Patent Publication Number: US-2023140067-A1

Title: Inductor component and mounting component

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims benefit of priority to Japanese Patent Application No. 2021-180474, filed Nov. 4, 2021, the entire content of which is incorporated herein by reference. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an inductor component and a mounting component. 
     Background Art 
     There has been an inductor component described in Japanese Unexamined Patent Application Publication No. 2014-13815. The inductor component includes a substrate, spiral conductors provided on both surfaces of the substrate, respectively, a magnetic layer covering the spiral conductor, an outer electrode provided on a surface of the magnetic layer, an extended conductor connected to an outer peripheral end of the spiral conductor, and a connection conductor connecting the extended conductor and the outer electrode. The spiral conductor and the extended conductor constitute a coil. The extended conductor is disposed outside in a radial direction of the spiral conductor, and extends along a side of the substrate. 
     SUMMARY 
     Incidentally, in the above-described existing inductor component, when a DC superposition allowable current is increased in order to cause a large current to flow, the number of turns of the spiral conductor is made to be equal to or less than  1  in order to suppress magnetic saturation. It has been found that there are the following problems when actually trying to manufacture such an inductor component. 
     Since both ends of the spiral conductor come close to each other, the two extended conductors respectively connected to both the ends of the spiral conductor also come close to each other, and there is a possibility that the two extended conductors having a greatest potential difference in the coil will be short-circuited. In addition, since the two extended conductors are disposed outside in the radial direction of the spiral conductor, there is a possibility that the inductor component will become large. 
     Accordingly, the present disclosure provides an inductor component and a mounting component capable of reducing a possibility of a short circuit of a coil and of reducing the size of the inductor component. 
     An inductor component as an aspect of the present disclosure includes an element body having a main surface, a coil disposed in the element body, and extending along the main surface, and a first vertical wiring and a second vertical wiring provided in the element body such that respective end surfaces thereof are exposed from the main surface of the element body, and connected to respective ends of the coil. The coil has a coil wiring portion having a first end portion and a second end portion, and extending along a circumferential direction, with the number of turns equal to or less than 1, a first pad portion that is a portion to which the first vertical wiring is connected and that is connected to the first end portion, and a second pad portion that is a portion to which the second vertical wiring is connected and that is connected to the second end portion. At least a part of the first pad portion extends in a direction that intersects a direction in which the first end portion and the second end portion are connected and that is a direction in which an inner peripheral surface of the coil wiring portion is approached when viewed from a direction orthogonal to the main surface. At least a part of the second pad portion extends in the direction that intersects the direction in which the first end portion and the second end portion are connected and that is the direction in which the inner peripheral surface of the coil wiring portion is approached when viewed from the direction orthogonal to the main surface. 
     Here, the fact that the number of turns of the coil wiring portion is less than 1 refers to a state in which the coil wiring portion does not have parts that are adjacent to each other in a radial direction of the coil and run side by side in a winding direction (that is, parts that are adjacent and overlap in the radial direction) when viewed from the direction orthogonal to the main surface. A fact that the number of turns of the coil wiring portion is equal to or greater than 1 refers to a state in which the coil wiring portion has parts that are adjacent to each other in the radial direction of the coil and run side by side in the winding direction when viewed from the direction orthogonal to the main surface. That is, a fact that the number of turns of the coil wiring portion is equal to or less than 1 refers to a state in which the above-described parts running side by side are not present, or both end surfaces of the coil wiring portion are tangent to the same plane along the radial direction of the coil when viewed from an axial direction of the coil. 
     Further, a direction in which the first end portion and the second end portion are connected when viewed from the direction orthogonal to the main surface is a direction in which a center in a width direction of an end edge of the first end portion and a center in a width direction of an end edge of the second end portion are connected when viewed from the direction orthogonal to the main surface. 
     According to the above-described aspect, the first pad portion extends in the direction that intersects the direction in which the first end portion and the second end portion are connected and that is a direction in which the inner peripheral surface of the coil wiring portion is approached, and the second pad portion extends in the direction that intersects the direction in which the first end portion and the second end portion are connected and that is a direction in which the inner peripheral surface of the coil wiring portion is approached. According to this, it is possible to prevent the first pad portion and the second pad portion from approaching each other, and to reduce a possibility of a short circuit between the first pad portion and the second pad portion having a greatest potential difference in the coil. In addition, it is possible to prevent the first pad portion and the second pad portion from extending outward in the radial direction of the coil, to reduce the inductor component in size. 
     Preferably, in an embodiment of the inductor component, the element body includes a magnetic powder and a resin containing the magnetic powder. 
     According to the above-described embodiment, inductance can be increased. 
     Preferably, an embodiment of the inductor component further includes a first external terminal in contact with the main surface and the end surface of the first vertical wiring, and a second external terminal in contact with the main surface and the end surface of the second vertical wiring. 
     According to the above-described embodiment, since the first external terminal spreads across the main surface and the first vertical wiring, and the second external terminal spreads across the main surface and the second vertical wiring, sizes of the respective first and second external terminals can be controlled, and design of the first and second external terminals can be selected from a viewpoint of mounting properties and mechanical strength. 
     Preferably, in an embodiment of the inductor component, the element body includes a magnetic powder, and the first external terminal and the second external terminal are in contact with the magnetic powder. 
     According to the above-described embodiment, adhesion strength between each of the first external terminal and the second external terminal, and the element body is improved. 
     Preferably, an embodiment of the inductor component further includes a coating film provided on the main surface, and the coating film includes a black colorant. 
     According to the above-described embodiment, by providing the coating film on the main surface, when a plurality of the external terminals is provided on the main surface, insulation between the external terminals can be reliably ensured. In addition, since the coating film is black, it is possible to hide scratches on a surface of the element body, thereby improving a rate of good appearance. 
     Preferably, in an embodiment of the inductor component, when viewed from the direction orthogonal to the main surface, the first pad portion has a linear first plane that is a distal end surface in an extending direction of the first pad portion and that faces the inner peripheral surface of the coil wiring portion, and a shortest distance between the first plane and the inner peripheral surface of the coil wiring portion is not a minimum among distances between an outer surface of the first pad portion and the inner peripheral surface of the coil wiring portion. 
     Here, the distance between the outer surface of the first pad portion and the inner peripheral surface of the coil wiring portion refers to a shortest distance among distances between respective surfaces constituting the outer surface of the first pad portion and the inner peripheral surface of the coil wiring portion. 
     According to the above-described embodiment, it is possible to reduce a possibility of a short circuit between the first plane of the first pad portion and the inner peripheral surface of the coil wiring portion. 
     Preferably, in an embodiment of the inductor component, when viewed from the direction orthogonal to the main surface, the first pad portion has a linear first plane extending in the direction in which the first end portion and the second end portion are connected, and facing the inner peripheral surface of the coil wiring portion, and a linear second plane extending in a direction orthogonal to the direction in which the first end portion and the second end portion are connected, and facing the inner peripheral surface of the coil wiring portion. When a surface parallel to the first plane and tangent to a part, of the inner peripheral surface of the coil wiring portion, facing the first plane is defined as a first virtual surface, and a surface parallel to the second plane and tangent to a part, of the inner peripheral surface of the coil wiring portion, facing the second plane is defined as a second virtual surface, a first distance a between the second virtual surface and the second plane is less than a second distance b between the first virtual surface and the first plane. 
     According to the above-described embodiment, since the first distance a is less than the second distance b, it is possible to reduce a possibility of a short circuit between the first plane of the first pad portion and a part, of the inner peripheral surface of the coil wiring portion, facing the first plane. Even if a short circuit occurs between the second virtual surface and the second plane, a variation in a coil length is suppressed as compared to a case where a short circuit occurs between the first virtual surface and the first plane, and thus influence of a layer short can be suppressed. 
     Preferably, in an embodiment of the inductor component, when viewed from the direction orthogonal to the main surface, the first pad portion has a linear first plane extending in the direction in which the first end portion and the second end portion are connected, and facing the inner peripheral surface of the coil wiring portion, and a linear second plane extending in a direction orthogonal to the direction in which the first end portion and the second end portion are connected, and facing the inner peripheral surface of the coil wiring portion. When a surface parallel to the first plane and tangent to a part, of the inner peripheral surface of the coil wiring portion, facing the first plane is defined as a first virtual surface, and a surface parallel to the second plane and tangent to a part, of the inner peripheral surface of the coil wiring portion, facing the second plane is defined as a second virtual surface, a first distance a between the second virtual surface and the second plane is equal to or greater than a second distance b between the first virtual surface and the first plane. 
     According to the above-described embodiment, since the first distance a is equal to or greater than the second distance b, the first pad portion can be increased in the extending direction thereof. Thus, a size of the first pad portion can be increased, and connection reliability between the first pad portion and the first vertical wiring can be improved. 
     Preferably, in an embodiment of the inductor component, the element body includes a magnetic powder, and the first distance a between the second virtual surface and the second plane is equal to or greater than twice a particle size D50 of the magnetic powder. 
     According to the above-described embodiment, by increasing the distance between the second virtual surface and the second plane to be greater than the magnetic powder, it is possible to further reduce a possibility of a short circuit between the second virtual surface and the second plane. 
     Preferably, in an embodiment of the inductor component, when viewed from the direction orthogonal to the main surface, a shortest distance c between the first pad portion and the second pad portion is greater than the first distance a between the second virtual surface and the second plane. 
     According to the above-described embodiment, it is possible to further reduce a possibility of a short circuit between the first pad portion and the second pad portion that have a greatest potential difference in the coil. Even if a short circuit occurs between the second virtual surface and the second plane, a variation in the coil length is suppressed as compared to a case where a short circuit occurs between the first pad portion and the second pad portion, and thus influence of a layer short can be suppressed. 
     Preferably, in an embodiment of the inductor component, when viewed from the direction orthogonal to the main surface, a shortest distance c between the first pad portion and the second pad portion is equal to or less than the first distance a between the second virtual surface and the second plane. 
     According to the above-described embodiment, since the first pad portion and the second pad portion can be brought close to each other, a length of the coil wiring portion can be increased. Thus, the coil length can be increased, and the inductance can be increased. 
     Preferably, in an embodiment of the inductor component, the element body includes a magnetic powder, and the shortest distance c between the first pad portion and the second pad portion is equal to or greater than twice a particle size D50 of the magnetic powder. 
     According to the above-described embodiment, by increasing the distance between the first pad portion and the second pad portion to be greater than the magnetic powder, it is possible to further reduce a possibility of a short circuit between the first pad portion and the second pad portion. 
     Preferably, in an embodiment of the inductor component, the first pad portion has a first portion extending from the first end portion in the direction in which the first end portion and the second end portion are connected when viewed from the direction orthogonal to the main surface, and a second portion extending from a side of the first portion in the direction that intersects the direction in which the first end portion and the second end portion are connected and that is the direction in which the inner peripheral surface of the coil wiring portion is approached. The second pad portion has a first portion extending from the second end portion in the direction in which the first end portion and the second end portion are connected when viewed from the direction orthogonal to the main surface, and a second portion extending from a side of the first portion in the direction that intersects the direction in which the first end portion and the second end portion are connected and that is the direction in which the inner peripheral surface of the coil wiring portion is approached. 
     According to the above-described embodiment, an area of the first pad portion can be increased, and the connection reliability between the first pad portion and the first vertical wiring can be improved. An area of the second pad portion can be increased, and connection reliability between the second pad portion and the second vertical wiring can be improved. 
     Preferably, in an embodiment of the inductor component, when viewed from the direction orthogonal to the main surface, the first portion of the first pad portion does not protrude inward from the inner peripheral surface of the coil wiring portion. 
     According to the above-described embodiment, it is possible to increase a distance between the inner peripheral surface of the coil wiring portion and the first pad portion in the direction in which the first end portion and the second end portion are connected, and to reduce a possibility of a short circuit between the coil wiring portion and the first pad portion in the direction in which the first end portion and the second end portion are connected. 
     Preferably, in an embodiment of the inductor component, a thickness of the coil is less than a thickness of each of the first vertical wiring and the second vertical wiring. 
     According to the above-described embodiment, volume of the element body can be increased, and the inductance can be increased. 
     Preferably, an embodiment of the inductor component further includes a nonmagnetic insulating layer configured to cover at least a part of the coil. 
     According to the above-described embodiment, insulation properties of the coil can be improved. 
     Preferably, in an embodiment of the inductor component, the element body has a first magnetic layer and a second magnetic layer stacked in order in a first direction orthogonal to the main surface. The first vertical wiring and the second vertical wiring extend in the first direction from the respective ends of the coil. The first magnetic layer is present in a direction opposite to the first direction of the coil. The second magnetic layer is present in the first direction of the coil and in a direction orthogonal to the first direction, and the first vertical wiring and the second vertical wiring penetrate the second magnetic layer. A thickness of the first magnetic layer is greater than a thickness of the second magnetic layer. 
     According to the above-described embodiment, since there is a limit in a thickness related to a process such as a resist thickness for each of the first vertical wiring and the second vertical wiring, there is a limit in the thickness of the second magnetic layer. On the other hand, the inductance can be increased by increasing the thickness of the first magnetic layer. 
     Preferably, an embodiment of a mounting component includes a substrate, and the inductor component according to the embodiment disposed in the substrate. 
     According to the above-described embodiment, since the inductor component is built into the substrate, it is possible to increase a mounting area of a surface of the substrate. 
     According to the inductor component and the mounting component as an aspect of the present disclosure, it is possible to reduce a possibility of a short circuit of a coil, and to reduce the size of the inductor component. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a plan view illustrating a first embodiment of an inductor component; 
         FIG.  2    is a sectional view taken along a line A-A in  FIG.  1   ; 
         FIG.  3    is a plan view of the inductor component; 
         FIG.  4 A  is an explanatory view for explaining a method of manufacturing the inductor component; 
         FIG.  4 B  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 C  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 D  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 E  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 F  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 G  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 H  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 I  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 J  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 K  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 L  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  4 M  is an explanatory view for explaining the method of manufacturing the inductor component; 
         FIG.  5 A  is a plan view illustrating an inductor component of a first comparative example; 
         FIG.  5 B  is a plan view illustrating an inductor component of a second comparative example; 
         FIG.  5 C  is a plan view illustrating an inductor component of a first working example; 
         FIG.  5 D  is a plan view illustrating an inductor component of a second working example; 
         FIG.  6    is a graph showing a relationship between relative values of an L value and extension amounts of pad portions in the first comparative example, the second comparative example, the first working example, and the second working example; 
         FIG.  7    is a graph of an enlarged part of  FIG.  6   ; 
         FIG.  8    is a plan view illustrating a second embodiment of the inductor component; 
         FIG.  9    is a plan view illustrating a third embodiment of the inductor component; and 
         FIG.  10    is a sectional view illustrating an embodiment of a mounting component. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, an inductor component and a mounting component as an aspect of the present disclosure will be described in detail by using embodiments illustrated in the figures. Note that, some of the figures are schematic, and do not reflect actual dimensions and ratios in some cases. 
     First Embodiment 
     Configuration 
       FIG.  1    is a plan view illustrating a first embodiment of an inductor component.  FIG.  2    is a sectional view taken along the line A-A in  FIG.  1   . 
     An inductor component  1  is mounted, for example, in electronic devices such as personal computers, DVD players, digital cameras, TVs, mobile phones, and car electronics, and is, for example, a component having a rectangular parallelepiped shape as a whole. However, the shape of the inductor component  1  is not particularly limited, and may be a cylindrical shape, a polygonal columnar shape, a truncated cone shape, or a truncated polygonal cone shape. 
     As illustrated in  FIG.  1    and  FIG.  2   , the inductor component  1  includes an element body  10 , a coil  15  disposed in the element body  10 , a nonmagnetic insulating layer  60  covering at least a part of the coil  15 , a first columnar wiring  31  and a second columnar wiring  32  provided in the element body  10  with respective end surfaces exposed from a first main surface  10   a  of the element body  10  and connected to respective ends of the coil  15 , a first external terminal  41  exposed from the first main surface  10   a  of the element body  10  and connected to the first columnar wiring  31 , a second external terminal  42  exposed from the first main surface  10   a  of the element body  10  and connected to the second columnar wiring  32 , and a coating film  50  provided on each of the first main surface  10   a  and a second main surface  10   b  of the element body  10 . 
     In the figure, a thickness direction of the inductor component  1  is defined as a Z direction, a forward Z direction is referred to as an upper side, and a reverse Z direction is referred to as a lower side. In a plane orthogonal to the Z direction of the inductor component  1 , a length direction that is a longer direction of the inductor component  1  and is a direction in which the first external terminal  41  and the second external terminal  42  are arranged is defined as an X direction, and a width direction of the inductor component  1  that is a direction orthogonal to the length direction is defined as a Y direction. 
     The element body  10  has the first main surface  10   a  and the second main surface  10   b,  and a first side surface  10   c,  a second side surface  10   d,  a third side surface  10   e,  and a fourth side surface  10   f  that are located between the first main surface  10   a  and the second main surface  10   b  and that connect the first main surface  10   a  and the second main surface  10   b.    
     The first main surface  10   a  and the second main surface  10   b  are disposed on sides opposite to each other in the Z direction, respectively, the first main surface  10   a  is disposed in the forward Z direction, and the second main surface  10   b  is disposed in the reverse Z direction. The first side surface  10   c  and the second side surface  10   d  are disposed on sides opposite to each other in the X direction, respectively, the first side surface  10   c  is disposed in a reverse X direction, and the second side surface  10   d  is disposed in a forward X direction. The third side surface  10   e  and the fourth side surface  10   f  are disposed on sides opposite to each other in the Y direction, respectively, the third side surface  10   e  is disposed in a reverse Y direction, and the fourth side surface  10   f  is disposed in a forward Y direction. 
     The element body  10  has a first magnetic layer  11  and a second magnetic layer  12  stacked in order along the forward Z direction. The term “in order” merely indicates a positional relationship between the first magnetic layer  11  and the second magnetic layer  12 , and has no relation to an order of formation of the first magnetic layer  11  and the second magnetic layer  12 . The forward Z direction is an example of a “first direction orthogonal to a main surface” described in the claims. 
     Each of the first magnetic layer  11  and the second magnetic layer  12  includes a magnetic powder and a resin containing the magnetic powder. Inductance can be increased by the magnetic powder. The resin is, for example, epoxy-based, phenol-based, liquid crystal polymer-based, polyimide-based, or acrylic-based, or an organic insulating material made of a mixture thereof. The magnetic powder is, for example, a FeSi-based alloy such as FeSiCr, a FeCo-based alloy, a Fe-based alloy such as NiFe, or an amorphous alloy thereof. Accordingly, in comparison with a magnetic layer made of ferrite, since it is possible to improve DC superposition characteristics by the magnetic powder, and the magnetic powders are insulated from each other by the resin, a loss (iron loss) at a high frequency is reduced. Note that, the magnetic layer may be ferrite or a sintered body of magnetic powder, that contains no organic resin. 
     The coil  15  extends along the first main surface  10   a  between the first magnetic layer  11  and the second magnetic layer  12 . Specifically, the first magnetic layer  11  is present in the reverse Z direction of the coil  15 , and the second magnetic layer  12  is present in the forward Z direction of the coil  15  and in a direction orthogonal to the forward Z direction. 
     The coil  15  has a coil wiring portion  20 , a first pad portion  21 , and a second pad portion  22 . The coil wiring portion  20  has a first end portion  20   a  and a second end portion  20   b.  The first pad portion  21  is connected to the first end portion  20   a.  The second pad portion  22  is connected to the second end portion  20   b.    
     The coil wiring portion  20  extends along a circumferential direction with the number of turns equal to or less than 1. As described above, since the number of turns of the coil wiring portion  20  is equal to or less than 1, it is possible to suppress magnetic saturation, to increase a DC superposition allowable current, and to cause a large current to flow. The number of turns of the coil wiring portion  20  is preferably equal to or greater than 0.5. The coil wiring portion  20  is disposed so as to be symmetrical with respect to a center line in the X direction of the element body  10 . The first end portion  20   a  is disposed on a side of the first side surface  10   c  and a side of the third side surface  10   e  of the element body  10 , and the second end portion  20   b  is disposed on a side of the second side surface  10   d  and a side of the third side surface  10   e  of the element body  10 . In this embodiment, the coil wiring portion  20  is formed in a substantially C-shape. 
     The coil wiring portion  20  has the same width along an extending direction. The width is a dimension in a direction orthogonal to the extending direction. The first end portion  20   a  is a portion connected to the first pad portion  21 . The second end portion  20   b  is a portion connected to the second pad portion  22 . A line width of the coil wiring portion  20  is less than a line width of the first pad portion  21  and a line width of the second pad portion  22 . Note that, the line width of the first pad portion  21  and the line width of the second pad portion  22  may be the same as the line width of the coil wiring portion  20 . 
     The first pad portion  21  is a portion to which the first columnar wiring  31  is connected. The first pad portion  21  is a portion overlapping the first columnar wiring  31  when viewed from a direction orthogonal to the first main surface  10   a,  has a shape corresponding to an outer peripheral surface of the first columnar wiring  31 , and is slightly greater than the first columnar wiring  31 . The first pad portion  21  extends in a direction that intersects a direction L (hereinafter also referred to as a connection direction L) in which the first end portion  20   a  and the second end portion  20   b  are connected and that is a direction in which an inner peripheral surface  20   c  of the coil wiring portion  20  is approached when viewed from the direction orthogonal to the first main surface  10   a.  The connection direction L is a direction in which a center in a width direction of an end edge of the first end portion  20   a  and a center in a width direction of an end edge of the second end portion  20   b  are connected, when viewed from the direction orthogonal to the first main surface  10   a.  The end edge of the first end portion  20   a  and the end edge of the second end portion  20   b  are each indicated by a dotted line in  FIG.  1   . 
     In this embodiment, the first pad portion  21  extends in a direction orthogonal to the connection direction L. The connection direction L is parallel to the X direction, and the direction orthogonal to the connection direction L is parallel to the Y direction. That is, the first pad portion  21  is disposed on a side of the first side surface  10   c  of the element body  10 , and extends along the first side surface  10   c  of the element body  10 . The first pad portion  21  is formed in a linear shape when viewed from the direction orthogonal to the first main surface  10   a.  Note that, the first pad portion  21  may extend in a direction intersecting the connection direction L at an angle other than a right angle. 
     The width of the first pad portion  21  is greater than the width of the coil wiring portion  20 . The width of the first pad portion  21  is the same except for an end portion connected to the first end portion  20   a  of the coil wiring portion  20 . A width of the end portion of the first pad portion  21  gradually increases along an extending direction of the first pad portion  21 . 
     The second pad portion  22  is a portion to which the second columnar wiring  32  is connected. The second pad portion  22  is a portion overlapping the second columnar wiring  32  when viewed from the direction orthogonal to the first main surface  10   a,  has a shape corresponding to an outer peripheral surface of the second columnar wiring  32 , and is slightly greater than the second columnar wiring  32 . The second pad portion  22  extends in a direction that intersects the direction L (hereinafter also referred to as the connection direction L) in which the first end portion  20   a  and the second end portion  20   b  are connected and that is a direction in which the inner peripheral surface  20   c  of the coil wiring portion  20  is approached when viewed from the direction orthogonal to the first main surface  10   a.    
     In this embodiment, the second pad portion  22  extends in the direction orthogonal to the connection direction L. That is, the second pad portion  22  is disposed on a side of the second side surface  10   d  of the element body  10 , and extends along the second side surface  10   d  of the element body  10 . The second pad portion  22  is formed in a linear shape when viewed from the direction orthogonal to the first main surface  10   a.  Note that, the second pad portion  22  may extend in a direction intersecting the connection direction L at an angle other than a right angle. 
     A width of the second pad portion  22  is the same as the width of the first pad portion  21 , and greater than the width of the coil wiring portion  20 . The width of the second pad portion  22  is the same except for an end portion connected to the second end portion  20   b  of the coil wiring portion  20 . A width of the end portion of the second pad portion  22  gradually increases along an extending direction of the second pad portion  22 . 
     The first pad portion  21  is connected to the first columnar wiring  31 , and the second pad portion  22  is connected to the second columnar wiring  32 . The first columnar wiring  31  and the second columnar wiring  32  extend respectively from both ends of the coil  15  in the direction orthogonal to the first main surface  10   a.    
     Here, in this embodiment, the first pad portion  21  and the second pad portion  22  are not included in a turn of the coil  15 . This is because the first and second pad portions  21  and  22  are not portions that affect a wiring length of the coil  15 . More specifically, a current flowing through the first pad portion  21  flows through the first columnar wiring  31  as is, and a current flowing through the second pad portion  22  flows through the second columnar wiring  32  as is. In other words, a current flowing through the first pad portion  21  flows along the first columnar wiring  31  in the direction orthogonal to the first main surface  10   a,  rather than flowing along the circumferential direction of the coil wiring portion  20 , and a current flowing through the second pad portion  22  flows along the second columnar wiring  32  in the direction orthogonal to the first main surface  10   a,  rather than flowing along the circumferential direction of the coil wiring portion  20 . 
     A thickness of each of the coil wiring portion  20 , the first pad portion  21 , and the second pad portion  22  is preferably equal to or greater than 40 μm, and equal to or less than 120 μm, for example. As a working example of the coil wiring portion  20 , the thickness is 35 μm, and a wiring width is 50 μm. 
     Each of the coil wiring portion  20 , the first pad portion  21 , and the second pad portion  22  is made of a conductive material, for example, made of a metal material having low electric resistance such as Cu, Ag, Au, or Al. In the present embodiment, the inductor component  1  includes only one layer of the coil wiring portion  20 , and thus a reduction in height of the inductor component  1  can be realized. Note that, the coil wiring portion may have a two-layer configuration of a seed layer and an electrolytic plating layer, and may contain Ti or Ni as the seed layer. 
     A first extended wiring  201  is connected to a part on a side in the reverse X direction of the coil wiring portion  20 , and the first extended wiring  201  is exposed from the first side surface  10   c.  A second extended wiring  202  is connected to a part on a side in the forward X direction of the coil wiring portion  20 , and the second extended wiring  202  is exposed from the second side surface  10   d.    
     The first extended wiring  201  and the second extended wiring  202  are each a wiring to be connected to a power supply wiring when electrolytic plating is additionally performed after forming a shape of the coil wiring portion  20  in a manufacturing process of the inductor component  1 . In an inductor substrate state before the inductor component  1  is made as an individual piece, by using the power supply wiring, electrolytic plating can be easily performed additionally, and a line width of the coil  15  can be adjusted. In addition, by providing the first extended wiring  201  and the second extended wiring  202 , it is possible to secure strength in cutting of the element body  10  when the inductor component  1  is made as an individual piece, and to improve yield at the time of manufacturing. 
     Each of the first columnar wiring  31  and the second columnar wiring  32  extends from the coil  15  in the Z direction, and penetrates an inside of the second magnetic layer  12 . The columnar wiring is an example of a “vertical wiring” described in the claims. 
     The first columnar wiring  31  extends from an upper surface of the first pad portion  21  to the first main surface  10   a  of the element body  10 , and an end surface of the first columnar wiring  31  is exposed from the first main surface  10   a  of the element body  10 . The second columnar wiring  32  extends from an upper surface of the second pad portion  22  to the first main surface  10   a  of the element body  10 , and an end surface of the second columnar wiring  32  is exposed from the first main surface  10   a  of the element body  10 . 
     Thus, the first columnar wiring  31  and the second columnar wiring  32  linearly extend from the coil  15  to the first main surface  10   a  in the direction orthogonal to the first main surface  10   a.  Thus, each of the first external terminal  41  and the second external terminal  42  can be connected to the coil  15  with a shorter distance, and the inductor component  1  can be reduced in resistance, and increased in inductance. The first columnar wiring  31  and the second columnar wiring  32  are made of a conductive material, and for example, made of the same material as that of the coil  15 . 
     When viewed from the direction orthogonal to the first main surface  10   a,  the first columnar wiring  31  has substantially the same size as that of the first pad portion  21 , and has a shape corresponding to the first pad portion  21 . The second columnar wiring  32  has substantially the same size as that of the second pad portion  22 , and has a shape corresponding to the second pad portion  22 . 
     Note that, when an upper surface of the coil  15  is covered with the insulating layer  60 , each of the first columnar wiring  31  and the second columnar wiring  32  may be electrically connected to the coil  15  through via wiring that penetrates the insulating layer  60 . The via wiring is a conductor having a line width (diameter, sectional area) less than that of the columnar wiring. In this case, a “vertical wiring” described in the claims is configured with the via wiring and the columnar wiring. 
     At this time, the first pad portion  21  is a portion to which a first vertical wiring (the first columnar wiring  31  and the via wiring) is connected. The first pad portion  21  includes not only the portion connected to the via wiring but also a portion overlapping the first columnar wiring  31  when viewed from the direction orthogonal to the first main surface  10   a . That is, the first pad portion  21  has a shape corresponding to an outer peripheral surface of the first vertical wiring, when viewed from the direction orthogonal to the first main surface  10   a,  and is slightly greater than the first vertical wiring. 
     The second pad portion  22  is a portion to which a second vertical wiring (the second columnar wiring  32  and the via wiring) is connected. The second pad portion  22  includes not only the portion connected to the via wiring but also a portion overlapping the second columnar wiring  32  when viewed from the direction orthogonal to the first main surface  10   a.  That is, the second pad portion  22  has a shape corresponding to an outer peripheral surface of the second vertical wiring when viewed from the direction orthogonal to the first main surface  10   a,  and is slightly greater than the second vertical wiring. 
     Preferably, a thickness of the coil  15  is less than a thickness of each of the first columnar wiring  31  and the second columnar wiring  32 . According to this, the volume of the element body  10  can be increased, and the inductance can be increased. 
     Preferably, a thickness of the first magnetic layer  11  is greater than a thickness of the second magnetic layer  12 . According to this, since there is a limit in a thickness related to a process such as a resist thickness for each of the first columnar wiring  31  and the second columnar wiring  32 , there is a limit in the thickness of the second magnetic layer  12 . On the other hand, inductance can be increased by increasing the thickness of the first magnetic layer  11 . 
     The first external terminal  41  and the second external terminal  42  are provided on the first main surface  10   a  of the element body  10 . The first external terminal  41  and the second external terminal  42  are each made of a conductive material, and have a three-layer configuration in which, for example, Cu with low electric resistance and excellent in stress resistance, Ni excellent in corrosion resistance, and Au excellent in wettability and reliability are arranged in this order from an inner side to an outer side. 
     The first external terminal  41  is in contact with an end surface of the first columnar wiring  31  exposed from the first main surface  10   a  of the element body  10 , and is electrically connected to the first columnar wiring  31 . Thus, the first external terminal  41  is electrically connected to a first end (first pad portion  21 ) of the coil  15 . The second external terminal  42  is in contact with an end surface of the second columnar wiring  32  exposed from the first main surface  10   a  of the element body  10 , and is electrically connected to the second columnar wiring  32 . Thus, the second external terminal  42  is electrically connected to a second end (the second pad portion  22 ) of the coil  15 . 
     The first external terminal  41  is in contact with the first main surface  10   a  and the end surface of the first columnar wiring  31 . The second external terminal  42  is in contact with the first main surface  10   a  and the end surface of the second columnar wiring  32 . According to this, since the first external terminal  41  spreads across the first main surface  10   a  and the first columnar wiring  31 , and the second external terminal  42  spreads across the first main surface  10   a  and the second columnar wiring  32 , sizes of the respective first and second external terminals  41  and  42  can be controlled, and design of the first and second external terminals  41  and  42  can be selected from a viewpoint of mounting properties and mechanical strength. 
     Each of the first external terminal  41  and the second external terminal  42  is preferably in contact with the magnetic powder of the element body  10 . According to this, adhesion strength between each of the first external terminal  41  and the second external terminal  42 , and the element body  10  is improved. 
     The insulating layer  60  covers a lower surface of the coil  15 . Thus, insulation properties of the coil  15  can be improved. The insulating layer  60  is made of an insulating material that does not contain a magnetic substance. The insulating layer  60  is, for example, an organic resin such as an epoxy resin, a phenol resin, a polyimide resin, a liquid crystal polymer, or a combination thereof, a sintered body such as glass or alumina, or a thin film such as a silicon oxide film, a silicon nitride film, or a silicon oxynitride film. 
     The coating film  50  is made of an insulating material. The material of the coating film  50  is, for example, the same as the material of the insulating layer  60 . The coating film  50  exposes respective end surfaces of the first and second external terminals  41  and  42 . With the coating film  50 , a short circuit between the first external terminal  41  and the second external terminal  42  can be suppressed. Preferably, the coating film  50  contains a black colorant. With this, it is possible to hide scratches on the surface of the element body  10 , and to improve a rate of good appearance. The black colorant is, for example, a colorant to which a number including black is assigned in a color index, and specific examples thereof include carbon black-based pigments such as carbon black, ketjen black, perylene black, and titanium oxide, and graphite-based pigments, iron oxide-based pigments, cobalt oxide-based pigments, and anthraquinone-based pigments. 
     According to the above-described configuration, the first pad portion  21  extends in a direction that intersects the connection direction L and that is a direction in which the inner peripheral surface  20   c  of the coil wiring portion  20  is approached, and the second pad portion  22  extends in a direction that intersects the connection direction L and that is a direction in which the inner peripheral surface  20   c  of the coil wiring portion  20  is approached. According to this, it is possible to prevent the first pad portion  21  and the second pad portion  22  from approaching each other, and to reduce a possibility of a short circuit between the first pad portion  21  and the second pad portion  22  having a greatest potential difference in the coil  15 . In addition, it is possible to prevent the first pad portion  21  and the second pad portion  22  from extending outward in the radial direction of the coil  15 , to reduce the inductor component  1  in size. Additionally, an area of the first pad portion  21  can be increased, and connection reliability between the first pad portion  21  and the first columnar wiring  31  can be improved. 
     On the other hand, for example, when the first pad portion and the second pad portion are extended in the connection direction L, the first pad portion and the second pad portion come close to each other and are highly likely to be short-circuited. In addition, when the first pad portion and the second pad portion are extended outward in the radial direction of the coil, it is necessary to increase the element body in size, and the inductor component is increased in size. 
       FIG.  3    is a plan view of the inductor component. In  FIG.  3   , for convenience, only the element body  10  and the coil  15  are drawn, and these are illustrated by solid lines. As illustrated in  FIG.  3   , when viewed from the direction orthogonal to the first main surface  10   a , the first pad portion  21  has a linear first plane  211  that is a distal end surface in the extending direction of the first pad portion  21 , and faces the inner peripheral surface  20   c  of the coil wiring portion  20 . A shortest distance between the first plane  211  and the inner peripheral surface  20   c  of the coil wiring portion  20  is not a minimum among lengths between an outer surface of the first pad portion  21  and the inner peripheral surface  20   c  of the coil wiring portion  20 . According to this, it is possible to reduce a possibility of a short circuit between the first plane  211  of the first pad portion  21  and the inner peripheral surface  20   c  of the coil wiring portion  20 . 
     To be specific, when viewed from the direction orthogonal to the first main surface  10   a,  the first pad portion  21  has the linear first plane  211  extending in the connection direction L and facing the inner peripheral surface  20   c  of the coil wiring portion  20 , and the linear second plane  212  extending in the direction orthogonal to the connection direction L and facing the inner peripheral surface  20   c  of the coil wiring portion  20 . The first plane  211  refers to a surface at a location closest to the inner peripheral surface  20   c  of the coil wiring portion  20  among surfaces extending in parallel to the connection direction L. The second plane  212  refers to a surface at a location closest to the inner peripheral surface  20   c  of the coil wiring portion  20  among surfaces extending in the direction orthogonal to the connection direction L. 
     A surface parallel to the first plane  211  and tangent to a part, of the inner peripheral surface  20   c  of the coil wiring portion  20 , facing the first plane  211  is defined as a first virtual surface S 211 , and a surface parallel to the second plane  212  and tangent to a part, of the inner peripheral surface  20   c  of the coil wiring portion  20 , facing the second plane  212  is defined as a second virtual surface S 212 . At this time, a first distance a between the second virtual surface S 212  and the second plane  212  is less than a second distance b between the first virtual surface S 211  and the first plane  211 . 
     According to the above-described configuration, since the first distance a is less than the second distance b, it is possible to reduce a possibility of a short circuit between the first plane  211  of the first pad portion  21  and a part, of the inner peripheral surface  20   c  of the coil wiring portion  20 , facing the first plane  211 . Even if a short circuit occurs between the second virtual surface S 212  and the second plane  212 , a variation in a coil length is suppressed as compared to a case where a short circuit occurs between the first virtual surface S 211  and the first plane  211 , and thus influence of a layer short can be suppressed. 
     Note that, the first distance a may be equal to or greater than the second distance b. In this case, the first pad portion  21  can be increased in the extending direction thereof. Thus, a size of the first pad portion  21  can be increased, and the connection reliability between the first pad portion  21  and the first columnar wiring  31  can be improved. 
     Also, the second pad portion  22  may have a similar configuration to that of the first pad portion  21 , and has a similar effect to that of the first pad portion  21 . That is, when viewed from the direction orthogonal to the first main surface  10   a,  the second pad portion  22  has a linear first plane  221  that is a distal end surface in the extending direction of the second pad portion  22  and that faces the inner peripheral surface  20   c  of the coil wiring portion  20 . A shortest distance between the first plane  221  and the inner peripheral surface  20   c  of the coil wiring portion  20  is not a minimum among lengths between an outer surface of the second pad portion  22  and the inner peripheral surface  20   c  of the coil wiring portion  20 . 
     To be specific, the second pad portion  22  has the linear first plane  221  extending in the connection direction L and facing the inner peripheral surface  20   c  of the coil wiring portion  20 , and a linear second plane  222  extending in the direction orthogonal to the connection direction L and facing the inner peripheral surface  20   c  of the coil wiring portion  20 . A surface parallel to the first plane  221  and tangent to a part, of the inner peripheral surface  20   c  of the coil wiring portion  20 , facing the first plane  221  is defined as a first virtual surface S 221 , and a surface parallel to the second plane  222  and tangent to a part, of the inner peripheral surface  20   c  of the coil wiring portion  20 , facing the second plane  222  is defined as a second virtual surface S 222 . At this time, the first distance a between the second virtual surface S 222  and the second plane  222  is less than the second distance b between the first virtual surface S 221  and the first plane  221 . Note that, the first distance a may be equal to or greater than the second distance b. 
     As illustrated in  FIG.  3   , in the first pad portion  21 , it is preferable that the first distance a between the second virtual surface S 212  and the second plane  212  be equal to or greater than twice the particle size D50 of the magnetic powder. 
     Here, unless otherwise specified, the particle size D50 of the magnetic powder is measured from a scanning electron microscope (SEM) image of a cross-section of a central portion in a longitudinal direction of the element body  10  of the inductor component  1 . At this time, the SEM image preferably includes 10 or more of the magnetic powders, and is acquired at a magnification of 2000 times, for example. The SEM image as described above is acquired at three or more locations from the above-described cross-section, the magnetic powder and the others are classified by binarization or the like, an equivalent circle diameter of the magnetic powder in the SEM image is calculated, and an intermediate value (median diameter) when the equivalent circle diameters are arranged in order of magnitude is defined as the particle size D50 of the magnetic powder. 
     According to the above-described configuration, by increasing the distance between the second virtual surface S 212  and the second plane  212  to be greater than the magnetic powder, it is possible to further reduce a possibility of a short circuit between the second virtual surface S 212  and the second plane  212 . 
     Also, the second pad portion  22  may have a similar configuration to that of the first pad portion  21 , and has a similar effect to that of the first pad portion  21 . That is, in the second pad portion  22 , the first distance a between the second virtual surface S 222  and the second plane  222  is equal to or greater than twice the particle size D50 of the magnetic powder. 
     As illustrated in  FIG.  3   , preferably, in the first pad portion  21 , the shortest distance c between the first pad portion  21  and the second pad portion  22  is greater than the first distance a between the second virtual surface S 212  and the second plane  212  when viewed from the direction orthogonal to the first main surface  10   a.    
     According to the above-described configuration, it is possible to further reduce the possibility of a short circuit between the first pad portion  21  and the second pad portion  22  having the greatest potential difference in the coil  15 . Even if a short circuit occurs between the second virtual surface S 212  and the second plane  212 , a variation in the coil length is suppressed compared to a case where a short circuit occurs between the first pad portion  21  and the second pad portion  22 , and thus influence of a layer short can be suppressed. 
     Note that, the shortest distance c may be equal to or less than the first distance a. In this case, since the first pad portion  21  and the second pad portion  22  can be brought close to each other, a length of the coil wiring portion  20  can be increased. Thus, the coil length can be increased, and the inductance can be increased. 
     Also, the second pad portion  22  may have a similar configuration to that of the first pad portion  21 , and has a similar effect to that of the first pad portion  21 . That is, in the second pad portion  22 , the shortest distance c is greater than the first distance a. Note that, the shortest distance c may be equal to or less than the first distance a. 
     As illustrated in  FIG.  3   , the shortest distance c between the first pad portion  21  and the second pad portion  22  is preferably equal to or greater than twice the particle size D50 of the magnetic powder. According to the above-described configuration, by increasing the distance between the first pad portion  21  and the second pad portion  22  to be greater than the magnetic powder, it is possible to further reduce the possibility of a short circuit between the first pad portion  21  and the second pad portion  22 . 
     As illustrated in  FIG.  3   , preferably, in the first pad portion  21 , the first distance a is less than the second distance b, and the second distance b is less than the shortest distance c. For example, the first distance a is 200 μm, the second distance b is 210 μm, and the shortest distance c is 720 μm. According to the above-described configuration, since the shortest distance c is greater than the first distance a and the second distance b, it is possible to further reduce the possibility of a short circuit between the first pad portion  21  and the second pad portion  22  having the greatest potential difference. Note that, the second distance b may be less than the shortest distance c regardless of a magnitude relation between the first distance a and the second distance b. 
     Also, the second pad portion  22  may have a similar configuration to that of the first pad portion  21 , and has a similar effect to that of the first pad portion  21 . 
     Manufacturing Method 
     Next, a manufacturing method of the inductor component  1  will be described.  FIG.  4 A  to  FIG.  4 M  correspond to the A-A section ( FIG.  2   ) in  FIG.  1   . 
     As illustrated in  FIG.  4 A , a base substrate  70  is prepared. The base substrate  70  is made of an inorganic material such as ceramic, glass, or silicon, for example. An insulating layer  71  is applied to the base substrate  70 . As illustrated in  FIG.  4 B , a predetermined pattern is formed and cured on the insulating layer  71  using a photolithography method, to form the insulating layer  60 . 
     As illustrated in  FIG.  4 C , a seed layer (Ti/Cu) (not illustrated) is formed on a main surface of the base substrate  70  including an upper surface of the insulating layer  60  by a known method such as a sputtering method or a vapor deposition method. Thereafter, a DFR (dry film resist)  75  is attached, and an opening having a predetermined shape is formed in the DFR  75  by using a photolithography method. Then, by using an electrolytic plating method, while feeding electricity to the seed layer, the coil wiring portion  20 , the first pad portion  21 , and the second pad portion  22  are formed on the insulating layer  60 . 
     As illustrated in  FIG.  4 D , the DFR  75  is peeled off. At this time, the seed layer may be used for electrolytic plating of a columnar wiring without etching the seed layer, or the seed layer may be etched to form a seed layer for forming a columnar wiring again. 
     As illustrated in  FIG.  4 E , the DFR  75  is attached again, and an opening having a predetermined shape is formed in the DFR  75  by using a photolithography method. The openings are through-holes respectively corresponding to a location where the first columnar wiring  31  is provided on the first pad portion  21 , and a location where the second columnar wiring  32  is provided on the second pad portion  22 . Using electrolytic plating, the first columnar wiring  31  is provided on the first pad portion  21 , and the second columnar wiring  32  is provided on the second pad portion  22 . As illustrated in  FIG.  4 F , the DFR  75  is peeled off and the seed layer is etched. 
     As illustrated in  4 G, a magnetic sheet to be the second magnetic layer  12  is pressure-bonded from above the main surface of the base substrate  70  toward the coil wiring portion  20 , and the coil wiring portion  20 , the first pad portion  21 , the second pad portion  22 , the first columnar wiring  31 , and the second columnar wiring  32  are covered with the second magnetic layer  12 . Thereafter, an upper surface of the second magnetic layer  12  is ground, and the end surface of the first columnar wiring  31  and the end surface of the second columnar wiring  32  are exposed from the upper surface of the second magnetic layer  12 . 
     As illustrated in  FIG.  4 H , the coating film  50  is applied to the upper surface of the second magnetic layer  12 . Then, the coating film  50  is formed into a predetermined pattern and cured by using a photolithography method. The predetermined pattern has a shape having an opening at a location corresponding to the first external terminal  41  and an opening at a location corresponding to the second external terminal  42 . 
     As illustrated in  FIG.  4 I , the base substrate  70  is removed by polishing. At this time, a part or all of the insulating layer  60  may be removed. As illustrated in  FIG.  4 J , another magnetic sheet to be the first magnetic layer  11  is pressure-bonded from below the coil wiring portion  20  toward the coil wiring portion  20 , and the coil wiring portion  20  is covered with the first magnetic layer  11 . Thereafter, the first magnetic layer  11  is ground to have a predetermined thickness. 
     As illustrated in  FIG.  4 K , the first external terminal  41  and the second external terminal  42  are formed in the openings of the coating film  50 , respectively. The first external terminal  41  is in contact with the end surface of the first columnar wiring  31  and the upper surface of the second magnetic layer  12 . The second external terminal  42  is in contact with the end surface of the second columnar wiring  32  and the upper surface of the second magnetic layer  12 . Further, the coating film  50  is applied to a lower surface of the first magnetic layer  11 , and cured. 
     As illustrated in  FIG.  4 L , an inductor component is made as an individual piece along cut lines D, and as illustrated in  FIG.  4 M , the inductor component  1  is manufactured. 
     WORKING EXAMPLES 
     Next, working examples will be described. 
       FIG.  5 A  illustrates an inductor component  100 A of a first comparative example, and  FIG.  5 B  illustrates an inductor component  100 B of a second comparative example.  FIG.  5 C  illustrates an inductor component  1 A of a first working example, and  FIG.  5 D  illustrates an inductor component  1 B of a second working example. In each of  FIG.  5 A  to  FIG.  5 D , only an element body, a coil, and external terminals are illustrated for convenience, the element body and the coil are indicated by solid lines, and the external terminals are indicated by two dot chain lines. Although a columnar wiring is omitted, the columnar wiring has substantially the same size as that of a pad portion when viewed from the Z direction, and has a shape corresponding to the pad portion. 
     As illustrated in  5 A, in the inductor component  100 A of the first comparative example, each of a first pad portion  121 A and a second pad portion  122 A is quadrangular, and has a size of 100 μm×100 μm. A distance between a first external terminal  141 A and a second external terminal  142 A is 200 μm. 
     As illustrated in  FIG.  5 B , in the inductor component  100 B of the second comparative example, a first pad portion  121 B extends in the forward X direction as compared to the first pad portion  121 A in  FIG.  5 A , and a second pad portion  122 B extends in the reverse X direction as compared to the second pad portion  122 A in  FIG.  5 A . Hereinafter, a length difference in the X direction between the first pad portion  121 B and the first pad portion  121 A, and a length difference in the X direction between the second pad portion  122 B and the second pad portion  122 A are each referred to as an extension amount of a pad portion. A distance between a first external terminal  141 B and a second external terminal  142 B is the same as the distance between the first external terminal  141 A and the second external terminal  142 A in  FIG.  5 A . 
     As illustrated in  FIG.  5 C , in the inductor component  1 A of the first working example, a first pad portion  21 A extends in the forward Y direction as compared to the first pad portion  121 A in  FIG.  5 A , and a second pad portion  22 A extends in the forward Y direction as compared to the second pad portion  122 A in  FIG.  5 A . Hereinafter, a length difference in the Y direction between the first pad portion  21 A and the first pad portion  121 A, and a length difference in the Y direction between the second pad portion  22 A and the second pad portion  122 A are each referred to as an extension amount of a pad portion. A distance between a first external terminal  41 A and a second external terminal  42 A is the same as the distance between the first external terminal  141 A and the second external terminal  142 A in  FIG.  5 A . 
     As illustrated in  FIG.  5 D , in the inductor component  1 B of the second working example, a first pad portion  21 B has the same shape as that of the first pad portion  21 A in  FIG.  5 C , and a second pad portion  22 B has the same shape as that of the second pad portion  22 A in  FIG.  5 C . A distance between a first external terminal  41 B and a second external terminal  42 B is 600 μm, which is greater than the distance between the first external terminal  41 A and the second external terminal  42 A in  FIG.  5 C . 
       FIG.  6    shows a relationship between relative values of an L value and extension amounts of pad portions in the above first comparative example, the above second comparative example, the above first working example, and the above second working example.  FIG.  7    is a graph of an enlarged part of  FIG.  6   . 
     In  FIG.  6    and  FIG.  7   , an x mark denotes the first comparative example, a triangle mark denotes the second comparative example, a square mark denotes the first working example, and a circle mark denotes the second working example. A relative value of an L value indicates a relative value when an L value of the first comparative example is defined as  1 . As described above, an extension amount of a pad portion refers to a length difference from a pad portion of the first comparative example. 
     As shown in  FIG.  6    and  FIG.  7   , in each of the second comparative example and the first working example, the relative value of the L value slightly decreased as the extension amount of the pad portion increased. It is considered that this is because volume of the magnetic layer decreases. The decrease in the relative value of the L value is within an allowable range at the time of manufacturing, and there is no problem in quality. On the other hand, in each of the second comparative example and the first working example, as the extension amount of the pad portion increases, an area of the columnar wiring also increases, and as a result, a contact area with the external terminal increases, and connection reliability is improved. 
     In the second working example, the relative value of the L value is greater, as compared to the first working example. This is because, since the distance between the two external terminals in the second working example is greater than the distance between the two external terminals in the first working example, it is possible to reduce obstruction of a flow of magnetic flux of the coil by the external terminals in the second working example. 
     As described above, in each of the first comparative example, the second comparative example, the first working example, and the second working example, the L value can be ensured. However, in the first comparative example, since the pad portion is small, a contact area with the external terminal is small, and connection reliability is lowered. Further, in the second comparative example, there is a high possibility that the two pad portions come close to each other and are short-circuited. On the other hand, in the first working example and the second working example, since a contact area with the external terminal is increased, connection reliability is improved, and since the two pad portions do not come close to each other, a possibility of a short circuit can be reduced. Furthermore, in the second working example, it is possible to reduce obstruction of a flow of magnetic flux and to suppress a decrease in the L value. 
     Second Embodiment 
       FIG.  8    is a plan view illustrating a second embodiment of the inductor component. In  FIG.  8   , for convenience, only an element body and a coil are drawn, and these are illustrated by solid lines. The second embodiment is different from the first embodiment in a configuration of a pad portion of a coil. This different configuration will be described below. The other configurations are the same as those of the first embodiment, and are denoted by the same reference numerals as those of the first embodiment, and description thereof will be omitted. 
     As illustrated in  FIG.  8   , in an inductor component  1 C of the second embodiment, a first pad portion  21 C of a coil  15 C has a first portion  21   a,  a second portion  21   b,  and a corner portion  21   c  between the first portion  21   a  and the second portion  21   b  when viewed from a direction orthogonal to the first main surface  10   a.  The corner portion  21   c  is an extension of the first portion  21   a  and is included in the first portion  21   a.    
     The first portion  21   a  extends from the first end portion  20   a  in the connection direction L. The second portion  21   b  extends from a side of the first portion  21   a  in a direction that intersects the connection direction L and that is a direction in which the inner peripheral surface  20   c  of the coil wiring portion  20  is approached. Each of the first portion  21   a  and the second portion  21   b  is a portion extending with the same width. In  FIG.  8   , for convenience, a boundary between each of the first portion  21   a  and the second portion  21   b , and the corner portion  21   c  is indicated by a two dot chain line. In this embodiment, the second portion  21   b  extends in a direction orthogonal to the connection direction L. That is, the first pad portion  21 C is formed in an L-shape when viewed from the direction orthogonal to the first main surface  10   a.    
     A first columnar wiring connected to the first pad portion  21 C has a shape corresponding to the first pad portion  21 C when viewed from the direction orthogonal to the first main surface  10   a.  Thus, an area of the first pad portion  21 C can be increased, and connection reliability between the first pad portion  21 C and the first columnar wiring can be improved. 
     When viewed from the direction orthogonal to the first main surface  10   a,  the first portion  21   a  of the first pad portion  21 C protrudes inward in a radial direction of the coil  15 C from the inner peripheral surface  20   c  of the coil wiring portion  20 . The first plane  211  is a surface at a location closest to the inner peripheral surface  20   c  of the coil wiring portion  20  among surfaces extending in parallel to the connection direction L of the first pad portion  21 C, and thus corresponds to a surface on a distal end side of the second portion  21   b.  The second plane  212  is a surface at a location closest to the inner peripheral surface  20   c  of the coil wiring portion  20  among surfaces extending in the direction orthogonal to the connection direction L of the first pad portion  21 C, and thus corresponds to a surface on a base end side (side of the first end portion  20   a ) of the first portion  21   a.  In this case, the first distance a between the second virtual plane S 212  and the second plane  212  can be easily made less than the second distance b between the first virtual surface S 211  and the first plane  211 . The first distance a may be the same as the second distance b, and for example, the first distance a is 100 μm, the second distance b is 100 μm, and the shortest distance c is 200 μm. 
     Similarly, a second pad portion  22 C of the coil  15 C has a first portion  22   a,  a second portion  22   b,  and a corner portion  22   c  between the first portion  22   a  and the second portion  22   b  when viewed from the direction orthogonal to the first main surface  10   a.    
     The first portion  22   a  extends from the second end portion  20   b  in the connection direction L. The second portion  22   b  extends from a side of the first portion  22   a  in a direction that intersects the connection direction L and that is a direction in which the inner peripheral surface  20   c  of the coil wiring portion  20  is approached. In this embodiment, the second portion  21   b  extends in the direction orthogonal to the connection direction L. In other words, the second pad portion  22 C is formed in an L-shape when viewed from the direction orthogonal to the first main surface  10   a,  and is formed symmetrically with the first pad portion  21 C. 
     A second columnar wiring connected to the second pad portion  22 C has a shape corresponding to the second pad portion  22 C when viewed from the direction orthogonal to the first main surface  10   a.  Thus, an area of the second pad portion  22 C can be increased, and connection reliability between the second pad portion  22 C and the second columnar wiring can be improved. 
     When viewed from the direction orthogonal to the first main surface  10   a,  the first portion  22   a  of the second pad portion  22 C protrudes inward in the radial direction of the coil  15 C from the inner peripheral surface  20   c  of the coil wiring portion  20 . The first plane  221  corresponds to a surface on a distal end side of the second portion  22   b.  The second plane  222  corresponds to a surface on a base end side (side of the second end portion  20   b ) of the first portion  22   a.    
     Third Embodiment 
       FIG.  9    is a plan view illustrating a third embodiment of the inductor component. In  FIG.  9   , for convenience, only an element body and a coil are drawn, and these are illustrated by solid lines. The third embodiment is different from the second embodiment in a configuration of a pad portion of a coil. This different configuration will be described below. The other configurations are the same as those of the second embodiment, and are denoted by the same reference numerals as those of the second embodiment, and description thereof will be omitted. Note that, although the configuration of the pad portion is different from that of the second embodiment, a first portion and a second portion of the pad portion are defined in the same manner as those of the second embodiment. 
     As illustrated in  FIG.  9   , in an inductor component  1 D of the third embodiment, the first portion  21   a  of a first pad portion  21 D of a coil  15 D does not protrude inward in a radial direction of the coil  15 D from the inner peripheral surface  20   c  of the coil wiring portion  20  when viewed from a direction orthogonal to the first main surface  10   a.  In other words, the first portion  21   a  protrudes outward in the radial direction from an outer peripheral surface of the coil wiring portion  20 . At this time, the first plane  211  corresponds to a surface on a distal end side of the second portion  21   b,  and the second plane  212  corresponds to a side surface of the second portion  21   b.    
     According to the above-described configuration, it is possible to increase a distance between the inner peripheral surface  20   c  of the coil wiring portion  20  and the first pad portion  21 D in the connection direction L, and to further reduce a possibility of a short circuit between the coil wiring portion  20  and the first pad portion  21 D in the connection direction L. For example, the first distance a between the second virtual plane S 212  and the second plane  212  can be easily made greater than the second distance b between the first virtual surface S 211  and the first plane  211 . For example, the first distance a is 200 μm, the second distance b is 100 μm, and the shortest distance c is 200 μm. 
     Similarly, the first portion  22   a  of a second pad portion  22 D of the coil  15 D does not protrude inward in the radial direction of the coil  15 D from the inner peripheral surface  20   c  of the coil wiring portion  20  when viewed from the direction orthogonal to the first main surface  10   a.  In other words, the first portion  22   a  protrudes outward in the radial direction from the outer peripheral surface of the coil wiring portion  20 . At this time, the first plane  221  corresponds to a surface on a distal end side of the second portion  22   b,  and the second plane  222  corresponds to a side surface of the second portion  22   b.    
     According to the above-described configuration, it is possible to increase a distance between the inner peripheral surface  20   c  of the coil wiring portion  20  and the second pad portion  22 D in the connection direction L, and to further reduce a possibility of a short circuit between the coil wiring portion  20  and the second pad portion  22 D in the connection direction L. 
     Fourth Embodiment 
       FIG.  10    is a sectional view illustrating an embodiment of a mounting component. As illustrated in  FIG.  10   , a mounting component  3  includes a substrate  300  and an inductor component  1 E disposed in the substrate  300 . 
     The inductor component  1 E has the configuration of the inductor component  1  illustrated in the first embodiment and does not include the first external terminal  41 , the second external terminal  42 , and the coating film  50 . 
     The substrate  300  has a main body portion  310 , an internal wiring  320 , and an external wiring  330 . The main body portion  310  is made of, for example, an insulating material. The internal wiring  320  is provided in the main body portion  310 . The external wiring  330  is provided on a main surface  310   a  of the main body portion  310 . The internal wiring  320  is connected to the first columnar wiring  31  and the second columnar wiring  32  in the inductor component  1 E. The internal wiring  320  is connected to the external wiring  330 . Thus, the inductor component  1 E is electrically connected to the external wiring  330 . 
     According to the above-described configuration, since the inductor component  1 E is built into the substrate  300 , it is possible to increase a mounting area of a surface of the substrate  300 . 
     Note that, the present disclosure is not limited to the above-described embodiments, and design changes can be made without departing from the scope of the present disclosure. For example, the features of the first to fourth embodiments may be combined in various ways. 
     In the above-described embodiments, at least a part of the first pad portion extends in the direction orthogonal to the connection direction L, but may extend in a direction intersecting the connection direction L at an angle other than a right angle. Similarly, at least a part of the second pad portion extends in the direction orthogonal to the connection direction L, but may extend in a direction intersecting the connection direction L at an angle other than a right angle. 
     In the above-described embodiments, the shape of each of the first pad portion and the second pad portion is formed in the linear shape or the L-shape, but may be any shape as long as the shape has a part extending in a direction, that intersects the connection direction L and that is a direction in which the inner peripheral surface of the coil wiring portion is approached.