Coil component

Abstract

The axial center of a coil (10), in a coil component (1), extends along the extension direction of a mounting surface on which the coil component (1) can be mounted. The dimension of a linear member (40) in the radial direction of the coil (10) is greater than the dimension of the linear member (40) in the axial direction of the coil (10). At least a partial length region of each of two lead-out portions (20) is a first region (22). The first regions (22) extend in a lead-out direction that includes an extension-direction component of the mounting surface and a radial-direction component of the coil (10).

Description

Coil component

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

[0002] In a coil component using a coil, the axis of the coil may be arranged along the mounting substrate. Regarding this type of technology, Patent Document 1 below discloses an inductor (1) in which lead wires (17, 19), which are lead-out portions of the coil (3), extend toward the mounting substrate side. The lead wires (17, 19) are respectively inserted into a pair of lead-out holes (21, 23) of the pedestal (9).

[0003] Japanese Patent Application Laid-Open No. 2023-144883

[0004] The coil component mounted on the mounting substrate may receive an unexpected external force. Specifically, due to vibration or the like, the coil component may receive an external force from the mounting substrate in a direction having a normal direction component of the surface of the mounting substrate. In this case, there is room for improvement in the firmness of the connection between the lead-out portion of the coil and the member (mounting substrate or terminal) to which the lead-out portion is connected. For example, in the inductor (1) of Patent Document 1, vertical vibration is transmitted to the mounting substrate, and an upward external force may be applied from the mounting substrate to the coil component by the mounting substrate pushing up the lead wires (17, 19) upward. At this time, after the lead wires (17, 19) are pushed up upward by the mounting substrate, the lead wires (17, 19) may be separated from the mounting substrate.

[0005] The present invention has been made in view of the above problems, and provides a coil component in which the connection between the lead-out portion of the coil and the terminal is more firm.

[0006] The coil component of the present invention comprises a coil which is a linear member formed in a spiral shape, lead portions which are the respective ends of the linear member drawn out from the circumferential surface of the coil, and terminals which are electrically connected to the lead portions, wherein the axis of the coil extends along the extending direction of the mounting surface on which the coil component can be mounted, the dimensions of the linear member in the radial direction of the coil are larger than the dimensions of the linear member in the axial direction of the coil, and the first region which is at least a portion of the length region of each of the two lead portions extends in the lead direction having the extending direction component of the mounting surface and the radial direction component of the coil.

[0007] When the coil's axis aligns with the extending direction of the mounting surface, the linear member including the lead portion has spring properties in a direction perpendicular to the mounting surface because a portion of its length extends in the lead direction having both the extending direction component of the mounting surface and the radial component of the coil. This is because a portion of its length formed spirally around the coil's axis adjacent to the lead portion is bow-shaped, allowing the linear member to deform flexibly around this portion when the lead portion is pressed in a direction perpendicular to the mounting surface.

[0008] According to the coil component of the present invention, the linear member including the lead portion has spring properties in a direction perpendicular to the mounting surface. Therefore, when the coil component is subjected to an external force from the mounting substrate in a direction having a component normal to the surface of the mounting substrate due to vibration or the like, even if the lead portion is pushed up against the terminal connected to the mounting substrate and is about to separate from the terminal, the linear member elastically recovers due to its own spring properties, so the lead portion is not likely to separate significantly from the terminal. As a result, the connection between the lead portion and the terminal is firmly maintained.

[0009] The aforementioned objectives, as well as other objectives, features, and advantages, will become even clearer from the preferred embodiments described below and the accompanying drawings.

[0010] This is a perspective view of a coil component according to the first embodiment of the present invention. This is an exploded perspective view of a coil component according to the first embodiment. This is a right side view of a coil component according to the first embodiment. This is a top view of a coil component according to the first embodiment. This is a front view of a coil component according to the first embodiment. This is a right side view of a linear member according to the first embodiment. This is a perspective view of a coil component according to the second embodiment. This is a front view of a coil component according to the second embodiment. Figure 9(a) is a right side view of a coil according to the second embodiment. Figure 9(b) is a top view of a coil according to the second embodiment.

[0011] The various components of the coil component of the present invention do not need to be independent entities; it is permissible for multiple components to be formed as a single member, for one component to be formed from multiple members, for one component to be part of another component, for a part of one component to overlap with a part of another component, and so on.

[0012] Embodiments of the present invention will be described below with reference to the drawings. In each drawing, corresponding components are denoted by the same reference numeral, and redundant explanations will be omitted as appropriate. In this embodiment, the directions of front, back, left, right, up, and down are defined and described as shown in the figures. However, this is defined for convenience in order to simply explain the relative relationships of the components and does not limit the direction during manufacturing or use of the product implementing the present invention. The up and down direction is the direction perpendicular to the mounting board when the coil component is mounted on the mounting board. In the up and down direction, the upper side is the side away from the mounting board, and the lower side is the side closer to the mounting board. The left and right direction coincides with the width direction of the coil component 1. The left and right direction also coincides with the axial direction of the coil. The direction perpendicular to the up and down direction is sometimes called the lateral direction. Furthermore, in this invention, a plane means a shape that is physically formed with a plane as the target, and it is not necessary for it to be a geometrically perfect plane.

[0013] <First Embodiment> (Coil Component) Figure 1 is a schematic plan view showing an example of a coil component 1 according to the first embodiment of the present invention.

[0014] First, an overview of the coil component 1 of this embodiment will be described. The coil component 1 includes a coil 10, a lead portion 20, and a terminal 30. The coil 10 is a spirally formed linear member 40. The lead portions 20 are the respective ends of the linear member 40 drawn out from the circumferential surface of the coil 10. The terminal 30 is a member electrically connected to the lead portion 20. The axis of the coil 10 extends along the extending direction of the mounting surface on which the coil component 1 can be mounted. The dimensions of the linear member 40 in the radial direction of the coil 10 are larger than the dimensions of the linear member 40 in the axial direction of the coil 10. At least a portion of the length region of each of the two lead portions 20 is the first region 22. The first region 22 extends in the lead direction having a component in the extending direction of the mounting surface and a component in the radial direction of the coil 10. With the above configuration, the linear member 40 including the lead portions 20 has spring properties in a direction perpendicular to the mounting surface. This is because a portion of the length of the coil 10, which is spirally formed around the axis adjacent to the pull-out portion 20, is bow-shaped, allowing the linear member 40 to deform flexibly around this portion when the pull-out portion 20 is pushed in a direction perpendicular to the mounting surface. Specifically, when viewed in the axial direction, the loop portion at the end of the coil 10 is bow-shaped (arc-shaped), and the pull-out portion 20 is pulled out from the end of this loop portion. Because a portion of the pull-out portion 20 (first region 22) extends in the aforementioned pulling direction, the linear member 40 has spring properties such that when an upward or downward force is applied to a portion of the first region 22 (especially the portion on the tip side), the first region 22 can tilt with the loop portion of the coil 10 as the starting point. When the pull-out portion 20 is pushed up by the terminal 30 connected to the mounting board and is about to move away from the terminal 30, the first region 22 can be displaced so as to tilt with respect to the mounting surface. On the other hand, as described above, since the linear member 40 has spring properties, the linear member 40 elastically restores itself so that the inclination of the first region 22 returns to its original position, starting from the loop portion of the coil 10, and the lead-out portion 20 does not easily separate significantly from the terminal 30. Therefore, the connection between the lead-out portion 20 and the terminal 30 is firmly maintained.

[0015] Furthermore, in this embodiment, since the axis of the coil 10 is aligned with the extending direction of the mounting surface, the dimensions of the coil component 1 in the width direction (left-right direction) can be reduced. This reduces the area in contact with the mounting substrate by the coil component 1.

[0016] Next, the coil component 1 of this embodiment will be described in detail. The coil component 1 is a component having a coil 10. The coil component 1 of this embodiment is mounted on a mounting board (not shown) and constitutes a part of an electronic circuit. An inductor or a transformer are examples of the coil component 1.

[0017] The coil 10 is a member formed by a linear member 40 in a spiral shape. In other words, the coil 10 is formed by the linear member 40 forming one or more loops around an axis. In this embodiment, the axis of the coil 10 extends in the left-right direction. Hereinafter, the direction in which the axis extends will be referred to as the axial direction of the coil 10 or simply the axial direction. The linear member 40 is made of a long, conductive material such as metal. As described above, the dimensions of the linear member 40 in the radial direction of the coil 10 are larger than the dimensions of the linear member 40 in the axial direction (left-right direction) of the coil 10. Specifically, the cross-sectional shape of the linear member 40 in this embodiment is a flat shape such as an ellipse or rectangle, and the linear member 40 has a pair of main surfaces 24a that extend in the direction in which the linear member 40 extends. The pair of main surfaces 24a face each other in the thickness direction of the linear member 40. The linear member 40 is formed into a spiral shape by curving its main surface 24a within the plane. That is, each main surface 24a of the linear member 40 in the coil 10 faces in the axial direction. More specifically, the coil 10 in this embodiment is an edgewise coil formed by spirally shaping a flat wire. The radial direction of the coil 10 is the direction radiating from the axis of the coil 10 to the circumferential surface of the coil 10.

[0018] As described above, the axis of the coil 10 extends along the extending direction of the mounting surface on which the coil component 1 can be mounted. The axis of the coil 10 may be perfectly parallel to the extending direction of the mounting surface, or it may be slightly inclined with respect to that extending direction. More specifically, the extending direction of the axis of the coil 10 has a component in the extending direction of the mounting surface that is larger than the vertical component. Preferably, the axis of the coil 10 is parallel to the mounting surface. The mounting surface of the coil component 1 is the surface that is substantially parallel to the mounting substrate when the coil component 1 is mounted on the mounting substrate. When the coil component 1 is surface-mounted on the mounting substrate, the mounting surface of the coil component 1 is the region that makes surface contact with the mounting substrate at the terminal 30 (in this embodiment, the lower surface 30a of the terminal 30, which will be described later). Alternatively, if the terminal 30 is pin-shaped, the mounting surface of the coil component 1 is the lower surface of the coil component 1 (for example, the lower surface 60a of the base portion 60).

[0019] The lead-out sections 20 (first lead-out section 20a and second lead-out section 20b) are the respective ends of the linear member 40 drawn out from the circumferential surface of the coil 10. In other words, the lead-out sections 20 are the lead wires of the coil 10. Of the two ends of the lead-out section 20 in the direction of extension of the lead-out section 20, the end closer to the coil 10 is sometimes called the base end, and the end opposite to the base end is sometimes called the tip. As shown in Figure 3, in this embodiment, the lead-out section 20 is drawn out from the circumferential surface of the coil 10 in a tangential direction to the circumferential surface of the coil 10 at the base end of the lead-out section 20.

[0020] The coil component 1 of this embodiment has two terminals 30. Two lead portions 20, 20 are electrically connected to the two terminals 30, respectively. In this embodiment, the lead portions 20 are brazed to the terminals 30 by brazing material 70 (solder), but the lead portions 20 may be electrically connected to the terminals 30 by other methods such as welding. The terminals 30 are made of a conductive material such as metal. The terminals 30 of this embodiment are surface mount terminals that are connected by surface contact with the mounting substrate. Specifically, the terminals 30 have a lower surface 30a that faces the mounting substrate side (downward side). The coil component 1 is placed on the mounting substrate so that the lower surface 30a contacts the mounting substrate. Instead of this embodiment, the terminals 30 may be pin-shaped terminals. The terminals 30 of this embodiment are formed by bending a plate-shaped conductive material. Specifically, the terminals 30 are formed in a horizontal U-shape and sandwich the base portion 60, which will be described later, in the vertical direction. Alternatively, terminal 30 may be a terminal of another shape, such as a gull-wing type.

[0021] The coil component 1 of this embodiment further includes a core 50. At least a portion of the core 50 (the middle leg) is positioned on the inner diameter side of the coil 10. The core 50 is made of a magnetic material. The core 50 of this embodiment is composed of two cores (a first core 51 and a second core 52) combined. The middle leg of the core 50 is inserted into the inside of the coil 10, and a portion of the core 50 covers the circumferential surface of the coil 10. Alternatively, the coil component 1 may not include the core 50.

[0022] The coil component 1 of this embodiment further comprises a base portion 60. The base portion 60 is a member that holds the core. The base portion 60 holding the core 50 means that the base portion 60 is fixed to the core 50 such that the position of the core 50 relative to the base portion 60 is within a predetermined range. In this embodiment, the core 50 is housed inside the base portion 60 and holds the core 50. Alternatively, the core 50 may be fixed and held to the base portion 60 by an adhesive or the like, or it may be held to the base portion 60 by other methods such as engagement. The base portion 60 of this embodiment has a bottom surface and side surfaces that rise from the bottom surface, and the bottom surface, back surface, left surface, and right surface of the core 50 are covered by the bottom surface and side surfaces of the base portion 60. In this embodiment, the base portion 60 opens to the side (towards the front). Furthermore, the base portion 60 of this embodiment has a retaining portion 62 for locking the core 50 in the opening that opens to the side. Since the retaining portion 62 overlaps with the core 50 in the front-rear direction, it prevents the core 50 from shifting toward the opening side (front side) of the base portion 60 relative to the base portion 60. In particular, the retaining portion 62 facilitates the positioning of the core 50 and coil 10 on the base portion 60 when attaching the core 50 and coil 10 to the base portion 60 during the manufacturing process of the coil component 1.

[0023] In this embodiment, the two terminals 30 are attached to the base portion 60. In other words, the terminals 30 are fixed to the base portion 60. Specifically, as described above, the terminals 30 are formed in a horizontal U-shape, and the terminals 30 are attached to the base portion 60 by clamping the front end of the bottom surface of the base portion 60 in an up-and-down direction. In other words, the terminals 30 are engaged with a part of the base portion 60. Alternatively, the terminals 30 may be attached to the base portion 60 by embedding them in the base portion 60 or the like.

[0024] As shown in Figure 2, in this embodiment, as described above, at least a portion of the length region of each of the two lead-out sections 20 is the first region 22. The first region 22 extends in a predetermined lead-out direction. The lead-out direction is a direction having both an extending direction component of the mounting surface and a radial component of the coil 10. The first region 22 may be a portion of the length region on the base end side of the lead-out section 20, a portion of the length region on the tip side, or a length region in the middle of the length of the lead-out section 20. In this embodiment, the first region 22 of both the first lead-out section 20a and the second lead-out section 20b is a portion of the length region on the base end side. That is, the first lead-out section 20a and the second lead-out section 20b are drawn out in the lead-out direction from the circumferential surface of the coil 10. The lead-out direction is a direction having both an extending direction (lateral direction) component of the mounting surface and a radial component of the coil 10. Here, the statement that the draw direction has a radial component of the coil 10 means that the draw direction has a component in one of the radial directions of the coil 10 (multiple directions radiating from the axis of the coil 10 to the circumferential surface). In this embodiment, the draw direction has a component in one of the radial directions of the coil 10, specifically, a component in the direction moving forward from the axis of the coil 10 to the circumferential surface of the coil 10. Since all radial directions of the coil 10 are perpendicular to the axial direction of the coil 10, it can also be said that the draw direction has a component perpendicular to the axial direction of the coil 10. It is preferable that the draw direction has a lateral component that is larger than the vertical component. More preferably, the draw direction is a direction along the extending direction of the mounting surface (a direction substantially parallel to the extending direction of the mounting surface).

[0025] In this embodiment, the pulling direction of the pull-out section 20 is from rear to front. Specifically, the first region 22 of the pull-out section 20 is pulled out from the base end to the tip in a direction from rear to front. Also, in this embodiment, the pulling directions of the first regions 22 of the first pull-out section 20a and the second pull-out section 20b are the same. Alternatively, the pulling directions of the first regions 22 of the first pull-out section 20a and the second pull-out section 20b may be different from each other.

[0026] In this embodiment, the first lead portion 20a is drawn out from the circumferential surface of the coil 10 in the lead direction from the base end to the tip, bent in the plane and hanging downward. That is, a portion of the tip side of the first lead portion 20a extends in the vertical direction.

[0027] In this embodiment, each of the two terminals 30 is located on one side (front side) of the coil 10 in the first direction. The first direction is the direction along the mounting surface and perpendicular to the axis. In this embodiment, the front-to-back direction is the first direction. Each first region 22 of the two lead-out portions 20 is drawn out from the base end to the tip of the coil 10 toward one side (front side) in the first direction. With the above configuration, when the coil component 1 is viewed from the side (especially from the front), the two terminals 30 can be seen simultaneously. Therefore, especially in the manufacturing process of the coil component 1, it is easy to check whether the connection between the lead-out portion 20 and the terminal 30 by the brazing material 70 is good by visual inspection by a person or observation by a camera. This makes it easy to ensure a good connection between the lead-out portion 20 and the terminal 30 in the coil component 1. In this embodiment, as shown in Figure 4, the shape of the coil component 1 in plan view (view from above) is rectangular. In other words, the coil component 1 has four sides. The two terminals 30 in this embodiment are arranged side by side on the same side. In other words, the two terminals 30 of this embodiment are arranged side by side in the left-right direction on the front surface of the coil component 1 (a virtual surface defining the front side of the coil component 1).

[0028] As shown in Figure 2, in this embodiment, each of the two lead-out sections 20 includes a connection section 24, which is a portion of the length that connects to the terminal 30. In this embodiment, the connection section 24 is the tip of the lead-out section 20. The connection section 24 has a main surface 24a. The main surface 24a of the connection section 24 is a part of the main surface of a linear member 40 having a flattened cross-sectional shape. The connection section 24 is upright such that its main surface 24a intersects the mounting surface. That is, the connection section 24 extends in a direction having a vertical component. The connection section 24 has a vertical component that is larger than the component in the direction along the mounting surface (lateral component). Preferably, the connection section 24 is perpendicular to the mounting surface. As shown in Figure 6, in this embodiment, the main surface 24a of the connection section 24 in one lead-out section 20 overlaps with the main surface 24a of the connection section 24 in the other lead-out section 20 in the axial direction. In other words, the main surface 24a at the tip of the first lead portion 20a overlaps axially with the main surface 24a at the tip of the second lead portion 20b. When the connection region 24 is positioned upright so as to intersect the mounting surface, the linear member 40 can elastically recover better when a vertical force is applied to the connection region 24 from the terminal 30 due to vibration or the like, compared to when the connection region 24 is positioned along the mounting surface. When the connection region 24 is positioned along the mounting surface, the connection region 24 is prone to plastic deformation, bending into the plane of the main surface 24a when a vertical force is applied. On the other hand, when the connection region 24 is positioned upright so as to intersect the mounting surface, when the connection region 24 receives a vertical force, the connection region 24 can transmit the force to the entire linear member 40 (especially to the loop portion of the coil 10) without bending itself. As a result, the linear member 40 can have good elastic recovery force. Furthermore, because the connection areas 24 of both lead-out sections 20, 20 are upright, the two lead-out sections 20, 20 can be positioned closer together compared to the case where the connection areas 24 of the lead-out sections 20 are arranged substantially parallel to the mounting surface. As a result, the areas on the mounting board where the two terminals 30 are connected can be contained within a smaller area on the mounting board. Therefore, the degree of freedom in designing the wiring on the mounting board can be increased.

[0029] In this embodiment, as shown in Figure 5, the connection region 24 is brazed to the base end 32 of the terminal 30 by brazing material 70. The base end 32 of the terminal 30 is a part of the terminal 30 that includes one end connected to the lead-out portion 20. In contrast, a part of the terminal 30 that includes one end connected to the mounting substrate (a part including the lower surface 30a of the terminal 30) is sometimes called the tip of the terminal 30. The base end 32 of the terminal 30 includes a connection portion 32a having a first surface 32b that is connected to the connection region 24. The first surface 32b extends along the mounting surface (the lower surface 30a of the terminal 30). The connection portion 32a is a part whose main surface is the first surface 32b. In this embodiment, the connection portion 32a is a plate-like portion located on the upper surface of the bottom surface of the base portion 60. The connection region 24 is located on the side (upper side) that is further away from the mounting surface than the first surface 32b in the orthogonal direction (up and down direction), which is perpendicular to the mounting surface. The lower end of the connection region 24 may be in contact with the first surface 32b or may be spaced apart from the first surface 32b. The brazing material 70 is piled up on the first surface 32b, electrically connecting the connection region 24 located on the first surface 32b to the first surface 32b (connection portion 32a). As described above, because the connection region 24 is positioned upright on the first surface 32b of the terminal 30, it is easier to ensure the connection between the connection region 24 and the terminal 30 by the brazing material 70 compared to the case where the main surface 24a of the connection region 24 is positioned parallel to the first surface 32b and brazed to the first surface 32b. This is because, in the manufacturing process of the coil component 1, when the vicinity of the brazing material 70 is observed from the side or above of the coil component 1 by visual inspection by a person or observation by a camera, it is easy to confirm whether the connection region 24 (especially the main surface 24a) and the terminal 30 (especially the first surface 32b) are connected by the brazing material 70.

[0030] In this embodiment, as shown in Figure 6, the main surface 24a of the linear member 40 (especially the lead portion 20) intersects the first surface 32b (see Figure 5) from the base end to the tip (extends in the vertical direction). In other words, the main surface 24a of the linear member 40 (especially the lead portion 20) intersects the mounting surface from the base end to the tip. In other words, the main surface 24a over the entire length of the lead portion 20 extends in the vertical direction. As a result, compared to the case where the main surface 24a over a portion of the length of the linear member 40 is aligned with the first surface 32b (mounting surface), when a vertical force is applied to the connection region 24 of the lead portion 20 from the terminal 30, the lead portion 20 is less likely to be bent midway by the force, and the force can be transmitted to the entire linear member 40 (especially up to the loop portion of the coil 10). As a result, the linear member 40 has better elastic restoring force. Furthermore, in this embodiment, even if the linear member 40 (especially the extension portion 20) is locally curved from the tip to the base, the curve is within the plane of the main surface 24a of the linear member 40. Specifically, in this embodiment, there are no locations where the linear member 40 is deformed by bending or twisting the main surface 24a of the linear member 40. Because the main surface 24a of the linear member 40 extends to the first surface 32b from the base to the tip in this way, the linear member 40 is not deformed by twisting the main surface 24a, for example, and the strength of the linear member 40 can be maintained at a high level. Alternatively, the linear member 40 (especially the extension portion 20) may be twisted in the middle and the connection region 24 may be arranged so that the main surface 24a of the connection region 24 is parallel to the first surface 32b.

[0031] In this embodiment, as shown in Figure 4, a portion of the base end portion 32 of the terminal 30 includes a locking portion 32c that is positioned to sandwich the connection region 24 in the axial direction. The locking portion 32c is a part of the terminal 30, and in this embodiment, the locking portion 32c is also made of a conductive material. Specifically, the locking portion 32c is positioned to sandwich the connection region 24 in the thickness direction of the connection region 24. More specifically, the locking portion 32c has a concave shape (U-shape), and the connection region 24 is positioned inside this concave shape. The locking portion 32c overlaps with both main surfaces 24a of the connection region 24 and the coil 10 in the axial direction. The aforementioned locking portion 32c can maintain the orientation of the connection region 24 so that the connection region 24 remains upright relative to the first surface 32b. For example, even if the connection region 24 starts to tilt from an upright position relative to the first surface 32b, the locking portion 32c can lock the connection region 24 so that it does not tilt. In this embodiment, the locking portion 32c is spaced apart from the connection region 24, and there is a gap between the locking portion 32c and the main surface 24a of the connection region 24. The brazing material 70 may be filled into this gap. This makes the connection between the terminal 30 and the connection region 24 more robust. Alternatively, the locking portion 32c may crimp and clamp the connection region 24.

[0032] <Second Embodiment> Figure 7 is a perspective view showing an example of a coil component 1 according to this embodiment. First, an overview of the coil component 1 of this embodiment will be described. In this embodiment, the contents that are common to the first embodiment will be omitted as appropriate.

[0033] The coil component 1 of this embodiment is characterized in that, similar to the first embodiment, the first region 22 of the lead-out portions 20, 20 extends in a predetermined lead-out direction.

[0034] Next, the coil component 1 of this embodiment will be described in detail. The coil component 1 of this embodiment is similar to the first embodiment in that a portion of the tip side of each of the two lead portions 20, 20 extends in a predetermined lead direction, and differs from the first embodiment in that the length regions of the two lead portions 20, 20 that share a common extending direction overlap in the axial direction.

[0035] In this embodiment, each of the first regions 22 in the two lead-out sections 20, 20 is connected to the terminal 30 at its end. That is, the first regions 22 of both lead-out sections 20, 20 are length regions that include the tip of the lead-out section 20. The first region 22 has a main surface 24a, and as described in the first embodiment, the main surface 24a is upright so as to intersect the mounting surface. The main surface 24a of at least a portion of the length region of the first region 22 in one lead-out section 20 (first lead-out section 20a) that is closer to the base end than the end (specifically, one connection region 24) overlaps axially with the main surface 24a of at least a portion of the length region of the first region 22 in the other lead-out section 20 (second lead-out section 20b) that is closer to the base end than the end (specifically, the other connection region 24). Thus, the tips of both lead portions 20, 20 extend in a first region 22 in a predetermined lead direction, and this first region 22 is connected to the terminal 30. As a result, even when the coil component 1 is subjected to an external force from the mounting substrate in a direction having a component normal to the surface of the mounting substrate, the springiness of the linear member 40 prevents the tips of the lead portions 20 from separating significantly from the terminal 30. Furthermore, because the first region 22, including the tips, is upright, the two lead portions 20, 20 can be positioned closer together compared to the case where the connection region 24 of the lead portions 20 is arranged substantially parallel to the mounting surface. This allows the areas on the mounting substrate where the two terminals 30 are connected to each other to be contained within a small area on the mounting substrate. Therefore, the degree of freedom in designing the wiring on the mounting substrate can be increased.

[0036] In this embodiment, the first pull-out portion 20a is pulled downward from the circumferential surface of the coil 10 (particularly the front side), and then bent in an L-shape toward the front within the plane of the main surface 24a of the linear member 40 and pulled forward. The first region of the first pull-out portion 20a in this embodiment is the length region from the bent portion that bends in an L-shape to the tip. In this embodiment, the second pull-out portion 20b is pulled forward from the circumferential surface of the coil 10 (particularly the lower side). In this embodiment, the second pull-out portion 20b is bent at a two-stage bend portion 26, which will be described later. The length region of the second pull-out portion 20b from the two-stage bend portion 26 to the tip extends in the front-rear direction. The first region 22 of the second pull-out portion 20b in this embodiment is the length region from the two-stage bend portion 26 to the tip.

[0037] In this embodiment, as shown in Figure 9(b), the distance L1 between the two connection regions 24 in the axial direction is smaller than the dimension L2 of the coil 10 in the axial direction. Here, the distance between the two connection regions 24 is the distance in the axial direction between the main surface 24a facing outward in the axial direction in one connection region 24 and the main surface 24a facing outward in the axial direction in the other connection region 24. In other words, it is the distance in the axial direction between the main surface 24a facing left (lower side in Figure 9(b)) in the first drawer portion 20a and the main surface 24a facing right (upper side in Figure 9(b)) in the second drawer portion 20b. Furthermore, as shown in Figure 8 in this embodiment, the central position between the two connection regions 24 in the axial direction (the position indicated by the dashed line B) is shifted to one side (left or right) in the axial direction compared to the central position of the coil component 1 in the axial direction (the position indicated by the dashed line A). In this embodiment, the central position between the two connection regions in the axial direction is shifted to the left compared to the central position of the coil component in the axial direction. The central position of the coil component 1 in the axial direction is the central position of the outermost ends of the coil component 1 in the axial direction. In this embodiment, the center of the coil component 1 in the axial direction is the center between the left side surface of the base portion 60 and the right side surface of the base portion 60. The central position between the two connection regions 24 in the axial direction is the central position between the outermost parts of each connection region 24 in the axial direction. With the above configuration, the two connection regions 24 are positioned close to each other in the axial direction, and are also positioned to one side in the axial direction. This allows the areas on the mounting board where the two terminals 30 are connected to each other to be contained within a small area on the mounting board. This increases the design flexibility of the wiring on the mounting board. Furthermore, in this embodiment, the central position between the two connection areas 24 in the axial direction is shifted to one side in the axial direction compared to the central position of the core 50 in the axial direction.

[0038] In this embodiment, as shown in Figure 9(b), the connection region 24 of at least one of the pull-out sections 20 (second pull-out section 20b) is positioned on the other side (left side) in the axial direction of the coil 10, relative to the outer surface (right end surface) on one side of the coil 10 in the axial direction. As a result, as described above, the separation distance L1 is smaller than the dimension L2, and the central position between the two connection regions in the axial direction is shifted to the left of the central position of the coil component in the axial direction. Specifically, the second pull-out section 20b has a two-stage bending section 26 and is bent in two stages, so that the connection region 24 of the second pull-out section 20b is positioned to the left of the right end surface of the coil 10. More specifically, the second pull-out section 20b, which is pulled forward from the circumferential surface of the coil 10, is bent inward (left side) in the axial direction, and then bent forward again.

[0039] In this embodiment, as shown in Figure 8, the locking portion 32c of the terminal 30 is arranged to sandwich the connection region 24 in the axial direction. Specifically, the base end portion 32 of the terminal 30 includes side portions 32d that extend from each end of the connection portion 32a in the axial direction toward the side away from the mounting surface (upward side) in the orthogonal direction (upper and lower direction). For this reason, the base end portion 32 is formed in a concave shape with an opening on the side away from the mounting surface (upward side) in the orthogonal direction. The connection region 24 and the brazing material 70 that brazes the connection region 24 and the terminal 30 are arranged inside the concave shape. In other words, the pair of side portions 32d sandwich the connection region 24 in the axial direction as the locking portion 32c, and the brazing material 70 is arranged between the pair of side portions 32d. With the above configuration, in the manufacturing process of the coil component 1, it becomes easy to confirm from the side or above of the coil component 1 whether the brazing material 70 is in contact with the side portion 32d and the connection area 24 (especially the main surface 24a) by visual inspection by a person or observation by a camera. As a result, the connection between the connection area 24, which is positioned upright relative to the first surface 32b of the terminal 30, and the terminal 30 is well ensured in the coil component 1. Furthermore, because the locking portion 32c has a concave shape that opens upward, the brazing material 70 can accumulate inside the concave shape, allowing for a good connection between the terminal 30 and the connection area 24. In this embodiment, the brazing material 70 is positioned between the main surface 24a and the side portion 32d of the connection area 24. The brazing material 70 is also positioned between the end face of the connection area 24 and the first surface 32b.

[0040] It should be noted that the present invention is not limited to the embodiments described above, and includes various modifications, improvements, and other forms as long as the objectives of the present invention are achieved.

[0041] The above embodiment encompasses the following technical concept: (1) A coil component having a coil which is a linear member formed in a spiral shape, lead portions which are the ends of the linear member drawn out from the circumferential surface of the coil, and terminals which are electrically connected to the lead portions, wherein the axis of the coil extends along the extending direction of the mounting surface on which the coil component can be mounted, the dimensions of the linear member in the radial direction of the coil are greater than the dimensions of the linear member in the axial direction of the coil, and the first region which is at least a portion of the length of each of the two lead portions extends in the lead direction having the extending direction component of the mounting surface and the radial direction component of the coil. (2) The coil component according to (1), further comprising a core disposed on the inner diameter side of the coil and a base portion holding the core, wherein the two terminals to which the two lead portions are electrically connected are attached to the base portion and are located on one side of the coil in a first direction which is in a direction along the mounting surface and perpendicular to the axis, and the first region of each of the two lead portions is drawn out from the coil toward the one side in the first direction. (3) The coil component according to (2), wherein each of the two lead portions includes a connection region which is a portion of the length region connected to the terminal, the connection region has a main surface which is upright so as to intersect the mounting surface, and the main surface of the connection region in one lead portion overlaps with the main surface of the connection region in the other lead portion in the axial direction. (4) The coil component according to (2) or (3), wherein each of the two lead-out portions of the first region is connected to the terminal at its end, the first region has a main surface which is upright and intersects the mounting surface, and the main surface of at least a portion of the length of the first region of one of the lead-out portions that is closer to the base end than the end overlaps in the axial direction with the main surface of at least a portion of the length of the first region of the other lead-out portion that is closer to the base end than the end.(5) The coil component according to any one of (1) to (4), wherein each of the two lead-out portions includes a connection region which is a portion of the length of the terminal, the connection region is brazed to the base end of the terminal, the base end includes a connection portion having a first surface connected to the connection region, the first surface extending along the mounting surface, the connection region has a main surface which is upright so as to intersect the first surface, and is positioned further away from the mounting surface than the first surface in an orthogonal direction which is perpendicular to the mounting surface. (5-1) The coil component according to (5), wherein the main surface of the lead-out portion intersects the first surface from the base end to the tip. (6) The coil component according to (5), wherein a portion of the base end includes a locking portion which is positioned to sandwich the connection region in the axial direction. (6-1) The coil component according to (6), wherein the locking portion is spaced apart from the connection region in the axial direction, and a brazing material is placed between the locking portion and the connection region. (7) The coil component according to (6), wherein the base end is formed in a concave shape with an opening on the side away from the mounting surface in the orthogonal direction, including side portions extending from each end of the connection portion in the axial direction toward the side away from the mounting surface in the orthogonal direction, and the connection region and the brazing material for brazing the connection region and the terminal are arranged inside the concave shape. (8) The coil component according to any one of (1) to (7), wherein each of the two lead portions includes a connection region which is a portion of the length region connected to the terminal, the distance between the two connection regions in the axial direction is smaller than the dimension of the coil in the axial direction, and the position of the center between the two connection regions in the axial direction is shifted to one side in the axial direction from the center of the coil component in the axial direction.

Claims

1. A coil component comprising: a coil which is a linear member formed in a spiral shape; lead portions which are the respective ends of the linear member drawn out from the circumferential surface of the coil; and terminals electrically connected to the lead portions, wherein the axis of the coil extends along the extending direction of the mounting surface on which the coil component can be mounted; the dimensions of the linear member in the radial direction of the coil are greater than the dimensions of the linear member in the axial direction of the coil; and a first region which is at least a portion of the length of each of the two lead portions extends in the lead direction having the extending direction component of the mounting surface and the radial direction component of the coil.

2. The coil component according to claim 1, further comprising a core disposed on the inner diameter side of the coil, and a base portion holding the core, wherein two terminals to which the two lead portions are electrically connected are attached to the base portion and are located on one side of the coil in a first direction which is in a direction along the mounting surface and perpendicular to the axis, and each of the first regions of the two lead portions is drawn out from the coil toward the one side in the first direction.

3. The coil component according to claim 2, wherein each of the two lead-out portions includes a connection region which is a portion of the length of the connection region connected to the terminal, the connection region having a main surface which is upright and intersects the mounting surface, and the main surface of the connection region in one lead-out portion overlaps with the main surface of the connection region in the other lead-out portion in the axial direction.

4. The coil component according to claim 2 or 3, wherein each of the two lead-out portions is connected to the terminal at its end, the first region has a main surface which is upright and intersects the mounting surface, and the main surface of at least a portion of the length of the first region of one lead-out portion that is closer to the base end than the end overlaps in the axial direction with the main surface of at least a portion of the length of the first region of the other lead-out portion that is closer to the base end than the end.

5. The coil component according to any one of claims 1 to 4, wherein each of the two lead-out portions includes a connection region which is a portion of the length of the terminal, the connection region is brazed to the base end of the terminal, the base end includes a connection portion having a first surface connected to the connection region, the first surface extends along the mounting surface, the connection region has a main surface which is upright such that the main surface intersects the first surface, and is positioned further away from the mounting surface than the first surface in an orthogonal direction which is perpendicular to the mounting surface.

6. The coil component according to claim 5, wherein a portion of the base end includes a locking portion arranged to sandwich the connection region in the axial direction.

7. The coil component according to claim 6, wherein the base end is formed in a concave shape with an opening on the side away from the mounting surface in the orthogonal direction, including side portions extending from each end of the connection portion in the axial direction toward the side away from the mounting surface in the orthogonal direction, and the connection region and the brazing material for brazing the connection region and the terminal are arranged inside the concave shape.

8. The coil component according to any one of claims 1 to 7, wherein each of the two extensions includes a connection region which is a portion of the length region connected to the terminal, the distance between the two connection regions in the axial direction is smaller than the dimensions of the coil in the axial direction, and the position of the center between the two connection regions in the axial direction is shifted to one side in the axial direction from the center of the coil component in the axial direction.

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