto a substrate. The substrate is, for example, a PET film. The photosensitive material contained in the base paste may be either negative or positive type, and known materials can be used. Next, the green sheet is exposed and developed by photolithography using a mask corresponding to the defects to form defects in the green sheet on the substrate. The green sheet with the defects formed is a base pattern.

[0049] The electrode layer, the first coil conductor 11, the second coil conductor 12, the third coil conductor 13, and the connecting conductors 23 and 24 are formed, for example, by the following process.

[0050] First, a conductive material layer is formed by applying a conductive paste containing a photosensitive material onto a substrate. The photosensitive material contained in the conductive paste may be either negative or positive type, and known types can be used. Next, using a mask corresponding to the defect, the conductive material layer is exposed and developed by photolithography to form a conductive pattern on the substrate corresponding to the shape of the defect.

[0051] The laminated coil component 1 is obtained, for example, by the following process following the process described above. A sheet is prepared in which the base pattern and the conductor pattern are in the same layer by combining the conductor pattern with the conductor pattern in the missing parts of the base pattern. After heat treatment of the laminate obtained by stacking a predetermined number of the prepared sheets, a plurality of green chips are obtained from the laminate. In this process, for example, the green laminate is cut into chip shapes with a cutting machine. This gives a plurality of green chips of a predetermined size. Next, the green chips are fired. This firing gives the laminated coil component 1. A plating layer may be formed on the surface of each terminal electrode 3, 4. The plating layer is formed, for example, by electroplating or electroless plating. The plating layer contains, for example, Ni, Sn, or Au.

[0052] (Second embodiment) Referring to Figures 6 to 10, the laminated coil component 1A according to the second embodiment will be explained, focusing on the differences from the laminated coil component 1 (see Figures 1 to 5). In Figures 6 to 8, the base body 2 is shown by a dashed line. In the laminated coil component 1A, the terminal electrode 3 does not have an electrode portion 3a, but only an electrode portion 3b, and the terminal electrode 4 does not have an electrode portion 4a, but only an electrode portion 4b. The laminated coil component 1A has connecting conductors 25 and 26 instead of connecting conductors 23 and 24 of the laminated coil component 1. The connecting conductors 25 and 26 are, for example, columnar in shape with a circular cross-section and extend along the first direction D1. Connecting conductor 25 electrically connects the terminal electrode 4 to one end 10a of the coil 10. Connecting conductor 26 electrically connects the terminal electrode 3 to the other end 10a of the coil 10.

[0053] The first coil conductor 11 and the second coil conductor 12 have recesses formed in them at positions that overlap with the other end 10a of the coil 10 when viewed from the first direction D1. The recesses are provided to avoid interference with the connecting conductor 26. The inner surface of the recesses faces the outer surface of the connecting conductor 26. Due to the recesses, the connecting conductor 26 is positioned spaced apart from the first coil conductor 11 and the second coil conductor 12.

[0054] As shown in Figure 9, in the second coil region R2 on the side 2e side, when viewed from the first direction D1, the outer edge 11a coincides with the outer edges 12a and 13a. The inner edge 11b is located further out (towards side 2e) than the inner edges 12b and 13b. When viewed from the first direction D1, the inner edge 12b is located further out than the inner edge 13b. In other words, the inner edges 11b, 12b, and 13b of the multiple coil conductors 11, 12, and 13 are located further out towards the main surface 2c. To put it another way, the inner edges of the coil conductors are located further out towards the main surface 2c. In the second coil region R2 on the side 2f side, when viewed from the first direction D1, the outer edge 11a coincides with the outer edge 12a. The inner edge 11b is located further out (towards side 2f) than the inner edge 12b.

[0055] As shown in Figure 10, in the first coil region R1 on the end face 2b side, when viewed from the first direction D1, the outer edge 11a coincides with the outer edges 12a and 13a. The inner edge 11b is located further out (towards the end face 2b) than the inner edges 12b and 13b. When viewed from the first direction D1, the inner edge 12b is located further out than the inner edge 13b. In other words, the inner edges 11b, 12b, and 13b of the multiple coil conductors 11, 12, and 13 are located further out the closer they are to the main surface 2c. To put it another way, the further out the inner edge of a coil conductor is located, the closer it is to the main surface 2c. In the first coil region R1 on the end face 2a side, when viewed from the first direction D1, the outer edge 11a coincides with the outer edge 12a. The inner edge 11b is located further out (towards the end face 2a) than the inner edge 12b.

[0056] As explained above, in the laminated coil component 1,1A, the first coil conductor 11 is positioned furthest towards the main surface 2c among the multiple coil conductors 11,12,13, and faces the electrode portions 3b,4b. Therefore, a stray capacitance is formed between the first coil conductor 11 and the electrode portions 3b,4b, depending on the area where the first coil conductor 11 and the electrode portions 3b,4b face each other. The width W1 of the first coil conductor 11 is narrower than the width W2 of the second coil conductor 12, which is positioned closer to the main surface 2d than the first coil conductor 11. Therefore, the area where the first coil conductor 11 and the electrode portions 3b,4b face each other is smaller compared to the case where the width W1 is approximately the same as the width W2. Thus, the stray capacitance formed between the first coil conductor 11 and the electrode portions 3b,4b can be reduced. This suppresses a decrease in the self-resonant frequency of the laminated coil component 1,1A.

[0057] The aspect ratio H1 / W1 of the first coil conductor 11 is higher than the aspect ratio H2 / W2 of the second coil conductor 12. Therefore, the cross-sectional area of ​​the first coil conductor 11 can be increased compared to the case where the aspect ratio H1 / W1 is similar to that of H2 / W2. This suppresses a decrease in the Q value of the laminated coil components 1,1A. As a result, the deterioration of the characteristics of the laminated coil components 1,1A is suppressed.

[0058] The widths W1, W2, and W3 of the multiple coil conductors 11, 12, and 13 are narrower towards the main surface 2c. The aspect ratios H1 / W1, H2 / W2, and H3 / W3 of the multiple coil conductors 11, 12, and 13 are higher towards the main surface 2c. As a result, the degradation of the characteristics of the laminated coil components 1 and 1A is further suppressed.

[0059] In the laminated coil component 1,1A, in the second coil region R2, when viewed from the first direction D1, the outer edge 11a coincides with the outer edge 12a. The width W1 is narrower than the width W2. Therefore, when viewed from the first direction D1, the inner edge 11b is located outside the inner edge 12b. As a result, the inner diameter of the first coil conductor 11 is larger compared to the case where the inner edge 11b coincides with the inner edge 12b when viewed from the first direction D1. Thus, the Q value and inductance (L) can be improved.

[0060] In the laminated coil component 1A, the outer edge 11a coincides with the outer edge 12a when viewed from the first direction D1, not only in the second coil region R2 but also in the first coil region R1. Therefore, the Q value and inductance (L) can be further improved.

[0061] In the laminated coil component 1, the first coil conductor 11 faces the electrode portions 3b and 4b in the first coil region R1. Viewed from the first direction D1, the inner edge 11b coincides with the inner edge 12b in the first coil region R1. As a result, the distance between the first coil conductor 11 and the electrode portions 3b and 4b is increased. Therefore, the stray capacitance formed between the first coil conductor 11 and the electrode portions 3b and 4b can be reduced. This allows the laminated coil component 1 to further suppress the decrease in self-resonant frequency while improving the Q value and inductance (L).

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

[0063] The cross-sectional area of ​​the first coil conductor 11 may be equal to that of the second coil conductor 12. In this case, the decrease in the Q value is reliably suppressed. Alternatively, the cross-sectional area of ​​the first coil conductor 11 may be equal to that of the second coil conductor 12 and the third coil conductor 13. In this case, the decrease in the Q value is suppressed even more reliably.

[0064] In the above embodiment, a configuration in which the coil 10 has a first coil conductor 11, a second coil conductor 12, and a third coil conductor 13 was described as an example. However, the number of coil conductors constituting the coil 10 is not limited to the values ​​described above. [Explanation of symbols]

[0065] 1,1A...Laminated coil component, 2...Base body, 2a,2b...End face, 2c,2d...Main face, 2e,2f...Side, 3,4...Terminal electrode, 3a,4a...Electrode portion, 3b,4b...Electrode portion, 10...Coil, 10a...End, 11...First coil conductor, 11a...Outer edge, 11b...Inner edge, 12...Second coil conductor, 12a...Outer edge, 12b...Inner edge, 13...Third coil conductor, 13a...Outer edge, 13b...Inner edge, W1,W2,W3...Width, H1 / W1,H2 / W2,H3 / W3...Aspect ratio, AX...Coil axis, R1...First coil region, R2...Second coil region.

Claims

1. an element body having a rectangular parallelepiped shape, the element body having a pair of main surfaces facing each other in a first direction, a pair of end faces facing each other in a second direction intersecting the first direction, and a pair of side surfaces facing each other in a third direction intersecting the first direction and the second direction; a coil having a coil axis along the first direction and disposed within the element body; a terminal electrode electrically connected to the coil, the terminal electrode has a main surface electrode portion provided on one of the main surfaces, the coil has a plurality of coil conductors that are spaced apart from each other in the first direction and are electrically connected to each other; a width of a first coil conductor, which is disposed closest to the one principal surface and faces the principal surface electrode portion, among the plurality of coil conductors, is narrower than a width of a second coil conductor, which is disposed closer to the other principal surface than the first coil conductor; The aspect ratio of the first coil conductor is higher than the aspect ratio of the second coil conductor. Multilayer coil components.

2. The cross-sectional area of ​​the first coil conductor is equal to the cross-sectional area of ​​the second coil conductor. The laminated coil component according to claim 1.

3. The width of the plurality of coil conductors is narrower toward the one main surface side, the aspect ratios of the coil conductors are higher toward the one principal surface side; 3. The laminated coil component according to claim 1.

4. When viewed from the first direction, an outer edge of the first coil conductor coincides with an outer edge of the second coil conductor. The laminated coil component according to claim 1 .

5. the terminal electrode further has an end surface electrode portion provided on the end surface, the first coil conductor faces the end surface electrode portion, When viewed from the first direction, an inner edge of the first coil conductor coincides with an inner edge of the second coil conductor. The laminated coil component according to claim 1 .

6. the coil includes a pair of first coil regions facing each other across the coil axis in the second direction, and a pair of second coil regions facing each other across the coil axis in the third direction, When viewed from the first direction, in the first coil region, an inner edge of the first coil conductor coincides with an inner edge of the second coil conductor, and in the second coil region, an outer edge of the first coil conductor coincides with an outer edge of the second coil conductor. The laminated coil component according to claim 5.

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