inductor component

Abstract

The present application provides an inductor component capable of reducing the parasitic capacitance between a coil and an external electrode. The inductor component includes a core, a coil, a first external electrode, and a second external electrode. The core has a first end surface and a second end surface at both end sides in a length direction. The first external electrode and the second external electrode are respectively provided at the first end surface side and the second end surface side with respect to the center of the length direction of the core and are exposed from the outer surface of the core. At least a part of the portion of the first external electrode exposed from the outer surface of the core and at least a part of the portion of the second external electrode exposed from the outer surface of the core do not overlap each other when viewed from the first end surface side in the length direction. The center of gravity of the area of the portion of the first external electrode exposed from the outer surface of the core and the center of gravity of the area of the portion of the second external electrode exposed from the outer surface of the core are located on opposite sides with respect to the center of the width direction of the core.

Description

TECHNICAL FIELD

[0001] The present application relates to an inductor component. BACKGROUND

[0002] In the past, as an inductor component, a component described in Japanese Patent Application Publication No. 11-251146 (Patent Literature 1) has been known. The inductor component has a body having a length, a width, and a height; a coil provided inside the body and wound along an axial direction; and a first external electrode and a second external electrode provided to the body and electrically connected to the coil. The body has a first end surface and a second end surface located at both ends in the length direction, a first side surface and a second side surface located at both ends in the width direction, and a bottom surface and a top surface located at both ends in the height direction.

[0003] The first external electrode is provided to an entire surface of the first end surface, and a part of each of the first side surface, the second side surface, the bottom surface, and the top surface. The second external electrode is provided to an entire surface of the second end surface, and a part of each of the first side surface, the second side surface, the bottom surface, and the top surface.

[0004] Patent Literature 1: Japanese Patent Application Publication No. 11-251146

[0005] However, in the inductor component as described above, since the first external electrode and the second external electrode are so-called 5-surface electrodes, the first external electrode and the second external electrode are increased, and the parasitic capacitance between the coil and the first external electrode and the second external electrode is increased. SUMMARY

[0006] Therefore, the present disclosure aims to provide an inductor component capable of reducing the parasitic capacitance between the coil and the external electrode.

[0007] In order to solve the above problem, an inductor component according to one embodiment of the present disclosure includes:

[0008] a body having a length, a width, and a height;

[0009] a coil provided to the body and wound along an axial direction; and

[0010] a first external electrode and a second external electrode provided to the body and electrically connected to the coil,

[0011] the body has a first end surface and a second end surface located at both ends in the length direction, a first side surface and a second side surface located at both ends in the width direction, and a bottom surface and a top surface located at both ends in the height direction,

[0012] The first external electrode is provided on the first end surface side with respect to the center in the length direction of the blank so as to be exposed from the outer surface of the blank,

[0013] The second external electrode is provided on the second end surface side with respect to the center in the length direction of the blank so as to be exposed from the outer surface of the blank,

[0014] At least a part of the portion of the first external electrode exposed from the outer surface of the blank and at least a part of the portion of the second external electrode exposed from the outer surface of the blank do not overlap each other when viewed from the first end surface side in the length direction,

[0015] The center of gravity of the area of the portion of the first external electrode exposed from the outer surface of the blank and the center of gravity of the area of the portion of the second external electrode exposed from the outer surface of the blank are located on opposite sides with respect to the center in the width direction of the blank when viewed from the first end surface side in the length direction.

[0016] Here, the center of gravity of the area of the external electrode refers to the center position when the distribution of the area of the external electrode in the width direction of the blank is taken when viewed from the first end surface side in the length direction of the blank. For example, in the case where the external electrode is composed of two figures A and B, when the area of the figure A is assumed to be Sa, the position of the center of gravity of the figure A in the width direction of the blank is assumed to be Xa, and the area of the figure B is assumed to be Sb and the position of the center of gravity of the figure B in the width direction of the blank is assumed to be Xb, the center of gravity X of the area of the external electrode is calculated as X = (Sa x Xa + Sb x Xb) / (Sa + Sb).

[0017] Further, the "outer surface of the blank" including the first end surface, the second end surface, the first side surface, the second side surface, the bottom surface, and the top surface of the blank does not only refer to the surface facing the outer peripheral side of the blank, but also refers to the surface that becomes the boundary between the outer side and the inner side of the blank. Further, the "upper side of the outer surface of the blank" is not an absolute one direction in the direction of gravity like the vertical upper side, but refers to the direction toward the outer side among the outer side and the inner side with the outer surface as the boundary. Therefore, the "upper side of the outer surface" is a relative direction specified by the direction of the outer surface. Further, for a certain element, the "upper side (above)" includes not only the position above the element, i.e., the position above the element via the upper side of another object on the element, the position above the element with the interval pulled apart, but also the position on the element.

[0018] According to the above-described embodiment, since at least a part of the first external electrode and the second external electrode do not overlap each other when viewed from the first end surface side in the length direction of the blank, the first external electrode and the second external electrode can be reduced, and the parasitic capacitance between the coil and the first external electrode and the second external electrode can be reduced.

[0019] Further, since the center of gravity of the area of the first external electrode and the center of gravity of the area of the second external electrode are located on opposite sides with respect to the center of the width direction of the blank when viewed from the first end surface side in the length direction of the blank, when the first external electrode and the second external electrode of the inductor component are connected to the mounting substrate via solder with the bottom surface of the blank facing the mounting substrate, the inclination and the rotation of the inductor component with respect to the mounting substrate can be reduced, and the stable mounting posture of the inductor component can be ensured.

[0020] Preferably, in one embodiment of the inductor component,

[0021] The above-described blank includes a substrate and an insulating layer, wherein the substrate has a bottom surface and a top surface on both end sides in the height direction, the insulating layer covers each of the bottom surface and the top surface of the substrate,

[0022] The above-described coil includes a bottom surface wiring, a top surface wiring, and a pair of through wirings, wherein the bottom surface wiring is disposed above the bottom surface of the substrate and is covered by the insulating layer, the top surface wiring is disposed above the top surface of the substrate and is covered by the insulating layer, the pair of through wirings penetrates the substrate across the bottom surface and the top surface, and are disposed on opposite sides with respect to the axis, and the bottom surface wiring, a first through wiring of the pair of through wirings, the top surface wiring, and a second through wiring of the pair of through wirings are sequentially connected to constitute at least a part of the coil wound along the axis.

[0023] According to the above-described embodiment, since the coil is a so-called spiral-shaped coil, in a cross section orthogonal to the axis, the area in which the bottom surface wiring, the top surface wiring, and the through wirings are parallel along the winding direction of the coil can be reduced, and the parasitic capacitance in the coil can be reduced.

[0024] Preferably, in one embodiment of the inductor component, the first external electrode is provided continuously with the bottom surface at the first end surface, and the second external electrode is provided continuously with the bottom surface at the second end surface.

[0025] According to the above-described embodiment, since the first external electrode and the second external electrode are electrodes in a so-called L shape, when the inductor component is mounted to a mounting substrate, a solder fillet can be formed in the first external electrode and the second external electrode. Thus, the mounting strength of the inductor component can be improved, and in addition, the mounting posture of the inductor component can be further stabilized.

[0026] Preferably, in one embodiment of the inductor component,

[0027] the first external electrode is provided continuously with the first end surface and the bottom surface,

[0028] when viewed from the first end surface side in the length direction, the first end surface portion of the first external electrode provided on the first end surface exists on the same side as the through wiring connecting the first external electrode with respect to the center of the width direction of the green compact.

[0029] According to the above-described embodiment, since the length of the extension from the first end surface portion of the first external electrode to the extension portion of the through wiring can be shortened, the first external electrode can be reduced, and the parasitic capacitance between the coil and the first external electrode can be reduced.

[0030] Preferably, in one embodiment of the inductor component, when viewed from the first end surface side in the length direction, the first end surface portion of the first external electrode provided on the first end surface and the second end surface portion of the second external electrode provided on the second end surface do not overlap each other.

[0031] Here, the so-called first end surface portion and the second end surface portion not overlapping each other also includes a case where at least one of the first end surface portion and the second end surface portion is not formed at all.

[0032] According to the above-described embodiment, the first external electrode and the second external electrode can be further reduced, and the parasitic capacitance between the coil and the first external electrode and the second external electrode can be further reduced.

[0033] Preferably, in one embodiment of the inductor component,

[0034] the first external electrode is provided continuously with the first end surface and the bottom surface,

[0035] when viewed from the first end surface side in the length direction, the first end surface portion of the first external electrode provided on the first end surface has three or more regions different in size in the width direction along the height direction.

[0036] Here, the so-called size in the width direction means the maximum value in the width direction.

[0037] According to the above embodiment, the shape of the first external electrode can be optimized, and the amount of solder fillet can be controlled.

[0038] Preferably, in one embodiment of the inductor component, the size of the width direction of the above three or more regions of the above first end surface portion alternately changes along the height direction.

[0039] According to the above embodiment, by taking into account the processing deviation when each region is laminated, positional deviation between the regions can be prevented, and electrical connection between the regions can be ensured.

[0040] Preferably, in one embodiment of the inductor component, the above three or more regions of the above first end surface portion each have a side edge on both end sides in the width direction, and the inclination angle of the above side edge with respect to the height direction, as viewed from the length direction, is different in all the regions.

[0041] According to the above embodiment, by taking into account the processing deviation when each region is laminated, positional deviation between the regions can be prevented, and electrical connection between the regions can be ensured.

[0042] Preferably, in one embodiment of the inductor component, the first end surface portion of the first external electrode provided on the first end surface and the second end surface portion of the second external electrode provided on the second end surface do not overlap the axis of the coil.

[0043] According to the above embodiment, the first end surface portion and the second end surface portion can reduce the obstruction of the magnetic flux of the coil, and the efficiency of obtaining inductance can be improved.

[0044] Preferably, in one embodiment of the inductor component, as viewed from the axis of the coil, the first end surface portion and the second end surface portion do not overlap the inner diameter portion of the coil.

[0045] According to the above embodiment, the first end surface portion and the second end surface portion can further reduce the obstruction of the magnetic flux of the coil, and the efficiency of obtaining inductance can be further improved.

[0046] Preferably, in one embodiment of the inductor component, the size of the height direction of the first end surface portion of the first external electrode provided on the first end surface and the size of the height direction of the second end surface portion of the second external electrode provided on the second end surface are more than half of the size of the height direction of the blank.

[0047] Here, the size of the height direction refers to the maximum value in the height direction.

[0048] According to the above-described embodiment, the mounting strength of the first external electrode and the second external electrode based on the solder fillet can be improved.

[0049] Preferably, in one embodiment of the inductor component,

[0050] The first external electrode is provided continuously on the first end surface and the bottom surface,

[0051] At least a portion of the first end surface portion of the first external electrode provided on the first end surface protrudes from the first end surface.

[0052] According to the above-described embodiment, since at least a portion of the first end surface portion protrudes from the first end surface, the mountability of the first external electrode can be good. In addition, the electrical characteristics can be easily obtained at the time of characteristic selection in a later process.

[0053] Preferably, in one embodiment of the inductor component,

[0054] The first external electrode and the second external electrode are provided only on the bottom surface,

[0055] At least a portion of the first external electrode and at least a portion of the second external electrode protrude from the bottom surface to the outside of the green body.

[0056] According to the above-described embodiment, since the first external electrode and the second external electrode are provided only on the bottom surface, the first external electrode and the second external electrode can be further reduced, and the parasitic capacitance between the coil and the first external electrode and the second external electrode can be further reduced.

[0057] In addition, since at least a portion of the first external electrode and at least a portion of the second external electrode protrude from the bottom surface, the mountability of the first external electrode and the second external electrode can be good. In addition, the electrical characteristics can be easily obtained at the time of characteristic selection in a later process.

[0058] Preferably, in one embodiment of the inductor component, the green body includes a single-layer glass plate.

[0059] Here, the so-called single-layer glass plate is a concept with respect to a laminated glass body, and more specifically, refers to a conductor integrated in glass, that is, a plate of glass in which an internal conductor is not introduced to the inside.

[0060] According to the above-described embodiment, the strength of the green sheet can be ensured. In addition, in the case of a single-layer glass sheet, the Q value at high frequencies can be improved because the dielectric loss is small. In addition, because there is no sintering process like a sintered body, the deformation of the green sheet at the time of sintering can be suppressed, and thus the pattern shift can be suppressed, and an inductor component with a small inductance tolerance can be provided.

[0061] Preferably, in one embodiment of the inductor component, a part of the outer surface of the above-described green sheet is composed of a material different from the other outer surfaces.

[0062] According to the above-described embodiment, the color of a part of the outer surface of the green sheet can be changed, and the structure of the inside of the green sheet can be prevented from being seen through, or the like. Alternatively, a part of the outer surface of the green sheet can be used as a mark, and the inductor component can be given directionality.

[0063] Preferably, in one embodiment of the inductor component, the volume of the above-described inductor component is 0.08 mm 3 Hereinafter, and the size of the long side of the above-described inductor component is 0.65 mm or less.

[0064] Here, the size of the long side of the inductor component refers to the largest value among the length, the width, and the height of the inductor component.

[0065] According to the above-described embodiment, because the volume of the inductor component is small, and the long side of the inductor component is also small, the weight of the inductor component is reduced. Therefore, even if the external electrode is reduced, the required mounting strength can be obtained.

[0066] Preferably, in one embodiment of the inductor component, when viewed in the above-described height direction, the above-described first external electrode and the above-described second external electrode do not overlap the above-described coil.

[0067] According to the above-described embodiment, and the parasitic capacitance between the coil and the first external electrode and the second external electrode can be reduced.

[0068] Preferably, in one embodiment of the inductor component, when viewed from the above-described first end surface side in the above-described length direction, the area of the part of the above-described first external electrode that protrudes from the outer surface of the green sheet and the area of the part of the above-described second external electrode that protrudes from the outer surface of the green sheet are equal to each other.

[0069] According to the above-described embodiment, because the amount of solder used for the mounting of the inductor component in the first external electrode and the second external electrode can be made equal, the posture of the inductor component can be made more stable.

[0070] According to the inductor component of one embodiment of the present disclosure, the parasitic capacitance between the coil and the external electrode can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 is a schematic perspective view of the inductor component as viewed from the bottom surface side.

[0072] Figure 2 is a schematic bottom view of the inductor component as viewed from the bottom surface side.

[0073] Figure 3 is a schematic end view of the inductor component as viewed from the first end surface side.

[0074] Figure 4A is a schematic end view of the inductor component as viewed from the first end surface side.

[0075] Figure 4B is a schematic end view of the inductor component as viewed from the second end surface side.

[0076] Figure 5 is a schematic view showing a modification of the first external electrode as viewed from the first end surface side.

[0077] Figure 6A is a schematic sectional view for explaining a manufacturing method of the inductor component.

[0078] Figure 6B is a schematic sectional view for explaining a manufacturing method of the inductor component.

[0079] Figure 6C is a schematic sectional view for explaining a manufacturing method of the inductor component.

[0080] Figure 6D is a schematic sectional view for explaining a manufacturing method of the inductor component.

[0081] Figure 6E is a schematic sectional view for explaining a manufacturing method of the inductor component.

[0082] Figure 6F is a schematic sectional view for explaining a manufacturing method of the inductor component.

[0083] Figure 6G is a schematic sectional view for explaining a manufacturing method of the inductor component.

[0084] Figure 6H is a schematic sectional view for explaining a manufacturing method of the inductor component.

[0085] Figure 7A is a schematic end view of the first modification of the inductor component as viewed from the first end surface side.

[0086] Figure 7Bis a schematic end view of the inductor component of the first modification as viewed from the second end face side.

[0087] Figure 7C is a schematic end view of the inductor component of the first modification as viewed from the first end face side.

[0088] Figure 8A is a schematic end view of the inductor component of the second modification as viewed from the first end face side.

[0089] Figure 8B is a schematic end view of the inductor component of the second modification as viewed from the second end face side.

[0090] Figure 9A is a schematic end view of the inductor component of the third modification as viewed from the first end face side.

[0091] Figure 9B is a schematic end view of the inductor component of the third modification as viewed from the second end face side.

[0092] Figure 9C is a schematic end view of the inductor component of the third modification as viewed from the first end face side.

[0093] Figure 10 is a schematic end view of the inductor component of the second embodiment as viewed from the first end face side.

[0094] Explanation of Reference Signs

[0095] 1, 1B, 1C, 1D, 1E…inductor component; 10…green sheet; 11b…bottom surface wiring; 11t…top surface wiring; 13…first through wiring; 14…second through wiring; 21…substrate; 22…insulating layer; 100…outer surface; 100b…bottom surface; 100t…top surface; 100s1…first side surface; 100s2…second side surface; 100e1…first end surface; 100e2…second end surface; 110…coil; 121, 121A, 121B, 121D, 121E…first external electrode; 121t…first bottom surface portion; 121e…first end surface portion; 121e1…first portion; 121e2…second portion; 121e3…third portion; 121f…first additional portion; 122, 122B, 122D, 122E…second external electrode; 122t…second bottom surface portion; 122e…second end surface portion; 122e1…first portion; 122e2…second portion; 122e3…third portion; 122f…second additional portion; 131…first dummy terminal; 132…second dummy terminal; b1…first side edge; b2…second side edge; b3…third side edge; AX…axis; M…center in the width direction of the green sheet; V…via hole; W11…first width of the first end surface portion; W12…second width of the first end surface portion; W13…third width of the first end surface portion; W21…first width of the second end surface portion; W22…second width of the second end surface portion; W23…third width of the second end surface portion. DETAILED DESCRIPTION

[0096] Hereinafter, an inductor component according to one embodiment of the present disclosure will be described through an illustrated embodiment. Furthermore, the drawings contain partially schematic structures, and there are cases where actual dimensions, ratios are not reflected.

[0097] <First Embodiment>

[0098] Hereinafter, the inductor component 1 of the first embodiment will be described. Figure 1 is a mode perspective view of the inductor component 1 as viewed from the bottom surface side. Figure 2 is a schematic bottom view of the inductor component 1 as viewed from the bottom surface side. Figure 3 is a schematic end surface view of the inductor component 1 as viewed from the first end surface side. Furthermore, in Figure 2 , for convenience, the insulating layer that depicts the green sheet is omitted, and a part (bottom surface portion) of the external electrode is depicted with a double-dot chain line.

[0099] 1. Outline structure

[0100] The outline structure of the inductor component 1 will be described. The inductor component 1 is, for example, a surface mount type inductor component used for a high frequency signal transmission circuit. As Figure 1 and Figure 2As shown, the inductor component 1 includes a base body 10, a coil 110 provided on the base body 10 and wound along an axis AX, and a first external electrode 121 and a second external electrode 122 provided on the base body 10 and electrically connected to the coil 110. The axis AX of the coil 110 is a straight line passing through the center of the inner diameter portion of the coil 110. The axis AX of the coil 110 has no dimension in a direction perpendicular to the axis AX.

[0101] The blank 10 has a length, a width, and a height. It has a first end face 100e1 and a second end face 100e2 located at either end in the length direction, a first side face 100s1 and a second side face 100s2 located at either end in the width direction, and a bottom face 100b and a top face 100t located at either end in the height direction. In other words, the outer surface 100 of the blank 10 includes the first end face 100e1 and the second end face 100e2, the first side face 100s1 and the second side face 100s2, the bottom face 100b, and the top face 100t.

[0102] As shown in the accompanying drawings, for ease of explanation, the length direction (longitudinal direction) of the blank 10, which is the direction from the first end face 100e1 toward the second end face 100e2, is referred to as the X direction. Furthermore, the width direction of the blank 10, which is the direction from the first side face 100s1 toward the second side face 100s2, is referred to as the Y direction. Furthermore, the height direction of the blank 10, which is the direction from the bottom face 100b toward the top face 100t, is referred to as the Z direction. The X, Y, and Z directions are mutually orthogonal and, when arranged in the order of X, Y, and Z, form a right-handed system.

[0103] The first external electrode 121 is provided on the first end face 100e1 side relative to the center of the body 10 in the X direction so as to be exposed from the outer surface 100 of the body 10. The second external electrode 122 is provided on the second end face 100e2 side relative to the center of the body 10 in the X direction so as to be exposed from the outer surface 100 of the body 10.

[0104] like Figure 3 As shown, when viewed from the first end surface 100e1 side in the X direction, at least a portion of the first external electrode 121 exposed from the outer surface 100 of the green body 10 and at least a portion of the second external electrode 122 exposed from the outer surface 100 of the green body 10 do not overlap with each other. Figure 3 In FIG. 1 , for convenience, the exposed portion of the first external electrode 121 is indicated by a solid oblique line, and the exposed portion of the second external electrode 122 is indicated by a dotted oblique line.

[0105] In addition, when viewed from the first end surface 100e1 side in the X direction, the area of ​​the portion of the first external electrode 121 exposed from the outer surface 100 of the body 10 ( Figure 3the center of gravity of the area of the second external electrode 122 (the area of the region indicated by the slanting line of the broken line) is located on the opposite side with respect to the center M of the Y direction of the blank 10. In other words, the center of gravity of the area of the exposed portion of the first external electrode 121 when viewed from the first end surface 100el side in the X direction and the center of gravity of the area of the exposed portion of the second external electrode 122 when viewed from the second end surface 100e2 side in the X direction are located on the same side with respect to the center M of the Y direction of the blank 10. Figure 3

[0106] According to the above structure, since at least a part of the first external electrode 121 and the second external electrode 122 do not overlap each other when viewed from the first end surface 100el side in the X direction of the blank 10, the first external electrode 121 and the second external electrode 122 can be reduced in size, and the parasitic capacitance between the coil 110 and the first external electrode 121 and the second external electrode 122 can be reduced.

[0107] Further, since the center of gravity of the area of the first external electrode 121 and the center of gravity of the area of the second external electrode 122 are located on opposite sides with respect to the center M of the Y direction of the blank 10 when viewed from the first end surface 100el side in the X direction of the blank 10, when the first external electrode 121 and the second external electrode 122 of the inductor component 1 are connected to the mounting substrate via solder with the bottom surface 100b of the blank 10 facing the mounting substrate, the inclination and the rotation of the inductor component 1 with respect to the mounting substrate can be reduced, and the stable mounting posture of the inductor component can be ensured.

[0108] 2. Structures of the respective parts

[0109] (Inductor component 1)

[0110] The volume of the inductor component 1 is 0.08 mm 3 Hereinafter, the size of the long side of the inductor component 1 is 0.65 mm or less. The size of the long side of the inductor component 1 refers to the largest value among the length, the width, and the height of the inductor component 1, and in the present embodiment, refers to the length in the X direction. According to the above structure, since the volume of the inductor component 1 is small, and the size of the long side of the inductor component 1 is also small, the weight of the inductor component 1 is reduced. Therefore, even if the external electrodes 121 and 122 are small, the required mounting strength can be obtained.

[0111] ​If specifically described, the size (length (X direction) x width (Y direction) x height (Z direction)) of the inductor component 1 is 0.6 mm x 0.3 mm x 0.3 mm, 0.4 mm x 0.2 mm x 0.2 mm, 0.25 mm x 0.125 mm x 0.120 mm, or the like. In addition, the width and the height can also be unequal, for example, 0.4 mm x 0.2 mm x 0.3 mm, or the like.

[0112] (blank 10)

[0113] The blank 10 has a substrate 21 having a bottom surface 21b and a top surface 21t on both end sides in the Z direction, and an insulating layer 22 covering each of the bottom surface 21b and the top surface 21t of the substrate 21. In addition, the insulating layer 22 can be provided only on the bottom surface 21b among the bottom surface 21b and the top surface 21t.

[0114] The blank 10 preferably includes a single-layer glass plate. In other words, the substrate 21 is preferably a single-layer glass plate. Thereby, the strength of the blank 10 can be ensured. In addition, in the case of a single-layer glass plate, the Q value at high frequencies can be improved because the dielectric loss is small. In addition, since there is no sintering process like a sintered body, deformation of the blank 10 at the time of sintering can be suppressed, and thus pattern shift can be suppressed, and an inductor component with a small inductance tolerance can be provided.

[0115] As a material of the single-layer glass plate, from the viewpoint of the manufacturing method, a glass plate having photosensitivity typified by Foturan II (registered trademark of Schott AG) is preferable. In particular, the single-layer glass plate preferably contains Ceria (CeO2), and in this case, Ceria becomes a sensitizer, and processing using photolithography becomes easier.

[0116] However, since the single-layer glass plate can be processed by mechanical processing such as drilling and sandblasting, dry / wet etching processing using a photoresist / metal mask, laser processing, and the like, it can also be a glass plate without photosensitivity. In addition, the single-layer glass plate can be sintered from a glass paste, or can be formed by a known method such as a float method.

[0117] The single-layer glass plate is a single-layer plate-shaped member that does not introduce an internal conductor or the like wiring (part of the coil 110) integrated inside the glass body. In particular, the single-layer glass plate has an outer surface that is a boundary between the outside and the inside of the glass body. Since the via hole V formed in the single-layer glass plate is also a boundary between the outside and the inside of the glass body, it is also included in the outer surface 100 of the blank 10.

[0118] The single-layer glass plate is substantially in an amorphous state, but can also have a crystalline portion. For example, in the case of Foturan II described above, the dielectric constant of the glass in the amorphous state is 6.4, and by crystallization, the dielectric constant can be reduced to 5.8. Thus, the parasitic capacitance between the conductors (wires) in the vicinity of the crystalline portion can be reduced.

[0119] The insulating layer 22 protects the wires from external forces by covering the wires (part of the coil 110), and is a component that has a function of preventing damage to the wires and a function of improving the insulation of the wires. The insulating layer 22 is preferably an inorganic film such as an oxide, nitride, or oxynitride of silicon, hafnium, or the like, which is excellent in insulation and thin film formation. However, the insulating layer 22 can also be a resin film such as an epoxy resin or polyimide, which is easier to form. In particular, the insulating layer 22 is preferably composed of a material with a low dielectric constant, whereby when the insulating layer 22 is present between the coil 110 and the external electrodes 121, 122, the parasitic capacitance formed between the coil 110 and the external electrodes 121, 122 can be reduced.

[0120] The insulating layer 22 can be formed, for example, by laminating a resin film such as ABF GX-92 (manufactured by Ajinomoto Fine Techno Co., Ltd.), or by applying a paste-like resin and thermally curing it.

[0121] Preferably, a part of the outer surface 100 of the blank 10 is composed of a material different from the other outer surfaces 100. According to the above structure, the color of a part of the outer surface 100 of the blank 10 can be changed, and the inside structure of the blank 10 can be prevented from being seen through, or the like. Alternatively, a part of the outer surface 100 of the blank 10 can be used as a mark, and the inductor component 1 can be given directionality. Further, the different material includes a portion of the blank 10 in which the glass is modified (modified layer).

[0122] Further, the blank 10 can include a sintered body, in other words, the substrate 21 can be a sintered body, and the strength of the blank 10 can be ensured. In addition, by using a ferrite or the like for the sintered body, the efficiency of obtaining the inductance can be improved.

[0123] (coil 110)

[0124] The coil 110 has a bottom surface wire 11b disposed above the bottom surface 21b of the substrate 21 and covered by the insulating layer 22, a top surface wire 11t disposed above the top surface 21t of the substrate 21 and covered by the insulating layer 22, and a pair of through wires 13, 14 that penetrate the substrate 21 throughout the bottom surface 21b and the top surface 21t and are disposed on opposite sides of each other with respect to the axis AX. The bottom surface wire 11b, the first through wire 13, the top surface wire 11t, and the second through wire 14 are connected in this order to constitute at least a part of the coil 110 wound in the direction of the axis AX.

[0125] According to the above structure, since the coil 110 is a so-called spiral-shaped coil 110, in a cross section orthogonal to the axis AX, the region in which the bottom surface wiring 11b, the top surface wiring 11t, and the through wirings 13, 14 are parallel along the winding direction of the coil 110 can be reduced, and the parasitic capacitance in the coil 110 can be reduced.

[0126] Here, the so-called spiral shape refers to a shape in which the number of turns of the coil as a whole is greater than 1 turn, and the number of turns of the coil in a cross section orthogonal to the axis is less than 1 turn. The so-called 1 turn or more refers to a state in which the wiring of the coil has a portion that is adjacent in the radial direction and is parallel in the winding direction as viewed from the axis in a cross section orthogonal to the axis, and the so-called less than 1 turn refers to a state in which the wiring of the coil does not have a portion that is adjacent in the radial direction and is parallel in the winding direction as viewed from the axis in a cross section orthogonal to the axis. Furthermore, the portion in which the wirings are parallel includes not only an extension portion that extends in the winding direction of the wiring, but also a land portion having a width greater than the width of the extension portion connected to the end portion of the extension portion.

[0127] The top surface wiring 11t is in a shape extending in the Y direction. A plurality of top surface wirings 11t are arranged in parallel along the X direction. The bottom surface wiring 11b is slightly inclined to the X direction and extends in the Y direction. A plurality of bottom surface wirings 11b are arranged in parallel along the X direction.

[0128] The first through wiring 13 is arranged on the first side surface 100s1 side with respect to the axis AX within the through hole V of the blank 10, and the second through wiring 14 is arranged on the second side surface 100s2 side with respect to the axis AX within the through hole V of the blank 10. The first through wiring 13 and the second through wiring 14 respectively extend in a direction orthogonal to the bottom surface 21b and the top surface 21t (the bottom surface 100b and the top surface 100t). A plurality of first through wirings 13 and a plurality of second through wirings 14 are respectively arranged in parallel along the X direction.

[0129] The bottom surface wiring 11b and the top surface wiring 11t are made of a good conductor material such as copper, silver, gold, or an alloy of these metals. The bottom surface wiring 11b and the top surface wiring 11t can be a metal film formed by electroplating, evaporation, sputtering, or the like, or a metal sintered body in which a conductor paste is applied and sintered. In addition, the bottom surface wiring 11b and the top surface wiring 11t can be a multilayer structure in which a plurality of metal layers are stacked. The thickness of the bottom surface wiring 11b and the top surface wiring 11t is preferably 5 μm or more and 50 μm or less.

[0130] Further, the bottom surface wiring 11b and the top surface wiring 11t are preferably formed by a semi-additive method, whereby the bottom surface wiring 11b and the top surface wiring 11t of low resistance, high precision, and high aspect ratio can be formed. For example, the bottom surface wiring 11b and the top surface wiring 11t can be formed as follows. First, a layer of titanium and a layer of copper are formed in order as seed layers on the entire outer surface 100 of the monolithicized blank 10 by a sputtering method or electroless plating, and a patterned photoresist is formed on the seed layers. Next, a layer of copper is formed on the seed layers in the opening of the photoresist by electrolytic plating. Thereafter, the photoresist and the seed layers are removed by wet etching or dry etching. Thereby, the bottom surface wiring 11b and the top surface wiring 11t patterned into an arbitrary shape can be formed on the outer surface 100 of the blank 10.

[0131] The first through wiring 13 and the second through wiring 14 can be formed in the through hole V formed in advance in the blank 10 using the materials and the method of formation exemplified in the bottom surface wiring 11b and the top surface wiring 11t.

[0132] Preferably, the axis AX of the coil 110 is parallel with respect to the bottom surface 100b of the blank 10. Thereby, in the case where the bottom surface 100b of the blank 10 is mounted with the mounting substrate opposing the inductor component 1, the obstruction of the magnetic flux of the coil 110 by the mounting substrate can be reduced, and the efficiency of obtaining inductance can be improved.

[0133] Further, the axis AX of the coil 110 can also be perpendicular with respect to the X direction, whereby the obstruction of the magnetic flux of the coil 110 by the first external electrode 121 and the second external electrode 122 can be reduced, and the efficiency of obtaining inductance can be improved. In addition, the axis AX of the coil 110 can also be perpendicular with respect to the bottom surface 100b of the blank 10, whereby the obstruction of the magnetic flux of the coil 110 by the first external electrode 121 and the second external electrode 122 can be reduced, and the efficiency of obtaining inductance can be improved.

[0134] (First external electrode 121 and second external electrode 122)

[0135] The first external electrode 121 is connected to the first end of the coil 110, and the second external electrode 122 is connected to the second end of the coil 110. The first external electrode 121 and the second external electrode 122 are each composed of a single layer of conductive material, or can also be composed of a plurality of layers of conductive material. In the case of a single layer of conductive material, for example, the same material as the coil 110 is used, and in the case of a plurality of layers of conductive material, for example, a base layer of the same material as the coil 110 and a plating layer covering the base layer are used.

[0136] Figure 4A is a schematic end surface view of the inductor component 1 as viewed from the first end surface 100el side. As shown in FIG. 1, the inductor component 1 is composed of the blank 10, the first through wiring 13, the second through wiring 14, the coil 110, the first external electrode 121, and the second external electrode 122.Figure 1 、 Figure 2 as well as Figure 4A As shown, a first external electrode 121 is provided continuously on the first end surface 100e1 and the bottom surface 100b. This configuration, because first external electrode 121 is a so-called L-shaped electrode, allows solder fillets to be formed on first external electrode 121 when the inductor component 1 is mounted on a mounting substrate. This improves the mounting strength of the inductor component 1 and further stabilizes the mounting posture of the inductor component 1.

[0137] The first external electrode 121 includes a first end surface portion 121e provided on the first end surface 100e1 and a first bottom surface portion 121t provided on the bottom surface 100b. The first end surface portion 121e is connected to the first bottom surface portion 121t. The first end surface portion 121e is embedded in the first end surface 100e1 so as to be exposed from the first end surface 100e1. The first bottom surface portion 121t is arranged on the bottom surface 100b so as to protrude from the bottom surface 100b. The first end surface portion 121e is connected to the second through-wiring 14 of the coil 110.

[0138] like Figure 4A As shown, when viewed from the first end face 100e1 side in the X direction, the first end face portion 121e of the first external electrode 121 is located on the same side as the second through-hole interconnection 14 connected to the first external electrode 121, relative to the center M in the Y direction of the base body 10. In other words, the first end face portion 121e is located on the second side face 100s2 side relative to the center M. Here, "located on the same side" includes not only the entire first end face portion 121e being located on the same side as the second through-hole interconnection 14 relative to the center M, but also the fact that more than half of the first end face portion 121e is located on the same side as the second through-hole interconnection 14 relative to the center M. In this embodiment, the center M intersects the axis AX.

[0139] According to the above structure, since the length of the extending portion extending from the first end surface portion 121e of the first external electrode 121 to the second through wiring 14 can be shortened, the first external electrode 121 can be reduced and the parasitic capacitance between the coil 110 and the first external electrode 121 can be reduced.

[0140] like Figure 4A As shown, when viewed from the first end surface 100e1 in the X direction, the first end surface portion 121e of the first external electrode 121 has three or more regions along the Z direction, each with different sizes in the Y direction. Between two adjacent regions in the Z direction, the size of one region in the Y direction differs in stages from that of the other region. This structure optimizes the shape of the first external electrode 121 and controls the amount of solder fillet.

[0141] Specifically, the first end surface portion 121e includes a first portion 121e1, a second portion 121e2, and a third portion 121e3, which are connected in sequence along the Z direction. The first portion 121e1 is connected to the first bottom surface portion 121t at the bottom surface 100b. The second portion 121e2 is connected to the second through-hole wiring 14 within the body 10. When viewed from the first end surface 100e1 side in the X direction, the first portion 121e1, the second portion 121e2, and the third portion 121e3 correspond to the aforementioned regions.

[0142] When viewed from the side of the first end face 100e1 in the X direction, the size of the first portion 121e1 in the Y direction (hereinafter referred to as the first width W11), the size of the second portion 121e2 in the Y direction (hereinafter referred to as the second width W12), and the size of the third portion 121e3 in the Y direction (hereinafter referred to as the third width W13) are different from each other.

[0143] When viewed from the first end surface 100e1 in the X direction, the first portion 121e1, the second portion 121e2, and the third portion 121e3 are rectangular. In other words, the first width W11 is constant along the Z direction of the first portion 121e1, the second width W12 is constant along the Z direction of the second portion 121e2, and the third width W13 is constant along the Z direction of the third portion 121e3. Furthermore, for example, if the size of the first portion 121e1 in the Y direction varies along the Z direction of the first portion 121e1, the maximum value of the first portion 121e1 in the Y direction is used as the first width W11.

[0144] like Figure 4A As shown, the size relationship of the three or more regions of the first end surface portion 121e in the Y direction changes alternately along the Z direction. According to the above structure, by taking into account the processing deviation when stacking the regions, positional deviation between the regions can be prevented and electrical connection between the regions can be ensured.

[0145] Specifically, the first width W11 is smaller than the second width W12, and the second width W12 is larger than the third width W13. In other words, the first width W11, second width W12, and third width W13 vary in size along the Z direction. For example, the first width W11 is 0.12 mm, the second width W12 is 0.132 mm, and the third width W13 is 0.05 mm. Furthermore, the size of the first bottom portion 121 t in the Y direction is larger than the first width W11. In this case, the size relationship of the first bottom portion 121 t, first portion 121 e 1, second portion 121 e 2, and third portion 121 e 3 in the Y direction alternates along the Z direction.

[0146] As shown in FIG. 1, the first external electrode 121 is provided on the first end surface 100el of the inductor component 1. The first external electrode 121 is formed in a so-called L-letter shape. The first external electrode 121 is formed of a conductive material such as copper or the like. The first external electrode 121 is formed by plating or the like. Figure 4A As shown in FIG. 1, the first end surface portion 121e of the first external electrode 121 does not overlap with the axis AX of the coil 110. According to the above structure, it is possible to reduce the hindrance of the first end surface portion 121e to the magnetic flux of the coil 110, and it is possible to improve the acquisition efficiency of the inductance.

[0147] Preferably, the first end surface portion 121e does not overlap with the inner diameter portion of the coil 110, as viewed in the axis AX direction of the coil 110. According to the above structure, it is possible to further reduce the hindrance of the first end surface portion 121e to the magnetic flux of the coil 110, and it is possible to further improve the acquisition efficiency of the inductance.

[0148] As shown in FIG. 1, the first end surface portion 121e of the first external electrode 121 is provided on the first end surface 100el of the inductor component 1. The first end surface portion 121e is formed in a so-called L-letter shape. The first end surface portion 121e is formed of a conductive material such as copper or the like. The first end surface portion 121e is formed by plating or the like. Figure 4A As shown in FIG. 1, the Z-direction size of the first end surface portion 121e of the first external electrode 121 is half or more of the Z-direction size of the blank 10, and more preferably 2 / 3 or more of the Z-direction size of the blank 10. According to the above structure, it is possible to improve the mounting strength of the first external electrode 121 based on the solder fillet.

[0149] Preferably, at least a part of the first end surface portion 121e of the first external electrode 121 protrudes from the first end surface 100el. According to the above structure, it is possible to make the mountability of the first external electrode 121 good. In addition, it is possible to easily acquire the electrical characteristics at the time of characteristic selection in the later process.

[0150] Figure 4B is a schematic end surface view of the inductor component 1 as viewed from the second end surface 100e2 side. In addition, the second external electrode 122 is the same structure as the first external electrode 121. Therefore, hereinafter, the same detailed portion will be omitted and described.

[0151] As shown in FIG. 1, the first end surface portion 121e of the first external electrode 121 is provided on the first end surface 100el of the inductor component 1. The first end surface portion 121e is formed in a so-called L-letter shape. The first end surface portion 121e is formed of a conductive material such as copper or the like. The first end surface portion 121e is formed by plating or the like. Figure 1 , Figure 2 and Figure 4B As shown in FIG. 1, the first end surface portion 121e of the first external electrode 121 is provided on the first end surface 100el of the inductor component 1. The first end surface portion 121e is formed in a so-called L-letter shape. The first end surface portion 121e is formed of a conductive material such as copper or the like. The first end surface portion 121e is formed by plating or the like.

[0152] The second external electrode 122 has a second end surface portion 122e provided on the second end surface 100e2 and a second bottom surface portion 122t provided on the bottom surface 100b. The second end surface portion 122e is connected to the second bottom surface portion 122t. The second end surface portion 122e is connected to the first through-wiring 13 of the coil 110.

[0153] As shown in FIG. 1, the first end surface portion 121e of the first external electrode 121 is provided on the first end surface 100el of the inductor component 1. The first end surface portion 121e is formed in a so-called L-letter shape. The first end surface portion 121e is formed of a conductive material such as copper or the like. The first end surface portion 121e is formed by plating or the like. Figure 4B ​As shown in FIG. 1, the second end surface portion 122e of the second external electrode 122 exists on the same side as the first through-wiring 13 to which the second external electrode 122 is connected with respect to the center M of the Y direction of the blank 10 when viewed from the second end surface 100e2 side in the X direction. In other words, the second end surface portion 122e exists on the first side surface 100s1 side with respect to the center M. According to the above-described structure, since it is possible to shorten the length of the extension portion extending from the second end surface portion 122e of the second external electrode 122 to the first through-wiring 13, it is possible to reduce the second external electrode 122 and to reduce the parasitic capacitance between the coil 110 and the second external electrode 122.

[0154] As shown in FIG. 1, the second end surface portion 122e of the second external electrode 122 has three or more regions different in size in the Y direction along the Z direction when viewed from the second end surface 100e2 side in the X direction. The size in the Y direction of one region and the size in the Y direction of another region are different in stages between two regions adjacent in the Z direction. According to the above-described structure, it is possible to optimize the shape of the second external electrode 122 and to control the amount of solder fillet. Figure 4B If described specifically, the second end surface portion 122e has a first portion 122e1, a second portion 122e2, and a third portion 122e3 connected in this order along the Z direction. The first portion 122e1 is connected to the second bottom surface portion 122t at the bottom surface 100b. The second portion 122e2 is connected to the first through-wiring 13 inside the blank 10.

[0155] The size in the Y direction of the first portion 122e1 (hereinafter, referred to as a first width W21), the size in the Y direction of the second portion 122e2 (hereinafter, referred to as a second width W22), and the size in the Y direction of the third portion 122e3 (hereinafter, referred to as a third width W23) are different from each other when viewed from the second end surface 100e2 side in the X direction.

[0156] As shown in FIG. 1, the sizes in the Y direction of the three or more regions of the second end surface portion 122e change alternately along the Z direction. According to the above-described structure, by taking into account the processing deviation at the time of laminating each region, it is possible to prevent positional deviation between the regions and to ensure electrical connection between the regions.

[0157] Figure 4B If described specifically, the second end surface portion 122e has a first portion 122e1, a second portion 122e2, and a third portion 122e3 connected in this order along the Z direction. The first portion 122e1 is connected to the second bottom surface portion 122t at the bottom surface 100b. The second portion 122e2 is connected to the first through-wiring 13 inside the blank 10.

[0158] ​Specifically, the first width W21 is smaller than the second width W22, and the second width W22 is larger than the third width W23. In other words, the first width W21, the second width W22, and the third width W23 vary in size along the Z direction. For example, the first width W21 is 0.12 mm, the second width W22 is 0.132 mm, and the third width W23 is 0.05 mm. Furthermore, the size of the second bottom portion 122t in the Y direction is larger than the first width W21. In this case, the size relationship in the Y direction varies alternately between the second bottom portion 122t, the first portion 122e1, the second portion 122e2, and the third portion 122e3 along the Z direction.

[0159] like Figure 4B As shown, the second end surface portion 122e of the second external electrode 122 does not overlap with the axis AX of the coil 110. This configuration can reduce the obstruction of the second end surface portion 122e to the magnetic flux of the coil 110 and improve the efficiency of obtaining inductance.

[0160] Preferably, the second end surface portion 122e does not overlap with the inner diameter portion of the coil 110 when viewed from the axis AX of the coil 110. This configuration further reduces the obstruction of the second end surface portion 122e to the magnetic flux of the coil 110 and further improves the efficiency of obtaining inductance.

[0161] like Figure 4B As shown, the size of the second end surface portion 122e of the second external electrode 122 in the Z direction is at least half the size of the green body 10 in the Z direction, and more preferably at least two-thirds the size of the green body 10 in the Z direction. This structure can improve the mounting strength of the second external electrode 122 due to the solder fillet.

[0162] Preferably, at least a portion of the second end surface portion 122e of the second external electrode 122 protrudes from the second end surface 100e2. This configuration improves the mountability of the second external electrode 122. Furthermore, electrical characteristics can be easily obtained during characteristic selection in a subsequent process.

[0163] like Figure 3 As shown, it is preferable that the area of ​​the portion of the first external electrode 121 exposed from the outer surface 100 of the body 10 when viewed from the first end surface 100e1 side in the X direction ( Figure 3 The area of ​​the region indicated by the solid oblique line) and the area of ​​the portion of the second external electrode 122 exposed from the outer surface 100 of the body 10 ( Figure 3 With this configuration, the amount of solder used to mount the inductor component 1 can be made equal in the first external electrode 121 and the second external electrode 122, thereby further stabilizing the posture of the inductor component.

[0164] Preferably, the first external electrode 121 and the second external electrode 122 do not overlap the coil 110 when viewed from the Z direction. If described concretely, refer to Figure 2 In the first external electrode 121, by extending the second portion 121e2 of the first end face portion 121e in the X direction and connecting with the second through-wiring 14 at a position not overlapping the first bottom face portion 121t, the first external electrode 121 can not overlap the coil 110. The same is true for the second external electrode 122. According to the above structure, the parasitic capacitance between the coil 110 and the first external electrode 121 and the second external electrode 122 can be reduced.

[0165] Figure 5 is a schematic view showing a modification example of the first external electrode 121A viewed from the first end face 100e1 side. As Figure 5 indicated, the three regions of the first end face portion 121e of the first external electrode 121A each have a side edge on both end sides in the Y direction. The inclination angle of the side edge when viewed from the X direction with respect to the Z direction is different in all regions.

[0166] If described concretely, when viewed from the first end face 100e1 side in the X direction, the both ends of the first portion 121e1 have a first side edge b1, the both ends of the second portion 121e2 have a second side edge b2, and the both ends of the third portion 121e3 have a third side edge b3. The inclination angle of the first side edge b1 with respect to the Z direction, the inclination angle of the second side edge b2 with respect to the Z direction, and the inclination angle of the third side edge b3 with respect to the Z direction are different from each other when viewed from the X direction. The inclination angle of the first side edge b1, the inclination angle of the second side edge b2, and the inclination angle of the third side edge b3 increase in order. The shape of the third side edge b3 of the both ends is a shape in which the center in the Z direction is contracted.

[0167] According to the above structure, by taking into account the processing deviation when laminating each region (the first portion 121e1 to the third portion 121e3) is formed, the positional deviation between each region can be prevented, and the electrical connection between each region can be ensured. Further, the same structure and the same effect can be applied to the second external electrode as well.

[0168] (Positions of centers of areas of the first external electrode 121 and the second external electrode 122)

[0169] As Figure 4A indicated, the method of finding the position of the center of the area of the first external electrode 121 when viewed from the first end face 100e1 side in the X direction is described.

[0170] The center of gravity of the area of ​​the first external electrode 121 refers to the center of the area distribution of the first external electrode 121 in the Y direction of the body 10 when viewed from the first end surface 100e1 side in the X direction of the body 10.

[0171] Specifically, when viewed from the first end surface 100e1 side in the X direction, the first external electrode 121 is composed of four figures, in other words, a first bottom surface portion 121t, a first portion 121e1 of the first end surface portion 121e, a second portion 121e2 of the first end surface portion 121e, and a third portion 121e3 of the first end surface portion 121e.

[0172] Moreover, if the area of ​​the first bottom surface portion 121t is set to St, the position of the center of gravity of the first bottom surface portion 121t in the Y direction is set to Xt, and the area of ​​the first portion 121e1 is set to Se1, the position of the center of gravity of the first portion 121e1 in the Y direction is set to Xe1, and the area of ​​the second portion 121e2 is set to Se2, the position of the center of gravity of the second portion 121e2 in the Y direction is set to Xe2, and the area of ​​the third portion 121e3 is set to Se3, and the position of the center of gravity of the third portion 121e3 in the Y direction is set to Xe3, then the center of gravity position X of the area of ​​the first external electrode 121 is calculated as X=(St×Xt+Se1×Xe1+Se2×Xe2+Se3×Xe3) / (St+Se1+Se2+Se3).

[0173] The center of gravity of the area of ​​the second external electrode 122 is also obtained in the same manner as that of the first external electrode 121 , and thus description thereof is omitted.

[0174] like Figure 3 As shown, when viewed from the first end surface 100e1 side in the X direction, the center of gravity of the area of ​​the first external electrode 121 and the center of gravity of the area of ​​the second external electrode 122, which are determined as described above, are located on opposite sides of the center M. In other words, the center of gravity of the area of ​​the first external electrode 121 is located on the second side surface 100s2 side relative to the center M, and the center of gravity of the area of ​​the second external electrode 122 is located on the first side surface 100s1 side relative to the center M.

[0175] (Method of Manufacturing Inductor Component 1)

[0176] Next, use Figure 6A through Figure 6H A method for manufacturing the inductor component 1 will be described. Figure 6A through Figure 6H corresponds to Figure 2 A-A section diagram of .

[0177] like Figure 6AAs shown, a glass substrate 1021 that is to become the substrate 21 is prepared. The glass substrate 1021 is a single-layer glass plate. A plurality of through holes V are provided at prescribed positions of the glass substrate 1021. At this time, the glass substrate 1021 can also be opened by laser processing, or opened by dry or wet etching processing or mechanical processing such as drilling.

[0178] As shown, a seed layer (not shown) is provided over the entire surface of the glass substrate 1021, and a layer of copper is formed on the seed layer by electrolytic plating. The seed layer and the layer of copper on the top surface and the bottom surface of the glass substrate 1021 are then removed by wet etching or dry etching. As a result, a through conductor layer 1014 that is to become the second through wiring 14 is formed in the through holes V of the glass substrate 1021. In addition, a third base layer 1121e3 that is to become the base of the third portion 121e3 of the first end surface portion 121e is formed. At this time, although not shown, a through conductor layer that is to become the first through wiring 13 is similarly formed in the through holes V, and a second base layer that is to become the base of the third portion 122e3 of the second end surface portion 122e is formed. Figure 6B As shown, a seed layer (not shown) is provided over the entire surface of the glass substrate 1021, and a layer of copper is formed on the seed layer by electrolytic plating. The seed layer and the layer of copper on the top surface and the bottom surface of the glass substrate 1021 are then removed by wet etching or dry etching. As a result, a through conductor layer 1014 that is to become the second through wiring 14 is formed in the through holes V of the glass substrate 1021. In addition, a third base layer 1121e3 that is to become the base of the third portion 121e3 of the first end surface portion 121e is formed. At this time, although not shown, a through conductor layer that is to become the first through wiring 13 is similarly formed in the through holes V, and a second base layer that is to become the base of the third portion 122e3 of the second end surface portion 122e is formed.

[0179] Figure 6C As shown, a seed layer (not shown) is provided over the entire surface of the glass substrate 1021, and a layer of copper is formed on the seed layer by electrolytic plating. The seed layer and the layer of copper on the top surface and the bottom surface of the glass substrate 1021 are then removed by wet etching or dry etching. As a result, a through conductor layer 1014 that is to become the second through wiring 14 is formed in the through holes V of the glass substrate 1021. In addition, a third base layer 1121e3 that is to become the base of the third portion 121e3 of the first end surface portion 121e is formed. At this time, although not shown, a through conductor layer that is to become the first through wiring 13 is similarly formed in the through holes V, and a second base layer that is to become the base of the third portion 122e3 of the second end surface portion 122e is formed.

[0180] In addition, in the case where the copper layer is not removed, the bottom surface conductor layer 1011b and the top surface conductor layer 1011t can also be formed. In this case, the shape of the upper surface of the bottom surface conductor layer 1011b and the top surface conductor layer 1011t corresponding to the through holes V becomes a concave shape. Figure 6B As shown, an insulating resin layer 1022 that is to become the insulating layer 22 is applied and cured so as to cover the conductor layers on the top surface and the bottom surface of the glass substrate 1021. As shown, a hole 1022a is provided in the second base layer 1121e2 of the insulating resin layer 1022 on the bottom surface side using laser processing.

[0181] Figure 6D As shown, an insulating resin layer 1022 that is to become the insulating layer 22 is applied and cured so as to cover the conductor layers on the top surface and the bottom surface of the glass substrate 1021. As shown, a hole 1022a is provided in the second base layer 1121e2 of the insulating resin layer 1022 on the bottom surface side using laser processing. Figure 6E As shown, an insulating resin layer 1022 that is to become the insulating layer 22 is applied and cured so as to cover the conductor layers on the top surface and the bottom surface of the glass substrate 1021. As shown, a hole 1022a is provided in the second base layer 1121e2 of the insulating resin layer 1022 on the bottom surface side using laser processing.

[0182] Figure 6F ​​​As shown, a seed layer not shown is provided on the insulating resin layer 1022 on the bottom surface side, and a photoresist that is patterned is formed on the seed layer. Next, a layer of copper is formed on the seed layer in the opening portion of the photoresist by electrolytic plating. Thereafter, the photoresist and the seed layer are removed by wet etching or dry etching. Thus, the first bottom surface base layer 1121t that is the base of the first bottom surface portion 121t and is patterned into an arbitrary shape, and the second bottom surface base layer 1122t that is the base of the second bottom surface portion 122t are formed. In addition, the first base layer 1121e1 that is the base of the first portion 121e1 of the first end surface portion 121e is formed in the hole 1022a. At this time, although not shown, the first base layer that is the base of the first portion 122e1 of the second end surface portion 122e is formed in the hole of the insulating resin layer 1022 on the bottom surface side.

[0183] As shown, the wafer is singulated at the dicing line C, and as shown, a plating layer 1121, 1122 is formed by barrel plating to cover each base layer. In other words, the first external electrode 121 is formed by covering the first bottom surface base layer 1121t, the first base layer 1121e1, the second base layer 1121e2, and the third base layer 1121e3 with the plating layer 1121. In addition, the second external electrode 122 is formed by covering the second bottom surface base layer 1122t and the first base layer, the second base layer, and the third base layer connected to the second bottom surface base layer 1122t with the plating layer 1122. Thus, the inductor component 1 is manufactured. Figure 6G Figure 6H As shown, the wafer is singulated at the dicing line C, and as shown, a plating layer 1121, 1122 is formed by barrel plating to cover each base layer. In other words, the first external electrode 121 is formed by covering the first bottom surface base layer 1121t, the first base layer 1121e1, the second base layer 1121e2, and the third base layer 1121e3 with the plating layer 1121. In addition, the second external electrode 122 is formed by covering the second bottom surface base layer 1122t and the first base layer, the second base layer, and the third base layer connected to the second bottom surface base layer 1122t with the plating layer 1122. Thus, the inductor component 1 is manufactured.

[0184] The plating layer 1121, 1122 contains, for example, two layers of Ni / Sn. In addition, the plating layer 1121, 1122 can also contain, for example, multiple layers of Cu / Ni / Au, Cu / Ni / Pd / Au, and the like. In addition, as the external electrode, the plating layer can not be provided and only the base layer can be provided, as long as the most suitable material is selected from rust prevention, solder wettability, resistance to electromigration, and the like.

[0185] In addition, in the manufacturing method described above, a glass substrate is used as the blank, but a sintered material can also be used as the blank. In this case, the inductor wiring of one turn or less is formed by printing with a conductive paste. Here, as the conductive paste, a material with good electrical conductivity such as Ag, Cu, and the like is selected.

[0186] In addition, the copper layer is removed by wet etching or dry etching, but CMP processing, mechanical processing can also be used when removing the copper layer. In addition, when the through conductor layer that becomes the through wiring is formed in the via V, all of it is formed by plating, but it is also possible to fill the gap portion with a conductive resin after partially plating.

[0187] ​Next, an insulating paste such as glass, ferrite, or the like is printed, and this process is repeated. By forming the above insulating paste in the opening portion of the connecting portion opening of the inductor wiring, and filling the opening portion with a conductive paste, the connecting portion of the inductor wiring between layers can be electrically connected.

[0188] After that, when heat treatment is performed at a high temperature and the insulating paste is sintered, singulation is performed, external terminals are formed, and an inductor component is manufactured. If the insulating paste uses a material such as glass, which has high insulation, an inductor component with a high Q can be obtained at a high frequency. If the insulating paste uses ferrite, an inductor component with a high inductance can be obtained.

[0189] 3. Modification

[0190] (First Modification)

[0191] Figure 7A is a schematic end surface view of the first modification of the inductor component, as viewed from the first end surface 100el side. Figure 7B is a schematic end surface view of the first modification of the inductor component, as viewed from the second end surface 100e2 side. Figure 7C is a schematic end surface view of the first modification of the inductor component, as viewed from the first end surface 100el side.

[0192] As shown in Figure 7A , in the inductor component 1B of the first modification, the first external electrode 121B has a first bottom surface portion 121t and a first end surface portion 121e. The first bottom surface portion 121t is the same structure as the first bottom surface portion 121t shown in Figure 4A . The first end surface portion 121e is different from the first end surface portion 121e shown in Figure 4A , and has one region with a constant size in the Z direction Y direction when viewed from the first end surface 100el side. In other words, the first end surface portion 121e is composed of one rectangle when viewed from the first end surface 100el side.

[0193] As shown in Figure 7B , in the inductor component 1B of the first modification, the second external electrode 122B has a second bottom surface portion 122t and a second end surface portion 122e. The second bottom surface portion 122t is the same structure as the second bottom surface portion 122t shown in Figure 4B . The second end surface portion 122e is different from the second end surface portion 122e shown in Figure 4B , and has one region with a constant size in the Z direction Y direction when viewed from the second end surface 100e2 side. In other words, the second end surface portion 122e is composed of one rectangle when viewed from the second end surface 100e2 side.

[0194] AsFigure 7C As shown in FIG. 17, in the inductor component 1B of the first modification example, the first end surface portion 121e of the first external electrode 121B and the second end surface portion 122e of the second external electrode 122B do not overlap each other when viewed from the first end surface 100el side in the X direction. On the other hand, the first bottom surface portion 121t of the first external electrode 121B and the second bottom surface portion 122t of the second external electrode 122B overlap each other entirely when viewed from the first end surface 100el side in the X direction. In Figure 7C In FIG. 17, for convenience, the exposed portion of the first external electrode 121B is indicated by a solid oblique line, and the exposed portion of the second external electrode 122B is indicated by a broken oblique line.

[0195] According to the above structure, since the first end surface portion 121e and the second end surface portion 122e do not overlap each other when viewed from the first end surface 100el side in the X direction, the first external electrode 121 and the second external electrode 122 can be further reduced, and the parasitic capacitance between the coil 110 and the first external electrode 121 and the second external electrode 122 can be further reduced. In addition, at least one of the first external electrode 121 and the second external electrode 122 can not be formed, in which case the first end surface portion 121e and the second end surface portion 122e also do not overlap each other.

[0196] (Second Modification Example)

[0197] Figure 8A FIG. 18 is a schematic end surface view indicating a second modification example of an inductor component, as viewed from a first end surface 100el side. Figure 8B FIG. 19 is a schematic end surface view indicating the second modification example of the inductor component, as viewed from a second end surface 100e2 side.

[0198] As shown in FIG. 18, in the inductor component 1C of the second modification example, the point at which the dummy terminals 131, 132 are provided is different from that of the inductor component 1B of the first modification example. The dummy terminals 131, 132 are provided to the blank 10 and are not electrically connected to the coil 110. According to the above structure, a solder fillet can be formed at the dummy terminals 131, 132, and the mounting strength of the inductor component 1C can be further improved. Figure 8A Figure 8B As shown in FIG. 18, in the inductor component 1C of the second modification example, the point at which the dummy terminals 131, 132 are provided is different from that of the inductor component 1B of the first modification example. The dummy terminals 131, 132 are provided to the blank 10 and are not electrically connected to the coil 110. According to the above structure, a solder fillet can be formed at the dummy terminals 131, 132, and the mounting strength of the inductor component 1C can be further improved.

[0199] If described specifically, as shown in FIG. 18, the first dummy terminal 131 is provided to the first end surface 100el of the blank 10. The first dummy terminal 131 is the same shape as the first end surface portion 121e and is arranged in parallel to the first end surface portion 121e. The first dummy terminal 131 is not connected to the first external electrode 121B, and the first external electrode 121B does not include the first dummy terminal 131. Figure 8A ​​

[0200] As Figure 8B illustrated, the second dummy terminal 132 is provided to the second end surface 100e2 of the blank 10. The second dummy terminal 132 is the same shape as the second end surface portion 122e, and is arranged in parallel with the second end surface portion 122e. The second dummy terminal 132 is not connected to the second external electrode 122B, and the second external electrode 122B does not include the second dummy terminal 132.

[0201] (Third Modification)

[0202] Figure 9A is a schematic end surface view of the third modification of the inductor component, as viewed from the first end surface 100el side. Figure 9B is a schematic end surface view of the third modification of the inductor component, as viewed from the second end surface 100e2 side. Figure 9C is a schematic end surface view of the third modification of the inductor component, as viewed from the first end surface 100el side.

[0203] As Figure 9A and Figure 9B illustrated, in the inductor component 1D of the third modification, the external electrodes 121D, 122D have a point different from the first modification of the inductor component IB, in that an additional portion 121f, 122f is provided.

[0204] If described specifically, as Figure 9A illustrated, the first external electrode 121D has a first bottom surface portion 121t, a first end surface portion 121e, and a first additional portion 121f. The first bottom surface portion 121t and the first end surface portion 121e are the same structure as the first bottom surface portion 121t and the first end surface portion 121e illustrated in Figure 7A . The first additional portion 121f is provided to the first end surface 100el of the blank 10. The first additional portion 121f is a shape that is reduced from the first end surface portion 121e, and is arranged in parallel with the first end surface portion 121e. The first additional portion 121f is connected to the first bottom surface portion 121t.

[0205] As Figure 9B illustrated, the second external electrode 122D has a second bottom surface portion 122t, a second end surface portion 122e, and a second additional portion 122f. The second bottom surface portion 122t and the second end surface portion 122e are the same structure as the second bottom surface portion 122t and the second end surface portion 122e illustrated in Figure 7B . The second additional portion 122f is provided to the second end surface 100e2 of the blank 10. The second additional portion 122f is a shape that is reduced from the second end surface portion 122e, and is arranged in parallel with the second end surface portion 122e. The second additional portion 122f is connected to the second bottom surface portion 122t.

[0206] As Figure 9C shown in FIG. 15, in the inductor component 1D of the third modification example, when viewed from the first end surface 100el side in the X direction, a part of the first end surface portion 121e of the first external electrode 121D overlaps all of the second additional portion 122f of the second external electrode 122D, and a part of the second end surface portion 122e of the second external electrode 122D overlaps all of the first additional portion 121f of the first external electrode 121D. On the other hand, when viewed from the first end surface 100el side in the X direction, the first bottom surface portion 121t of the first external electrode 121D and the second bottom surface portion 122t of the second external electrode 122D overlap each other entirely. Figure 9C In FIG. 15, for convenience, the exposed portion of the first external electrode 121D is indicated by a solid oblique line, and the exposed portion of the second external electrode 122D is indicated by a broken oblique line.

[0207] In the case of this modification example, when viewed from the first end surface 100el side in the X direction of the green compact 10, the center of gravity position of the area of the first external electrode 121D and the center of gravity position of the area of the second external electrode 122D are located on opposite sides with respect to the center M of the Y direction of the green compact 10. The center of gravity positions of the areas of the first external electrode 121D and the second external electrode 122D are found by the above-described calculation method of the "center of gravity position of the area of the external electrode".

[0208] If described specifically, when viewed from the first end surface 100el side in the X direction, the first external electrode 121D is composed of three figures, in other words, the first bottom surface portion 121t, the first end surface portion 121e, and the first additional portion 121f.

[0209] Further, if the area of the first bottom surface portion 121t is set as St, the position of the center of gravity of the first bottom surface portion 121t in the Y direction is set as Xt, in addition, the area of the first end surface portion 121e is set as Se, the position of the center of gravity of the first end surface portion 121e in the Y direction is set as Xe, in addition, the area of the first additional portion 121f is set as Sf, and the position of the center of gravity of the first additional portion 121f in the Y direction is set as Xf, the center of gravity position X of the area of the first external electrode 121D is found as X = (St X X + Se X Xe + Sf X Xf) / (St + Se + Sf).

[0210] Further, the center of gravity position of the area of the second external electrode 122D is also found in the same manner as the first external electrode 121D, and the description thereof is omitted.

[0211] As Figure 9CAs shown, when viewed from the first end surface 100e1 side in the X direction, the center of gravity of the area of ​​the first external electrode 121D and the center of gravity of the area of ​​the second external electrode 122D determined as described above are located on opposite sides relative to the center M. In other words, the center of gravity of the area of ​​the first external electrode 121D is located on the second side surface 100s2 side relative to the center M, and the center of gravity of the area of ​​the second external electrode 122D is located on the first side surface 100s1 side relative to the center M.

[0212] Furthermore, the number of first additional parts 121f and second additional parts 122f may be increased or decreased, or the number of first additional parts 121f and second additional parts 122f may be different. For example, one first additional part 121f and two second additional parts 122f may be provided, or no first additional part 121f may be provided and one second additional part 122f may be provided.

[0213] <Second embodiment>

[0214] Figure 10 This is a schematic end view of a second embodiment of an inductor component, viewed from the first end face 100e1. The second embodiment differs from the first embodiment in the structure of the external electrodes. This difference is described below. Other structures identical to those of the first embodiment are denoted by the same reference numerals as in the first embodiment, and their descriptions are omitted.

[0215] like Figure 10 As shown, in the inductor component 1E of the second embodiment, the first external electrode 121E and the second external electrode 122E are provided only on the bottom surface 100b. This further reduces the size of the first external electrode 121E and the second external electrode 122E, and further reduces the parasitic capacitance between the coil 110 and the first external electrode 121E and the second external electrode 122E.

[0216] Furthermore, at least a portion of the first external electrode 121E and at least a portion of the second external electrode 122E protrude from the bottom surface 100b toward the outside of the base body 10. This improves the mounting performance of the first external electrode 121E and the second external electrode 122E. Furthermore, electrical characteristics can be easily determined during subsequent characterization steps.

[0217] Specifically, the first external electrode 121E does not include the first end surface portion 121e of the first embodiment, but instead includes a first bottom surface portion 121t provided on the bottom surface 100b. The first bottom surface portion 121t is disposed on the bottom surface 100b so as to protrude from the bottom surface 100b. The first bottom surface portion 121t is located on the second side surface 100s2 side, closer to the first end surface 100e1.

[0218] Similarly, the second external electrode 122E does not have the second end surface portion 122e of the first embodiment, but has a second bottom surface portion 122t provided to the bottom surface 100b. The second bottom surface portion 122t is arranged on the bottom surface 100b so as to protrude from the bottom surface 100b. The second bottom surface portion 122t is located on the first side surface 100s1 side on the second end surface 100e2 side.

[0219] From the first end surface 100el side, the first external electrode 121E and the second external electrode 122E do not overlap each other, but a portion of the first external electrode 121E and a portion of the second external electrode 122E can also overlap each other from the first end surface 100el side.

[0220] Furthermore, the present disclosure is not limited to the above-described embodiments, and design changes can be made within the scope of the gist of the present disclosure. For example, the respective features of the first embodiment and the second embodiment can be combined separately.

Claims

1. An inductor component comprising: A blank having a length, a width, and a height; a coil, disposed on the blank and wound along the axis; and The first external electrode and the second external electrode are provided on the above-mentioned body and are electrically connected to the above-mentioned coil. The blank has a first end face and a second end face at both ends in the length direction, a first side face and a second side face at both ends in the width direction, and a bottom face and a top face at both ends in the height direction, wherein: The length direction is the direction along the length of the blank, the width direction is the direction along the width of the blank, and the height direction is the direction along the height of the blank. The first external electrode is provided on a first end surface side relative to the center of the longitudinal direction of the green body so as to be exposed from the outer surface of the green body, and the first end surface side is a side of the first end surface of the green body. The second external electrode is provided on the second end face side relative to the center in the longitudinal direction of the green body so as to be exposed from the outer surface of the green body, and the second end face side is a side of the second end face of the green body. When viewed from the first end surface side in the longitudinal direction, at least a portion of the portion of the first external electrode exposed from the outer surface of the green body and at least a portion of the portion of the second external electrode exposed from the outer surface of the green body do not overlap with each other. When viewed from the first end surface side in the longitudinal direction, the center of gravity of the area of ​​the portion of the first external electrode exposed from the outer surface of the green body and the center of gravity of the area of ​​the portion of the second external electrode exposed from the outer surface of the green body are located on opposite sides relative to the center of the green body in the width direction. The green body includes a substrate and an insulating layer, wherein the substrate has a bottom surface and a top surface located at both ends in the height direction, and the insulating layer covers each of the bottom surface and the top surface of the substrate. The coil includes a bottom surface wiring, a top surface wiring, and a pair of through-wirings, wherein the bottom surface wiring is arranged above the bottom surface of the substrate and is covered by the insulating layer, the top surface wiring is arranged above the top surface of the substrate and is covered by the insulating layer, the pair of through-wirings extends over the bottom surface and the top surface, penetrates the substrate, and is arranged on opposite sides relative to the axis, the bottom surface wiring, the first through-wiring of the pair of through-wirings, the top surface wiring, and the second through-wiring of the pair of through-wirings are sequentially connected to constitute at least a portion of the coil wound along the direction of the axis. The first external electrode is an L-shaped electrode provided continuously on the first end surface and the bottom surface. When viewed from the first end surface side in the longitudinal direction, a first end surface portion of the first external electrode provided on the first end surface is located on the same side as the through wiring connected to the first external electrode relative to the center of the body in the width direction.

2. An inductor component comprising: A blank having a length, a width, and a height; a coil, disposed on the blank and wound along the axis; and The first external electrode and the second external electrode are provided on the above-mentioned body and are electrically connected to the above-mentioned coil. The blank has a first end face and a second end face at both ends in the length direction, a first side face and a second side face at both ends in the width direction, and a bottom face and a top face at both ends in the height direction, wherein: The length direction is the direction along the length of the blank, the width direction is the direction along the width of the blank, and the height direction is the direction along the height of the blank. The first external electrode is provided on a first end surface side relative to the center of the longitudinal direction of the green body so as to be exposed from the outer surface of the green body, and the first end surface side is a side of the first end surface of the green body. The second external electrode is provided on the second end face side relative to the center in the longitudinal direction of the green body so as to be exposed from the outer surface of the green body, and the second end face side is a side of the second end face of the green body. When viewed from the first end surface side in the longitudinal direction, at least a portion of the portion of the first external electrode exposed from the outer surface of the green body and at least a portion of the portion of the second external electrode exposed from the outer surface of the green body do not overlap with each other. When viewed from the first end surface side in the longitudinal direction, the center of gravity of the area of ​​the portion of the first external electrode exposed from the outer surface of the green body and the center of gravity of the area of ​​the portion of the second external electrode exposed from the outer surface of the green body are located on opposite sides relative to the center of the green body in the width direction. The first external electrode is continuously provided on the first end surface and the bottom surface, When viewed from the first end surface side in the longitudinal direction, the first end surface portion of the first external electrode provided on the first end surface has three or more regions having different sizes in the width direction along the height direction. The three or more regions of the first end surface portion each have side edges located at both ends in the width direction, and an inclination angle of the side edges with respect to the height direction when viewed from the longitudinal direction is different in all the regions.

3. The inductor component according to claim 2, wherein The green body includes a substrate and an insulating layer, wherein the substrate has a bottom surface and a top surface located at both ends in the height direction, and the insulating layer covers each of the bottom surface and the top surface of the substrate. The coil has a bottom surface wiring, a top surface wiring and a pair of through-wirings, wherein the bottom surface wiring is arranged above the bottom surface of the substrate and is covered by the insulating layer, the top surface wiring is arranged above the top surface of the substrate and is covered by the insulating layer, the pair of through-wirings extends through the bottom surface and the top surface, penetrates the substrate, and is arranged on opposite sides relative to the axis, the bottom surface wiring, the first through-wiring of the pair of through-wirings, the top surface wiring and the second through-wiring of the pair of through-wirings are connected in sequence to constitute at least a part of the coil wound along the direction of the axis.

4. The inductor component according to any one of claims 1 to 3, wherein The second external electrode is continuously provided on the second end surface and the bottom surface.

5. The inductor component according to any one of claims 1 to 3, wherein When viewed from the first end surface side in the longitudinal direction, a first end surface portion of the first external electrode provided at the first end surface and a second end surface portion of the second external electrode provided at the second end surface do not overlap with each other. The inductor component according to claim 2 , wherein: Regarding the sizes of the three or more regions of the first end surface portion in the width direction, the size relationship therebetween changes alternately along the height direction.

7. The inductor component according to any one of claims 1 to 3, wherein A first end surface portion of the first external electrode provided on the first end surface and a second end surface portion of the second external electrode provided on the second end surface do not overlap with the axis of the coil.

8. The inductor component according to claim 7, wherein The first end surface portion and the second end surface portion do not overlap with an inner diameter portion of the coil when viewed in the direction of the axis of the coil.

9. The inductor component according to any one of claims 1 to 3, wherein The height direction size of the first end surface portion of the first external electrode provided on the first end surface and the height direction size of the second end surface portion of the second external electrode provided on the second end surface are more than half of the height direction size of the blank.

10. The inductor component according to any one of claims 1 to 3, wherein At least a portion of a first end surface portion of the first external electrode provided on the first end surface protrudes from the first end surface.

11. The inductor component according to any one of claims 1 to 3, wherein The above-mentioned blank comprises a single glass sheet.

12. The inductor component according to any one of claims 1 to 3, wherein A portion of the outer surface of the blank is made of a material different from that of the other outer surfaces.

13. The inductor component according to any one of claims 1 to 3, wherein The volume of the above inductor component is 0.08mm 3 Below, and the size of the long side of the inductor component is 0.65 mm or less.

14. The inductor component according to any one of claims 1 to 3, wherein The first external electrode and the second external electrode do not overlap with the coil when viewed from the height direction.

15. The inductor component according to any one of claims 1 to 3, wherein When viewed from the first end surface in the longitudinal direction, an area of ​​a portion of the first external electrode exposed from the outer surface of the base body is equal to an area of ​​a portion of the second external electrode exposed from the outer surface of the base body.

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