Coil parts

Abstract

To provide a coil component having a structure capable of easily achieving a desired positional relationship between a magnetic core and a bobbin part.SOLUTION: A coil component 100 includes a bobbin portion 30 having an insertion hole 36, a magnetic core 10 having an insertion portion 15 inserted into the insertion hole 36 and an outer arrangement portion arranged outside the bobbin portion 30, a coil 70 wound around the bobbin portion 30, and a cover member 80 covering the upper portion of the bobbin portion 30, and the cover member 80 has a positioning protrusion 86 for positioning the magnetic core 10, and the positioning protrusion 86 is arranged along the outer surface of the outer portion and restricts the outer portion from moving away from the bobbin portion 30 in the axial direction of the insertion hole 36, or is arranged between the inner surface of the outer portion and the bobbin portion 30 and restricts the outer portion from approaching the bobbin portion 30 in the axial direction of the insertion hole 36.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a coil component. [Background technology]

[0002] An example of a coil component is described in Patent Document 1. The coil component of Patent Document 1 is configured to include a bobbin portion (referred to as a bobbin in the document), a coil wound around the bobbin portion, and a magnetic core (referred to as a core portion in the document) inserted into the bobbin portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2017-212355 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the investigations of the present inventors, the structure of the coil component of Patent Document 1 has room for improvement in terms of achieving a desired positional relationship between the bobbin portion and the magnetic core.

[0005] The present invention has been made in view of the above-mentioned problems, and provides a coil component having a structure that makes it possible to easily achieve a desired positional relationship between a bobbin portion and a magnetic core. [Means for solving the problem]

[0006] According to the present invention, a bobbin portion having an insertion hole; a magnetic core having an insertion portion inserted into the insertion hole and an outer portion disposed outside the bobbin portion; a coil wound around the bobbin portion; a cover member covering an upper portion of the bobbin portion; Equipped with the bobbin portion has a first side surface disposed on one side in the axial direction of the insertion hole and a second side surface disposed on the other side opposite to the one side in the axial direction, the cover member has a positioning protrusion that positions the magnetic core, The positioning protrusion is disposed along an outer surface of the outer placement portion and prevents the outer placement portion from moving away from the bobbin portion in the axial direction of the insertion hole. Teo the law of nature, the magnetic core includes a first magnetic core and a second magnetic core that are arranged opposite to each other and fixed to each other, At least one of the first magnetic core and the second magnetic core has the insertion portion, Both the first magnetic core and the second magnetic core have the outer disposed portion, a first outer portion that is the outer portion of the first magnetic core is disposed on the one side in the axial direction, a second outer portion that is the outer portion of the second magnetic core is disposed on the other side in the axial direction, the positioning protrusion is selectively disposed on the one side of the one side and the other side in the axial direction, the positioning protrusion presses the outer surface of the first outer arrangement portion in a direction in which the first outer arrangement portion approaches the first side surface in the axial direction, a surface of the first outer portion facing the second outer portion is in contact with the first side surface, The coil component has a gap formed between the second side surface and a surface of the second outer portion facing the first outer portion. [Effects of the Invention]

[0007] According to the present invention, a desired positional relationship between the bobbin portion and the magnetic core can be easily achieved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a coil component according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the coil component according to the embodiment. [Figure 3] FIG. 2 is a front view of the coil component according to the embodiment. [Figure 4] FIG. 2 is a plan view of the coil component according to the embodiment. [Figure 5] FIG. 2 is a side view of the coil component according to the embodiment. [Figure 6] FIG. 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 7] FIG. 5 is a cross-sectional view taken along line BB in FIG. 4. [Figure 8] 8(a), 8(b), and 8(c) show the cover member in the embodiment, where FIG. 8(a) is a perspective view, FIG. 8(b) is a front view, and FIG. 8(c) is a bottom view. [Figure 9] FIG. 10 is a perspective view of a coil component according to a first modified example of the embodiment. [Figure 10] FIG. 10 is a side cross-sectional view of a coil component according to a first modified example of the embodiment. [Figure 11] Figures 11(a), 11(b), and 11(c) show a cover member in variant example 1 of the embodiment, where Figure 11(a) is a perspective view, Figure 11(b) is a front view, and Figure 11(c) is a bottom view. [Figure 12] FIG. 10 is a cross-sectional side view of a coil component according to a second modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In all the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted where appropriate.

[0010] As shown in any one of Figures 1 to 8(c), the coil device 100 of this embodiment includes a bobbin portion 30 having an insertion hole 36, an insertion portion 15 inserted into the insertion hole 36, a magnetic core 10 having an outer placement portion (in this embodiment, a base portion 12) placed outside the bobbin portion 30, a coil 70 wound around the bobbin portion 30, and a cover member 80 covering the top of the bobbin portion 30. The cover member 80 has a positioning protrusion 86 that positions the magnetic core 10. In the present embodiment, the positioning protrusion 86 is disposed along the outer surface of the outer disposed portion and prevents the outer disposed portion from moving away from the bobbin part 30 in the axial direction of the insertion hole 36.

[0011] As shown in FIG. 7, in this embodiment, the magnetic core 10 is biased by the positioning protrusion 86 to one side in the axial direction of the insertion hole 36 relative to the bobbin part 30. Here, "biased" means that the positioning protrusion 86 prevents the magnetic core 10 from moving in the other direction while biasing the magnetic core 10 toward one side in the axial direction of the insertion hole 36. More specifically, the positioning protrusion 86 is in a state in which, of the gap between one side of the magnetic core 10 and the bobbin portion 30 and the gap between the other side of the magnetic core 10 and the bobbin portion 30 in the axial direction of the insertion hole 36, the gap between the other side of the magnetic core 10 and the bobbin portion 30 is larger than the gap between one side of the magnetic core 10 and the bobbin portion 30. Furthermore, when the coil component 100 has, for example, a pair of magnetic cores 10, the outer placement portion here means the outer placement portion of the magnetic core 10 of the pair of magnetic cores 10 that is on the side on which the positioning protrusion portion 86 is located.

[0012] According to this embodiment, the outer portion is prevented from moving away from the bobbin portion 30 in the axial direction of the insertion hole 36. More specifically, the positioning protrusion 86 prevents the magnetic core 10 from moving in the other direction in the axial direction of the insertion hole 36 while the magnetic core 10 is biased in one direction. This makes it easy to achieve a desired positional relationship between the bobbin portion 30 and the magnetic core 10. More specifically, as described below, a gap 96 is formed between the inner surface of the magnetic core 10 and the bobbin portion 30, which allows the magnetic core 10 to expand or contract. This prevents stress from being applied to the magnetic core 10. Furthermore, since the positioning protrusions 86 can easily achieve a desired positional relationship between the bobbin part 30 and the magnetic core 10, the magnetic core 10 can be easily positioned relative to the bobbin part 30 without using a dedicated jig in the manufacturing process of the coil component 100. This improves the ease of manufacturing the coil component 100.

[0013] In the following description, the vertical direction is referred to as the Z direction. The bottom (lower side) is the side on which terminal portions 60 (FIG. 1, etc.) described below are arranged, i.e., the mounting surface side on which coil component 100 is mounted. However, the positional relationships of the various parts (particularly the vertical positional relationships) during the manufacture and use of coil component 100 are not limited to the positional relationships described in this specification. The axial direction of the insertion hole 36 extends in a direction perpendicular to the Z direction. The axial direction of the insertion hole 36 is referred to as the Y direction, and one side in the Y direction is referred to as the front (forward) and the other side is referred to as the rear (rear). Moreover, the direction perpendicular to both the Y direction and the Z direction is referred to as the X direction, and one side of the X direction is referred to as the right (rightward), and the other is referred to as the left (leftward). These directions are indicated in each figure. Furthermore, in the Y direction, the side where the center position in the axial direction of the insertion hole 36 is located is referred to as the inner side (inside), and the side opposite the inner side is referred to as the outer side (outside). Similarly, in the X direction, the side where the center position in the left-right direction of the insertion hole 36 is located is referred to as the inner side (inside), and the side opposite the inner side is referred to as the outer side (outside). Moreover, the direction perpendicular to the Z direction is referred to as horizontal (horizontal direction), and the direction along the Z direction is referred to as vertical (vertical direction).

[0014] Here, in this embodiment, the positioning protrusion 86 presses the outer surface of the outer-arrangement portion (in this embodiment, the outer surface 12b of the base of the first magnetic core 11a) in the direction in which the outer-arrangement portion approaches the bobbin portion 30 in the axial direction of the insertion hole 36. As a result, the positioning protrusion 86 can prevent the magnetic core 10 from being displaced relative to the bobbin portion 30 in the axial direction of the insertion hole 36 while biasing the magnetic core 10 toward the bobbin portion 30.

[0015] The magnetic core 10 includes, for example, a first magnetic core 11a and a second magnetic core 11b that are arranged opposite each other and are combined with each other, and at least one of the first magnetic core 11a and the second magnetic core 11b has an insertion portion 15, and both the first magnetic core 11a and the second magnetic core 11b have outer arrangement portions. In this embodiment, the magnetic core 10 includes, for example, a pair of front and rear core members, that is, a first magnetic core 11a disposed on the front side and a second magnetic core 11b disposed on the rear side. More specifically, each of the first magnetic core 11a and the second magnetic core 11b is, for example, a so-called E-core, and has an E-shaped planar shape (see FIG. 4). The first magnetic core 11a includes a base 12 extending in the left-right direction, a pair of outer legs 13 protruding rearward from both ends of the base 12, and an insertion portion 15 protruding rearward from the middle of the base 12. The protruding directions of the outer legs 13 and the insertion portion 15 from the base 12 are the same as the axial direction of the insertion hole 36. The base 12 is formed, for example, in the shape of a rectangular prism that is elongated in the left-right direction and has a cross section perpendicular to the axial direction. Two of the four faces of the base 12 arranged around the axis are horizontal upper and lower faces, respectively, and one of the remaining two faces (hereinafter referred to as the inner face 12a) faces the bobbin part 30, and the other (hereinafter referred to as the outer face 12b) faces the opposite side of the bobbin part 30. In this embodiment, the inner face 12a of the base 12 forms the inner face of the first magnetic core 11a, and the outer face 12d of the base 12 forms the outer face of the first magnetic core 11a. Each of the outer legs 13 and the insertion section 15 is elongated in the front-to-rear direction and has a rectangular cross section perpendicular to the axial direction. Two of the four faces of the base 12 arranged around the axis are horizontal upper and lower faces, and one of the remaining two faces faces right and the other faces left. The base 12, the outer legs 13, and the insertion portions 15 are, for example, set to have the same vertical dimensions. In the first magnetic core 11a, the upper surface of the base 12 and the upper surfaces of the outer legs 13 and insertion portions 15 are arranged flush with each other. That is, the entire upper surface of the first magnetic core 11a is formed flat and arranged horizontally. Similarly, in the first magnetic core 11a, the lower surface of the base 12 and the lower surfaces of the outer legs 13 and insertion portions 15 are arranged flush with each other. That is, the entire lower surface of the first magnetic core 11a is formed flat and arranged horizontally.

[0016] In this embodiment, both the first magnetic core 11a and the second magnetic core 11b have insertion portions 15, as shown in FIG. More specifically, the second magnetic core 11b is formed in the same shape as the first magnetic core 11a, for example. That is, the second magnetic core 11b includes a base 12, a pair of outer legs 13, and an insertion portion 15. The base 12 has an upper surface, a lower surface, an inner surface 12a, and an outer surface 12b. The first magnetic core 11a is disposed symmetrically in the front-rear direction.

[0017] The tip end surfaces of the outer leg portions 13 of each of the first magnetic core 11a and the second magnetic core 11b in the protruding direction are formed flat and are vertical surfaces that are perpendicular to the axial direction of the insertion hole . Similarly, the tip end surfaces of the first magnetic core 11a and the second magnetic core 11b in the protruding direction of the insertion portion 15 are formed flat and are vertical surfaces that are perpendicular to the axial direction of the insertion hole . 3, the inner surface 12a and the outer surface 12b of the base 12 are also formed flat and are vertical surfaces perpendicular to the axial direction of the coil 70. The inner surface of the first magnetic core 11a and the inner surface of the second magnetic core 11b face each other, and the outer surface of the first magnetic core 11a and the outer surface of the second magnetic core 11b face in opposite directions.

[0018] 2, the coil device 100 further includes a main body member 20 having a bobbin portion 30 and a terminal holding portion 50, and a plurality of terminal portions 60 held by the terminal holding portion 50. A winding 71 constituting the coil 70 is wound around the bobbin portion 30.

[0019] The bobbin portion 30 includes, for example, a cylindrical portion 31 and a pair of flange portions 40 provided at both ends of the cylindrical portion 31 in the axial direction. The cylindrical portion 31 is formed in a square cylindrical shape with an insertion hole 36 passing through in the axial direction. As shown in FIG. 2, the cylindrical portion 31 is configured to include an upper wall portion and a lower wall portion that are each horizontally disposed, and a right wall portion and a left wall portion that are each vertically disposed. For example, the internal space of the insertion hole 36 is shaped like a rectangular pillar. The bottom surface (inner peripheral bottom surface) and the top surface of the inner peripheral surface of the insertion hole 36 are horizontal planes, and the left side surface and the right side surface of the inner peripheral surface of the insertion hole 36 are vertical planes.

[0020] As shown in Figures 2, 3 and 4, the bobbin portion 30 has, for example, a pair of flange portions 40, namely, a first flange portion 41 located on the front side and a second flange portion 42 located on the rear side. The first flange 41 and the second flange 42 each protrude from both ends of the cylindrical portion 31 toward the outer periphery of the cylindrical portion 31, for example. More specifically, each of the first flange portion 41 and the second flange portion 42 is formed in the shape of a flat plate that is perpendicular to the axial direction of the cylindrical portion 31, for example. The front-to-rear dimension (thickness dimension) of the first flange 41 is equal to the front-to-rear dimension (thickness dimension) of the second flange 42. The left-to-right dimension of the first flange 41 is equal to the left-to-right dimension of the second flange 42, and the up-to-down dimension of the first flange 41 is equal to the up-to-down dimension of the second flange 42. In addition, the right end face of the first flange portion 41 and the right end face of the second flange portion 42 are arranged flush with each other, and the left end face of the first flange portion 41 and the left end face of the second flange portion 42 are arranged flush with each other.

[0021] As shown in Figures 2, 3 and 4, the main body member 20 has a terminal holding portion 50, which includes a first terminal holding portion 52 arranged on the front side and a second terminal holding portion 55 arranged on the rear side. Each of the first terminal holding portion 52 and the second terminal holding portion 55 is formed, for example, in the shape of a flattened rectangular pillar that is elongated in the left-right direction and has a front-to-back dimension that is smaller than its top-to-bottom dimension. The first terminal holding portion 52 protrudes forward and in the left-right direction from the lower edge of the first flange portion 41. The second terminal holding portion 55 protrudes backward and in the left-right direction from the lower edge of the second flange portion . In this embodiment, the front-to-rear dimension of the first terminal holding portion 52 is equal to the front-to-rear dimension of the second terminal holding portion 55. The up-down dimension of the first terminal holding portion 52 is equal to that of the second terminal holding portion 55. The left-to-right dimension of the first terminal holding portion 52 is equal to the left-to-right dimension of the second terminal holding portion 55. In addition, the height position of the lower end surface of the protruding portion 59 is equal to the height position of the lower end surface of the first terminal holding portion 52. However, the dimensional relationship between the first terminal holding portion 52 and the second terminal holding portion 55 is not particularly limited, and the first terminal holding portion 52 and the second terminal holding portion 55 may have different dimensions. The upper surfaces of the first terminal holding portion 52 and the second terminal holding portion 55 are each formed flat and are arranged horizontally. Each of the first terminal holding portion 52 and the second terminal holding portion 55 holds a plurality of terminal portions 60, which will be described later.

[0022] As shown in FIGS. 4 and 5, in this embodiment, the coil device 100 includes a plurality of (for example, eight) terminal portions 60 electrically connected to the coil 70. As an example, of the eight terminal portions 60, four terminal portions 60 (hereinafter referred to as first terminal portions 61) are held by the first terminal holding portion 52, and the remaining four terminal portions 60 (hereinafter referred to as second terminal portions 62) are held by the second terminal holding portion 55. The first terminal portions 61 are arranged side by side in the left-right direction in the first terminal holding portion 52. Similarly, the second terminal portions 62 are arranged side by side in the left-right direction in the second terminal holding portion 55.

[0023] Each terminal portion 60 is formed by bending, for example, a long rod-shaped (or plate-shaped) metal member. 2 and 3, each first terminal portion 61 has an upper portion (not shown) embedded in the first terminal holding portion 52 and a lower portion exposed to the outside from the first terminal holding portion 52. The exposed lower portion is an external terminal 65 to be externally connected when the coil device 100 is mounted. More specifically, the first terminal portion 61 is bent at its longitudinal middle portion. The upper portion of the first terminal portion 61 extends vertically, and the lower portion of the first terminal portion 61 extends longitudinally. The external terminals 65 of each first terminal portion 61 protrude downward from the bottom surface of the first terminal holding portion 52 and further extend forward.

[0024] For example, each second terminal portion 62 is formed in a shape symmetrical from front to back to each first terminal portion 61. Therefore, each third terminal portion 63 has an upper portion (not shown) embedded in the second terminal holding portion 55 and an external terminal 65 (lower portion) exposed to the outside from each first terminal holding portion 52.

[0025] The length dimensions in the front-rear direction of the external terminals 65 of each terminal portion 60 are set to be, for example, the same length dimensions as each other. The thickness of the plate-shaped metal members that form the terminal portions 60 is set to be the same as each other.

[0026] As shown in FIGS. 2 and 4, the coil device 100 includes, for example, a first coil and a second coil as the coil 70. The first coil and the second coil are each formed of a winding 71. Each winding 71 of the coil 70 is wound around the tubular portion 31 of the bobbin portion 30. The winding 71 wound around the tubular portion 31 forms a winding portion 72 (see FIG. 2). Both ends of each winding 71 are electrically connected to the corresponding terminal portion 60. As an example, both ends of each winding 71 are pulled out from the winding portion 72 and wound around the corresponding terminal portion 60, thereby electrically connecting to the terminal portion 60. Note that the portion of the winding 71 pulled out from the winding portion 72 and the portion where the winding 71 is wound around the terminal portion 60 are not shown in the figure. The portion where each winding 71 is wound may be a portion of the terminal portion 60 that protrudes from the terminal holding portion 50 (for example, a portion that protrudes from the terminal holding portion 50 separate from the L-shaped portion including the external terminal 65, or a portion of the terminal portion 60 between the portion embedded in the bobbin portion 30 and the external terminal 65), or may be a portion of the terminal portion 60 that is embedded inside the bobbin portion 30. In each figure, the end of the winding 71 wound around the terminal portion 60 and the portion extending from the winding portion 72 toward the terminal portion 60 are omitted from the illustration.

[0027] 1, 2, 6, etc., the cover member 80 includes, for example, a top surface portion 81 that covers the upper side of the bobbin portion 30. More specifically, the cover member 80 includes a first side wall portion 82a and a second side wall portion 82b that extend downward from a peripheral edge portion 81a of the top surface portion 81. The top surface 81 is formed, for example, in the shape of a flat plate and is disposed horizontally. As shown in Fig. 4, the top surface 81 has, for example, a substantially rectangular planar shape. The rear right portion of the top surface 81 has a cutout portion 81b where a corner is partially removed. The cutout portion 81b makes it easy to determine the orientation of the cover member 80. By providing the cover member 80 with the top surface portion 81, the top surface portion 81 can be attracted by a mounter when mounting the coil component 100 on a substrate, facilitating the work of mounting the coil component 100 on a substrate. Note that the top surface portion 81 does not have to be formed flat, for example. Each of the first side wall portion 82a and the second side wall portion 82b is formed in a flat plate shape and is disposed vertically. The first side wall portion 82a extends downward, for example, from the lower surface of the front end portion of the top surface portion 81, and the second side wall portion 82b extends downward, for example, from the lower surface of the rear end portion of the top surface portion 81. As shown in Fig. 5, the first side wall portion 82a and the second side wall portion 82b face each other in the left-right direction, for example. The right side surface of the first side wall portion 82a is flush with the right side surface of the top surface portion 81, and the left side surface of the second side wall portion 82b is flush with the left side surface of the top surface portion 81.

[0028] The first magnetic core 11a and the second magnetic core 11b are each integrally formed from a magnetic material. The main body member 20 (bobbin portion 30 and terminal holding portion 50) is, for example, entirely integrally molded from an insulating material such as resin. The cover member 80 is, for example, integrally molded in its entirety from an insulating material such as resin.

[0029] In the present embodiment, the cover member 80 is attached to the bobbin portion 30 so as to cover, for example, the upper end portion of the bobbin portion 30. More specifically, as shown in Figures 3 and 5, the top surface portion 81 covers the upper side of the bobbin portion 30, the first side wall portion 82a covers the right side of the upper end portion of the bobbin portion 30, and the second side wall portion 82b covers the left side of the upper end portion of the bobbin portion 30.

[0030] 6, the inner surface (lower surface) of top surface portion 81 and the upper end surface of first flange portion 41 and the upper end surface of second flange portion 42 are in surface contact with each other, for example. However, the inner surface of top surface portion 81 and the upper end surface of first flange portion 41 and the upper end surface of second flange portion 42 may also be opposed to each other in close proximity. 4, the inner surface of the first side wall portion 82a is preferably arranged parallel to and facing the right side surface of the first flange portion 41 and the right side surface of the second flange portion 42. The inner surface of the second side wall portion 82b is preferably arranged parallel to and facing the left side surface of the first flange portion 41 and the left side surface of the second flange portion 42.

[0031] The insertion portion 15 of the first magnetic core 11a is inserted into the insertion hole 36 of the bobbin part 30 through the front opening of the insertion hole 36 (see FIG. 6). Similarly, the insertion portion 15 of the second magnetic core 11b is inserted into the insertion hole 36 of the bobbin part 30 through the rear opening of the insertion hole 36. The tip surface of the insertion portion 15 of the first magnetic core 11a and the tip surface of the insertion portion 15 of the second magnetic core 11b are butted against each other inside the insertion hole 36. That is, the tip surface of the insertion portion 15 of the first magnetic core 11a and the tip surface of the insertion portion 15 of the second magnetic core 11b are in surface contact with each other. The first magnetic core 11a and the second magnetic core 11b form a closed magnetic circuit. As shown in Figure 6, a coil 70 is wound around the bobbin portion 30, and the insertion portion 15 is inserted into the bobbin portion 30, so that the coil 70 is wound around the magnetic core 10.

[0032] 3 and 4, the left and right outer legs 13 of the first magnetic core 11a are disposed outside the bobbin portion 30. The inner surface of the right outer leg 13 faces each of the right side surface of the first flange 41 and the right side surface of the second flange 42, and the inner surface of the left outer leg 13 faces each of the left side surface of the first flange 41 and the left side surface of the second flange 42. The base 12 of the first magnetic core 11a is disposed on the front side of the bobbin portion 30, and the inner surface 12a of the base 12 faces the front surface of the first flange 41. More specifically, the left and right outer legs 13 of the second magnetic core 11b are disposed outside the bobbin portion 30. The inner surface of the right outer leg 13 faces the right side surface of the first flange 41 and the right side surface of the second flange 42, respectively, and the inner surface of the left outer leg 13 faces the left side surface of the first flange 41 and the left side surface of the second flange 42, respectively. The base 12 of the second magnetic core 11b is disposed rearward of the bobbin portion 30, and the inner surface 12a of the base 12 faces the rear surface of the second flange 42. The tip surface of the right outer leg 13 of the first magnetic core 11a and the tip surface of the right outer leg 13 of the second magnetic core 11b are abutted against each other. That is, the tip surface of the right outer leg 13 of the first magnetic core 11a and the tip surface of the right outer leg 13 of the second magnetic core 11b are in surface contact with each other. Similarly, the tip surface of the left outer leg 13 of the first magnetic core 11a and the tip surface of the left outer leg 13 of the second magnetic core 11b are abutted against each other. The lower surface of the insertion portion 15 is disposed along the inner circumferential bottom surface of the insertion hole 36 .

[0033] In this embodiment, the tip surface of the right outer leg 13 of the first magnetic core 11a and the tip surface of the right outer leg 13 of the second magnetic core 11b are fixed to each other with a first adhesive 91 (see FIGS. 3 and 4). Similarly, the tip surface of the left outer leg 13 of the first magnetic core 11a and the tip surface of the left outer leg 13 of the second magnetic core 11b are fixed to each other with a first adhesive 91 (see FIGS. 4 and 5). The first adhesive 91 integrally connects the first magnetic core 11a and the second magnetic core 11b to each other and prevents misalignment between the first magnetic core 11a and the second magnetic core 11b. Furthermore, it is possible to prevent the magnetic core 10 from falling off the bobbin portion 30.

[0034] As shown in FIG. 3, the lower surfaces of the first magnetic core 11a and the second magnetic core 11b are arranged on the same plane. The base portion 12 of the first magnetic core 11a is disposed above the first terminal holding portion 52, and is disposed along the upper surface of the first terminal holding portion 52 (see FIGS. 1 and 4). The base 12 of the second magnetic core 11b is disposed above the second terminal holding portion 55 and is disposed along the upper surface of the second terminal holding portion 55 (see FIGS. 3 and 4). The lower surfaces of the first magnetic core 11a and the second magnetic core 11b and the upper surfaces of the terminal holding portion 50 (the first terminal holding portion 52 and the second terminal holding portion 55) may be in surface contact with each other or may face each other in close proximity.

[0035] As shown in Figures 3 and 7, in this embodiment, the positioning protrusion 86 presses the outer placement portion of the first magnetic core 11a toward the bobbin portion 30, and the surface of the outer placement portion of the first magnetic core 11a that faces the outer placement portion of the second magnetic core 11b (in this embodiment, the inner surface 12a of the base 12) is in contact with the bobbin portion 30, and a gap 96 is formed between the surface of the outer placement portion of the second magnetic core 11b that faces the outer placement portion of the first magnetic core 11a (in this embodiment, the inner surface 12a of the base 12 of the second magnetic core 11b) and the bobbin portion 30. As a result, even if the magnetic core 10 expands and contracts due to heating during use of the coil device 100, the gap 96 between the inner surface 12a of the second magnetic core 11b and the bobbin part 30 allows the magnetic core 10 to expand or contract. Therefore, stress applied to the magnetic core 10 can be suppressed. Furthermore, by maintaining a good positional relationship between the magnetic core 10 and the bobbin portion 30, the good positional relationship between the magnetic core 10 and the coil 70 is also maintained, thereby achieving more stable characteristics of the coil component 100.

[0036] More specifically, in this embodiment, the cover member 80 further has a downward extension portion 84 (see Figures 1 and 3, etc.) extending downward from the peripheral portion 81a of the top surface portion 81, and a positioning protrusion portion 86 is formed at the lower end portion of the downward extension portion 84. More specifically, as shown in Figures 8(a) and 8(c), the downward extension portion 84 has, for example, a main portion 85 extending downward from the underside of the front end portion of the peripheral portion 81a, and a positioning protrusion portion 86 extending downward from the lower end of the main portion 85. The main portion 85 is formed, for example, in the shape of a substantially rectangular parallelepiped that is long in the vertical direction. The rear end surface of the main portion 85 is located rearward of the rear end surface of the top surface portion 81, while the front end surface of the main portion 85 is located forward of the front end surface of the top surface portion 81. More specifically, a portion of the main portion 85 protrudes forward beyond the front end surface of the peripheral portion 81a, and this portion protrudes to a height position equivalent to the upper surface of the top surface portion 81 (the upper surface of this portion is located flush with the upper surface of the top surface portion 81). As shown in FIGS. 8(a), 8(b), and 8(c), the positioning protrusion 86 is, for example, a vertically long protruding piece having a front surface, a rear surface, and left and right end surfaces. In this embodiment, a portion of the lower surface of the main portion 85 is an area where the positioning protrusion 86 is not formed, and the lower end of the main portion 85 and the upper end of the positioning protrusion 86 form a step surface 84a. More specifically, the front surface of the positioning protrusion 86 is disposed flush with the front surface of the main portion 85. Meanwhile, the rear surface of the positioning protrusion 86 is disposed rearward of the rear surface of the main portion 85, and the step surface 84a is disposed across the upper end of the rear surface of the positioning protrusion 86 and the lower end of the rear surface of the downward extension portion 84. The step surface 84a is formed flat and disposed horizontally. The step surface 84a is in surface contact with the upper surface of the base portion 12 of the first magnetic core 11a. This makes it possible to suppress rattling of the first magnetic core 11a (and therefore the second magnetic core 11b) in the vertical direction. The right side surface of the positioning protrusion 86 is flush with the right side surface of the main portion 85 , and the left side surface of the positioning protrusion 86 is flush with the left side surface of the main portion 85 .

[0037] Also, as shown in Figure 6, the surface of the positioning protrusion 86 that faces the outer placement portion of the first magnetic core 11a (in this embodiment, the rear end surface of the positioning protrusion 86) has, for example, an inclined surface 86a that is inclined in a direction that approaches the outer placement portion upward. When the cover member 80 is attached to the bobbin portion 30, the positioning protrusion portion 86 and the main portion 85 are guided downward along the inclined surface 86a. More specifically, the rear surface of the positioning protrusion 86 includes, for example, an inclined surface 86a and a flat surface 86b that is formed flat and disposed vertically. The upper edge of the flat surface 86b is connected to, for example, the lower surface of the main portion 85, and the lower edge of the flat surface 86b is connected to the upper edge of the inclined surface 86a. The flat surface 86b is, for example, perpendicular to the front-rear direction. 6, in this embodiment, the flat surface 86b of the positioning protrusion 86 is in surface contact with the outer surface 12b of the base 12 of the first magnetic core 11a. In addition, the lower end surface of the positioning protrusion 86 is located below the upper surface of the first magnetic core 11a and above the lower surface of the first magnetic core 11a. The positioning protrusion 86 may be, for example, a spring piece that prevents the outer arrangement portion from moving away from the bobbin portion 30 in the axial direction of the insertion hole 36 by means of an elastic force (spring force).

[0038] As shown in Figures 3 and 7, the bobbin portion 30 has, for example, a pair of front and rear side surfaces, i.e., a first side surface 41a located on the front side and a second side surface 42a located on the rear side. In this embodiment, the positioning protrusion 86 presses the outer surface 12b of the base 12 of the first magnetic core 11a toward the first side surface 41a in the axial direction (front-rear direction) of the insertion hole 36, and the inner surface 12a of the base 12 of the first magnetic core 11a is in contact with the first side surface 41a. Also, a gap 96 is formed between the inner surface 12a of the base 12 of the second magnetic core 11b and the second side surface 42a. The first side surface 41a is, for example, the front surface of the first flange portion 41, and the second side surface 42a is, for example, the rear surface of the second flange portion 42. Each of the first side surface 41a and the second side surface 42a is formed flat and is perpendicular to the front-to-rear direction. The flat surface 86b of the positioning protrusion 86 faces the first side surface 41a in the front-rear direction, with the outer arrangement portion of the first magnetic core 11a sandwiched therebetween. The flat surface 86b is in surface contact with the outer surface 12b of the base portion 12 of the first magnetic core 11a. Furthermore, the first side surface 41a of the bobbin portion 30 is in surface or point contact with the inner surface 12a of the base portion 12 of the first magnetic core 11a. In this way, the base portion 12 of the first magnetic core 11a is sandwiched between the positioning protrusion 86 and the first side surface 41a in the axial direction (front-rear direction) of the insertion hole 36. This makes it possible to prevent the magnetic core 10 from being displaced relative to the bobbin portion 30 and the cover member 80 in the front-rear direction. In other words, the gap 96 between the inner surface 12a and the second side surface 42a of the second magnetic core 11b can be maintained well, so that the gap 96 can more reliably absorb stress between the magnetic core 10 and the bobbin portion 30.

[0039] Furthermore, in this embodiment, the cover member 80 has a second downward extending portion 87 extending downward from the peripheral edge portion 81a of the top surface portion 81, and the second downward extending portion 87 has an engaging claw 88. As shown in FIG. 7 , the engaging claw 88 engages with the bobbin portion 30. This allows the cover member 80 to be maintained in a good state attached to the bobbin portion 30. Furthermore, in the present embodiment, the magnetic core 10 is inserted into the bobbin portion 30 while being positioned relative to the bobbin portion 30 by the cover member 80. Therefore, by maintaining a good positional relationship between the bobbin portion 30 and the cover member 80, the positional relationship between the magnetic core 10 and the bobbin portion 30 can also be maintained in a good state, and the gap 96 between the inner surface 12a of the second magnetic core 11b and the bobbin portion 30 can be maintained in a good state. Furthermore, since the positional relationship between the magnetic core 10 and the coil 70 is also maintained in a good state, the coil device 100 can have more stable characteristics.

[0040] More specifically, the cover member 80 has a second downward extending portion 87a (see FIG. 7) that is arranged on the same side as the downward extending portion 84 with respect to the bobbin portion 30, and a second downward extending portion 87b (see FIG. 6) that is arranged on the opposite side of the bobbin portion 30 from the downward extending portion 84. In the present embodiment, the second downward extending portion 87a is arranged on the front side, and the second downward extending portion 87b is arranged on the rear side. 8(b) and 8(c), the second downward extending portion 87a extends downward from the front edge portion of the lower surface of the top surface portion 81. The second downward extending portion 87a engages with, for example, the first flange portion 41 of the bobbin portion 30. The second downward extension 87b extends downward from the rear edge of the lower surface of the top surface 81. The second downward extension 87a engages with the second flange 42 of the bobbin part 30, for example. With this configuration, both the front second downward extending portion 87a and the rear second downward extending portion 87b are engaged with the bobbin portion 30 by an engagement structure, so that it is possible to restrict the displacement of the cover member 80 relative to the bobbin portion 30 in the front-rear direction. Furthermore, it is also possible to restrict the displacement of the cover member 80 relative to the magnetic core 10 in the front-rear direction. Therefore, it is also possible to suppress the positional deviation of the positioning protrusion 86 relative to the first magnetic core 11a in the front-rear direction.

[0041] Also, as shown in Figures 8(a) and 8(c), the cover member 80 has a pair of second downward extension portions 87 (in this embodiment, the second downward extension portion 87a located on the front side) that sandwich the downward extension portion 84 therebetween. More specifically, the second downward extending portions 87a are formed, for example, in the left-right direction, on the right and left sides of the front edge of the top surface portion 81, with the downward extending portion 84 sandwiched therebetween. In other words, the downward extending portion 84 is disposed between the second downward extending portion 87a on the right side and the second downward extending portion 87a on the left side. In this way, by forming the two second downward extending portions 87a side by side in the left-right direction, it is possible to restrict the relative displacement of the cover member 80 around the Z axis with respect to the bobbin portion 30. Furthermore, it is also possible to restrict the relative displacement of each of the downward extending portions 84 around the Z axis with respect to the magnetic core 10, so that the state in which the positioning protrusion 86 presses the first magnetic core 11a against the bobbin portion 30 can be maintained in an optimal manner. Each of the pair of second downward extending portions 87a has, for example, a flat plate portion formed in a flat plate shape, and the plate surface of the flat plate portion faces the front-rear direction. The front end surface of the flat plate portion of each of the pair of second downward extending portions 87a is disposed, for example, flush with the front end surface of the top surface portion 81. As shown in Figures 7 and 8(c), each engagement claw 88 of the pair of second downward extension portions 87a protrudes, for example, from the rear end surface of the flat plate portion toward the bobbin portion 30 (rearward). The upper surface of the engagement claw 88 is formed flat and arranged horizontally. Meanwhile, a portion of the lower end of the engagement claw 88 is chamfered. Furthermore, the tip surface 88a (the tip in the protruding direction) of the engagement claw 88 is formed flat and arranged vertically. 8(a) and 8(c), the top surface 81 is formed with a pair of left and right first slit portions 89a that penetrate the top surface 81 in the up-down direction. Each of the pair of first slit portions 89a extends in a substantially straight line in the left-right direction. The right first slit portion 89a is adjacent to the flat plate portion of the right second downward extending portion 87a in the front-rear direction and is located rearward of the flat plate portion. Similarly, the left first slit portion 89a is adjacent to the flat plate portion of the left second downward extending portion 87a in the front-rear direction and is located rearward of the flat plate portion.

[0042] Furthermore, as shown in FIG. 8(c), in this embodiment, the cover member 80 has a pair of left and right second downward extending portions 87b (in this embodiment, the second downward extending portion 87b arranged on the rear side). This makes it possible to more reliably restrict the relative displacement of the cover member 80 with respect to the bobbin portion 30 around the Z axis. More specifically, each of the pair of second downward extending portions 87b is formed, for example, in a shape that is symmetrical in the front-to-rear direction to the pair of second downward extending portions 87a. That is, each of the pair of second downward extending portions 87b has a flat plate portion and an engaging claw 88 that protrudes forward from the front end surface of the flat plate portion. The rear end surface of the flat plate portion of each of the pair of second downward extending portions 87b is disposed flush with the rear end surface of the top surface portion 81. 8(a) and 8(c), the top surface 81 is formed with a second slit 89b that penetrates the top surface 81 in the up-down direction. The second slit 89b extends in a substantially straight line in the left-right direction. The second slit 89b is adjacent to the flat plate portions of the pair of second downward extending portions 87b in the front-rear direction and is located forward of the flat plate portions.

[0043] Here, as shown in Figures 2, 5, 6 and 7, the first side surface 41a (front surface of the first flange portion 41) is formed with a pair of left and right engaged portions 48 with which the second downward extension portion 87a engages, and a pair of left and right protrusion portions 46 connected to the engaged portions 48. The pair of left and right engaged portions 48 are formed, for example, in the left-right direction, at the front and rear portions of the first side surface 41a, respectively, on either side of the insertion hole 36. The pair of left and right engaged portions 48 are formed, for example, at the upper end portion of the first side surface 41a, and are arranged above the front opening of the insertion hole 36. Each engaged portion 48 protrudes forward from the first side surface 41 a, for example. More specifically, each engaged portion 48 includes a tapered portion that increases in protrusion downward in a tapered manner, and a flat portion that is formed flat and disposed vertically. The lower edge of each tapered portion is connected to the upper edge of the corresponding flat portion. The lower surface of the flat portion is, for example, flat and arranged horizontally. The front side surface of the flat portion is, for example, perpendicular to the axial direction (front-rear direction) of the insertion hole 36. Each of the pair of left and right protrusions 46 protrudes forward from the first side surface 41a. More specifically, as shown in Figures 3 and 5, each protrusion 46 extends in a substantially straight line in the up-down direction. The tip surface (the tip in the protruding direction) of each protrusion 46 is formed flat and is disposed vertically. As shown in FIG. 5, the rear end surface of the right protrusion 46 is connected to the right engaged portion 48, and the front end surface of the left protrusion 46 is connected to the left engaged portion 48.

[0044] 5, the engaging claws 88 of the second downward extending portions 87a engage with the respective engaged portions 48. When the cover member 80 is fitted onto the bobbin portion 30, the pair of second downward extending portions 87a are guided along the tapered portions of the corresponding engaged portions 48 toward the flat portions of the engaged portions 48. The protruding length (front-to-rear dimension) of the flat portion of the engaged portion 48 is set to be, for example, slightly smaller than the protruding length (front-to-rear dimension) of the engaging claw 88. In the up-down direction, the height position of the lower surface of the flat portion of the engaged portion 48 is set to be at a height position that is approximately the same as the height position of the upper surface of the engaging claw 88. The lower surface of the flat portion of the engaged portion 48 is in surface contact with the upper surface of the engaging claw 88. The tip surface 88a of the engaging claw 88 is in surface contact with the first side surface 41a. In addition, in the front-to-rear direction, the front end surface of the flat portion of the engaged portion 48 faces a part of the rear end surface of the flat plate portion of the second downward extending portion 87a. As shown in FIG. 3 , the protruding length (front-to-back dimension) of each protruding portion 46 is set to be greater than the protruding length of the flat portion of each engaged portion 48. The vertical dimension of each protruding portion 46 is set to be equal to the vertical dimension of each engaged portion 48. As shown in FIG. 5 , the left side surface of the right protruding portion 46 and the right side surface of the right second downward extending portion 87a face each other in the left-right direction. This prevents the right second downward extending portion 87a from moving to the right of the corresponding protruding portion 46 in the left-right direction. Similarly, the right side surface of the left protruding portion 46 and the left side surface of the left second downward extending portion 87a face each other in the left-right direction. This prevents the left second downward extending portion 87a from moving to the left of the corresponding protruding portion 46 in the left-right direction. That is, the engagement of the engaging claw 88 with the engaged portion 48 can be maintained satisfactorily. 6, in this embodiment, the distance in the front-to-rear direction between the tip surface 88a of the engaging claw 88 of the second downward extending portion 87a and the flat surface 86b of the positioning protrusion 86 is set to be approximately equal to the front-to-rear dimension of the base 12. As a result, by engaging the engaging claw 88 with the corresponding engaged portion 48, a configuration can be realized in which the positioning protrusion 86 presses the inner surface 12a of the base 12 of the first magnetic core 11a against the first side surface 41a.

[0045] Similarly, as shown in Figures 2, 5, 6 and 7, the second side surface 42a (rear side surface of the second flange portion 42) is formed with a pair of left and right engaged portions 48 with which the second downward extension portion 87b engages, and a pair of left and right protrusion portions 46 connected to the engaged portions 48. Each engaged portion 48 on the second side surface 42a is formed, for example, in a shape that is approximately symmetrical in the front-to-rear direction with each engaged portion 48 on the first side surface 41a. Therefore, each engaged portion 48 on the second side surface 42a protrudes rearward from the second side surface 42a, and each engaged portion 48 includes a tapered portion and a flat portion. 5, one engaging claw 88 of the second downward extending portion 87b engages with each engaged portion 48. When the cover member 80 is fitted onto the bobbin portion 30, the pair of second downward extending portions 87b are guided along the tapered portion of the corresponding engaged portion 48 toward the flat portion of the engaged portion 48. The lower surface of the flat portion of the engaged portion 48 is in surface contact with the upper surface of the engaging claw 88. The tip surface 88a of the engaging claw 88 is in surface contact with the second side surface 42a. 4, the left side surface of the right protrusion 46 and the right side surface of the right second downward extending portion 87b face each other in the left-right direction. This prevents the right second downward extending portion 87b from moving to the right of the corresponding protrusion 46 in the left-right direction. Similarly, the right side surface of the left protrusion 46 and the left side surface of the left second downward extending portion 87b face each other in the left-right direction. This prevents the left second downward extending portion 87b from moving to the left of the corresponding protrusion 46 in the left-right direction. In other words, the engagement of the engaging claw 88 with the engaged portion 48 can be maintained satisfactorily.

[0046] 3 and 5, the coil device 100 has a second adhesive 92 applied to the upper surface of the first magnetic core 11a. The first magnetic core 11a (and therefore the second magnetic core 11b) is fixed to each of the cover member 80 and the bobbin portion 30 by the second adhesive 92. 1, the second adhesive 92 is applied in a substantially linear manner in the left-right direction along the upper surface of the base 12 and the first side surface 41a of the first magnetic core 11a. The second adhesive 92, for example, encloses a portion of the engaging claws 88 of the pair of second downward extending portions 87a and a portion of the lower end of the downward extending portion 84. This makes it possible to maintain the state in which the engaging claws 88 are engaged with the corresponding engaged portions 48 and to suppress relative displacement of the downward extending portions 84 (and therefore the positioning protrusions 86) with respect to the first magnetic core 11a. 5 and 6, the coil device 100 has a buffer material 94 applied to the upper surface of the second magnetic core 11b. The buffer material 94 fixes the second magnetic core 11b (and thus the first magnetic core 11a) to the cover member 80 and the bobbin portion 30. The buffer material 94 is applied in a substantially linear manner in the left-right direction along the upper surface of the base 12 of the second magnetic core 11b and the second side surface 42a. The buffer material 94, for example, includes a portion of the engaging claws 88 of the pair of second downward extending portions 87b. Note that a portion of the buffer material 94 may, for example, enter a gap 96 between the second side surface 42a and the inner surface 12a of the second magnetic core 11b. In this embodiment, the second adhesive 92 contains, for example, a hard resin material, which allows the first magnetic core 11a to be securely fixed to the cover member 80 and the bobbin portion 30. On the other hand, the buffer material 94 is made of, for example, a soft resin material. This allows the buffer material 94 to effectively absorb vibrations even when the coil device 100 is subjected to vibrations. In other words, the structural strength of the coil device 100 can be improved.

[0047] The coil component 100 according to this embodiment is configured as described above. As an example, the coil component 100 can be used as a high-voltage pulse transformer. However, the use of the coil component 100 is not limited to this example.

[0048] The coil device 100 can be assembled, for example, as follows. First, each winding 71 of the coil 70 (first coil 70a and second coil 70b) is wound around the tubular portion 31 of the bobbin portion 30. The end of each winding 71 is wound around the winding terminal 66 of the corresponding terminal portion 60, and fixed by welding or soldering. Next, the insertion portion 15 of the first magnetic core 11a is inserted into the insertion hole 36 from the front opening of the insertion hole 36, while the insertion portion 15 of the second magnetic core 11b is inserted into the insertion hole 36 from the rear opening of the insertion hole 36. Next, the cover member 80 is placed over the bobbin portion 30 from above. At this time, for example, the engaging claws 88 of each second downward extending portion 87 are first positioned along the tapered portion of the corresponding engaged portion 48, and the lower surface or tip surface of the engaging claws 88 are positioned in contact with the upper end of the flat portion of the engaged portion 48. Furthermore, the inclined surface 86a of the positioning protrusion 86 is positioned in point contact or line contact with the base portion 12 of the first magnetic core 11a. Then, the cover member 80 is pushed downward relative to the main body member 20 until the engaging claws 88 of each second downward extending portion 87 are engaged with the corresponding engaged portion 48. At this time, the engaging claws 88 of the second downward extending portions 87 slide downward along the inclined surface of the tapered portion of the corresponding engaged portion 48 and reach the lower surface of the flat portion of the engaged portion 48. Furthermore, the base 12 of the first magnetic core 11a slides toward the bobbin part 30 along the inclined surface 86a of the positioning protrusion 86, and the inner surface 12a of the base 12 makes surface contact or line contact with the first side surface 41a. In this state, the flat surface 86b makes surface contact with the outer surface 12b of the base 12. In this manner, the cover member 80 is fitted onto the bobbin portion 30 . Next, the first magnetic core 11a and the second magnetic core 11b are fixed to each other with the first adhesive 91, and the magnetic core 10 is fixed to the bobbin portion 30 and the cover member 80 with the second adhesive 92 and the buffer material 94, respectively. As described above, the positioning protrusion 86 is disposed along the outer surface of the outer portion (the outer surface 12b of the base 12) and prevents the outer portion from moving away from the bobbin portion 30 in the axial direction of the insertion hole 36. Therefore, for example, a desired positional relationship between the first magnetic core 11a and the second magnetic core 11b and a desired positional relationship between the magnetic core 10 and the bobbin portion 30 can be easily achieved without using a dedicated jig. In other words, the first magnetic core 11a and the second magnetic core 11b can be fixed, and the magnetic core 10 can be fixed to the bobbin portion 30 and the cover member 80, without interference from the jig. This improves the ease of manufacturing the coil device 100. In this way, the coil component 100 is obtained.

[0049] <Modification> Next, a modified example will be described with reference to FIGS. 9 to 11(c). The coil component 100 of this modified example differs from the coil component 100 of the above embodiment in the points described below, but is otherwise configured in the same way as the coil component 100 of the above embodiment.

[0050] In the embodiment, an example was described in which the positioning protrusion 86 has an inclined surface 86a, but in the case of the present invention, as shown in Figures 9 to 11(c), as an example, the positioning protrusion 86 does not have an inclined surface 86a, and a flat surface 86b arranged vertically forms the rear end surface of the positioning protrusion 86. The flat surface 86b is in surface contact with the outer surface 12b of the first magnetic core 11a. The front-to-rear dimension of the positioning protrusion 86 is substantially constant regardless of the position in the up-down direction, for example. Even with this configuration, the positioning protrusion 86 prevents the outer portion from moving away from the bobbin portion 30 in the axial direction of the insertion hole 36. Therefore, a desired positional relationship between the bobbin portion 30 and the magnetic core 10 can be easily achieved.

[0051] Although the embodiments have been described above with reference to the drawings, these are merely examples of the present invention, and various other configurations can also be adopted.

[0052] For example, in the above description, the positioning protrusion 86 is disposed along the outer surface of the outer portion to prevent the outer portion from moving away from the bobbin portion 30 in the axial direction of the insertion hole 36. However, in the present invention, for example, as shown in FIG. 12 , the positioning protrusion 86 may be disposed between the inner surface of the outer portion and the bobbin portion 30 to prevent the outer portion from approaching the bobbin portion 30 in the axial direction of the insertion hole 36. In this case, the positioning protrusion 86 is, for example, a leaf spring that elastically biases the outer portion of the first magnetic core 11a toward the opposite side from the bobbin portion 30 in the axial direction of the insertion hole 36. However, the positioning protrusion 86 may also be a spacer inserted between the inner surface of the outer portion and the bobbin portion 30.

[0053] Furthermore, the present invention is not limited to the configuration in which the cover member 80 has the positioning protrusion 86 as described above, and the bobbin portion 30 may have the positioning protrusion 86. In this case, the positioning protrusion 86 is provided, for example, on the terminal holding portion 50 or the flange portion 40 of the bobbin portion 30, and is disposed between the inner surface of the outer portion and the bobbin portion 30 to restrict the outer portion from approaching the bobbin portion 30 in the axial direction of the insertion hole 36. More specifically, the positioning protrusion 86 is, for example, a leaf spring that elastically biases the outer portion of the first magnetic core 11a toward the opposite side to the bobbin portion 30 in the axial direction of the insertion hole 36. With this configuration as well, a desired positional relationship between the magnetic core 10 and the bobbin portion 30 can be achieved.

[0054] Furthermore, although the above describes an example in which the magnetic core 10 is configured to include two E cores, the present invention is not limited to this example, and the magnetic core 10 may also be configured to include an E core and an I core. Furthermore, the magnetic core 10 may be configured to include two T cores, or to include a T core and an I core. In this case, the overall shape of the magnetic core 10 is H-shaped in plan view.

[0055] Furthermore, in the above, an example has been described in which the magnetic core 10 has two components (first magnetic core 11a and second magnetic core 11b), but the magnetic core 10 may be an integrated whole, or may be configured with three or more components.

[0056] The present embodiment encompasses the following technical ideas. (1) a bobbin portion having an insertion hole; a magnetic core having an insertion portion inserted into the insertion hole and an outer portion disposed outside the bobbin portion; a coil wound around the bobbin portion; a cover member covering an upper portion of the bobbin portion; Equipped with the cover member has a positioning protrusion that positions the magnetic core, The positioning protrusion is a coil component that is arranged along the outer surface of the outer placement portion to prevent the outer placement portion from moving away from the bobbin portion in the axial direction of the insertion hole, or is arranged between the inner surface of the outer placement portion and the bobbin portion to prevent the outer placement portion from moving closer to the bobbin portion in the axial direction of the insertion hole. (2) The coil component according to (1), wherein the positioning protrusion presses the outer surface of the outer placement portion in a direction in which the outer placement portion approaches the bobbin portion in the axial direction of the insertion hole. (3) The magnetic core includes a first magnetic core and a second magnetic core that are arranged opposite to each other and are combined with each other, At least one of the first magnetic core and the second magnetic core has the insertion portion, Both the first magnetic core and the second magnetic core have the outer disposed portion, the positioning protrusion presses the outer portion of the first magnetic core toward the bobbin portion, a surface of the outer portion of the first magnetic core facing the outer portion of the second magnetic core is in contact with the bobbin portion; The coil component according to (2), wherein a gap is formed between the bobbin portion and a surface of the outer portion of the second magnetic core that faces the outer portion of the first magnetic core. (4) The cover member is a top surface portion covering the bobbin portion; a downward extension portion extending downward from a peripheral edge portion of the top surface portion; and The coil component according to (2) or (3), wherein the positioning protrusion is formed at a lower end of the downward extension. (5) A coil component as described in (4), wherein the surface of the positioning protrusion facing the outer placement portion of the first magnetic core has an inclined surface that slopes upward in a direction approaching the outer placement portion. (6) The cover member has a second downward extension portion extending downward from the peripheral edge portion of the top surface portion, The second downward extension portion has an engaging claw, The coil component according to (4) or (5), wherein the engaging claw engages with the bobbin portion. (7) The coil component according to (6), wherein the cover member has a pair of the second downward extending portions sandwiching the downward extending portion therebetween. (8) The cover member is the second downward extension portion disposed on the same side as the downward extension portion with respect to the bobbin portion; the second downward extension portion disposed on the opposite side of the downward extension portion with respect to the bobbin portion; The coil component according to (6) or (7), (9) a bobbin portion having an insertion hole; a magnetic core having an insertion portion inserted into the insertion hole and an outer portion disposed outside the bobbin portion; a coil wound around the bobbin portion; a cover member covering an upper portion of the bobbin portion; Equipped with the bobbin portion has a positioning protrusion portion that positions the magnetic core, The positioning protrusion is a coil component that is arranged between the inner surface of the outer placement portion and the bobbin portion and restricts the outer placement portion from approaching the bobbin portion in the axial direction of the insertion hole. [Explanation of symbols]

[0057] 10 Magnetic Core 11a First magnetic core 11b Second magnetic core 12 Base (outer placement part) 12a Inner surface 12b External surface 13 External legs 15 Insertion section 20 Main body member 30 Bobbin section 31 Cylinder part 32 Upper wall 33 Lower wall part 34 Front wall 35 Rear wall 36 Insertion hole 40 Tsuba 41 First flange 41a 1st side 42 Second flange 42a 1st side 46 Protrusion 48 Engaged part 50 Terminal holding part 52 1st terminal holding part 53 1st protrusion 55 2nd terminal holding part 56 2nd protrusion 60 Terminal section 61 1st terminal section 62 2nd terminal section 65 External terminal 66 Binding terminal 70 coils 71 Windings 72 Winding section 80 Cover member 81 Top section 81a Periphery 81b Notched portion 82 Side peripheral wall 82a First side wall part 82b Second side wall part 83 Protrusion 84 Downward extension 84a 1st contact surface 84b Second contact surface 85 Main Section 86 Positioning protrusion 86a Slope 86b Step surface 87 Second downward extension part 88 Engagement claw 89a First slit section 89b Second slit section 91 First Adhesive 92 Second Adhesive 94 Cushioning material 96 Gap 100 Coil parts

Claims

1. a bobbin portion having an insertion hole; a magnetic core having an insertion portion inserted into the insertion hole and an outer portion disposed outside the bobbin portion; a coil wound around the bobbin portion; a cover member covering an upper portion of the bobbin portion; Equipped with the bobbin portion has a first side surface disposed on one side in an axial direction of the insertion hole and a second side surface disposed on the other side opposite to the one side in the axial direction, the cover member has a positioning protrusion that positions the magnetic core, the positioning protrusion is disposed along an outer surface of the outer placement portion and prevents the outer placement portion from moving away from the bobbin portion in the axial direction of the insertion hole, The magnetic core includes a first magnetic core and a second magnetic core that are arranged opposite to each other and fixed to each other, At least one of the first magnetic core and the second magnetic core has the insertion portion, Both the first magnetic core and the second magnetic core have the outer disposed portion, a first outer portion that is the outer portion of the first magnetic core is disposed on the one side in the axial direction, a second outer portion that is the outer portion of the second magnetic core is disposed on the other side in the axial direction, the positioning protrusion is selectively disposed on the one side of the one side and the other side in the axial direction, the positioning protrusion presses the outer surface of the first outer arrangement portion in a direction in which the first outer arrangement portion approaches the first side surface in the axial direction, a surface of the first outer portion facing the second outer portion is in contact with the first side surface, A coil component in which a gap is formed between a surface of the second outer arrangement portion that faces the first outer arrangement portion and the second side surface.

2. The magnetic core includes a first magnetic core and a second magnetic core that are arranged opposite to each other and are combined with each other, At least one of the first magnetic core and the second magnetic core has the insertion portion, Both the first magnetic core and the second magnetic core have the outer disposed portion, the positioning protrusion presses the outer portion of the first magnetic core toward the bobbin portion, a surface of the outer portion of the first magnetic core facing the outer portion of the second magnetic core is in contact with the bobbin portion; The coil component according to claim 1 , wherein a gap is formed between the bobbin portion and a surface of the outer portion of the second magnetic core that faces the outer portion of the first magnetic core.

3. The cover member is a top surface portion covering the bobbin portion; a downward extension portion extending downward from a peripheral edge portion of the top surface portion; and The coil component according to claim 1 or 2, wherein the positioning protrusion is formed at a lower end of the downward extension.

4. The coil component according to claim 3 , wherein the surface of the positioning protrusion that faces the outer portion of the first magnetic core has an inclined surface that is inclined upward in a direction approaching the outer portion.

5. the cover member has a second downward extension portion extending downward from a peripheral edge portion of the top surface portion, The second downward extension portion has an engaging claw, 5. The coil component according to claim 3, wherein the engaging claw engages with the bobbin portion.

6. The coil component according to claim 5 , wherein the cover member has a pair of the second downward extending portions sandwiching the downward extending portion therebetween.

7. The cover member is the second downward extension portion disposed on the same side as the downward extension portion with respect to the bobbin portion; the second downward extension portion disposed on the opposite side of the downward extension portion with respect to the bobbin portion; The coil component according to claim 5 or 6, comprising:

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