Coil component

Abstract

Provided is a coil component that makes it easier to distinguish gestures. A coil component (10) is provided with a drum-shaped core (10C) as a first core, a plate-shaped core (10F) as a second core, and a wire (50). The drum-shaped core (10C) has a columnar winding core part (11), a first flange part (21) connected to a first end of the winding core part (11) in the direction along the central axis (C), and a second flange part (22) connected to a second end of the winding core part (11) on the opposite side to the first end. The plate-shaped core (10F) has a plate shape having a first main surface (M1). The first main surface (M1) is connected to the first flange section (21) and the second flange section (22). The plate-shaped core (10F) has, on the opposite side from the first main surface (M1), a second main surface (M2) parallel to the first main surface (M1), and an inclined plane (33) inclined with respect to the second main surface (M2).

Description

Technical Field

[0001] The present disclosure relates to coil components. Background Art

[0002] The coil component described in Patent Document 1 includes a drum-shaped core, two external electrodes, a wire rod, and a plate-shaped core. The drum-shaped core includes a winding core portion, a first flange portion, and a second flange portion. The winding core portion is in the shape of a quadrangular prism. The first flange portion is connected to the first end of the winding core portion. The second flange portion is connected to the second end of the winding core portion. An external electrode is installed on each flange portion. The wire rod is wound around the winding core portion. The first end of the wire rod is connected to the external electrode on the first flange portion side. The second end of the wire rod is connected to the external electrode on the second flange portion side.

[0003] The plate-like core is connected to the end surface of the first flange portion on the side opposite to the portion where the external electrode is located. In addition, the plate-like core is connected to the end surface of the second flange portion on the side opposite to the portion where the external electrode is located. That is, the plate-like core is bridged between the first flange portion and the second flange portion.

[0004] The plate-like core has two recesses on the outer surface opposite to the surface connected to the first flange and the second flange in the surface of the plate-like core. Each recess is recessed relative to the outer surface and is a truncated cone-shaped recess.

[0005] Patent Document 1: Japanese Patent No. 6672614

[0006] For the coil component described in Patent Document 1, the posture of the coil component can be identified by observing the recessed portion of the planar core. For example, the planar core is photographed from a position facing the outer side surface of the planar core. And, based on the positional relationship between the two recessed portions in the photographed image, the posture of the coil component can be identified. However, the premise of this method is that it is possible to clearly distinguish in the photographed image the portion where the recessed portion exists on the surface of the planar core and the outer side surface where the recessed portion does not exist on the surface of the planar core. Therefore, as a device for photographing the outer side surface of the planar core, a high-definition photographing device may be required. Summary of the invention

[0007] In order to solve the above-mentioned problems, the present invention is a coil component, comprising: a first core, which has a columnar winding core portion, a first flange portion connected to the first end of the above-mentioned winding core portion in the direction along the central axis, and a second flange portion connected to the second end of the above-mentioned winding core portion on the opposite side of the above-mentioned first end; a plate-shaped second core, which has a first main surface; and a wire material, which is wound on the above-mentioned winding core portion, the above-mentioned first main surface is connected to the above-mentioned first flange portion and the above-mentioned second flange portion, and the above-mentioned second core has, on the side opposite to the above-mentioned first main surface: a second main surface parallel to the above-mentioned first main surface and an inclined plane inclined relative to the second main surface.

[0008] According to the above configuration, it is easier to distinguish the posture of the coil component. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional diagram of the coil component.

[0010] Figure 2 is a side view of the coil component.

[0011] Figure 3 It is a top view of the coil component.

[0012] Figure 4 This is an explanatory diagram for explaining the reflection of light when light is irradiated onto the plate-like core of the coil component and an image is taken.

[0013] Figure 5 It is a diagram showing a coil component according to a modified example.

[0014] Figure 6 It is a diagram showing a coil component according to a modified example.

[0015] Description of Reference Numerals

[0016] C...center axis; M1...first main surface; M2...second main surface; W...angle; 10...coil component; 10C...drum-shaped core; 10F...plate-shaped core; 11...winding core portion; 21...first flange portion; 22...second flange portion; 30...recessed portion; 31...opening edge; 32...bottom surface; 33...inclined plane; 50...wire material. DETAILED DESCRIPTION

[0017] Hereinafter, an embodiment of the coil component will be described with reference to the accompanying drawings. In addition, the accompanying drawings sometimes enlarge the structural elements for easy understanding. As for the dimensional ratio of the structural elements, there are cases where it is different from the actual situation or the dimensional ratio in other drawings.

[0018] <Overall structure>

[0019] like Figure 1 As shown, the coil component 10 includes a drum-shaped core 10C as a first core and a plate-shaped core 10F as a second core.

[0020] The drum-shaped core 10C includes a columnar winding core portion 11 , a first flange portion 21 , and a second flange portion 22 .

[0021] The core portion 11 is in the shape of a quadrangular prism. Therefore, the core portion 11 extends along the central axis C. When viewed in section at right angles to the central axis C, the shape of the core portion 11 is a rectangle. In addition, the "rectangle" mentioned here only needs to have four sides and be a rectangle as a whole, and also includes a shape in which the corners of the rectangle are chamfered. The material of the core portion 11 is a magnetic material. Specifically, the material of the core portion 11 can be, for example, a Ni-Zn ferrite or a mixture of Ni-Zn ferrites.

[0022] Here, a specific axis parallel to the central axis C of the core portion 11 is referred to as the first axis X. An axis orthogonal to the first axis X is referred to as the second axis Y. In the present embodiment, when viewed in the direction along the first axis X, the second axis Y is parallel to two of the four sides of the core portion 11. In addition, an axis orthogonal to both the first axis X and the second axis Y is referred to as the third axis Z. In the present embodiment, when viewed in the direction along the first axis X, the third axis Z is parallel to the remaining two of the four sides of the core portion 11. Furthermore, one of the directions (one direction) along the first axis X is referred to as the first positive direction X1, and the direction opposite to the first positive direction X1 is referred to as the first negative direction X2. Similarly, one of the directions (one direction) along the second axis Y is referred to as the second positive direction Y1, and the direction opposite to the second positive direction Y1 is referred to as the second negative direction Y2. Furthermore, one of the directions (one direction) along the third axis line Z is referred to as a third positive direction Z1 , and the direction opposite to the third positive direction Z1 is referred to as a third negative direction Z2 .

[0023] like Figure 1 As shown, the first flange portion 21 is connected to the first end of the core portion 11 in the direction along the central axis C. Specifically, the first flange portion 21 is connected to the end of the first positive direction X1 of the core portion 11, that is, the first end. The first flange portion 21 is an integrally formed product integral with the core portion 11. Therefore, the material of the first flange portion 21 is the same magnetic material as that of the core portion 11. In the direction along the second axis Y and the direction along the third axis Z, the first flange portion 21 extends outward relative to the outer peripheral surface of the core portion 11.

[0024] The second flange portion 22 is connected to the second end of the winding core portion 11 on the opposite side to the first end. In other words, it is connected to the end portion of the winding core portion 11 on the first negative direction X2 side, that is, the second end. The second flange portion 22 is an integrally formed part with the winding core portion 11. Therefore, the material of the second flange portion 22 is the same magnetic material as that of the winding core portion 11.

[0025] The plate-like core 10F is in the shape of a rectangular plate. The dimension of the plate-like core 10F in the direction along the first axis X is slightly larger than the dimension of the drum-shaped core 10C in the direction along the first axis X. In addition, the dimension of the plate-like core 10F in the direction along the second axis Y is slightly larger than the dimension of the drum-shaped core 10C in the direction along the second axis Y. The dimension of the plate-like core 10F in the direction along the third axis Z is smaller than the dimension of the plate-like core 10F in the direction along the first axis X and the dimension of the plate-like core 10F in the direction along the second axis Y. The long side of the plate-like core 10F is parallel to the first axis X. The short side of the plate-like core 10F is parallel to the second axis Y.

[0026] The plate-like core 10F is located on the third negative direction Z2 side relative to the drum-shaped core 10C. The plate-like core 10F is connected to both the surface of the first flange portion 21 facing the third negative direction Z2 and the surface of the second flange portion 22 facing the third negative direction Z2. In other words, the plate-like core 10F is mounted on the first flange portion 21 and the second flange portion 22. When viewed from above in the direction along the third axis Z, an imaginary line that divides the plate-like core 10F into two in the direction along the second axis Y is aligned with the central axis C of the winding core portion 11. The material of the plate-like core 10F is the same magnetic material as that of the drum-shaped core 10C.

[0027] The coil component 10 includes a first external electrode 41 and a second external electrode 42. The first external electrode 41 covers the entire surface of the first flange portion 21 that faces the third positive direction Z1. Although not shown in the figure, the first external electrode 41 has a metal layer and a plating layer. The material of the metal layer is silver. The metal layer is stacked on the surface of the first flange portion 21. The plating layer is composed of three layers stacked on the surface of the metal layer. The plating layer is stacked in the order of copper, nickel, and tin from the metal layer side.

[0028] The second external electrode 42 covers the entire surface of the second flange portion 22 that faces the third positive direction Z1. The second external electrode 42 has the same structure as the first external electrode 41. That is, the second external electrode 42 has a metal layer and a three-layer plating layer.

[0029] Furthermore, the end surface of the coil component 10 on the third positive direction Z1 side where the first external electrode 41 and the second external electrode 42 are located is a mounting surface facing the substrate when the coil component 10 is mounted on the substrate.

[0030] like Figure 1 As shown, the coil component 10 includes a wire 50 wound on a winding core 11. Although not shown, the wire 50 includes a copper wire and an insulating film. The insulating film covers the outer surface of the copper wire. When the wire 50 is cut through a section perpendicular to the direction in which the wire 50 extends, the shape of the wire 50 is approximately circular.

[0031] like Figure 2 As shown, the first end 50A of the wire 50 is connected to the first external electrode 41. The second end 50B of the wire 50 is connected to the second external electrode 42. The wire 50 is wound around the winding core 11 in a counterclockwise direction from the first end 50A side to the second end 50B side when viewed in the first negative direction X2.

[0032] <Concave portion of plate-shaped core>

[0033] like Figure 2 As shown, the plate-like core 10F is a plate-like having a first main surface M1. The first main surface M1 is connected to the first flange portion 21 and the second flange portion 22. In addition, the plate-like core 10F has a second main surface M2 parallel to the first main surface M1 on the side opposite to the first main surface M1. In addition, the "parallel" mentioned here refers to parallelism that allows slight misalignment due to manufacturing errors, etc. The first main surface M1 and the second main surface M2 are rectangles with long sides along the direction of the first axis X. In addition, the first main surface M1 and the second main surface M2 are both orthogonal to the third axis Z.

[0034] like Figure 1 As shown in FIG. 1 , the plate-like core 10F has two recesses 30 that are recessed relative to the second main surface M2. The two recesses 30 have the same shape, so the shape will be described using one recess 30 as a representative. The recess 30 is a quadrangular pyramid-shaped recess. Figure 3 As shown, when viewed in a direction orthogonal to the second main surface M2, the opening edge 31 of the recess 30 is a rectangle. In the present embodiment, the opening edge 31 of the recess 30 is a rectangle whose long sides are in the direction along the first axis X. That is, the two long sides of the opening edge 31 of the recess 30 are parallel to the first axis X. The two short sides of the opening edge 31 of the recess 30 are parallel to the second axis Y.

[0035] The recessed portion 30 has a bottom surface 32 and four inclined planes 33. That is, the plate-like core 10F has inclined planes 33. The shape of the bottom surface 32 is similar to the opening edge 31 of the recessed portion 30, and is smaller than the opening edge 31. That is, when viewed in a direction orthogonal to the second main surface M2, the bottom surface 32 is a rectangle whose long sides are in the direction along the first axis X.

[0036] Each inclined plane 33 extends from the second main surface M2 toward the bottom surface 32 of the recess 30. That is, the inclined plane 33 extends from each of the four sides of the rectangular opening edge 31 toward the bottom of the recess 30. Therefore, the plate-like core 10F has four inclined planes 33 for each recess 30. Moreover, the edge of each inclined plane 33 close to the bottom side of the recess 30 is connected to each side of the outer edge of the bottom surface 32.

[0037] Here, a “flat surface” is sufficient as long as it can be observed as a flat surface when the plate-like core 10F is observed as a whole, and minute irregularities that cannot be observed without a microscope are ignored. Therefore, each inclined plane 33 does not include a curved surface that can be visually recognized when the plate-like core 10F is observed as a whole.

[0038] The inclined plane 33 is a side surface of the quadrangular pyramid-shaped recess 30. Therefore, the inclined plane 33 is inclined relative to the second main surface M2. In addition, the inclined plane 33 is inclined so that the closer it is to the bottom side of the recess 30, the closer it is to the face-to-face inclined plane 33. Figure 4 As shown, an imaginary plane VP including the second main surface M2 is assumed. At this time, the angle formed by the imaginary plane VP and the inclined plane 33, that is, the angle W of the inner side of the recess 30 is greater than 10 degrees and less than 80 degrees, preferably greater than 35 degrees and less than 55 degrees. Specifically, in this embodiment, the above-mentioned angle W is about 45 degrees.

[0039] like Figure 3 As shown, when viewed in a direction perpendicular to the second main surface M2, each recess 30 is not located on the central axis C of the winding core 11. Not located on the central axis C means that the central axis C and the opening edge 31 of the recess 30 do not intersect.

[0040] like Figure 3 As shown, the second main surface M2 is equally divided into three regions arranged in a direction parallel to the second main surface M2 and orthogonal to the central axis C of the winding core 11. Moreover, from the second negative direction Y2 side toward the second positive direction Y1 side, the regions are sequentially set as the first region P1, the second region P2, and the third region P3. At this time, one of the recesses 30 is located in the first region P1. In addition, the remaining one of the recesses 30 is located in the third region P3. That is, each recess 30 is located in one of the two regions other than the central second region P2 among the three regions.

[0041] Furthermore, when viewed in a direction perpendicular to the second main surface M2, the positional relationship of the two recessed portions 30 is line symmetric with respect to the central axis C of the winding core 11. In other words, the two recessed portions 30 are in a mirror image relationship with the central axis C as a reference.

[0042] <Method of Identifying Coil Components According to the Present Embodiment>

[0043] like Figure 4 As shown, two light sources LS are used to irradiate light onto the second main surface M2. One light source LS is located on the second positive direction Y1 side and the third negative direction Z2 side relative to the second main surface M2. The other light source LS is located on the second negative direction Y2 side and the third negative direction Z2 side relative to the second main surface M2. Each light source LS irradiates light onto the second main surface M2 at an angle inclined relative to the second main surface M2.

[0044] For example, Figure 4 As shown, the light irradiated from the light source LS located on the second positive direction Y1 side and on the third negative direction Z2 side relative to the second main surface M2 is incident on the inclined plane 33 located in the second negative direction Y2 in the recess 30. In this case, on the one hand, the light reflected by the inclined plane 33 generally travels toward the third negative direction Z2. On the other hand, when the light irradiated from the light source LS is incident on the second main surface M2, the light reflected by the second main surface M2 is reflected at an angle inclined relative to the third negative direction Z2.

[0045] Similarly, light irradiated from the light source LS located on the second negative direction Y2 side and on the third negative direction Z2 side relative to the second main surface M2 is incident on the inclined plane 33 located on the second positive direction Y1 side in the recess 30. In this case, on the one hand, the light reflected by the inclined plane 33 travels generally toward the third negative direction Z2. On the other hand, when the light irradiated from the light source LS is incident on the second main surface M2, the light reflected by the second main surface M2 is reflected at an angle inclined relative to the third negative direction Z2.

[0046] Under such conditions, the second main surface M2 is photographed from the third negative direction Z2 side by the camera CMR. At this time, two inclined planes 33 located on the second positive direction Y1 side and the second negative direction Y2 side relative to the second main surface M2 can be photographed as areas with strong reflected light.

[0047] <Effects of the present embodiment>

[0048] (1) When the coil component 10 is irradiated with light from the light source LS, in many cases, it is not limited to being able to irradiate the light from directly above the coil component 10, but the light has to be irradiated at an angle even slightly inclined relative to the second main surface M2 of the plate-like core 10F. In the above embodiment, the plate-like core 10F has an inclined plane 33 inclined relative to the second main surface M2. As described above, when light is irradiated in a state inclined relative to the second main surface M2, compared with the second main surface M2, a certain inclined plane 33 can be photographed as a region with strong reflected light. That is, in the captured image, the contrast between a certain inclined plane 33 and the second main surface M2 becomes stronger. For example, when the image captured as described above is binarized, it is easy to perform image processing such that only two inclined planes 33 become bright parts and other parts become dark parts. Therefore, even without using high-precision imaging equipment, the posture of the coil component 10 can be identified based on the inclined plane 33.

[0049] (2) In the above embodiment, the inclined plane 33 is a side surface of the recess 30. Assuming that the inclined plane 33 protrudes from the second main surface M2 toward the third negative direction Z2 side, the height dimension of the coil component 10 when mounted on the substrate becomes larger by the amount of the inclined plane 33. According to the above structure, compared with the case where the inclined plane 33 protrudes from the second main surface M2, the height dimension of the coil component 10 caused by the inclined plane 33 can be suppressed.

[0050] (3) In the above embodiment, the inclined planes 33 extend from each of the four sides of the rectangular opening edge 31 in the recess 30. According to this structure, no matter from which inclined direction the coil component 10 is irradiated with light, any one of the four inclined planes 33 of the recess 30 can be observed as a region with strong reflected light.

[0051] (4) Assume that the angle formed by the imaginary plane VP and the inclined plane 33 and the angle W on the inner side of the recess 30 are close to 0 degrees, or close to 90 degrees. In this case, in order to increase the contrast between the inclined plane 33 and the second main surface M2 in the captured image, it is necessary to make the incident angle of light relative to the second main surface M2 extremely large or extremely small. In the above embodiment, the angle W is greater than 10 degrees and less than 80 degrees. If the angle W is within such a numerical range, even if the incident angle of light relative to the second main surface M2 is not an extreme angle, a difference in contrast between the inclined plane 33 and the second main surface M2 is obtained in the captured image. That is, the position of the light source LS is not easily restricted.

[0052] (5) Assume that when current is applied to the coil component 10, in the plate-like core 10F, the magnetic flux is concentrated on the central axis C of the winding core portion 11 when viewed in a direction perpendicular to the second main surface M2. In the above embodiment, the recess 30 is not located on the central axis C of the winding core portion 11 when viewed in a direction perpendicular to the second main surface M2. Therefore, according to the above structure, it is possible to suppress the reduction in the volume of the plate-like core 10F at the location where the magnetic flux is concentrated. That is, according to the above structure, it is possible to suppress the reduction in inductance in the coil component 10.

[0053] (6) In the above embodiment, the recess 30 is located in one of the two regions other than the second region P2 in the center of the three regions. That is, when viewed in a direction orthogonal to the second main surface M2, the recess 30 exists away from the region including the central axis C. Therefore, the above structure is a more preferred structure for suppressing the reduction of the inductance of the coil component 10.

[0054] (7) For example, when the inclined plane 33 of the recess 30 is not inclined at the designed angle relative to the second main surface M2 due to manufacturing errors, etc., there is a case where it is difficult to produce contrast between the second main surface M2 and the inclined plane 33 in the captured image. In the above embodiment, the plate-like core 10F has two recesses 30. In this way, there are a plurality of recesses 30, so that even if the inclined plane 33 in one recess 30 is difficult to produce contrast in the image, the inclined planes 33 of other recesses 30 can be recognized in the image.

[0055] (8) In the above embodiment, when viewed in a direction orthogonal to the second main surface M2, the positional relationship of the two recesses 30 is line symmetrical with respect to the central axis C of the winding core 11. According to this structure, the two recesses 30 exist in symmetrical positions, so that in the direction along the second axis Y, the center of gravity of the coil component 10 is not easily deviated to one side due to the presence of the recesses 30. Therefore, according to the above structure, it is possible to suppress the coil component 10 from tipping over when the coil component 10 is mounted on the substrate.

[0056] (9) In the above embodiment, the opening edge 31 of the recess 30 is a rectangle whose long side is in the direction along the first axis X. Moreover, for example, when light is irradiated from the second positive direction Y1 side and the second negative direction Y2 side, the two inclined planes 33 located on the second negative direction Y2 side and the second positive direction Y1 side compared to the second main surface M2 can be photographed as an area with strong reflected light. Moreover, the area with strong reflected light reflects the shape of the above-mentioned two inclined planes 33 and is photographed as an area with long sides in the direction along the first axis X. Therefore, by confirming the direction of the area with strong reflected light in the captured image, the direction of the coil component 10 can be identified.

[0057] <Change Example>

[0058] The above-described embodiment and the following modified examples can be implemented in combination with each other within the scope of no technical contradiction.

[0059] The shape of the winding core 11 is not limited to the example of the above-mentioned embodiment. For example, the shape of the winding core 11 may be an elliptical column shape or a polygonal column shape other than a quadrangular column shape.

[0060] The coil component 10 may include two or more wires 50. When there are two wires 50, the coil component 10 preferably includes a third external electrode mounted on the first flange 21 side and a fourth external electrode mounted on the second flange 22 side. Furthermore, the second wire 50 is preferably connected to the third external electrode and the fourth external electrode.

[0061] The shape of the wire 50 is not limited to the example of the above embodiment. When viewed in a cross section perpendicular to the direction in which the wire 50 extends, the shape of the wire 50 may be an elliptical shape other than a circle, or may be a polygonal shape.

[0062] The materials of the first external electrode 41 and the second external electrode 42 are not limited to the examples in the above-mentioned embodiment.

[0063] The layer structure of the first external electrode 41 and the second external electrode 42 is not limited to the example of the above embodiment. For example, the first external electrode 41 and the second external electrode 42 may have at least one conductive layer. In addition, in the above embodiment, the first external electrode 41 and the second external electrode 42 may also be plate-shaped metal terminals.

[0064] The material of the drum core 10C and the plate core 10F is not limited to the examples of the above-mentioned embodiment. For example, the material of the drum core 10C and the plate core 10F is not limited to Ni-Zn ferrite, but may be Mn-Zn ferrite. In addition, the material of the drum core 10C and the plate core 10F is not limited to magnetic materials, but may be alumina, synthetic resin, and a mixture thereof.

[0065] The shape of the plate-like core 10F is not limited to a rectangular plate shape. That is, the shapes of the first main surface M1 and the second main surface M2 are not limited to a rectangular shape.

[0066] The inclined plane 33 of the plate-like core 10F is not limited to the side surface of the recessed portion 30. For example, the inclined plane may extend in a direction protruding toward the third negative direction Z2 side relative to the second main surface M2. Figure 6 As shown in the example, the plate-like core 10F has two protrusions 300 protruding relative to the second main surface M2. Each protrusion 300 is a quadrangular pyramid-shaped protrusion. When viewed in a direction orthogonal to the second main surface M2, the edge 310 of each protrusion 300 is a rectangle. In the present embodiment, the edge 310 of each protrusion 300 is a rectangle with long sides in the direction along the first axis X. That is, the two long sides of the edge 310 of each protrusion 300 are parallel to the first axis X. The two short sides of the edge 310 of each protrusion 300 are parallel to the second axis Y.

[0067] like Figure 6 As shown in the example, each convex portion 300 has a distal end face 320 and four inclined planes 330. That is, the plate-like core 10F has inclined planes 330. When viewed in a direction perpendicular to the second main surface M2, each distal end face 320 is a rectangle with its long side in the direction along the first axis X.

[0068] like Figure 6As shown in the example, each inclined plane 330 extends from the second main surface M2 toward the end surface 320 of each protrusion 300. That is, the inclined plane 330 extends from each of the four sides of the edge 310 of each rectangular protrusion 300 toward the end of each protrusion 300. Therefore, the plate-like core 10F has four inclined planes 330 for each protrusion 300. Moreover, the edge of each inclined plane 330 on the end side of the protrusion 300 is connected to each side of the outer edge of the end surface 320. In addition, Figure 6 In the example shown, the number of the convex portion 300 may be one. In addition, the convex portion 300 may be in a pyramid shape or the like without the terminal surface 320 .

[0069] The angle between the virtual plane VP and the inclined plane 33 , that is, the angle W inside the recess 30 may be less than 10 degrees or greater than 80 degrees. The angle W may be appropriately changed according to the position of the light source LS when imaging the coil component 10 .

[0070] · It is also possible that not all the side surfaces of the recess 30 are inclined planes 33. Among the side surfaces of the recess 30, at least one may be an inclined plane 33. For example, a part of the four side surfaces of the recess 30 may be a surface orthogonal to the second main surface M2. In addition, for example, it is also possible that the side surface of the recess 30 is composed of a pair of inclined planes 33 and a pair of curved surfaces connecting the inclined planes 33. As a result, it is also possible that the opening edge 31 of the recess 30 is not rectangular when viewed in a direction orthogonal to the second main surface M2.

[0071] The recessed portion 30 may be open to the outside of the plate-like core 10F in the direction along the first axis X and in the direction along the second axis Y. Figure 5 In the example shown, in each recess 30, the opening edge 31 of the recess 30 reaches the edge of the second main surface M2. In other words, the recess 30 is open to the outside of the plate-like core 10F along one direction in the direction of the second axis Y. As a result, the recess 30 has three inclined planes 33. Figure 5 In the example shown, the effect described in (1) is obtained.

[0072] The shape of the recess 30 is not limited to a quadrangular pyramid. For example, the recess 30 may be a pyramid other than a quadrangular pyramid. In addition, the recess 30 may be a pyramid such as a quadrangular pyramid. That is, the recess 30 may not have a bottom surface 32.

[0073] The plate-like core 10F only needs to have at least one recess 30. Even when the plate-like core 10F has one recess 30, it is preferred that the recess 30 be located away from the central axis C of the winding core 11 when viewed in a direction perpendicular to the second main surface M2.

[0074] · Alternatively, the plate-like core 10F may have more than three recesses 30. Alternatively, when the plate-like core 10F has more than three recesses 30, when viewed in a direction orthogonal to the second main surface M2, the positional relationship between two recesses 30 among the plurality of recesses 30 is line-symmetrical with respect to the central axis C of the winding core portion 11. Furthermore, when the plate-like core 10F has a plurality of recesses 30, it is preferred that the side surface of each recess 30 is an inclined plane 33. Furthermore, when there are a plurality of recesses 30, the shapes of the recesses 30 may be different from each other, or only a portion of the recesses 30 may be the same shape.

[0075] The recess 30 may be located in the second region P2 which is the center of the three regions in the second main surface M2 of the plate-like core 10F. Also, the recess 30 may be located on the central axis C of the winding core 11 when viewed in a direction perpendicular to the second main surface M2.

[0076] The positional relationship of the recesses 30 on the second main surface M2 can be changed as appropriate. For example, by setting the positions of the recesses 30 to positions that are not rotationally symmetrical about the center point of the second main surface M2, the direction of the coil component 10 can be identified based on the positions of the recesses 30.

[0077] <Note>

[0078] The following describes technical ideas derived from the above-mentioned embodiments and modifications.

[0079] [1] A coil component comprising: a first core having a columnar winding core portion, a first flange portion connected to a first end of the winding core portion in a direction along a central axis, and a second flange portion connected to a second end of the winding core portion on the opposite side to the first end; a plate-shaped second core having a first main surface; and a wire material wound around the winding core portion, the first main surface being connected to the first flange portion and the second flange portion, the second core having, on the opposite side to the first main surface, a second main surface parallel to the first main surface and an inclined plane inclined relative to the second main surface.

[0080] [2] In the coil component described in [1], the second core has a recessed portion that is recessed relative to the second main surface, and the inclined plane is a side surface of the recessed portion that extends from the second main surface toward a bottom of the recessed portion.

[0081] [3] In the coil component described in [2], when viewed in a direction perpendicular to the second main surface, the opening edge of the recessed portion is rectangular, and the inclined planes extend from four sides of the opening edge of the rectangle.

[0082] [4] In the coil component described in [2] or [3], an angle formed by the inclined plane and a virtual plane including the second main surface, that is, an angle inside the recessed portion, is greater than or equal to 10 degrees and less than or equal to 80 degrees.

[0083] [5] In the coil component described in any one of [2] to [4], the material of the second core is a magnetic material, and when viewed in a direction perpendicular to the second main surface, the recessed portion is not located on the central axis of the winding core portion.

[0084] [6] In the coil component described in [5], when the above-mentioned second main surface is equally divided into three regions arranged along a direction parallel to the second main surface and orthogonal to the above-mentioned central axis of the above-mentioned core portion, the above-mentioned recessed portion is located in one of two regions of the above-mentioned three regions except the central region.

[0085] [7] In the coil component described in any one of [2] to [6], the second core has a plurality of the recessed portions, and the side surface of each of the recessed portions is the inclined plane.

[0086] [8] In the coil component described in [7], when viewed in a direction perpendicular to the second main surface, the positional relationship between two of the plurality of recesses is line-symmetrical with respect to the central axis of the winding core.

[0087] [9] In the coil component described in [1], the second core has a convex portion protruding relative to the second main surface, and the inclined plane is a side surface of the convex portion extending from the second main surface toward a distal end of the convex portion.

Claims

1. A coil component, characterized in that: have: a first core having a columnar winding core portion, a first flange portion connected to a first end of the winding core portion in a direction along a central axis, and a second flange portion connected to a second end of the winding core portion on a side opposite to the first end; a plate-shaped second core having a first main surface; and a wire material wound on the winding core, The first main surface is connected to the first flange portion and the second flange portion, The second core has, on the side opposite to the first main surface, a second main surface parallel to the first main surface and an inclined plane inclined with respect to the second main surface.

2. The coil component according to claim 1, characterized in that The second core has a recessed portion that is recessed relative to the second main surface. The inclined plane is a side surface of the recessed portion extending from the second main surface toward the bottom of the recessed portion.

3. The coil component according to claim 2, characterized in that When viewed in a direction perpendicular to the second main surface, the opening edge of the recess is rectangular. The inclined planes extend from each of four sides of the rectangular opening edge.

4. The coil component according to claim 2, characterized in that An angle formed by the inclined plane and a virtual plane including the second main surface, that is, an angle of the inner side of the recessed portion, is not less than 10 degrees and not more than 80 degrees.

5. The coil component according to claim 2, characterized in that: The material of the second core is magnetic material. The recessed portion is not located on the central axis of the winding core when viewed in a direction perpendicular to the second main surface.

6. The coil component according to claim 5, characterized in that When the second main surface is equally divided into three regions arranged in a direction parallel to the second main surface and orthogonal to the central axis of the winding core, The recessed portion is located in one of two regions among the three regions except for the central region.

7. The coil component according to claim 2, characterized in that: The second core has a plurality of the recessed portions. The side surface of each of the recessed portions is the inclined plane.

8. The coil component according to claim 7, characterized in that When viewed in a direction perpendicular to the second main surface, the positional relationship of two of the plurality of recessed portions is line-symmetrical with respect to the central axis of the winding core.

9. The coil component according to claim 1, characterized in that: The second core has a convex portion protruding relative to the second main surface, The inclined plane is a side surface of the convex portion extending from the second main surface toward a distal end of the convex portion.

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