Inductor component

Abstract

The invention provides an inductor component capable of ensuring an L value and suppressing reduction of a ratio of a Q value to the L value. The inductor component is provided with: a green body; a coil disposed in the body and wound into a spiral shape along an axis; and a first external electrode and a second external electrode provided on the body and electrically connected to the coil, the body including a first end surface, a second end surface, a first side surface, a second side surface, a bottom surface, and a top surface, the first external electrode and the second external electrode being provided at least on the bottom surface, the axis being parallel to the bottom surface and intersecting the first side surface and the second side surface, and the first external electrode and the second external electrode being electrically connected to the coil when viewed from the axial direction. The inner diameter of the coil includes a first inner diameter dimension in the length direction in which the first end face and the second end face face each other and a second inner diameter dimension in the height direction in which the top face and the bottom face face each other, and either the first inner diameter dimension or the second inner diameter dimension is larger than the other inner diameter dimension. 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.

Description

Technical Field

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

[0002] In the past, as an inductor component, there is a component described in Japanese Patent Publication No. 2013-153009 (Patent Document 1). The inductor component has a blank, a coil disposed in the blank and wound in a spiral shape along an axis, and a first external electrode and a second external electrode disposed in the blank and electrically connected to the coil. When viewed from the axial direction, the shape of the inner circumference of the coil is a roughly rectangular shape that is long in the horizontal direction along the outer surface of the blank, the first external electrode, and the vicinity of the second external electrode.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2013-153009

[0004] However, in the above-mentioned conventional inductor components, since the inner peripheral surface of the coil is in the shape of a horizontally long rectangle, there is a problem that the line length of the coil becomes longer, and therefore there is a concern that the resistance of the coil increases and the ratio of the Q value to the L value decreases. Summary of the invention

[0005] Therefore, an object of the present disclosure is to provide an inductor component capable of ensuring an L value and suppressing a decrease in the ratio of the Q value to the L value.

[0006] In order to solve the above-mentioned problems, an inductor component according to one embodiment of the present disclosure includes:

[0007] green body;

[0008] A coil is disposed in the blank and is wound in a spiral shape along the axis; and

[0009] The first external electrode and the second external electrode are arranged on the above-mentioned body and are electrically connected to the above-mentioned coil.

[0010] The blank comprises: a first end face and a second end face opposite to each other, a first side face and a second side face opposite to 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 opposite to the bottom face.

[0011] The first external electrode and the second external electrode are at least arranged on the bottom surface.

[0012] The axis is parallel to the bottom surface, and the axis intersects the first side surface and the second side surface.

[0013] When viewed from the axial direction, the inner diameter of the coil includes a first inner diameter dimension and a second inner diameter dimension, wherein the first inner diameter dimension is a dimension in a length direction opposite to the first end face and the second end face, and the second inner diameter dimension is a dimension in a height direction opposite to the top face and the bottom face.

[0014] One of the first inner diameter dimension and the second inner diameter dimension is larger than the other inner diameter dimension, and a ratio of an absolute value of a 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.

[0015] Here, the so-called inner diameter of the coil refers to the diameter of the inner side of the coil when observed from the axial direction. When the coil is wound more than one circle on a plane perpendicular to the axis, the innermost diameter of the coil when observed from the axial direction is called the inner diameter of the coil. In addition, when part or all of the coil windings overlap when viewed from the axial perspective, the inner diameter of the coil refers to the innermost diameter of the overlapping coil windings. The so-called first inner diameter dimension refers to the dimension of the largest inner diameter among the inner diameters of the coil in the length direction when observed from the axial direction. The so-called second inner diameter dimension refers to the dimension of the largest inner diameter among the inner diameters of the coil in the height direction when observed from the axial direction.

[0016] According to the above method, since the ratio of the difference in the inner diameter dimensions, in other words, the difference in the ratio between the inner diameter dimensions is greater than 0.1%, the area of ​​the inner side of the coil can be increased compared to the case where the shape of the inner circumference of the coil is a perfect circle, and the L value can be ensured. Since the ratio of the difference in the inner diameter dimensions is less than 11%, the line length of the coil can be shortened to reduce the resistance, and the ratio of the Q value to the L value, that is, the value of the Q value / L value can be maintained at more than 2.5, compared to the case where the shape of the inner circumference of the coil is an ellipse or a rectangle that is long horizontally or vertically. Therefore, by making the shape of the inner circumference of the coil close to a perfect circle or a square, the L value can be ensured and the value of the Q value / L value can be maintained at more than 2.5. By maintaining the value of the Q value / L value at more than 2.5, the efficiency of obtaining the Q value can be improved.

[0017] According to the inductor component of one embodiment of the present disclosure, it is possible to ensure the L value and suppress a decrease in the ratio of the Q value to the L value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective view showing a first embodiment of the inductor component.

[0019] Figure 2 This is a perspective front view of the inductor component as seen from the first side surface.

[0020] Figure 3A It is an exploded top view of the inductor components.

[0021] Figure 3B It is an exploded top view of the inductor components.

[0022] Figure 4 This is a perspective front view of the inductor component as seen from the first side surface.

[0023] Figure 5 A second embodiment of the inductor component is shown, and is a perspective front view of the inductor component as seen from the first side surface.

[0024] Fig. 6A It is an exploded top view of the inductor components.

[0025] Figure 6B It is an exploded top view of the inductor components.

[0026] Figure 7 A third embodiment of the inductor component is shown, and is a perspective front view of the inductor component as seen from the first side surface.

[0027] Fig. 8A It is an exploded top view of the inductor components.

[0028] Figure 8B It is an exploded top view of the inductor components.

[0029] Figure 8C It is an exploded top view of the inductor components.

[0030] Fig. 9A This is an example of a graph showing the relationship between the ratio between the inner diameter dimensions and the ratio of the Q value to the L value.

[0031] Fig. 9B This is a graph showing the relationship between the ratio between the inner diameter dimensions and the L value.

[0032] Fig. 9C This is a graph showing the relationship between the ratio between the inner diameter dimensions and the Q value.

[0033] Description of Reference Numerals

[0034] 1, 1A, 1B…inductor component, 10…body, 11…insulating layer, 13…first side surface, 14…second side surface, 15…first end surface, 16…second end surface, 17…bottom surface, 18…top surface, 20, 20A, 20B…coil, 20a…winding portion, 20b…first lead portion, 20c…second lead portion, 30…first external electrode, 31…first end surface portion, 32…first bottom surface portion, 33…first external electrode conductor layer, 40…second external electrode, 41…second end surface portion, 42…second bottom surface portion, 43…second external electrode conductor layer, 51-54…first coil wiring layer to fourth coil wiring layer, 61-63…first conduction wiring layer to third conduction wiring layer, AX…axis, D1…first inner diameter dimension, D2…second inner diameter dimension, L…length dimension, T…height dimension. DETAILED DESCRIPTION

[0035] Hereinafter, an inductor component as one embodiment of the present disclosure will be described in detail by way of the illustrated embodiments. Note that the drawings include some schematic drawings and may not reflect actual dimensions or ratios.

[0036] (First Embodiment)

[0037] Figure 1 It is a perspective view showing a first embodiment of the inductor component. Figure 2 This is a perspective front view of the inductor component as seen from the first side surface. Figure 3A and Figure 3B is an exploded top view of the inductor components. Figure 1 , Figure 2 , Figure 3A as well as Figure 3B As shown, the inductor component 1 comprises a body 10, a coil 20, and a first external electrode 30 and a second external electrode 40, wherein the coil 20 is disposed in the body 10 and is wound in a spiral shape along the axis AX, and the first external electrode 30 and the second external electrode 40 are disposed in the body 10 and are electrically connected to the coil 20. Figure 2 In the diagram, the blank and the coil are depicted transparently so that the structure can be easily understood, but they may also be semi-transparent or opaque.

[0038] The inductor component 1 is electrically connected to wiring of a circuit substrate (not shown) via the first external electrode 30 and the second external electrode 40. The inductor component 1 is used, for example, as an impedance matching coil (matching coil) for a high-frequency circuit, and is used in electronic devices such as personal computers, DVD players, digital cameras, TVs, mobile phones, automotive electronic equipment, and medical / industrial equipment. However, the use of the inductor component 1 is not limited thereto, and it can also be used, for example, in a tuning circuit, a filter circuit, a rectifier smoothing circuit, etc.

[0039] The green body 10 is formed in a substantially rectangular parallelepiped shape. The surface of the green body 10 includes a first end face 15 and a second end face 16 facing each other, a first side face 13 and a second side face 14 facing each other, a bottom face 17 connecting 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 facing the bottom face 17. The bottom face 17 is a face facing the mounting substrate side when the inductor component 1 is mounted on a mounting substrate (not shown).

[0040] As shown in the figure, the X direction is a direction perpendicular to the first end surface 15 and the second end surface 16, and is a direction from the first end surface 15 to the second end surface 16. The Y direction is a direction perpendicular to the first side surface 13 and the second side surface 14, and is a direction from the second side surface 14 to the first side surface 13. The Z direction is a direction perpendicular to the bottom surface 17 and the top surface 18, and is a direction from the bottom surface 17 to the top surface 18. The X direction, the Y direction, and the Z direction are mutually perpendicular directions, and when X, Y, and Z are arranged in sequence, a left-hand system is formed.

[0041] The X direction is also referred to as the length direction of the blank 10, the Y direction is also referred to as the width direction of the blank 10, and the Z direction is also referred to as the height direction of the blank 10. The so-called length direction refers to the direction in which the first end face 15 and the second end face 16 are opposite to 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 so-called width direction refers to the direction in which the first side face 13 and the second side face 14 are opposite to 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 so-called height direction refers to the direction in which the top face 18 and the bottom face 17 are opposite to 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.

[0042] The blank 10 is formed by stacking a plurality of insulating layers 11. The insulating layer 11 is composed of, for example, a material having borosilicate glass as a main component, ferrite, resin, and other materials. The stacking direction of the insulating layer 11 is a direction (Y direction) parallel to the first end face 15, the second end face 16, and the bottom face 17 of the blank 10. That is, the insulating layer 11 is a layer extending in the XZ plane. The "parallel" in the present application is not limited to a precise parallel relationship, and also includes a substantially parallel relationship in consideration of the range of actual deviations. In addition, there is a case where the interfaces between the plurality of insulating layers 11 of the blank 10 become unclear due to firing, etc. In addition, in Figure 3A and Figure 3B In the figure, the direction from top to bottom is regarded as the stacking direction (Y direction).

[0043] 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 them as a main component. The first external electrode 30 is continuously provided on the bottom surface 17 and the first end surface 15. The shape of the first external electrode 30 is L-shaped. The first external electrode 30 is embedded in the 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 and a first bottom surface portion 32, wherein the first end surface portion 31 extends along the first end surface 15, and the first bottom surface portion 32 is connected to the first end surface portion 31 and extends along the bottom surface 17.

[0044] A second external electrode 40 is continuously provided on the bottom surface 17 and the second end surface 16. The second external electrode 40 is in an L-shape. The second external electrode 40 is embedded in the 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, wherein the second end surface portion 41 extends along the second end surface 16, and the second bottom surface portion 42 is connected to the second end surface portion 41 and extends along the bottom surface 17.

[0045] The first external electrode 30 has a structure in which a plurality of first external electrode conductor layers 33 are stacked and buried in the base body 10 (insulating layer 11). The second external electrode 40 has a structure in which a plurality of second external electrode conductor layers 43 are stacked and buried in the base body 10 (insulating layer 11). The first external electrode conductor layer 33 extends along the first end surface 15 and the bottom surface 17, and the second external electrode conductor layer 43 extends along the second end surface 16 and the bottom surface 17.

[0046] Thus, since the first external electrode 30 and the second external electrode 40 can be embedded in the green body 10, the inductor component can be miniaturized compared to a structure in which the external electrodes are provided outside the green body 10. In addition, the coil 20 and the external electrodes 30 and 40 can be formed in the same process, and the variation in the positional relationship between the coil 20 and the external electrodes 30 and 40 can be reduced, thereby reducing the variation in the electrical characteristics of the inductor component 1.

[0047] Furthermore, the first external electrode 30 may not have the first end surface portion 31 but may be composed of the first bottom surface portion 32. Similarly, the second external electrode 40 may not have the second end surface portion 41 but may be composed of the second bottom surface portion 42. In other words, the first external electrode 30 and the second external electrode 40 may be provided at least on the bottom surface 17 of the body 10.

[0048] The coil 20 is made of, for example, the same conductive material as the first external electrode 30 and the second external electrode 40. The coil 20 is wound in a spiral shape along the stacking direction of the insulating layer 11. The first end of the coil 20 is connected to the first external electrode 30, and the second end of the coil 20 is connected to the second external electrode 40. In addition, in the present embodiment, the coil 20 is integrated with the first external electrode 30 and the second external electrode 40, and there is no clear boundary, but it is not limited to this, and the coil and the external electrode may be formed by different types of materials and different types of processes, so that there is a boundary.

[0049] 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 stacking direction (Y direction) of the insulating layer 11. The axis AX of the coil 20 refers to the central axis of the spiral shape of the coil 20.

[0050] The coil 20 includes a winding portion 20a, a first lead portion 20b, and a second lead portion 20c, wherein the first lead portion 20b is connected between the first end of the winding portion 20a and the first external electrode 30, and the second lead portion 20c is connected between the second end of the winding portion 20a and the second external electrode 40. In the present embodiment, the winding portion 20a is integrated with the first lead portion 20b and the second lead portion 20c without a clear boundary, but the present invention is not limited thereto, and the winding portion and the lead portion may be formed by different types of materials and different types of processes, so that there is a boundary.

[0051] The winding portion 20a is wound in a spiral shape along the axis AX. That is, the winding portion 20a refers to the portion of the coils 20 wound in a spiral shape that overlaps each other when viewed from a direction parallel to the axis AX. The first lead portion 20b and the second lead portion 20c refer to the portions that are separated from the overlapping portions.

[0052] When viewed from the axis AX direction of the coil 20, the shape of the coil 20 is a shape that is bilaterally symmetrical with respect to a straight line passing through the axis AX of the coil 20 and parallel to the Z direction. Thus, it is possible to suppress the deviation of the characteristics of the inductor component 1. Specifically, when viewed from the axis AX direction, the shape of the winding portion 20a of the coil 20 is a circular annular body. When viewed from the axis AX direction, the shape of the inner circumference of the coil 20 is circular.

[0053] like Figure 3A and Figure 3BAs shown, the coil 20 has a plurality of coil wiring layers 51 to 53 stacked along the axis AX and a plurality of conductive wiring layers 61 and 62 located between and connecting the coil wiring layers adjacent to each other in the axis AX direction. The plurality of coil wiring layers 51 to 53 are respectively provided on the insulating layer 11, and the plurality of conductive wiring layers 61 and 62 are respectively provided on the insulating layer 11. When viewed from the axis AX direction, the plurality of coil wiring layers 51 to 53 and the plurality of conductive wiring layers 61 and 62 extend along the spiral direction of the coil 20.

[0054] The plurality of coil wiring layers 51 to 53 are respectively wound along a plane, electrically connected in series and form a spiral. The plurality of coil wiring layers 51 to 53 are wound on the main surface (XZ plane) of the insulating layer 11 orthogonal to the axial AX direction (Y direction). The number of windings of each coil wiring layer 51 to 53 is less than one turn, but can also be more than one turn. When viewed from the axial AX direction, the plurality of coil wiring layers 51 to 53 each have an arc shape.

[0055] The plurality of conductive wiring layers 61 and 62 penetrate the insulating layer 11 in the thickness direction (Y direction). When viewed from the axis AX direction, the plurality of conductive wiring layers 61 and 62 each have an arc shape. The length of each conductive wiring layer 61 and 62 in the extension direction is shorter than the length of each coil wiring layer 51 to 53 in the extension direction. Moreover, the coil wiring layers adjacent to each other in the stacking direction are electrically connected in series via the conductive wiring layers. In this way, the plurality of coil wiring layers 51 to 53 are electrically connected in series with each other and form a spiral.

[0056] Each conductive wiring layer 61, 62 extends along the spiral direction of the coil 20. Thus, the contact area between the conductive wiring layer and the coil wiring layer can be ensured, and the connection reliability can be improved. In addition, since the conductive wiring layer extends along the spiral direction of the coil, the pad portion at the end of the coil wiring can be eliminated, and the reduction of the Q value caused by the provision of the pad portion can be prevented.

[0057] Specifically, a first coil wiring layer 51, a second coil wiring layer 52, and a third coil wiring layer 53 are sequentially stacked 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.

[0058] The first conductive wiring layer 61 is located between the first coil wiring layer 51 and the second coil wiring layer 52, and connects the end of the first coil wiring layer 51 with the end of the second coil wiring layer 52. The second conductive wiring layer 62 is located between the second coil wiring layer 52 and the third coil wiring layer 53, and connects the end of the second coil wiring layer 52 with the end of the third coil wiring layer 53.

[0059] Figure 4 is a perspective front view of the inductor component as viewed from the first side surface. Figure 4 As shown, when 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 blank 10 and a second inner diameter dimension D2 in the height direction (Z direction) of the blank 10. Any one of the first inner diameter dimension D1 and the second inner diameter dimension D2 is larger than the other inner diameter dimension, and the absolute value of the difference between one inner diameter dimension and the other inner diameter dimension is greater than 0.1% and less than 11% relative to the other inner diameter dimension. In addition, the ratio of the absolute value of the difference between 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%.

[0060] The so-called inner diameter of the coil 20 refers to the inner diameter of the coil 20 when viewed from the axis AX direction. When the coil 20 is wound one or more times on a plane perpendicular to the axis AX, the innermost diameter of the coil 20 when viewed from the axis AX direction is referred to as the inner diameter of the coil 20. In addition, when partially or completely overlapping the coil winding portion 20a when viewed from the axis AX direction, the inner diameter of the coil 20 refers to the innermost diameter of the overlapping coil winding portion 20a.

[0061] The first inner diameter dimension D1 refers to the maximum inner diameter dimension of the inner diameter of the coil 20 in the length direction when viewed from the axis AX direction. The second inner diameter dimension D2 refers to the maximum inner diameter dimension of the inner diameter of the coil 20 in the height direction when viewed from the axis AX direction. The first inner diameter dimension D1 and the second inner diameter dimension D2 are measured by, for example, grinding the inductor component 1 along the XZ plane to expose the coil 20, and measuring the first inner diameter dimension D1 and the second inner diameter dimension D2.

[0062] 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, also simply referred to as "the ratio of the difference in inner diameter dimensions") is greater than 0.1% and less than 11%. The ratio of the difference in inner diameter dimensions is preferably greater than 1% and less than 8%, and more preferably greater than 4% and less than 5%. The difference between the first inner diameter dimension D1 and the second inner diameter dimension D2 is greater than 0.15μm and less than 1.5μm. When viewed from the direction of the axis AX, 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 may not intersect the axis AX.

[0063] like Figure 4As shown, when viewed from the axis AX direction, the dimension of the blank 10 in the length direction (hereinafter referred to as the length dimension L) is larger than the dimension of the blank 10 in the height direction (hereinafter referred to as the height dimension T). The so-called length dimension L refers to the maximum dimension of the blank 10 in the length direction when viewed from the axis AX direction. The so-called height dimension T refers to the maximum dimension of the blank 10 in the height direction when viewed from the axis AX direction.

[0064] The length L of the blank 10 is preferably 0.20 mm or more and 0.30 mm or less. The height T of the blank 10 is preferably 0.15 mm or more and 0.25 mm or less. More preferably, the length L of the blank 10 is 0.25 mm, and the height T of the blank 10 is 0.20 mm.

[0065] According to the above structure, since the ratio of the difference in the inner diameter size is 0.1% or more, the area of ​​the inner side of the coil 20 can be increased compared to the case where the shape of the inner circumference of the coil is a perfect circle, and the L value can be significantly improved. In addition, since the ratio of the difference in the inner diameter size is less than 11%, the line length of the coil 20 can be shortened to reduce the resistance, and the ratio of the Q value to the L value, that is, the value of the Q value / L value can be maintained at more than 2.5, compared to the case where the shape of the inner circumference of the coil is a horizontally long ellipse or rectangle. Therefore, by making the shape of the inner circumference of the coil 20 close to a perfect circle, the L value can be ensured and the value of the Q value / L value can be maintained at more than 2.5. By maintaining the value of the Q value / L value at more than 2.5, the efficiency of obtaining the Q value can be improved.

[0066] In addition, since the first inner diameter dimension D1 is larger than the second inner diameter dimension D2, when the length dimension L of the blank 10 is larger than the height dimension T of the blank 10, when viewed from the axis AX direction, the shape of the inner circumferential surface of the coil 20 can correspond to the shape of the outer surface of the blank 10. As a result, the space inside the blank 10 can be effectively used for the coil 20, the area inside the coil 20 can be increased, and the efficiency of obtaining the L value can be improved.

[0067] Furthermore, since the first inner diameter D1 is larger than the second inner diameter D2, when the inductor component 1 is mounted on a mounting substrate with the bottom surface 17 of the base body 10 facing the mounting substrate, the coil 20 can be separated from the mounting substrate, thereby reducing stray capacitance with the mounting substrate.

[0068] In addition, since the length dimension L of the blank 10 is greater than 0.20 mm and less than 0.30 mm, and the height dimension T of the blank 10 is greater than 0.15 mm and less than 0.25 mm, when observed from the axis AX direction, the shape of the outer surface of the blank 10 is suitable for the shape of the inner circumferential surface of the coil 20, in which the ratio of the difference in the inner diameter size is greater than 0.1% and less than 11%, so that the space inside the blank 10 can be effectively used for the coil 20.

[0069] Next, a method for manufacturing the inductor component 1 will be described.

[0070] like Figure 3A and Figure 3B As shown in the figure, the inductor component 1 is manufactured by alternately stacking the first coil wiring layer 51 to the third coil wiring layer 53 and the first conductive wiring layer 61 and the second conductive wiring layer 62 from top to bottom together with the insulating layer 11. In addition, the coil wiring layers 51 to 53 are provided on the insulating layer 11, for example, by screen printing. For example, an opening is provided in the insulating layer 11 by a photolithography process or a laser process, and the conductive wiring layers 61 and 62 are provided in the opening by screen printing, for example.

[0071] (Second Embodiment)

[0072] Figure 5 A second embodiment of the inductor component is shown, and is a perspective front view of the inductor component as seen from the first side surface. Fig. 6A and Figure 6B : is an exploded top view of the inductor component. The shape of the coil of the second embodiment is different from that of the first embodiment. The following describes the different structure. The other structures are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are marked and their descriptions are omitted.

[0073] like Figure 5 , Fig. 6A as well as Figure 6B As shown, in the inductor component 1A of the second embodiment, the winding portion 20a of the coil 20A is a polygonal ring when viewed from the axis AX direction. That is, the inner peripheral surface of the coil 20A is a polygon when viewed from the axis AX direction. In this embodiment, the polygon is a substantially quadrilateral.

[0074] When viewed from the axis AX direction, the coil 20A is formed along the outer surface of the body 10, the first external electrode 30, and the second external electrode 40. That is, the coil 20A includes a portion parallel to the top surface 18, a portion parallel to the first end surface 15, a portion parallel to the bottom surface 17, a portion parallel to the second end surface 16, a portion parallel to the first external electrode 30, and a portion parallel to the second external electrode 40.

[0075] The coil 20A has a first coil wiring layer 51 to a third coil wiring layer 53 stacked along the axis AX, and a first conductive wiring layer 61 and a second conductive wiring layer 62 located between adjacent coil wiring layers in the direction of the axis AX and connecting adjacent coil wiring layers in the direction of the axis AX. Moreover, the adjacent coil wiring layers in the stacking direction are electrically connected in series via the conductive wiring layers. In this way, a plurality of coil wiring layers 51 to 53 are electrically connected in series to form a spiral.

[0076] The number of turns of each coil wiring layer 51 to 53 is less than one turn, but may be more than one turn. When viewed from the axis AX direction, each coil wiring layer 51 to 53 is composed of a straight line portion and a curved line portion. The curved line portion is formed by a plurality of continuous arcs.

[0077] The length of each conducting wiring layer 61, 62 in the extending direction is shorter than the length of each coil wiring layer 51 to 53. When viewed from the axis AX direction, each conducting wiring layer 61, 62 is composed of a curved portion. The curved portion is formed of a plurality of continuous arcs.

[0078] Similar to the coil 20 of the first embodiment, 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 (ratio of the difference in inner diameter dimensions) is 0.1% or more and 11% or less. Preferably, the ratio of the difference in inner diameter dimensions is 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.

[0079] As with the blank 10 of the first embodiment, when viewed from the axis AX direction, the length dimension L of the blank 10 is larger than the height dimension T of the blank 10. Preferably, the length dimension L of the blank 10 is greater than 0.20 mm and less than 0.30 mm. The height dimension T of the blank 10 is greater than 0.15 mm and less than 0.25 mm. More preferably, the length dimension L of the blank 10 is 0.25 mm, and the height dimension T of the blank 10 is 0.20 mm.

[0080] According to the above structure, since the ratio of the difference in the inner diameter size is more than 0.1%, the area of ​​the inner side of the coil 20A can be increased compared to the case where the shape of the inner circumference of the coil is a perfect circle, and the L value can be significantly improved. In addition, since the ratio of the difference in the inner diameter size is less than 11%, the line length of the coil 20A can be shortened to reduce the resistance, and the Q value / L value can be maintained at more than 2.5, compared to the case where the shape of the inner circumference of the coil is a laterally long ellipse or rectangle. Therefore, by making the shape of the inner circumference of the coil 20A close to a square, the L value can be ensured and the Q value / L value can be maintained at more than 2.5. By maintaining the Q value / L value at more than 2.5, the efficiency of obtaining the Q value can be improved.

[0081] In addition, since the first inner diameter dimension D1 is larger than the second inner diameter dimension D2, when the length dimension L of the blank 10 is larger than the height dimension T of the blank 10, when viewed from the axis AX direction, the shape of the inner circumferential surface of the coil 20A can correspond to the shape of the outer surface of the blank 10. As a result, the space inside the blank 10 can be effectively used for the coil 20A, the area inside the coil 20A can be increased, and the efficiency of obtaining the L value can be improved.

[0082] Furthermore, since the first inner diameter D1 is larger than the second inner diameter D2, when the inductor component 1A is mounted on a mounting substrate with the bottom surface 17 of the base body 10 facing the mounting substrate, the coil 20A can be separated from the mounting substrate, thereby reducing stray capacitance with the mounting substrate.

[0083] In addition, since the length dimension L of the blank 10 is greater than 0.20 mm and less than 0.30 mm, and the height dimension T of the blank 10 is greater than 0.15 mm and less than 0.25 mm, when observed from the axis AX direction, the shape of the outer surface of the blank 10 is suitable for the shape of the inner circumferential surface of the coil 20A, in which the ratio of the difference in the inner diameter size is greater than 0.1% and less than 11%, and the internal space of the blank 10 can be effectively used for the coil 20A.

[0084] (Third Embodiment)

[0085] Figure 7 A third embodiment of the inductor component is shown, and is a perspective front view of the inductor component as seen from the first side surface. Fig. 8A , Figure 8B as well as Figure 8C : is an exploded top view of the inductor component. The shape of the coil of the third embodiment is different from that of the first embodiment. The following describes the different structure. The other structures are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are marked and their descriptions are omitted.

[0086] like Figure 7, Fig. 8A , Figure 8B as well as Figure 8C As shown, in the inductor component 1B of the third embodiment, the winding portion 20a of the coil 20B is a polygonal ring body when viewed from the axis AX direction. That is, when viewed from the axis AX direction, the inner peripheral surface of the coil 20B is a polygonal shape. In this embodiment, the polygon is a substantially quadrilateral.

[0087] When viewed from the axis AX direction, the coil 20B is formed along the outer surface of the body 10, the first external electrode 30, and the second external electrode 40. That is, the coil 20B includes a portion parallel to the top surface 18, a portion parallel to the first end surface 15, a portion parallel to the bottom surface 17, a portion parallel to the second end surface 16, a portion parallel to the first external electrode 30, and a portion parallel to the second external electrode 40.

[0088] The coil 20B has a first coil wiring layer 51 to a fourth coil wiring layer 54 stacked along the axis AX and a first conductive wiring layer 61 to a third conductive wiring layer 63 located between adjacent coil wiring layers in the direction of the axis AX and connecting adjacent coil wiring layers in the direction of the axis AX. Moreover, the coil wiring layers adjacent in the stacking direction are electrically connected in series via the conductive wiring layers. In this way, a plurality of coil wiring layers 51 to 54 are electrically connected in series to form a spiral.

[0089] The number of turns of each coil wiring layer 51 to 54 is less than one turn, but may be more than one turn. When viewed from the axis AX direction, each coil wiring layer 51 to 54 is composed of a straight line portion and a curved line portion. The curved line portion is formed by a plurality of continuous arcs.

[0090] The length of each conducting wiring layer 61 to 63 in the extending direction is shorter than the length of each coil wiring layer 51 to 54 in the extending direction. When viewed from the axis AX direction, each conducting wiring layer 61 to 63 is composed of a curved portion. The curved portion is formed of an arc.

[0091] The second inner diameter dimension D2 is larger than the inner diameter dimension of 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 inner diameter dimensions) is 0.1% or more and 11% or less. Preferably, the ratio of the difference in inner diameter dimensions is 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.

[0092] As with the blank 10 of the first embodiment, when viewed from the axis AX direction, the length dimension L of the blank 10 is larger than the height dimension T of the blank 10. Preferably, the length dimension L of the blank 10 is greater than 0.20 mm and less than 0.30 mm. The height dimension T of the blank 10 is greater than 0.15 mm and less than 0.25 mm. More preferably, the length dimension L of the blank 10 is 0.25 mm, and the height dimension T of the blank 10 is 0.20 mm.

[0093] According to the above structure, since the ratio of the difference in the inner diameter size is more than 0.1%, the area of ​​the inner side of the coil 20B can be increased compared to the case where the shape of the inner circumference of the coil is a perfect circle, and the L value can be significantly improved. In addition, since the ratio of the difference in the inner diameter size is less than 11%, the line length of the coil 20B can be shortened to reduce the resistance, and the Q value / L value can be maintained at more than 2.5, compared to the case where the shape of the inner circumference of the coil is a longitudinally long ellipse or rectangle. Therefore, by making the shape of the inner circumference of the coil 20B close to a square, the L value can be ensured and the Q value / L value can be maintained at more than 2.5. By maintaining the Q value / L value at more than 2.5, the efficiency of obtaining the Q value can be improved.

[0094] In addition, since the second inner diameter dimension D2 is larger than the first inner diameter dimension D1, when the first external electrode 30 is in an L-shape provided on the bottom surface 17 and the first end surface 15, and the second external electrode 40 is in an L-shape provided on the bottom surface 17 and the second end surface 16, the coil 20B can be kept away 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.

[0095] In addition, since the length dimension L of the blank 10 is greater than 0.20 mm and less than 0.30 mm, and the height dimension T of the blank 10 is greater than 0.15 mm and less than 0.25 mm, when observed from the axis AX direction, the shape of the outer surface of the blank 10 is suitable for the shape of the inner circumferential surface of the coil 20B, in which the ratio of the difference in the inner diameter size is greater than 0.1% and less than 11%, and the internal space of the blank 10 can be effectively used for the coil 20B.

[0096] (Other embodiments)

[0097] In addition, the present disclosure is not limited to the above-mentioned embodiments, and design changes can be made within the scope of the main purpose of the present disclosure. For example, various combinations of the characteristic points of the first to third embodiments can be made. For example, the number of coil wiring layers can be increased or decreased, and the number of conductive wiring layers can be increased or decreased.

[0098] In addition, the dimension of the green body in the longitudinal direction may be smaller than the dimension of the green body in the height direction. In addition, the winding portion of the coil may be formed into a spiral shape when viewed from the axial direction. In addition, the first external electrode and the second external electrode may be provided only on the bottom surface of the green body.

[0099] In addition, the coil wiring layer may have a pad portion at the end, and adjacent coil wiring layers may be connected via a columnar conductive layer. The diameter of the pad portion is larger than the line width of the middle portion of the coil wiring layer.

[0100] (Example)

[0101] Next, examples of the inductor component 1 described in the first embodiment will be described.

[0102] Fig. 9A This is a graph showing the relationship between the ratio of inner diameter dimensions and the Q value acquisition efficiency. Fig. 9A In the figure, the horizontal axis represents the first inner diameter dimension D1 / the second inner diameter dimension D2 which is a ratio between the inner diameter dimensions, and the vertical axis represents the Q value / L value which is the Q value acquisition efficiency. Fig. 9B This is a graph showing the relationship between the ratio of the inner diameter dimensions and the L value. Fig. 9B In the figure, the horizontal axis represents the first inner diameter dimension D1 / the second inner diameter dimension D2 , and the vertical axis represents the L value [nH]. Fig. 9C This is a graph showing the relationship between the ratio of inner diameter dimensions and the Q value. Fig. 9C In the figure, the horizontal axis represents the first inner diameter dimension D1 / the second inner diameter dimension D2, and the vertical axis represents the Q value [nH]. Fig. 9A , Fig. 9B as well as Fig. 9C , the values ​​when the second inner diameter D2 is kept constant and the first inner diameter D1 is changed are shown. The second inner diameter D2 is, for example, 159 μm.

[0103] like Fig. 9A As shown, the greater the ratio of the difference in inner diameter, that is, the greater the first inner diameter D1, the greater the ratio of the Q value to the L value. Fig. 9B As shown, the greater the ratio of the difference in the inner diameters, that is, the greater the first inner diameter D1, the greater the L value. Fig. 9C As shown, the larger the ratio of the difference between the inner diameter dimensions, that is, the larger the first inner diameter dimension D1, the larger the Q value.

[0104] Therefore, when the ratio of the difference in the inner diameter is 0.1% or more and 11% or less, the L value can be ensured and the ratio of Q value / L value can be kept at 2.5 or more. By keeping the value of Q value / L value at 2.5 or more, the efficiency of obtaining the Q value can be improved.

[0105] In addition, although in the above embodiment, the horizontal axis uses the ratio of the first inner diameter dimension D1 / the second inner diameter dimension D2, the same result can be obtained when the second inner diameter dimension D2 / the first inner diameter dimension D1 is greater than 1.01, that is, when the second inner diameter dimension D2 is larger than the first inner diameter dimension D1.

[0106] The present disclosure includes the following aspects.

[0107] <1> An inductor component comprising:

[0108] green body;

[0109] A coil is disposed in the blank and is wound in a spiral shape along the axis; and

[0110] The first external electrode and the second external electrode are arranged on the above-mentioned body and are electrically connected to the above-mentioned coil.

[0111] The blank comprises: a first end face and a second end face opposite to each other, a first side face and a second side face opposite to 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 opposite to the bottom face.

[0112] The first external electrode and the second external electrode are at least arranged on the bottom surface.

[0113] The axis is parallel to the bottom surface, and the axis intersects the first side surface and the second side surface.

[0114] When viewed from the axial direction, the inner diameter of the coil includes a first inner diameter dimension and a second inner diameter dimension, wherein the first inner diameter dimension is a dimension in a length direction opposite to the first end face and the second end face, and the second inner diameter dimension is a dimension in a height direction opposite to the top face and the bottom face.

[0115] One of the first inner diameter dimension and the second inner diameter dimension is larger than the other inner diameter dimension, and a ratio of an absolute value of a 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.

[0116] <2> The inductor component according to <1>, wherein:

[0117] The one inner diameter size is the first inner diameter size, and the other inner diameter size is the second inner diameter size.

[0118] <3> The inductor component according to <2>, wherein:

[0119] When viewed from the axial direction, a dimension of the blank in the longitudinal direction is larger than a dimension of the blank in the height direction.

[0120] <4> The inductor component according to <1>, wherein:

[0121] The one inner diameter size is the second inner diameter size, and the other inner diameter size is the first inner diameter size.

[0122] <5> The inductor component according to <4>, wherein:

[0123] The first external electrode is disposed on the bottom surface and the first end surface.

[0124] The second external electrode is provided on the bottom surface and the second end surface.

[0125] <6> The inductor component according to any one of <1> to <5>, wherein:

[0126] Observed from the axial direction, the dimension of the blank in the length direction is larger than that in the height direction. The dimension of the blank in the length direction is greater than 0.20 mm and less than 0.30 mm, and the dimension of the blank in the height direction is greater than 0.15 mm and less than 0.25 mm.

Claims

1. An inductor component comprising: green body; A coil is disposed in the blank and is wound in a spiral shape along the axis; and The first external electrode and the second external electrode are arranged on the above-mentioned body and are electrically connected to the above-mentioned coil. The blank comprises: a first end face and a second end face opposite to each other, a first side face and a second side face opposite to 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 opposite to the bottom face. The first external electrode and the second external electrode are at least arranged on the bottom surface. The axis is parallel to the bottom surface, and the axis intersects the first side surface and the second side surface. When viewed from the axial direction, the inner diameter of the coil includes a first inner diameter dimension and a second inner diameter dimension, wherein: The first inner diameter dimension is the dimension in the length direction where the first end face and the second end face face each other, and the second inner diameter dimension is the dimension in the height direction where the top face and the bottom face 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 a ratio of an absolute value of a 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.

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

3. The inductor component according to claim 2, wherein: When viewed from the axial direction, a dimension of the blank in the longitudinal direction is larger than a dimension of the blank in the height direction.

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

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

6. The inductor component according to any one of claims 1 to 5, wherein: Observed from the axial direction, the dimension of the blank in the length direction is larger than that in the height direction. The dimension of the blank in the length direction is greater than 0.20 mm and less than 0.30 mm, and the dimension of the blank in the height direction is greater than 0.15 mm and less than 0.25 mm.

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