inductor component

Abstract

Provided is an inductor component with improved acquisition efficiency of characteristics. The inductor component includes a rectangular parallelepiped-shaped base body (10) having a first side surface, and a spiral-shaped coil conductor layer (48) wound more than one turn on a main surface parallel to the first side surface inside the base body (10). The wiring interval (S1) between two adjacent wiring portions (straight portions (71), (75)) of the coil conductor layer (48) in a first direction (A1) from the inside to the outside of the coil conductor layer (48) is different from the wiring interval (S2) between two adjacent wiring portions (bent portions (82), (86)) in a second direction (A2) from the inside to the outside of the coil conductor layer (48).

Description

[0001] This application is a divisional application of application No. 202010088272.7, filed on February 12, 2020, entitled "Inductor Component". TECHNICAL FIELD

[0002] The present disclosure relates to an inductor component. BACKGROUND

[0003] Conventionally, electronic components are mounted on various electronic devices. As one of such electronic components, for example, a laminated inductor component is known (for example, refer to Patent Literature 1).

[0004] Patent Literature 1: Japanese Patent Application Publication No. 2013-153009

[0005] However, with the high frequency of signals used in electronic devices such as mobile phones, a small inductor component that can cope with high frequency signals is required for electronic devices. If the inductor component is simply made smaller, the wiring cross-sectional area decreases, and the coil inner diameter also becomes smaller, so the maximum values of the inductance value (L value) and the Q value that can be obtained decrease. Therefore, in a small inductor component for high frequency signals, a method of improving the efficiency of obtaining characteristics such as the L value and the Q value per unit volume will become important in the future.

[0006] Specifically, for example, if the structure of the inductor component like Patent Literature 1 is maintained to increase the inductance value, the number of layers of the coil conductor layer needs to be increased. In this case, the laminated body increases in the laminating direction, and the outer shape of the inductor component increases, so that miniaturization cannot be achieved. In addition, in the inductor component like Patent Literature 1, if the number of turns of each coil conductor layer is one or more in order to increase the inductance value with the same outer shape, the magnetic flux generated by the two wirings parallel in each coil conductor layer will interfere with each other and the Q value will decrease. SUMMARY

[0007] An object of the present disclosure is to provide an inductor component in which the efficiency of obtaining characteristics is improved.

[0008] An inductor component according to one embodiment of the present disclosure includes a rectangular parallelepiped-shaped base body having a first side surface, and a spiral-shaped coil conductor layer wound more than one turn on a main surface parallel to the first side surface in the base body, in which a wiring interval between two wiring portions adjacent in a first direction from an inner side of the coil conductor layer toward an outer side of the coil conductor layer is different from a wiring interval between two wiring portions adjacent in a second direction different from the first direction from the inner side of the coil conductor layer toward the outer side of the coil conductor layer.

[0009] In the adjacent two wiring portions, the magnetic fluxes generated by the currents flowing in each of the wiring portions cancel each other out. According to the above-described structure, since the wiring intervals of the adjacent two wiring portions are different, there are portions in which the cancellation of the magnetic fluxes with each other is reduced, and thus the efficiency of acquisition of characteristics is improved. Further, the "wiring interval" described above indicates the shortest distance between the adjacent two wiring portions.

[0010] According to one embodiment of the present disclosure, an inductor component in which the efficiency of acquisition of characteristics is improved can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic perspective view of an inductor component.

[0012] Figure 2 is a schematic perspective view of an inductor component.

[0013] Figure 3 is a schematic perspective view of an inductor component.

[0014] Figure 4 is a plan view showing the coil conductor layer and the insulator layer of the external electrode layer.

[0015] Figure 5 is an exploded perspective view of an inductor component.

[0016] Figure 6 is a plan view showing the coil conductor layer and the insulator layer of the external electrode layer.

[0017] Figure 7 (a), (b) in FIG. 4 are partial enlarged views of the coil conductor layer.

[0018] Figure 8 is an explanatory diagram showing the relationship between the wiring interval S2 and the L value.

[0019] Figure 9 is an explanatory diagram showing the relationship between the difference in the radius of curvature R4-R2 and the Q value.

[0020] Figure 10 is an explanatory diagram showing the relationship between the wiring interval S2 and the Q value.

[0021] Figure 11 is an explanatory diagram showing the relationship between the ratio of the wiring interval S2 / S1 and the Q value.

[0022] Figure 12 (a), (b) in FIG. 6 are explanatory diagrams showing the coil conductor layer of the inductor of the modification example. DETAILED DESCRIPTION

[0023] Hereinafter, one embodiment will be described.

[0024] Moreover, the constituent elements are exaggeratedly illustrated in the drawings for the sake of easy understanding. There are cases where the size ratio of the constituent elements is different from the actual size or from the size in other drawings.

[0025] Figure 1 is a schematic perspective view showing the appearance of the inductor component 1. The inductor component 1 is provided with a base 10. The base 10 is a base material on which each component of the inductor component 1 is arranged, and is substantially a cuboid shape. Moreover, in the present specification, the "cuboid shape" includes a cube in which the corners and edges are chamfered, a cuboid in which the corners and edges are rounded. In addition, the "cuboid shape" can be a shape in which concavities and convexities are formed on a part or all of the main surfaces and side surfaces, or a shape in which the opposing surfaces are not completely parallel but are inclined to some extent.

[0026] The base 10 has a mounting surface 11. The mounting surface 11 is a surface that opposes a circuit board when the inductor component 1 is mounted on the circuit board. The base 10 has an upper surface 12 that is parallel to the mounting surface 11. In addition, the base 10 has two pairs of surfaces that are orthogonal to the mounting surface 11. One pair of surfaces of one of the two pairs of surfaces is set as a first side surface 13 and a second side surface 14, and one pair of surfaces of the other of the two pairs of surfaces is set as a first end surface 15 and a second end surface 16. Moreover, the first end surface 15 and the second end surface 16 are orthogonal to the first side surface 13 and the second side surface 14.

[0027] In the present specification, the direction perpendicular to the upper surface 12 and the mounting surface 11 is set as the "height direction", the direction perpendicular to the first side surface 13 and the second side surface 14 is set as the "width direction", and the direction perpendicular to the first end surface 15 and the second end surface 16 is set as the "length direction". As a specific example, the "length direction L", the "height direction T", and the "width direction W" are illustrated in FIG. 1. Figure 1 Moreover, the size of the "width direction" is set as the "width dimension", the size of the "height direction" is set as the "height dimension", and the size of the "length direction" is set as the "length dimension". Moreover, hereinafter, the mounting surface 11 side in the height direction of the inductor component 1 is set as the lower side, and the upper surface 12 side is set as the upper side.

[0028] In Figure 2In the base 10 shown, the size (length dimension LI) of the length direction L is preferably greater than 0 mm and 1.0 mm or less. For example, the length dimension LI is 0.6 mm. Also, in the base 10, the size (width dimension Wl) of the width direction W is preferably greater than 0 mm and 0.6 mm or less. The width dimension Wl is preferably 0.36 mm or less, and more preferably 0.33 mm or less. For example, the width dimension Wl of the base 10 is 0.3 mm. Also, in the base 10, the size (height dimension Tl) of the height direction T is preferably greater than 0 mm and 0.8 mm or less. For example, the height dimension Tl of the base 10 is 0.4 mm.

[0029] The inductor component 1 has a first external electrode 20 and a second external electrode 30 exposed on the surface of the base 10. The first external electrode 20 is exposed on the mounting surface 11 of the base 10. Also, the first external electrode 20 is exposed on the first end surface 15 of the base 10. The second external electrode 30 is exposed on the mounting surface 11 of the base 10. Also, the second external electrode 30 is exposed on the second end surface 16 of the base 10. In other words, on the mounting surface 11, the first external electrode 20 and the second external electrode 30 are exposed. In other words, the surfaces on which the first external electrode 20 and the second external electrode 30 are exposed in the base 10 are the mounting surface 11.

[0030] The first external electrode 20 is formed on the first end surface 15 to a length of approximately 1 / 2 of the height of the base 10 from the mounting surface 11 of the base 10. The first external electrode 20 is formed on the base 10 approximately at the center in the width direction W, and the width dimension of the first external electrode 20 is smaller than the width dimension of the base 10, for example, 0.24 mm. Also, the first external electrode 20 is formed on the mounting surface 11, for example, to a length of 0.15 mm from the first end surface 15. The second external electrode 30 is formed on the second end surface 16 to a length of approximately 1 / 2 of the height of the base 10 from the mounting surface 11 of the base 10. In the present embodiment, the second external electrode 30 is formed on the base 10 approximately at the center in the width direction W, and the width dimension of the second external electrode 30 is smaller than the width dimension of the base 10, for example, 0.24 mm. Also, the second external electrode 30 is formed on the mounting surface 11, for example, to a length of 0.15 mm from the second end surface 16. Also, the width dimension of the first external electrode 20 and the second external electrode 30 can be equal to the width dimension of the base 10.

[0031] Figure 2 , Figure 3 and Figure 4 are diagrams for describing the structure of each part of the internal structure of the inductor component 1. The inductor component 1 has a coil 40 provided in the base 10. In the present embodiment, the coil 40 is provided in the base 10 in the form of a spiral. Figure 2 and Figure 3In the diagram, the base layers 21 and 31 of the coil 40, the first external electrode 20 (described later), and the second external electrode 30 located within the substrate 10 are represented by solid lines, and the substrate 10 is represented by a double-dotted line. Additionally, in... Figure 2 In this context, the interior of the substrate 10 is readily understood by omitting the covering layers 22 and 32 of the first external electrode 20 and the second external electrode 30, which are located outside the substrate 10 and will be described later.

[0032] like Figure 5 As shown, the substrate 10 comprises a plurality of plate-shaped insulating layers 60 having rectangular main surfaces parallel to the first side surface 13. The substrate 10 is a cuboid shape formed by stacking the plurality of insulating layers 60 in a width direction W perpendicular to the first side surface 13. Therefore, the width direction W is the stacking direction of the insulating layers 60. Furthermore, the length direction L and the height direction T, both perpendicular to the width direction W, are one of the intra-layer directions perpendicular to the stacking direction. Each insulating layer is labeled with reference numerals "61, 62, 63a-63h, 64, 65" to distinguish them. In the following description, reference numeral "60" is used when not distinguishing between the plurality of insulating layers, and reference numerals "61, 62, 63a-63h, 64, 65" are used when distinguishing them.

[0033] Furthermore, depending on the manufacturing processes such as conductor layer formation, lamination, firing, and curing, the main surface of the insulating layer 60 may be slightly inclined and not completely parallel to the first side surface 13, or it may contain unevenness within the surface. In such cases, the main surface of the insulating layer 60 is still substantially parallel to the first side surface 13. In addition, depending on the manufacturing processes such as firing and curing, the interfaces between the insulating layers 60 may be unclear.

[0034] As for the material of the insulating layer 60, it is preferable to use a material with a relative permeability of "2" or less. For example, non-magnetic materials such as borosilicate glass, alumina, zirconium oxide, and polyimide resin can be used. Furthermore, the material of the insulating layer 60 is more preferably one with a relative permeability close to "1". However, depending on how the inductor component 1 is used, the insulating layer 60 can be made of a magnetic material, or ferrite, resin containing magnetic powder, etc. can be used as the material.

[0035] The colors of insulating layers 61 and 65 differ from the colors of other insulating layers 62, 63a-63h, and 64. Figure 1The insulator layers 61 and 65 are distinguished from other insulator layers by hatching and solid lines. Thus, when the inductor component 1 is mounted, detection of the inductor component 1 being upside down or the like can be performed. Further, the colors of the insulator layers 61 and 65 can be the same as those of the other insulator layers 62, 63a to 63h, and 64, and if the length dimension LI, the width dimension Wl, and the height dimension Tl are different values, respectively, detection of the inductor component 1 being upside down or the like can be performed even if the colors are the same as described above.

[0036] The first external electrode 20 and the second external electrode 30 are input and output terminals for electric signals of the coil 40 in the inductor component 1, and are connection portions to circuit wiring when the inductor component 1 is mounted to a circuit substrate.

[0037] As shown in FIG. 1, the first external electrode 20 of the present embodiment includes a base layer 21 and a cover layer 22. The base layer 21 is buried in the base 10. The base layer 21 is formed in an L shape as viewed in the width direction W. Further, the second external electrode 30 of the present embodiment includes a base layer 31 and a cover layer 32. The base layer 31 is buried in the base 10. The base layer 31 is formed in an L shape as viewed in the width direction W. Figure 3

[0038] The first external electrode 20 and the second external electrode 30 are input and output terminals for electric signals of the coil 40 in the inductor component 1, and are connection portions to circuit wiring when the inductor component 1 is mounted to a circuit substrate.

[0039] As the material of the cover layers 22 and 32, a material having high solder resistance and high solder wettability can be used. For example, a metal such as nickel (Ni), copper (Cu), tin (Sn), gold (Au), or an alloy containing these metals, or the like can be used. Further, the cover layers can be formed of a plurality of layers. For example, the cover layers 22 and 32 include a Ni plating layer covering the first external electrode 20 and the second external electrode 30, and a Sn plating layer covering the surface of the Ni plating layer. The cover layers 22 and 32 prevent oxidation of the surfaces of the first external electrode 20 and the second external electrode 30. The cover layers 22 and 32 can protrude from the base 10, or can be formed flush with each face of the base 10.

[0040] As shown in FIG. 1, the first external electrode 20 of the present embodiment includes a base layer 21 and a cover layer 22. The base layer 21 is buried in the base 10. The base layer 21 is formed in an L shape as viewed in the width direction W. Further, the second external electrode 30 of the present embodiment includes a base layer 31 and a cover layer 32. The base layer 31 is buried in the base 10. The base layer 31 is formed in an L shape as viewed in the width direction W. Figure 2 ​As shown, the base layer 21 is provided at each corner of the insulator layers 63a to 63h, and includes a plurality of external conductor layers 23 arranged in the width direction W. The plurality of external conductor layers 23 are directly connected to each other in the width direction W, and form one base layer 21. Similarly, the base layer 31 includes a plurality of external conductor layers 33 arranged in the width direction W. The plurality of external conductor layers 33 are directly connected to each other in the width direction W, and form one base layer 31. Further, as shown in Figure 2 The external conductor layers 23, 33 are not limited to the case where they contact each other in the entire surface in the width direction, but can be formed on the main surfaces of the insulator layers 63a to 63h so as not to directly contact each other. In this case, the external conductor layers 23, 33 can be electrically connected to each other in the width direction W by the conductor layers and the vias which pass through the insulator layers 63b to 63h between the external conductor layers 23, 33, or can not be electrically connected to each other at all.

[0041] As shown in Figure 3 The first end of the coil 40 is connected to the first external electrode 20, and the second end of the coil 40 is connected to the second external electrode 30.

[0042] The coil 40 has a coil portion 40a which concentrates magnetic flux generated by current input and output via the first external electrode 20 and the second external electrode 30, and generates a large inductance, and first and second lead conductor layers 40b, 40c which connect both ends of the coil portion 40a to the first and second external electrodes 20, 30, respectively.

[0043] As shown in Figure 4 and Figure 5 The coil portion 40a includes a plurality of coil conductor layers 41 to 48 arranged in the width direction W in the base 10, and via conductor layers 51 to 57 which electrically connect the coil conductor layers 41 to 48 in the width direction W.

[0044] As shown in Figure 4 and Figure 5 Each of the coil conductor layers 41 to 48 is a conductor layer which is wound more than one turn in a spiral shape along the main surfaces of the insulator layers 63a to 63h in the base 10. The so-called spiral shape is a spiral shape in a plane, and is distinguished from a Helical shape. Further, in Figure 4 In the drawings, the outline of the insulator layer 60 (63a to 63h) is indicated by a double-dot chain line.

[0045] As shown in Figure 4As shown, in this embodiment, the coil conductor layers 41-48 are spiral-shaped, roughly following two annular tracks O1 and O2. Therefore, the number of turns in the coil conductor layers 41-48 of this embodiment is more than one turn and less than two turns. However, the number of turns in the coil conductor layers 41-48 can be more than one turn or more than two turns. In this embodiment, the annular tracks O1 and O2 are rectangular. Furthermore, as... Figure 4 As shown, viewed from the width direction W, portions of the coil conductor layers 41-48 overlap to form two annular tracks O1 and O2. Furthermore, "overlapping" also includes cases where there is slight non-overlap due to manufacturing differences. In addition, the shape of the coil portion 40a (the shape of tracks O1 and O2) can be, besides the aforementioned rectangle, a polygon, a circle, an ellipse, or a combination of these shapes. Furthermore, the shape of the outer track O1 and the inner track O2 can also be different.

[0046] like Figure 4 as well as Figure 5 As shown, the coil conductor layers 41-48 are electrically connected in series via conductor layers 51-57 that have through-holes penetrating the insulation layers 63b-63h in the width direction W. Furthermore, in Figure 4 as well as Figure 5 In the diagram, the through-hole conductor layers 51 to 57 are represented by the dotted line between the coil conductor layers 41 to 48.

[0047] The materials used for the coil conductor layers 41-48, the via conductor layers 51-57, the first lead conductor layer 40b, and the second lead conductor layer 40c are, for example, conductive materials such as metals with low resistance, like silver (Ag), copper (Cu), or gold (Au), or alloys of these metals as the main component. Furthermore, the outer conductor layers 23 and 33 are, for example, formed of conductive materials such as metals with low resistance, like silver (Ag), copper (Cu), or gold (Au), or alloys of these metals as the main component. Alternatively, a structure in which glass is dispersed within these conductive materials may also be used.

[0048] like Figure 2 as well as Figure 3 As shown, the coil portion 40a, the first lead conductor layer 40b, and the second lead conductor layer 40c have a structure that is rotationally symmetrical (rotated 180 degrees) with respect to an axis extending from the center of the mounting surface 11 in a direction orthogonal to the mounting surface 11. Therefore, even if the connection relationship between the first external electrode 20 and the second external electrode 30 and the substrate wiring connecting the first external electrode 20 and the second external electrode 30 is reversed, the same characteristics can be obtained.

[0049] The coil conductor layer is described in detail.

[0050] In this embodiment,Figure 4 and Figure 5 The coil conductor layers 41 to 48 of the insulator layers 63a to 63h are formed based on the same technical idea. Therefore, here, one coil conductor layer, for example, the coil conductor layer 48 of the insulator layer 63h, is described in detail, and the drawings and the description regarding the other coil conductor layers 41 to 47 are omitted.

[0051] Figure 6 The coil conductor layer 48, the second lead conductor layer 40c, the external conductor layers 23, 33 on the main surface of the insulator layer 63h are shown.

[0052] The coil conductor layer 48 has a plurality of straight portions 71, 72, 73, 74, 75, 76, 77, and curved portions (corner portions) 81, 82, 83, 84, 85, 86 between the straight portions 71, 72, 73, 74, 75, 76, 77. The straight portions 71, 73, 75, 77 extend in the length direction L of the base 10. The straight portions 72, 74, 76 extend in the height direction T of the base 10. In other words, the straight portions 71, 73, 75, 77 and the straight portions 72, 74, 76 extend in two directions (the length direction L, the height direction T) orthogonal to each other.

[0053] The straight portions 71, 72, 73, 74 form a part of the outer peripheral track O1, and the straight portions 75, 76, 77 form a part of the inner peripheral track O2. However, a part of the straight portion 75 forms a part of the inner peripheral track O2, and the end portion of the straight portion 75 is connected to the straight portion 75 of the outer peripheral track O1. In other words, the straight portion 75 has a part on the inner peripheral track O2, and a part between the inner peripheral track O2 and the outer peripheral track O1.

[0054] In the coil conductor layer 48 of the present embodiment, by having the rectangular outer peripheral track O1 (the straight portions 71, 72, 73, 74 and the curved portions 81, 82, 83), the outer shape can be increased. In addition, in the coil conductor layer 48, by having the rectangular inner peripheral track O2 (a part of the straight portion 75, the straight portions 76, 77, and the curved portions 85, 86), the length (the wiring length) can be extended. Therefore, the Q value of the inductor component 1 is increased.

[0055] In the present embodiment, each curved portion 81 to 86 is curvedly formed so as to be continuous with the connected straight portion. In other words, each curved portion 81 to 86 has an inner side edge of the coil conductor layer 48, and an outer side edge of the coil conductor layer, and these edges are in circular arc shapes of about one fourth of the circumference of a circle.

[0056] Here, in a certain direction from the inside to the outside of the coil conductor layer 48, a portion of the coil conductor layer 48 that intersects a semi-linear path from the inside to the outside of the coil conductor layer 48 in that direction is designated as a wiring portion arranged in that direction. Furthermore, adjacent portions of the wiring portions arranged in that direction are designated as adjacent wiring portions in that direction. For example, as... Figure 6 As shown, the straight portion 71 of the outer circumferential track O1 and the straight portion 75 of the inner circumferential track O2 are adjacent wiring portions in a first direction A1 from the inside of the coil conductor layer 48 toward the outside. Similarly, the curved portion 82 of the outer circumferential track O1 and the curved portion 86 of the inner circumferential track O2 are adjacent wiring portions in a second direction A2 from the inside of the coil conductor layer 48 toward the outside, which is different from the first direction A1.

[0057] In this embodiment, the wiring spacing S2 of adjacent curved portions 82 and 86 in the second direction A2 is larger than the wiring spacing S1 of adjacent straight portions 71 and 75 in the first direction A1. Furthermore, Figure 6 The wiring spacing of the bent portions 81 and 85 shown is also larger than the wiring spacing S1 of the straight portions 71 and 75. In other words, the inductor component 1 has a spiral coil conductor layer 48 wound with more than one turn on the main surface of the insulating layer 63h. In addition, the wiring spacing S1 of the two adjacent wiring portions of the coil conductor layer 48 in the first direction A1, i.e., the straight portions 71 and 75, is different from the wiring spacing S2 of the two adjacent wiring portions in the second direction A2, i.e., the bent portions 82 and 86.

[0058] In a spiral coil conductor layer, such as the coil conductor layer 48 of inductor component 1, which has more than one turn wound, the magnetic flux generated on the outer peripheral track O1 cancels out the magnetic flux generated on the inner peripheral track O2. Therefore, compared to a coil conductor layer with less than one turn wound, the efficiency of obtaining the L value per unit area of ​​the main surface of the insulator layer decreases, and the Q value also decreases. On the other hand, in inductor component 1, since the wiring intervals S1 and S2 are different, at least on the side with the larger wiring interval (bends 82 and 86), the cancellation of magnetic flux between the outer peripheral track O1 and the inner peripheral track O2 can be reduced. Thus, for example, in inductor component 1, the efficiency of obtaining the L value relative to the size can be improved.

[0059] Furthermore, the adjacent wiring portions are not limited to the case where the wiring portions of the outer peripheral track O1 and the wiring portions of the inner peripheral track have the same shape, as in the straight portions 71 and 75 and the curved portions 82 and 86. For example, the wiring portion of the outer peripheral track O1 may be straight, and the wiring portion of the inner peripheral track O2 may be curved.

[0060] (Manufacturing method)

[0061] Next, refer to Figure 5The manufacturing method of the inductor component 1 described above will be described.

[0062] First, a mother insulator layer to be the insulator layer 61 is formed. The so-called mother insulator layer is a large sheet of the insulator layer arranged in a matrix shape in a state where a plurality of the insulator layers 61 are connected. For example, an insulating paste mainly composed of borosilicate glass is applied on a carrier film to form the mother insulator layer to be the insulator layer 61. In the present embodiment, an insulating paste having a relative magnetic permeability of "2" or less after firing is used. Further, the insulating paste used for the insulator layer 61 is colored differently from the insulating paste used for the insulator layers 62, 63a to 63h, and 64.

[0063] Next, a mother insulator layer to be the insulator layer 62 is formed. The insulating paste is applied on the mother insulator layer to be the insulator layer 61 to form the mother insulator layer to be the insulator layer 62.

[0064] Next, a mother insulator layer to be the insulator layer 63a is formed. The insulating paste is applied on the mother insulator layer to be the insulator layer 62 to form the mother insulator layer to be the insulator layer 63a.

[0065] Next, the coil conductor layer 41, and the external conductor layers 23, 33 are formed. For example, a conductive paste mainly composed of Ag as a metal is applied on the mother insulator layer to be the insulator layer 63a to form a conductive paste layer. At this time, the conductive paste can be patterned by screen printing the conductive paste using a screen plate having portions corresponding to the coil conductor layer 41, and the external conductor layers 23, 33 opened, or the conductive paste can be patterned by photolithography. Thus, the coil conductor layer 41, and the external conductor layers 23, 33 before firing are formed on the mother insulator layer to be the insulator layer 63a.

[0066] Next, a mother insulator layer to be the insulator layer 63b is formed. After the insulating paste is applied on the mother insulator layer to be the insulator layer 63a, the positions where the via conductor layer 51, and the external conductor layers 23, 33 are to be formed are removed by laser processing, photolithography, or the like. Thus, the mother insulator layer to be the insulator layer 63b having through-holes at positions corresponding to the via land of the coil conductor layer 41, and having corners corresponding to the external conductor layers 23, 33 cut off is formed.

[0067] Next, the coil conductor layer 42, the via conductor layer 51, and the external conductor layers 23, 33 are formed. As with the coil conductor layer 41 described above, the conductive paste is applied to form a conductive paste layer on the mother insulator layer to be the insulator layer 63b. At this time, the conductive paste is filled into the through holes and the cutout portions described above. Thus, the coil conductor layer 42, the via conductor layer 51, and the external conductor layers 23, 33 before firing are formed on the mother insulator layer to be the insulator layer 63b.

[0068] After that, by alternately repeating the process of forming the mother insulator layer and the process of forming the conductive paste layer, the mother insulator layers to be the insulator layers 63c to 63h, the coil conductor layers 42 to 48 before firing, the external conductor layers 23, 33, and the via conductor layers 52 to 57 are formed.

[0069] Next, as with the mother insulator layer to be the insulator layer 62 described above, the mother insulator layer to be the insulator layer 63h is formed to be the mother insulator layer of the insulator layer 64. Then, as with the mother insulator layer to be the insulator layer 61 described above, the mother insulator layer to be the insulator layer 64 is formed to be the mother insulator layer of the insulator layer 65.

[0070] By the above process, the mother laminate including a plurality of the substrates 10 arranged in a matrix shape and connected to each other is obtained.

[0071] Next, the unfired substrate 10 is obtained by cutting or the like the mother laminate. In the cutting process, the external conductor layers 23, 33 are exposed from the substrate 10 on the cut surface formed by the cutting. Further, since the substrate 10 shrinks in the firing described later, the mother laminate is cut taking the shrinkage into consideration.

[0072] Next, the unfired substrate 10 is fired under prescribed conditions to obtain the substrate 10. Further, the substrate 10 is subjected to barrel polishing. After the barrel polishing, the cover layer 22 covering the external conductor layers 23, 33 is formed. For example, the cover layer 22 can be formed by an electroplating method, an electroless plating method, or the like.

[0073] By the above process, the inductor component 1 is completed.

[0074] Further, the manufacturing method described above is an example, and if the structure of the inductor component 1 can be achieved, other publicly known manufacturing methods can be substituted or added thereto. For example, the insulator layer can be formed by electroplating a curable resin, a coil conductor layer, or the like without firing.

[0075] (Action)

[0076] Next, the action of the inductor component 1 described above will be described.

[0077] As Figure 4 indicated in Figure 5 , the coil conductor layers 41 to 48 are helical along the outer peripheral track O1 and the inner peripheral track O2.

[0078] As Figure 6 indicated in , the inductor component 1 includes a rectangular parallelepiped-shaped base 10 having a first side surface 13, and a plurality of coil conductor layers 41 to 48 helically wound more than one turn in a direction orthogonal to the first side surface 13 within the base 10 and on a main surface parallel to the first side surface 13. The wiring interval (for example, wiring interval S1) of two adjacent wiring portions (for example, straight portions 71, 75) in a direction from the inner side toward the outer side of each of the coil conductor layers 41 to 48 (for example, first direction Al) is different from the wiring interval (for example, wiring interval S2) of two adjacent wiring portions (bent portions 82, 86) in a direction from the inner side toward the outer side of the coil conductor layers 41 to 48 (for example, second direction A2). Therefore, as described above, in the inductor component 1, the efficiency of obtaining the L value can be improved.

[0079] Further, it is preferable that the inductor component 1 include a structure as follows.

[0080] Figure 7 Figure 7 (a) and (b) represent a portion of the coil conductor layer 48 in an enlarged manner.

[0081] Figure 7 (a) represents an example in which the curvature radius R4 of the bent portion 86 of the inner peripheral track O2 is larger than the curvature radius R2 of the bent portion 82 of the outer peripheral track O1. Figure 7 (b) represents an example in which the curvature radius R4 of the bent portion 86 of the inner peripheral track O2 is the same as the curvature radius R2 of the bent portion 82 of the outer peripheral track O1 (the same shape of the bent portions 82, 86).

[0082] In Figure 7 either of the example shown in (a) and Figure 7 the example shown in (b), the wiring interval S2 of the bent portions 82, 86 is larger than the wiring interval S1 of the straight portions 72, 76, and the improvement of the efficiency of obtaining the L value described above can be achieved.

[0083] On the other hand, in Figure 7 (b), by setting the shape of the bent portion 86 of the inner peripheral track O2 to be the same as the shape of the bent portion 82 of the outer peripheral track O1, the area of the inner side of the inner peripheral track O2 can be increased, and the circumference of the inner peripheral track O2 can be increased.

[0084] As such, generally, by increasing the length of the inner circumferential orbit O2, an improvement effect of the Q value of the inductor component 1 can be expected. However, the present inventors have found that in a spiral coil conductor layer wound more than one turn like the coil conductor layer 48, by increasing the length of the inner circumferential orbit O2, the proportion of the parallel wiring portions increases, and cancellation of magnetic flux occurs between adjacent wiring portions. Thus, the improvement effect of the Q value of the inductor component 1 caused by increasing the length of the inner circumferential orbit O2 is less than expected.

[0085] Therefore, as shown in (a), in the inductor component 1, the curvature radius R4 of the curved portion 86 of the inner circumferential orbit O2 is preferably larger than the curvature radius R2 of the curved portion 82 of the outer circumferential orbit O1. According to the difference between the curvature radius R4 of the curved portion 86 of the inner circumferential orbit O2 and the curvature radius R2 of the curved portion 82 of the outer circumferential orbit O1, the lengths of the straight portions 72, 76 are shortened. Thus, in the outer circumferential orbit O1 and the inner circumferential orbit O2, the parallel wiring portions are shortened, and cancellation of magnetic flux between adjacent wiring portions can be reduced. Figure 7

[0086] As described above, from the viewpoint of reducing cancellation of magnetic flux between adjacent wiring portions, the difference between the curvature radius R4 of the curved portion 86 of the inner circumferential orbit O2 and the curvature radius R2 of the curved portion 82 of the outer circumferential orbit O1 is preferably large. However, if the difference between the curvature radius R4 of the curved portion 86 and the curvature radius R2 of the curved portion 82 of the outer circumferential orbit O1 is increased, the area on the inner side of the inner circumferential orbit O2 decreases, and the Q value decreases. The present inventors have confirmed changes in characteristics caused by the relationship between the curvature radius R4 of the curved portion 86 and the curvature radius R2 of the curved portion 82 of the outer circumferential orbit O1 by making the inductor component 1 as follows.

[0087] [Embodiment]

[0088] In Table 1, for Embodiments 1 to 6, the dimensions of each portion, the ratio S2 / S1 of the wiring interval S2 with respect to the wiring interval S1, and the difference in curvature radius R4-R2 are shown. In addition, in the description of the dimensions of each portion, the dimensions of the component (the curved portions 82, 86, etc.) shown in (a) are used. Figure 7 (a) shown.

[0089] [Table 1]

[0090]

[0091] (Embodiment 1)

[0092] ​The inductor component of Example 1 has a wiring width Lw (μm) = 18.9, a wiring interval S1 (μm) = 22.0, a curvature radius R1 (μm) = 27.3, a curvature radius R2 (μm) = 8.4, a curvature radius R3 (μm) = 27.3, a curvature radius R4 (μm) = 8.4, and a wiring interval S2 (μm) = 38.9. In this inductor component, the ratio S2 / S1 of the wiring interval S2 to the wiring interval S1 is 1.8, and the difference R4-R2 between the curvature radius R4 of the curved portion 86 of the inner peripheral track O2 and the curvature radius R2 of the curved portion 82 of the outer peripheral track O1 is 0.0.

[0093] (Example 2)

[0094] The inductor component of Example 2 has a wiring width Lw (μm) = 18.9, a wiring interval S1 (μm) = 22.0, a curvature radius R1 (μm) = 27.3, a curvature radius R2 (μm) = 8.4, a curvature radius R3 (μm) = 38.9, a curvature radius R4 (μm) = 20.0, and a wiring interval S2 (μm) = 43.7. In this inductor component, the ratio S2 / S1 of the wiring interval S2 to the wiring interval S1 is 2.0, and the difference R4-R2 between the curvature radius R4 of the curved portion 86 of the inner peripheral track O2 and the curvature radius R2 of the curved portion 82 of the outer peripheral track O1 is 11.6.

[0095] (Example 3)

[0096] The inductor component of Example 3 has a wiring width Lw (μm) = 18.9, a wiring interval S1 (μm) = 22.0, a curvature radius R1 (μm) = 27.3, a curvature radius R2 (μm) = 8.4, a curvature radius R3 (μm) = 58.9, a curvature radius R4 (μm) = 40.0, and a wiring interval S2 (μm) = 52.0. In this inductor component, the ratio S2 / S1 of the wiring interval S2 to the wiring interval S1 is 2.4, and the difference R4-R2 between the curvature radius R4 of the curved portion 86 of the inner peripheral track O2 and the curvature radius R2 of the curved portion 82 of the outer peripheral track O1 is 31.6.

[0097] (Example 4)

[0098] The inductor component of this embodiment 5 has a wiring width Lw (μm) = 18.9, a wiring interval S1 (μm) = 22.0, a curvature radius R1 (μm) = 27.3, a curvature radius R2 (μm) = 8.4, a curvature radius R3 (μm) = 98.9, a curvature radius R4 (μm) = 80.0, and a wiring interval S2 (μm) = 66.8. In this inductor, the ratio S2 / S1 of the wiring interval S2 to the wiring interval S1 is 3.1, and the difference R4-R2 between the curvature radius R4 of the curved portion 86 of the inner peripheral track O2 and the curvature radius R2 of the curved portion 82 of the outer peripheral track O1 is 71.6.

[0099] (Embodiment 5)

[0100] The inductor component of this embodiment 5 has a wiring width Lw (μm) = 18.9, a wiring interval S1 (μm) = 22.0, a curvature radius R1 (μm) = 27.3, a curvature radius R2 (μm) = 8.4, a curvature radius R3 (μm) = 98.9, a curvature radius R4 (μm) = 80.0, and a wiring interval S2 (μm) = 66.8. In this inductor, the ratio S2 / S1 of the wiring interval S2 to the wiring interval S1 is 3.1, and the difference R4-R2 between the curvature radius R4 of the curved portion 86 of the inner peripheral track O2 and the curvature radius R2 of the curved portion 82 of the outer peripheral track O1 is 71.6.

[0101] (Embodiment 5)

[0102] The inductor component of this embodiment 5 has a wiring width Lw (μm) = 18.9, a wiring interval S1 (μm) = 22.0, a curvature radius R1 (μm) = 27.3, a curvature radius R2 (μm) = 8.4, a curvature radius R3 (μm) = 98.9, a curvature radius R4 (μm) = 80.0, and a wiring interval S2 (μm) = 66.8. In this inductor, the ratio S2 / S1 of the wiring interval S2 to the wiring interval S1 is 3.1, and the difference R4-R2 between the curvature radius R4 of the curved portion 86 of the inner peripheral track O2 and the curvature radius R2 of the curved portion 82 of the outer peripheral track O1 is 71.6.

[0103] (Relationship between the dimensions of the coil conductor layer and the characteristics of the inductor component)

[0104] For the above-described embodiments 1 to 6, inductor components were produced that included the above-described dimensions of the coil conductor layer, and for each of the inductor components, the L value and the Q value were measured for an input signal at a frequency of 500 MHz.

[0105] Figure 8 The points P1 to P6 in the graph of FIG. 6 indicate the L values measured for the inductor components of embodiments 1 to 6. In addition, the points P1 to P6 in the graph of FIG. 7 indicate the Q values measured for the inductor components of embodiments 1 to 6. Figure 8The horizontal axis represents the wiring interval S2 of the curved sections 82 and 86, and the vertical axis represents the L value.

[0106] like Figure 8 As shown, relative to a certain wiring interval S1 (22.0 mm), as the wiring interval S2 between the curved portion 86 of the inner circumferential track O2 and the curved portion 82 of the outer circumferential track O1 increases, the L value initially increases. However, if a certain wiring interval (S2 ≈ 40.0 μm) is exceeded, the L value decreases. Thus, it can be seen that initially, the effect of reducing magnetic flux is higher than the effect of the shrinking inner region of the coil conductor layer 48 on the L value. However, if a certain wiring interval is exceeded, the effect of the shrinking inner region of the coil conductor layer 48 outweighs the effect of reducing magnetic flux.

[0107] Figure 9 Points P1 to P6 in the diagram represent the Q values ​​measured for the inductor components of Examples 1 to 6. Furthermore, Figure 9 The horizontal axis is the difference between the radius of curvature R4 of the curved portion 86 of the inner circumferential track O2 and the radius of curvature R2 of the curved portion 82 of the outer circumferential track O1, R4-R2, and the vertical axis is the Q value.

[0108] like Figure 9 As shown, when the difference in radii of curvature R4-R2 is greater than 0 and less than 60 μm, a value greater than or equal to the Q value of the inductor component of Example 1 can be obtained.

[0109] Figure 10 Points P1 to P6 in the diagram represent the Q values ​​measured for the inductor components of Examples 1 to 6. Furthermore, Figure 10 The horizontal axis represents the wiring spacing S2 of the bends 82 and 86, and the vertical axis represents the Q value. By making the wiring spacing S2 larger than the wiring spacing S1, the Q value of the inductor component is improved. However, from the viewpoint of Q value, it is preferable that the wiring spacing S2 is 22 μm or more and 82 μm or less.

[0110] Figure 11 Points P1 to P6 in the diagram represent the Q values ​​measured for the inductor components of Examples 1 to 6 described above. Furthermore, Figure 11 The horizontal axis represents the ratio S2 / S1 of the wiring spacing S2 of the curved portions 82 and 86 to the wiring spacing S1 of the straight portions 72 and 76, and the vertical axis represents the Q value. If the ratio S2 / S1 increases, the Q value of the inductor component can be improved, but from the viewpoint of Q value, it is preferable that the ratio S2 / S1 is 1 or more and 3.7 or less.

[0111] As described above, this embodiment achieves the following effects.

[0112] (1) The inductor component 1 has a rectangular parallelepiped-shaped base 10 having a first side surface 13, and spiral-shaped coil conductor layers 41 to 48 wound more than one turn in a main surface parallel to the first side surface 13 in the base 10. The wiring interval S1 of two adjacent wiring portions (straight portions 71, 75) in a first direction Al from the inner side toward the outer side of the coil conductor layers 41 to 48 is different from the wiring interval S2 of two adjacent wiring portions (bent portions 82, 86) in a second direction A2 from the inner side toward the outer side of the coil conductor layer 48.

[0113] In the two adjacent wiring portions, the magnetic fluxes generated by the currents flowing in each of the wiring portions cancel each other out. According to the above-described structure, since the wiring intervals of the two adjacent wiring portions are different, the portions in which the cancellation of the magnetic fluxes of each other is reduced, and thus the efficiency of obtaining characteristics is improved.

[0114] (2) The number of turns of the coil conductor layers 41 to 48 is more than one turn and less than two turns. The annular tracks Ol, O2 are rectangular shapes. The straight portions 71 to 77 forming the outer peripheral track Ol and the inner peripheral track O2 can increase the outer shape of the coil portion 40a and can extend the length (circumference) of the coil portion 40a. Furthermore, the inner side of the coil portion 40a can be increased. Thus, the Q value of the inductor component 1 can be improved.

[0115] (Alterations)

[0116] Furthermore, the above-described embodiments can be implemented in the following manner.

[0117] • The shapes of the tracks Ol, O2 in the above-described embodiments can be appropriately altered.

[0118] As shown in Figure 12 (a), the outer peripheral track Ol and the inner peripheral track O2 can be formed in oblong shapes (shapes in which a circular arc shape and a straight line shape are combined). In addition, as shown in Figure 12 (b), the outer peripheral track Ol can be formed in an elliptical shape and the inner peripheral track O2 can be formed in a circular shape. Furthermore, the shapes of the outer peripheral track Ol and the inner peripheral track O2 can be rectangular shapes, polygonal shapes, oblong shapes, elliptical shapes, or combinations of a plurality of these shapes, or the like. In addition, the shape of the outer peripheral track Ol and the shape of the inner peripheral track O2 can be different. For example, the outer peripheral track Ol can be a shape bent along the outer conductor layer, and the inner peripheral track O2 can be a circular shape, an elliptical shape.

[0119] • For the above-described embodiments, the number of turns of the coil conductor layers can be more than one turn, and can be appropriately altered to be a number more than two turns, such as three turns, four turns, or the like. In addition, in one inductor component, coil conductor layers having different numbers of turns can be included.

[0120] • In the above-described embodiments, the number of layers of the insulator layer, the coil conductor layer, and the external conductor layer can also be changed as appropriate.

[0121] • In the above-described embodiments, the base layer 21 of the first external electrode 20 and the base layer 31 of the second external electrode 30 are embedded in the base 10, but can also be provided outside the base 10.

[0122] Explanation of Reference Numerals

[0123] 10…base, 20…first external electrode, 30…second external electrode, 40…coil, 40a…coil portion, 40b…first lead conductor layer, 40c…second lead conductor layer, 41-48…coil conductor layer, 60, 61, 62, 63a-63h, 64, 65…insulator layer, 71-77…straight portion (wiring portion, first straight portion, second straight portion), 81-86…bent portion (wiring portion, first corner portion, second corner portion), Al, A2…straight line, Ol…outer peripheral track (first track), O2…inner peripheral track (second track).

Claims

1. An inductor component comprising: A rectangular prism-shaped base having a first lateral surface; and The spiral coil conductor layer, within the aforementioned substrate, is wound more than one turn on a main surface parallel to the aforementioned first side surface. Viewed from a direction orthogonal to the first side, the coil conductor layer includes a wiring portion along a first annular track and a wiring portion along a second annular track that is more inward than the first track. The aforementioned first track has a shape having two or more first straight sections and first corner sections connecting the aforementioned first straight sections to each other. The coil conductor layer has a via pad located at a position corresponding to the first corner, and a wiring portion that is inclined to connect the wiring portion along the first track and the wiring portion along the second track in order to avoid the via pad. In the second direction from the inside of the coil conductor layer to the outside of the coil conductor layer, two adjacent wiring portions are both arc-shaped bends, and the radius of curvature R4 of the inner bend is larger than the radius of curvature R2 of the outer bend.

2. The inductor component according to claim 1, wherein, The aforementioned second track includes two or more second straight sections parallel to the aforementioned first straight section and second corner sections connecting the aforementioned second straight sections to each other.

3. The inductor component according to claim 2, wherein, The first wiring interval between the first straight section and the second straight section is less than or equal to the second wiring interval between the first corner section and the second corner section.

4. The inductor component according to claim 3, wherein, The second wiring spacing mentioned above is 22μm or more and 82μm or less.

5. The inductor component according to claim 3 or 4, wherein, The ratio of the second wiring interval S2 to the first wiring interval S1, S2 / S1, is 1 or more and 3.7 or less.

6. The inductor component according to claim 1, wherein, The difference between the radius of curvature R4 of the inner curved portion and the radius of curvature R2 of the outer curved portion is 0 or more and 60 μm or less.

7. The inductor component according to any one of claims 1 to 4, wherein, There are multiple coil conductor layers as described above. Viewed from a direction orthogonal to the first side, portions of the plurality of coil conductor layers overlap to form the first track and the second track.

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