Inductor component

Abstract

To provide an inductor component capable of suppressing deterioration of a ratio of a Q value against an L value while securing the L value.SOLUTION: An inductor component 1 comprises: an element body 10; a coil 20 that is wound in a spiral shape along a shaft AX; and a first external electrode 30 and a second external electrode 40. The element body contains: first and second end surfaces 15 and 16 that are opposite each other; first and second side surfaces that are opposite to each other; a bottom surface 17 that is 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 18 that is opposite to the bottom surface. The first and second external electrodes are provided to at least the bottom surface. A winding shaft is parallel to the bottom surface and crosses the first and second side surfaces. An inner diameter of the coil when viewed from a shaft direction has: a first inner diameter dimension D1 in a length direction that is opposite to the first and second end surfaces; and a second inner diameter dimension D2 in a height direction that is opposite to the top surface and the bottom surface. One of the first inner diameter dimension and the second inner diameter dimension is larger than the other one. A ratio of an absolute value of a difference between the one inner diameter dimension and the other inner diameter dimension against the other inner diameter dimension is 0.1% or more and 11% or less.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] A conventional inductor component is described in JP 2013-153009 A (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. When viewed from the axial direction, the shape of the inner circumferential surface of the coil is a horizontally long, approximately rectangular shape that follows the vicinity of the outer surface of the element body and the first external electrode and second external electrode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-153009 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional inductor components, the inner peripheral surface of the coil has a horizontally long rectangular shape, which causes a problem that the line length of the coil becomes long, and this increases the resistance of the coil, which may reduce the ratio of the Q value to the L value.

[0005] Therefore, an object of the present disclosure is to provide an inductor component that can suppress a decrease in the ratio of the Q value to the L value while ensuring the L value. [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 body and a coil provided within the element body and wound helically 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 opposing each other, a first side face and a second side face opposing 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 opposing the bottom face, the first external electrode and the second external electrode are provided on at least the bottom surface, the axis is parallel to the bottom surface and intersects the first side surface and the second side surface; When viewed in the axial direction, the inner diameter of the coil includes a first inner diameter dimension in a length direction where the first end surface and the second end surface face each other, and a second inner diameter dimension in a height direction where the top surface and the bottom surface face each other, One of the first inner diameter dimension and the second inner diameter dimension is larger than the other inner diameter dimension, and the ratio of the absolute value of the difference between the one inner diameter dimension and the other inner diameter dimension to the other inner diameter dimension is 0.1% or more and 11% or less.

[0007] Here, the inner diameter of the coil refers to the inside diameter of the coil as viewed from the axial direction, and when the coil is wound in one or more revolutions in a plane perpendicular to the axis, the innermost diameter of the coil as viewed from the axial direction is referred to as the inner diameter of the coil. Also, when the coil windings overlap part or all of them when viewed from the axial direction, the inner diameter of the coil refers to the innermost diameter of the overlapping coil windings. The first inner diameter dimension refers to the largest inner diameter dimension of the inner diameter of the coil in the length direction as viewed from the axial direction. The second inner diameter dimension refers to the largest inner diameter dimension of the inner diameter of the coil in the height direction as viewed from the axial direction.

[0008] According to the above-mentioned embodiment, the ratio of the difference in the inner diameter dimensions, in other words, the difference in the ratio between the inner diameter dimensions, is 0.1% or more, so that the inner area of ​​the coil can be increased and the L value can be secured, compared to when the shape of the inner circumferential surface of the coil is a perfect circle. Since the ratio of the difference in the inner diameter dimensions is 11% or less, the line length of the coil can be shortened and the resistance can be reduced, compared to when the shape of the inner circumferential surface of the coil is a horizontally or vertically elongated oval or rectangle, and the ratio of the Q value to the L value, i.e., the value of the Q value / L value, can be kept at 2.5 or more. Therefore, by making the shape of the inner circumferential surface of the coil closer to a perfect circle or square, the value of the Q value / L value can be kept at 2.5 or more while securing the L value. By keeping the value of the Q value / L value at 2.5 or more, the efficiency of obtaining the Q value can be improved. Effect of the Invention

[0009] According to an inductor component according to an aspect of the present disclosure, it is possible to suppress a decrease in the ratio of the Q value to the L value while ensuring the L value. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a first embodiment of an inductor component. [Diagram 2] 2 is a see-through front view of the inductor component as viewed 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] 2 is a see-through front view of the inductor component as viewed from a first side surface side. FIG. [Diagram 5] 13 is a see-through front view of the inductor component according to a second embodiment of the present invention, seen from a first side surface of the inductor component. FIG. [Figure 6A] FIG. 2 is an exploded plan view of the inductor component. [Figure 6B] FIG. 2 is an exploded plan view of the inductor component. [Figure 7] 13 is a see-through front view of the inductor component according to a third embodiment, seen from a first side surface of the inductor component. FIG. [Figure 8A] FIG. 2 is an exploded plan view of the inductor component. [Figure 8B] FIG. 2 is an exploded plan view of the inductor component. [Figure 8C] FIG. 2 is an exploded plan view of the inductor component. [Figure 9A] FIG. 1 is an example of a graph showing the relationship between the ratio between inner diameters and the ratio of the Q value to the L value. [Figure 9B] FIG. 11 is a graph showing the relationship between the ratio between inner diameter dimensions and the L value. [Figure 9C] FIG. 1 is a graph showing the relationship between the ratio between inner diameter dimensions and the Q value. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an inductor component according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the drawings include some schematic views and may not reflect actual dimensions or proportions.

[0012] (First embodiment) FIG. 1 is a perspective view showing a first embodiment of the inductor component. FIG. 2 is a see-through front view of the inductor component as seen from a first side surface side. 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 has an element body 10, a coil 20 provided in the element body 10 and wound in a spiral shape 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 the coil are drawn transparently in FIG. 2 so that the structure can be easily understood, but they may be semi-transparent or opaque.

[0013] 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, and rectifying and smoothing circuits.

[0014] 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 when the inductor component 1 is mounted on a mounting board (not shown).

[0015] As shown in the figure, the X direction is perpendicular to first end face 15 and second end face 16, and is the direction from first end face 15 to second end face 16. The Y direction is perpendicular to first side face 13 and second side face 14, and is the direction from second side face 14 to first side face 13. The Z direction is perpendicular to bottom face 17 and top face 18, and is the direction from bottom face 17 to top face 18. The X direction, Y direction, and Z direction are perpendicular to each other, and when arranged in the order of X, Y, Z, they form a left-handed system.

[0016] 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 length direction is the direction in which the first end face 15 and the second end face 16 face each other, and is a direction parallel to the straight line connecting the first end face 15 and the second end face 16 at the shortest distance. The width direction is the direction in which the first side face 13 and the second side face 14 face each other, and is a direction parallel to the straight line connecting the first side face 13 and the second side face 14 at the shortest distance. The height direction is the direction in which the top face 18 and the bottom face 17 face each other, and is a direction parallel to the straight line connecting the top face 18 and the bottom face 17 at the shortest distance.

[0017] The element body 10 is formed by stacking a plurality of insulating layers 11. The insulating layers 11 are made of, for example, a material mainly composed of borosilicate glass, ferrite, resin, or the like. The stacking direction of the insulating layers 11 is a direction (Y direction) parallel to the first and second end faces 15, 16 and the bottom face 17 of the element body 10. That is, the insulating layers 11 are in a layered form spreading on the XZ plane. In this application, "parallel" is not limited to a strict parallel relationship, but also includes a substantial parallel relationship in consideration of a realistic range of variation. Note that in the element body 10, the interfaces between the plurality of insulating layers 11 may not be clear due to firing, etc. Note that in FIG. 3A and FIG. 3B, the stacking direction (Y direction) is from top to bottom.

[0018] 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 these as main components. The first external electrode 30 is provided continuously on the bottom surface 17 and the first end surface 15. The first external electrode 30 is L-shaped. The first external electrode 30 is embedded in the element body 10 so as to be exposed from the first end surface 15 and the bottom surface 17. The first external electrode 30 has a first end surface portion 31 extending along the first end surface 15, and a first bottom surface portion 32 connected to the first end surface portion 31 and extending along the bottom surface 17.

[0019] The second external electrode 40 is provided continuously on the bottom surface 17 and the second end surface 16. The second external electrode 40 is L-shaped. The second external electrode 40 is embedded in the element body 10 so as to be exposed from the second end surface 16 and the bottom surface 17. The second external electrode 40 has a second end surface portion 41 extending along the second end surface 16, and a second bottom surface portion 42 connected to the second end surface portion 41 and extending along the bottom surface 17.

[0020] 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 layer 33 extends along the first end face 15 and the bottom face 17, and the second external electrode conductor layer 43 extends along the second end face 16 and the bottom face 17.

[0021] This allows the first and second external electrodes 30, 40 to be embedded in the element body 10, 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, and by reducing variation in the positional relationship between the coil 20 and the external electrodes 30, 40, variation in the electrical characteristics of the inductor component 1 can be reduced.

[0022] The first external electrode 30 may not have a first end surface portion 31 and may be composed of a first bottom surface portion 32, and similarly, the second external electrode 40 may not have a second end surface portion 41 and may be composed of a second bottom surface portion 42. In other words, it is sufficient that the first external electrode 30 and the second external electrode 40 are provided at least on the bottom surface 17 of the element body 10.

[0023] 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 in a spiral shape 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 limited thereto, and a boundary may exist between them by forming the coil and the external electrodes using different materials or different construction methods.

[0024] The coil 20 is wound along the axis AX such 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.

[0025] 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, but this is not limited thereto, and a boundary may exist by forming the winding portion and the lead portions using different materials or different construction methods.

[0026] The winding portion 20a is wound in a spiral shape along the axis AX. In other words, the winding portion 20a refers to the portion of the coils 20 that are wound in a spiral shape and overlap each other when viewed in a direction parallel to the axis AX. The first and second lead-out portions 20b and 20c refer to the portions that are not overlapped.

[0027] When viewed from the axis AX direction 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 variation in the characteristics of the inductor component 1. Specifically, the shape of the winding portion 20a of the coil 20 is a circular ring-shaped body when viewed from the axis AX direction. The shape of the inner peripheral surface of the coil 20 is also circular when viewed from the axis AX direction.

[0028] 3A and 3B, the coil 20 has a plurality of coil wiring layers 51-53 stacked along the axis AX, and a plurality of via wiring layers 61, 62 located between adjacent coil wiring layers in the axis AX direction and connecting the adjacent coil wiring layers in the axis AX direction. The plurality of coil wiring layers 51-53 are each provided on the insulating layer 11, and the plurality of via wiring layers 61, 62 are each provided on the insulating layer 11. When viewed from the axis AX direction, the plurality of coil wiring layers 51-53 and the plurality of via wiring layers 61, 62 extend along the spiral direction of the coil 20.

[0029] Each of the multiple coil wiring layers 51-53 is wound along a plane and electrically connected in series to form a spiral. The multiple coil wiring layers 51-53 are wound on a main surface (XZ plane) of the insulating layer 11 perpendicular to the axis AX direction (Y direction). The number of turns of each of the coil wiring layers 51-53 is less than one turn, but may be one turn or more. Each of the multiple coil wiring layers 51-53 has an arc shape when viewed from the axis AX direction.

[0030] The via wiring layers 61, 62 penetrate the insulating layer 11 in the thickness direction (Y direction). Each of the via wiring layers 61, 62 has an arc shape when viewed from the axis AX direction. The length of each of the via wiring layers 61, 62 in the extension direction is shorter than the length of each of the coil wiring layers 51-53 in the extension direction. The coil wiring layers adjacent in the stacking direction are electrically connected in series via the via wiring layers. In this way, the coil wiring layers 51-53 are electrically connected in series to each other and form a spiral.

[0031] Each of the via wiring layers 61, 62 extends along the spiral direction of the coil 20. This ensures a sufficient contact area between the via wiring layer and the coil wiring layer, improving connection reliability. In addition, since the via wiring layer extends along the spiral direction of the coil, it is possible to eliminate the pad portion at the end of the coil wiring, preventing a decrease in the Q value due to the provision of the pad portion.

[0032] Specifically, the first coil wiring layer 51, the second coil wiring layer 52, and the third coil wiring layer 53 are laminated in this order along the Y direction. An end of the first coil wiring layer 51 is connected to the first external electrode conductor layer 33 of the first external electrode 30. An end of the third coil wiring layer 53 is connected to the second external electrode conductor layer 43 of the second external electrode 40.

[0033] The first via wiring layer 61 is located between the first coil wiring layer 51 and the second coil wiring layer 52, and connects an end of the first coil wiring layer 51 to an end of the second coil wiring layer 52. The second via wiring layer 62 is located between the second coil wiring layer 52 and the third coil wiring layer 53, and connects an end of the second coil wiring layer 52 to an end of the third coil wiring layer 53.

[0034] 4 is a perspective front view of the inductor component as viewed from the first side surface side. As shown in FIG. 4, as viewed from the axis AX direction, the inner diameter of the coil 20 includes a first inner diameter dimension D1 in the length direction (X direction) of the element body 10 and a second inner diameter dimension D2 in the height direction (Z direction) of the element body 10. Either the first inner diameter dimension D1 or the second inner diameter dimension D2 is larger than the other inner diameter dimension, and the ratio of the absolute value of the difference between the one inner diameter dimension and the other inner diameter dimension to the other inner diameter dimension is 0.1% or more and 11% or less. The ratio of the absolute value of the difference between the one inner diameter dimension and the other inner diameter dimension is also referred to as the difference between the ratio between the inner diameter dimensions and 100%.

[0035] The inner diameter of the coil 20 refers to the inner diameter of the coil 20 as viewed from the axis AX direction. When the coil 20 is wound one or more times in a plane perpendicular to the axis AX, the innermost diameter of the coil 20 as viewed from the axis AX direction is referred to as the inner diameter of the coil 20. Also, when viewed from the axis AX direction, when part or all of the coil winding parts 20a overlap, the inner diameter of the coil 20 refers to the innermost diameter of the overlapping coil winding parts 20a.

[0036] The first inner diameter dimension D1 refers to the largest inner diameter dimension of the coil 20 in the length direction as viewed from the axis AX direction. The second inner diameter dimension D2 refers to the largest inner diameter dimension of the coil 20 in the height direction as viewed from the axis AX direction. The first inner diameter dimension D1 and the second inner diameter dimension D2 are measured, for example, by polishing the inductor component 1 along the XZ plane to expose the coil 20, and then measuring the first inner diameter dimension D1 and the second inner diameter dimension D2.

[0037] Specifically, the first inner diameter dimension D1 is larger than the inner diameter dimension of the second inner diameter dimension D2, and the ratio of the absolute value of the difference between the first inner diameter dimension D1 and the second inner diameter dimension D2 to the second inner diameter dimension D2 (hereinafter, simply referred to as the "ratio of difference in inner diameter dimensions") is 0.1% to 11%. The ratio of the difference in inner diameter dimensions is preferably 1% to 8%, and more preferably 4% to 5%. The difference between the first inner diameter dimension D1 and the second inner diameter dimension D2 is 0.15 μm to 1.5 μm. When viewed from the axis AX direction, the first line segment corresponding to the first inner diameter dimension D1 and the second line segment corresponding to the second inner diameter dimension D2 intersect the axis AX, but at least one of the first line segment and the second line segment does not have to intersect the axis AX.

[0038] 4, the length dimension of element body 10 as viewed in the direction of axis AX (hereinafter referred to as length dimension L) is greater than the height dimension of element body 10 as viewed in the direction of axis AX (hereinafter referred to as height dimension T). Length dimension L refers to the maximum length dimension of element body 10 as viewed in the direction of axis AX. Height dimension T refers to the maximum height dimension of element body 10 as viewed in the direction of axis AX.

[0039] Preferably, the length dimension L of element 10 is 0.20 mm or more and 0.30 mm or less. The height dimension T of element 10 is 0.15 mm or more and 0.25 mm or less. More preferably, the length dimension L of element 10 is 0.25 mm and the height dimension T of element 10 is 0.20 mm.

[0040] According to the above configuration, since the ratio of the difference in the inner diameter dimension is 0.1% or more, the inner area of ​​the coil 20 can be increased and the L value can be significantly improved compared to when the shape of the inner peripheral surface of the coil is a perfect circle. Also, since the ratio of the difference in the inner diameter dimension is 11% or less, the line length of the coil 20 can be shortened and the resistance can be reduced compared to when the shape of the inner peripheral surface of the coil is a horizontally long oval or rectangular, and the ratio of the Q value to the L value, that is, the value of the Q value / L value, can be kept at 2.5 or more. Therefore, by making the shape of the inner peripheral surface of the coil 20 closer to a perfect circle, the value of the Q value / L value can be kept at 2.5 or more while ensuring the L value. By keeping the value of the Q value / L value at 2.5 or more, the efficiency of obtaining the Q value can be improved.

[0041] Furthermore, because the first inner diameter dimension D1 is larger than the second inner diameter dimension D2, the shape of the inner circumferential surface of the coil 20 can correspond to the shape of the outer surface of the element body 10 when viewed from the direction of the axis AX in a state in which the length dimension L of the element body 10 is larger than the height dimension T of the element body 10. This allows the space inside the element body 10 for the coil 20 to be used effectively, and the inner area of ​​the coil 20 can be increased, improving the efficiency of obtaining the L value.

[0042] Furthermore, since the first inner diameter dimension D1 is larger than the second inner diameter dimension D2, when the inductor component 1 is mounted on a mounting board with the bottom surface 17 of the element body 10 facing the mounting board, the coil 20 can be separated from the mounting board, thereby reducing the stray capacitance with the mounting board.

[0043] Furthermore, the length dimension L of body 10 is 0.20 mm or more and 0.30 mm or less, and the height dimension T of body 10 is 0.15 mm or more and 0.25 mm or less. Therefore, when viewed from the direction of axis AX, the shape of the outer surface of body 10 is suitable for the shape of the inner surface of coil 20, which has an inner diameter dimension difference ratio of 0.1% or more and 11% or less, and the internal space of body 10 for coil 20 can be used effectively.

[0044] Next, a method for manufacturing the inductor component 1 will be described.

[0045] 3A and 3B, the inductor component 1 is manufactured by alternately stacking the first to third coil wiring layers 51-53 and the first and second via wiring layers 61, 62 together with the insulating layer 11 from top to bottom in the figures. The coil wiring layers 51-53 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 61, 62 are provided in the openings by, for example, screen printing.

[0046] Second embodiment Fig. 5 is a see-through front view of the inductor component according to a second embodiment, seen from a first side surface of the inductor component. Figs. 6A and 6B are exploded plan views of the inductor component. The second embodiment differs from the first embodiment in the shape of the coil. This difference in configuration will be described below. The other configurations are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment will be used, and the description thereof will be omitted.

[0047] 5, 6A, and 6B, in the inductor component 1A of the second embodiment, the shape of the winding portion 20a of the coil 20A is a polygonal ring-shaped body when viewed from the axis AX direction. In other words, the shape of the inner circumferential surface of the coil 20A is a polygon when viewed from the axis AX direction. In this embodiment, the polygon is a substantially rectangular shape.

[0048] When viewed from the direction of axis AX, coil 20A is formed along the outer surface of element body 10, first external electrode 30, and second external electrode 40. That is, coil 20A includes a portion parallel to top surface 18, a portion parallel to first end surface 15, a portion parallel to bottom surface 17, a portion parallel to second end surface 16, a portion parallel to first external electrode 30, and a portion parallel to second external electrode 40.

[0049] The coil 20A has first to third coil wiring layers 51-53 stacked along the axis AX, and first and second via wiring layers 61, 62 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 adjacent coil wiring layers in the stacking direction are electrically connected in series through the via wiring layers. In this way, the multiple coil wiring layers 51-53 form a spiral while being electrically connected in series with each other.

[0050] The number of turns of each of the coil wiring layers 51 to 53 is less than one turn, but may be one or more turns. Each of the coil wiring layers 51 to 53 is composed of straight line portions and curved line portions when viewed from the axis AX direction. The curved line portions are formed by a series of multiple circular arcs.

[0051] The length in the extension direction of each of the via wiring layers 61, 62 is shorter than the length in the extension direction of each of the coil wiring layers 51 to 53. Each of the via wiring layers 61, 62 is composed of a curved portion when viewed from the axis AX direction. The curved portion is formed by a plurality of continuous circular arcs.

[0052] As with the coil 20 of the first embodiment, the first inner diameter dimension D1 is larger than the second inner diameter dimension D2, and the ratio of the absolute value of the difference between the first inner diameter dimension D1 and the second inner diameter dimension D2 to the second inner diameter dimension D2 (the ratio of the difference in the inner diameter dimensions) is 0.1% or more and 11% or less. The ratio of the difference in the inner diameter dimensions is preferably 1% or more and 8% or less, and more preferably 4% or more and 5% or less. The difference between the first inner diameter dimension D1 and the second inner diameter dimension D2 is 0.15 μm or more and 1.5 μm or less.

[0053] As with the element body 10 of the first embodiment, the length dimension L of element body 10 is greater than the height dimension T of element body 10 when viewed in the direction of axis AX. Preferably, the length dimension L of element body 10 is not less than 0.20 mm and not more than 0.30 mm. The height dimension T of element body 10 is not less than 0.15 mm and not more than 0.25 mm. More preferably, the length dimension L of element body 10 is 0.25 mm and the height dimension T of element body 10 is 0.20 mm.

[0054] According to the above configuration, since the ratio of the difference in the inner diameter dimension is 0.1% or more, the inner area of ​​the coil 20A can be increased and the L value can be significantly improved compared to when the shape of the inner peripheral surface of the coil is a perfect circle. Also, since the ratio of the difference in the inner diameter dimension is 11% or less, the line length of the coil 20A can be shortened and the resistance can be reduced, and the value of the Q value / L value can be kept at 2.5 or more, compared to when the shape of the inner peripheral surface of the coil is a horizontally long oval or a rectangle. Therefore, by making the shape of the inner peripheral surface of the coil 20A closer to a square, the value of the Q value / L value can be kept at 2.5 or more while ensuring the L value. By keeping the value of the Q value / L value at 2.5 or more, the efficiency of obtaining the Q value can be improved.

[0055] Furthermore, because the first inner diameter dimension D1 is larger than the second inner diameter dimension D2, the shape of the inner circumferential surface of coil 20A can be made to correspond to the shape of the outer surface of element body 10 when viewed from the direction of axis AX in a state in which the length dimension L of element body 10 is larger than the height dimension T of element body 10. This allows the space inside element body 10 for coil 20A to be used effectively, the inner area of ​​coil 20A can be increased, and the efficiency of obtaining the L value can be improved.

[0056] Furthermore, since the first inner diameter dimension D1 is larger than the second inner diameter dimension D2, when the inductor component 1A is mounted on a mounting board with the bottom surface 17 of the element body 10 facing the mounting board, the coil 20A can be separated from the mounting board, thereby reducing the stray capacitance with the mounting board.

[0057] Furthermore, the length dimension L of body 10 is 0.20 mm or more and 0.30 mm or less, and the height dimension T of body 10 is 0.15 mm or more and 0.25 mm or less. Therefore, when viewed from the direction of axis AX, the shape of the outer surface of body 10 is suitable for the shape of the inner surface of coil 20A, whose inner diameter dimension difference ratio is 0.1% or more and 11% or less, and the internal space of body 10 can be used effectively for coil 20A.

[0058] Third embodiment Fig. 7 is a see-through front view of the inductor component according to a third embodiment, seen from a first side surface of the inductor component. Figs. 8A, 8B, and 8C are exploded plan views of the inductor component. The third embodiment differs from the first embodiment in the shape of the coil. This difference in configuration will be described below. The other configurations are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment will be used, and the description thereof will be omitted.

[0059] 7, 8A, 8B, and 8C, in an inductor component 1B according to the third embodiment, the shape of a winding portion 20a of a coil 20B is a polygonal ring-shaped body when viewed from the axis AX direction. That is, the shape of the inner peripheral surface of the coil 20B is a polygon when viewed from the axis AX direction. In this embodiment, the polygon is a substantially rectangular shape.

[0060] When viewed from the direction of axis AX, coil 20B is formed along the outer surface of element body 10, first external electrode 30, and second external electrode 40. In other words, coil 20B includes a portion parallel to top surface 18, a portion parallel to first end surface 15, a portion parallel to bottom surface 17, a portion parallel to second end surface 16, a portion parallel to first external electrode 30, and a portion parallel to second external electrode 40.

[0061] The coil 20B has first to fourth coil wiring layers 51-54 stacked along the axis AX, and first to third via wiring layers 61-63 located between adjacent coil wiring layers in the axis AX direction and connecting the adjacent coil wiring layers in the axis AX direction. The adjacent coil wiring layers in the stacking direction are electrically connected in series through the via wiring layers. In this way, the multiple coil wiring layers 51-54 form a spiral while being electrically connected in series with each other.

[0062] The number of turns of each of the coil wiring layers 51-54 is less than one turn, but may be one or more turns. When viewed from the axis AX direction, each of the coil wiring layers 51-54 is composed of straight line portions and curved line portions. The curved line portions are formed by a series of multiple circular arcs.

[0063] The length in the extending direction of each of the via wiring layers 61 to 63 is shorter than the length in the extending direction of each of the coil wiring layers 51 to 54. Each of the via wiring layers 61 to 63 is composed of a curved portion when viewed from the axis AX direction. The curved portion is formed by a circular arc.

[0064] The second inner diameter dimension D2 is larger than the first inner diameter dimension D1, and the ratio of the absolute value of the difference between the first inner diameter dimension D1 and the second inner diameter dimension D2 to the first inner diameter dimension D1 (the ratio of the difference in the inner diameter dimensions) is 0.1% or more and 11% or less. The ratio of the difference in the inner diameter dimensions is preferably 1% or more and 8% or less, and more preferably 4% or more and 5% or less. The difference between the first inner diameter dimension D1 and the second inner diameter dimension D2 is 0.15 μm or more and 1.5 μm or less.

[0065] As with the element body 10 of the first embodiment, the length dimension L of element body 10 is greater than the height dimension T of element body 10 when viewed in the direction of axis AX. Preferably, the length dimension L of element body 10 is not less than 0.20 mm and not more than 0.30 mm. The height dimension T of element body 10 is not less than 0.15 mm and not more than 0.25 mm. More preferably, the length dimension L of element body 10 is 0.25 mm and the height dimension T of element body 10 is 0.20 mm.

[0066] According to the above configuration, since the ratio of the difference in the inner diameter dimension is 0.1% or more, the inner area of ​​the coil 20B can be increased and the L value can be significantly improved compared to when the shape of the inner peripheral surface of the coil is a perfect circle. Also, since the ratio of the difference in the inner diameter dimension is 11% or less, the line length of the coil 20B can be shortened and the resistance can be reduced, and the value of the Q value / L value can be kept at 2.5 or more, compared to when the shape of the inner peripheral surface of the coil is a vertically long oval or rectangular. Therefore, by making the shape of the inner peripheral surface of the coil 20B closer to a square, the value of the Q value / L value can be kept at 2.5 or more while ensuring the L value. By keeping the value of the Q value / L value at 2.5 or more, the efficiency of obtaining the Q value can be improved.

[0067] Furthermore, since the second inner diameter dimension D2 is larger than the first inner diameter dimension D1, when the first external electrode 30 is L-shaped and provided on the bottom surface 17 and the first end surface 15, and the second external electrode 40 is L-shaped and provided on the bottom surface 17 and the second end surface 16, the coil 20B can be separated from the first external electrode 30 and the second external electrode 40, and the stray capacitance with the first external electrode 30 and the second external electrode 40 can be reduced.

[0068] Furthermore, the length dimension L of body 10 is 0.20 mm or more and 0.30 mm or less, and the height dimension T of body 10 is 0.15 mm or more and 0.25 mm or less. Therefore, when viewed from the direction of axis AX, the shape of the outer surface of body 10 is suitable for the shape of the inner surface of coil 20B, whose inner diameter dimension difference ratio is 0.1% or more and 11% or less, and the internal space of body 10 can be used effectively for coil 20B.

[0069] (Other embodiments) The present disclosure is not limited to the above-described embodiments, and design changes are possible without departing from the scope of the present disclosure. For example, the features of the first to third embodiments may be combined in various ways. For example, the number of coil wiring layers may be increased or decreased, and the number of via wiring layers may be increased or decreased.

[0070] The element body may have a length dimension smaller than a height dimension. The winding portion of the coil may be formed in a spiral shape when viewed from the axial direction. The first external electrode and the second external electrode may be provided only on the bottom surface of the element body.

[0071] In addition, the ends of the coil wiring layers may have pads, and adjacent coil wiring layers may be connected by columnar via layers. The diameter of the pads is greater than the line width of the intermediate portion of the coil wiring layers.

[0072] (Example) Next, examples of the inductor component 1 according to the first embodiment will be described.

[0073] FIG. 9A is a graph showing the relationship between the ratio of difference between the inner diameter dimensions and the Q value acquisition efficiency. In FIG. 9A, the horizontal axis shows the first inner diameter dimension D1 / the second inner diameter dimension D2, which is the ratio between the inner diameter dimensions, and the vertical axis shows the Q value / L value, which is the Q value acquisition efficiency. FIG. 9B is a graph showing the relationship between the ratio of difference between the inner diameter dimensions and the L value. In FIG. 9B, the horizontal axis shows the first inner diameter dimension D1 / the second inner diameter dimension D2, and the vertical axis shows the L value [nH]. FIG. 9C is a graph showing the relationship between the ratio of difference between the inner diameter dimensions and the Q value. In FIG. 9C, the horizontal axis shows the first inner diameter dimension D1 / the second inner diameter dimension D2, and the vertical axis shows the Q value [nH]. In FIG. 9A, FIG. 9B, and FIG. 9C, the values ​​when the first inner diameter dimension D1 is changed while the second inner diameter dimension D2 is constant are shown. The second inner diameter dimension D2 is, for example, 159 μm.

[0074] As shown in Fig. 9A, the ratio of the Q value to the L value increased as the ratio of the difference in the inner diameter dimensions increased, i.e., the first inner diameter dimension D1 increased. As shown in Fig. 9B, the ratio of the L value increased as the ratio of the difference in the inner diameter dimensions increased, i.e., the first inner diameter dimension D1 increased. As shown in Fig. 9C, the Q value increased as the ratio of the difference in the inner diameter dimensions increased, i.e., the first inner diameter dimension D1 increased. Therefore, when the ratio of the difference in the inner diameter dimension is 0.1% or more and 11% or less, the ratio of Q value / L value can be kept at 2.5 or more while ensuring the L value. By keeping the Q value / L value at 2.5 or more, the efficiency of obtaining the Q value can be improved.

[0075] In the above embodiment, the ratio of first inner diameter dimension D1 / second inner diameter dimension D2 was used on the horizontal axis, but similar results can be obtained when the ratio of second inner diameter dimension D2 / first inner diameter dimension D1 is 1.01 or more, i.e., when the second inner diameter dimension D2 is larger than the first inner diameter dimension D1.

[0076] The present disclosure includes the following aspects. <1> The body and a coil provided within the element body and wound helically 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 opposing each other, a first side face and a second side face opposing 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 opposing the bottom face, the first external electrode and the second external electrode are provided on at least the bottom surface, the axis is parallel to the bottom surface and intersects the first side surface and the second side surface; When viewed in the axial direction, the inner diameter of the coil includes a first inner diameter dimension in a length direction where the first end surface and the second end surface face each other, and a second inner diameter dimension in a height direction where the top surface and the bottom surface face each other, An inductor component, wherein one of the first inner diameter dimension and the second inner diameter dimension is larger than the other inner diameter dimension, and the absolute value of the difference between the one inner diameter dimension and the other inner diameter dimension relative to the other inner diameter dimension is greater than or equal to 0.1% and less than or equal to 11%. <2> The one inner diameter dimension is the first inner diameter dimension, and the other inner diameter dimension is the second inner diameter dimension. <1> 2. An inductor component according to claim 1 . <3> When viewed in the axial direction, the dimension of the element body in the length direction is greater than the dimension of the element body in the height direction. <2> 2. An inductor component according to claim 1 . <4> The one inner diameter dimension is the second inner diameter dimension, and the other inner diameter dimension is the first inner diameter dimension. <1> 2. An inductor component according to claim 1 . <5> the first external electrode is provided on the bottom surface and the first end surface, The second external electrode is provided on the bottom surface and the second end surface. <4> 2. An inductor component according to claim 1 . <6> When viewed from the axial direction, the length dimension of the element body is greater than the height dimension of the element body, the length dimension of the element body is not less than 0.20 mm and not more than 0.30 mm, and the height dimension of the element body is not less than 0.15 mm and not more than 0.25 mm. <1> from <5> 13. An inductor component according to any one of the above. [Explanation of symbols]

[0077] 1, 1A, 1B 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, 20B coil 20a Winding section 20b 1st drawer 20c 2nd drawer 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 51-54 1st to 4th coil wiring layers 61-63 1st to 3rd via wiring layers AX axis D1 First inner diameter D2 Second inner diameter L Length dimension T Height dimension

Claims

1. The body and a coil provided within the element body and wound helically 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 opposing each other, a first side face and a second side face opposing 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 opposing the bottom face, the first external electrode and the second external electrode are provided on at least the bottom surface, the axis is parallel to the bottom surface and intersects the first side surface and the second side surface; When viewed in the axial direction, the inner diameter of the coil includes a first inner diameter dimension in a length direction where the first end surface and the second end surface face each other, and a second inner diameter dimension in a height direction where the top surface and the bottom surface face each other, An inductor component, wherein one of the first inner diameter dimension and the second inner diameter dimension is larger than the other inner diameter dimension, and the absolute value of the difference between the one inner diameter dimension and the other inner diameter dimension relative to the other inner diameter dimension is greater than or equal to 0.1% and less than or equal to 11%.

2. The inductor component according to claim 1 , wherein the one inner diameter dimension is the first inner diameter dimension and the other inner diameter dimension is the second inner diameter dimension.

3. 3. The inductor component according to claim 2, wherein the lengthwise dimension of the element body is greater than the heightwise dimension of the element body when viewed in the axial direction.

4. The inductor component according to claim 1 , wherein the one inner diameter dimension is the second inner diameter dimension and the other inner diameter dimension is the first inner diameter dimension.

5. the first external electrode is provided on the bottom surface and the first end surface, The inductor component according to claim 4 , wherein the second external electrode is provided on the bottom surface and the second end surface.

6. An inductor component as described in any one of claims 1 to 5, wherein, when viewed in the axial direction, the longitudinal dimension of the element body is greater than the height dimension of the element body, the longitudinal dimension of the element body is greater than or equal to 0.20 mm and less than or equal to 0.30 mm, and the height dimension of the element body is greater than or equal to 0.15 mm and less than or equal to 0.25 mm.

Images