Coil parts

Abstract

The cover (40) includes a top surface portion (42) and a leg portion (44). The top surface portion (42) covers the core (10) and the coil (20) from above. The leg portion (44) extends downward from the top surface portion (42) along the side surface of the core (10). The leg portion (44) has a claw portion (46). The claw portion (46) protrudes from a part of the leg portion (44) toward the core (10). The cover (40) is attached to the core (10) by engaging the claw portion (46) with the engaging portion (12) of the core (10). The core (10) has a recess (14) on the outer edge of the upper surface of the core (10). The recess (14) is formed by recessing the upper surface of the core (10) downward. An insertion portion (48) that is a part of the cover (40) is accommodated in the recess (14).

Description

[Technical field]

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

[0002] The coil component includes a coil component including a core formed in an annular shape, and the upper part of the core is covered with a cover. In relation to this type of technology, the following Patent Document 1 discloses a common choke coil (1) having a cover (60). In the common choke coil (1), a flat lid portion (61) of the cover (60) covers the upper part of the core (10). A convex portion (76) is formed on the back surface of the cover (60). The convex portion (76) abuts against the upper surface (first side surface (16)) of the core (10). The cover (60) also has legs (66, 67) with a locking claw (68) at the tip. The locking claw (68) engages with a locking receiving portion (27) of the core (10). 9 and 10 of Patent Document 1, a partition (78) is formed between the two protruding portions (76). A groove (24) is formed on the inner side of the flange (15) of the core (10) in the winding axis direction. The partition (78) is inserted into the groove (24). This is how the cover (60) is attached to the core (10). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-173201 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the core (10) in Patent Document 1 is formed in an annular shape. If a notch such as a groove is provided on the central side (inner edge side) of such an annular core, the notch affects the magnetic flux, resulting in a problem that the desired inductance cannot be obtained.

[0005] The present invention has been made in consideration of the above-mentioned problems, and provides a coil component that allows for easy positioning of a cover relative to a core while still providing a desired inductance. [Means for solving the problem]

[0006] The coil component of the present invention includes a core formed in an annular shape in a planar view, one or more coils wound around a part of the core with the extension direction of the part as the winding axis direction, a connection terminal electrically connected to the coil, and a cover disposed above the core and the coil. A coil component The cover includes a top surface portion covering the core and the coil from above, and a leg portion extending downward from the top surface portion along a side surface of the core and having a claw portion protruding toward the core, the cover is attached to the core by engaging the claw portion with an engaging portion of the core, and the core is formed with a recess downward on an outer edge of the upper surface of the core. and is bounded by the sides The cover has a recess, and an insertion portion that is a part of the cover is The side surface of the recess can restrict positional deviation of the insertion portion in the winding axis direction or the width direction of the coil component. It is characterized in that it is housed in the recess. Effect of the Invention

[0007] In an annular core, magnetic flux is concentrated on the inner edge side of the core. In the coil component of the present invention, a recess is formed on the outer edge of the upper surface of the annular core to accommodate the insertion portion of the cover. As a result, the effect of the recess on the magnetic flux generated in the core is smaller than when a recess or groove is formed on a part of the inner edge side of the annular core. On the other hand, the insertion portion, which is a part of the core, is received in a recess formed in the core, so that the cover can be positioned relative to the core when the cover is attached to the core. This makes it possible to provide a coil component that allows the cover to be easily positioned relative to the core while still providing a desired inductance. [Brief description of the drawings]

[0008] The above objects, as well as other objects, features and advantages, will become more apparent from the following preferred embodiments and the accompanying drawings.

[0009] [Figure 1] FIG. 1 is a perspective view showing an example of a coil component according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded perspective view of the coil component according to the first embodiment. [Diagram 3] FIG. 2 is a top view of the coil component according to the first embodiment. [Figure 4] FIG. 2 is a front view of the coil component according to the first embodiment. [Diagram 5] FIG. 2 is a bottom view of the coil component according to the first embodiment. [Figure 6] FIG. 2 is a right side view of the coil component according to the first embodiment. [Figure 7] 7 is a cross-sectional view taken along dashed line VII of a part of the front side of the coil component in FIG. 3, as viewed in the direction of arrows VII-VII. [Figure 8] 8 is a cross-sectional view taken along dashed line VIII of a part of the front side of the coil component in FIG. 7, as viewed in the direction of arrows VIII-VIII. [Figure 9] Fig. 9(a) is a cross-sectional view taken along dashed line IXa in Fig. 3, seen in the direction of arrow IXa-IXa. Specifically, the cross-section is located between the protruding end of the terminal protrusion and the bottom surface of the recessed groove in the front-rear direction. Fig. 9(b) is a cross-sectional view taken along dashed line IXb in Fig. 4, seen in the direction of arrow IXb-IXb. [Figure 10] FIG. 11 is a front view showing an example of a coil component according to a second embodiment of the present invention. [Figure 11] FIG. 11 is a top view of a coil component according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The various components of the coil component of the present invention do not need to be independent entities, and it is permitted that multiple components are formed as a single member, that one component is formed from multiple members, that one component is part of another component, that part of one component overlaps with part of another component, etc.

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, corresponding components are given the same reference numerals, and duplicated descriptions will be omitted as appropriate. In this embodiment, the front-rear, left-right, top-bottom directions are defined as shown in the drawings. However, this is defined for the sake of convenience in order to easily explain the relative relationships between components, and does not limit the directions during manufacture or use of a product embodying the present invention. In particular, the top-bottom direction in this embodiment is a direction perpendicular to the surface of the mounting board on which the coil component is mounted, and the direction approaching the mounting board in this direction is downward, and the direction opposite to the downward direction is upward. The top-bottom direction is not limited to the vertical direction. In this embodiment, the front-rear direction coincides with the winding axis direction described later. The left-right direction coincides with the width direction of the coil component. The top-bottom direction coincides with the thickness direction or height direction of the coil component. Further, the term "flat surface" as used in the present invention means a shape that is physically formed with a flat surface as a target, and it is not necessarily required that the surface be a geometrically perfect flat surface.

[0012] First Embodiment (Coil parts) FIG. 1 is a perspective view showing an example of a coil component 1 according to a first embodiment of the present invention.

[0013] First, an overview of a coil component 1 according to the present embodiment will be described. The coil component 1 has a core 10, one or more coils 20, one or more connection terminals 30, and a cover 40. The core 10 is formed in an annular shape in a plan view. The coil 20 is wound around a part of the core 10 with the extension direction of the part as the winding axis direction. The connection terminal 30 is electrically connected to the coil 20. The cover 40 is disposed above the core 10 and the coil 20. The cover 40 includes a top surface portion 42 and leg portions 44. The top surface portion 42 covers the core 10 and the coil 20 from above. The leg portions 44 extend downward from the top surface portion 42 along the side surfaces of the core 10. The leg portions 44 also have claw portions 46. The claw portions 46 protrude from parts of the leg portions 44 toward the core 10. The cover 40 is attached to the core 10 with the claw portions 46 engaging with the engagement portions 12 of the core 10. The core 10 has a recess 14 on the outer edge of the top surface of the core 10. The recess 14 is formed by depressing the top surface of the core 10 downward. An insertion portion 48, which is a part of the cover 40, is housed in the recess 14. In the annular core 10, magnetic flux is generated in a concentrated manner on the inner edge side of the core 10. In the coil component 1 having the above-described configuration, a recess 14 for accommodating the insertion portion 48 of the cover 40 is formed on the outer edge portion of the upper surface of the annular core 10. As a result, the recess 14 has a smaller effect on the magnetic flux generated in the core 10 than when a recess or groove portion is formed on part of the inner edge side of the annular core 10. This is because denser magnetic flux is generated on part of the inner edge side of the annular core 10 compared to part of the outer edge side. On the other hand, the insertion portion 48, which is a part of the core 10, is accommodated in the recess 14 formed in the core 10, so that the cover 40 can be positioned relative to the core 10 when the cover 40 is attached to the core 10. Specifically, in the assembly process of the coil component 1, when the cover 40 is attached from above the core 10, the insertion portion 48 of the cover 40 is first inserted into the recess 14 of the core 10, and when this insertion is performed, the claw portion 46 of the leg portion 44 engages with the engagement portion 12 of the core 10. When the claw portion 46 of the leg portion 44 engages with the engagement portion 12 of the core 10, the positional relationship between the cover 40 and the core 10 is fixed. Before the positional relationship between the cover 40 and the core 10 is fixed in this way, the insertion portion 48 of the cover 40 is inserted into the recess 14 of the core 10 to position the cover 40 relative to the core 10. This allows the cover 40 to be fixed at a desired position relative to the core 10. Furthermore, by accommodating insertion portion 48 in recess 14, cover 40 can be positioned relative to core 10 in the winding axis direction or the width direction of coil component 1, which will be described later. Being able to position cover 40 in the winding axis direction prevents cover 40 from shifting in the winding axis direction relative to core 10, which would otherwise cause the dimension of coil component 1 in the winding axis direction to unexpectedly increase. Also, being able to position cover 40 in the width direction of coil component 1 prevents damage or deformation of leg portions 44. This makes it possible to provide the coil component 1 that allows the cover 40 to be easily positioned relative to the core 10 while still providing a desired inductance.

[0014] Next, the coil device 1 of the present embodiment will be described in detail. The coil component 1 is a component that includes a coil 20 and can form part of an electronic circuit. Examples of the coil component 1 include an inductor including a common choke coil, a transformer, or an antenna. The coil component 1 is mounted on a mounting board by grounding a connection terminal, which will be described later, to the mounting board.

[0015] The coil component 1 has a core 10. The core 10 is a magnetic body formed by containing a magnetic material. As shown in Fig. 5, the core 10 has an annular shape when viewed from above. Here, the plan view refers to viewing the coil component 1 from either one of the upper or lower directions (particularly from above). The annular shape of the core 10 means that the magnetic material that forms the core 10 is formed so as to wrap around. Here, the shape of the core 10 when viewed from above may be circular (ring-shaped) or may be a rectangular annular shape as in this embodiment. In the coil component 1, a hollow portion 18 is formed on the center side of the annular shape of the core 10 (the inner side of the coil component 1). The annular core 10 may be integrally formed of only one magnetic body, or may be formed by combining a plurality of magnetic bodies. For example, the winding shaft portion 10a and the flange portion 10b, which will be described later, may be divided.

[0016] 2, the core 10 in this embodiment includes a winding shaft portion 10a and a flange portion 10b. The winding shaft portion 10a is a part of the core 10, and is a part around which a coil 20 (described later) is wound. The flange portion 10b is a part of the core 10, and is a part that suppresses loosening of the coil 20 wound around the winding shaft portion 10a. In this embodiment, in the core 10, which is rectangular and annular in plan view, one side of the rectangle and one side opposing (parallel to) the first side are the winding shaft portion 10a, and the other two sides are the flange portion 10b. That is, the winding shaft portion 10a is a part of the rectangular and annular core 10 that extends in the front-rear direction. The flange portion 10b is a part of the rectangular and annular core 10 that extends in the left-right direction. The flange portion 10b protrudes beyond the winding shaft portion 10a in at least one direction intersecting (orthogonal to) the extension direction (winding axis direction) of the winding shaft portion 10a. This allows the flange portion 10b to suppress loosening of the coil 20. Specifically, in this embodiment, as shown in FIG. 5, the flange portion 10b protrudes in both the left and right directions beyond one of the winding shaft portions 10a. Also, as shown in FIG. 6, the flange portion 10b protrudes downward beyond the winding shaft portion 10a. Meanwhile, as shown in FIG. 2, in this embodiment, the top surface of the winding shaft portion 10a and the top surface of the flange portion 10b are flush with each other.

[0017] The coil component 1 has one or more coils 20. In this embodiment, the coil component 1 has two coils 20. The coil 20 is a member formed of a conductive material. The coil 20 is wound around the winding shaft portion 10a of the core 10. Specifically, the coil 20 is wound around the winding shaft portion 10a with the winding axis extending in a predetermined direction (the front-to-rear direction in this embodiment). Hereinafter, the winding axis direction of the coil 20 may be simply referred to as the winding axis direction. The coil 20 wound around the core 10 includes not only a coil manufactured by winding a conductive material such as a coil wire around the core 10 as a winding core, but also a coil simply arranged in a spiral shape around the core 10 as a winding core. In other words, the coil 20 may be formed by forming a conductive material into a spiral shape in advance, and then inserting the core 10 as a winding core into the inside of the spiral.

[0018] In this embodiment, the coil 20 is formed of a coil wire made of a metal such as copper. As shown in Fig. 2, the coil 20 includes a winding portion 20a formed in a spiral shape, and an extraction portion 20b which is an end of the coil wire extracted from the winding portion 20a. The coil 20 is electrically connected at the extraction portion 20b to a connection portion 32 of a connection terminal 30 which will be described later.

[0019] 2, the connection terminals 30 are members that are electrically connected to the coils 20, and are members that are electrically connected to an electronic circuit on a mounting board when the coil component 1 is mounted on the mounting board. In this embodiment, the coil component 1 has four connection terminals 30. The four connection terminals 30 are respectively connected to both ends of the coil wires that form the two coils 20. The connection terminal 30 is made of a conductive material. The connection terminal 30 of this embodiment is formed by bending a flat conductive material (metal plate). Specifically, the connection terminal 30 includes a plurality of substantially plate-like portions (connection portions 32, standing portions 34, and mounting portions 36, which will be described later) and a bent portion located between the plurality of substantially plate-like portions and having a smaller radius of curvature than the plate-like portions.

[0020] As shown in FIG. 1, the connection terminal 30 is attached to one end of the core 10 in the winding axis direction. Specifically, the connection terminal 30 is attached to the flange portion 10b of the core 10. In this embodiment, the connection terminal 30 is fixed and attached to the core 10 with an adhesive. Specifically, an adhesive is disposed between an inner main surface 34b (see FIG. 2) of a rising portion 34 of the connection terminal 30, which will be described later, and the front or rear surface of the core 10. The adhesive may be disposed between other portions of the connection terminal 30 and the core 10. The connection terminal 30 may be attached to the core 10 by engagement, fitting, welding, or other methods other than adhesion.

[0021] As shown in FIG. 2, the connection terminal 30 includes a connection portion 32, a standing portion 34, and a mounting portion 36. The connection portion 32 is connected to one end (the lead-out portion 20b) of the coil 20 along the upper surface of the core 10. Specifically, the connection portion 32 and the lead-out portion 20b are joined by solder 50 as shown in FIG. 4. More specifically, the connection portion 32 includes a part along the upper surface of the core 10 and a crimped portion 32a extending crosswise to the part. The lead-out portion 20b is crimped by the crimped portion 32a and a part of the connection portion 32, and then joined to the connection portion 32 by the solder 50. In this embodiment, the lead-out portion 20b and the crimped portion 32a are embedded inside the solder 50, but are not limited thereto. A part of the lead-out portion 20b and a part of the crimped portion 32a (particularly the tip portion) may be exposed to the outside of the solder 50. 1, 2, and 6 to 11, the solder 50 is omitted. Also, in Fig. 3 and Fig. 4, the outline of the solder 50 is shown by a dotted line. Also, Figs. 1 to 3, 7, and 9(a) to 11 show the crimped portion 32a in a state before the drawn-out portion 20b is crimped. In this state, the crimped portion 32a stands upright in the vertical direction. The standing portion 34 continues from the connecting portion 32 and runs along the side surface (front or back surface) of the core 10. The standing portion 34 continuing from the connecting portion 32 means that the standing portion 34 and the connecting portion 32 are integrally formed, and the standing portion 34 is adjacent to the connecting portion 32 with the bent portion sandwiched therebetween. The mounting portion 36 continues from the standing portion 34 and runs along the bottom surface of the core 10. The mounting portion 36 continues from the standing portion 34 means that the mounting portion 36 and the standing portion 34 are integrally formed and the mounting portion 36 is adjacent to the standing portion 34 with the bent portion sandwiched between them. The mounting portion 36 is a part of the connection terminal 30 that connects to the mounting board. Specifically, since the mounting portion 36 is located at the bottom end of the coil component 1, when the coil component 1 is placed on the mounting board, the connection terminal 30 (mounting portion 36) can be electrically connected to an electronic circuit on the mounting board.

[0022] The cover 40 is a member disposed above at least a portion of the core 10 and at least a portion of the coil 20 in the coil component 1. The cover 40 protects the core 10 and the coil 20. In addition, since the cover 40 has a flat top surface portion described below, the coil component 1 can be adsorbed and moved by a mounter. In this embodiment, the cover 40 is made of resin. The cover 40 includes a top surface portion 42. The top surface portion 42 is a member that covers the coil 20 and the core 10 from above. In other words, at least a portion of the top surface portion 42 overlaps with at least a portion of the coil 20 and at least a portion of the core 10 in the up-down direction.

[0023] Cover 40 includes legs 44. Legs 44 extend downward from top surface 42. In this embodiment, legs 44 (hanging portions 47) are plate-like members. Specifically, the thickness dimension of plate-like legs 44, i.e., the dimension of legs 44 (hanging portions 47) in the left-right direction (also width dimension L3, described below), is smaller than the dimensions of legs 44 (hanging portions 47) in the front-rear and up-down directions. This allows legs 44 (particularly hanging portions 47) to bend in the left-right direction. In this embodiment, a notch, which will be described later, is formed in the top surface portion 42. The leg portion 44 extends downward from the position where the notch is formed in the top surface portion 42. Since the notch 41 is formed in the base end of the leg portion 44 in this manner, the flexibility of the leg portion 44 is ensured. In this embodiment, the side portion 45 extends downward from the center of the top surface portion 42 in the front-rear direction. The leg portion 44 is formed at the end of the side portion 45 in the front-rear direction. Therefore, in the process of attaching the cover 40 to the core 10, the side portion 45 twists and the leg portion 44 spreads outward in the left-right direction. In this embodiment, the legs 44 are formed integrally with the top surface 42 and are arranged along the side surfaces of the core 10. In this embodiment, the cover 40 includes four legs 44. The four legs are arranged along the front end and rear end of the left and right sides of the core 10 (the flange 10b). In other words, each of the front end and rear end (the front flange 10b and the rear flange 10b) of the core 10 is sandwiched by a pair of legs 44, 44. Here, the pair of legs 44 may hold the core 10 in the left-right direction. In other words, the legs 44 may bias the core 10 inward in the left-right direction. Alternatively, the legs 44 may be spaced apart from the core 10 in the left-right direction, or may simply be in contact with the core 10. Furthermore, leg portion 44 has claw portion 46. Claw portion 46 protrudes from a part of leg portion 44 toward core 10. Specifically, leg portion 44 has a hanging portion 47 extending downward from top surface portion 42. Claw portion 46 is a part of leg portion 44, and is a part that protrudes from hanging portion 47 toward core 10. In this embodiment, claw portion 46 protrudes inward in the left-right direction toward the left or right side surface of core 10. In this embodiment, the claw portion 46 is formed at the tip portion of the hanging portion 47, but the claw portion 46 may be formed at the middle portion of the hanging portion 47 in the up-down direction.

[0024] The claw portion 46 (the tip of the leg portion 44 including the claw portion 46) engages with a part of the core 10 (the engagement portion 12). Specifically, the side surface (left side surface or right side surface) of the core 10 is recessed in the protruding direction of the claw portion 46 (inward in the left-right direction), and the engagement portion 12 is formed on the side surface of the core 10. The engagement portion 12 is a part with which the claw portion 46 engages. In this embodiment, the engagement portion 12 is a notch recessed and formed in the side surface of the core 10, and in particular, the surface of the notch that faces downward. The claw portion 46 is arranged to overlap the engagement portion 12 in the vertical direction, and the claw portion 46 engages with the engagement portion 12. However, here, the claw portions 46 engaging with the engaging portions 12 of the core 10 is not limited to a state in which the claw portions 46 are always in contact with and hooked onto the engaging portions 12. The claw portions 46 may be separated from the engaging portions 12 of the core 10 in a natural state, as described below. Furthermore, when the cover 40 is gripped, lifted upward, or the like, to lift the coil component 1, the claw portions 46 may be in contact with and hooked onto the engaging portions 12.

[0025] As shown in FIG. 1, in this embodiment, a notch 41 recessed inward (rearward or forward) in the winding axis direction is formed at an end (front end or rear end) of a top surface portion 42 in the winding axis direction. In this embodiment, the notch 41 is formed in the top surface portion 42 in the left-right direction from the base end of the leg portion 44 to the center of the top surface portion 42. Moreover, the depth (dimension in the front-rear direction) of the notch 41 in this embodiment is greater than the dimension in the front-rear direction of the leg portion 44. That is, the notch 41 is formed by cutting out the top surface portion 42 further toward the center than the leg portion 44 in the front-rear direction.

[0026] 1, a recess 14 is formed in the core 10. The recess 14 is a space (hollow portion) in which an insertion portion 48, which will be described later, is accommodated. The recess 14 is formed by recessing downward the outer edge of the upper surface of the core 10. The outer edge of the upper surface of the core 10 is a portion near the outer edge of the upper surface of the annular core 10. More specifically, the outer edge of the upper surface of the core 10 is a part of the upper surface of the annular core 10 on the outer edge side relative to the center between the outer edge and inner edge of the annular core 10. The recess 14 in this embodiment is formed at a corner of the core 10 (a corner where the upper surface and side surface of the core 10 intersect) in the outer edge. Specifically, as described in detail later, the recess 14 in this embodiment is a recess formed at a corner of the core 10 and open upward and laterally. In other words, the recess 14 is defined by side surfaces capable of restricting the positional deviation of the insertion portion 48 described later in at least one of the front-rear direction and at least one of the left-right direction. In this embodiment, the recess 14 is defined by a first side surface 14a and a second side surface 14b described later. The first side surface 14a can restrict the positional deviation of the insertion portion 48 inward (forward or backward) in the winding axis direction. In addition, the second side surface 14b can restrict the positional deviation of the insertion portion 48 in each of the left-right directions. Alternatively, the recess 14 may be formed in the outer edge portion at a position slightly closer to the inner edge than the outer edge of the upper surface of the core 10. In other words, the recess 14 may be a space that is open only upward and is surrounded on all sides by the core 10.

[0027] As shown in Fig. 8, in this embodiment, the recesses 14 are not formed up to the inner edge of the annular core 10. More specifically, the recesses 14 are not formed on the inner edge portion 11 of the annular core 10. Also, in this embodiment, the dimension L10 of the recesses 14 in the winding axis direction (front-rear direction) is half or less of the dimension L11 in the radial direction of the annular core 10 (the dimension of the flange portion 10b in the front-rear direction in this embodiment). This makes it easier to obtain the desired inductance because the effect of the recesses 14 on the magnetic flux generated at the inner edge portion 11 of the core 10 is small.

[0028] 4, the depth dimension of recess 14 (the dimension of recess 14 in the vertical direction) is equal to or less than half the dimension of core 10 (flange portion 10b) in the vertical direction. Preferably, the depth dimension of recess 14 is equal to or less than one-third the dimension of core 10 in the vertical direction. This reduces the effect of recess 14 on the magnetic flux generated at the center of core 10 in the vertical direction, making it easier to obtain the desired inductance. In this embodiment, the depth dimension of recess 14 coincides with height dimension L9, which will be described later.

[0029] As shown in FIG. 1, in this embodiment, the recess 14 is formed in a part that is an end (corner) of the core 10 in the winding axis direction and a central part in the left-right direction. That is, as described above, in this embodiment, the recess 14 opens to the outside in the winding axis direction and upward. Also, as shown in FIG. 8, the recess 14 is defined by a first side surface 14a, a second side surface 14b, and a bottom surface (recess bottom surface 14c (see FIG. 7)). The first side surface 14a stands up on the inside in the winding axis direction as viewed from the recess 14. The second side surface 14b stands up on both outsides in the width direction of the coil component 1 as viewed from the recess 14. In this embodiment, the first side surface 14a and the second side surface 14b are flat surfaces that follow the side surfaces of the insertion portion 48, but are not limited to this. The side surfaces that define the recess 14 may be curved surfaces.

[0030] 8, in this embodiment, the insertion portion 48 (insertion protrusion 48x) is spaced apart from the first side surface 14a and the second side surface 14b. In other words, there is a gap between the insertion portion 48 and the first side surface 14a and the second side surface 14b. Alternatively to this embodiment, the insertion portion 48 (its side surface) may be in contact (abutment or pressure contact) with each of the first side surface 14a and the second side surface 14b.

[0031] The insertion portion 48 is a part of the cover 40 and is the part that is received in the recess 14 of the core 10 . In the present embodiment, the insertion portion 48 is formed integrally with a portion of the cover 40 other than the insertion portion 48. Specifically, the insertion portion 48 is formed integrally with the top surface portion 42. Also, in a second embodiment described below, the insertion portion 48 is formed integrally with the leg portion 44. Alternatively, the insertion portion 48 may be formed as a separate member from the portion of the cover 40 other than the insertion portion 48, and attached to the portion by means of adhesion, engagement, or the like.

[0032] 4, in the present embodiment, the insertion portion 48 is an insertion protrusion 48x that protrudes downward from the top surface portion 42. Specifically, the insertion portion 48 is a part of the cover 40, and is a part that protrudes downward from the back surface of the top surface portion 42. In this embodiment, the shape of the cross section of the insertion protrusion 48x is rectangular, but is not limited to this and may be circular, polygonal, or the like.

[0033] 1, in this embodiment, the insertion protrusion 48x is formed at an end of the cover 40 in the winding axis direction. More specifically, the insertion protrusion 48x protrudes from an end (the front end or the rear end) in the winding axis direction on the back surface of the top surface portion 42. In this embodiment, as shown in Fig. 4, the insertion protrusion 48x is formed to protrude from the center of the top surface portion 42 in the left-right direction. In other words, the insertion protrusion 48x protrudes from a part of the top surface portion 42 between two notches 41, 41 formed side by side in the left-right direction. Therefore, as shown in Fig. 4, the insertion protrusion 48x is disposed between the two connection portions 32, 32 in the left-right direction. In other words, the insertion protrusion 48x is disposed between the two coils 20, 20 (drawing portions 20b, 20b) in the left-right direction.

[0034] The insertion portion 48 (insertion protrusion 48x) is housed in the recess 14. Here, the insertion portion 48 being housed in the recess 14 means that the insertion portion 48 is disposed in at least a portion of the space of the recess 14. As will be described later, as in this embodiment, only a portion (tip portion) of the insertion portion 48 may be housed in the recess 14, or substantially the entire insertion portion 48 may be housed in the recess 14.

[0035] Here, a process of attaching the cover 40 to the core 10 will be described. In the process of manufacturing the coil component 1, the cover 40 is attached to the core 10. In a state in which the cover 40 is attached to the core 10, it is preferable that the coil 20 and the connection terminal 30 are attached to the core 10 and the coil 20 and the connection terminal 30 are connected by solder 50. Cover 40 is attached to core 10 from above. That is, cover 40 is attached to core 10 by descending straight down from above. When cover 40 is lowered onto core 10, legs 44 (particularly claws 46) first come into contact with core 10 (particularly its side surface). As legs 44 come into contact with the side surface of core 10, legs 44 are urged by core 10 and spread outward in the left-right direction. That is, legs 44 are urged outward in the left-right direction by core 10 with claws 46 and their vicinity urged outward in the left-right direction by core 10 with the base end (upper end) of hanging portion 47 as a fulcrum, so that legs 44 bend and spread. When the cover 40 is further lowered, the insertion portion 48 (insertion protrusion 48x) starts to be inserted into the recess 14 from the lower end side of the insertion portion 48. If the positional relationship between the cover 40 and the core 10 is misaligned at this time and the insertion portion 48 cannot be inserted into the recess 14, the position of the cover 40 or the core 10 may be adjusted as appropriate. When the insertion portion 48 is inserted into the recess 14, the side surfaces that define the recess 14 restrict misalignment of the insertion portion 48 in at least one of the winding axis directions and in at least one of the left and right directions. When the cover 40 is further lowered, the claws 46 engage with the engagement portions 12 of the core 10, completing the attachment of the cover 40 to the core 10. That is, the engagement of the claws 46 with the engagement portions 12 is performed with the insertion portions 48 housed in the recesses 14. This makes it easy to position the cover 40 relative to the core 10, as described above.

[0036] As shown in FIG. 4, in this embodiment, the lower surface (insertion portion lower surface 48a) of the insertion portion 48 (insertion protrusion 48x) of the cover 40 is in contact with the recess bottom surface 14c. Specifically, the insertion protrusion 48x is placed on the recess bottom surface 14c, and the recess bottom surface 14c supports the insertion portion 48. That is, at least a part of the weight of the cover 40 is applied to the recess bottom surface 14c. In this embodiment, in the natural state, the cover 40 is placed only on the recess bottom surfaces 14c of the two recesses 14, and the entire weight of the cover 40 is applied to the recess bottom surface 14c. Here, the natural state refers to a state in which the cover 40 is not lifted, and no force is applied to the cover 40. Also, the engagement surface 46a of the claw portion 46 and the engagement portion 12 of the core 10 are spaced apart in the up-down direction. That is, there is a gap between the engagement surface 46a and the engagement portion 12. The engagement surface 46a of the claw portion 46 is a part of the surface of the claw portion 46 that faces the engagement portion 12. In this embodiment, the engagement surface 46a is a surface that faces the engagement portion 12 in the up-down direction. That is, the engagement surface 46a is the upper surface of the claw portion 46. In this embodiment, the engagement surface 46a of the claw portion 46 and the engagement portion 12 of the core 10 (a surface of the core 10 that faces downward) both extend in the left-right direction and the front-rear direction, and the engagement surface 46a and the engagement portion 12 are parallel. Alternatively, the engagement surface 46a of the claw portion 46 and the engagement portion 12 of the core 10 do not have to be completely parallel. The engagement surface 46a of the claw portion 46 may extend at an angle with respect to the engagement portion 12 of the core 10. In other words, it is sufficient that the engagement surface 46a of the claw portion 46 faces the engagement portion 12 of the core 10 via a gap. As described above, since the claws 46 are spaced apart from the core 10, it is possible to prevent the claws 46 from damaging the core 10. On the other hand, by keeping the lower surface of the insertion portion 48 (insertion portion lower surface 48a) in contact with the bottom surface of the recess 14 (recess bottom surface 14c), a frictional force is generated between the insertion portion lower surface 48a and the recess bottom surface 14c, and this friction prevents the cover 40 from shifting laterally relative to the core 10.

[0037] In this embodiment, the separation distance D1 in the up-down direction between the engagement surface 46a of the claw portion 46 and the engagement portion 12 of the core 10 is smaller than the dimension (depth dimension) of the recess 14 in the up-down direction. When the cover 40 is gripped or sucked to lift the coil component 1 upward, the cover 40 is displaced upward with respect to the core 10. Specifically, the insertion portion 48 (insertion portion lower surface 48a) is separated from the recess bottom surface 14c, and the engagement surface 46a of the claw portion 46 comes into contact with the core 10 (engagement portion 12). Since the separation distance D1 is smaller than the depth dimension of the recess 14, the insertion portion 48 is prevented from coming out of the recess 14 even when the coil component 1 is lifted upward as described above.

[0038] Moreover, it is preferable that the separation distance D1 in the up-down direction between the engagement surface 46a of the claw portion 46 and the engagement portion 12 of the core 10 is smaller than the dimension (thickness dimension L1) of the claw portion 46 in the up-down direction. The thickness dimension L1 of the claw portion 46 is the smallest value among the dimensions of the claw portion 46 in the up-down direction. In this embodiment, the thickness dimension L1 of the claw portion 46 is the thickness dimension at the tip of the claw portion 46. With the above-mentioned configuration, damage to the claw portions 46 due to the impact caused when the claw portions 46 collide with the core 10 when the coil device 1 is lifted upward as described above is suppressed.

[0039] The separation distance D1 in the vertical direction between the engagement surface 46a of the claw portion 46 and the engagement portion 12 of the core 10 is greater than zero. The separation distance D1 in the vertical direction between the engagement surface 46a of the claw portion 46 and the engagement portion 12 of the core 10 may be greater than a separation distance D6 between the insertion portion 48 and the first side surface 14a, which will be described later. In addition, the separation distance D1 in the vertical direction between the engagement surface 46a of the claw portion 46 and the engagement portion 12 of the core 10 may be greater than a separation distance D5 between the insertion portion 48 and the second side surface 14b. This effectively prevents the claw portion 46 from coming into contact with the core 10, even if the cover 40 is misaligned so as to rotate relative to the core 10. Alternatively, the separation distance D1 may be smaller than the separation distance D6 or the separation distance D5.

[0040] In this embodiment, the dimension (width dimension L2) of insertion protrusion 48x in the width direction (left-right direction) of coil part 1 is larger than the dimension (width dimension L3) of leg portion 44 (hanging portion 47) in the width direction (left-right direction) of coil part 1. Here, width dimension L3 of leg portion 44 is the dimension of hanging portion 47 in the left-right direction. With the above configuration, even if the cover 40 is shifted in the width direction relative to the core 10 while the insertion protrusion 48x is housed in the recess 14 and stress is applied to the insertion protrusion 48x, the width dimension L2 of the insertion protrusion 48x is large, so that the insertion protrusion 48x can fully bear the stress. In other words, damage such as deformation or breakage of the leg 44 (particularly the hanging portion 47) due to the stress is suppressed.

[0041] On the other hand, as shown in FIG. 6 and FIG. 7, in this embodiment, the dimension (dimension L4) of the insertion protrusion 48x in the winding axis direction (front-rear direction) is smaller than the dimension (dimension L5) of the leg portion 44 (hanging portion 47) in the winding axis direction (front-rear direction). In this way, the width dimension L2 of the insertion protrusion 48x is larger than the width dimension L3 of the leg portion 44, and the dimension L4 of the insertion protrusion 48x is smaller than the dimension L5 of the leg portion 44, thereby realizing a cover 40 in which the insertion protrusion 48x is rigid while the leg portion 44 is flexible. Specifically, with the above configuration, the cross-sectional shape of the insertion protrusion 48x becomes closer to a perfect circle or a square. That is, in the cross-section of the insertion protrusion 48x, the dimension of the insertion protrusion 48x in the front-rear direction becomes close to the dimension of the insertion protrusion 48x in the left-right direction. As a result, the insertion protrusion 48x can have a rigidity that makes it difficult to bend in the left-right direction or the front-rear direction. On the other hand, with the above-mentioned configuration, leg portion 44 (hanging portion 47) can have a thin plate shape compared to insertion protrusion 48x, which allows leg portion 44 to bend well in the left-right direction.

[0042] 7, the cover 40 includes a partition portion 43. The partition portion 43 extends downward from the top surface portion 42 (its back surface) at the center of the cover 40 in the winding axis direction. Specifically, the partition portion 43 is a plate-shaped member extending in the front-rear direction and the up-down direction. The partition portion 43 is formed integrally with the top surface portion 42, but may be a separate member from the top surface portion 42. As shown in FIG. 5, the partition 43 is inserted into the annular core 10. Inserted into the annular core 10 means that the core 10 is inserted into the hollow portion 18 of the annular core 10. The partition 43 may pass through the hollow portion 18 of the annular core 10 and terminate below the coil 20, or may terminate halfway through the hollow portion 18 in the vertical direction. In this embodiment, the partition 43 terminates below the central axis (winding shaft) of the coil 20 and above the lowest end of the coil 20 (winding portion 20a). In this embodiment, the partition 43 terminates above the lowest end of the winding shaft portion 10a.

[0043] 7, in this embodiment, the partitions 43 and the insertion protrusions 48x are spaced apart in the winding axis direction (front-rear direction). That is, the partitions 43 and the insertion protrusions 48x protrude downward from positions spaced apart from each other on the back surface of the top surface 42. In this embodiment, the partitions 43 and the insertion protrusions 48x are connected only by the top surface 42, and the entire partitions 43 and the entire insertion protrusions 48x are spaced apart in the front-rear direction. In this embodiment, a part of core 10 (inner edge portion 11) is inserted between partition portion 43 and insertion protrusion 48x in the winding axis direction. Inner edge portion 11 is a part of core 10 that is sandwiched between partition portion 43 and insertion protrusion 48x in the front-rear direction. In other words, inner edge portion 11 is a part of annular core 10 that is on the inner edge side of recess 14 (particularly its upper end portion), and is a portion of flange portion 10b that is located inside in the winding axis direction. Since a part of the core 10 is sandwiched between the insertion protrusion 48x and the partition portion 43, the cover 40 is effectively prevented from being misaligned with respect to the core 10 in the winding axis direction.

[0044] In this embodiment, the inner edge portion 11 is sandwiched between the partition portion 43 and the insertion protrusion 48x, and the partition portion 43 is spaced from the inner edge portion 11 in the front-rear direction. This prevents the partition portion 43, which is disposed in the hollow portion 18 of the annular core 10, from contacting the inner edge portion 11 of the core 10 and damaging the inner edge portion 11, while preventing the partition portion 43 and the insertion protrusion 48x from misaligning the cover 40 with respect to the core 10. As a result, the inner edge portion 11 is prevented from being scratched or otherwise dented, which would affect the magnetic flux flowing through the core 10, and the desired inductance is easily obtained.

[0045] As shown in FIG. 8, in this embodiment, the separation distance D6 between the insertion protrusion 48x and the first side surface 14a is larger than the separation distance D5 between the insertion protrusion 48x and the second side surface 14b. By making the separation distance D6 between the insertion protrusion 48x and the first side surface 14a larger in this way, the cover 40 can move in the winding axis direction relative to the core 10 within a predetermined range. As a result, the insertion protrusion 48x or the partition portion 43 is prevented from contacting the core 10 and affecting the magnetic flux flowing through the core 10, making it easier to obtain a desired inductance. Specifically, the first side surface 14a is a side surface that is located on the inner edge side of the core 10 among the side surfaces that define the recess 14. Therefore, if the insertion protrusion 48x collides with the first side surface 14a of the core 10, a dent such as a scratch may occur in a part of the core 10 closer to the inner edge than if the insertion protrusion 48x collides with the second side surface 14b of the core 10. In this case, by making the separation distance D6 between the first side surface 14a and the insertion protrusion 48x sufficiently large, it is possible to suppress the occurrence of such a recess and obtain a desired inductance. In addition, in this embodiment, a partition portion 43 is inserted into the hollow portion 18 of the core 10. By making the separation distance D6 between the insertion protrusion 48x and the first side surface 14a sufficient, it is possible to insert the partition portion 43 into the annular core 10 while suppressing the partition portion 43 from colliding with the inner edge portion 11 of the core 10. This makes it possible to suppress the partition portion 43 from causing a recess such as a scratch on the inner edge portion 11, and obtain a desired inductance.

[0046] The separation distance D6 between the insertion protrusion 48x and the first side surface 14a is the separation distance between the insertion protrusion 48x and the first side surface 14a in the winding axis direction (front-rear direction). When the cover 40 is positioned shifted in the front-rear direction with respect to the core 10, the separation distance D6 may be calculated as follows. Specifically, when the distance between the insertion protrusion 48x formed on the front side of the cover 40 and the first side surface 14a of the recess 14 that houses the insertion protrusion 48x is different from the distance between the insertion protrusion 48x formed on the rear side of the cover 40 and the first side surface 14a of the recess 14 that houses the insertion protrusion 48x, the average value of the two may be used as the separation distance D6. The separation distance D5 between the insertion protrusion 48x and the second side surface 14b is the separation distance between the insertion protrusion 48x and the second side surface 14b in the left-right direction. When the insertion protrusion 48x is shifted to the left or right side in the recess 14, the separation distance D5 may be calculated as follows. That is, when the separation distance between the insertion protrusion 48x and the second side surface 14b defining the left side of the recess 14 accommodating the insertion protrusion 48x is different from the separation distance between the insertion protrusion 48x and the second side surface 14b defining the right side of the recess 14 accommodating the insertion protrusion 48x, the average value thereof may be used as the separation distance D5.

[0047] In this embodiment, the separation distance D6 between the insertion protrusion 48x and the first side surface 14a is greater than the separation distance D7 between the inner edge portion 11 and the partition portion 43. This ensures room for the insertion protrusion 48x to move in the winding axis direction inside the recess 14, and makes it possible to adjust the position of the cover 40 relative to the core 10 so that the partition portion 43 does not contact the inner edge portion 11 when inserting the partition portion 43 into the annular core 10. As a result, the partition portion 43 is less likely to cause dents such as scratches on the inner edge portion 11, making it easier to obtain the desired inductance. In this embodiment, the distance D5 between the insertion protrusion 48x and the second side surface 14b is greater than the distance D7 between the inner edge portion 11 and the partition portion 43.

[0048] Alternatively to this embodiment, the separation distance D6 between the insertion protrusion 48x and the first side surface 14a may be equal to or smaller than the separation distance D5 between the insertion protrusion 48x and the second side surface 14b. Alternatively, instead of this embodiment, the separation distance D6 between the insertion protrusion 48x and the first side surface 14a may be equal to or smaller than the separation distance D7 between the inner edge portion 11 and the partition portion 43. Alternatively, in this embodiment, the separation distance D5 between the insertion protrusion 48x and the second side surface 14b may be equal to the separation distance D7 between the inner edge portion 11 and the partition portion 43 or may be greater than this.

[0049] As shown in FIG. 4, in this embodiment, the dimension (height dimension L6) from the protruding end (lower end) of the insertion portion 48 (insertion protrusion 48x) in the up-down direction to the engagement surface 46a of the claw portion 46 (particularly the tip of the claw portion 46) is smaller than the dimension (height dimension L7) from the opening end of the recess 14 to the engagement portion 12 of the core 10 in the up-down direction. In this embodiment, the opening end of the recess 14 is the upper end of the recess 14 and coincides with the upper surface of the core 10. This allows the cover 40 to be attached to the core 10 from above the core 10 in the order that the lower end of the insertion portion 48 is inserted into the recess 14 and then the claw portion 46 engages with the core 10. As a result, the positioning of the cover 40 can be performed before the engagement of the claw portion 46 with the core 10.

[0050] 4, in this embodiment, the protruding length L8 of the insertion protrusion 48x is greater than the dimension (height dimension L6) from the protruding end of the insertion protrusion 48x to the engagement surface 46a of the claw portion 46. The protruding length L8 of the insertion protrusion 48x is the length dimension in the up-down direction from the back surface of the top surface portion 42 to the protruding end of the insertion protrusion 48x. Because the protruding length L8 of the insertion protrusion 48x is greater than the height dimension L6 from the protruding end of the insertion protrusion 48x to the claw portion 46, the insertion protrusion 48x is reliably inserted into the recess 14 before the claw portion 46 engages with the core 10. In particular, in this embodiment, the separation distance D8 between the core 10 and the top surface portion 42 in the up-down direction is large, as will be described later. Even if the separation distance D8 is large, the above-mentioned configuration allows the insertion protrusion 48x to be inserted into the recess 14 before the claw portion 46 engages with the core 10.

[0051] 4, in this embodiment, the separation distance D8 between the core 10 and the top surface portion 42 is greater than the height dimension L9 of a portion (tip portion) of the insertion protrusion 48x that is naturally housed in the recess 14. In other words, the separation distance D8 between the core 10 and the top surface portion 42 is greater than the depth dimension (vertical dimension) of the recess 14. That is, in this embodiment, a sufficient length region of the base end portion of the insertion protrusion 48x is exposed from the recess 14, and only the tip portion of the insertion protrusion 48x is housed in the recess 14. When the cover 40 is unexpectedly displaced laterally in the left-right direction relative to the core 10, the insertion protrusion 48x applies stress to the core 10 (particularly the second side surface 14b that defines the recess 14). In this embodiment, only a portion of the tip of the insertion protrusion 48x is housed in the recess 14, so the stress that only this portion applies to the core 10 is smaller than when most of the insertion protrusion 48x is housed in the recess 14. This makes it possible to prevent the core 10 from being damaged or otherwise dented, which would affect the magnetic flux generated within the core 10, making it easier to obtain the desired inductance. In addition, since the separation distance D8 between the core 10 and the top surface portion 42 is larger than the height dimension L9 of the insertion protrusion 48x housed in the recess 14, in this embodiment, the protruding length L8 of the insertion protrusion 48x is sufficiently large, and a part of the tip side of the insertion protrusion 48x is housed in the recess 14. This allows the insertion protrusion 48x to have some flexibility while being rigid as described above. Therefore, even if the cover 40 unexpectedly shifts laterally relative to the core 10, the insertion protrusion 48x can bend slightly, and the stress applied to the core 10 by the insertion protrusion 48x unexpectedly colliding with the core 10 can be alleviated.

[0052] 2, in this embodiment, the standing portion 34 is provided with a terminal protrusion 34a. The terminal protrusion 34a is a protrusion that protrudes from an inner main surface 34b of the standing portion 34 toward the core 10. The inner main surface 34b of the standing portion 34 is the main surface that faces the side surface of the core 10, of the two main surfaces of the plate-shaped standing portion 34. In this embodiment, the terminal protrusion 34a protrudes inward in the front-rear direction. 9(b), in this embodiment, the terminal protrusion 34a is formed by deformation of the standing portion 34. Specifically, the terminal protrusion 34a is formed by forming unevenness in a direction toward the core 10 on a part of the standing portion 34 that forms the terminal protrusion 34a. Therefore, a recess is formed on the outer main surface of the standing portion 34 (the main surface facing the inner main surface 34b).

[0053] As shown in Fig. 2, in this embodiment, the core 10 has a groove 16 formed on a side surface (front or back surface) facing the standing portion 34. The groove 16 extends in the vertical direction. As shown in Fig. 9(b), the terminal protrusion 34a is inserted into the groove 16. In other words, the terminal protrusion 34a fits into the groove 16. The terminal protrusion 34a is inserted into the recessed groove 16, so that the connection terminal 30 can be easily positioned relative to the core 10. Furthermore, if the connection terminal 30 is disposed in an inappropriate position on the core 10 in the manufactured coil component 1, the terminal protrusion 34a separates the connection terminal 30 from the core 10. This makes it easy to detect such a defective coil component 1. Furthermore, since the groove 16 extends in the vertical direction as in this embodiment, the adhesive (not shown) that is applied to the inner main surface 34b or the like and disposed between the inner main surface 34b and the core 10 can accumulate in the groove. This makes it possible to prevent the adhesive from flowing out of the space between the connection terminal 30 and the core 10 to the outside of the space. Furthermore, the surface area within the groove 16, that is, the area where the core 10 and the connection terminal 30 are bonded by the adhesive, increases, so that the core 10 and the connection terminal 30 can be bonded well.

[0054] In this embodiment, as shown in FIG. 9(a), the area of ​​the terminal protrusion 34a as viewed from the protruding direction (front-rear direction) of the terminal protrusion 34a is smaller than the area of ​​the recessed groove 16 as viewed from the protruding direction. Therefore, when the terminal protrusion 34a is inserted into the recessed groove 16, the recessed groove 16 has a non-inserted area 16a, which is an area where the terminal protrusion 34a is not inserted. In other words, the non-inserted area 16a is an area in the recessed groove 16 that does not overlap with the terminal protrusion 34a as viewed from the protruding direction of the terminal protrusion 34a. This allows adhesive to accumulate in the non-inserted area 16a. Note that the area in the recessed groove 16 that overlaps with the terminal protrusion 34a as viewed from the protruding direction of the terminal protrusion 34a may be referred to as an inserted area 16b.

[0055] In this embodiment, as shown in Figures 9(a) and 9(b), the terminal projection 34a is inserted into the upper end of the recessed groove 16, and is not inserted into the lower end of the recessed groove 16. In other words, when the terminal projection 34a is inserted into the recessed groove 16, the recessed groove 16 extends downward from the terminal projection 34a. In this embodiment, the recessed groove 16 extends to the lower end of the core 10. In further words, in this embodiment, as shown in Figure 9(a), the non-inserted region 16a is located below the inserted region 16b within the recessed groove 16 when viewed from the protruding direction of the terminal projection 34a. As a result, even if the adhesive accidentally accumulates near the terminal protrusion 34a, for example when the adhesive has high viscosity, the adhesive can flow from the terminal protrusion 34a downward into the non-insertion region 16a without accumulating near the terminal protrusion 34a. In particular, the adhesive can flow from near the terminal protrusion 34a into the non-insertion region 16a due to its own weight.

[0056] Alternatively to this embodiment, the groove 16 may extend from the terminal protrusion 34a to above the terminal protrusion 34a when the terminal protrusion 34a is fitted into the groove 16. Also, the groove 16 may extend from the terminal protrusion 34a to the upper end of the core 10. Alternatively, instead of this embodiment, the groove 16 may extend from the terminal protrusion 34a both upward and downward of the terminal protrusion 34a when the terminal protrusion 34a is fitted into the groove 16. Furthermore, the groove 16 may extend from the upper end to the lower end of the core 10.

[0057] 9(b), in this embodiment, the protruding height (dimension in the front-rear direction) of the terminal projection 34a is smaller than the depth of the recessed groove 16 (dimension of the recessed groove 16 in the protruding direction of the terminal projection 34a). Therefore, when the terminal projection 34a is fitted into the recessed groove 16, the protruding end of the terminal projection 34a is separated from the bottom surface (surface facing forward or backward) of the recessed groove 16. This allows the connection terminal 30 (particularly the inner main surface 34b of the standing portion 34) to come into surface contact with the side surface of the core 10, and the connection terminal 30 is well attached to the core 10 by the adhesive.

[0058] 9(a), in this embodiment, the dimension of the terminal protrusion 34a in the up-down direction is larger than the dimension of the terminal protrusion 34a in the width direction of the coil component 1. Specifically, in this embodiment, the shape of the terminal protrusion 34a as viewed from the protruding direction of the terminal protrusion 34a is a substantially ellipse with the up-down direction as the longitudinal direction. Since terminal projection 34a has a long shape in the up-down direction, terminal projection 34a is unlikely to rotate in recessed groove 16 when viewed in the front-rear direction. This makes it possible to prevent connection terminal 30 from being misaligned and rotating with respect to core 10 when connecting terminal 30 is attached to core 10. As a result, the main surface of mounting portion 36 is easily arranged parallel to the mounting board, and coil component 1 that can be well grounded to the mounting board can be manufactured.

[0059] 9(b), in this embodiment, the upper end of the terminal projection 34a is not in contact with the core 10. In other words, a part of the side surface of the terminal projection 34a facing upward is not in contact with the core 10. In other words, when the terminal projection 34a is fitted into the recessed groove 16, a space (gap) is generated above the terminal projection 34a. Specifically, in this embodiment in which groove 16 does not extend to the top surface of core 10 and the upper end of groove 16 is located in the center of the side surface of core 10, the side surface (particularly the upper side surface) that defines groove 16 is separated from terminal projection 34a. Even if groove 16 extends to the top surface of core 10 instead of this embodiment, it can be said that terminal projection 34a is not in contact with core 10. Since the upper end of the terminal protrusion 34a is not in contact with the core 10, when the connection terminal 30 is attached to the core 10, the position of the connection terminal 30 can be adjusted in the vertical direction so that the mounting portion 36 comes into surface contact with the lower surface of the core 10. This makes it possible to manufacture a coil component 1 that can be favorably grounded to a mounting board.

[0060] 3, in this embodiment, when the coil component 1 is viewed in a plan view, the connection portion 32 is exposed from the notch 41. In other words, the cover 40 (top surface portion 42) is not disposed above at least a portion of the connection portion 32. Here, when the coil component 1 is viewed in a plan view, the connection portion 32 is exposed from the notch 41 means that the connection portion 32 is not covered by the cover 40 when the coil component 1 is viewed in a plan view. For example, even if the connection portion 32 cannot be directly seen due to another member such as solder 50 when the coil component 1 is viewed in a plan view, it can be said that the connection portion 32 is exposed from the notch 41 as long as the connection portion 32 is not covered by the cover 40. In this embodiment, a part of the connection portion 32 that is connected to the coil 20 (the lead-out portion 20b) is exposed from the notch 41. More specifically, the crimped portion 32a of the connection portion 32 is exposed from the notch 41. As described above, when the coil part 1 is viewed in a plan view, the connection portion 32 is exposed from the notch 41, which prevents the cover 40 from being difficult to attach to the core 10 due to the bulge caused by the pull-out portion 20b of the large diameter winding, the connection portion 32 (fastening portion 32a) or the solder 50, or a combination of these.

[0061] Second Embodiment FIG. 10 is a front view showing an example of the coil device 1 according to this embodiment. First, an overview of a coil component 1 according to the present embodiment will be described.

[0062] In the coil device 1 of this embodiment, similarly to the first embodiment, the insertion portion 48 which is a part of the cover 40 is housed in the recess 14 .

[0063] Next, the coil device 1 of the present embodiment will be described in detail. As shown in FIG. 10, the insertion portion 48 of this embodiment is different from that of the first embodiment in that it is provided on the leg portion 44 of the cover 40. Specifically, the insertion portion 48 is an insertion protrusion 48y that protrudes inward in the width direction (left-right direction) of the coil device 1 from the base end of the leg portion 44. The recess 14 is open outward and upward in the width direction of the coil part 1. The insertion protrusion 48y is housed in the recess 14. With the above-mentioned configuration, since the leg portion 44 itself is provided with the insertion protrusion 48y, the leg portion 44 can be positioned well.

[0064] As shown in FIG. 10, in this embodiment, an insertion protrusion 48y protrudes from the surface (main surface) of the leg portion 44 (hanging portion 47) that faces the side surface of the core 10. Forming insertion protrusion 48y at the base end of leg portion 44 means that insertion protrusion 48y is formed at a position offset upward from the center of leg portion 44 (hanging portion 47) in the vertical direction. Insertion protrusion 48y may be provided on the uppermost end side of leg portion 44, or may be provided at a position slightly shifted upward from the center of leg portion 44 (hanging portion 47) in the vertical direction. In this embodiment, the insertion protrusion 48y is formed in the middle of the leg 44 in the vertical direction. In other words, the insertion protrusion 48y is spaced apart in the vertical direction from the top surface 42. This allows the leg 44 to have sufficient flexibility compared to a case in which the insertion protrusion 48y is integrally formed adjacent to the top surface 42 in the vertical direction.

[0065] As shown in Fig. 10, the recess 14 is open on one side in the left-right direction and on the upper side. In other words, as shown in Fig. 11, the recess 14 is defined on the surface of the core 10 on the lower side, one side in the left-right direction, and both sides in the up-down direction. 10, the insertion protrusion 48y (its lower surface) is in contact with the bottom surface of the recess 14. The insertion protrusion 48y (its side surface) is spaced apart from the side surfaces that define either the left or right side of the recess 14. As shown in FIG. 11, the insertion protrusion 48y (its side surface) is spaced apart from the side surface of the recess 14 that defines the top and bottom directions.

[0066] 10, in this embodiment, when the insertion protrusion 48y is fitted into the recess 14, the upper end of the insertion protrusion 48y is exposed so as to protrude upward from the recess 14. This makes it possible to visually confirm that the insertion protrusion 48y is fitted into the recess 14 when viewed from the front-rear direction. Alternatively to this embodiment, the upper end of the insertion protrusion 48y may not protrude above the recess 14 from the recess 14. That is, the upper end of the insertion protrusion 48y may be housed inside the recess 14.

[0067] 11, in this embodiment, the dimension of insertion protrusion 48y in the front-rear direction is smaller than the dimension of leg portion 44 (hanging portion 47) in the front-rear direction, but is not limited to this. In this embodiment, the dimension of insertion protrusion 48y in the front-rear direction may be equal to the dimension of leg portion 44 (hanging portion 47) in the front-rear direction.

[0068] 11, the insertion protrusion 48y in this embodiment is provided on each of the four legs 44, but is not limited to this. The insertion protrusion 48y may be provided on only some of the four legs 44. For example, the insertion protrusion 48y may be provided on only two of the four legs 44 that are diagonally opposite each other.

[0069] 11, in this embodiment, two notches 41 are provided at each of the front end and rear end of the top surface portion 42, but only one notch 41 may be provided at each of the front end and rear end of the top surface portion 42. In other words, a portion of the top surface portion 42 sandwiched between two notches 41 aligned in the left-right direction in FIG.

[0070] The coil device 1 of this embodiment has the following features, similar to the first embodiment. The lower surface of the insertion protrusion 48y is in contact with the bottom surface 14c of the recess, and the engagement surface 46a of the claw portion 46 and the engagement portion 12 are spaced apart. The dimension of the insertion protrusion 48x in the width direction of the coil component 1 is larger than the dimension of the leg portion 44 in the width direction. The rising portion 34 is provided with a terminal projection 34 a , and the terminal projection 34 a is inserted into the corresponding groove 16 in the core 10 . The dimension of the terminal protrusion 34a in the vertical direction is greater than the dimension of the terminal protrusion 34a in the width direction of the coil component 1. When the coil device 1 is viewed in plan, the connection portion 32 is exposed from the notch 41 .

[0071] The present invention is not limited to the above-described embodiment, but includes various modifications and improvements as long as the object of the present invention is achieved. The following modifications can be combined as appropriate.

[0072] The above embodiment encompasses the following technical ideas. (1) a core formed in a ring shape in a plan view; one or more coils wound around a portion of the core with a winding axis extending in a direction parallel to the extension direction of the portion; A connection terminal electrically connected to the coil; a cover disposed above the core and the coil; The cover is a top surface portion covering the core and the coil; a leg portion extending downward from the top surface portion along a side surface of the core and having a claw portion protruding toward the core, The cover is attached to the core by engaging the claw portion with an engaging portion of the core, the core has a recess formed on an outer edge of an upper surface of the core so as to be recessed downward; A coil component, in which an insertion portion that is a part of the cover is housed in the recess. (2) the lower surface of the insertion portion is in contact with the bottom surface of the recess, The coil component according to (1), wherein an engagement surface of the claw portion that faces the engagement portion and the engagement portion of the core are spaced apart in the up-down direction. (2-1) The coil component according to (2), in which the vertical separation distance between the engagement surfaces of the claw portions and the engagement portions of the core is smaller than the vertical dimension (depth dimension) of the recesses. (2-2) The coil component according to (2), in which the vertical separation distance between the engagement surface of the claw portion and the engagement portion of the core is smaller than the vertical dimension (thickness dimension) of the claw portion. (3) The insertion portion is an insertion protrusion that protrudes downward from the top surface portion, The coil component according to (1) or (2), wherein a dimension of the insertion protrusion in a width direction of the coil component is larger than a dimension of the leg portion in the width direction. (3-1) The coil component according to (3), wherein a dimension of the insertion protrusion in the winding axis direction is smaller than a dimension of the leg portion in the winding axis direction. (4) the insertion protrusion is formed at an end of the cover in the winding axis direction, the cover includes a partition portion extending downward from the top surface portion at a center side of the cover in the winding axis direction and inserted into the annular core, the partition portion and the insertion protrusion are spaced apart from each other in the winding axis direction, The coil component according to (3), wherein a portion of the core is inserted between the partition portion and the insertion protrusion in the winding axis direction. (4-1) The coil component according to (4), wherein the partition portion is spaced apart from a part of the core in the front-rear direction. (5) The recessed portion is the winding axis direction is open to the outside and to the upper side, a first side surface rising inward in the winding axis direction and a second side surface rising outward on both sides in a width direction of the coil component, The insertion protrusion, the first side surface, and the second side surface are spaced apart from each other, The coil component according to (4), wherein a distance between the insertion protrusion and the first side surface is greater than a distance between the insertion protrusion and the second side surface. (5-1) The coil component according to (5), in which the distance between the insertion protrusion and the first side surface is greater than the distance between the inner edge portion and the partition portion. (6) The connection terminal is attached to one end of the core in the winding axis direction, The connection terminal is a connection portion that connects to one end of the coil along an upper surface of the core; a rising portion extending from the connection portion along a side surface of the core; a mounting portion extending from the upright portion along a lower surface of the core; The rising portion is provided with a terminal protrusion that protrudes toward the core, The coil component according to any one of (1) to (5), wherein the terminal protrusion is inserted into a recessed groove formed on a side surface of the core facing the standing portion and extending in the vertical direction. (6-1) The coil component according to (6), wherein an area of ​​the terminal protrusion as viewed from a protruding direction of the terminal protrusion is smaller than an area of ​​the recessed groove as viewed from the protruding direction. (6-2) The coil component according to (6), wherein the terminal protrusion is inserted into an upper end of the groove and is not inserted into a lower end of the groove. (6-3) The coil component according to (6), wherein an upper end of the terminal projection is not in contact with the core. (7) The coil component according to (6), wherein a dimension of the terminal protrusion in a vertical direction is larger than a dimension of the terminal protrusion in a width direction of the coil component. (8) An end portion of the top surface portion in the winding axis direction has a notch that is recessed inward in the winding axis direction, The coil component according to (6) or (7), wherein the connection portion is exposed from the notch when the coil component is viewed in a plan view. (9) The insertion portion is an insertion protrusion that protrudes inward in a width direction of the coil component from a base end of the leg, the recess is open outward and upward in a width direction of the coil component, The coil component according to (1), wherein the insertion protrusion is accommodated in the recess. (9-1) The coil component according to (9), wherein the insertion protrusion is spaced apart from the top surface in the up-down direction. (9-2) The coil component according to (9), wherein the insertion protrusion is fitted into the recess, and an upper end of the insertion protrusion is exposed from the recess. (10) The coil component according to (1), wherein the dimension in the vertical direction from the protruding end of the insertion portion to the engagement surface of the claw portion is smaller than the dimension in the vertical direction from the top surface of the core to the engagement portion of the core. (11) The coil component according to (1), wherein the distance between the core and the top surface portion in the up-down direction is greater than the height dimension of a portion of the insertion protrusion that is naturally accommodated in the recess. [Explanation of symbols]

[0073] 1 Coil parts 10 cores 10a Winding shaft part 10b Tsuba 11 Inner edge 12 Engagement part 14 Recess 14a First aspect 14b Second aspect 14c Bottom of recess 16 Groove 16a Non-insertion area 16b Insertion area 18 Hollow part 20 Coil 20a Winding section 20b Drawer part 30 Connection terminal 32 Connection 32a Crimping part 34 Standing part 34a Terminal protrusion 34b Inner main surface 36 Mounting section 40 Cover 41 Notch 42 Top section 43 Partition 44 Legs 45 Side part 46 Claw part 46a Engagement surface 47 Drooping part 48 Insertion section 48a Lower side of insertion 48x Insertion Protrusions 48y Insertion protrusion 50 Solder

Claims

1. A core formed in a ring shape in plan view, One or more coils are wound around a portion of the core with the direction of extension of the portion as the winding axis, The coil has a connection terminal that is electrically connected to it, The core and the cover are positioned above the coil, The aforementioned cover is The top surface portion covers the core and the coil, It includes a leg portion that extends downward from the top surface portion along the side surface of the core and has a claw portion that protrudes toward the core, The cover is attached to the core by the claw portion engaging with the engaging portion of the core. The core has a recess formed downwardly at the outer edge of the upper surface of the core, A coil component in which an insertion portion, which is part of the cover, is housed in the recess.

2. The lower surface of the insertion portion is in contact with the bottom surface of the recess. The coil component according to claim 1, wherein the engagement surface of the claw portion facing the engagement portion and the engagement portion of the core are spaced apart in the vertical direction.

3. The insertion portion is an insertion projection that protrudes downward from the top surface portion. The coil component according to claim 1 or 2, wherein the dimension of the insertion projection in the width direction of the coil component is greater than the dimension of the leg in the width direction.

4. The aforementioned insertion projection is formed at the end of the cover in the winding axis direction, The cover includes a partition portion that extends downward from the top surface portion on the central side of the cover in the winding axis direction and is inserted into the annular core. The partition portion and the insertion projection are spaced apart in the winding axis direction. The coil component according to claim 3, wherein a portion of the core is inserted between the partition portion and the insertion projection in the winding axis direction.

5. The aforementioned recess is The winding axis is open to the outside and upward, It is defined by a first surface that rises inward in the winding axis direction, and a second surface that rises on both outer sides in the width direction of the coil component. The insertion projection and the first and second sides are spaced apart from each other. The coil component according to claim 4, wherein the distance between the insertion projection and the first side surface is greater than the distance between the insertion projection and the second side surface.

6. The aforementioned connection terminal is attached to one end of the core in the winding axis direction, The aforementioned connection terminal is A connecting portion that connects to one end of the coil along the upper surface of the core, Continuing from the aforementioned connection portion, there is an upright portion along the side surface of the core, It includes a mounting portion that extends from the upright portion and along the lower surface of the core, The upright portion is provided with a terminal projection, which is a projection that protrudes toward the core. The coil component according to claim 1, wherein the terminal projection is inserted into a groove formed on the side surface of the core facing the upright portion and extending in the vertical direction.

7. The coil component according to claim 6, wherein the dimension of the terminal projection in the vertical direction is greater than the dimension of the terminal projection in the width direction of the coil component.

8. The end of the top surface portion in the winding axis direction has a notch formed that is recessed inward in the winding axis direction. The coil component according to claim 6 or 7, wherein, when the coil component is viewed in plan, the connecting portion is exposed from the notch.

9. The insertion portion is an insertion projection that protrudes inward in the width direction from the base end of the leg portion, The recess opens outward and upward in the width direction of the coil component. The coil component according to claim 1, wherein the insertion projection is housed in the recess.

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