Inductor component

Abstract

The present invention provides an inductor component in which a wire is wound around a winding core portion of a drum-shaped core to form a plurality of multi-layer winding portions, and a resin coating member is provided so as to extend between top surfaces of both flange portions of the core and to fill a portion of the wire, in which the resin coating member is less likely to generate cracks. The rewinding portion of the multi-layer winding portion (M1, M2, M3) embedded in the resin coating member (35) is located at a position facing a surface of the winding core portion (12) other than the winding core top surface (30), and turns of the wire (16) forming a first layer, which is a layer closest to the peripheral surface of the winding core portion (12), among the multi-layer winding portion (M1, M2, M3) are wound around the winding core portion (12). Adjacent turns of the wire (16) located between adjacent portions of the multi-layer winding portions (M1, M2, and M3) are in contact with each other or form only a gap that is less than or equal to the radius of the wire (16).

Description

Technical Field

[0001] The present invention relates to an inductor component, and more particularly to an inductor component having a structure including a drum-shaped core having a winding core portion, and a wire material wound in a plurality of layers around the winding core portion of the drum-shaped core. Background Art

[0002] For example, Japanese Patent Publication No. 2016-86034 (Patent Document 1) describes an inductor component having a structure in which a wire is wound around a winding core portion of a drum-shaped core, and the wire is wound through a rewinding portion that moves from a lower layer side to an upper layer side to form a multilayer winding portion having multiple layers.

[0003] Fig.15 From patent document 1 Figure 5 The figure cited in , shows a conventional inductive component 1 of interest for the present invention in a top view.

[0004] Reference Fig.15 The inductor component 1 includes: a drum core 5 having a winding core portion 2 and a first flange portion 3 and a second flange portion 4 respectively provided at opposite ends of the winding core portion 2 in the axial direction; and a wire 6 wound around the winding core portion 2.

[0005] The first flange portion 3 and the second flange portion 4 are provided with a first terminal electrode and a second terminal electrode to which the ends of the wire 6 are connected, respectively. Fig.15 The first flange portion 3 and the second flange portion 4 have flange bottom surfaces facing the mounting substrate (not shown) and provided with the first terminal electrode and the second terminal electrode, respectively. Fig.15 In the figure, the flange bottom surface is not shown, and the flange top surfaces 7 and 8 facing the opposite direction to the flange bottom surface are shown. Fig.15 The winding core portion 2 shown is arranged such that the winding core top surface 9 faces forward, and the winding core top surface 9 faces in the opposite direction to the winding core bottom surface facing the mounting substrate side.

[0006] The wire 6 forms multi-layered winding portions M1 and M2 wound in multiple layers with the rewinding portions R1 and R2 sandwiched between the lower and upper layers. The multi-layered winding portions M1 and M2 are distributed at multiple locations in the axial direction of the winding core 2 .

[0007] The multi-layer winding portions M1 and M2 help to increase the number of turns of the wire 6 as much as possible within the limited space provided by the winding core 2 for winding the wire 6 , thereby increasing the inductance of the inductor component 1 .

[0008] Patent Document 1: Japanese Patent Application Publication No. 2016-86034

[0009] Although not described in Patent Document 1, the inductor component 1 may further include a resin-coated component extending between the flange top surface 7 of the first flange portion 3 and the flange top surface 8 of the second flange portion 4. If the resin-coated component is composed of, for example, a resin containing ferrite powder or metal magnetic powder, and the drum-shaped core 5 is composed of, for example, ferrite or a resin containing ferrite powder or metal magnetic powder, a closed magnetic circuit can be formed by the drum-shaped core 5 and the resin-coated component.

[0010] When the resin coating member is provided to extend between flange top surface 7 of first flange portion 3 and flange top surface 8 of second flange portion 4 , the resin coating member fills a portion of wire 6 located on the core top surface 9 side of core portion 2 .

[0011] As mentioned above, in Fig.15 In the figure, the winding core portion 2 is shown with the winding core top surface 9 facing forward. Fig.15 As shown, in the portion covering the top surface 9 of the winding core and where the rewinding portions R1 and R2 are present, a relatively large gap G is formed between the turns of the wire 6 .

[0012] In this case, the thickness of the resin-coated component at the portion filling the gap G is greatly increased, and the volume of the resin filling the gap G is greatly increased. Generally, it is known that the larger the volume of the resin, the greater the stress load due to the expansion and contraction of the resin. Therefore, as described above, if the volume of the resin filling the gap G is greatly increased, the stress load due to the expansion and contraction becomes greater, and a local stress concentration portion is generated in the resin-coated component.

[0013] In addition, the presence of the rewinding portions R1 and R2 in the portion covering the core top surface 9 further increases the degree of unevenness in the thickness of the resin-coated member.

[0014] These may become causes of cracks in the resin-coated parts. Summary of the invention

[0015] Therefore, an object of the present invention is to provide an inductor component in which cracks are unlikely to occur in a resin-coated component.

[0016] The inductor component of the present invention comprises: a drum-shaped core having a winding core portion and a first flange portion and a second flange portion respectively arranged at opposite ends of the winding core portion in the axial direction; a wire with a circular cross-section wound around the winding core portion; and a first terminal electrode and a second terminal electrode respectively arranged on the first flange portion and the second flange portion, and respectively connected to each end of the wire.

[0017] The core portion has an outer peripheral surface, which has at least a core bottom surface facing the mounting substrate side and a core top surface facing the direction opposite to the core bottom surface. The first flange portion and the second flange portion have an outer peripheral surface, which has at least a flange bottom surface facing the mounting substrate side and a flange top surface facing the direction opposite to the flange bottom surface.

[0018] The first terminal electrode and the second terminal electrode are provided on at least flange bottom surfaces of the first flange portion and the second flange portion, respectively.

[0019] The inductor component of the present invention further includes a resin coating member that extends between the flange top surface of the first flange portion and the flange top surface of the second flange portion and fills a portion of the wire located on the core top surface side of the core portion.

[0020] The wire material forms a multi-layer winding portion that is wound into a plurality of layers with a rewinding portion sandwiched between a lower layer side and an upper layer side.

[0021] In order to solve the above-mentioned technical problems, the present invention is characterized by having the following structure.

[0022] The rewinding portion is located at a position covering a surface of the outer peripheral surface of the winding core portion other than the core top surface.

[0023] In addition, the multi-layer winding parts are distributed at multiple locations in the axial direction of the winding core part, and regarding the turns of the wire material in the multi-layer winding parts, which constitute the layer closest to the peripheral surface of the winding core part, that is, the first layer, the adjacent turns of the wire material located between adjacent multi-layer winding parts are in contact with each other, or only a gap below the radius of the wire material is formed.

[0024] According to the present invention, adjacent turns of the wire material constituting the first layer between adjacent multilayer winding portions are in contact with each other or have a gap equal to or smaller than the radius of the wire material, thereby preventing the volume of the resin-coated member from being partially increased significantly.

[0025] In addition, since the rewinding portion in the multi-layered wound portion can be eliminated at a position covering the top surface of the core, the unevenness in thickness of the resin coating member provided along the top surface of the core can be reduced.

[0026] Therefore, cracks can be less likely to occur in the resin-coated member. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 1 is a front view showing an inductor component 11 according to an embodiment of the present invention, in which a resin coating component 35 is indicated by a dotted line.

[0028] Figure 2 yes Figure 1 A top view of the inductor component 11 is shown.

[0029] Figure 3 yes Figure 1 A bottom view of the inductor component 11 is shown.

[0030] Figure 4 Yes means Figure 1 The bottom view is a state at a relatively initial stage of the winding process of wire 16 in inductor component 11 shown.

[0031] Figure 5 It indicates the winding process of the wire 16. Figure 4 A bottom view of the state of the stage following the stage shown.

[0032] Figure 6 It indicates the winding process of the wire 16. Figure 5 A bottom view of the state of the stage following the stage shown.

[0033] Figure 7 It indicates the winding process of the wire 16. Figure 6 A bottom view of the state of the stage following the stage shown.

[0034] Figure 8 It indicates the winding process of the wire 16. Figure 7 A bottom view of the state of the stage following the stage shown.

[0035] Fig. 9 It indicates the winding process of the wire 16. Figure 8 A bottom view of the state of the stage following the stage shown.

[0036] Fig.10 It indicates the winding process of the wire 16. Fig. 9 A bottom view of the state of the stage following the stage shown.

[0037] Fig.11 It indicates the winding process of the wire 16. Fig.10 A bottom view of the state of the stage following the stage shown.

[0038] Fig.12 It indicates the winding process of the wire 16. Fig.11 A bottom view of the state of the stage following the stage shown.

[0039] Fig.13 Schematically Figure 1 A cross-sectional view showing the winding order of the wire 16 in the inductor component 11 is shown.

[0040] Fig.14 It is used to explain other embodiments of the present invention. Fig.13 The corresponding figure of (6).

[0041] Fig.15 From Patent Document 1 Figure 5 The figure cited in shows a top view of a conventional inductive component 1 of interest to the present invention.

[0042] Description of Reference Numerals

[0043] 11…inductor component; 12…winding core portion; 13…first flange portion; 14…second flange portion; 15…drum core; 16…wire 17, 18…flange bottom surface; 19, 20…flange top surface; 29…winding core bottom surface; 30…winding core top surface; 33…first terminal electrode; 34…second terminal electrode; 35…resin-coated component; M1, M2, M3…multilayer winding portion; R1, R2, R3…rewinding portion. DETAILED DESCRIPTION

[0044] Reference Figures 1 to 3 An inductor component 11 according to one embodiment of the present invention comprises: a drum-shaped core 15 having a winding core portion 12 and a first flange portion 13 and a second flange portion 14 respectively arranged at opposite ends of the winding core portion 12 in the axial direction; and a wire 16 wound around the winding core portion 12.

[0045] The drum core 15 is made of a non-conductive material, more specifically, a non-magnetic body such as alumina, a magnetic body such as ferrite, or a resin. Preferably, the resin contains, for example, ferrite powder or metal magnetic powder as a filler. The winding core 12, the first flange 13, and the second flange 14 of the drum core 15 are in the shape of a quadrangular prism with a quadrilateral cross-section. The "corners" and "corners" of the drum core 15 having the winding core 12 and the flanges 13 and 14 in the shape of a quadrangular prism may be chamfered.

[0046] More specifically, the first flange portion 13 has, on the outer peripheral surface, a flange bottom surface 17 facing the mounting substrate (not shown), a flange top surface 19 facing the opposite direction to the flange bottom surface 17, and a first flange side surface 21 and a second flange side surface 23 that connect the flange bottom surface 17 and the flange top surface 19 and are opposite to each other. In addition, the first flange portion 13 has an inner end surface 25 facing the winding core portion 12, and an outer end surface 27 facing the opposite direction to the inner end surface 25.

[0047] Similarly, the second flange portion 14 has, on the outer peripheral surface, a flange bottom surface 18 facing the mounting substrate side, a flange top surface 20 facing the direction opposite to the flange bottom surface 18, and a first flange side surface 22 and a second flange side surface 24 connecting the flange bottom surface 18 and the flange top surface 20 and facing each other. In addition, the second flange portion 14 has an inner end surface 26 facing the winding core portion 12 side, and an outer end surface 28 facing the direction opposite to the inner end surface 26.

[0048] The core portion 12 has an outer peripheral surface including a core bottom surface 29 facing the mounting substrate side, a core top surface 30 facing the opposite direction of the core bottom surface 29, and a first core side surface 31 and a second core side surface 32 connecting the core bottom surface 29 and the core top surface 30 and facing each other.

[0049] The wire 16 has a circular cross section and is made of, for example, a copper wire insulated with a resin such as polyester imide.

[0050] The inductor component 11 includes a first terminal electrode 33 and a second terminal electrode 34 provided on the first flange portion 13 and the second flange portion 14, respectively, to which ends of the wire 16 are connected. In the drawing, the regions where the first terminal electrode 33 and the second terminal electrode 34 are formed are indicated by dark colors.

[0051] The first terminal electrode 33 is provided on the flange bottom surface 17 of the first flange portion 13, and is preferably provided so as to extend from the flange bottom surface 17 to a portion of each of the adjacent first flange side surface 21, the second flange side surface 23, the inner end surface 25, and the outer end surface 27. Similarly, the second terminal electrode 34 is provided on the flange bottom surface 18 of the second flange portion 14, and is preferably provided so as to extend from the flange bottom surface 18 to a portion of each of the adjacent first flange side surface 22, the second flange side surface 24, the inner end surface 26, and the outer end surface 28.

[0052] The first terminal electrode 33 and the second terminal electrode 34 are formed by sintering a conductive paste containing silver as a conductive component, for example, and may be plated with Ni, Cu, and Sn in sequence as required. Alternatively, the terminal electrodes 33 and 34 may be provided by fixing terminal fittings made of conductive metal plates to the flanges 13 and 14.

[0053] like Figure 1As shown by the dotted line, the inductor component 11 has a resin-coated component 35, which is provided to extend between the flange top surface 19 of the first flange portion 13 and the flange top surface 20 of the second flange portion 14, and to fill the portion of the wire 16 located on the side of the core top surface 30 of the core portion 12. The resin-coated component 35 is made of resin, preferably containing ferrite powder or metal magnetic powder. As the resin, an ultraviolet curing resin is advantageously used. In addition, Figure 1 In other drawings, illustration of the resin-coated member is omitted.

[0054] The wire 16 wound around the winding core 12 forms three multilayer winding parts M1, M2 and M3, and the three multilayer winding parts M1, M2 and M3 sandwich the rewinding parts R1, R2 and R3 between the lower layer side and the upper layer side respectively (refer to Figure 3 The three multi-layer winding parts M1, M2 and M3 are arranged along the axial direction of the winding core 12.

[0055] In this embodiment, the multilayer winding portions M1, M2 and M3 each include a first layer which is the layer closest to the peripheral surface of the winding core 12 and a second layer wound around the first layer. The second layer is embedded in a recess formed between adjacent turns of the wire 16 forming the first layer.

[0056] The rewinding portions R1, R2, and R3 are located at positions covering the outer peripheral surface of the winding core portion 12 except for the winding core top surface 30. Figure 3 As can be seen from the diagram of the winding parts R1 , R2 , and R3 , the winding parts R1 , R2 , and R3 are located at positions covering the core bottom surface 29 of the outer peripheral surface of the winding core 12 .

[0057] Next, the main reference Figures 4 to 12 as well as Fig.13 , the details of the winding state of the wire 16 are described. Figures 4 to 12 is with Figure 3 The corresponding figure shows the drum core 15 from the bottom side. While the wire 16 is being spirally wound around the winding core 12, there is a process where the wire 16 is guided from a position covering the winding core bottom surface 29 to a position covering the first winding core side surface 31. Fig.13 The state of the wire 16 on the side surface 31 of the first winding core during such winding is shown in cross section. Fig.13 In FIG. 1 , the numbers marked in the cross section of the wire 16 conveniently indicate the number of turns counted from the first flange portion 13 side.

[0058] Refer to Figures 4 to 12 , the winding state of the wire 16 can be understood.

[0059] First, if Figure 4 As shown, the wire 16 is spirally wound around the winding core 12 from the first flange 13 side toward the second flange 14, for example, 5 turns, to form a first layer. A portion of the first layer wound here is the first layer in the first multi-layer winding portion M1. The state before this is equivalent to Fig.13 The state shown in (1).

[0060] Then, similarly Figure 4 As shown in FIG. 1 , the rewinding portion R1 is formed by the wound wire 16, so the front end F1 of the wire 16 faces the return direction. This state is equivalent to Fig.13 The state shown in (2). Fig.13 In (2), the sixth turn of the wire 16 is shown in a suspended state.

[0061] Then, if Figure 5 As shown, after the wire 16 forms the rewinding portion R1, the wire 16 is then wound to form the second layer in the first multi-layer winding portion M1. At this time, the front end F2 of the wire 16 climbs onto the rewinding portion R1.

[0062] If the winding of the wire 16 is changed from Figure 5 If the state shown in the figure is further advanced, Fig.13 As shown in (3), the sixth turn of the wire 16 is positioned so as to be embedded in the recess formed between the third turn and the fourth turn of the wire 16 forming the first layer, and the second layer on the outer peripheral side of the first layer begins to be formed.

[0063] Then, if Figure 6 As shown, the wire 16 is wound to form the second layer. Figure 6 In FIG. 1 , the front end of the wire 16 is indicated by “F3”.

[0064] If the winding of the wire 16 is changed from Figure 6 If the state shown in the figure is further advanced, Fig.13 As shown in (4), the seventh turn of the wire 16 is brought to a position opposite to the fourth turn and the fifth turn of the wire 16 forming the first layer.

[0065] Then, if Fig.13 As shown in (5), the seventh turn of the wire 16 is positioned to be embedded in the recess formed between the fourth turn and the fifth turn of the wire 16 forming the first layer and forms the second layer.

[0066] Then, if Figure 7 As shown, after the wire 16 is wound in the second layer for more than 2 turns (2 turns in this embodiment), it moves from the second layer to the first layer. As can be seen from the position of the front end F4 of the wire 16 shown in the figure, it is wound again to form the first layer. This state is equivalent to Fig.13 The state shown in (6). Fig.13As shown in (6), the eighth turn of the wire 16 is positioned to form the first layer.

[0067] As mentioned above Figure 6 as well as Figure 7 As shown, in this embodiment, the running direction of the wire 16 wound helically in the second layer in the axial direction of the winding core 12 is the same as the running direction of the wire 16 wound helically in the first layer in the axial direction.

[0068] Later, with reference Figures 4 to 7 Substantially the same steps as described are repeated a predetermined number of times.

[0069] If we simply explain, Figure 8 As shown, after the wire 16 is wound by a predetermined number of turns in the first layer, a rewinding portion R2 is formed by the wire 16 , so that the front end F5 of the wire 16 faces the return direction.

[0070] Then, if Fig. 9 As shown, after the wire 16 forms the rewinding portion R2, the wire 16 is then wound to form the second layer in the second multi-layer winding portion M2. At this time, the front end F6 of the wire 16 climbs onto the rewinding portion R2.

[0071] Then, if Fig.10 As shown, the wire 16 is wound to further form a second layer in the second multi-layer winding portion M2. Fig.10 In FIG. 1 , the front end of the wire 16 is indicated by “F7”.

[0072] Then, if Fig.11 As shown, after the wire 16 is wound more than 2 turns (2 turns in this embodiment) in the second layer, it moves from the second layer to the first layer. As can be seen from the position of the front end F8 of the wire 16 shown in the figure, it is wound again to form the first layer.

[0073] Then, implementation and reference Figures 4 to 7 or Figures 8 to 11 The above-mentioned steps are substantially the same as those described above, and finally, Fig.12 The status shown. Fig.12 In the state shown, the ends of the wire 16 are connected to the first terminal electrode 33 and the second terminal electrode 34 by, for example, thermocompression bonding. After the connection, the remaining portion of the end of the wire 16 is cut off and removed to form Figure 3 The status shown, setting Figure 1 The resin-coated member 35 is shown.

[0074] exist Figure 3In the embodiment, the wire 16 forms three multilayer winding portions M1, M2, and M3 which are wound in two layers with the rewind portions R1, R2, and R3 sandwiched between the first layer side and the second layer side.

[0075] The rewinding portions R1, R2, and R3 are located at the positions of the surfaces other than the core top surface 30 in the outer peripheral surface of the core portion 12, preferably at the positions covering the core bottom surface 29, thereby simplifying the winding structure of the wire 16 on the core top surface 30. Therefore, it is possible to suppress the stress concentration in the resin coating member 35 provided to cover the core top surface 30. In addition, it is possible to suppress the height of the wire 16 on the core top surface 30 in the wound state.

[0076] In addition, the three multilayer winding parts M1, M2 and M3 are distributed at multiple locations in the axial direction of the winding core 12, and with respect to the turns of the wire 16 constituting the first layer, which is the layer closest to the peripheral surface of the winding core 12, among the multilayer winding parts M1, M2 and M3, the adjacent turns of the wire 16 located between the adjacent parts of the multilayer winding parts M1, M2 and M3 are in contact with each other, or only a gap less than the radius of the wire 16 is formed. In addition, the radius of the wire 16 is, for example, the radius of the wire 16 including the central conductor composed of a copper wire and the insulating coating composed of a resin.

[0077] Therefore, it is possible to suppress a large increase in the volume of the resin coating member 35. In addition, the rewinding portions R1, R2, and R3 in the multi-layer winding portions M1, M2, and M3 are located at positions covering the core bottom surface 29, so that the unevenness of the thickness of the resin coating member 35 can be reduced. As can be seen from this, cracks can be less likely to occur in the resin coating member 35.

[0078] In particular, in this embodiment, not only the adjacent turns of the wire 16 located between the adjacent parts of the plurality of multilayer winding portions M1, M2, and M3, but also the adjacent turns of the wire 16 forming the first layer, except for the turns located at both ends in the axial direction of the winding core 12, are in contact with each other or form only a gap less than the radius of the wire 16. The turns located at both ends in the axial direction of the winding core 12 are guided so that the wire 16 is connected to the terminal electrodes 33 and 34, so there is a high possibility that a gap exceeding the radius of the wire 16 is formed. In addition, including the turns located at both ends in the axial direction of the winding core 12, it is not prevented that all of the adjacent turns of the wire 16 forming the first layer are in contact with each other or only a gap less than the radius of the wire 16 is formed.

[0079] In addition, in this embodiment, in each of the multilayer winding parts M1, M2 and M3, the number of turns of the wire 16 forming the second layer is 2 or more. In this way, by setting the number of turns of the wire 16 forming the second layer to 2 or more, when the wire 16 moves from the second layer to the first layer, it is not easy to generate a gap between the turns of the wire 16 previously located in the first layer and the turns of the wire 16 newly moved to the first layer. In addition, by forming the wire 16 of the second layer, it is possible to avoid a form that protrudes relatively sharply from the outer peripheral surface of the contour of the wound wire 16. Therefore, it is possible to suppress the concentration of local stress in the resin-coated component 35, and as a result, cracks in the resin-coated component 35 are not easy to generate.

[0080] In addition, from Figure 1 , Figure 2 as well as Figure 3 As can be seen from the state shown in the figure, in this embodiment, the wire 16 wound around the winding core 12 has a relatively neat shape, especially a substantially symmetrical shape with respect to the vertical direction in each figure. This also helps to suppress cracks in the resin coating member 35.

[0081] Fig.14 It is used to illustrate other embodiments of the present invention. Fig.13 The corresponding figure of (6). Fig.14 , it can be seen from the numbers indicated in the cross section of the wire 16 that the running direction of the wire 16 wound into a spiral shape in the second layer in the axial direction of the winding core 12 is opposite to the running direction of the wire 16 wound into a spiral shape in the first layer in the axial direction of the winding core 12. Therefore, it can be seen that the running direction of the wire 16 in the second layer in the axial direction of the winding core 12 can also be arbitrary.

[0082] Although the above description has been made in connection with the illustrated embodiment, various other modifications are possible within the scope of the present invention.

[0083] For example, the number of multilayer winding portions distributed in the axial direction of the winding core is not particularly limited as long as it is two or more.

[0084] In addition, the number of turns and layers of the wire in the multi-layer winding portion can be arbitrarily changed according to the necessary design. In addition, the number of turns and layers of the wire in each multi-layer winding portion can also be different for each multi-layer winding portion.

[0085] Furthermore, between different embodiments of the present invention, parts of the structures may be replaced or combined.

[0086] The present invention includes the following embodiments.

[0087] <1>

[0088] An inductor component, comprising:

[0089] A drum-shaped core having a winding core portion and a first flange portion and a second flange portion respectively provided at opposite ends of the winding core portion in the axial direction;

[0090] A wire having a circular cross section is wound around the winding core; and

[0091] The first terminal electrode and the second terminal electrode are respectively provided on the first flange portion and the second flange portion, and are respectively connected to the ends of the wire rod.

[0092] The core portion includes an outer peripheral surface including at least a core bottom surface facing the mounting substrate side and a core top surface facing in a direction opposite to the core bottom surface.

[0093] The first flange portion and the second flange portion include an outer peripheral surface, the outer peripheral surface having at least a flange bottom surface facing the mounting substrate side and a flange top surface facing the opposite direction to the flange bottom surface.

[0094] The first terminal electrode and the second terminal electrode are provided on at least the flange bottom surfaces of the first flange portion and the second flange portion, respectively.

[0095] A resin coating member is further provided, the resin coating member being arranged to extend between the flange top surface of the first flange portion and the flange top surface of the second flange portion and to fill a portion of the wire material located on the side of the core top surface of the core portion,

[0096] The wire material forms a multi-layer winding portion, which is wound into a plurality of layers with a rewinding portion sandwiched between a lower layer side and an upper layer side.

[0097] The rewinding portion is located at a position covering a surface of the outer peripheral surface of the winding core portion other than the top surface of the winding core.

[0098] The multi-layer winding parts are distributed at a plurality of locations in the axial direction of the winding core.

[0099] Regarding the turns of the wire rod of the first layer, which is a layer closest to the peripheral surface of the winding core portion, among the multi-layer winding portions, adjacent turns of the wire rod between adjacent multi-layer winding portions are in contact with each other or only form a gap less than the radius of the wire rod.

[0100] <2>

[0101] The inductor component according to <1>, wherein:

[0102] Adjacent turns of the wire rod forming the first layer are in contact with each other or form a gap having a radius less than or equal to that of the wire rod, except for turns located at both ends of the winding core in the axial direction.

[0103] <3>

[0104] The inductor component according to <1> or <2>, wherein:

[0105] The rewinding portion is located at a position covering a bottom surface of the winding core in the outer peripheral surface of the winding core portion.

[0106] <4>

[0107] The inductor component according to any one of <1> to <3>, wherein:

[0108] The multilayer wound portion includes the first layer and a second layer wound around the outer circumference of the first layer.

[0109] <5>

[0110] The inductor component according to <4>, wherein:

[0111] In each of the multi-layered winding portions, the number of turns of the wire material forming the second layer is 2 or more.

[0112] <6>

[0113] The inductor component according to <5>, wherein:

[0114] The running direction of the wire material helically wound in the second layer in the axial direction is the same as the running direction of the wire material helically wound in the first layer in the axial direction.

[0115] <7>

[0116] The inductor component according to <5>, wherein:

[0117] The running direction of the wire material helically wound in the second layer in the axial direction is opposite to the running direction of the wire material helically wound in the first layer in the axial direction.

Claims

1. An inductor component, wherein: have: A drum-shaped core having a winding core portion, a first flange portion, and a second flange portion, wherein the first flange portion and the second flange portion are respectively provided at opposite ends of the winding core portion in the axial direction; A wire having a circular cross section is wound around the winding core; and The first terminal electrode and the second terminal electrode are respectively provided on the first flange portion and the second flange portion, and are respectively connected to the ends of the wire. The core portion includes an outer peripheral surface including at least a core bottom surface facing the mounting substrate side and a core top surface facing in a direction opposite to the core bottom surface. The first flange portion and the second flange portion include an outer peripheral surface, the outer peripheral surface having at least a flange bottom surface facing the mounting substrate side and a flange top surface facing the opposite direction to the flange bottom surface. The first terminal electrode and the second terminal electrode are respectively provided on at least the flange bottom surfaces of the first flange portion and the second flange portion. A resin coating member is further provided, the resin coating member being arranged to extend between the flange top surface of the first flange portion and the flange top surface of the second flange portion and to fill a portion of the wire material located on the core top surface side of the core portion, The wire material forms a multi-layer winding portion, which is wound into a plurality of layers with a rewinding portion sandwiched between a lower layer side and an upper layer side, The rewinding portion is located at a position covering a surface of the outer peripheral surface of the winding core portion other than the top surface of the winding core, The multi-layer winding parts are distributed at a plurality of locations in the axial direction of the winding core, Regarding the turns of the wire that form the first layer, which is the layer closest to the peripheral surface of the winding core portion, among the multi-layer winding portions, adjacent turns of the wire between adjacent multi-layer winding portions are in contact with each other or only form a gap below the radius of the wire.

2. The inductor component according to claim 1, wherein: Adjacent turns of the wire rod forming the first layer are in contact with each other or form a gap having a size smaller than the radius of the wire rod, except for turns located at both ends of the winding core in the axial direction.

3. The inductor component according to claim 1 or 2, wherein: The rewinding portion is located at a position covering the bottom surface of the winding core in the outer peripheral surface of the winding core portion.

4. The inductor component according to any one of claims 1 to 3, wherein: The multilayer wound portion includes the first layer and a second layer wound on an outer peripheral side of the first layer.

5. The inductor component according to claim 4, wherein: In each of the multi-layer winding sections, the number of turns of the wire material forming the second layer is 2 or more.

6. The inductor component according to claim 5, wherein: The running direction of the wire material helically wound in the second layer in the axial direction is the same as the running direction of the wire material helically wound in the first layer in the axial direction.

7. The inductor component according to claim 5, wherein: The running direction of the wire material helically wound in the second layer in the axial direction is opposite to the running direction of the wire material helically wound in the first layer in the axial direction.

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