Inductor component

Abstract

To provide an inductor component which improves inductance characteristics and Q characteristics.SOLUTION: An electronic component includes an element body 10, a coil 20 provided in the element body, and first and second external electrodes 30, 40 provided on the element body and electrically connected to the coil, wherein the element body includes first and second end surfaces 15, 16, a bottom surface 17, and a top surface 18, and the first external electrode has a first end surface portion extending along the first end surface 15 and a first bottom surface portion connected to the first end surface portion and extending along the bottom surface. The second external electrode includes a second end surface portion extending along the second end surface and a second bottom surface portion connected to the second end surface portion and extending along the bottom surface, the axis is parallel to the bottom surface and intersects the first side surface and the second side surface, and when viewed in the axial direction, the coil is annularly arranged from a first portion facing the top surface to eighth portions 21 to 28 facing the second end surface, the second portion is closer to the first end surface than the third portion, the eighth portion is closer to the second end surface than the seventh portion, and the fifth portion is closer to the bottom surface than the fourth portion and the sixth portion.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to inductor components. [Background technology]

[0002] A conventional inductor component is described in Japanese Patent Application Laid-Open No. 2017-92447 (Patent Document 1). This inductor component has an element body, a coil provided within the element body and wound spirally along an axis, and a first external electrode and a second external electrode provided on the element body and electrically connected to the coil. The first external electrode and the second external electrode are each L-shaped. The coil is formed in a rectangular shape when viewed in the axial direction and is disposed between the first external electrode and the second external electrode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-92447 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional inductor component described above, the coil is disposed between the first and second external electrodes when viewed in the axial direction, and therefore the size of the inner diameter of the coil is restricted by the first and second external electrodes, making it difficult to increase the inner diameter of the coil and improve the inductance and Q characteristics.

[0005] Therefore, an object of the present disclosure is to provide an inductor component that can improve the inductance characteristics and Q characteristics. [Means for solving the problem]

[0006] In order to solve the above problems, an inductor component according to one aspect of the present disclosure comprises: The base body and a coil provided within the element body and wound spirally along an axis; a first external electrode and a second external electrode provided on the element body and electrically connected to the coil; Equipped with the element body includes a first end face and a second end face facing each other, a first side face and a second side face facing each other, a bottom face connected between the first end face and the second end face and between the first side face and the second side face, and a top face facing the bottom face, the first external electrode has a first end surface portion extending along the first end surface and a first bottom surface portion connected to the first end surface portion and extending along the bottom surface; the second external electrode has a second end surface portion extending along the second end surface and a second bottom surface portion connected to the second end surface portion and extending along the bottom surface, the axis is parallel to the bottom surface and intersects the first side surface and the second side surface; When viewed from the axial direction, the coil has a first portion facing the top surface, a second portion facing the first end surface, a third portion facing the first end surface, a fourth portion facing the first bottom surface, a fifth portion facing the bottom surface, a sixth portion facing the second bottom surface, a seventh portion facing the second end surface, and an eighth portion facing the second end surface; the first portion, the second portion, the third portion, the fourth portion, the fifth portion, the sixth portion, the seventh portion, and the eighth portion are arranged in annular order, The second portion is closer to the first end face side than the third portion, the eighth portion is closer to the second end face side than the seventh portion, and the fifth portion is closer to the bottom face side than the fourth portion and the sixth portion.

[0007] According to the above aspect, the second portion is closer to the first end surface than the third portion, the eighth portion is closer to the second end surface than the seventh portion, and the fifth portion is closer to the bottom surface than the fourth and sixth portions. This allows the second, fifth, and eighth portions, which do not face the first and second external electrodes, to be spread radially outward of the coil. In this way, the coil can be spread to a region of the element body that does not interfere with the first and second external electrodes, thereby increasing the inner diameter of the coil and improving the inductance characteristics and Q characteristics. [Effects of the Invention]

[0008] According to an inductor component according to one aspect of the present disclosure, the inductance characteristics and Q characteristics can be improved. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a first embodiment of an inductor component. [Figure 2] 3 is a perspective front view of the inductor component as seen from a first side surface side. FIG. [Figure 3A] FIG. 2 is an exploded plan view of the inductor component. [Figure 3B] FIG. 2 is an exploded plan view of the inductor component. [Figure 4] 3 is a perspective front view of the inductor component as seen from a first side surface side. FIG. [Figure 5] 10 is a partially enlarged perspective front view showing a second embodiment of the inductor component as viewed from a first side surface side. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an inductor component according to one aspect of the present disclosure will be described in detail with reference to the illustrated embodiments. Note that the drawings include some schematic views and may not reflect actual dimensions or proportions.

[0011] (First embodiment) FIG. 1 is a perspective view showing a first embodiment of an inductor component. FIG. 2 is a see-through front view of the inductor component as seen from a first side surface. FIGS. 3A and 3B are exploded plan views of the inductor component. As shown in FIGS. 1, 2, 3A, and 3B, the inductor component 1 includes an element body 10, a coil 20 provided within the element body 10 and wound spirally along an axis AX, and a first external electrode 30 and a second external electrode 40 provided in the element body 10 and electrically connected to the coil 20. For convenience, the element body and coil are depicted as transparent in FIG. 2 to facilitate understanding of the structure, but they may also be translucent or opaque.

[0012] The inductor component 1 is electrically connected to wiring on a circuit board (not shown) via first and second external electrodes 30, 40. The inductor component 1 is used, for example, as an impedance matching coil (matching coil) for high-frequency circuits, and is used in electronic devices such as personal computers, DVD players, digital cameras, TVs, mobile phones, car electronics, and medical and industrial machinery. However, the uses of the inductor component 1 are not limited to this, and it can also be used, for example, in tuning circuits, filter circuits, rectifying and smoothing circuits, and the like.

[0013] The element body 10 is formed in a substantially rectangular parallelepiped shape. The surfaces of the element body 10 include a first end face 15 and a second end face 16 that face each other, a first side face 13 and a second side face 14 that face each other, a bottom face 17 that is connected between the first end face 15 and the second end face 16 and between the first side face 13 and the second side face 14, and a top face 18 that faces the bottom face 17. The bottom face 17 is the face that faces the mounting board (not shown) when the inductor component 1 is mounted on the mounting board.

[0014] As shown in the figure, the X direction is perpendicular to the first end face 15 and the second end face 16 and is the direction from the first end face 15 to the second end face 16. The Y direction is perpendicular to the first side face 13 and the second side face 14 and is the direction from the second side face 14 to the first side face 13. The Z direction is perpendicular to the bottom face 17 and the top face 18 and is the direction from the bottom face 17 to the top face 18. The X direction is also referred to as the length direction of the element body 10, the Y direction is also referred to as the width direction of the element body 10, and the Z direction is also referred to as the height direction of the element body 10. The X direction, Y direction, and Z direction are perpendicular to each other and, when arranged in the order X, Y, Z, form a left-handed system.

[0015] The element body 10 is formed by stacking multiple insulating layers 11. The insulating layers 11 are made of, for example, a material primarily composed of borosilicate glass, ferrite, resin, or other material. The stacking direction of the insulating layers 11 is a direction (Y direction) parallel to the first and second end faces 15 and 16 and the bottom face 17 of the element body 10. That is, the insulating layers 11 are layered and extend across the XZ plane. In this application, "parallel" is not limited to a strict parallel relationship, but also includes a substantial parallel relationship, taking into account a realistic range of variation. Note that in the element body 10, the interfaces between the multiple insulating layers 11 may not be clear due to firing or other reasons. Note that in Figures 3A and 3B, the stacking direction (Y direction) is from top to bottom.

[0016] The first external electrode 30 and the second external electrode 40 are made of a conductive material such as Ag, Cu, Au, or an alloy containing any of these as its main components. The first external electrode 30 is L-shaped and extends from the first end face 15 to the bottom face 17. The first external electrode 30 is embedded in the element body 10 so as to be exposed from the first end face 15 and the bottom face 17. The first external electrode 30 has a first end face portion 31 that extends along the first end face 15, and a first bottom face portion 32 that is connected to the first end face portion 31 and extends along the bottom face 17.

[0017] The second external electrode 40 has an L-shape extending from the second end face 16 to the bottom face 17. The second external electrode 40 is embedded in the element body 10 so as to be exposed from the second end face 16 and the bottom face 17. The second external electrode 40 has a second end face portion 41 extending along the second end face 16, and a second bottom face portion 42 connected to the second end face portion 41 and extending along the bottom face 17.

[0018] The first external electrode 30 has a configuration in which a plurality of first external electrode conductor layers 33 embedded in the element body 10 (insulating layer 11) are laminated. The second external electrode 40 has a configuration in which a plurality of second external electrode conductor layers 43 embedded in the element body 10 (insulating layer 11) are laminated. The first external electrode conductor layers 33 extend along the first end face 15 and the bottom face 17, and the second external electrode conductor layers 43 extend along the second end face 16 and the bottom face 17.

[0019] This allows the first and second external electrodes 30, 40 to be embedded within the element body 10, thereby making it possible to reduce the size of the inductor component compared to a configuration in which external electrodes are externally attached to the element body 10. Furthermore, the coil 20 and the external electrodes 30, 40 can be formed in the same process, reducing variation in the positional relationship between the coil 20 and the external electrodes 30, 40, thereby reducing variation in the electrical characteristics of the inductor component 1.

[0020] The coil 20 is made of, for example, the same conductive material as the first and second external electrodes 30, 40. The coil 20 is wound spirally along the lamination direction of the insulating layers 11. A first end of the coil 20 is connected to the first external electrode 30, and a second end of the coil 20 is connected to the second external electrode 40. In this embodiment, the coil 20 and the first and second external electrodes 30, 40 are integrated and no clear boundary exists between them, but this is not limiting, and a boundary may exist between them by forming the coil and the external electrodes using different materials or different manufacturing methods.

[0021] The coil 20 is wound along the axis AX so that the axis AX is parallel to the bottom surface 17 and intersects the first side surface 13 and the second side surface 14. The axis AX of the coil 20 coincides with the lamination direction (Y direction) of the insulating layers 11. The axis AX of the coil 20 refers to the central axis of the spiral shape of the coil 20.

[0022] The coil 20 has a winding portion 20a, a first lead portion 20b connected between a first end of the winding portion 20a and the first external electrode 30, and a second lead portion 20c connected between a second end of the winding portion 20a and the second external electrode 40. In this embodiment, the winding portion 20a and the first and second lead portions 20b, 20c are integrated together, and no clear boundary exists between them, but this is not limiting, and a boundary may exist between the winding portion and the lead portions by forming them using different materials or different manufacturing methods.

[0023] The winding portion 20a is wound spirally along the axis AX. That is, the winding portion 20a refers to the spirally wound portion where the coils 20 overlap each other when viewed parallel to the axis AX. The first and second lead-out portions 20b and 20c refer to the portions outside the overlapping portions.

[0024] 2, when viewed in the direction of axis AX of coil 20, coil 20 has a first portion 21 facing top surface 18, a second portion 22 facing first end surface 15, a third portion 23 facing first end surface portion 31, a fourth portion 24 facing first bottom surface portion 32, a fifth portion 25 facing bottom surface 17, a sixth portion 26 facing second bottom surface portion 42, a seventh portion 27 facing second end surface portion 41, and an eighth portion 28 facing second end surface 16. Unless otherwise specified, the boundaries between first portion 21 to eighth portion 28 are the portions facing the boundaries between each of surfaces 15, 16, 17, and 18 and each of portions 31, 32, 41, and 42, and are specifically indicated by dashed dotted lines in FIG. 2.

[0025] The first portion 21, the second portion 22, the third portion 23, the fourth portion 24, the fifth portion 25, the sixth portion 26, the seventh portion 27, and the eighth portion 28 are arranged in a circular pattern in this order. In this embodiment, the first portion 21 to the eighth portion 28 are arranged counterclockwise.

[0026] The second portion 22 is closer to the first end face 15 than the third portion 23. That is, the second portion 22 has a larger area on the first end face 15 side than the third portion 23. Similarly, the eighth portion 28 is closer to the second end face 16 than the seventh portion 27. That is, the eighth portion 28 has a larger area on the second end face 16 side than the seventh portion 27. Similarly, the fifth portion 25 is closer to the bottom face 17 than the fourth portion 24 and the sixth portion 26. That is, the fifth portion 25 has a larger area on the bottom face 17 side than the fourth portion 24 and the sixth portion 26.

[0027] According to the above configuration, the second portion 22 is closer to the first end face 15 than the third portion 23, the eighth portion 28 is closer to the second end face 16 than the seventh portion 27, and the fifth portion 25 is closer to the bottom face 17 than the fourth portion 24 and the sixth portion 26. This allows the second portion 22, the fifth portion 25, and the eighth portion 28, which do not face the first external electrode 30 and the second external electrode 40, to extend radially outward from the coil 20. In this way, the coil 20 can be extended to a region of the element body 10 that does not interfere with the first external electrode 30 and the second external electrode 40, thereby increasing the inner diameter of the coil 20 and improving the inductance characteristics and Q characteristics.

[0028] Furthermore, even if the inner diameter of the coil 20 is increased, it does not interfere with the first external electrode 30 and the second external electrode 40, so there is no need to increase the size of the element body 10, and the element body 10 can be made smaller.

[0029] 2, the first portion 21, the third portion 23, the fifth portion 25, and the seventh portion 27 each include a straight portion when viewed in the direction of the axis AX of the coil 20. According to the above configuration, the first portion 21, the third portion 23, the fifth portion 25, and the seventh portion 27 can be easily manufactured, and variations in the inductor component 1 can be suppressed.

[0030] Specifically, first portion 21 includes a straight portion parallel to top surface 18. A first end of the straight portion of first portion 21 is connected to second portion 22, and a second end of the straight portion of first portion 21 is connected to eighth portion 28.

[0031] The third portion 23 includes a straight portion parallel to the first end surface portion 31. A first end of the straight portion of the third portion 23 is connected to the second portion 22, and a second end of the straight portion of the third portion 23 is connected to the fourth portion 24.

[0032] The seventh portion 27 includes a straight portion that is parallel to the second end surface portion 41. A first end of the straight portion of the seventh portion 27 is connected to the sixth portion 26, and a second end of the straight portion of the seventh portion 27 is connected to the eighth portion 28.

[0033] The fifth portion 25 includes a straight portion 254 parallel to the bottom surface 17, a first curved portion 251 connected between a first end of the straight portion 254 and the fourth portion 24, and a second curved portion 252 connected between a second end of the straight portion 254 and the sixth portion 26. The first curved portion 251 and the second curved portion 252 are convex radially outward of the coil 20. The boundary between the first curved portion 251 and the fourth portion 24 and the boundary between the second curved portion 252 and the sixth portion 26 are convex radially inward of the coil 20. The curved portions correspond to, for example, circular arcs. The boundaries between the first curved portion 251, the second curved portion 252, and the straight portion 254 are indicated by dotted lines in FIG. 2.

[0034] 2, the fourth portion 24 and the sixth portion 26 are formed in a curved shape when viewed along the axis AX of the coil 20. A curved shape means that the fourth portion 24 and the sixth portion 26 do not include any straight portions and are composed of at least one curved portion. With this configuration, even if thermal stress or bending stress is applied to the inductor component 1 during mounting, the fourth portion 24 and the sixth portion 26 do not include any straight portions, so the stress applied to the fourth portion 24 and the sixth portion 26 can be reduced.

[0035] Specifically, the boundary between the fourth portion 24 and the fifth portion 25 is a curved portion that convexly faces radially inward of the coil 20. The boundary between the fourth portion 24 and the third portion 23 is a curved portion that convexly faces radially outward of the coil 20. The fourth portion 24 is formed by connecting these two curved portions. Similarly, the boundary between sixth portion 26 and fifth portion 25 is a curved portion that convex radially inward of coil 20. The boundary between sixth portion 26 and seventh portion 27 is a curved portion that convex radially outward of coil 20. Sixth portion 26 is formed by connecting these two curved portions.

[0036] As shown in FIG. 2 , when viewed in the direction of axis AX of coil 20, second portion 22 has, in order from first portion 21 to third portion 23, a first curved portion 221 that convexes radially outward of coil 20, a straight portion 224 that is parallel to first end face 15, a second curved portion 222 that convexes radially outward of coil 20, and a third curved portion 223 that convex radially inward of coil 20. First curved portion 221 is connected to first portion 21. Third curved portion 223 is connected to third portion 23. Boundaries between first curved portion 221, second curved portion 222, third curved portion 223, and straight portion 224 are indicated by dotted lines in FIG. 2 . According to the above configuration, the second portion 22 includes the first curved portion 221, the second curved portion 222, and the third curved portion 223, so that even if thermal stress or bending stress is applied to the inductor component 1 during mounting, the stress applied to the second portion 22 can be reduced.

[0037] Similarly, when viewed in the direction of the axis AX of the coil 20, the eighth portion 28 includes, in order from the first portion 21 to the seventh portion 27, a first curved portion 281 that convexly extends radially outward from the coil 20, a straight portion 284 that is parallel to the first end face 15, a second curved portion 282 that convexly extends radially outward from the coil 20, and a third curved portion 283 that convexly extends radially inward from the coil 20. The first curved portion 281 is connected to the first portion 21. The third curved portion 283 is connected to the seventh portion 27. The boundaries between the first curved portion 281, the second curved portion 282, the third curved portion 283, and the straight portion 284 are indicated by dotted lines in FIG. 2 . According to the above configuration, the eighth portion 28 includes the first curved portion 281, the second curved portion 282, and the third curved portion 283. Therefore, even if thermal stress or bending stress is applied to the inductor component 1 during mounting, stress acting on the eighth portion 28 can be reduced.

[0038] 2, when viewed in the direction of the axis AX of the coil 20, the shape of the coil 20 is symmetrical with respect to a line that passes through the axis AX of the coil 20 and is parallel to the Z direction. This makes it possible to suppress variations in the characteristics of the inductor component 1.

[0039] Specifically, the second portion 22 and the eighth portion 28 are symmetrical with respect to a line that passes through the axis AX of the coil 20 and is parallel to the Z direction. The third portion 23 and the seventh portion 27 are symmetrical with respect to a line that passes through the axis AX of the coil 20 and is parallel to the Z direction. The first portion 21 is symmetrical with respect to a line that passes through the axis AX of the coil 20 and is parallel to the Z direction. The fifth portion 25 is symmetrical with respect to a line that passes through the axis AX of the coil 20 and is parallel to the Z direction.

[0040] 2, when viewed in the direction of axis AX, second portion 22 includes a portion that extends obliquely with respect to bottom surface 17 toward third portion 23. Specifically, second curved portion 222 and third curved portion 223 of second portion 22 extend obliquely with respect to bottom surface 17. This reduces the number of bends in coil 20, thereby suppressing signal reflection and improving the Q value. Similarly, when viewed from the direction of axis AX, eighth portion 28 includes a portion that extends obliquely toward seventh portion 27 with respect to bottom surface 17. Specifically, second curved portion 282 and third curved portion 283 of eighth portion 22 extend obliquely with respect to bottom surface 17. This reduces the number of bends in coil 20, thereby suppressing signal reflection and improving the Q value.

[0041] 2, when viewed from the direction of axis AX, the boundary between the fourth portion 24 and the fifth portion 25 extends in a diagonal direction with respect to the bottom surface 17. Specifically, a tangent to the boundary between the fourth portion 24 and the fifth portion 25 extends in a diagonal direction with respect to the bottom surface 17. This reduces the number of bends in the coil 20, thereby suppressing signal reflection and improving the Q value. Similarly, when viewed from the direction of the axis AX, the boundary between the fifth portion 25 and the sixth portion 26 extends in a diagonal direction with respect to the bottom surface 17. Specifically, a tangent to the boundary between the fifth portion 25 and the sixth portion 26 extends in a diagonal direction with respect to the bottom surface 17. This reduces the number of bends in the coil 20, thereby suppressing signal reflection and improving the Q value.

[0042] 4 is a perspective front view of the inductor component 1 as viewed from the first side surface 13. As shown in FIG. 4, when viewed from the direction of the axis AX of the coil 20, the first shortest distance d1 between the second portion 22 and the first end face 15 is preferably 5 μm or more and 28 μm or less. In this embodiment, the first shortest distance d1 is the shortest distance between the straight portion 224 of the second portion 22 and the first end face 15.

[0043] Similarly, when viewed from the axial direction AX of the coil 20, the second shortest distance d2 between the eighth portion 28 and the second end face 16 is preferably not less than 5 μm and not more than 28 μm. In this embodiment, the second shortest distance d2 is the shortest distance between the straight portion 284 of the eighth portion 28 and the second end face 16. The first shortest distance d1 and the second shortest distance d2 are measured, for example, by polishing the inductor component 1 along the XY plane and measuring the first shortest distance d1 and the second shortest distance d2.

[0044] According to the above configuration, the first shortest distance d1 and the second shortest distance d2 are not more than the upper limit values, which improves the inductance characteristics and Q characteristics, and when the element body 10 is made of glass, it becomes easy to select the appearance of the coil 20. The first shortest distance d1 and the second shortest distance d2 are not less than the lower limit values, which prevents the coil 20 from being exposed from the element body 10. It is sufficient that at least one of the first shortest distance d1 and the second shortest distance d2 satisfies the above range.

[0045] As shown in FIG. 4 , when viewed in the direction of the axis AX of the coil 20, the perimeter L1 of the outer periphery of the coil 20 is preferably 70% or more of the perimeter L2 of the outer periphery of the element body 10. Specifically, the perimeter L1 of the outer periphery of the coil 20 is the perimeter of the outer periphery of the winding portion 20a of the coil 20. The perimeter L2 of the outer periphery of the element body 10 is the perimeter of the top surface 18, the bottom surface 17, the first end surface 15, and the second end surface 16 of the element body 10. The perimeter L1 of the outer periphery of the coil 20 can be measured, for example, by transmitting X-rays through the inductor component 1 from the Y direction to obtain an image, and the perimeter L1 can be determined from this image. According to the above configuration, by increasing the perimeter L1 of the outer periphery of the coil 20, the inner diameter of the coil 20 can be increased, thereby improving the inductance characteristics and Q characteristics. In addition, when the number of windings of the coil wiring layers 501 to 510 is one or more, for example, there are multiple outer circumferences of the winding portion 20a of the coil 20 when viewed through X-rays from the Y direction, the length of the outermost outer circumferences connected together is defined as the circumferential length L1.

[0046] Furthermore, when viewed from the direction of the axis AX of the coil 20, the perimeter (top surface side perimeter) L1a of the outer periphery of the coil 20 located closer to the top surface 18 than the center M of the body 10 is preferably 105% or more of the perimeter (bottom surface side perimeter) L1b of the outer periphery of the coil 20 located closer to the bottom surface 17 than the center M of the body 10.

[0047] In this embodiment, the center M of the element body 10 refers to the center of gravity of the element body 10, and more specifically, refers to the center of gravity of the first side surface 13 of the element body 10 when viewed from the axial AX direction of the coil 20. The top surface 18 side of the center M of the element body 10 refers to the top surface 18 side of the center line N that passes through the center M of the element body 10 and is parallel to the X direction, and the top surface side perimeter L1a refers to the length of the perimeter L1 of the outer perimeter of the coil 20 that is closer to the top surface 18 than the center line N. The bottom surface 17 side of the center M of the element body 10 refers to the bottom surface 17 side of the center line N that passes through the center M of the element body 10 and is parallel to the X direction, and the bottom surface side perimeter L1b refers to the length of the perimeter L1 of the outer perimeter of the coil 20 that is closer to the bottom surface 17 than the center line N.

[0048] According to the above configuration, the center of gravity of the coil 20 can be positioned closer to the top surface 18 than the center M of the element body 10. As a result, the centers of gravity of the first external electrode 30 and the second external electrode 40 are located closer to the bottom surface 17 than the center M of the element body 10, but by positioning the center of gravity of the coil 20 closer to the top surface 18 than the center M of the element body 10, the center of gravity of the inductor component 1 can be positioned near and including the center M of the element body 10. Therefore, the transportability of the inductor component 1 can be improved.

[0049] 3A and 3B, the coil 20 has a plurality of coil wiring layers 501-510 stacked along the axis AX, and a plurality of via wiring layers 601-609 located between adjacent coil wiring layers in the direction of the axis AX and connecting the adjacent coil wiring layers in the direction of the axis AX. The plurality of coil wiring layers 501-510 are each provided on an insulating layer 11, and the plurality of via wiring layers 601-609 are each provided on the insulating layer 11.

[0050] The multiple coil wiring layers 501-510 are each wound along a plane and electrically connected in series to form a spiral. The multiple coil wiring layers 501-510 are wound on the main surface (XZ plane) of the insulating layer 11 that is perpendicular to the axial direction AX (Y direction). The number of turns of each coil wiring layer 501-510 is less than one turn, but may be one or more turns.

[0051] The via wiring layers 601-609 penetrate the insulating layer 11 in the thickness direction (Y direction). The coil wiring layers adjacent to each other in the stacking direction are electrically connected in series through the via wiring layers. In this way, the coil wiring layers 501-510 are electrically connected in series to each other and form a spiral.

[0052] Specifically, a first coil wiring layer 501, a second coil wiring layer 502, a third coil wiring layer 503, a fourth coil wiring layer 504, a fifth coil wiring layer 505, a sixth coil wiring layer 506, a seventh coil wiring layer 507, an eighth coil wiring layer 508, a ninth coil wiring layer 509, and a tenth coil wiring layer 510 are stacked in this order along the Y direction. An end of the first coil wiring layer 501 is connected to the first external electrode conductor layer 33 of the first external electrode 30. An end of the tenth coil wiring layer 510 is connected to the second external electrode conductor layer 43 of the second external electrode 40.

[0053] The first via wiring layer 601 is located between the first coil wiring layer 501 and the second coil wiring layer 502 and connects an end of the first coil wiring layer 501 to an end of the second coil wiring layer 502. The second via wiring layer 602 is located between the second coil wiring layer 502 and the third coil wiring layer 503 and connects an end of the second coil wiring layer 502 to an end of the third coil wiring layer 503. The third via wiring layer 603 is located between the third coil wiring layer 503 and the fourth coil wiring layer 504 and connects an end of the third coil wiring layer 503 to an end of the fourth coil wiring layer 504. The fourth via wiring layer 604 is located between the fourth coil wiring layer 504 and the fifth coil wiring layer 505 and connects an end of the fourth coil wiring layer 504 to an end of the fifth coil wiring layer 505. The fifth via wiring layer 605 is located between the fifth coil wiring layer 505 and the sixth coil wiring layer 506 , and connects the end of the fifth coil wiring layer 505 to the end of the sixth coil wiring layer 506 .

[0054] The sixth via wiring layer 606 is located between the sixth coil wiring layer 506 and the seventh coil wiring layer 507 and connects an end of the sixth coil wiring layer 506 to an end of the seventh coil wiring layer 507. The seventh via wiring layer 607 is located between the seventh coil wiring layer 507 and the eighth coil wiring layer 508 and connects an end of the seventh coil wiring layer 507 to an end of the eighth coil wiring layer 508. The eighth via wiring layer 608 is located between the eighth coil wiring layer 508 and the ninth coil wiring layer 509 and connects an end of the eighth coil wiring layer 508 to an end of the ninth coil wiring layer 509. The ninth via wiring layer 609 is located between the ninth coil wiring layer 509 and the tenth coil wiring layer 510 and connects an end of the ninth coil wiring layer 509 to an end of the tenth coil wiring layer 510.

[0055] 3A, 3B, and 4, when viewed in the direction of the axis AX, the multiple via wiring layers 601 to 609 include a via wiring layer having a shape corresponding to the second portion 22. Specifically, the via wiring layer having a shape corresponding to the second portion 22 is a sixth via wiring layer 606. When viewed in the direction of the axis AX, the sixth via wiring layer 606 has a first curved portion 606a corresponding to the first curved portion 221 of the second portion 22, a straight portion 606d corresponding to the straight portion 224 of the second portion 22, a second curved portion 606b corresponding to the second curved portion 222 of the second portion 22, and a third curved portion 606c corresponding to the third curved portion 223 of the second portion 22.

[0056] According to the above configuration, when viewed from the direction of axis AX, the sixth via wiring layer 606 has a shape corresponding to the second portion 22 and includes a first curved portion 606a, a second curved portion 606b, and a third curved portion 606c. Therefore, even if thermal stress or bending stress is applied to the inductor component 1 during implementation, the stress applied to the sixth via wiring layer 606 can be reduced.

[0057] Similarly, when viewed in the direction of the axis AX, the multiple via wiring layers 601 to 609 include a via wiring layer having a shape corresponding to the eighth portion 28. Specifically, the via wiring layer having a shape corresponding to the eighth portion 28 is a fourth via wiring layer 604. When viewed in the direction of the axis AX, the fourth via wiring layer 604 has a first curved portion 604a corresponding to the first curved portion 281 of the eighth portion 28, a straight portion 604d corresponding to the straight portion 284 of the eighth portion 28, a second curved portion 604b corresponding to the second curved portion 282 of the eighth portion 28, and a third curved portion 604c corresponding to the third curved portion 283 of the eighth portion 28.

[0058] According to the above configuration, when viewed from the direction of axis AX, the fourth via wiring layer 604 has a shape corresponding to the eighth portion 28 and includes the first curved portion 604a, the second curved portion 604b, and the third curved portion 604c. Therefore, even if thermal stress or bending stress is applied to the inductor component 1 during implementation, the stress applied to the fourth via wiring layer 604 can be reduced.

[0059] As shown in Figures 3A, 3B, and 4, when viewed in the direction of axis AX, the first to tenth coil wiring layers 501 to 510 overlap the first to eighth portions 21 to 28, respectively, the fifth via wiring layer 605 overlaps the first portion 21, the sixth via wiring layer 606 overlaps the second portion 22, the first and seventh via wiring layers 601 and 607 overlap the third portion 23 and the fourth portion 24, respectively, the second and eighth via wiring layers 602 and 608 overlap the fifth portion 25, the third and ninth via wiring layers 603 and 609 overlap the sixth portion 26 and the seventh portion 27, respectively, and the fourth via wiring layer 604 overlaps the eighth portion 28.

[0060] In other words, the first portion 21 is composed of a portion of each of the first to tenth coil wiring layers 501-510 and the fifth via wiring layer 605. The second portion 22 is composed of a portion of each of the first to tenth coil wiring layers 501-510 and the sixth via wiring layer 606. The third portion 23 is composed of a portion of each of the first to tenth coil wiring layers 501-510 and a portion of each of the first and seventh via wiring layers 601, 607. The fourth portion 24 is composed of a portion of each of the first to tenth coil wiring layers 501-510 and a portion of each of the first and seventh via wiring layers 601, 607. The fifth portion 25 is composed of a portion of each of the first to tenth coil wiring layers 501-510 and the second and eighth via wiring layers 602, 608. The sixth portion 26 is composed of a portion of each of the first to tenth coil wiring layers 501-510 and a portion of each of the third and ninth via wiring layers 603, 609. The seventh portion 27 is composed of a portion of each of the first to tenth coil wiring layers 501-510 and a portion of each of the third and ninth via wiring layers 603, 609. The eighth portion 28 is composed of a portion of each of the first to tenth coil wiring layers 501-510 and the fourth via wiring layer 604. Note that the first to eighth portions 21-28 may be composed of any portion of the coil wiring layers 501-510 and the via wiring layers 601-609.

[0061] Next, a method for manufacturing the inductor element 1 will be described.

[0062] 3A and 3B, the inductor component 1 is manufactured by alternately stacking first to tenth coil wiring layers 501-510 and first to ninth via wiring layers 601-609 together with insulating layers 11 from top to bottom in the figures. The coil wiring layers 501-510 are provided on the insulating layer 11 by, for example, screen printing. Openings are provided in the insulating layer 11 by, for example, photolithography or laser processing, and the via wiring layers 601-609 are provided in the openings by, for example, screen printing.

[0063] (Second embodiment) 5 is a partially enlarged perspective front view of a second embodiment of the inductor component as seen from the first side. The second embodiment differs from the first embodiment in the shape of the second portion of the coil. This difference in configuration will be explained below. The other components are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are used, and their explanation will be omitted.

[0064] 5, in the coil 20A of the inductor component 1A of the second embodiment, the second portion 22A is formed in a curved shape when viewed in the axial direction AX of the coil 20A (the direction perpendicular to the first side surface 13). Specifically, in the second portion 22A of the second embodiment, the straight portion 224 of the second portion 22 of the first embodiment is replaced with a fourth curved portion 225. The fourth curved portion 225 is convex radially outward of the coil 20A. Note that the fourth curved portion 225 may form an arc having the same radius of curvature together with the first curved portion 221 and the second curved portion 222 on either side of the fourth curved portion 225.

[0065] According to the above configuration, even if thermal stress or bending stress is applied to the inductor component 1A during mounting, the second portion 22A does not have a straight portion, so the stress applied to the second portion 22A can be reduced. Similarly, the eighth portion may be formed in a curved shape. That is, the straight portion of the eighth portion of the first embodiment may be a curved portion that protrudes radially outward from the coil. This reduces the stress applied to the eighth portion because the eighth portion does not have a straight portion. Furthermore, at least one of the second portion, the fourth portion, the sixth portion, and the eighth portion may be formed in a curved shape.

[0066] The present disclosure is not limited to the above-described embodiments, and design modifications are possible within the scope of the present disclosure. For example, the features of the first and second embodiments may be combined in various ways. The number of coil wiring layers may be increased or decreased, and the number of via wiring layers may be increased or decreased. The first to eighth portions may include straight portions or may be formed in a curved shape.

[0067] The present disclosure includes the following aspects. <1> The base body and a coil provided within the element body and wound spirally along an axis; a first external electrode and a second external electrode provided on the element body and electrically connected to the coil; Equipped with the element body includes a first end face and a second end face facing each other, a first side face and a second side face facing each other, a bottom face connected between the first end face and the second end face and between the first side face and the second side face, and a top face facing the bottom face, the first external electrode has a first end surface portion extending along the first end surface and a first bottom surface portion connected to the first end surface portion and extending along the bottom surface; the second external electrode has a second end surface portion extending along the second end surface and a second bottom surface portion connected to the second end surface portion and extending along the bottom surface, the axis is parallel to the bottom surface and intersects the first side surface and the second side surface; When viewed from the axial direction, the coil has a first portion facing the top surface, a second portion facing the first end surface, a third portion facing the first end surface, a fourth portion facing the first bottom surface, a fifth portion facing the bottom surface, a sixth portion facing the second bottom surface, a seventh portion facing the second end surface, and an eighth portion facing the second end surface; the first portion, the second portion, the third portion, the fourth portion, the fifth portion, the sixth portion, the seventh portion, and the eighth portion are arranged in annular order, an inductor component, wherein the second portion is closer to the first end face side than the third portion, the eighth portion is closer to the second end face side than the seventh portion, and the fifth portion is closer to the bottom face side than the fourth portion and the sixth portion. <2> When viewed in the axial direction, the first portion, the third portion, the fifth portion, and the seventh portion each include a straight portion. <1> The inductor component according to claim 1. <3> When viewed in the axial direction, at least one of the second portion, the fourth portion, the sixth portion, and the eighth portion is formed in a curved shape. <1> or <2> The inductor component according to claim 1. <4> When viewed in the axial direction, a first shortest distance between the second portion and the first end face is not less than 5 μm and not more than 28 μm, and a second shortest distance between the eighth portion and the second end face is not less than 5 μm and not more than 28 μm. <1> from <3> 10. An inductor component according to any one of the preceding claims. <5> When viewed from the axial direction, the perimeter of the coil is 70% or more of the perimeter of the element body, the perimeter of the outer periphery of the coil located closer to the top surface than the center of the element body is 105% or more of the perimeter of the outer periphery of the coil located closer to the bottom surface than the center of the element body; <1> from <4> 10. An inductor component according to any one of the preceding claims. <6> When viewed from the axial direction, The second portion has, in order from the first portion to the third portion, a first curved portion that is convex radially outward of the coil, a straight portion that is parallel to the first end face, a second curved portion that is convex radially outward of the coil, and a third curved portion that is convex radially inward of the coil. <1> from <5> 10. An inductor component according to any one of the preceding claims. <7> the coil has a plurality of coil wiring layers stacked along the axis and a plurality of via wiring layers connected between adjacent coil wiring layers in the axial direction, When viewed from the axial direction, the plurality of via wiring layers include a via wiring layer having a shape corresponding to the second portion. <6> The inductor component according to claim 1. <8> When viewed from the axial direction, the second portion includes a portion extending obliquely with respect to the bottom surface toward the third portion. <1> from <7> 10. An inductor component according to any one of the preceding claims. <9> When viewed from the axial direction, the boundary between the fourth portion and the fifth portion extends in an oblique direction with respect to the bottom surface. <1> from <8> 10. An inductor component according to any one of the preceding claims. <10> The base body and a coil provided within the element body and wound spirally along an axis; a first external electrode and a second external electrode provided on the element body and electrically connected to the coil; Equipped with the element body includes a first end face and a second end face facing each other, a first side face and a second side face facing each other, a bottom face connected between the first end face and the second end face and between the first side face and the second side face, and a top face facing the bottom face, the first external electrode has a first end surface portion extending along the first end surface and a first bottom surface portion connected to the first end surface portion and extending along the bottom surface; the axis is parallel to the bottom surface and intersects the first side surface and the second side surface; When viewed from the axial direction, the coil has a first portion facing the top surface, a second portion facing the first end surface, a third portion facing the first end surface, and a fourth portion facing the first bottom surface; The second portion is closer to the first end face than the third portion. [Explanation of symbols]

[0068] 1. 1A inductor components 10 Base 11 Insulating layer 13 First aspect 14 Second aspect 15 First end surface 16 Second end face 17 Bottom 18 Top 20, 20A coil 20a Winding part 20b 1st drawer 20c 2nd drawer 21~28 Parts 1~8 22A 2nd part 221, 251, 281 1st curve section 222, 252, 282 2nd curve section 223, 283 3rd curve section 224, 254, 284 straight section 225 4th curve section 30 1st external electrode 31 First end section 32 1st bottom part 33 First external electrode conductor layer 40 2nd external electrode 41 Second end section 42 2nd bottom part 43 Second external electrode conductor layer 501 to 510 1st to 10th coil wiring layers 601 to 609 1st to 9th via wiring layers 604a, 606a 1st curve section 604b, 606b 2nd curve section 604c, 606c 3rd curve section 604d, 606d Straight section AX axis d1 1st shortest distance d2 2nd shortest distance L1: Circumference of the coil L1a Top perimeter L1b Bottom perimeter L2 perimeter of the element M Center of the body N center line

Claims

[Claim 1] The base body and a coil provided within the element body and wound spirally along an axis; a first external electrode and a second external electrode provided on the element body and electrically connected to the coil; Equipped with the element body includes a first end surface and a second end surface facing each other, a first side surface and a second side surface facing each other, a bottom surface connected between the first end surface and the second end surface and between the first side surface and the second side surface, and a top surface facing the bottom surface, the first external electrode has a first end surface portion extending along the first end surface and a first bottom surface portion connected to the first end surface portion and extending along the bottom surface; the second external electrode has a second end surface portion extending along the second end surface and a second bottom surface portion connected to the second end surface portion and extending along the bottom surface, the axis is parallel to the bottom surface and intersects the first side surface and the second side surface; When viewed from the axial direction, the coil has a first portion facing the top surface, a second portion facing the first end surface, a third portion facing the first end surface, a fourth portion facing the first bottom surface, a fifth portion facing the bottom surface, a sixth portion facing the second bottom surface, a seventh portion facing the second end surface, and an eighth portion facing the second end surface; the first portion, the second portion, the third portion, the fourth portion, the fifth portion, the sixth portion, the seventh portion, and the eighth portion are arranged in annular shape in this order, an inductor component, wherein the second portion is closer to the first end face side than the third portion, the eighth portion is closer to the second end face side than the seventh portion, and the fifth portion is closer to the bottom face side than the fourth portion and the sixth portion.

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