inductor component
By designing coil wiring structures with thick and thin walls in the inductor components and making the conducting electrodes inclined or stepped inclined connections, the problem of stress concentration on the conducting electrodes during firing is solved, thereby improving the reliability and electrical performance of the inductor components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- MURATA MFG CO LTD
- Filing Date
- 2022-04-01
- Publication Date
- 2026-05-12
AI Technical Summary
During the firing process of existing inductor components, the axial connection between the conducting electrode and the coil wiring causes significant stress, which can easily lead to the conducting electrode peeling off from the coil wiring.
The first coil wiring and the second coil wiring have thick-walled and thin-walled sections respectively. The conducting electrode is connected to the thin-walled section and is inclined or stepped relative to the axial direction. The connection area between the conducting electrode and the thin-walled section is designed to reduce stress concentration during firing.
It effectively reduces the stress on the conducting electrode during firing, prevents the conducting electrode from peeling off from the coil wiring, reduces the impact of stray capacitance, and improves the reliability and Q value of inductor components.
Smart Images
Figure CN115206650B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to inductor components. Background Technology
[0002] Conventionally, the inductor component described in Japanese Patent Application Publication No. 2019-57581 (Patent Document 1) has been used. This inductor component includes a blank and a coil disposed within the blank and wound into a helical shape along the axial direction. The coil has multiple coil wires wound along a plane orthogonal to the axial direction and conducting electrodes connecting adjacent coil wires. The aspect ratio of the coil wires is 1.0 or higher. The aspect ratio of the coil wires is (thickness along the axial direction of the coil wires) / (width of the coil wires).
[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-57581
[0004] In the inductor component disclosed in Patent Document 1, the conducting electrode is connected to the adjacent coil wiring along the axial direction. If the aspect ratio of the coil wiring is large, the thickness of the axial coil wiring also increases. Here, the coil wiring shrinks during firing. Therefore, in the inductor component of Patent Document 1, where the axial coil wiring is relatively thick, the axial shrinkage of the coil wiring also increases during firing, resulting in greater axial stress on the conducting electrode, raising concerns about the conducting electrode peeling off from the coil wiring. Summary of the Invention
[0005] Therefore, this disclosure is to provide an inductor component that can reduce the stress on the conductive electrodes generated during firing.
[0006] To address the aforementioned issues, one embodiment of the present disclosure provides an inductor component comprising a blank and a coil, wherein the coil is disposed within the blank and wound into a helical shape along the axial direction.
[0007] The coil described above has a first coil wiring, a second coil wiring, and a conductive electrode. The first coil wiring is wound along a plane orthogonal to the axial direction. The second coil wiring is adjacent to the first coil wiring along the axial direction and is also wound along a plane orthogonal to the axial direction. The conductive electrode connects the first coil wiring and the second coil wiring.
[0008] The aforementioned first coil wiring has a first thick-walled portion and a first thin-walled portion, wherein the aspect ratio of the first thick-walled portion exceeds 1.00, and the first thin-walled portion is the end of the aforementioned first coil wiring, with an average thickness less than the thickness of the first thick-walled portion.
[0009] The second coil wiring described above has a second thick-walled portion and a second thin-walled portion, wherein the aspect ratio of the second thick-walled portion exceeds 1.00, and the second thin-walled portion is the end of the second coil wiring, with an average thickness less than the thickness of the second thick-walled portion.
[0010] The aforementioned conductive electrode connects the aforementioned first thin-walled portion and the aforementioned second thin-walled portion.
[0011] Here, the axial direction refers to the direction parallel to the central axis of the helix formed by the winding coil. Furthermore, the aspect ratio is (thickness of the first thick-walled portion) / (width of the first thick-walled portion). The thickness of the first thick-walled portion refers to the axial thickness of the coil in a section orthogonal to the extending direction of the first thick-walled portion. The width of the first thick-walled portion refers to the dimension in a direction orthogonal to the axial direction of the coil in a section orthogonal to the extending direction of the first thick-walled portion. The aspect ratio of the second thick-walled portion is defined similarly.
[0012] Furthermore, the average thickness of the so-called first thin-walled portion is (the cross-sectional area of the first thin-walled portion) / (the wiring length of the first thin-walled portion along its extension direction on the cross-section of the first thin-walled portion). The cross-sectional area of the first thin-walled portion refers to the area on a cross-section parallel to the axial direction of the coil, which, when viewed from the axial direction of the coil, includes the center of the conducting electrode and is parallel to the extension direction of the first thin-walled portion. The average thickness of the second thin-walled portion is defined similarly.
[0013] According to the above embodiment, the conductive electrode is connected to the first thin-walled portion and the second thin-walled portion. Since the average thickness of the first thin-walled portion and the second thin-walled portion is smaller than the thickness of the first thick-walled portion and the second thick-walled portion, respectively, the axial shrinkage during firing is reduced. Therefore, the stress on the conductive electrode generated during firing can be reduced.
[0014] In one preferred embodiment of the inductor component,
[0015] The central axis of the aforementioned conductive electrode is tilted relative to the aforementioned axial direction.
[0016] Here, the so-called central axis of the conducting electrode is the line that guides the conducting electrode to extend from the first thin-walled portion toward the second thin-walled portion and passes through the center of the conducting electrode.
[0017] According to the above embodiment, since the conductive electrode is tilted, the stress generated on the conductive electrode during firing can be dispersed in the tilting direction.
[0018] In one preferred embodiment of the inductor component,
[0019] The central axis of the aforementioned conductive electrode is inclined in a stepped manner relative to the aforementioned axis by alternately repeating portions extending in a direction parallel to the aforementioned axis and portions extending in a direction orthogonal to the aforementioned axis.
[0020] According to the above embodiment, tilted conductive electrodes can be easily manufactured using a photolithography process. Furthermore, by tilting the conductive electrodes relative to the axial direction, the stress generated on the conductive electrodes during firing can be dispersed in the tilting direction.
[0021] In one preferred embodiment of the inductor component,
[0022] The thickness of the first thin-walled portion decreases along the extending direction of the first thin-walled portion and decreases from the end opposite to the end of the first coil wiring toward the end.
[0023] Here, the thickness of the first thin-walled portion refers to the axial thickness of the coil on a cross-section orthogonal to the extension direction of the first thin-walled portion. Furthermore, the reduction in the thickness of the first thin-walled portion refers to a staged or continuous reduction in the thickness of the first thin-walled portion.
[0024] According to the above embodiment, since the thickness of the first thin-walled portion decreases along the above direction, the stress generated at the conductive electrode during firing can be dispersed.
[0025] In one preferred embodiment of the inductor component,
[0026] The thickness of the first thin-walled section decreases continuously.
[0027] According to the above embodiments, the stress generated at the conductive electrode during firing can be dispersed more effectively.
[0028] In one preferred embodiment of the inductor component,
[0029] The thickness of the second thin-walled portion decreases along the extending direction of the second thin-walled portion and decreases from the end opposite to the end of the second coil wiring toward the end.
[0030] Here, the thickness of the second thin-walled portion refers to the axial thickness of the coil on a cross-section orthogonal to the extension direction of the second thin-walled portion. Furthermore, the reduction in the thickness of the second thin-walled portion refers to a staged or continuous reduction in its thickness.
[0031] According to the above embodiment, since the thickness of the second thin-walled portion decreases along the above direction, the stress generated at the conductive electrode during firing can be dispersed.
[0032] In one preferred embodiment of the inductor component,
[0033] The thickness of the second thin-walled portion decreases continuously.
[0034] According to the above embodiments, the stress generated at the conductive electrode during firing can be dispersed more effectively.
[0035] In one preferred embodiment of the inductor component,
[0036] The surface of the aforementioned blank has: a first end face; a second end face opposite to the first end face; a bottom face connecting the first end face and the second end face; and a top face opposite to the bottom face.
[0037] The aforementioned inductor component further includes a first external electrode and a second external electrode, wherein the first external electrode is disposed across the first end face and the bottom surface, and the second external electrode is disposed across the second end face and the bottom surface.
[0038] The aforementioned coil is configured such that its axial direction is parallel to the aforementioned first end face, the aforementioned second end face, the aforementioned bottom surface, and the aforementioned top surface.
[0039] One end of the coil is connected to the first external electrode, and the other end of the coil is connected to the second external electrode.
[0040] The aforementioned conductive electrode is configured such that the distance between it and the aforementioned bottom surface is less than 50% of the distance between the aforementioned bottom surface and the aforementioned top surface.
[0041] According to the above embodiment, since the conducting electrode is configured such that the distance between the bottom surface and the top surface is less than 50%, the first thin-walled portion and the second thin-walled portion, which have relatively small average thicknesses, also exist at a position where the distance between the bottom surface and the top surface is less than 50%. This reduces the impact of stray capacitance between the substrate on which the first external electrode and the second external electrode, the inductor component are mounted, and the conducting electrode. In contrast, when the coil wiring is composed only of a thick-walled portion, the impact of the stray capacitance increases.
[0042] In one preferred embodiment of the inductor component,
[0043] The aspect ratio of at least one of the first thick-walled portion and the second thick-walled portion is 1.08 or more and 2.54 or less.
[0044] According to the above implementation method, the Q value can be improved.
[0045] In one preferred embodiment of the inductor component,
[0046] The aspect ratio of at least one of the first thin-walled portion and the second thin-walled portion is 1.00 or less.
[0047] Here, the aspect ratio of the so-called first thin-walled portion is (average thickness of the first thin-walled portion) / (width of the first thin-walled portion). The width of the first thin-walled portion refers to the dimension in a direction orthogonal to the axial direction of the coil on a cross section orthogonal to the extension direction of the first thin-walled portion. The aspect ratio of the second thin-walled portion is defined similarly.
[0048] According to the above embodiments, the stress generated in the conductive electrode during firing can be reduced more effectively.
[0049] In one preferred embodiment of the inductor component,
[0050] At the end side of the first coil wiring, the first thin-walled portion includes at least a portion corresponding to the entire area overlapping with the end side of the second coil wiring when viewed from the axial direction.
[0051] At the end side of the second coil wiring, the second thin-walled portion includes at least a portion corresponding to the entire area that overlaps with the end side of the first coil wiring when viewed from the axial direction.
[0052] According to the above embodiments, the stress generated in the conductive electrode during firing can be reduced more effectively.
[0053] In one preferred embodiment of the inductor component,
[0054] The first thick-walled portion and the first thin-walled portion are adjacent to each other and integrally formed.
[0055] Here, "forming as one" means that the two components are formed continuously without forming an interface.
[0056] According to the above-described embodiments, the strength of the first coil wiring can be improved.
[0057] In one preferred embodiment of the inductor component,
[0058] The aforementioned second thick-walled portion and the aforementioned second thin-walled portion are adjacent to each other and integrally formed.
[0059] According to the above implementation method, the strength of the second coil wiring can be improved.
[0060] In one preferred embodiment of the inductor component,
[0061] The end faces of the conductive electrodes connected to the first thin-walled portion and the second thin-walled portion are circular in shape, and the diameter of the end faces is 30 μm or more and 50 μm or less.
[0062] According to the above embodiments, since the connection area between the conductive electrode and the thin-walled portion can be ensured, the connection reliability can be improved.
[0063] An inductor component according to one aspect of this disclosure can reduce the stress on the conductive electrodes generated during firing. Attached Figure Description
[0064] Figure 1 This is a perspective view of the first embodiment of the inductor component, viewed from the bottom side.
[0065] Figure 2 This is an exploded view of the inductor component.
[0066] Figure 3 This is a perspective side view of the inductor component viewed from the first side.
[0067] Figure 4 This is a perspective bottom view of the inductor component, viewed from the bottom side.
[0068] Figure 5A yes Figure 3 The A-A section is a cross-sectional view of the thick-walled portion of the coil wiring.
[0069] Figure 5B yes Figure 3 The B-B section is a cross-sectional view of the thin-walled portion of the coil wiring.
[0070] Figure 6 This is a perspective bottom view taken from the bottom side, showing a second embodiment of the inductor component.
[0071] Figure 7 This is a perspective bottom view taken from the bottom side, showing the third embodiment of the inductor component.
[0072] Figure 8 This is a perspective bottom view taken from the bottom side, showing the fourth embodiment of the inductor component.
[0073] Figure 9 This is a perspective bottom view taken from the bottom side, showing the fourth embodiment of the inductor component.
[0074] Explanation of reference numerals in the attached figures
[0075] 1, 1A, 1B, 1C...Inductor components; 10...Bulk blank; 11...Insulating layer; 13...First side surface; 14...Second side surface; 15...First end face; 16...Second end face; 17...Bottom surface; 18...Top surface; 20, 20A...Coil; 21, 21A...First coil wiring; 21a, 21b, 21c...Coil conductor layer; 22, 22A...Second coil wiring; 26, 26A, 26B...Conducting electrodes; 30...First external electrode; 33...First external electrode conductor layer; 40...Second external electrode; 43...Second external electrode conductor layer; 211...First thick-walled portion; 212, 212A...First thin-walled portion; 22 1...Second thick-walled portion; 222, 222A...Second thin-walled portion; A...Cross-sectional area of the first thin-walled portion; L1...Distance between the conducting electrode and the bottom surface; L2...Distance between the bottom surface and the top surface; L3...Wire length of the first thin-walled portion; C1, C2...Central axis of the conducting electrode; C2a...Part extending in a direction parallel to the axial direction within the central axis; C2b...Part extending in a direction orthogonal to the axial direction within the central axis; M1, M2...Midpoint of the central axis; S1, S2...Surface of the first thin-walled portion; S3...End face of the first thick-walled portion; S4...End face of the second thick-walled portion; S5...Inclined surface of the first thin-walled portion; S6...Inclined surface of the second thin-walled portion; t...Thickness of the first thick-walled portion; t rev ...the average thickness of the first thin-walled section; w...the width of the first thick-walled section. Detailed Implementation
[0076] Hereinafter, an inductor component as one embodiment of the present disclosure will be described in detail with reference to the illustrated embodiments. Furthermore, the drawings contain some schematic components and may not reflect actual dimensions or proportions.
[0077] (First Implementation)
[0078] Figure 1 This is a perspective view of the first embodiment of the inductor component, viewed from the bottom side. Figure 2 This is an exploded view of the inductor component. Figure 3 This is a perspective side view of the inductor component as seen from the first side (i.e., the axial direction of the coil). Figure 4 This is a perspective bottom view of the inductor component, viewed from the bottom side.
[0079] like Figures 1-4 As shown, the inductor component 1 has a blank 10, a coil 20 disposed within the blank 10 and wound into a spiral shape along the axial direction, and a first external electrode 30 and a second external electrode 40 disposed in the blank 10 and electrically connected to the coil 20. Figure 1 , Figure 3 as well as Figure 4 In order to make the structure easier to understand, the blank 10 is depicted as transparent, but it can also be semi-transparent or opaque.
[0080] The inductor component 1 is electrically connected to a circuit board (not shown) via wiring through a first external electrode 30 and a second external electrode 40. The inductor component 1 is used, for example, as an impedance matching coil (matching coil) in high-frequency circuits for electronic devices such as personal computers, DVD players, digital cameras, TVs, mobile phones, automotive electronics, and medical / industrial machinery. However, the application of the inductor component 1 is not limited to this; for example, it can also be used in tuning circuits, filtering circuits, rectifier smoothing circuits, etc.
[0081] The blank 10 is formed in a generally rectangular parallelepiped shape. The surface of the blank 10 includes a first end face 15 and a second end face 16 opposite each other, a first side face 13 and a second side face 14 opposite each other, a bottom surface 17 connecting the first end face 15 and the second end face 16 and the first side face 13 and the second side face 14, and a top surface 18 opposite the bottom surface 17. Furthermore, as shown in the figure, the X direction is orthogonal to the first end face 15 and the second end face 16, the Y direction is orthogonal to the first side face 13 and the second side face 14, and the Z direction is orthogonal to the bottom surface 17 and the top surface 18, and is also orthogonal to both the X and Y directions.
[0082] The blank 10 is constructed by stacking multiple insulating layers 11. The insulating layers 11 are made of materials such as borosilicate glass as the main component, ferrite, or resin. The stacking direction of the insulating layers 11 is parallel (Y direction) to the first end face 15, the second end face 16, and the bottom face 17 of the blank 10. That is, the insulating layers 11 are layered and extend along the XZ plane. The term "parallel" in this application is not limited to a strict parallel relationship; it also includes a substantial parallel relationship, taking into account the range of actual deviations. Furthermore, there are cases where the interfaces between the multiple insulating layers 11 become unclear due to firing or other processes.
[0083] The first external electrode 30 and the second external electrode 40 are made of conductive materials such as Ag, Cu, Au, or alloys with these materials as the main components. The first external electrode 30 is L-shaped, extending from the first end face 15 to the bottom face 17. The first external electrode 30 is embedded in the blank 10 so that it is exposed from the first end face 15 and the bottom face 17. The second external electrode 40 is L-shaped, extending from the second end face 16 to the bottom face 17. The second external electrode 40 is embedded in the blank 10 so that it is exposed from the second end face 16 and the bottom face 17.
[0084] The first external electrode 30 and the second external electrode 40 have a structure consisting of multiple stacked first external electrode conductor layers 33 and second external electrode conductor layers 43 embedded in the blank body 10 (insulating layer 11). The first external electrode conductor layer 33 extends along the first end face 15 and the bottom surface 17, and the second external electrode conductor layer 43 extends along the second end face 16 and the bottom surface 17. According to the above structure, the first external electrode 30 is provided across the first end face 15 and the bottom surface 17. In addition, the second external electrode 40 is provided across the second end face 16 and the bottom surface 17. According to the above structure, since the external electrodes 30 and 40 can be embedded in the blank body 10, the inductor component can be miniaturized compared to the structure in which the external electrodes are mounted outside the blank body 10. In addition, the coil 20 and the external electrodes 30 and 40 can be formed in the same process, reducing the deviation in the positional relationship between the coil 20 and the external electrodes 30 and 40, thereby reducing the deviation in the electrical characteristics of the inductor component 1.
[0085] The coil 20 is made of, for example, the same conductive material as the first external electrode 30 and the second external electrode 40. The coil 20 is wound into a spiral shape along the stacking direction (Y direction) of the insulating layer 11. The coil 20 is configured such that its axial direction is parallel to the first end face 15, the second end face 16, the bottom surface 17, and the top surface 18. The axial direction of the coil 20 refers to the direction parallel to the central axis of the spiral in which the coil 20 is wound. One end of the coil 20 is connected to the first external electrode 30, and the other end is connected to the second external electrode 40. Furthermore, in this embodiment, the coil 20 is integrated with the first external electrode 30 and the second external electrode 40 without a defined boundary, but this is not a limitation; boundaries can exist by forming the coil and external electrodes with different types of materials and methods.
[0086] The coil 20 has a first coil wiring 21 wound along a plane orthogonal to the axial direction, a second coil wiring 22 wound axially adjacent to the first coil wiring 21 and along a plane orthogonal to the axial direction, and a conductive electrode 26 connecting the first coil wiring 21 and the second coil wiring 22. The first coil wiring 21 and the second coil wiring 22 are connected via the conductive electrode 26 to form a spiral. One end of the first coil wiring 21 (the end opposite to the side connected to the conductive electrode 26) is connected to a second external electrode 40. One end of the second coil wiring 22 (the end opposite to the side connected to the conductive electrode 26) is connected to a first external electrode 30.
[0087] The first coil wiring 21 is formed by winding on the main surface (XZ plane) of the insulating layer 11, which is orthogonal to the axial direction. The first coil wiring 21 may have less than one turn, but it can also have more than one turn. Figure 1As shown by the imaginary lines, the first coil wiring 21 includes three coil conductor layers 21a, 21b, and 21c that are in surface contact with each other and stacked axially. This improves the aspect ratio of the first coil wiring 21. Each coil conductor layer 21a, 21b, and 21c is wound along a plane orthogonal to the axial direction. Furthermore, in this embodiment, the coil conductor layers 21a, 21b, and 21c are integrated without defined boundaries, but this is not a limitation; boundaries can exist by forming each coil conductor layer with different materials and methods. Additionally, the first coil wiring 21 may consist of a single coil conductor layer, or it may consist of two or more coil conductor layers.
[0088] The first coil wiring 21 has a first thick-walled portion 211 and a first thin-walled portion 212. The aspect ratio of the first thick-walled portion 211 exceeds 1.00, and the first thin-walled portion 212 is the end of the first coil wiring 21 and has an average thickness less than the thickness of the first thick-walled portion 211.
[0089] The first thick-walled portion 211 is the portion of the first coil wiring 21 with an aspect ratio exceeding 1.00. Specifically, in this embodiment, as... Figure 1 As shown, the portions of coil conductor layers 21a, 21b, and 21c, excluding the portion that forms the first thin-walled portion 212, are stacked axially to form a first thick-walled portion 211. The aspect ratio of the first thick-walled portion 211 is (thickness of the first thick-walled portion 211) / (width of the first thick-walled portion 211).
[0090] Figure 5A yes Figure 3 The A-A section is a cross-sectional view of the first thick-walled portion of the first coil wiring. For example... Figure 5A As shown, the aforementioned "thickness of the first thick-walled portion 211" refers to the axial (Y-direction) dimension t of the coil on a cross-section orthogonal to the extending direction of the first thick-walled portion 211. The aforementioned "width of the first thick-walled portion 211" refers to the dimension w in a direction orthogonal to the axial direction of the coil on a cross-section orthogonal to the extending direction of the first thick-walled portion 211. Viewed from the axial direction of the coil 20, the first thick-walled portion 211 is formed as approximately circular, but is not limited to this shape. The shape of the first thick-walled portion 211 may also be, for example, elliptical, rectangular, or other polygonal shapes.
[0091] exist Figure 5AIn the original text, the first thick-walled portion 211 has a rectangular cross-section, but there are cases where the actual first thick-walled portion 211 is not rectangular. Even in this case, the aspect ratio of the first thick-walled portion 211 can be calculated based on its cross-sectional area and its maximum axial thickness. Specifically, the thickness t is set as the maximum axial thickness of the first thick-walled portion 211, and the width w is set as the value obtained by dividing the cross-sectional area of the first thick-walled portion 211 by its maximum thickness. Thus, even if the inner and outer surfaces of the first thick-walled portion 211 have irregularities, the aspect ratio can be easily determined. Therefore, the cross-sectional shape of the first thick-walled portion 211 is not limited to a rectangle, but also includes ellipses, polygons, and shapes with irregularities. The same applies to the cross-sections orthogonal to the extension direction of each of the second thick-walled portion 221, the first thin-walled portion 212, and the second thin-walled portion 222, which will be described later.
[0092] The first thin-walled portion 212 is the portion in the first coil wiring 21 whose average thickness is less than the thickness of the first thick-walled portion 211. For example... Figures 1-4 As shown, viewed axially, the first thin-walled portion 212 is continuous with the first thick-walled portion 211 and extends along the extending direction of the first thick-walled portion 211. In this embodiment, the first thin-walled portion 212 is formed by the portion of the coil conductor layer 21c occupying the end of the first coil wiring 21 (the end opposite to the side connected to the second external electrode 40). The so-called average thickness (t) of the first thin-walled portion 212 is... ave () is (the cross-sectional area of the first thin-walled portion 212) / (the wiring length of the first thin-walled portion 212 along the extension direction of the first thin-walled portion 212 on the cross-section of the first thin-walled portion 212).
[0093] Figure 5B yes Figure 3 The B-B section is a cross-sectional view of the first thin-walled portion of the first coil wiring. For example... Figure 5B As shown, the aforementioned "cross-sectional area of the first thin-walled portion 212" refers to the area A of a cross-section parallel to the axial direction (Y direction) of the coil, which, when viewed from the axial direction of the coil, includes the center of the conducting electrode and is parallel to the extending direction of the first thin-walled portion 212. The aforementioned "wiring length of the first thin-walled portion 212 along its extending direction on the cross-section of the first thin-walled portion 212" refers to... Figure 5B The transverse width L3 of the cross section shown.
[0094] like Figures 1-4 As shown, in this embodiment, viewed axially, the first thin-walled portion 212 extends continuously from the first thick-walled portion 211, and its front end is formed into an arc shape. However, the shape of the first thin-walled portion 212 is not limited to this; viewed axially, it can also be circular, rectangular, or other shapes. Furthermore, as... Figure 4 As shown, viewed from the bottom side of the inductor component 1, the first thin-walled portion 212 is quadrilateral in shape. Furthermore, the first thick-walled portion 211 and the first thin-walled portion 212 are adjacent and integrally formed. "Integrally formed" means that the two components are formed continuously without an interface. This improves the strength of the first coil wiring 21. Alternatively, the first thick-walled portion 211 and the first thin-walled portion 212 can also be formed independently.
[0095] The second coil wiring 22 has the same structure as the first coil wiring 21. That is, the second coil wiring 22 has a second thick-walled portion 221 and a second thin-walled portion 222. The aspect ratio of the second thick-walled portion 221 exceeds 1.00, and the second thin-walled portion 222 is the end of the second coil wiring 22, with an average thickness less than that of the second thick-walled portion 221. Furthermore, the second thick-walled portion 221 and the second thin-walled portion 222 are formed adjacent to each other and integrally. This improves the strength of the second coil wiring 22. Alternatively, the second thick-walled portion 221 and the second thin-walled portion 222 can be formed independently. Since the structures of the second thick-walled portion 221 and the second thin-walled portion 222 are the same as those of the first thick-walled portion 211 and the first thin-walled portion 212, detailed descriptions are omitted.
[0096] like Figure 4 As shown, one axial end of the conductive electrode 26 is connected to the surface S1 on the second side 14 side of the first thin-walled portion 212, and the other axial end is connected to the surface S2 on the first side 13 side of the second thin-walled portion 222. Thus, the conductive electrode 26 connects the first thin-walled portion 212 and the second thin-walled portion 222. In this embodiment, the conductive electrode 26 is cylindrical. However, the shape of the conductive electrode 26 is not limited to this; for example, it can be other shapes such as a cylinder with an elliptical cross-section or a cylinder with a polygonal cross-section.
[0097] According to the above embodiment, the first coil wiring 21 has a first thick-walled portion 211 and a first thin-walled portion 212, and the second coil wiring 22 has a second thick-walled portion 221 and a second thin-walled portion 222. A conductive electrode 26 is connected to each of the thin-walled portions 212 and 222. The average axial thickness of the first thin-walled portion 212 is less than the axial thickness of the first thick-walled portion 211, and the average axial thickness of the second thin-walled portion 222 is less than the axial thickness of the second thick-walled portion 221. Therefore, the axial shrinkage of the first thin-walled portion 212 and the second thin-walled portion 222 during firing is less than that of the first thick-walled portion 211 and the second thick-walled portion 221, which reduces the stress on the conductive electrode generated during firing. Therefore, it is possible to suppress the conductive electrode 26 from peeling off from the first coil wiring 21 and the second coil wiring 22 during firing.
[0098] like Figure 3As shown, the preferred conductive electrode 26 is configured such that the distance L1 between it and the bottom surface 17 is less than 50% of the distance L2 between the bottom surface 17 and the top surface 18. The distance L1 refers to the distance between the center of the conductive electrode 26 and the bottom surface 17 when viewed from the axial direction.
[0099] According to the above structure, since the conducting electrode 26 is positioned at less than 50% of the distance between the bottom surface 17 and the top surface 18, the first thin-walled portion 212 and the second thin-walled portion 222, which have relatively small average thicknesses, also exist at positions less than 50% of the distance between the bottom surface 17 and the top surface 18. That is, in this case, the conducting electrode 26 and the first thin-walled portion 212 and the second thin-walled portion 222 connected to the conducting electrode 26 are relatively close to the substrate (not shown) mounted on the bottom surface 17 side of the inductor component 1, making it easy to generate stray capacitance with the substrate. However, since the first thin-walled portion 212 and the second thin-walled portion 222, which have a thickness smaller than the first thick-walled portion 211 and the second thick-walled portion 221, have a smaller opposing area with the substrate, the influence of the stray capacitance can be reduced. In contrast, when the first coil wiring 21 and the second coil wiring are respectively composed only of the first thick-walled portion 211 and the second thick-walled portion 221, the influence of the stray capacitance is greater.
[0100] Preferably, at least one of the first thick-walled portion 211 and the second thick-walled portion 221 has an aspect ratio of 1.08 or more and 2.54 or less.
[0101] Based on the above structure, the Q value can be improved.
[0102] Preferably, the aspect ratio of at least one of the first thin-walled portion 212 and the second thin-walled portion 222 is 1.00 or less. The aspect ratio of the first thin-walled portion 212 is (average thickness of the first thin-walled portion 212) / (width of the first thin-walled portion 212). The width of the first thin-walled portion 212 refers to the dimension in a direction orthogonal to the axial direction on a cross section orthogonal to the extending direction of the first thin-walled portion 212. Furthermore, as described above, in this embodiment, when viewed axially, the leading edge of the first thin-walled portion 212 in the extending direction is arc-shaped. Therefore, the width of the first thin-walled portion 212 is not constant in the extending direction. In this case, the aforementioned "cross section orthogonal to the extending direction of the first thin-walled portion 212" can be a cross section orthogonal to the extending direction of the first thin-walled portion 212 in the portion connected to the first thick-walled portion 211. The aspect ratio of the second thin-walled portion 222 is defined similarly.
[0103] Based on the above structure, the stress generated in the conductive electrode 26 during firing can be reduced more effectively.
[0104] Preferably, on the end side of the first coil wiring 21, the first thin-walled portion 212 includes at least a portion corresponding to the entire area overlapping with the end side of the second coil wiring 22 when viewed from the axial direction, and on the end side of the second coil wiring 22, the second thin-walled portion 222 includes at least a portion corresponding to the entire area overlapping with the end side of the first coil wiring 21 when viewed from the axial direction. (Refer to...) Figure 3 Specifically, the first thin-walled portion 212 includes a region overlapping with the end side of the second coil wiring 22 on the end side of the first coil wiring 21, i.e., the entire region of the marking diagonal line. Similarly, the second thin-walled portion 222 includes a region overlapping with the end side of the first coil wiring 21 on the end side of the second coil wiring 22, i.e., the entire region of the marking diagonal line. Furthermore, in... Figure 3 The text is marked with slashes for clarity.
[0105] Based on the above structure, the stress generated in the conductive electrode 26 during firing can be reduced more effectively.
[0106] Preferably, the end faces of the conductive electrode 26 that are connected to the first thin-walled portion 212 and the second thin-walled portion 222 are circular in shape, and the diameter of the end faces is more than 30 μm and less than 50 μm.
[0107] According to the above structure, since the connection area between the conductive electrode 26 and the first thin-walled portion 212 and the second thin-walled portion 222 can be ensured, the connection reliability can be improved.
[0108] Preferably, the thickness of the first thick-walled portion 211 is more than twice and less than five times the average thickness of the first thin-walled portion 212, and the thickness of the second thick-walled portion 221 is more than twice and less than five times the average thickness of the second thin-walled portion 222.
[0109] According to the above structure, the stress on the conductive electrode 26 generated during firing can be further reduced, and the resistivity reduction of the first coil wiring and the second coil wiring can be suppressed.
[0110] (Second Implementation)
[0111] Figure 6 This is a perspective bottom view taken from the bottom side, showing a second embodiment of the inductor component. The shape of the conducting electrode in the second embodiment differs from that in the first embodiment. This difference in structure will be described below. Other structures are the same as those in the first embodiment, and are denoted by the same reference numerals as in the first embodiment, so their descriptions are omitted.
[0112] like Figure 6As shown, viewed from a direction orthogonal to the axial direction (Y direction) and passing through the midpoint M1 of the central axis C1 of the conducting electrode 26A, the central axis C1 of the conducting electrode 26A in the second embodiment is inclined relative to the axial direction. The central axis C1 of the conducting electrode 26A is defined as the line that guides the conducting electrode 26A in the direction extending from the first thin-walled portion 212 toward the second thin-walled portion 222 and passes through the center of the conducting electrode 26A. In contrast, viewed from a direction orthogonal to the axial direction and passing through the midpoint of the central axis of the conducting electrode 26A, the central axis of the conducting electrode 26A in the first embodiment is parallel to the axial direction. Furthermore, in this embodiment, in the conducting electrode 26A, when viewed from a direction orthogonal to the axial direction and passing through the midpoint M1 of the central axis C1 of the conducting electrode 26A, the central axis C1 is inclined relative to the axial direction. However, as long as the central axis C1 is inclined relative to the axial direction, the direction of inclination of the central axis C1 is not particularly limited; it can be inclined relative to the axial direction from any direction of view.
[0113] According to the above embodiment, since the conducting electrode 26A is tilted, the stress generated on the conducting electrode 26A during firing can be dispersed in the tilting direction. Furthermore, since the conducting electrode 26A is tilted, the connection area between the conducting electrode 26A and the first thin-walled portion 212 and the second thin-walled portion 222 can be increased. Therefore, it is possible to suppress the conducting electrode 26A from peeling off from the first coil wiring 21 and the second coil wiring 22 during firing.
[0114] (Third Implementation)
[0115] Figure 7 This is a perspective bottom view taken from the bottom side, showing a third embodiment of the inductor component. The shape of the conducting electrode in the third embodiment differs from that in the first embodiment. This difference in structure will be described below. Other structures are the same as in the first embodiment, and are denoted by the same reference numerals as in the first embodiment, so their descriptions are omitted.
[0116] like Figure 7 As shown, viewed from the direction orthogonal to the axial direction (Y direction) and passing through the midpoint M2 of the central axis C2 of the conducting electrode 26B in the third embodiment, the central axis C2 of the conducting electrode 26B is inclined in a stepped manner relative to the axial direction by alternately repeating the portion C2a extending in a direction parallel to the axial direction and the portion C2b extending in a direction orthogonal to the axial direction. Furthermore, in this embodiment, in the conducting electrode 26B, when viewed from the direction orthogonal to the axial direction and passing through the midpoint M2 of the central axis C2 of the conducting electrode 26B, the central axis C2 is inclined in a stepped manner relative to the axial direction. However, as long as the central axis C2 is inclined in a stepped manner relative to the axial direction, the direction of inclination of the central axis C2 is not particularly limited; it is acceptable for the central axis C2 to be inclined in a stepped manner relative to the axial direction when viewed from any direction.
[0117] According to the above embodiment, the tilted conductive electrode can be easily manufactured using a photolithography process. Furthermore, by extending the conductive electrode 26B in a tilted manner relative to the axial direction, the stress generated in the conductive electrode 26B during firing can be dispersed in the tilted direction. This prevents the conductive electrode 26B from peeling off from the first coil wiring 21 and the second coil wiring 22 during firing.
[0118] (Fourth Implementation)
[0119] Figure 8 and Figure 9 This is a perspective bottom view taken from the bottom side of a fourth embodiment of the inductor component. The shapes of the first thin-walled portion and the second thin-walled portion in the fourth embodiment differ from those in the second embodiment. This difference in structure will be described below. Other structures are the same as those in the second embodiment, and are denoted by the same reference numerals as in the second embodiment, so their descriptions are omitted.
[0120] like Figure 8 As shown, in the inductor component 1C of the fourth embodiment, the thickness of the first thin-walled portion 212A decreases along a direction from the end of the first coil wiring 21A connected to the second external electrode 40 toward the end connected to the conducting electrode 26A, which is the extension direction of the first coil wiring 21A. The aforementioned "thickness of the first thin-walled portion 212A" refers to the axial thickness of the coil on a cross-section orthogonal to the extension direction of the first thin-walled portion 212A. In this embodiment, the thickness of the first thin-walled portion 212A decreases continuously. That is, the surface of the first thin-walled portion 212A located axially opposite to the surface connected to the conducting electrode 26A has an inclined surface S5. In other words, viewed from the bottom surface of the inductor component 1C, the shape of the first thin-walled portion 212A is triangular.
[0121] Furthermore, a portion of the end face S3 in the extending direction of the first thin-walled portion 212A is connected to the first thick-walled portion 211. As a result, the thickness of the first thin-walled portion 212A is further reduced, which can further reduce the shrinkage of the first thin-walled portion 212A during firing.
[0122] In addition, such as Figure 8As shown, in the inductor component 1C of the fourth embodiment, the thickness of the second thin-walled portion 222A decreases along a direction from the end of the second coil wiring 22A connected to the first external electrode 30 toward the end connected to the conducting electrode 26A, which is the extension direction of the second coil wiring 22A. The aforementioned "thickness of the second thin-walled portion 222A" refers to the axial thickness of the coil on a cross-section orthogonal to the extension direction of the second thin-walled portion 222A. In this embodiment, the thickness of the second thin-walled portion 222A decreases continuously. That is, the second thin-walled portion 222A has an inclined surface S6 on the surface opposite to the surface connected to the conducting electrode 26A in the axial direction. In other words, viewed from the bottom surface of the inductor component 1C, the shape of the second thin-walled portion 222A is triangular.
[0123] Furthermore, a portion of the end face S4 in the extending direction of the second thin-walled portion 222A is connected to the second thick-walled portion 221. As a result, the thickness of the second thin-walled portion 222A is further reduced, which can further reduce the shrinkage of the second thin-walled portion 222A during firing.
[0124] According to the above embodiment, since the thickness of the first thin-walled portion 212A decreases along the extending direction of the first coil wiring 21A and from the end of the first coil wiring 21A connected to the second external electrode 40 toward the end connected to the conducting electrode 26A, the stress generated in the conducting electrode 26A during firing can be dispersed. In particular, by continuously reducing the thickness of the first thin-walled portion 212A, the stress generated in the conducting electrode 26A during firing can be dispersed more effectively. Furthermore, since the thickness of the second thin-walled portion 222A decreases along the extending direction of the second coil wiring 22A and from the end of the second coil wiring 22A connected to the first external electrode 30 toward the end connected to the conducting electrode 26A, the stress generated in the conducting electrode 26A during firing can be dispersed. In particular, by continuously reducing the thickness of the second thin-walled portion 222A, the stress generated in the conducting electrode 26A during firing can be dispersed more effectively.
[0125] In addition, such as Figure 9 As shown, the first thin-walled portion 212A can also be connected to the entire surface of the end face S3 in the extending direction of the first thick-walled portion 211. Therefore, during firing, the stress difference between the first thick-walled portion 211 and the first thin-walled portion 212A is reduced, suppressing damage such as cracking between them. Similarly, the second thin-walled portion 222A can also be connected to the entire surface of the end face S4 in the extending direction of the second thick-walled portion 221. Therefore, during firing, the stress difference between the second thick-walled portion 221 and the second thin-walled portion 222A is reduced, suppressing damage such as cracking between them. Furthermore, as... Figure 9As shown by the imaginary curve (double-dotted line), in the printing and lamination process, a portion of the first thin-walled portion 212A and a portion of the second thin-walled portion 222A may overlap a portion of the first thick-walled portion 211 and a portion of the second thick-walled portion 221, respectively.
[0126] Furthermore, this disclosure is not limited to the embodiments described above, and design changes are possible without departing from the spirit of this disclosure. For example, various combinations of feature points from each of the first to fourth embodiments are also possible.
[0127] In the above embodiments, the axis of the coil is orthogonal to the side of the blank, but it can also be orthogonal to the end face of the blank, or it can also be orthogonal to the bottom face of the blank.
[0128] In the above embodiment, the coil has two coil wirings: a first coil wiring and a second coil wiring. However, the number of coil wirings is not limited to this and can be three or more.
[0129] In the above embodiments, the first external electrode and the second external electrode are L-shaped, but they can also be five-sided electrodes, for example. That is, the first external electrode can be disposed on the entire surface of the first end face and a portion of each of the first side face, the second side face, the bottom face, and the top face, and the second external electrode can be disposed on the entire surface of the second end face and a portion of each of the first side face, the second side face, the bottom face, and the top face. Alternatively, the first external electrode and the second external electrode can each be disposed on a portion of the bottom face.
[0130] In the above embodiments, on the end side of the first coil wiring, the first thin-walled portion includes at least a portion corresponding to the entire area overlapping with the end side of the second coil wiring when viewed axially, and on the end side of the second coil wiring, the second thin-walled portion includes at least a portion corresponding to the entire area overlapping with the end side of the first coil wiring when viewed axially. However, the first thin-walled portion may also include a portion of the area overlapping with the end side of the second coil wiring when viewed axially on the end side of the first coil wiring. Additionally, the second thin-walled portion may also include a portion of the area overlapping with the end side of the first coil wiring when viewed axially on the end side of the second coil wiring. Alternatively, the first thin-walled portion of the first coil wiring may not overlap with the second thin-walled portion of the second coil wiring when viewed axially.
[0131] In the above embodiment, the conductive electrodes connected to the first thin-walled portion and the second thin-walled portion are configured such that the distance between the bottom surface and the top surface is less than 50%. However, when there are other conductive electrodes not connected to the first thin-walled portion and the second thin-walled portion, these other conductive electrodes may also be configured such that the distance between the bottom surface and the top surface exceeds 50%. Furthermore, the conductive electrodes connected to the first thin-walled portion and the second thin-walled portion may also be configured such that the distance between the bottom surface and the top surface exceeds 50%. This increases design flexibility.
[0132] In the fourth embodiment described above, the thicknesses of the first thin-walled portion 212A and the second thin-walled portion 222A decrease continuously, but they can also be reduced in stages. Alternatively, the thickness of only either the first thin-walled portion 212A or the second thin-walled portion 222A may be reduced.
[0133] (Example)
[0134] Hereinafter, an embodiment of the manufacturing method of inductor component 1 will be described.
[0135] First, an insulating paste, primarily composed of borosilicate glass, is repeatedly screen-printed onto a substrate material such as a carrier film to form an insulating layer. This insulating layer becomes an outer insulating layer located outside the coil conductor layer. Furthermore, the substrate material is peeled off from the insulating layer through any process, leaving no residue in the inductor component.
[0136] Next, a photosensitive conductive paste layer is coated onto the insulating layer, and a coil conductor layer and an external electrode conductor layer are formed through a photolithography process. Specifically, a photosensitive conductive paste layer with Ag as the main metal component is formed by screen printing onto the insulating layer. Further, the photosensitive conductive paste layer is irradiated with ultraviolet light or the like through a photomask and developed using an alkaline solution or the like. This forms the coil conductor layer and the external electrode conductor layer on the insulating layer. At this point, the coil conductor layer and the external electrode conductor layer can be patterned into the desired pattern using a photomask.
[0137] Then, a photosensitive insulating paste layer is coated onto the insulating layer, and an insulating layer with openings and vias is formed by photolithography. Specifically, a photosensitive insulating paste layer is formed by screen printing onto the insulating layer. Further, the photosensitive insulating paste layer is irradiated with ultraviolet light or the like through a photomask and developed with an alkaline solution or the like. At this time, the photosensitive insulating paste layer is patterned using a photomask so that an opening is formed above the outer electrode conductor layer and a via is formed at the end of the coil conductor layer. Furthermore, when forming... Figure 6 , Figure 8 as well as Figure 9 When the inclined conductive electrode 26A is shown, a conductive hole can be formed, for example, by laser processing or drilling.
[0138] Subsequently, a photosensitive conductive paste layer is coated onto the insulating layer having openings and vias, and a coil conductor layer and an external electrode conductor layer are formed through a photolithography process. Specifically, a photosensitive conductive paste with Ag as the main metal component is screen-printed onto the insulating layer to fill the openings and vias, thereby forming a photosensitive conductive paste layer. Further, the photosensitive conductive paste layer is irradiated with ultraviolet light or the like through a photomask and developed using an alkaline solution or the like. This forms an external electrode conductor layer connected to the lower layer via openings and a coil conductor layer connected to the lower layer via vias on the insulating layer. Furthermore, when forming... Figure 7 When the stepped conductive electrode 26B is shown, the process of repeatedly forming an insulating layer with a conductive hole while offsetting the position of the conductive hole in a direction orthogonal to the axial direction of the coil, and the process of connecting the coil conductor layer to the coil conductor layer on the lower side via the conductive hole, can be performed.
[0139] A coil and an external electrode are formed by repeatedly performing the aforementioned steps of forming an insulating layer, a coil conductor layer, and an external electrode conductor layer. The coil includes a coil conductor layer formed on multiple insulating layers, and the external electrode includes an external electrode conductor layer formed on multiple insulating layers. Furthermore, an insulating layer is formed by repeatedly applying an insulating paste through screen printing onto the insulating layer where the coil and external electrode are formed. This insulating layer is an outer insulating layer located outside the coil conductor layer. Additionally, if the coil and external electrode are arranged in a matrix on the insulating layer in the above steps, a master layer laminate can be obtained.
[0140] Next, the master laminate is cut into multiple unburned laminates by slicing or other methods. During the cutting process of the master laminate, the external electrodes are exposed from the master laminate by the cut surface formed by the cutting. At this time, if a certain amount of cutting deviation occurs, the outer periphery of the coil conductor layer formed in the above process will appear on the end face or bottom face.
[0141] Then, the unfired laminate is fired under specified conditions to obtain a blank containing the coil and external electrodes. The blank is then tumbled to grind it to the appropriate dimensions, and a Ni plating layer with a thickness of 2μm to 10μm and a Sn plating layer with a thickness of 2μm to 10μm are applied to the portions of the external electrodes exposed from the laminate. Through these processes, an inductor component measuring 0.4mm × 0.2mm × 0.2mm is completed.
[0142] Furthermore, the method for forming the conductor pattern is not limited to the above. For example, it can be a method of printing and laminating conductor paste using a screen printing plate with openings shaped like the conductor pattern; it can be a method of forming a pattern on a conductor film formed by sputtering, vapor deposition, foil lamination, etc., by etching; or it can be a method of forming a negative pattern as in a semi-additive process and then removing unwanted parts after forming the conductor pattern by plating. Furthermore, by forming multi-level conductor patterns, high cross-sectional area can be achieved, thereby reducing losses caused by resistance at high frequencies. More specifically, it can be a process of repeatedly forming the above-mentioned conductor pattern; it can be a process of repeatedly overlapping wiring formed by a semi-additive process; it can be a process of forming a layer by a semi-additive process; it can also be a process of forming a plating-grown film by etching; or it can be a process of further growing wiring formed by a semi-additive process by plating to achieve high cross-sectional area.
[0143] Furthermore, the conductor material is not limited to the Ag paste described above; any good conductor such as Ag, Cu, or Au formed through sputtering, vapor deposition, foil lamination, or plating is acceptable. Additionally, the methods for forming the insulating layer and the openings / through holes are not limited to those described above; methods such as laser processing or drilling can also be used to create openings after laminating, spin-coating, or spraying the insulating material sheet.
[0144] In addition, the insulating material is not limited to glass or ceramic materials as described above. It can also be organic materials such as epoxy resin, fluororesin, and polymer resin, or composite materials such as glass epoxy resin. However, materials with low dielectric constant and low dielectric loss are preferred.
[0145] Furthermore, the dimensions of the inductor components are not limited to those described above. Additionally, the method for forming the external electrode is not limited to plating the exposed external conductor after cutting; it can also be a method where, after cutting, the external electrode is further formed by impregnation with conductor paste, sputtering, or the like, and then plating is performed on the external electrode.
Claims
1. An inductor component comprising: a blank and a coil, wherein the coil is disposed within the blank and wound into a helical shape along an axial direction. The aforementioned coil has a first coil wiring, a second coil wiring, and a conducting electrode, wherein, The first coil wiring is wound along a plane orthogonal to the axial direction. The second coil wiring is adjacent to the first coil wiring along the axial direction and is also wound along a plane orthogonal to the axial direction. The conductive electrode connects the first coil wiring and the second coil wiring. The first coil wiring described above has a first thick-walled portion and a first thin-walled portion, wherein the aspect ratio of the first thick-walled portion exceeds 1.00, and the first thin-walled portion is the end of the first coil wiring, and its average thickness is less than the thickness of the first thick-walled portion. The second coil wiring described above has a second thick-walled portion and a second thin-walled portion, wherein the aspect ratio of the second thick-walled portion exceeds 1.00, and the second thin-walled portion is the end of the second coil wiring, and its average thickness is less than the thickness of the second thick-walled portion. The aforementioned conductive electrode connects the first thin-walled portion and the second thin-walled portion in a manner where the central axis is inclined relative to the aforementioned axial direction. The thickness of the portion of the first thin-walled portion that contacts the conductive electrode decreases along the extension direction of the first coil wiring and from the end opposite to the end of the first coil wiring toward the end.
2. The inductor component according to claim 1, wherein, The thickness of the portion of the first thin-walled section that contacts the conductive electrode decreases continuously.
3. An inductor component comprising: a blank and a coil, wherein the coil is disposed within the blank and wound into a helical shape along the axial direction. The aforementioned coil has a first coil wiring, a second coil wiring, and a conducting electrode, wherein, The first coil wiring is wound along a plane orthogonal to the axial direction. The second coil wiring is adjacent to the first coil wiring along the axial direction and is also wound along a plane orthogonal to the axial direction. The conductive electrode connects the first coil wiring and the second coil wiring. The first coil wiring described above has a first thick-walled portion and a first thin-walled portion, wherein the aspect ratio of the first thick-walled portion exceeds 1.00, and the first thin-walled portion is the end of the first coil wiring, and its average thickness is less than the thickness of the first thick-walled portion. The second coil wiring described above has a second thick-walled portion and a second thin-walled portion, wherein the aspect ratio of the second thick-walled portion exceeds 1.00, and the second thin-walled portion is the end of the second coil wiring, and its average thickness is less than the thickness of the second thick-walled portion. The aforementioned conductive electrode connects the aforementioned first thin-walled portion and the aforementioned second thin-walled portion. The thickness of the first thin-walled portion decreases continuously along the extension direction of the first coil wiring and from the end opposite to the end of the first coil wiring toward the end.
4. The inductor component according to claim 3, wherein, The central axis of the aforementioned conductive electrode is tilted relative to the aforementioned axial direction.
5. The inductor component according to any one of claims 1 to 4, wherein, The central axis of the aforementioned conductive electrode is inclined in a step-like manner relative to the aforementioned axial direction by alternately repeating portions extending in a direction parallel to the aforementioned axial direction and portions extending in a direction orthogonal to the aforementioned axial direction.
6. The inductor component according to any one of claims 1 to 4, wherein, The thickness of the second thin-walled portion decreases along the extension direction of the second coil wiring and from the end opposite to the end of the second coil wiring toward the end.
7. The inductor component according to claim 6, wherein, The thickness of the second thin-walled portion decreases continuously.
8. The inductor component according to any one of claims 1 to 4, wherein, The surface of the aforementioned blank has: a first end face; a second end face opposite to the first end face; a bottom face connecting the first end face and the second end face; and a top face opposite to the bottom face. It also includes: a first external electrode disposed on the first end face and the bottom surface; and a second external electrode disposed on the second end face and the bottom surface. The aforementioned coil is configured such that its axial direction is parallel to the aforementioned first end face, the aforementioned second end face, the aforementioned bottom surface, and the aforementioned top surface. One end of the coil is connected to the first external electrode, and the other end of the coil is connected to the second external electrode. The aforementioned conductive electrode is configured such that the distance between it and the aforementioned bottom surface is less than 50% of the distance between the aforementioned bottom surface and the aforementioned top surface.
9. The inductor component according to any one of claims 1 to 4, wherein, The aspect ratio of at least one of the first thick-walled portion and the second thick-walled portion is 1.08 or more and 2.54 or less.
10. The inductor component according to any one of claims 1 to 4, wherein, The aspect ratio of at least one of the first thin-walled portion and the second thin-walled portion is 1.00 or less.
11. The inductor component according to any one of claims 1 to 4, wherein, At the end side of the first coil wiring, the first thin-walled portion includes at least a portion corresponding to the entire area overlapping with the end side of the second coil wiring when viewed from the axial direction. At the end side of the second coil wiring, the second thin-walled portion includes at least a portion corresponding to the entire area that overlaps with the end side of the first coil wiring when viewed from the axial direction.
12. The inductor component according to any one of claims 1 to 4, wherein, The first thick-walled portion and the first thin-walled portion are adjacent to each other and integrally formed.
13. The inductor component according to any one of claims 1 to 4, wherein, The aforementioned second thick-walled portion and the aforementioned second thin-walled portion are adjacent to each other and integrally formed.
14. The inductor component according to any one of claims 1 to 4, wherein, The end faces of the conductive electrodes that are connected to the first thin-walled portion and the second thin-walled portion are circular in shape, and the diameter of the end faces is 30 μm or more and 50 μm or less.