Coil component

Abstract

To provide a coil component in which a determination of a posture can be easier made.SOLUTION: A coil component 10 comprises: a drum core 10C as a first core; a plate core 10F as a second core; and a wire 50. The drum core 10C includes: a column-like winding core part 11; a first flange part 21 that is contacted to a first end of a direction along a center shaft line C of the winding core part 11; and a second flange part 22 that is connected to a second end on the side opposite to the first end in the winding core part 11. The plate core 10F is a plate shape having a first main surface M1. The first main surface M1 is connected to the first flange part 21 and the second flange part 22. The plate core 10F includes: a second main surface M2 that is parallel to the first main surface M1 on the side opposite to the first main surface M1; and an inclination plane surface 33 that is inclined to the second main surface M2.SELECTED DRAWING: Figure 1

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 core, two external electrodes, a wire, and a plate core. The drum core includes a winding core portion, a first flange portion, and a second flange portion. The winding core portion is quadrangular prism-shaped. 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. The external electrodes are attached to each of the flange portions one by one. The wire is wound around the winding core portion. The first end of the wire is connected to the external electrode on the first flange portion side. The second end of the wire is connected to the external electrode on the second flange portion side.

[0003] The plate core is connected to the end face on the opposite side of the surface of the first flange portion where the external electrode is located. Further, the plate core is connected to the end face on the opposite side of the surface of the second flange portion where the external electrode is located. That is, the plate core is bridged over the first flange portion and the second flange portion.

[0004] The plate core has two recesses on the outer surface on the opposite side of the surface of the plate core that is connected to the first flange portion and the second flange portion. Each recess is recessed with respect to the outer surface. The recess is a frustum-shaped depression.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The coil component described in Patent Document 1 can determine the posture of the coil component by observing the concave portion of the plate core. For example, the plate core is photographed from a position facing the outer surface of the plate core. Then, based on the positional relationship between the two concave portions in the photographed image, the posture of the coil component can be determined. However, this method assumes that the location where the concave portion exists and the outer surface where the concave portion does not exist can be clearly distinguished in the photographed image on the surface of the plate core. Therefore, there is a possibility that high-definition imaging equipment may be required as the equipment for photographing the outer surface of the plate core.

Means for Solving the Problem

[0007] To solve the above problems, the present invention provides a coil component including a columnar winding core portion, a first flange portion connected to a first end in a direction along the central axis of the winding core portion, and a second flange portion connected to a second end on the opposite side of the first end in the winding core portion, a plate-shaped second core having a first main surface, and a wire wound around the winding core portion. The first main surface is connected to the first flange portion and the second flange portion. The second core has a second main surface parallel to the first main surface and an inclined plane inclined with respect to the second main surface on the opposite side of the first main surface.

Effect of the Invention

[0008] According to the above configuration, it becomes easier to determine the posture of the coil component.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the coil component will be described with reference to the drawings. Note that the drawings may show the components enlarged for easy understanding. The dimensional ratios of the components may be different from the actual ones or those in other drawings.

[0011] <Regarding the overall configuration> As shown in FIG. 1, the coil component 10 includes a drum core 10C as a first core and a plate core 10F as a second core.

[0012] The drum core 10C includes a columnar bobbin portion 11, a first flange portion 21, and a second flange portion 22. The bobbin portion 11 has a quadrangular prism shape. Therefore, the bobbin portion 11 extends along the central axis C. When the bobbin portion 11 is viewed in cross section in a cross section orthogonal to the central axis C, the shape is a rectangular shape. Here, the “rectangular shape” means that it has four sides and is rectangular as a whole, and includes a shape in which the corners of the rectangle are chamfered. The material of the bobbin portion 11 is a magnetic material. Specifically, the material of the bobbin portion 11 can be, for example, Ni-Zn ferrite or a mixture containing Ni-Zn ferrite.

[0013] Here, a specific axis parallel to the central axis C of the core part 11 is defined as the first axis X. An axis orthogonal to the first axis X is defined 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 part 11. Also, an axis orthogonal to both the first axis X and the second axis Y is defined 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 part 11. Then, one of the directions along the first axis X is defined as the first positive direction X1, and the direction opposite to the first positive direction X1 is defined as the first negative direction X2. Similarly, one of the directions along the second axis Y is defined as the second positive direction Y1, and the direction opposite to the second positive direction Y1 is defined as the second negative direction Y2. Also, one of the directions along the third axis Z is defined as the third positive direction Z1, and the direction opposite to the third positive direction Z1 is defined as the third negative direction Z2.

[0014] As shown in FIG. 1, the first flange portion 21 is connected to the first end in the direction along the central axis C of the core part 11. Specifically, the first flange portion 21 is connected to the first end which is the end in the first positive direction X1 of the core part 11. The first flange portion 21 is an integrally formed object with the core part 11. Therefore, the material of the first flange portion 21 is the same magnetic material as that of the core part 11. The first flange portion 21 projects outward with respect to the outer peripheral surface of the core part 11 in the direction along the second axis Y and the direction along the third axis Z.

[0015] The second flange portion 22 is connected to the second end on the side opposite to the first end in the core part 11. That is, it is connected to the second end which is the end on the first negative direction X2 side of the core part 11. The second flange portion 22 is an integrally formed object with the core part 11. Therefore, the material of the second flange portion 22 is the same magnetic material as that of the core part 11.

[0016] The plate core 10F is in the shape of a rectangular plate. The dimension of the plate core 10F in the direction along the first axis X is slightly larger than the dimension of the drum core 10C in the direction along the first axis X. Also, the dimension of the plate core 10F in the direction along the second axis Y is slightly larger than the dimension of the drum core 10C in the direction along the second axis Y. The dimension of the plate core 10F in the direction along the third axis Z is smaller compared to the dimension in the direction along the first axis X and the dimension of the plate core 10F in the direction along the second axis Y. The long side of the plate core 10F is parallel to the first axis X. The short side of the plate core 10F is parallel to the second axis Y.

[0017] The plate core 10F is located on the third negative direction Z2 side with respect to the drum core 10C. The plate 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. That is, the plate core 10F is bridged over the first flange portion 21 and the second flange portion 22. When viewed in plan view facing the direction along the third axis Z, the virtual line that bisects the plate core 10F in the direction along the second axis Y coincides with the central axis C of the core portion 11. The material of the plate core 10F is the same magnetic material as that of the drum core 10C.

[0018] 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 facing the third positive direction Z1. Although not shown, 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 laminated on the surface of the first flange portion 21. The plating layer is composed of three layers laminated on the surface of the metal layer. The plating layer is laminated in the order of copper, nickel, and tin from the metal layer side.

[0019] The second external electrode 42 covers the entire surface of the second flange portion 22 facing the third positive direction Z1. The configuration of the second external electrode 42 is the same as that of the first external electrode 41. That is, the second external electrode 42 has a metal layer and a three-layered plating layer.

[0020] In the coil component 10, the end face on the +Z1 side where the first external electrode 41 and the second external electrode 42 are located is the mounting surface that faces the substrate when the coil component 10 is mounted on the substrate.

[0021] As shown in FIG. 1, the coil component 10 includes a wire 50 wound around a bobbin portion 11. Although not shown in the figure, the wire 50 has a copper wire and an insulating coating. The insulating coating covers the outer surface of the copper wire. When viewed in cross-section in a cross-section orthogonal to the direction in which the wire 50 extends, the shape of the wire 50 is substantially circular.

[0022] As shown in FIG. 2, the first wire end 50A of the wire 50 is connected to the first external electrode 41. The second wire end 50B of the wire 50 is connected to the second external electrode 42. The wire 50 is wound around the bobbin portion 11 so as to proceed counterclockwise as it goes from the first wire end 50A side to the second wire end 50B side when viewed facing the -X2 direction.

[0023] <Regarding the recess of the plate core> As shown in FIG. 2, the plate core 10F is plate-shaped and has a first main surface M1. The first main surface M1 is connected to the first flange portion 21 and the second flange portion 22. Further, the plate 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. Here, the term "parallel" allows for a slight deviation caused by manufacturing errors or the like. The first main surface M1 and the second main surface M2 are rectangular in shape and elongated in the X direction of the first axis. Also, both the first main surface M1 and the second main surface M2 are orthogonal to the third axis Z.

[0024] As shown in FIG. 1, the plate core 10F has two recesses 30 that are recessed with respect to the second main surface M2. Since the two recesses 30 have the same shape, the shape of one recess 30 will be described as a representative. The recess 30 is a frustum of a square pyramid-shaped depression. Therefore, as shown in FIG. 3, when viewed in the direction perpendicular to the second main surface M2, the opening edge 31 of the recess 30 is rectangular. In the present embodiment, the opening edge 31 of the recess 30 is rectangular with a long side along the first axis X. That is, two long sides of the opening edge 31 of the recess 30 are parallel to the first axis X. Two short sides of the opening edge 31 of the recess 30 are parallel to the second axis Y.

[0025] The recess 30 has a bottom surface 32 and four inclined planes 33. That is, the plate core 10F has inclined planes 33. The shape of the bottom surface 32 is similar to the opening edge 31 of the recess 30 and is smaller than the opening edge 31. That is, when viewed in the direction perpendicular to the second main surface M2, the bottom surface 32 is rectangular with a long side along the first axis X.

[0026] Each inclined plane 33 extends from the second main surface M2 toward the bottom surface 32 of the recess 30. That is, the inclined planes 33 extend from each of the four sides of the rectangular opening edge 31 toward the bottom of the recess 30. Therefore, the plate core 10F has four inclined planes 33 for one recess 30. And the edge on the bottom side of the recess 30 in each inclined plane 33 is connected to each side of the outer edge of the bottom surface 32.

[0027] Here, the "plane" only needs to be observable as a plane when observing the entire plate core 10F, ignoring slight unevenness that cannot be observed without a microscope. Therefore, each inclined plane 33 does not include a curved surface that can be visually recognized when observing the entire plate core 10F.

[0028] The inclined plane 33 is the side surface of the quadrangular frustum-shaped recess 30. Therefore, the inclined plane 33 is inclined with respect to the second main surface M2. Also, the inclined plane 33 is inclined so as to approach the opposing inclined plane 33 as it goes toward the bottom side of the recess 30. Here, as shown in FIG. 4, a virtual plane VP including the second main surface M2 is assumed. At this time, the angle W inside the recess 30, which is the angle formed by the virtual plane VP and the inclined plane 33, is 10 degrees or more and 80 degrees or less, preferably 35 degrees or more and 55 degrees or less. Specifically, in the present embodiment, the above angle W is about 45 degrees.

[0029] As shown in FIG. 3, when viewed in the direction orthogonal to the second main surface M2, each recess 30 is not located on the central axis C of the bobbin core portion 11. Note that not being located on the central axis C means that the central axis C and the opening edge 31 of the recess 30 do not intersect.

[0030] As shown in FIG. 3, assume that the second main surface M2 is equally divided into three regions in the direction parallel to the second main surface M2 and orthogonal to the central axis C of the bobbin core portion 11. Then, each region is defined as a first region P1, a second region P2, and a third region P3 in order from the second negative direction Y2 side toward the second positive direction Y1 side. At this time, one of the recesses 30 is located within the first region P1. Also, the remaining one of the recesses 30 is located within the third region P3. That is, each recess 30 is located within one of the two regions excluding the central second region P2 among the three regions.

[0031] Furthermore, the positional relationship between the two recesses 30 is line-symmetrical with respect to the central axis C of the bobbin core portion 11 when viewed in the direction orthogonal to the second main surface M2. In other words, the two recesses 30 are in a mirror image relationship with respect to the central axis C.

[0032] <Regarding the discrimination method of the coil component of the present embodiment> As shown in FIG. 4, it is assumed that the second main surface M2 is irradiated with light using two light sources LS. One light source LS is located on the second positive direction Y1 side and the third negative direction Z2 side with respect 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 with respect to the second main surface M2. Each light source LS irradiates the second main surface M2 with light at an angle inclined with respect to the second main surface M2.

[0033] For example, as shown in FIG. 4, it is assumed that the light irradiated from the light source LS located on the second positive direction Y1 side and the third negative direction Z2 side with respect to the second main surface M2 is incident on the inclined plane 33 located in the second negative direction Y2 of the recess 30. In this case, the light reflected by the inclined plane 33 generally travels in 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 with respect to the third negative direction Z2.

[0034] Similarly, it is assumed that the light irradiated from the light source LS located on the second negative direction Y2 side and the third negative direction Z2 side with respect to the second main surface M2 is incident on the inclined plane 33 located in the second positive direction Y1 of the recess 30. In this case, the light reflected by the inclined plane 33 generally travels in 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 with respect to the third negative direction Z2.

[0035] Under such conditions, it is assumed that the second main surface M2 is photographed with a camera CMR from the third negative direction Z2 side. In this case, the two inclined planes 33 located on the second positive direction Y1 side and the second negative direction Y2 side can be photographed as regions with stronger reflected light than the second main surface M2.

[0036] <Regarding the effects of this embodiment> (1) When irradiating the coil component 10 with light from the light source LS, it is not always possible to irradiate the light directly above the coil component 10, and in many cases, it is necessary to irradiate the light at an angle that is at least slightly inclined with respect to the second main surface M2 of the plate core 10F. In the above embodiment, the plate core 10F has an inclined plane 33 that is inclined with respect to the second main surface M2. As described above, when irradiating light in a state inclined with respect to the second main surface M2, any one of the inclined planes 33 can be photographed as a region with stronger reflected light than the second main surface M2. That is, in the photographed image, the contrast between any one of the inclined planes 33 and the second main surface M2 becomes strong. For example, when the image photographed as described above is binarized, image processing is easy to perform such that only the two inclined planes 33 become bright portions and the other portions become dark portions. Therefore, the posture of the coil component 10 can be determined based on the inclined plane 33 without using a high-precision imaging device.

[0037] (2) In the above embodiment, the inclined plane 33 is the side surface of the recess 30. If the inclined plane 33 protrudes from the second main surface M2 toward the third negative direction Z2 side, the height dimension when the coil component 10 is mounted on the substrate increases by the amount of the inclined plane 33. According to the above configuration, the height dimension of the coil component 10 by the inclined plane 33 can be suppressed as compared with the case where the inclined plane 33 protrudes from the second main surface M2.

[0038] (3) In the above embodiment, in the recess 30, the inclined plane 33 extends from each of the four sides of the rectangular opening edge 31. According to this configuration, no matter from which diagonal 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 stronger reflected light.

[0039] (4) Suppose the angle formed between the virtual plane VP and the inclined plane 33, which is the angle W inside the recess 30, is close to 0 degrees or close to 90 degrees. In this case, in order to enhance the contrast between the inclined plane 33 and the second main surface M2 in the captured image, the incident angle of light with respect to the second main surface M2 needs to be extremely large or extremely small. In the above embodiment, the angle W is 10 degrees or more and 80 degrees or less. If the angle W is within such a numerical range, even if the incident angle of light with respect to the second main surface M2 is not an extreme angle, the difference in contrast between the inclined plane 33 and the second main surface M2 in the captured image can be obtained. That is, restrictions on the position of the light source LS are less likely to occur.

[0040] (5) Suppose a current is applied to the coil component 10. In the plate core 10F, magnetic flux concentrates on the central axis C of the bobbin part 11 when viewed in the direction perpendicular to the second main surface M2. In the above embodiment, when viewed in the direction perpendicular to the second main surface M2, the recess 30 is not located on the central axis C of the bobbin part 11. Therefore, according to the above configuration, it is possible to suppress a decrease in the volume of the plate core 10F at the location where the magnetic flux concentrates. That is, according to the above configuration, a decrease in inductance in the coil component 10 can be suppressed.

[0041] (6) In the above embodiment, the recess 30 is located within either of the two regions excluding the central second region P2 among the three regions. That is, the recess 30 is located avoiding the region including the central axis C when viewed in the direction perpendicular to the second main surface M2. Therefore, the above configuration is a more preferable configuration for suppressing a decrease in the inductance of the coil component 10.

[0042] (7) For example, due to manufacturing errors or the like, when the inclined plane 33 of the concave portion 30 is not inclined with respect to the second main surface M2 at the designed angle, the contrast between the second main surface M2 and the inclined plane 33 may be difficult to occur in the captured image. In the above embodiment, the plate core 10F has two concave portions 30. Thus, by having a plurality of concave portions 30, even if the contrast of the inclined plane 33 in one concave portion 30 is difficult to occur in the image, the inclined plane 33 of the other concave portion 30 can be identified on the image.

[0043] (8) In the above embodiment, when viewed in the direction perpendicular to the second main surface M2, the positional relationship between the two concave portions 30 is line-symmetric with respect to the central axis C of the bobbin portion 11. According to this configuration, since the two concave portions 30 are located at symmetric positions, in the direction along the second axis Y, the center of gravity of the coil component 10 is less likely to be biased due to the presence of the concave portions 30. Therefore, according to the above configuration, when mounting the coil component 10 on the substrate, it is possible to suppress the coil component 10 from falling over.

[0044] (9) In the above embodiment, the opening edge 31 of the concave portion 30 is a rectangular shape that is long in the direction along the first axis X. And, for example, when irradiating light 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 can be photographed as regions with stronger reflected light than the second main surface M2. And this region with stronger reflected light is photographed as a region that is long in the direction along the first axis X, reflecting the shape of the two inclined planes 33. Therefore, by checking the direction of the region with stronger reflected light in the captured image, the orientation of the coil component 10 can be determined.

[0045] <Modified Example> The above embodiment and the following modified examples can be implemented in combination with each other within a technically non-contradictory range.

[0046] · The shape of the bobbin portion 11 is not limited to the example of the above embodiment. For example, the shape of the bobbin portion 11 may be an elliptical column shape or a polygonal column shape other than a square column shape. · The coil component 10 may include two or more wires 50. When there are two wires 50, the coil component 10 may further include a third external electrode attached to the first flange portion 21 side and a fourth external electrode attached to the second flange portion 22 side. And the second wire 50 may be connected to the third external electrode and the fourth external electrode.

[0047] · The shape of the wire 50 is not limited to the example of the above embodiment. When viewed in cross-section in a cross-section orthogonal 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 a polygonal shape.

[0048] · The materials of the first external electrode 41 and the second external electrode 42 are not limited to the examples of the above embodiment. · The layer structures of the first external electrode 41 and the second external electrode 42 are not limited to the examples of the above embodiment. For example, the first external electrode 41 and the second external electrode 42 may have at least one conductive layer. Also, in the above embodiment, the first external electrode 41 and the second external electrode 42 may be plate-shaped metal terminals.

[0049] · The materials of the drum core 10C and the plate core 10F are not limited to the examples of the above embodiment. For example, the materials of the drum core 10C and the plate core 10F are not limited to Ni-Zn-based ferrites, and may be Mn-Zn-based ferrites. Also, the materials of the drum core 10C and the plate core 10F are not limited to magnetic materials, and may be alumina, synthetic resin, and mixtures thereof, etc.

[0050] · The shape of the plate 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 rectangular shapes. · The inclined plane 33 of the board core 10F is not limited to the side surface of the recess 30. For example, the inclined plane may extend in a direction protruding toward the negative Z2 side with respect to the second main surface M2. For example, as in the example shown in FIG. 6, the board core 10F has two convex portions 300 protruding with respect to the second main surface M2. Each convex portion 300 is a frustum-shaped protrusion. When viewed in a direction orthogonal to the second main surface M2, the edge 310 of each convex portion 300 is rectangular. In the present embodiment, the edge 310 of each convex portion 300 is rectangular with a long side along the first axis X. That is, two long sides of the edge 310 of each convex portion 300 are parallel to the first axis X. Two short sides of the edge 310 of each convex portion 300 are parallel to the second axis Y.

[0051] As in the example shown in FIG. 6, each convex portion 300 has a tip surface 320 and four inclined planes 330. That is, the board core 10F has the inclined planes 330. When viewed in a direction orthogonal to the second main surface M2, each tip surface 320 is rectangular with a long side along the first axis X.

[0052] As in the example shown in FIG. 6, each inclined plane 330 extends from the second main surface M2 toward the tip surface 320 of each convex portion 300. That is, the inclined planes 330 extend from each of the four sides of the edge 310 of each rectangular convex portion 300 toward the tip of each convex portion 300. Therefore, the board core 10F has four inclined planes 330 for each convex portion 300. And the edge on the tip side of the convex portion 300 in each inclined plane 330 is connected to each side of the outer edge of the tip surface 320. In the example shown in FIG. 6, the number of convex portions 300 may be one. Also, the convex portion 300 may have a shape such as a pyramid shape without the tip surface 320.

[0053] · The angle formed by the virtual plane VP and the inclined plane 33, and the angle W inside the recess 30 may be less than 10 degrees or greater than 80 degrees. The above angle W may be appropriately changed according to the position of the light source LS or the like when photographing the coil component 10.

[0054] · Not all the side surfaces of the recess 30 have to be the inclined planes 33. At least one of the side surfaces of the recess 30 may be the inclined plane 33. For example, a part of the four side surfaces of the recess 30 may be a plane orthogonal to the second main surface M2. Also, for example, the side surface of the recess 30 may be composed of a pair of inclined planes 33 and a pair of curved surfaces connecting the inclined planes 33. As a result, when viewed in the direction facing orthogonal to the second main surface M2, the opening edge 31 of the recess 30 does not have to be rectangular.

[0055] · The recess 30 may be open to the outside of the plate core 10F in the direction along the first axis X and the direction along the second axis Y. For example, in the example shown in FIG. 5, in each recess 30, the opening edge 31 of the recess 30 reaches the edge of the second main surface M2. In other words, one of the directions along the second axis Y of the recess 30 is open to the outside of the plate core 10F. As a result, the recess 30 has three inclined planes 33. Even in the example as shown in FIG. 5, the effect described in (1) can be obtained.

[0056] · The shape of the recess 30 is not limited to a frustum of a quadrangular pyramid. For example, the recess 30 may be a frustum of a pyramid other than a quadrilateral. Also, the shape of the recess 30 may be a pyramid shape such as a quadrangular pyramid. That is, the recess 30 does not have to have the bottom surface 32.

[0057] · The plate core 10F only needs to have at least one recess 30. Even when there is one recess 30 in the plate core 10F, when viewed in the direction facing orthogonal to the second main surface M2, it is preferable that the recess 30 is located avoiding the central axis C of the winding core portion 11.

[0058] · The plate core 10F may have three or more recesses 30. When the plate core 10F has three or more recesses 30, when viewed in a direction orthogonal to the second main surface M2, the positional relationship between two of the plurality of recesses 30 may be line-symmetrical with respect to the central axis C of the bobbin portion 11. Further, when the plate core 10F has a plurality of recesses 30, it is preferable that the side surfaces of the respective recesses 30 are inclined planes 33. Further, when a plurality of recesses 30 are present, the shapes of the recesses 30 may be different from each other, or only some of the recesses 30 may have the same shape.

[0059] · On the second main surface M2 of the plate core 10F, the recess 30 may be located in the central second region P2 among the three regions. Further, when viewed in a direction orthogonal to the second main surface M2, the recess 30 may be located on the central axis C of the bobbin portion 11.

[0060] · The positional relationship of each recess 30 on the second main surface M2 can be changed as appropriate. For example, by setting the position of the recess 30 to a position that is not rotationally symmetric about the center point of the second main surface M2, it is also possible to determine the orientation of the coil component 10 based on the position of the recess 30.

[0061] <Supplementary Note> The technical ideas derivable from the above-described embodiments and modification examples are described below. [1] A first core having a columnar bobbin portion, a first flange portion connected to a first end in a direction along the central axis of the bobbin portion, and a second flange portion connected to a second end opposite to the first end in the bobbin portion, a plate-like second core having a first main surface, and a wire wound around the bobbin portion, wherein the first main surface is connected to the first flange portion and the second flange portion, and 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.

[0062] [2] The coil component according to [1], wherein the second core has a recess recessed with respect to the second main surface, and the inclined plane is a side surface of the recess extending from the second main surface toward the bottom of the recess.

[0063] [3] When viewed in a direction perpendicular to the second major surface, the opening edge of the recess is rectangular, and the inclined planes extend from each of the four sides of the rectangular opening edge. The coil component according to [2].

[0064] [4] The angle formed between the virtual plane including the second major surface and the inclined plane, which is the angle inside the recess, is 10 degrees or more and 80 degrees or less. The coil component according to [2] or [3]. [5] The material of the second core is a magnetic material. When viewed in a direction perpendicular to the second major surface, the recess is not located on the central axis of the bobbin portion. The coil component according to any one of [2] to [4].

[0065] [6] When the second major surface is equally divided into three regions in a direction parallel to the second major surface and perpendicular to the central axis of the bobbin portion, the recess is located in any one of the two regions excluding the central region among the three regions. The coil component according to [5].

[0066] [7] The second core has a plurality of the recesses, and the side surfaces of each of the recesses are the inclined planes. The coil component according to any one of [2] to [6]. [8] When viewed in a direction perpendicular to the second major surface, the positional relationship between two of the plurality of recesses is line-symmetric with respect to the central axis of the bobbin portion. The coil component according to [7].

[0067] [9] The second core has a convex portion protruding from the second major surface, and the inclined plane is the side surface of the convex portion extending from the second major surface toward the tip of the convex portion. The coil component according to [1].

Explanation of Reference Numerals

[0068] C…Central axis M1…First major surface M2…Second major surface W…Angle 10…Coil component 10C... Drum core 10F... Plate core 11... Spool core part 21... First flange part 22... Second flange part 30... Recess 31... Opening edge 32... Bottom surface 33... Inclined plane 50... Wire

Claims

1. A first core having a columnar winding core portion, a first flange portion connected to a first end in a direction along the central axis of the winding core portion, and a second flange portion connected to a second end opposite to the first end in the winding core portion, A plate-shaped second core having a first main surface, A wire wound around the winding core portion, Comprising, The first main surface is connected to the first flange portion and the second flange portion, On the side opposite to the first main surface, the second core has a second main surface parallel to the first main surface and an inclined plane inclined with respect to the second main surface. Coil component.

2. The second core has a recess recessed with respect to the second main surface, The inclined plane is a side surface of the recess extending from the second main surface toward the bottom of the recess. The coil component according to claim 1.

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

4. The angle formed by the virtual plane including the second main surface and the inclined plane, which is the angle inside the recess, is 10 degrees or more and 80 degrees or less. The coil component according to claim 2.

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

6. When the second main surface is equally divided into three regions in a direction parallel to the second main surface and perpendicular to the central axis of the winding core portion, The recess is located in any one of the two regions excluding the central region among the three regions. The coil component according to claim 5.

7. The second core has a plurality of the recesses, The side surface of each of the recesses is the inclined plane. The coil component according to claim 2.

8. 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 portion. The coil component according to claim 7.

9. The second core has a convex portion protruding with respect to the second main surface, The inclined plane is a side surface of the convex portion extending from the second main surface toward the tip of the convex portion. The coil component according to claim 1.

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