Coil component and electronic device including same

Abstract

The present disclosure provides: a coil component structured so as not to cause plating cracks on lead wiring or lower the strength of the lead wiring; and an electronic device including the same. A coil component (1) according to the present disclosure comprises: an enclosure (4) having a pair of first and second main surfaces that face each other and a plurality of lateral surfaces connecting the first and second main surfaces; and coil conductors (2, 3) disposed inside the enclosure (4). The coil conductors (2, 3) have coils (2a, 3a) disposed inside the enclosure (4) and lead wires (2b, 2d, 3b, 3d) which are connected to the coils (2a, 3a), drawn out from the lateral surfaces of the enclosure (4), and bent along said lateral surfaces. The enclosure (4) has projections (5, 6) at positions overlapping the lead wires (2b, 2d, 3b, 3d) as seen in a plan view of the lateral surface from which the lead wires (2b, 2d, 3b, 3d) are drawn out.

Description

Coil components and electronic devices containing them

[0001] The present disclosure relates to a coil component and an electronic device including the same.

[0002] In recent years, there has been a strong demand for miniaturization of electronic devices, and it is also desirable to miniaturize the coil components and the like mounted on such electronic devices. For this reason, in electronic components such as coil components, as disclosed in Japanese Utility Model Laid-Open Publication No. 05-029122 (Patent Document 1), a structure has been adopted in which an element (for example, a coil) is covered with an insulator, and lead-out wiring drawn out from this insulator is bent along the side and bottom surfaces of the insulator and soldered to a substrate on the bottom side of the insulator.

[0003] Japanese Utility Model Application Publication No. 05-029122

[0004] However, in the structure described in Japanese Utility Model Application Laid-Open Publication No. 05-029122 (Patent Document 1), the lead wire is bent at a substantially right angle at the position where it is led out from the insulator, which places a large load on the bent portion. In particular, if the lead wire has undergone surface treatment such as plating, there is a risk of plating cracks occurring when a large load is placed on the bent portion. Furthermore, if plating cracks occur in the lead wire, there is a risk of the strength of the lead wire being reduced.

[0005] Therefore, an object of the present disclosure is to provide a coil component having a structure that does not cause plating cracks in the lead wiring or reduce the strength of the lead wiring, and an electronic device including the coil component.

[0006] A coil component according to one embodiment of the present disclosure includes a housing having a pair of opposing first and second principal surfaces and a plurality of side surfaces connecting the first and second principal surfaces, and a coil conductor having a portion disposed inside the housing. The coil conductor includes a coil disposed inside the housing and a lead wire connected to the coil, drawn out from a side surface of the housing, and bent along the side surface. The housing has a protrusion at a position overlapping the lead wire when viewed in plan from the side surface from which the lead wire is drawn.

[0007] An electronic device according to an embodiment of the present disclosure includes the coil component described above.

[0008] According to one embodiment of the present disclosure, when viewed in plan from the side from which the draw-out wire is drawn, the housing has a protrusion at a position that overlaps with the draw-out wire, thereby preventing the radius of curvature of the bent portion of the draw-out wiring from becoming smaller and suppressing plating cracks and a decrease in strength.

[0009] Fig. 1 is a perspective view of a coil component according to embodiment 1. Fig. 2 is a side view of the coil component according to embodiment 1. Fig. 3 is a diagram for explaining a step of bending a lead wire. Fig. 4 is a diagram for explaining the relationship between a bent portion of a lead wire and the height of a protrusion. Fig. 5 is a side view of a coil component according to embodiment 2. Fig. 6 is a diagram for explaining the relationship between a bent portion of a lead wire and the depth of a groove in a coil component according to a modified example.

[0010] Hereinafter, a coil component according to an embodiment of the present invention and an electronic device including the coil component will be described with reference to the drawings.

[0011] First Embodiment First, a coil component according to the first embodiment will be described with reference to the drawings. Fig. 1 is a perspective view of the coil component 1 according to the first embodiment. Fig. 2 is a side view of the coil component 1 according to the first embodiment. Note that with respect to the X-axis, Y-axis, and Z-axis defined in Fig. 1, the X-axis direction represents the front-rear direction of the coil component 1, the Y-axis direction represents the left-right direction of the coil component 1, and the Z-axis direction represents the up-down direction of the coil component 1, respectively. Also, with respect to the X-axis, Y-axis, and Z-axis defined in Fig. 2, the X-axis direction represents the depth direction of the coil component 1, the Y-axis direction represents the left-right direction of the coil component 1, and the Z-axis direction represents the up-down direction of the coil component 1, respectively.

[0012] The coil component 1 is, for example, a transformer coil mounted in a filter circuit used to reduce noise in a power line, and is used in electronic devices such as power supply devices. The coil component 1 is not limited to power supply devices, and may be used in electronic devices other than power supply devices. Furthermore, the coil component 1 is not limited to a transformer coil configuration including coil 2a and coil 3a, and may be configured to include only one coil, or three or more coils.

[0013] The coil component 1 includes a housing 4, a coil conductor 2 (first coil conductor), and a coil conductor 3 (second coil conductor). The coil conductor 2 includes a coil 2a (first coil) disposed inside the housing 4, and a lead wire 2b (first lead wire) and a lead wire 2d (second lead wire) connected to the coil 2a. Specifically, the coil 2a has one end connected to the lead wire 2b and the other end connected to the lead wire 2d. The coil 2a and the lead wires 2b and 2d are formed from a single coil conductor 2, which is formed from a metal plate or metal wire made of, for example, copper or an alloy of copper and another metal. Furthermore, the coil conductor 2 is subjected to a surface treatment such as Ni-Sn plating or gold plating.

[0014] The coil conductor 3 includes a coil 3a (second coil) disposed inside the housing 4, and a lead wire 3b (third lead wire) and a lead wire 3d (fourth lead wire) connected to the coil 3a. Specifically, the coil 3a has the lead wire 3b connected to one end and the lead wire 3d connected to the other end. The coil 3a and the lead wires 3b and 3d are formed from a single coil conductor 3, which is formed from a metal plate or metal wire made of, for example, copper or an alloy of copper and other metals. Furthermore, the coil conductor 3 is subjected to a surface treatment such as Ni-Sn plating or gold plating.

[0015] The coil 2a has a rectangular opening and is disposed inside the housing 4 substantially parallel to the main surface 40A (first main surface). Although the coil 2a is illustrated as a single-turn coil, it may be a multi-turn coil. The lead wires 2b and 2d are drawn out from the side surface 41 of the housing 4 and extend along the side surface 41 toward the main surface 40B (second main surface). The lead wire 2b shown in FIG. 1 is extended to the main surface 40B, with the portion that contacts the main surface 40B constituting the end 2c. The lead wire 2d is also extended to the main surface 40B, with the portion that contacts the main surface 40B constituting the end 2e. When the coil component 1 is mounted on a substrate, the ends 2c and 2e are electrically connected to wiring on the substrate.

[0016] Lead wires 2b and 2d are pulled out from side surface 41 of housing 4 and bent along side surface 41. However, if lead wires 2b and 2d are bent at a substantially right angle at the position where they are pulled out from side surface 41 of housing 4, a large load is applied to the bent portions of lead wires 2b and 2d, which may cause plating cracks. Furthermore, if plating cracks occur in lead wires 2b and 2d, the strength of lead wires 2b and 2d may be reduced.

[0017] Therefore, in the coil component 1 according to the present embodiment, a protrusion 5 (first protrusion) is provided on the side surface 41 of the housing 4 to prevent the lead wires 2b and 2d from bending at approximately right angles at the positions where they are drawn out from the side surface 41 of the housing 4. The protrusion 5 is provided at a position on the housing 4 that overlaps the lead wires 2b and 2d when viewed in plan from the side surface 41 from which the lead wires 2b and 2d are drawn out. The protrusion 5 has a shape that overlaps both the lead wires 2b and 2d. The position and shape of the protrusion 5 are not limited to the position and rod shape shown in FIG. 1 , and may be any position and shape that prevents the radius of curvature of the bent portions of the lead wires 2b and 2d from becoming small. It is preferable that the protrusion 5 has a portion that is approximately parallel to the wire width direction (X direction) of the lead wires 2b and 2d. This allows the lead wires 2b and 2d to be bent evenly in the wire width direction. Furthermore, it is preferable that the width of the protrusion 5 in the line width direction (X direction) of the lead wires 2b and 2d is set wider than the area where the lead wires exist. By making it wider, even if the lead wires and the protrusions are misaligned due to manufacturing variations, the lead wires can be reliably abutted against the protrusions, and deterioration in the strength of the lead wires can be suppressed.

[0018] The coil 3a has a rectangular opening and is disposed above the coil 2a inside the housing 4, approximately parallel to the main surface 40A. Although the coil 3a is illustrated as a single-turn coil, it may be a multi-turn coil. The lead wires 3b and 3d are drawn out from the side surface 42 of the housing 4 and extend along the side surface 42 toward the main surface 40B. The lead wire 3b shown in FIG. 1 is extended to the main surface 40B, with the portion that contacts the main surface 40B constituting the end 3c. The lead wire 3d is also extended to the main surface 40B, with the portion that contacts the main surface 40B constituting the end 3e. When the coil component 1 is mounted on a substrate, the ends 3c and 3e are electrically connected to wiring on the substrate.

[0019] When the coil component 1 is mounted on a substrate, the end 2 e and the end 3 e may be electrically connected to wiring on the substrate, or the end 2 e and the end 3 e may be directly electrically connected by a connecting member (not shown) arranged on the main surface 40 B. By connecting the end 2 e and the end 3 e by the connecting member, the coil 2 a and the coil 3 a may be connected in series to form a coil component.

[0020] In the coil component 1 according to this embodiment, a protrusion 6 (second protrusion) is provided on the side surface 42 of the housing 4 to prevent the lead wires 3b and 3d from bending at approximately right angles at the positions where they are drawn out from the side surface 42 of the housing 4. The protrusion 6 is provided at a position on the housing 4 that overlaps both the lead wires 3b and 3d when viewed in plan from the side surface 42 from which the lead wires 3b and 3d are drawn out. The protrusion 6 is also shaped to overlap both the lead wires 3b and 3d. The position and shape of the protrusion 6 are not limited to the position and rod shape shown in FIG. 1 , and may be any position and shape that prevents the radius of curvature of the bent portions of the lead wires 3b and 3d from becoming small. It is preferable that the protrusion 6 have a portion that is approximately parallel to the wire width direction (X direction) of the lead wires 3b and 3d. This allows the lead wires 3b and 3d to be bent evenly in the wire width direction. Furthermore, it is preferable that the width of the protrusion 6 in the line width direction (X direction) of the lead wires 3b and 3d is set wider than the area where the lead wires are present. By making it wider, even if the lead wires and the protrusions are misaligned due to manufacturing variations, the lead wires can be reliably abutted against the protrusions, and deterioration in the strength of the lead wires can be suppressed.

[0021] Coil 2a and coil 3a are disposed inside housing 4 closer to main surface 40A than to main surface 40B. Preferably, coil 2a and coil 3a are disposed closer to main surface 40A than to the midpoint between main surfaces 40A and 40B. This allows the length of lead wire 2d extending from the other end of coil 2a to main surface 40B and the length of lead wire 3d extending from the other end of coil 3a to main surface 40B to be increased.

[0022] When end 2c of coil 2a is connected to a power source, current flows clockwise from lead wire 2b. When end 2e and end 3e of coil 3a are directly electrically connected by a connecting member disposed on main surface 40B, or when end 2e and end 3e are electrically connected by a circuit board on which coil component 1 is mounted, current flows clockwise from lead wire 3d of end 2e. Therefore, a magnetic field is generated in coil 2a in the direction from main surface 40A to main surface 40B (-Z direction). Similarly, a magnetic field is generated in coil 3a in the direction from main surface 40A to main surface 40B (-Z direction). Since coils 2a and 3a are arranged to overlap when viewed from the main surface 40A, coils 2a and 3a are magnetically coupled. While FIG. 1 shows an example in which the openings of coil 2a and coil 3a nearly overlap, the openings may be offset as long as magnetic field coupling is achieved, as long as at least 50% of each opening overlaps.

[0023] The housing 4 is formed of, for example, a molded resin that can fix the positions of the coils 2a and 3a. Specifically, the molded resin is made of epoxy resin with silica filler added, silicone resin, liquid crystal polymer, or various resins with metal magnetic material mixed in. The housing 4 has a side surface 41 and a side surface 42 that face each other, and the side surface closer to the lead wire 2b is called a side surface 43, and the side surface closer to the lead wire 2d is called a side surface 44.

[0024] As shown in FIGS. 1 and 2 , the housing 4 has a protrusion 5 on side surface 41 and a protrusion 6 on side surface 42, but no protrusions on side surfaces 43 and 44. The protrusions 5 and 6 are formed integrally with the housing 4 from molded resin. However, the protrusions 5 and 6 are not limited to being formed from molded resin, and may be formed from a material other than the molded resin. The protrusions 5 and 6 may also be attached to the side surfaces 41 and 42 after the housing 4 is formed from molded resin. While the housing 4 is shown as a rectangular parallelepiped in FIGS. 1 and 2 , the side surfaces may be inclined, and may be, for example, a trapezoid in which the area of ​​the second main surface is greater than the area of ​​the first main surface.

[0025] Next, we will explain the process of bending the lead wires 2b, 2d, 3b, and 3d when the coil conductors 2 and 3 are made of a single metal plate and the housing 4, including the protrusions 5 and 6, is made of molded resin. Figure 3 is a diagram for explaining the process of bending the lead wires 2b, 2d, 3b, and 3d. First, in STEP 1 of Figure 3, the coil 2a portion of the coil conductor 2 and the coil 3a portion of the coil conductor 3 are positioned in appropriate positions, and then the housing 4, including the protrusions 5 and 6, is molded with molded resin.

[0026] In STEP 2 of Figure 3, the coil conductors 2 and 3 drawn out from the side surface of the housing 4 are bent along the side surface. The portions of the coil conductors 2 and 3 bent along the side surface of the housing 4 are lead wires 2b, 2d, 3b, and 3d. Because protrusions 5 and 6 are provided on the side surface of the housing 4, the lead wires 2b, 2d, 3b, and 3d are bent along the side surface while abutting against the protrusions 5 and 6. Therefore, the lead wires 2b, 2d, 3b, and 3d are not bent at a substantially right angle at the drawn-out position, but are bent into a shape with a large radius of curvature at the bent portion. The portions of the coil conductors 2 and 3 further bent along the main surface 40B of the housing 4 are end portions 2c, 2e, 3c, and 3e.

[0027] When bending the coil conductors 2 and 3 made of metal plates, it is necessary to consider the springback of the bent coil conductors 2 and 3, and so the bending is performed by applying a force toward the side of the final shape. Therefore, when the bending force of the coil conductors 2 and 3 is removed, the lead wires 2b, 2d, 3b, and 3d spread outward, becoming approximately parallel to the side surface of the housing 4, as shown in STEP 3 of Figure 3.

[0028] Next, the position and shape of the protrusions 5 and 6 provided on the side surface of the housing 4 in order to bend the lead wires 2b, 2d, 3b, and 3d into a shape with a large radius of curvature at the bent portion will be further described. Figure 4 is a diagram for explaining the relationship between the bent portion of the lead wire 2b and the height X of the protrusion 5. The relationship between the bent portions of the lead wires 2d, 3b, and 3d and the heights of the protrusions 5 and 6 is also the same as the relationship explained in Figure 4.

[0029] First, the surface of the lead wire 2b is plated with Ni and Sn to a thickness of, for example, about 0.4 mm. The plating on the surface of the lead wire 2b will crack if the lead wire 2b is stretched, for example, at an elongation rate of about 100%. However, it is known that if the lead wire 2b is stretched at an elongation rate of about 33%, the plating on the surface of the lead wire 2b will be less likely to crack.

[0030] Therefore, from the viewpoint of preventing plating cracks, the position and height of the protrusion 5 can be specified so that the elongation of the bent portion of the lead wire 2b is less than approximately 33%. To simplify the calculation, as shown in FIG. 4 , consider a case where X = Z, where X is the height of the protrusion 5 from the side surface of the casing 4 on which the protrusion 5 is provided, Z is the distance from the lead wire 2b's lead-out position on the side surface of the casing 4 to the protrusion 5, and d is the thickness of the lead wire 2b. The range in which X = Z holds may be, for example, X = (0.8 to 1.2)Z. Furthermore, strictly defining the distance Z is the distance from a location 51 closest to the lead wire 2b among the locations where the protrusion 5 satisfies the height X to the end of the lead wire 2b on the protrusion 5 side.

[0031] When the above settings are made, assuming that the bent portion of the lead wire 2b has an arcuate shape, the outer length R1 of the lead wire 2b can be calculated as R1 = 2π(X + d) × (1 / 4), and the central length R2 of the lead wire 2b can be calculated as R2 = 2π(X + d / 2) × (1 / 4). Therefore, it is preferable that the ratio (R1 / R2) of the outer length R1 of the lead wire 2b to the central length R2 of the lead wire 2b be less than 4 / 3 (elongation rate less than approximately 33%). In other words, it is preferable to specify the position and height of the protrusion 5 so that the relationship R1 / R2 = (X + d) / (X + d / 2) < 4 / 3 is satisfied.

[0032] From another perspective, for example, when bending the lead wire 2b along the side surface of the housing 4, it is also possible to bend the lead wire 2b toward the side surface of the housing 4 by sandwiching a plate-shaped jig instead of providing the protrusion 5. However, in the manufacturing process, it is difficult to insert a plate-shaped jig having a thickness of 1 mm or less between the lead wire 2b to be bent and the side surface of the housing 4 and bend the lead wire 2b along the side surface of the housing 4. Therefore, when the height of the protrusion 5 from the side surface of the housing 4 on which the protrusion 5 is provided is X and the thickness of the lead wire 2b is d, it is also preferable to specify the height of the protrusion 5 so that the relationship d<X<1 mm is satisfied.

[0033] <Embodiment 2> In the coil component 1 according to embodiment 1, it has been described that the shape of the protrusion 5 overlaps both of the lead wires 2d, 2d, and the shape of the protrusion 6 overlaps both of the lead wires 3d, 3d. However, the shapes of the protrusions 5, 6 are not limited to this, and they may overlap each of the lead wires. Fig. 5 is a side view of a coil component 1A according to embodiment 2. The side view shown in Fig. 5(a) is a side view of the coil component 1A when the side surface 41 of the housing 4 is viewed from the front. Note that in the coil component 1A shown in Fig. 5, the same components as those in the coil component 1 shown in Figs. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

[0034] In coil component 1A according to embodiment 2, protrusions 5a (first protrusions) and protrusions 5b (second protrusions) are provided on side surface 41 of housing 4 so that lead wires 2b and 2d do not bend at approximately right angles at the positions where they are drawn out from side surface 41 of housing 4. Protrusion 5a is provided at a position on housing 4 that overlaps only lead wire 2b when viewed in plan from the side surface 41 side from which lead wire 2b is drawn out. Protrusion 5b is provided at a position on housing 4 that overlaps only lead wire 2d when viewed in plan from the side surface 41 side from which lead wire 2d is drawn out.

[0035] Furthermore, protrusion 5a is rod-shaped and overlaps only lead wire 2b. Protrusion 5b is rod-shaped and overlaps only lead wire 2d. The positions and shapes of protrusions 5a and 5b are not limited to those shown in Figure 5(a) and may be any positions and shapes that prevent the radius of curvature of the bent portions of lead wires 2b and 2d from becoming small. Preferably, protrusion 5a has a width greater than that of lead wire 2b, and protrusion 5b has a width greater than that of lead wire 2d in the line width direction.

[0036] Preferably, the protrusion 5a has a portion that is approximately parallel to the line width direction (X direction) of the lead wire 2b, and the protrusion 5b has a portion that is approximately parallel to the line width direction (X direction) of the lead wire 2d. This allows the lead wires 2b and 2d to be bent evenly in the line width direction. Furthermore, each of the protrusions 5a and 5b may be composed of multiple protrusions. Preferably, a line connecting the heights of the multiple protrusions is approximately parallel to the line width direction (X direction) of the lead wires 2b and 2d.

[0037] The side view shown in Figure 5(b) is a side view of coil component 1A when the side surface 42 of the housing 4 is viewed from the front. In coil component 1A, protrusions 6a (third protrusions) and protrusions 6b (fourth protrusions) are provided on the side surface 42 of the housing 4 so that lead wires 3b and 3d do not bend at approximately right angles at the positions where they are drawn out from the side surface 42 of the housing 4. Protrusion 6a is provided at a position on the housing 4 that overlaps only lead wire 3b when viewed in plan from the side surface 42 side from which lead wire 3b is drawn out. Protrusion 6b is provided at a position on the housing 4 that overlaps only lead wire 3d when viewed in plan from the side surface 41 side from which lead wire 3d is drawn out.

[0038] Furthermore, protrusion 6a is rod-shaped and overlaps only lead wire 3b. Protrusion 6b is rod-shaped and overlaps only lead wire 3d. The positions and shapes of protrusions 6a and 6b are not limited to those shown in Figure 5(b) and may be any positions and shapes that prevent the radius of curvature of the bent portions of lead wires 3b and 3d from becoming small. Preferably, protrusion 6a has a width greater than that of lead wire 3b, and protrusion 6b has a width greater than that of lead wire 3d in the line width direction.

[0039] Preferably, the protrusion 6a has a portion that is approximately parallel to the line width direction (X direction) of the lead wire 3b, and the protrusion 6b has a portion that is approximately parallel to the line width direction (X direction) of the lead wire 3d. This allows the lead wires 3b and 3d to be bent evenly in the line width direction. Furthermore, each of the protrusions 6a and 6b may be composed of multiple protrusions. Preferably, the line connecting the heights of the multiple protrusions is approximately parallel to the line width direction (X direction) of the lead wires 3b and 3d. In this way, the protrusions 5, 5a, 5b, 6, 6a, and 6b may have a different shape without being limited to the above-described shape, as long as the protrusions have a structure that increases the bending angle of the lead wires.

[0040] <Modification> In the coil component 1 and coil component 1A described above, protrusions 5 and 6 are provided on the side surfaces 41 and 42 of the housing 4 through which the lead wires 2b, 2d, 3b, and 3d are drawn. However, in order to prevent the radius of curvature of the bent portions of the lead wires 2b, 2d, 3b, and 3d from becoming small, grooves may be provided on the side surfaces 41 and 42 of the housing 4 rather than on the side surfaces 41 and 42 of the housing 4. FIG. 6 is a diagram illustrating the relationship between the bent portion of the lead wire 2b and the depth of the groove 50 in a coil component 1B according to a modification. The relationship between the bent portions of the lead wires 2d, 3b, and 3d and the depth of the groove is also the same as the relationship described in FIG. 6. In addition, in the coil component 1B shown in FIG. 6, the same components as those in the coil component 1 shown in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

[0041] To prevent plating cracks, the position and depth of the groove 50 can be specified so that the elongation of the lead wire 2b at the bent portion is less than approximately 33%. To simplify the calculation, as shown in FIG. 6 , consider a case where X = Z, where X is the depth of the groove 50 from the side surface of the housing 4 on which the groove 50 is provided, Z is the distance from the lead wire 2b's lead-out position on the side surface of the housing 4 to the edge of the groove, and d is the thickness of the lead wire 2b. The range in which X = Z holds may be, for example, X = (0.8 to 1.2)Z. Furthermore, strictly defining the distance Z is the distance from the location 52 closest to the lead wire 2b among the locations where the groove 50 satisfies the height X to the end of the lead wire 2b on the side of the location 52.

[0042] When the above settings are made, assuming that the bent portion of the lead wire 2b has an arcuate shape, the outer length R1 of the lead wire 2b can be calculated as R1 = 2π(X + d) × (1 / 4), and the central length R2 of the lead wire 2b can be calculated as R2 = 2π(X + d / 2) × (1 / 4). Therefore, it is preferable that the ratio (R1 / R2) of the outer length R1 of the lead wire 2b to the central length R2 of the lead wire 2b be less than 4 / 3 (elongation rate less than approximately 33%). In other words, it is preferable to specify the position and depth of the groove 50 so that the relationship R1 / R2 = (X + d) / (X + d / 2) < 4 / 3 is satisfied.

[0043] 6, it has been explained that the groove 50 is provided in the portion of the side surface of the housing 4 from which the lead wire 2b is drawn out, rather than providing a protrusion on the side surface of the housing 4. However, it can also be considered that the coil device 1B shown in FIG. 6 has protrusions on all the side surfaces of the housing 4 except for the portion from which the lead wire 2b is drawn out.

[0044] <Aspects> (1) A coil component according to the present disclosure includes a housing having a pair of first and second main surfaces facing each other and a plurality of side surfaces connecting the first and second main surfaces, and a coil conductor having a portion disposed inside the housing, wherein the coil conductor includes a coil disposed inside the housing and a lead wire connected to the coil, drawn out from the side surface of the housing, and bent along the side surface, and the housing has a protrusion at a position overlapping with the lead wire when viewed in plan from the side surface from which the lead wire is drawn out.

[0045] (2) In the coil component described in (1), the coil conductor is made of a single metal plate, including the coil and the lead wire, and the housing is made of molded resin, including the protruding portion.

[0046] (3) In the coil component described in (1) or (2), when X is the height of the protrusion from the side surface of the housing on which the protrusion is provided, Z is the distance from the lead-out position of the lead-out wire on the side surface of the housing to the protrusion, and d is the thickness of the lead-out wire, and X = Z is satisfied, then (X + d) / (X + d / 2)<4 / 3.

[0047] (4) In the coil component according to any one of (1) to (3), when the height of the protrusion from the side surface of the housing on which the protrusion is provided is X and the thickness of the lead wire is d, the relationship d<X<1 mm is satisfied.

[0048] (5) The coil component according to any one of (1) to (4) includes: the coil conductor includes a first coil conductor and a second coil conductor; the first coil conductor includes a first coil disposed inside the housing and a first lead wire and a second lead wire connected to the first coil; the second coil conductor includes a second coil disposed inside the housing and a third lead wire and a fourth lead wire connected to the second coil; the opening of the first coil overlaps the opening of the second coil when viewed in plan from the first main surface side; and the protrusion includes: a first protrusion having a shape that overlaps both the first lead wire and the second lead wire when viewed in plan from the side surface side from which the third lead wire and the fourth lead wire are drawn; and a second protrusion having a shape that overlaps both the third lead wire and the fourth lead wire when viewed in plan from the side surface side from which the third lead wire and the fourth lead wire are drawn.

[0049] (6) The coil component according to any one of (1) to (4) includes: the coil conductor includes a first coil conductor and a second coil conductor; the first coil conductor includes a first coil disposed inside the housing and a first lead wire and a second lead wire connected to the first coil; the second coil conductor includes a second coil disposed inside the housing and a third lead wire and a fourth lead wire connected to the second coil; the opening of the first coil overlaps the opening of the second coil when viewed in plan from the first main surface side; and the protrusion includes: a first protrusion having a shape overlapping the first lead wire and a second protrusion having a shape overlapping the second lead wire when viewed in plan from the side surface side from which the first and second lead wires are drawn; and a third protrusion having a shape overlapping the third lead wire and a fourth protrusion having a shape overlapping the fourth lead wire when viewed in plan from the side surface side from which the third and fourth lead wires are drawn.

[0050] (7) An electronic device comprising the coil component according to any one of (1) to (6). (8) Another coil component according to the present disclosure comprises: a housing having a pair of first and second main surfaces opposing each other and a plurality of side surfaces connecting the first and second main surfaces; and a coil conductor having a portion disposed inside the housing, wherein the coil conductor has a coil disposed inside the housing and a lead wire connected to the coil, drawn out from the side surface of the housing and bent along the side surface, the housing having a groove on the side surface from which the lead wire is drawn out, wherein X is the depth of the groove from the side surface of the housing on which the groove is provided, Z is the distance from the lead position on the side surface of the housing to the edge of the groove, and d is the thickness of the lead wire, and when X = Z, the relationship (X + d) / (X + d / 2)<4 / 3 holds.

[0051] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0052] 1, 1A, 1B Coil component, 2, 3 Coil conductor, 2a, 3a Coil, 2b, 2d, 3b, 3d Lead wire, 2c, 2e, 3c, 3e End, 4 Housing, 5, 5a, 5b, 6, 6a, 6b Protrusion, 40A, 40B Main surface, 41, 42, 43, 44 Side, 50 Groove.

Claims

1. A coil component comprising: a housing having a pair of first and second principal surfaces opposing each other and a plurality of side surfaces connecting the first and second principal surfaces; and a coil conductor having a portion disposed inside the housing, wherein the coil conductor has a coil disposed inside the housing and a lead wire connected to the coil, which is drawn out from the side surface of the housing and bent along said side surface; and the housing has a protrusion at a position overlapping the lead wire when viewed in plan from the side surface from which the lead wire is drawn out.

2. A coil component according to claim 1, wherein the coil conductor is made of a single metal plate, including the coil and the lead wire, and the housing, including the protrusion, is made of molded resin.

3. A coil component according to claim 1 or 2, wherein, when X = Z, where X is the height of the protrusion from the side surface of the casing on which the protrusion is provided, Z is the distance from the lead-out position of the lead-out wire on the side surface of the casing to the protrusion, and d is the thickness of the lead-out wire, then (X + d) / (X + d / 2)<4 / 3 holds.

4. A coil component according to any one of claims 1 to 3, wherein, when the height of said protrusion from the side surface of said case on which said protrusion is provided is X and the thickness of said lead wire is d, the relationship d<X<1 mm is satisfied.

5. The coil component according to any one of claims 1 to 4, wherein the coil conductors include a first coil conductor and a second coil conductor, the first coil conductor having a first coil disposed inside the housing and first and second lead wires connected to the first coil, the second coil conductor having a second coil disposed inside the housing and third and fourth lead wires connected to the second coil, the opening of the first coil overlaps the opening of the second coil when viewed in plan from the first main surface side, and the protrusions include: a first protrusion having a shape that overlaps both the first lead wire and the second lead wire when viewed in plan from the side surface side from which the third and fourth lead wires are drawn, and a second protrusion having a shape that overlaps both the third and fourth lead wires when viewed in plan from the side surface side from which the third and fourth lead wires are drawn.

6. The coil component according to any one of claims 1 to 4, wherein the coil conductors include a first coil conductor and a second coil conductor, the first coil conductor having a first coil disposed inside the housing and first and second lead wires connected to the first coil, the second coil conductor having a second coil disposed inside the housing and third and fourth lead wires connected to the second coil, the opening of the first coil overlaps the opening of the second coil when viewed in plan from the first main surface side, and the protrusions include: a first protrusion having a shape overlapping the first lead wire and a second protrusion having a shape overlapping the second lead wire when viewed in plan from the side surface side from which the first and second lead wires are drawn, and a third protrusion having a shape overlapping the third lead wire and a fourth protrusion having a shape overlapping the fourth lead wire when viewed in plan from the side surface side from which the third and fourth lead wires are drawn.

7. An electronic device comprising the coil component according to any one of claims 1 to 6.

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