Coil parts

Abstract

To provide a coil component having a structure which can easily achieve a desired positional relationship between a cover member and a bobbin part.SOLUTION: A coil component 100 comprises a bobbin part 30, a magnetic core 10, a coil 70, and a cover member 80. At least one of the cover member 80 and the bobbin part 30 has a spring piece 83 for elastically biasing the other. With biasing force of the spring piece 83, at least one of the cover member 80 and the bobbin part 30 elastically biases the other. At least the other one of the cover member 80 and the bobbin part 30 has a protruding part 46 and a recessed part 47. A tip end part 83c of the spring piece 83 has: a contact part 84a which biases the protruding part 46; and an entry part 84b which enters the recessed part 47. At a contact portion between the contact part 84a and the protruding part 46, the spring piece 83 is bent so as to generate force for the cover member 80 to bias the bobbin part 30 upward.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, a magnetic core inserted into the bobbin portion, and a cover member (referred to as a case in the document) covering the bobbin portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP2014-236128 Public Relations Summary of the Invention [Problem to be solved by the invention]

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

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

[0006] According to the present invention, there is provided a bobbin portion, A magnetic core inserted through the bobbin portion; A coil wound around the bobbin portion; a cover member that is fitted onto the bobbin portion to cover the bobbin portion; A coil component comprising: At least one of the cover member and the bobbin portion has a spring piece that elastically biases the other of the cover member and the bobbin portion, the spring piece has a cantilever structure in which one end of the spring piece in a direction in which the cover member is inserted relative to the bobbin portion is supported and extends from the one end toward a tip of the spring piece, The biasing force of the spring piece In a direction perpendicular to the direction of the extrapolation At least one of the cover member and the bobbin portion elastically biases the other in a first direction, At least the other of the cover member and the bobbin portion has a convex portion and a concave portion that is recessed toward the first direction side relative to the convex portion, the recess is adjacent to the protrusion on a side in an extension direction of the spring piece, a tip end portion of the spring piece has a contact portion that contacts the protruding portion and biases the protruding portion, and an entry portion that is located on the tip side of the contact portion and enters the recessed portion, The entry portion is located on the side of the contact portion in the first direction, and the cover member covers the bobbin portion at a contact point between the contact portion and the protruding portion. The direction opposite to the direction of the extrapolation In one embodiment, a coil component is provided in which the spring piece is bent so as to generate a biasing force against the coil. Effect of the Invention

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

[0008] [Figure 1] FIG. 2 is a perspective view of a coil component according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the coil component according to the embodiment. [Diagram 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. [Diagram 5]FIG. 2 is a bottom view of the coil component according to the embodiment. [Figure 6] FIG. 5 is a cross-sectional view taken along line A-A in FIG. [Figure 7] 5 is a cross-sectional view taken along line AA of FIG. 4, showing the cover member in the embodiment. [Figure 8] FIG. 2 is a perspective view of a cover member and a bobbin portion in the embodiment. [Figure 9] 9(a), 9(b) and 9(c) show a main body member in the embodiment, with FIG. 9(a) being a perspective view, FIG. 9(b) being a front view and FIG. 9(c) being a plan view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to Fig. 1 to Fig. 9(c). Note that the first fixing tape 90 and the second fixing tape 95 are omitted from Fig. 1 and Fig. 3. Fig. 8 shows a state in which the cover member 80 and the bobbin portion 30 are assembled together. In addition, in all drawings, similar components are given the same symbols and descriptions are omitted as appropriate.

[0010] As shown in any one of Figures 1 to 9(c), the coil device 100 of this embodiment includes a bobbin portion 30, a magnetic core 10 inserted into the bobbin portion 30, a coil 70 wound around the bobbin portion 30, and a cover member 80 that is extrapolated onto the bobbin portion 30 to cover the bobbin portion 30. As shown in Figures 3 and 6, at least one of the cover member 80 and the bobbin portion 30 has a spring piece 83 that elastically biases the other, and the spring piece 83 has a cantilever structure in which one end 83a of the spring piece 83 in the direction of extrapolation of the cover member 80 relative to the bobbin portion 30 is supported and extends from the one end 83a toward a tip end 83c of the spring piece 83. Due to the biasing force of the spring piece 83, at least one of the cover member 80 and the bobbin portion 30 elastically biases the other (the other of the cover member 80 and the bobbin portion 30) in a first direction parallel to the mounting surface, and at least the other of the cover member 80 and the bobbin portion 30 has a convex portion 46 and a concave portion 47 that is recessed toward the first direction side more than the convex portion 46. The recess 47 is adjacent to the side of the extension direction of the spring piece 83 relative to the protrusion 46, and the tip 83c of the spring piece 83 has a contact portion 84a that contacts the protrusion 46 and biases the protrusion 46, and an entry portion 84b that is located on the tip side of the contact portion 84a and penetrates into the recess 47. The entry portion 84b is located on the first direction side of the contact portion 84a, and the spring piece 83 is bent so that a force is generated at the contact point between the contact portion 84a and the protrusion 46 that causes the cover member 80 to urge the bobbin portion 30 upward. In the present embodiment, as an example, the left side in FIG. 6 is the first direction, and the opposite direction to the first direction (the right side) is the second direction. However, in the present invention, the first direction and the second direction are not limited to the above example, and can be set appropriately depending on the structure of each component constituting coil device 100 and the desired positional relationship between each component. In addition, applying a force in a first direction means that when the force is vector-decomposed into three directions, namely, the first direction, a direction parallel to the mounting surface and perpendicular to the first direction, and a direction perpendicular to the mounting surface, the component in the first direction is the largest among these three directions. Moreover, the convex portion 46 is a portion that protrudes in the second direction relatively more than the concave portion 47. In other words, the concave portion 47 is a portion that is recessed in the first direction relatively more than the convex portion 46.

[0011] According to this embodiment, at least one of the cover member 80 and the bobbin portion 30 elastically biases the other in the first direction. Therefore, even if there is manufacturing variation in the dimensions of either or both of the cover member 80 and the bobbin portion 30 in the first direction or the second direction (left-right direction), the cover member 80 and the bobbin portion 30 can be positioned relative to each other in the first direction and the second direction, so that it is possible to suppress relative positional deviation between the cover member 80 and the bobbin portion 30 in the first direction and the second direction. Moreover, at least one of the cover member 80 and the bobbin portion 30 elastically deforms in response to the manufacturing variation, thereby absorbing the manufacturing variation. Furthermore, according to this embodiment, the spring piece 83 is bent so that the entry portion 84b is located closer to the first direction side than the contact portion 84a, and a force is generated at the contact point between the contact portion 84a and the protrusion 46 such that the cover member 80 urges the bobbin portion 30 upward. This restricts the displacement of the cover member 80 relative to the bobbin portion 30. In other words, the bobbin portion 30 can be restricted from being displaced downward relative to the cover member 80. This restricts the bobbin portion 30 from falling off the cover member 80. Also, rattling of the cover member 80 relative to the bobbin portion 30 in the vertical direction can be suppressed. In this manner, according to this embodiment, a desired positional relationship between the cover member 80 and the bobbin portion 30 can be easily achieved. Furthermore, according to the present embodiment, by extrapolating the cover member 80 onto the bobbin portion 30, it is possible to position the cover member 80 and the bobbin portion 30 relative to each other in the first and second directions without using a dedicated jig, and to prevent the bobbin portion 30 from falling off the cover member 80. This improves ease of manufacture of the coil device 100. Moreover, according to this embodiment, the spring piece 83 has a cantilever structure in which one end of the spring piece 83 in the direction of extrapolation of the cover member 80 relative to the bobbin portion 30 is supported. This allows the spring piece 83 to be elastically deformed with a sufficient amount of displacement. Therefore, even if manufacturing variations occur in the dimensions of either or both of the bobbin portion 30 and the cover member 80 in the first and second directions, the spring piece 83 can be elastically deformed in response to the manufacturing variations, thereby more effectively absorbing the manufacturing variations. Therefore, the cover member 80 can favorably bias the bobbin portion 30 regardless of the manufacturing variations. Furthermore, according to this embodiment, the spring piece 83, the convex portion 46, and the concave portion 47 can not only regulate the relative positional misalignment between the cover member 80 and the bobbin portion 30 in the left-right direction (first direction and second direction), but can also regulate the relative positional misalignment between the cover member 80 and the bobbin portion 30 in the up-down direction. Therefore, there is no need to provide a separate misalignment regulation structure for regulating such misalignment in the up-down direction, and therefore freedom in designing the coil component 100 can be ensured.

[0012] In the following description, the up-down direction is referred to as the Z direction. The bottom (lower side) is the side on which terminal parts 60 (FIG. 1, etc.) described later are arranged, that is, the mounting surface side on which coil component 100 is mounted. However, the positional relationships of the various parts (particularly the up-down positional relationships) during manufacture and use of coil component 100 are not limited to the positional relationships described in this specification. The axial direction of the coil 70 extends in a direction perpendicular to the Z direction. The axial direction of the coil 70 is referred to as the X direction, one side in the X direction is referred to as the right (right side), and the other side is referred to as the left (left side). Moreover, a direction perpendicular to both the X direction and the Z direction is referred to as a Y direction, one side of the Y direction is referred to as the front (forward) and the other side is referred to as the rear (rear). These directions are indicated in each figure. Furthermore, in the X direction, the side where the center position of the coil 70 in the axial direction of the coil 70 is located is referred to as the inner side (inner side), and the opposite side to the inner side is referred to as the outer side (outer side). Similarly, in the Y direction, the side where the center position of the coil 70 in the front-to-rear direction is located is referred to as the inner side (inner side), and the opposite side to the inner side is referred to as the outer side (outer side). 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).

[0013] As shown in FIG. 2, in this embodiment, the magnetic core 10 includes, for example, a pair of left and right core members, i.e., a first core member 11a arranged on the right side and a second core member 11b arranged on the left side. Each of the first core member 11a and the second core member 11b is, for example, a so-called E core, and has an E-shaped planar shape (see FIG. 4). More specifically, the first core member 11a includes a base 12 extending in the front-rear direction, a pair of outer legs 13 protruding leftward from both ends of the base 12, and a core 15 protruding leftward from a middle portion of the base 12. The protruding directions of the outer legs 13 and the core 15 from the base 12 are the same as the axial direction of the coil 70. The base 12 is, for example, long in the front-rear direction and is formed into a prismatic shape with a rectangular cross section perpendicular to the axial direction. In the base 12, two of the four faces arranged around the axis are horizontal upper and lower faces, respectively, and one of the remaining two faces (hereinafter, inner face 12c) faces the bobbin part 30 side, and the other (hereinafter, outer face 12d) faces the opposite side of the bobbin part 30. In the case of this embodiment, the inner face 12c of the base 12 constitutes the inner face of the first core member 11a, and the outer face 12d of the base 12 constitutes the outer face of the first core member 11a. Each of the outer legs 13 and the core 15 is elongated in the left-right direction, and has a rectangular cross-sectional shape perpendicular to the axial direction. More specifically, for example, in the outer legs 13 and the core 15, two of the four faces arranged around the axis are horizontal upper and lower faces, respectively, and one of the remaining two faces faces forward and the other faces backward. The base 12, the outer legs 13, and the core 15 are set to have the same vertical dimensions, for example. In the first core member 11a, the upper surface of the base 12, the upper surfaces of the outer legs 13, and the upper surface of the core 15 are arranged flush with each other. That is, the entire upper surface of the first core member 11a is formed flat and arranged horizontally. Similarly, in the first core member 11a, the lower surface of the base 12, the lower surfaces of the outer legs 13, and the lower surfaces of the core 15 are arranged flush with each other. That is, the entire lower surface of the first core member 11a is formed flat and arranged horizontally.

[0014] The second core member 11b is formed, for example, in the same shape as the first core member 11a. That is, the second core member 11b includes a base portion 12, a pair of outer legs 13, and a core portion 15. The base portion 12 has an upper surface, a lower surface, an inner surface 12c, and an outer surface 12d. It is disposed symmetrically with respect to the first core member 11a.

[0015] The tip end surface in the protruding direction of each of the outer legs 13 of the first core member 11a and the second core member 11b is formed flat and forms a vertical surface perpendicular to the axial direction of the coil . Similarly, the tip surface of each of the first core member 11a and the second core member 11b in the protruding direction of the core portion 15 is formed flat and forms a vertical surface perpendicular to the axial direction of the coil . 4, the inner surface 12c and the outer surface 12d 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 core member 11a and the inner surface of the second core member 11b face each other, and the outer surface of the first core member 11a and the outer surface of the second core member 11b face in opposite directions.

[0016] The bobbin portion 30 includes, for example, a cylindrical portion 31 and a pair of flange portions 40 provided on both ends of the cylindrical portion 31 in the axial direction. The cylindrical portion 31 is formed in a square cylindrical shape having a through hole 36 that passes through in the axial direction. The axial direction of the cylindrical portion 31 (the axial direction of the through hole 36) is the left-right direction and coincides with the axial direction of the coil 70. The tubular portion 31 is configured to include an upper wall portion 32 and a lower wall portion 33 that are each arranged horizontally, and a front wall portion 34 and a rear wall portion 35 that are each arranged vertically, as shown in Figures 9(b) and 9(c), for example. For example, the internal space of the through hole 36 is shaped like a rectangular column. The bottom surface (inner peripheral bottom surface) and the top surface of the inner circumferential surface of the through hole 36 are horizontal surfaces, and the front and rear surfaces of the inner circumferential surface of the through hole 36 are vertical surfaces.

[0017] As shown in Figures 9(a), 9(b) and 9(c), the bobbin portion 30 has, for example, a pair of flange portions 40, namely, a first flange portion 41 located on the right side and a second flange portion 42 located on the left side. The first flange portion 41 and the second flange portion 42 each protrude from both ends of the cylindrical portion 31 toward the outer periphery of the cylindrical portion 31, for example. More specifically, the first flange 41 is formed, for example, in a flat plate shape perpendicular to the axial direction of the tube portion 31. The second flange 42 is formed, for example, in a flat rectangular parallelepiped shape whose left-right dimension is smaller than its up-down and front-rear dimensions, and each of the right and left faces is perpendicular to the first direction. The left-right dimension (thickness dimension) of the first flange portion 41 is smaller than the left-right dimension (thickness dimension) of the second flange portion 42. The front-to-rear dimension of the first flange portion 41 is equal to the front-to-rear dimension of the second flange portion 42, and the top-to-bottom dimension of the first flange portion 41 is equal to the top-to-bottom dimension of the second flange portion 42. In addition, the front end surface of the first flange portion 41 and the front surface of the second flange portion 42 are arranged flush with each other, and the rear end surface of the first flange portion 41 and the rear surface of the second flange portion 42 are arranged flush with each other.

[0018] 2, the bobbin portion 30 includes 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. More specifically, as shown in Figures 9(a), 9(b) and 9(c), the bobbin portion 30 has, as a terminal holding portion 50, a first terminal holding portion 52 arranged on the right side and a second terminal holding portion 55 arranged on the left side. The first terminal holding portion 52 is formed, for example, in the shape of a flattened rectangular column that is long in the front-rear direction and whose left-right dimension is smaller than its up-down dimension. The second terminal holding portion 55 is formed, for example, in a flat plate shape that is long in the front-rear direction and whose top-to-bottom dimension is smaller than its left-to-right dimension. Here, the lower surface of the second terminal holding portion 55 has, for example, a protruding portion 59 (see FIGS. 1 and 3) hanging down from the right edge. The protruding portion 59 is formed in a flat plate shape with the plate surface facing the left-right direction. The right side surface of the protruding portion 59 is disposed flush with the right side surface of the second terminal holding portion 55. The first terminal holding portion 52 protrudes to the right and in the front-rear direction from the lower edge of the first flange portion 41. The second terminal holding portion 55 protrudes to the left and in the front-rear direction from the lower edge of the second flange portion . In this embodiment, the left-right dimension of first terminal holding portion 52 is smaller than the left-right dimension of second terminal holding portion 55. The up-down dimension of first terminal holding portion 52 is larger than the up-down dimension of second terminal holding portion 55 (excluding overhang portion 59). The front-to-rear dimension of first terminal holding portion 52 is equal to the front-to-rear dimension of second terminal holding portion 55. In addition, the height position of the lower end surface of overhang portion 59 is equal to the height position of the lower end surface of first terminal holding portion 52. However, the dimensional relationship between first terminal holding portion 52 and second terminal holding portion 55 is not particularly limited, and first terminal holding portion 52 and second terminal holding portion 55 may have the same dimensions. The upper surface of each of the first terminal holding portion 52 and the second terminal holding portion 55 is formed flat and disposed horizontally. The first terminal holding portion 52 holds, for example, a first terminal portion 61, a second terminal portion 62, and a third terminal portion 63, which will be described later. The second terminal holding portion 55 holds, for example, a fourth terminal portion 64, which will be described later.

[0019] As shown in FIGS. 4 and 5, in this embodiment, the coil device 100 has, as the terminal portion 60, for example, a first terminal portion 61, a second terminal portion 62, a third terminal portion 63, and a fourth terminal portion 64. The first terminal portion 61 to the third terminal portion 63 are arranged in the front-rear direction in the order of the first terminal portion 61, the second terminal portion 62, and the third terminal portion 63 from the front side in the first terminal holding portion 52. The fourth terminal portion 64 is arranged in the second terminal holding portion 55.

[0020] The first terminal portion 61 is formed, for example, by bending a long, plate-like metal member. 2 and 3, the first terminal portion 61 has a lower end portion exposed from the first terminal holding portion 52, and an upper end portion and an intermediate portion (not shown) embedded in the first terminal holding portion 52. The lower end portion of the first terminal portion 61 is an external terminal 65 that is externally connected when the coil device 100 is mounted. More specifically, the first terminal portion 61 is folded back inside the first terminal holding portion 52, and the shape of the first terminal portion 61 is a laid-over U-shape when viewed from the front. The external terminal 65 of the first terminal portion 61 protrudes downward from the bottom surface of the first terminal holding portion 52 and further extends rightward. That is, the extending direction of the tip of the external terminal 65 of the first terminal portion 61 coincides with the second direction.

[0021] For example, the third terminal portion 63 is formed in the same shape as the first terminal portion 61. Thus, the third terminal portion 63 has external terminals 65 exposed to the outside from the first terminal holding portion 52, and an upper end portion and a middle portion (not shown) embedded in the first terminal holding portion 52.

[0022] The second terminal portion 62 is formed, for example, by bending a long, plate-like metal member that is forked downward into two parts. As shown in Figures 2 and 6, the second terminal portion 62 has a pair of front and rear leg portions 62b that are each exposed to the outside from the bottom surface of the first terminal holding portion 52, and a connecting portion (not shown) that is embedded in the first terminal holding portion 52 and connects the pair of leg portions 62b and the extension portion 62c. The pair of legs 62b are external terminals 65 to be connected to the outside when the coil component 100 is mounted. The second terminal portion 62 is folded back inside the first terminal holding portion 52, and when viewed from the front and in a plan view, the shape of the second terminal portion 62 is an inverted U-shape and is open downward. Each external terminal 65 of the second terminal portion 62 protrudes downward from the bottom surface of the first terminal holding portion 52 and further extends rightward. That is, the extending direction of the tip of each external terminal 65 of the second terminal portion 62 coincides with the second direction.

[0023] The length dimensions in the left-right direction of each of the external terminals 65 of the first terminal portion 61 to the third terminal portion 63 are set to be, for example, equal to each other. Moreover, the thickness dimensions of the plate-like metal members constituting the first terminal portion 61 to the third terminal portion 63 are set to be equal to each other.

[0024] The fourth terminal portion 64 is formed, for example, by bending a long, plate-like metal member that is forked downward into two parts. As shown in Figures 3 and 6, the fourth terminal portion 64 has a pair of front and rear leg portions 64b that are each exposed to the outside from the bottom surface of the second terminal holding portion 55, and a connecting portion 64a that is embedded across the second terminal holding portion 55 and the second flange portion 42 and connects the pair of leg portions 64b together. The pair of legs 64b are external terminals 65 to be connected to the outside when the coil component 100 is mounted. The fourth terminal portion 64 is folded back inside the second terminal holding portion 55 and the second flange portion 42, and in side and plan views, the shape of the fourth terminal portion 64 is an inverted U-shape and is open downward. 9(a) and 9(c), for example, each external terminal 65 protrudes downward from the bottom surface of the second terminal holding portion 55 and further extends leftward. That is, the extending direction of the tip portion of the external terminal 65 of the fourth terminal portion 64 coincides with the first direction.

[0025] The length dimensions in the left-right direction of each of the external terminals 65 of the fourth terminal portion 64 are set to be, for example, equal to each other. The thickness dimension of the plate-shaped metal member constituting the fourth terminal portion 64 is greater than the thickness dimensions of the plate-shaped metal members constituting the first terminal portion 61 to the third terminal portion 63, for example.

[0026] As shown in FIGS. 2 and 4, the coil device 100 has, as the coil 70, a first coil and a second coil, for example. 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. A winding portion 72 (see FIG. 2) is formed by the winding 71 wound around the tubular portion 31. 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 protruding from the terminal holding portion 50 (for example, a portion protruding 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 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] 2, 4, 6, and 8, the cover member 80 has a side peripheral wall portion 82 including a first wall portion 82a and a second wall portion 82b facing each other. More specifically, the cover member 80 has a rectangular tubular side peripheral wall portion 82 (first side peripheral wall portion 82) including, for example, the first wall portion 82a, the second wall portion 82b, a third wall portion 82c, and a fourth wall portion 82d. Moreover, the cover member 80 has a top surface portion 81 (see FIG. 2, etc.) that closes the upper end of the side peripheral wall portion 82. Furthermore, as shown in FIG. 2, FIG. 6 and FIG. 7, the cover member 80 is open, for example, downward. The first wall portion 82a to the fourth wall portion 82d are each formed in a flat plate shape and are disposed vertically. 4 and 6, for example, the first wall portion 82a and the second wall portion 82b face each other in the left-right direction (first direction and second direction), and the third wall portion 82c and the fourth wall portion 82d face each other in the front-rear direction. More specifically, the plate surfaces (wall surfaces) of the first wall portion 82a and the second wall portion 82b face, for example, in the left-right direction. The plate surfaces (wall surfaces) of the third wall portion 82c and the fourth wall portion 82d face, for example, in the front-rear direction. The top surface portion 81 is formed, for example, in a flat plate shape and is arranged horizontally. Since the cover member 80 has the top surface portion 81, the top surface portion 81 can be attracted by a mounter when mounting the coil component 100 on a board, and the task of mounting the coil component 100 on the board can be easily performed. However, the top surface 81 does not have to be flat. Furthermore, the cover member 80 may have a shape that does not have a top surface 81 (for example, a shape that opens both upward and downward). The cover member 80 has, for example, a protrusion 81a (see FIGS. 1 and 3) that protrudes leftward from the rear of the left side surface of the top surface portion 81. The orientation of the cover member 80 can be easily determined by the protrusion 81a.

[0028] As described above, the cover member 80 is disposed so as to cover, for example, the bobbin portion 30. More specifically, as shown in Fig. 4, for example, the first wall portion 82a covers the right side of the bobbin portion 30, the second wall portion 82b covers the left side of the bobbin portion 30, the third wall portion 82c covers the front side of the bobbin portion 30, and the fourth wall portion 82d covers the rear side of the bobbin portion 30. In addition, as shown in Fig. 3, the top surface portion 81 covers the upper side of the bobbin portion 30. In this manner, since the cover member 80 covers the bobbin portion 30, sufficient pressure resistance of the coil device 100 can be ensured.

[0029] 2 and 3, the first wall portion 82a is formed with, for example, a through hole 88a penetrating the first wall portion 82a in the left-right direction. Similarly, the second wall portion 82b is formed with, for example, a through hole 88b penetrating the second wall portion 82b in the left-right direction. The through holes 88a and 88b are disposed at positions facing each other. The through hole 88b of the second wall portion 82b is formed, for example, in a rectangular shape that is approximately the same as the shape of the through hole 36 of the bobbin portion 30 when viewed in the axial direction. On the other hand, the through hole 88a of the first wall portion 82a is formed, for example, in a substantially rectangular shape that is elongated in the front-rear direction (see FIG. 8). The upper and lower edges of the through hole 88a are each horizontally disposed. Similarly, the upper and lower edges of the through hole 88b are each horizontally disposed.

[0030] Furthermore, in this embodiment, the cover member 80 has a flange portion 86 that protrudes outward from the lower end of the side peripheral wall portion 82. More specifically, as shown in Fig. 6, the cover member 80 has the flange portion 86 that protrudes circumferentially (horizontally) from the lower end of the side peripheral wall portion 82, and a second side peripheral wall portion 85 that hangs down from the peripheral edge of the flange portion 86 and surrounds the periphery of the terminal holding portion 50. The flange portion 86 is formed, for example, in a flat plate shape and disposed horizontally. The upper surface 86a and the lower surface of the flange portion 86 are each formed as a substantially flat horizontal surface. However, the lower surface of the flange portion 86 may be formed with a protruding portion that protrudes downward, for example. 4, the second side peripheral wall portion 85 is formed, for example, in a rectangular shape in a plan view, and the internal space of the second side peripheral wall portion 85 is formed in a rectangular parallelepiped shape. The lower end of the second side peripheral wall portion 85 opens downward. In the present embodiment, the opening on the lower end side of the second side peripheral wall portion 85 constitutes the opening of the cover member 80. The second side peripheral wall portion 85 has a first wall portion 85a surrounding the right side of the terminal holding portion 50, a second wall portion 85b surrounding the left side of the terminal holding portion 50, a third wall portion 85c surrounding the front side of the terminal holding portion 50, and a fourth wall portion 85d surrounding the rear side of the terminal holding portion 50 (see Figures 4 and 5). Each of the first wall portion 85a to the fourth wall portion 85d is formed, for example, in a flat plate shape and is disposed vertically. 4, the plate surfaces (wall surfaces) of the first wall portion 85a and the second wall portion 85b face in the left-right direction, and the plate surfaces (wall surfaces) of the third wall portion 85c and the second wall portion 85b face in the front-rear direction.

[0031] 6, the left-right dimension of the portion of the flange 86 that protrudes to the right is larger than the left-right dimension of the portion that protrudes to the left. More specifically, the left-right dimension of the portion of the flange 86 that protrudes to the right is larger than the left-right dimension of the base 12 of the first core member 11a, and the left-right dimension of the portion that protrudes to the left is set to be approximately the same as or slightly larger than the left-right dimension of the base 12 of the first core member 11a.

[0032] As described above, the cover member 80 opens, for example, downward. The cover member 80 is placed over the bobbin portion 30 from above and pressed downward onto the bobbin portion 30, so that the cover member 80 is fitted onto the bobbin portion 30. Therefore, in the case of this embodiment, the direction of fitting the cover member 80 onto the bobbin portion 30 (hereinafter, may be simply referred to as the direction of fitting) is the up-down direction. Furthermore, the through holes 88a, 88b of the cover member 80 and the through hole 36 of the bobbin portion 30 are arranged coaxially with each other.

[0033] 4 and 5, the inner surface (left surface) of the first wall portion 82a is preferably arranged to face parallel to the right side surface of the first flange portion 41. The inner surface (right surface) of the second wall portion 82b is preferably arranged to face parallel to the left side surface of the second flange portion 42. The inner surface of the third wall portion 82c is preferably arranged to face parallel to each of the front end surface of the first flange portion 41 and the front end surface of the second flange portion 42. The inner surface of the fourth wall portion 82d is preferably arranged to face parallel to each of the rear end surface of the first flange portion 41 and the rear end surface of the second flange portion 42. 6, the inner surface (lower surface) of the top surface portion 81 and the upper end surface of the first flange portion 41 and the upper end surface of the second flange portion 42 face each other in close proximity to each other. However, the inner surface of the top surface portion 81 and the upper end surface of the first flange portion 41 and the upper end surface of the second flange portion 42 may be in surface contact with each other. 4 and 6, the inner surface of the first wall portion 85a is preferably arranged in parallel to face the right side surface of the first terminal holding portion 52. The inner surface of the second wall portion 85b is preferably arranged in parallel to face the left side surface of the second terminal holding portion 55. The inner surface of the third wall portion 85c is preferably arranged in parallel to face each of the front surface of the first terminal holding portion 52 and the front surface of the second terminal holding portion 55. The inner surface of the fourth wall portion 85d is preferably arranged in parallel to face each of the rear surface of the first terminal holding portion 52 and the rear surface of the second terminal holding portion 55. Moreover, it is preferable that the lower surface of the flange portion 86 be in surface contact with the bobbin portion 30 (eg, be pressed against the bobbin portion 30). 6, the lower surface of the portion of the flange portion 86 of the cover member 80 that protrudes from the first wall portion 82a to the right is preferably pressed against, for example, the upper surface of the first terminal holding portion 52 of the bobbin portion 30. The lower surface of the portion of the flange portion 86 that protrudes from the second wall portion 82b to the left is preferably pressed against, for example, the upper surface of the second terminal holding portion 55 of the bobbin portion 30. In this manner, rattling of the cover member 80 relative to the bobbin portion 30 in the vertical direction can be more reliably suppressed. As shown in FIG. 6, the protrusion 46 is preferably disposed above the upper surface of the first terminal holding portion 52. As shown in FIG.

[0034] The core portion 15 of the first core member 11a is inserted into the through hole 36 of the bobbin portion 30 via the through hole 88a of the first wall portion 82a (right side of the cover member 80) (see FIG. 1). Similarly, the core portion 15 of the second core member 11b (left side of the cover member 80) is inserted into the through hole 36 of the bobbin portion 30 via the through hole 88b of the second wall portion 82b. The tip surface of the core portion 15 of the first core member 11a and the tip surface of the core portion 15 of the second core member 11b are abutted against or adjacent to each other inside the through hole 36. That is, the tip surface of the core portion 15 of the first core member 11a and the tip surface of the core portion 15 of the second core member 11b may be in surface contact with each other or may face each other in a state of being adjacent to each other. The first core member 11a and the second core member 11b form a closed magnetic circuit. As shown in FIG. 4, a coil 70 is wound around the bobbin portion 30, and the core portion 15 is inserted into the bobbin portion 30, so that the coil 70 is wound around the magnetic core 10.

[0035] 4, the front and rear outer legs 13 of the first core member 11a are disposed outside the side peripheral wall portion 82, and are disposed along the outer surfaces of the third wall portion 82c and the fourth wall portion 82d, respectively. The base portion 12 of the first core member 11a is disposed outside the side peripheral wall portion 82, and the inner surface 12c of the base portion 12 is disposed opposite the outer surface of the first wall portion 82a. Similarly, the front and rear outer legs 13 of the second core member 11b are disposed outside the side peripheral wall portion 82 and are disposed along the outer surfaces of the third wall portion 82c and the fourth wall portion 82d, respectively. The base portion 12 of the second core member 11b is disposed outside the side peripheral wall portion 82, and the inner surface 12c of the base portion 12 is disposed opposite or in surface contact with the outer surface of the second wall portion 82b. 4, a gap is formed between the inner surface 12c of the base 12 of the first core member 11a and the outer surface of the first wall portion 82a. On the other hand, a gap may or may not be formed between the inner surface 12c of the base 12 of the second core member 11b and the outer surface of the second wall portion 82b. The tip surface of the front outer leg 13 of the first core member 11a and the tip surface of the front outer leg 13 of the second core member 11b are butted against each other or are close to each other. That is, the tip surface of the front outer leg 13 of the first core member 11a and the tip surface of the front outer leg 13 of the second core member 11b may be in surface contact with each other or may face each other in a close state. Similarly, the tip surface of the rear outer leg 13 of the first core member 11a and the tip surface of the rear outer leg 13 of the second core member 11b are butted against each other or are close to each other. The base portion 12 and the outer leg portion 13 of the first core member 11a and the second core member 11b are disposed above the flange portion 86, and are disposed along the upper surface 86a of the flange portion 86 (see FIGS. 3 and 6). The lower surface of the core portion 15 is disposed along the inner circumferential bottom surface of the through hole 36 .

[0036] 3, the lower surfaces of the first core member 11a and the second core member 11b are disposed on the same plane. The lower surfaces of the first core member 11a and the second core member 11b are disposed along the upper surface 86a of the flange portion 86. The lower surfaces of the first core member 11a and the second core member 11b and the upper surface 86a of the flange portion 86 may be in surface contact with each other, or may face each other in a close proximity to each other. As shown in FIG. 4 and FIG. 6, the outer side surface 12d of the base portion 12 of the first core member 11a is preferably disposed inside the outer surface of the first wall portion 85a of the second side peripheral wall portion 85 or flush with the outer surface. The outer side surface 12d of the base portion 12 of the second core member 11b is preferably disposed inside the outer surface of the second wall portion 85b of the second side peripheral wall portion 85 or flush with the outer surface. The outer side surface of the front outer leg portion 13 of the first core member 11a and the outer side surface of the front outer leg portion 13 of the second core member 11b are preferably disposed inside the outer surface of the third wall portion 85c of the second side peripheral wall portion 85 or flush with the outer surface. The outer side surface of the rear outer leg portion 13 of the first core member 11a and the outer side surface of the rear outer leg portion 13 of the second core member 11b are preferably disposed inside the outer surface of the fourth wall portion 85d of the second side peripheral wall portion 85 or flush with the outer surface. Thus, in the case of this embodiment, the magnetic core 10 is inserted into the bobbin portion 30 via 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 coil 70 is also maintained good, so that more stable characteristics of the coil component 100 can be achieved.

[0037] In this embodiment, the coil device 100 includes a first fixing tape 90 (see FIGS. 4 and 6) wound around the magnetic core 10. The first fixing tape 90 maintains the state in which the core portions 15 of the first core member 11a and the second core member 11b are inserted into the through-hole 36 of the bobbin portion 30. More specifically, as shown in FIG. 4, the first fixing tape 90 is wrapped, for example, around the outer surface 12d of the base 12 of the second core member 11b, the outer surface of the front outer leg 13 of the second core member 11b, the outer surface of the front outer leg 13 of the first core member 11a, the outer surface 12d of the base 12 of the first core member 11a, the outer surface of the rear outer leg 13 of the first core member 11a, the outer surface of the rear outer leg 13 of the second core member 11b, and again around the outer surface 12d of the base 12 of the second core member 11b. In the present embodiment, the first fixing tape 90 is formed in a strip shape that is long in one direction. The first fixing tape 90 may be, for example, an adhesive tape on which an adhesive layer is formed in advance, or a strip-shaped member that is bonded with an adhesive when assembling the coil component 100.

[0038] Furthermore, in this embodiment, the coil device 100 includes a second fixing tape 95 (see FIGS. 4 and 6) wound around each of the magnetic core 10 and the cover member 80. The second fixing tape 95 ensures that the magnetic core 10 is securely fixed to each of the bobbin portion 30 and the cover member 80. More specifically, as shown in Figures 4 and 6, the second fixing tape 95 is wrapped, for example, around the entire outer surface of the first fixing tape 90, and around the outer surface of the first wall portion 85a of the second side peripheral wall portion 85, the outer surface of the second wall portion 85b of the second side peripheral wall portion 85, the outer surface of the third wall portion 85c of the second side peripheral wall portion 85, and the outer surface of the fourth wall portion 85d of the second side peripheral wall portion 85. In this embodiment, the second fixing tape 95 is formed in a strip shape that is long in one direction. The second fixing tape 95 may be, for example, an adhesive tape on which an adhesive layer is formed in advance, or a strip-shaped member that is bonded using an adhesive when assembling the coil component 100. As shown in Fig. 6, an upper portion of the second fixing tape 95 is wrapped around the periphery of the first fixing tape 90.

[0039] The vertical dimension of the first fixing tape 90 is set, for example, to be approximately equal to the vertical dimension of the magnetic core 10. The vertical dimension of the second fixing tape 95 is, for example, larger than the vertical dimension of the magnetic core 10 and smaller than the vertical dimension of the cover member 80.

[0040] 4 and 5, in plan view, it is preferable that each external terminal 65 protrudes outward beyond the outline of the portion of the coil device 100 excluding the external terminals 65. It is more preferable that the protruding lengths of each external terminal 65 of the first terminal portion 61 to the third terminal portion 63 from the outline (dimensions W1, W2, W3, W4 shown in FIG. 4) are substantially equal to each other, and that the protruding lengths of each external terminal 65 of the fourth terminal portion 64 from the outline (dimensions W5, W6 shown in FIG. 4) are substantially equal to each other. In the case of this embodiment, as described above, at least one of the cover member 80 and the bobbin portion 30 elastically biases the other in the left-right direction, which is the extension direction of the tip portion of each external terminal 65, so that the relative displacement of the cover member 80 in the left-right direction with respect to the bobbin portion 30 is restricted. Therefore, it is possible to easily realize and maintain a state in which each external terminal 65 protrudes substantially uniformly outward from the outline. Furthermore, when setting the left-right dimensions of each external terminal 65, there is no need to take into account the relative displacement of the cover member 80 with respect to the bobbin portion 30 in the left-right direction, so the overall external dimensions of the coil component 100, including the external terminals 65, can be set smaller. In this embodiment, as an example, each of the dimensions W1 to W4 is the length dimension in the left-right direction from the right side surface of the second fixing tape 95 to the tip surface of each of the external terminals 65 of the first terminal portion 61 to the third terminal portion 63, and each of the dimensions W4 and W5 is the length dimension in the left-right direction from the left side surface of the second fixing tape 95 to the tip surface of each of the external terminals 65 of the fourth terminal portion 64.

[0041] Each of the first core member 11a and the second core member 11b is entirely formed integrally from a magnetic material. The bobbin portion 30 is, for example, entirely integrally molded from an insulating material such as resin. The cover member 80 is, for example, entirely formed as a single unit from an insulating material such as resin.

[0042] 3 and 8, for example, one of the cover member 80 and the bobbin portion 30 has a spring piece 83, and the other of the cover member 80 and the bobbin portion 30 has a convex portion 46 and a concave portion 47. In the case of the present embodiment, as an example, the cover member 80 has the spring piece 83, and the bobbin portion 30 has the convex portion 46 and the concave portion 47. More specifically, in this embodiment, the spring piece 83 is pressed by the protrusion 46, so that the spring piece 83 is elastically deformed in the second direction, and the spring piece 83 elastically biases the bobbin portion 30 in the first direction.

[0043] 3, the bobbin portion 30 has, for example, a first side surface 45 disposed along the first wall portion 82a and a second side surface 48 disposed along the second wall portion 82b. At least one of the first wall portion 82a and the first side surface 45 has a spring piece 83, and at least the other of the first wall portion 82a and the first side surface 45 has a protrusion 46 and a recess 47. Furthermore, the second side surface 48 and the second wall portion 82b are each formed flat and are in surface contact with each other. More specifically, in the present embodiment, when the cover member 80 is inserted onto the bobbin portion 30, at least one of the cover member 80 and the bobbin portion 30 elastically urges the other in the first direction (leftward) by the urging force of the spring piece 83, and the second side surface 48 and the second wall portion 82b come into surface contact with each other, so that the coil component 100 is configured. Therefore, the positioning of the cover member 80 with respect to the bobbin portion 30 can be easily performed without using a dedicated jig. Moreover, since the state in which the second side surface 48 and the second wall portion 82b are in surface contact with each other is well maintained, the relative displacement of the cover member 80 with respect to the bobbin portion 30 around the Z axis and around the Y axis can also be restricted. Therefore, it is easier to realize and maintain a state in which the above-mentioned dimensions W1 to W4 are equal to each other, and the above-mentioned dimensions W5 and W6 are equal to each other. Moreover, when setting the dimensions of each external terminal 65 in the left-right direction, the above-mentioned configuration can be easily realized by taking into consideration the dimension from the second side surface 48 to the tip surface of each external terminal 65 of the first terminal portion 61 to the third terminal portion 63 and the dimension from the second side surface 48 to the tip surface of each external terminal 65 of the fourth terminal portion 64. Therefore, the overall outside dimensions of the coil component 100 including the external terminals 65 can be set even smaller.

[0044] More specifically, in this embodiment, the first wall portion 82a of the cover member 80 has a spring piece 83, and the first side surface 45 of the bobbin portion 30 has a protrusion 46 and a recess 47. As shown in FIG. 3, in this embodiment, the first side surface 45 is formed by the right side surface of the first flange portion 41. The second side surface 48 is formed by, for example, the left side surface of the second flange portion 42. Therefore, the first side surface 45 (reference surface 49 described below) is perpendicular to the first direction (left-right direction in this embodiment). On the other hand, the second side surface 48 is perpendicular to the first direction (left-right direction in this embodiment). The first side surface 45 is disposed facing to the right, and the second side surface 48 is disposed facing to the left. Moreover, the first side surface 45 is disposed to the left of the spring piece 83. Moreover, the biasing direction of the spring piece 83 is to the left (first direction), which coincides with the direction in which the second side surface 48 faces. Therefore, the second side surface 48 is biased to the left (towards the second wall portion 82b) by the spring piece 83 and is brought into good contact with the inner surface of the second wall portion 82b.

[0045] As shown in FIG. 8, in this embodiment, the spring piece 83 is formed by a part of the first wall portion 82a. The extension direction of the spring piece 83 is downward. In other words, the spring piece 83 is formed by extending downward from the upper edge of the through hole 88a formed in the first wall portion 82a. That is, the upper end portion of the spring piece 83 constitutes one end portion 83a, and the upper end portion is supported by the first wall portion 82a. More specifically, the upper end portion of the spring piece 83 is a fixed end, and the lower end portion of the spring piece 83 is a free end, and the lower end portion constitutes the tip portion 83c. In the following description, the portion of the first wall portion 82a other than the spring piece 83 will be referred to as a main portion 821a. In this embodiment, the spring piece 83 may be disposed at least along the first side surface 45. Therefore, for example, the spring piece 83 may be formed by a part of the top surface portion 81 and a part of the first wall portion 82a.

[0046] As shown in Figs. 1, 2 and 8, the spring pieces 83 are formed at the front and rear of the first wall portion 82a, for example, in the front-rear direction, so as to sandwich the through hole 36 of the bobbin portion 30 therebetween. In other words, the through hole 36 is disposed between the front spring piece 83 and the rear spring piece 83. In this way, the two spring pieces 83 are formed side by side in the front-rear direction, i.e., in the direction perpendicular to the first direction, so that a structure can be realized in which the spring pieces 83 elastically bias the first side surface 45 in the first direction more satisfactorily, and the front and rear sides of the bobbin portion 30 can be pressed in a well-balanced manner, so that the relative displacement of the cover member 80 with respect to the bobbin portion 30 around the Z axis and the X axis can also be restricted. The spring pieces 83 extend, for example, parallel to each other. Each spring piece 83 is, for example, a leaf spring formed in a substantially flat plate shape. The shape of each spring piece 83 as viewed in the first direction (left-right direction) is, for example, a generally rectangular shape that is elongated in the vertical direction. The thickness of each spring piece 83 is generally constant regardless of the position in the vertical direction, and is set to be equal to the thickness of the first wall portion 82a. As shown in FIG. 6, the spring piece 83 is bent convexly in the second direction (rightward) and is also bent convexly in the first direction (leftward). More specifically, each spring piece 83 includes, for example, an end portion 83a whose upper end is supported by the main portion 821a of the first wall portion 82a, and a tip portion 83c connected to the lower end of the end portion 83a. The tip portion 83c includes an intermediate portion 832 connected to the end portion 83a, and a tip end portion 833 connected to the intermediate portion 832. One end 83a extends downward from the upper edge of the through hole 88a, and the middle portion 832 is bent downward from the lower edge of the one end 83a so that the amount of displacement to the left increases. The most distal portion 833 extends downward from the lower edge of the middle portion 832. More specifically, the boundary between the outer surface of the one end portion 83a and the outer surface of the intermediate portion 832 protrudes outward from the outer surface of the first wall portion 82a. Also, it is preferable that the boundary between the inner surface 831b of the intermediate portion 832 and the inner surface 831c of the most distal portion 833 protrudes inward from the inner surface of the first wall portion 82a. In the present embodiment, as described above, a gap is formed between the inner surface 12c of the base 12 of the first core member 11a and the outer surface of the first wall 82a (see FIG. 4). This prevents the spring piece 83 and the base 12 from interfering with each other even if a portion of the spring piece 83 protrudes outward (to the right) beyond the outer surface of the first wall 82a.

[0047] Each spring piece 83 is, for example, integrally molded with the cover member 80. Therefore, the spring pieces 83 are made of the same type of resin material as the resin material from which the cover member 80 is made. However, the spring piece 83 may be incorporated into the cover member 80 by, for example, insert molding. In this case, the spring piece 83 is made of metal. Also, the spring piece 83 may be molded separately from the cover member 80 and fixed to the cover member 80 by, for example, an adhesive or the like. In this case, the spring piece 83 may be made of the same type of resin material as the resin material constituting the cover member 80, or may be made of another material such as metal.

[0048] 1 and 2, the convex portion 46 and the concave portion 47 are formed on the first side surface 45 (the right side surface of the first flange portion 41) at locations corresponding to the pair of spring pieces 83. Therefore, as an example, the convex portion 46 and the concave portion 47 are formed on the front and rear portions of the first side surface 45 with the through hole 36 therebetween. In other words, the through hole 36 is disposed between the front convex portion 46 and the concave portion 47 and the rear convex portion 46 and the concave portion 47.

[0049] Here, it is preferable that at least a portion of the protrusion 46 is inclined in a direction in which the elastic restoring force of the spring piece 83 increases toward the direction of extrapolation of the cover member 80 relative to the bobbin part 30. As shown in Fig. 6, in the case of this embodiment, as an example, the protrusion amount of the protrusion 46 in the second direction (rightward) increases downward.

[0050] Furthermore, it is preferable that the amount of protrusion of the convex portion 46 toward the spring piece 83 side is greatest at the end portion 46b on the concave portion 47 side. This ensures a sufficient force for the spring piece 83 to press the end 46b, and the state in which the tip 83c is engaged with the end 46b can be maintained in a good condition. Therefore, the state in which the cover member 80 urges the bobbin part 30 upward can be maintained in a good condition, and thus the bobbin part 30 can be prevented from falling off the cover member 80 more reliably.

[0051] In this embodiment, as shown in FIG. 6, in addition to each of the convex portions 46 and the concave portions 47, the first side surface 45 further has a pair of front and rear guide portions 45b arranged on the upper side of each of the convex portions 46, and a reference surface 49 which is the portion of the first side surface 45 other than the convex portions 46, the concave portions 47, and the guide portions 45b. 3, 6, and 9(b), the recesses 47 are recessed further to the left than the protrusions 46. More specifically, each recess 47 is disposed flush with the reference plane 49 and forms a flat surface perpendicular to the first direction. The lower edge of each recess 47 is connected to the left edge of the upper surface of the first terminal holding portion 52. The protrusion 46 protrudes from the recess 47 to the right (toward the first wall 82a). More specifically, the protrusion 46 has, for example, an inclined surface that is inclined downward and displaced to the right, and a step surface 46a that is the boundary with the recess 47. In the case of this embodiment, the lower edge of the inclined surface of the protrusion 46 is the end 46b. The step surface 46a is disposed across the end 46b and the upper edge of the recess 47. The upper edge of each protrusion 46 is connected to the lower edge of the corresponding guide portion 45b, and the left edge of the step surface 46a is connected to the upper edge of the corresponding recess 47. In this embodiment, the step surface 46a is formed flat and disposed horizontally. The left-right dimension of the step surface 46a (height difference between the protrusion 46 and the recess 47) is approximately constant regardless of the position of the step surface 46a in the width direction (front-rear direction). The inclined surface of the protrusion 46 is inclined in a direction in which a plane perpendicular to the left-right direction is displaced downward and to the right around an axis extending in the front-rear direction. Therefore, in the inclined surface, if the positions of the portions in the up-down direction are the same, the amount of protrusion to the right (the amount of protrusion based on the recess 47) is the same regardless of the position in the width direction (front-rear direction). It should be noted that the present invention is not limited to this example. For example, the protrusion 46 may not have an inclined surface, and the outer surface of the protrusion 46 may be a flat surface perpendicular to the first direction. The pair of front and rear guide portions 45b are recessed to the left from the reference surface 49. More specifically, the pair of front and rear guide portions 45b each have a tapered recess amount that increases upward. The front guide portion 45b is formed continuously with the front convex portion 46, and the rear guide portion 45b is formed continuously with the rear convex portion 46. Each guide portion 45b is formed, for example, from the upper end surface of the first flange portion 41 to the upper edge of the convex portion 46. In addition, at the upper end of the first flange portion 41, in the central portion in the front-to-rear direction, a cutout-shaped portion 45a (see Figures 9(a) and 9(c)) that is open upward and toward the left and right is formed, and the front guide portion 45b is positioned forward of the cutout-shaped portion 45a, and the rear guide portion 45b is positioned rearward of the cutout-shaped portion. Here, in the case of this embodiment, the inclination angle of the guide portion 45b with respect to the reference plane 49 and the inclination angle of the convex portion 46 with respect to the reference plane 49 are set to be equal to each other, and the inclined surface of the guide portion 45b and the inclined surface of the convex portion 46 are arranged on the extension of each other. In other words, the inclined surface of the guide portion 45b and the inclined surface of the convex portion 46 are arranged flush with each other (see FIG. 6 and FIG. 9(b)). Also, the width dimension (front-rear dimension) of the guide portion 45b and the front-rear dimension of the convex portion 46 are set to be equal to each other. Therefore, the inclined surface including the guide portion 45b and the inclined surface of the convex portion 46 is a series of inclined surfaces (with a constant inclination angle) that are long in the vertical direction. The inclination angle of the inclined surface including the guide portion 45b and the inclined surface of the convex portion 46 may change in a curved shape in a quadratic curve state.

[0052] In the present embodiment, when the cover member 80 is fitted onto the bobbin portion 30, the spring pieces 83 are pressed to the right by the protrusions 46 and sway while being elastically deformed in the second direction. More specifically, the tip ends 83c of the pair of spring pieces 83 are guided to the protrusions 46 along the corresponding guide portions 45b, and then slide downward along the inclined surface of the protrusions 46 while storing spring force. When the spring pieces 83 overcome the end portions 46b of the protrusions 46 on the recessed portion 47 side, the spring pieces 83 are in a state of being elastically deformed to the maximum. Thereafter, while releasing a part of the spring force of the spring pieces 83 (while being elastically restored), the entry portion 84b of the tip end 83c falls into the recessed portion 47, and the tip end 83c of the spring pieces 83 is engaged with the protrusions 46. In this manner, in the case of this embodiment, the spring piece 83 is engaged with the protrusion 46 in a state in which the spring piece 83 has some reserve force (a state in which the amount of elastic deformation is less than that in a state in which the spring piece 83 is elastically deformed to the maximum), so that a structure can be achieved in which creep is unlikely to occur in the resin material constituting the spring piece 83. Therefore, the spring characteristics of the spring piece 83 can be favorably maintained. Also, since the amount of elastic deformation of the spring piece 83 in the second direction (rightward) is smaller than when the spring piece 83 is engaged with the protrusion 46 in a state in which the spring piece 83 is elastically deformed to the maximum, the left-right dimension of the cover member 80 can be reduced. Furthermore, when attempting to pull the cover member 80 upward from the bobbin portion 30, the spring piece 83 must again climb over the end portion 46b of the protrusion 46, and so swings while elastically deforming in the second direction. Therefore, even if the spring force of the spring piece 83 has weakened, it is expected that the spring piece 83 can fully exert its spring force at this time, and therefore pulling out of the cover member 80 from the bobbin portion 30 is suppressed.

[0053] Furthermore, as shown in FIG. 6, it is preferable that the entrance portion 84b is not in contact with the other part (the bobbin portion 30 in this embodiment). This ensures that the spring piece 83 has sufficient force to push the end 46b of the convex portion 46 upward, thereby more reliably preventing the bobbin portion 30 from falling off the cover member 80 and maintaining the underside of the flange portion 86 in surface contact (pressure contact) with the bobbin portion 30.

[0054] Moreover, the contact portion 84a preferably makes line contact or point contact with the other portion (the bobbin portion 30 in this embodiment). This makes it possible to reduce the area where the contact portion 84a (spring piece 83) contacts the bobbin portion 30. Therefore, regardless of the size or inclination angle of the portion of the bobbin portion 30 that contacts the contact portion 84a, the spring piece 83 can be positioned properly (at the intended position) with respect to the bobbin portion 30. However, the contact portion 84a may be in surface contact, for example. In this case, for example, it is preferable that the height dimension (vertical dimension) of the contact portion 84a is smaller than the width dimension (front-rear dimension). When the height dimension of the contact portion 84a becomes smaller than the width dimension, the contact portion 84a becomes in line contact. In other words, when the contact portion 84a is in line contact with the bobbin portion 30, it means that the height dimension of the contact portion 84a is significantly smaller than the width dimension.

[0055] Furthermore, it is more preferable that a portion 83b of the spring piece 83 on the base end side relative to the contact portion 84a is spaced apart from the other side (the bobbin portion 30 in this embodiment). This makes it possible to reduce the area where the contact portion 84a (spring piece 83) contacts the bobbin portion 30. Therefore, regardless of the size or inclination angle of the part of the bobbin portion 30 that contacts the contact portion 84a, the spring piece 83 can be positioned properly (at the intended position) with respect to the bobbin portion 30.

[0056] 6, in this embodiment, a portion of the inner surface 831b of the intermediate portion 832 serves as a contact portion 84a in contact with the protrusion 46. The contact portion 84a is in line contact along the front-rear direction with, for example, the end portion 46b (the right edge of the step surface 46a) of the protrusion 46 on the recess 47 side. In this embodiment, the portion of the tip portion 83c that is lower (the tip side) than the contact portion 84a and on the first direction side than the contact portion 84a serves as an entry portion 84b. More specifically, the intermediate portion 832 is inclined in a direction displacing, for example, to the right as it faces upward. Therefore, as the spring piece 83 elastically biases the bobbin portion 30, a force acts to push the end portion 46b of the protrusion 46 on the recess 47 side in an upward and leftward direction. The most distal end portion 833 is inclined in a direction displacing downward to the right, for example. In addition, the boundary between the inner surface 831b of the intermediate portion 832 and the inner surface 831c of the most distal end portion 833 is disposed to the left (first direction side) of the right edge of the step surface 46a. More specifically, the part of the inner surface 831b below the contact portion 84a and the inner surface 831c (entry portion 84b) of the most distal end portion 833 are disposed to the left of the right edge of the step surface 46a, respectively, and the outer surface of the intermediate portion 832 and the outer surface of the most distal end portion 833 are disposed to the right of the right edge of the step surface 46a. In addition, the part of the tip portion 83c below the contact portion 84a is not in contact with the recess 47. In this embodiment, the portion of the inner surface 831b of the intermediate portion 832 below (toward the tip) the contact portion 84a and the inner surface 831c of the most distal portion 833 are each located to the left (toward the first direction) of the contact portion 84a and extend into the recess 47. However, the entire inner surface 831c of the most distal end portion 833 does not necessarily have to be on the left side of the contact portion 84a, and for example, a part of the inner surface 831c may be located on the right side of the right edge of the step surface 46a. Also, the spring piece 83 does not necessarily have to have the most distal end portion 833.

[0057] Here, Fig. 7 shows a state before the cover member 80 is fitted onto the bobbin portion 30, that is, a state in which no external force is acting on the spring piece 83. In Fig. 7, for the sake of convenience, the convex portion 46 and the concave portion 47 are each indicated by a two-dot chain line. 7, before the cover member 80 is fitted onto the bobbin portion 30, the outer surface and the inner surface of the one end portion 83a are, for example, perpendicular to the left-right direction. Also, the outer surface of the one end portion 83a is, for example, flush with the outer surface of the main portion 821a, and the inner surface of the one end portion 83a is, for example, flush with the inner surface of the main portion 821a. Similarly, before the cover member 80 is extrapolated onto the bobbin portion 30, the outer surface and the inner surface 831c of the foremost portion 833 are, for example, perpendicular to the left-right direction. However, the outer surface of the foremost portion 833 is located more inward than the outer surface of the main portion 821a, and the inner surface 831c of the foremost portion 833 is located more inward than the inner surface of the main portion 821a. Furthermore, before the cover member 80 is extrapolated onto the bobbin portion 30, for example, the outer surface of the intermediate portion 832 is positioned more inward than the outer surface of the main portion 821a, and the inner surface 831b of the intermediate portion 832 is positioned more inward than the inner surface of the main portion 821a. Therefore, before the cover member 80 is inserted into the bobbin portion 30, a portion of the spring piece 83 (for example, the middle portion 832 and the most distal end portion 833) is located on the first direction side of the main portion 821a. More specifically, as shown in Fig. 7, a portion of the spring piece 83 (an inner surface 831b of the middle portion 832 and an inner surface 831c of the most distal end portion 833) is located on the left side of the right edge of the step surface 46a. As a result, even if there is manufacturing variation in the dimensions of the bobbin portion 30 in the first direction, the spring piece 83 will be in stable contact with the protrusion 46, so that the cover member 80 can elastically bias the first side 45 (bobbin portion 30) well.

[0058] 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.

[0059] The coil device 100 can be assembled, for example, as follows. First, each winding 71 of the coil 70 (first coil and second coil) is wound around the tubular portion 31 of the bobbin portion 30. Each end of the winding 71 is wound around a winding terminal (not shown) of the corresponding terminal portion 60, and fixed by welding or soldering. Next, the cover member 80 is placed over the bobbin portion 30 from above. At this time, for example, the tip portion 83c of the spring piece 83 is first placed in the corresponding guide portion 45b of the first side surface 45. Then, when the cover member 80 is pressed downwardly onto the bobbin portion 30, the entry portion 84b of the spring piece 83 elastically deforms while sliding downwardly along the inclined surface of the guide portion 45b and the inclined surface of the protruding portion 46, so that the protruding portion 46 receives a biasing force from the spring piece 83, and the inner surface of the second wall portion 82b comes into surface contact with the second side surface 48. Then, when the entry portion 84b overcomes the end portion 46b of the protruding portion 46, the spring piece 83 elastically restores, and during this elastic restoration, the bobbin portion 30 is pushed up relative to the cover member 80 by the spring force of the spring piece 83, and the lower surface of the flange portion 86 is pressed against (comes into surface contact with) the bobbin portion 30. In this manner, the cover member 80 is fitted onto the bobbin portion 30. However, for example, when the cover member 80 is placed over the bobbin portion 30 from above, the cover member 80 may be pressed downward onto the bobbin portion 30 until the lower surface of the flange portion 86 comes into surface contact with the bobbin portion 30. Next, the core portion 15 of the first core member 11a is inserted into the through hole 36 through the through hole 88a, while the core portion 15 of the second core member 11b is inserted into the through hole 36 through the through hole 88b. Next, the first fixing tape 90 is wound around the magnetic core 10 at least one turn. This makes it possible to fix the magnetic core 10 to the cover member 80 and the bobbin portion 30. Furthermore, the second fixing tape 95 is wound around both the first fixing tape 90 and the second side peripheral wall portion 85 of the cover member 80 at least one turn (see FIGS. 4 and 6). This makes it possible to more reliably fix the magnetic core 10 to the cover member 80 and the bobbin portion 30. In this manner, the coil component 100 is obtained.

[0060] As described above, it is preferable that at least a portion of the protrusion 46 is inclined toward the direction in which the cover member 80 is inserted relative to the bobbin portion 30 so that the elastic restoring force of the spring piece 83 increases. This allows the amount of elastic deformation of the spring piece 83 to be smoothly increased in the direction of extrapolation of the cover member 80 relative to the bobbin portion 30 when the cover member 80 is pressed downward relative to the bobbin portion 30. Moreover, as described above, the spring piece 83 has a cantilever structure in which the upper end portion (one end portion 83a) of the spring piece 83 in the direction of extrapolation of the cover member 80 relative to the bobbin portion 30 is supported. Therefore, in the case where the amount of protrusion of the convex portion 46 in the second direction increases in the direction of extrapolation (downward) as in this embodiment, the spring piece 83 can be smoothly elastically deformed along the shape of the convex portion 46.

[0061] Although the embodiments have been described above with reference to the drawings, these are merely examples of the present invention, and various configurations other than those described above can also be adopted.

[0062] For example, in the above description, an example has been described in which the cover member 80 elastically biases the bobbin portion 30, but the present invention is not limited to this example, and the bobbin portion 30 may elastically bias the cover member 80. In other words, the bobbin portion 30 may be elastically deformed, and the bobbin portion 30 may elastically bias the cover member 80 by its elastic restoring force. In this case, for example, the bobbin portion 30 may have a spring piece 83 that elastically biases the cover member 80, and the cover member 80 may have a protrusion 46 and a recess 47 that is recessed toward the first direction side from the protrusion 46. In this case, for example, the right direction is the first direction, and the left direction is the opposite direction to the first direction (second direction). Furthermore, in the present invention, the cover member 80 may elastically bias the bobbin portion 30, and the bobbin portion 30 may elastically bias the cover member 80. That is, the cover member 80 may be elastically deformed, and the cover member 80 may elastically bias the bobbin portion 30 by its elastic restoring force, and the bobbin portion 30 may be elastically deformed, and the bobbin portion 30 may elastically bias the cover member 80 by its elastic restoring force. In this case, the direction in which the cover member 80 elastically biases the bobbin portion 30 and the direction in which the bobbin portion 30 elastically biases the cover member 80 may be parallel to the mounting surface and may be different from each other (for example, perpendicular to each other). In other words, for example, the cover member 80 may elastically bias the bobbin portion 30 in a first direction, and the bobbin portion 30 may elastically bias the cover member 80 in a second direction. Also, the cover member 80 may elastically bias the bobbin portion 30 toward the first direction, and the bobbin portion 30 may elastically bias the cover member 80 toward the second direction, or vice versa.

[0063] In addition, in the above, an example has been described in which the cover member 80 elastically biases the bobbin portion 30 in the first direction, but the present invention is not limited to this example, and the cover member 80 may elastically bias the bobbin portion 30 in both the first direction and the second direction. More specifically, for example, the cover member 80 may have spring pieces 83 on both the first direction side (first wall portion 82a) and the second direction side (second wall portion 82b) that elastically bias the bobbin part 30. In this case, it is preferable that the protrusions 46 and the recesses 47 are formed on both the first side surface 45 and the second side surface 48 of the bobbin part 30, respectively. In this way, the spring piece 83 on the first direction side exerts a force to push the bobbin part 30 upward to the left, and the spring piece 83 on the second direction side exerts a force to push the bobbin part 30 upward to the right. The leftward force of the spring piece 83 on the first direction side and the rightward force of the spring piece 83 on the second direction side cancel each other out, while the upward forces of the spring piece 83 on the first direction side and the spring piece 83 on the second direction side are added together, and the resultant force of each spring piece 83 is substantially directly upward. As a result, the rotational forces around the Y-axis by the spring piece 83 are canceled out, so that the inclination of the cover member 80 in the up-down direction can be suppressed. In this case, as described above, the bobbin portion 30 may also elastically bias the cover member 80. That is, the bobbin portion 30 may elastically bias the cover member 80 in both the first direction and the second direction.

[0064] Further, in the above, an example has been described in which the magnetic core 10 is configured to include two E cores, but the present invention is not limited to this example, and the magnetic core 10 may 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.

[0065] In the above, an example in which the magnetic core 10 has the core portion 15 has been described, but the magnetic core 10 may have a configuration without the core portion 15. That is, the magnetic core 10 may be configured with two core members each having a U-shape, or may be configured with a U-shaped core member and an I-shaped core member. In this case, the overall shape of the magnetic core 10 is a rectangular ring shape in a plan view.

[0066] In addition, in the above, an example has been described in which the magnetic core 10 has two components (first core member 11a and second core member 11b), but the magnetic core 10 may be a one-piece whole, or may be composed of three or more components.

[0067] In the above, an example in which the extension direction of the spring piece 83 is downward has been described, but for example, the extension direction of the spring piece 83 may be upward. In this case, for example, the spring piece 83 is formed extending upward from the lower edge of the through hole 88a formed in the first wall portion 82a. That is, the upper end portion of the spring piece 83 may be a free end (forming the tip portion 83c), and the lower end portion of the spring piece 83 may be a fixed end (one end portion 83a).

[0068] The present embodiment encompasses the following technical ideas. (1) a bobbin portion; A magnetic core inserted through the bobbin portion; A coil wound around the bobbin portion; a cover member that is fitted onto the bobbin portion to cover the bobbin portion; A coil component comprising: At least one of the cover member and the bobbin portion has a spring piece that elastically biases the other of the cover member and the bobbin portion, the spring piece has a cantilever structure in which one end of the spring piece in a direction in which the cover member is inserted relative to the bobbin portion is supported and extends from the one end toward a tip of the spring piece, a biasing force of the spring piece causes at least one of the cover member and the bobbin portion to elastically bias the other in a first direction parallel to a mounting surface, At least the other of the cover member and the bobbin portion has a convex portion and a concave portion that is recessed toward the first direction side relative to the convex portion, the recess is adjacent to the protrusion on a side in an extension direction of the spring piece, a tip end portion of the spring piece has a contact portion that contacts the protruding portion and biases the protruding portion, and an entry portion that is located on the tip side of the contact portion and enters the recessed portion, A coil component in which the entry portion is located on the side of the contact portion in the first direction, and the spring piece is bent so that a force is generated at the contact point between the contact portion and the convex portion, causing the cover member to urge the bobbin portion upward. (2) The coil component according to (1), wherein the entry portion is in non-contact with the other portion. (3) A coil component as described in (1) or (2), wherein at least a portion of the convex portion is inclined toward the direction of extrapolation of the cover member onto the bobbin portion in a direction that increases the elastic restoring force of the spring piece. (4) The coil component according to (3), wherein the amount of protrusion of the convex portion toward one side of the spring is greatest at the end portion on the concave side. (5) The coil component according to any one of (1) to (4), wherein a portion of the spring piece on a base end side relative to the contact portion is spaced apart from the other of the spring pieces. (6) The coil component according to (5), wherein the contact portion is in line contact or point contact with the other. (7) One of the cover member and the bobbin portion has the spring piece, The coil component according to any one of (1) to (6), wherein the other of the cover member and the bobbin portion has the protrusion and the recess. (8) The cover member has a side peripheral wall portion including a first wall portion and a second wall portion opposed to each other, the bobbin portion has a first side surface disposed along the first wall portion; At least one of the first wall portion and the first side surface has the spring piece, At least the other of the first wall portion and the first side surface has the protrusion and the recess, the bobbin portion has a second side disposed along the second wall portion; The coil component according to any one of (1) to (6), wherein the second side surface and the second wall portion are each formed flat and are in surface contact with each other. (9) The cover member has a flange portion that protrudes outward from a lower end of the side peripheral wall portion, The coil component according to (8), wherein a lower surface of the flange portion is in surface contact with the bobbin portion. [Explanation of symbols]

[0069] 10 Magnetic core 11a First core member 11b Second core member 12 base 12c inner surface 12d External surface 13 External legs 15 core 30 Bobbin section 31 Cylinder part 32 Upper wall 33 Lower wall part 34 Front wall 35 Rear wall 36 Through hole 40 Flange 41 First flange 42 Second flange 45 First aspect 45a Notched part 45b Information Department 46 Convex 46a Step surface 46b End 47 Recess 48 Second aspect 49 Reference plane 50 Terminal holding part 52 1st terminal holding part 53 1st protrusion 55 2nd terminal holding part 56 2nd protrusion 59 Overhang 60 Terminal section 61 1st terminal section 62 2nd terminal section 62b Legs 63 3rd terminal section 64 4th terminal section 64a Connection 64b Legs 65 External terminal 70 Coil 70a 1st coil 70b Second coil 71 Windings 72 Winding section 80 Cover member 81 Top section 81a Projection 82 Side peripheral wall (first side peripheral wall) 82a 1st wall 821a Main section 82b 2nd wall section 82c 3rd wall section 82d 4th wall 83 Spring Piece 83a One end 83b part 831b Inside 83c Tip 831c Inside 832 Middle section 833 Cutting edge section 84 Tip 84a Contact part 84b Approach section 85 Second side peripheral wall part 85a 1st wall section 85b Second wall 85c 3rd wall section 85d 4th wall section 86 Flange part 86a Top side 88 Through hole (second through hole) 88a Through hole 88b Through hole 90 First Fixing Tape 95 Second Fixing Tape 100 Coil parts

Claims

1. A bobbin portion; A magnetic core inserted through the bobbin portion; A coil wound around the bobbin portion; a cover member that is fitted onto the bobbin portion to cover the bobbin portion; A coil component comprising: At least one of the cover member and the bobbin portion has a spring piece that elastically biases the other of the cover member and the bobbin portion, the spring piece has a cantilever structure in which one end of the spring piece in a direction in which the cover member is inserted relative to the bobbin portion is supported and extends from the one end toward a tip of the spring piece, Due to the biasing force of the spring piece, at least one of the cover member and the bobbin portion elastically biases the other in a first direction perpendicular to the direction of extrapolation, At least the other of the cover member and the bobbin portion has a convex portion and a concave portion that is recessed toward the first direction side relative to the convex portion, the recess is adjacent to the protrusion on a side in an extension direction of the spring piece, a tip end portion of the spring piece has a contact portion that contacts the protruding portion and biases the protruding portion, and an entry portion that is located on the tip side of the contact portion and enters the recessed portion, A coil component in which the entry portion is located on the side of the contact portion in the first direction, and the spring piece is bent so that a force is generated at the contact point between the contact portion and the convex portion, causing the cover member to urge the bobbin portion in a direction opposite to the direction of extrapolation.

2. The coil component according to claim 1 , wherein the entrance portion is in non-contact with the other portion.

3. 3 . The coil component according to claim 1 , wherein at least a portion of the protrusion is inclined toward the direction in which the cover member is inserted around the bobbin portion, in such a direction that the elastic restoring force of the spring piece increases.

4. The coil component according to claim 3 , wherein the amount of protrusion of the convex portion toward the spring side is greatest at the end portion on the concave side.

5. The coil component according to claim 1 , wherein a portion of the spring piece on a base end side relative to the contact portion is spaced apart from the other of the spring pieces.

6. The coil component according to claim 5 , wherein the contact portion is in line contact or point contact with the other of the contact portions.

7. one of the cover member and the bobbin portion has the spring piece, The coil component according to claim 1 , wherein the other of the cover member and the bobbin portion has the protrusion and the recess.

8. The cover member has a side peripheral wall portion including a first wall portion and a second wall portion opposed to each other, the bobbin portion has a first side disposed along the first wall portion; At least one of the first wall portion and the first side surface has the spring piece, At least the other of the first wall portion and the first side surface has the protrusion and the recess, the bobbin portion has a second side disposed along the second wall portion; The coil component according to claim 1 , wherein the second side surface and the second wall portion are each formed flat and are in surface contact with each other.

9. The cover member has a flange portion that protrudes outward from an end of the side peripheral wall portion in the direction of the extrapolation, The coil component according to claim 8 , wherein a lower surface of the flange portion is in surface contact with the bobbin portion.

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