Choking coil

Abstract

A choke coil (10) has a magnetic core, a coil member (30), and a housing (40). The housing (40) has a housing part (46) defined by an upper surface (42) and a side surface (44). The coil member (30) is composed of a lead and has a coil main body portion (32), an extension portion (34), and a terminal portion (36). The coil body (30) is wound around the magnetic core. The magnetic core and the coil main body part (30) are accommodated in the accommodating part (46). The extension section (34) extends from the coil body section (32) and has substantially the same cross-sectional shape as the coil body section (30). The extension part (34) is provided with at least one bending part (341), and the extension part is at least partially led out to the outer side of the accommodating part (46). The terminal section (36) extends from the extension section (34) and has a thickness smaller than the diameter of the extension section (34). The terminal part (36) has an L-shaped shape. A boundary (35) between the terminal portion (36) and the extension portion (34) is located on a side surface (44) of the housing (40).

Description

Choke coil Technical Field

[0001] This invention relates to a choke coil, and more particularly to a surface-mount choke coil. Background Technology

[0002] Patent document 1 discloses an example of a surface-mount choke coil.

[0003] The choke coil in Patent Document 1 comprises: a closed magnetic circuit core consisting of a plate-shaped magnetic core and a concave magnetic core; and two coils concentrically wound. The coils are mounted on the central magnetic post of the concave magnetic core and housed within the closed magnetic circuit core. The lead ends of the coils are formed into a plate shape by rolling. A claw portion is formed at the tip of the lead end. The lead ends extend outward from the closed magnetic circuit core and are positioned along a guide groove formed on the outer side of the concave magnetic core. The claw portion of the lead end is accommodated in a recess formed on the outer bottom surface of the concave magnetic core.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2000-021655. Summary of the Invention

[0007] The problem the invention aims to solve

[0008] In the choke coil of Patent Document 1, the lead end (plate-like portion) extends from the interior of the closed magnetic circuit core. In other words, the closed magnetic circuit core partially houses the lead end. Therefore, the closed magnetic circuit core of the choke coil of Patent Document 1 has a larger size than is required to house the coil.

[0009] The purpose of this invention is to provide a choke coil that can be further miniaturized.

[0010] Solution for solving the problem

[0011] One aspect of the present invention provides a choke coil, which, as a first choke coil, has a magnetic core, a coil component, and a housing.

[0012] The housing has an upper surface and side surfaces extending downward from the upper surface, and has a receiving portion defined by the upper surface and the side surfaces.

[0013] The coil component is composed of leads and has a coil body, an extension, and a terminal.

[0014] The main body of the coil is wound around the magnetic core.

[0015] The magnetic core and the main body of the coil are housed in the housing.

[0016] The extension portion extends from the coil body portion and has a cross-sectional shape substantially the same as the coil body portion.

[0017] The extension has at least one curved portion, and the extension extends at least partially to the outside of the receiving portion.

[0018] The terminal portion extends from the extension portion and has a thickness smaller than the diameter of the extension portion.

[0019] The terminal portion has an L-shaped form.

[0020] The boundary between the terminal portion and the extension portion is located on the side of the housing.

[0021] Invention Effects

[0022] In one aspect of the choke coil of the present invention, the coil component is composed of leads and has a coil body portion, an extension portion, and a terminal portion. The coil body portion is wound around a magnetic core and housed together with the magnetic core in a housing portion of a casing. The extension portion extends from the coil body portion and extends at least partially to the outside of the housing portion. The terminal portion extends from the extension portion. The boundary between the terminal portion and the extension portion is located on the side of the casing. Because the terminal portion is located on the outside of the casing, the choke coil of one aspect of the present invention can be miniaturized compared to conventional choke coils where the terminal portion extends from inside the casing to the outside.

[0023] By studying the following description of the preferred embodiments while referring to the accompanying drawings, one can accurately understand the purpose of the present invention and gain a more complete understanding of its structure. Attached Figure Description

[0024] Figure 1 is a bottom perspective view of the choke coil according to the first embodiment of the present invention.

[0025] Figure 2 is a perspective view of the upper surface of the choke coil in Figure 1.

[0026] Figure 3 is a bottom view of the choke coil in Figure 1.

[0027] Figure 4 is a top view showing the choke coil in Figure 1.

[0028] Figure 5 is a bottom perspective view showing the core housing used to house the choke coil of Figure 1 and the leads partially wound around the core housing.

[0029] Figure 6 is a bottom perspective view of the assembly after combining the magnetic core housing and leads from Figure 5 with the housing.

[0030] Figure 7 is a top view showing the components of Figure 6.

[0031] Figure 8 is a perspective view of the upper surface of the component shown in Figure 6. The lead wire bends along the upper groove of the housing.

[0032] Figure 9 is a perspective view of the upper surface of the component in Figure 8. The ends of the leads are cut and stamped.

[0033] Figure 10 is a perspective view of the upper surface of the choke coil according to the second embodiment of the present invention.

[0034] Figure 11 is a bottom-view perspective view of the choke coil in Figure 9. Detailed Implementation

[0035] This invention can be implemented in various modifications and methods. As an example of this invention, a specific embodiment as shown in the accompanying drawings will be described in detail below. The drawings and embodiments are not intended to limit the invention to the specific methods disclosed herein. All modifications, equivalents, and alternatives made within the scope set forth in the appended claims are included within the protection scope of this invention.

[0036] (First Implementation)

[0037] Referring to Figures 1 to 4, the choke coil 10 of the first embodiment of the present invention includes: a magnetic core (not shown) housed in a magnetic core housing 20, two coil members 30, and a housing 40. In this embodiment, the choke coil 10 is a common-mode choke coil. However, the present invention is not limited thereto. The choke coil of the present invention may also be a normal-mode choke coil having one coil member 30.

[0038] Referring to Figures 3 and 5, the magnetic core (not shown) housed in the core housing 20 is made of ferromagnetic material and has a closed loop shape. In this embodiment, the magnetic core is a toroidal core with a circular loop shape. However, the invention is not limited to this. The magnetic core may also be in the shape of a running track, an oblong shape, or an elliptical shape. However, a toroidal core is preferred to obtain the desired magnetic properties. Furthermore, if the choke coil 10 is a standard choke coil, the magnetic core may also have a gap.

[0039] As shown in Figures 3 and 5, the core housing 20 is made of insulating resin and has an annular portion 22, a protrusion 24, and a frame portion 26. The annular portion 22 is hollow and houses the magnetic core (not shown). The protrusion 24 protrudes radially outward from the annular portion 22. The protrusion 24 restricts the movement of the coil member 30 wound on the core housing 20. The frame portion 26 surrounds the annular portion 22 in a manner that divides the annular portion 22 into two parts. As can be understood from Figure 3, the frame portion 26 has an asymmetrical shape, and the housing 40 has a recess corresponding to the shape of the frame portion 26. Therefore, the core housing 20 must be inserted into the housing 40 in the appropriate orientation. That is, when the core housing 20 is housed in the housing 40, the frame portion 26 functions as a guide. As a result, the lead wire 300 can be easily and accurately inserted into the hole 421 (see Figure 4). In this way, the frame portion 26 facilitates the assembly of the choke coil 10 and prevents assembly errors. Furthermore, the frame portion 26 of the core housing 20 and the recess of the housing 40 restrict the movement of the core housing 20 relative to the housing 40 after the core housing 20 is housed in the housing 40. Additionally, to prevent movement of the core housing 20 relative to the housing 40, the core housing 20 may also be fixed to the housing 40 using an adhesive or similar material.

[0040] As shown in Figures 1 to 4, each coil component 30 has a coil body portion 32, two extension portions 34, and two terminal portions 36. In each coil component 30, the coil body portion 32 is located in the center of the coil component 30 (between the two extension portions 34) and is wound around a magnetic core (not shown) with respect to the magnetic core housing 20. The extension portions 34 extend from both ends of the coil body portion 32. The terminal portions 36 extend from the extension portions 34. The terminal portions 36 are located at both ends of the coil component 30. In the following description, unless otherwise specified, the description of one coil component 30 also applies to the other coil component 30. Furthermore, unless otherwise specified, the description of one extension portion 34 also applies to the remaining extension portions 34, and the description of one terminal portion 36 also applies to the remaining terminal portions 36.

[0041] As can be understood from Figures 1 and 2, the housing 40 is a component made of thermosetting resin. The housing 40 has an upper surface 42 and side surfaces 44. The side surfaces 44 extend downward from the upper surface 42. In this embodiment, the side surfaces 44 are composed of four side portions 441, 443, 445, and 447. However, the invention is not limited to this. The side surfaces 44 can also be other shapes such as polygonal cylinders or cylindrical shapes. In this embodiment, the vertical direction is the Z-direction. The +Z direction is upward, and the Z-direction is downward.

[0042] As can be understood from Figures 1 and 3, the upper surface 42 and the side surface 44 define the receiving portion 46. In other words, the housing 40 has the receiving portion 46 defined by the upper surface 42 and the side surface 44. In this embodiment, the housing 40 is open downwards. In other words, in this embodiment, the housing 40 does not have a bottom surface. However, the invention is not limited thereto. The housing 40 may also have a bottom surface. However, as long as the insulation between the coil body portion 32 and the substrate can be ensured when the choke coil 10 is mounted on the substrate (not shown), it is possible to reduce manufacturing costs and simplify the manufacturing process, so it is preferable that the housing 40 does not have a bottom surface.

[0043] As shown in Figures 1 and 3, a core housing 20 housing a magnetic core (not shown) and a coil body portion 32 are housed within a receiving portion 46 of a housing 40. As shown in Figures 1, 2, and 4, each extension portion 34 extends at least partially outward from the receiving portion 46. Each extension portion 34 has at least one bend 341 extending along the upper surface 42 and side surface 44 of the housing 40. In this embodiment, each extension portion 34 has two or three bends 341. A terminal portion 36 extends from the side surface 44 of the housing 40 toward the lower side of the housing 40.

[0044] Referring to Figures 4 and 7, at least two holes 421 are provided on the upper surface 42 of the housing 40. In this embodiment, four holes 421 are provided on the upper surface 42 of the housing 40. The holes 421 are divided into two groups. Each group of holes 421 corresponds to a coil member 30. Each group of holes 421 corresponds to an extension 34 of the corresponding coil member 30. The extension 34 of the coil member 30 is led out from the receiving portion 46 of the housing 40 to the upper surface 42 of the housing 40 through the corresponding hole 421.

[0045] As shown in Figures 4 and 7, at least two upper grooves (grooves) 423 are formed on the upper surface 42 of the housing 40. In this embodiment, four upper grooves 423 are formed on the upper surface 42 of the housing 40. Furthermore, in this embodiment, the upper grooves 423 are grooves that are partially without a bottom. The upper grooves 423 correspond to holes 421 respectively. The upper grooves 423 also correspond to extensions 34 respectively. The upper grooves 423 extend from the corresponding holes 421 to the side surface 44 of the housing 40, and have an end portion 425 at a position away from the holes 421. In this embodiment, each extension 34 is at least partially accommodated in the corresponding upper groove 423 and extends along the upper groove 423.

[0046] As can be understood from Figures 1, 2, and 3, the side portions 441, 443, 445, and 447 constituting side surface 44 face different directions. Side portions 441 and 443 face forward and rearward respectively in the front-rear direction, which is orthogonal to the vertical direction. Side portions 445 and 447 face outward in the lateral direction, which is orthogonal to both the vertical and front-rear directions. In this embodiment, the front-rear direction is the X direction. The -X direction is forward, and the +X direction is rearward. The lateral direction is the Y direction.

[0047] As shown in Figures 1 to 4 and Figure 6, side grooves 451, which are continuous with the upper groove (groove portion) 423, are formed on the side surface 44 of the housing 40. In this embodiment, two side grooves 451 are formed on the side surfaces 441 and 443 respectively. The side grooves 451 extend vertically from the end 425 of the upper groove 423 to the lower end of the housing 40. The extension portion 34 of the coil member 30 is partially accommodated in the corresponding side groove 451 and extends along the side groove 451.

[0048] As shown in Figure 1, each terminal portion 36 is bent into an L-shape. In other words, the terminal portion 36 has a first portion 361 extending from the extension portion 34 and a second portion 363 extending from the first portion 361. The first portion 361 extends vertically and is accommodated in the side groove 451. The second portion 363 is located on the lower side of the housing 40 and extends in the front-rear direction. Furthermore, the second portion 363 protrudes downward from the lower end of the housing 40. Since the terminal portion 36 protrudes downward from the lower end of the housing 40, when the choke coil 10 is mounted on the substrate (not shown), only the terminal portion 36 contacts the substrate. At this time, the housing 40, the magnetic core housing 20, and the coil body portion 32 do not contact the substrate. That is, the choke coil 10 is supported only by the terminal portion 36. In this embodiment, although the choke coil 10 is supported only by the terminal portion 36, no reduction in mounting strength has been found, and the terminal portion 36 can be reliably connected to the substrate. However, the present invention is not limited to this. The lower end of the housing 40 may also contact the substrate. However, by adopting a structure in which only the terminal portion 36 contacts the substrate, the insulation between the coil body portion 32 and the substrate can be ensured more reliably, even if the housing 40 does not have a bottom surface, and is therefore preferred.

[0049] As shown in Figures 1 and 2, the boundary 35 between the extension 34 and the terminal portion 36 is located on the side 44 of the housing 40 or within the side groove 451. Near the boundary 35, the extension 34 and the terminal portion 36 extend in the same direction (vertical direction). In other words, the coil member 30 does not bend at the boundary 35. Here, the cross-sectional shapes of the extension 34 and the terminal portion 36 are different from each other. When the coil member 30 bends at the boundary 35 with such different cross-sectional shapes, a reduction in strength is likely to occur in that part. In this embodiment, the coil member 30 extends straight near the boundary 35, thus preventing such a reduction in strength. Furthermore, the terminal portion 36 as a whole or the boundary 35 is located outside the housing 40, so miniaturization can be achieved compared to conventional choke coils where the terminal portion extends from the inside to the outside of the housing.

[0050] As can be understood from Figure 5, each coil component 30 is composed of a lead wire 300. In other words, the lead wire 300 is used in the manufacture of the choke coil 10. In this embodiment, the lead wire 300 is an integral component consisting of a single conductor (not shown) and an insulating film (not shown) covering the conductor.

[0051] As shown in Figure 5, during manufacturing, a portion of the lead wire 300 is wound around the core housing 20. The portion of the lead wire 300 wound around the core housing 20 forms the coil body portion 32. The extension portion 34 extends from the coil body portion 32. The terminal portion 36 is formed by subsequently performing stamping and bending processes on a portion of the lead wire 300.

[0052] As can be understood from Figure 5, there is no clear boundary between the coil body portion 32 and the portion that becomes the extension portion 34. Therefore, the extension portion 34 has a substantially identical cross-sectional shape to the coil body portion 32. Here, "the extension portion 34 and the coil body portion 32 have substantially the same cross-sectional shape" means that, except for the portion deformed due to bending processing, their cross-sectional shapes are the same. In addition, in this embodiment, its cross-sectional shape is circular.

[0053] As can be understood from Figures 6 and 7, during the manufacture of the choke coil 10, the core housing 20 with the leads 300 wound around it is inserted into the receiving portion 46 from below the housing 40. Thus, the core housing 20, which houses the magnetic core (not shown), and the coil body 32 are housed in the receiving portion 46. At this time, both ends of each lead 300 are led out of the housing 40 through the corresponding holes 421.

[0054] Here, the diameter of the conductor (not shown) of the lead wire 300 used in the coil component 30 can be determined according to the application of the choke coil 10. In this embodiment, in order to handle a large specified current, the conductor diameter is 0.8 mm or more. Furthermore, in this embodiment, considering ease of processing, the conductor diameter is 1.8 mm or less.

[0055] Furthermore, the inner diameter of the hole 421 in the housing 40 is slightly larger than the outer diameter of the coil member 30. Preferably, the inner diameter of the hole 421 is smaller. This is to suppress the reduction in strength of the housing 40 and to suppress heat from entering the housing 40 during the reflow soldering process of mounting the choke coil 10 onto a substrate (not shown).

[0056] As shown in Figure 8, the lead wire 300 is bent along the corresponding upper groove (groove portion) 423 and partially accommodated in the upper groove 423. Then, the end of the lead wire 300 is cut to an appropriate length. Solder (not shown) is formed on the surface of the cut end of the lead wire 300 as needed. By forming the solder, the insulating coating of the portion of the lead wire 300 that becomes the terminal portion 36 (see Figure 9) is removed. Without forming solder, it is necessary to remove the insulating coating of the portion of the lead wire 300 that becomes the terminal portion 36.

[0057] As shown in Figure 9, the end of the lead 300 (refer to Figure 8) is stamped to form a plate-shaped portion 38 that becomes a terminal portion 36. At this time, a boundary 35 is formed between the extension portion 34 of the coil member 30 and the terminal portion 36. Since only a limited area of ​​the lead 300, i.e., the portion that becomes the terminal portion 36, is stamped, a small stamping machine can be used. Furthermore, the ends of multiple leads 300 can be stamped simultaneously.

[0058] As can be understood from Figures 9, 1, and 2, the plate-shaped portion 38 is then bent to form the terminal portion 36. In this way, the terminal portion 36 is formed by bending after the conductor of the lead 300 (see Figure 8) has been stamped. In other words, the terminal portion 36 is not a separate component connected to the lead 300 by welding or the like. In this embodiment, the terminal portion 36 is at least partially covered by solder. Alternatively, solder formation can be performed after the terminal portion 36 has been formed. However, when solder is formed after stamping, problems such as uneven solder distribution can easily occur; therefore, as described above, it is preferable to perform the soldering before stamping.

[0059] As can be understood from Figure 9, the thickness of the plate-shaped portion 38 that becomes the terminal portion 36 is smaller than the diameter of the extension portion 34. Specifically, the thickness of the plate-shaped portion 38 is more than 1 / 4 and less than 3 / 4 of the diameter of the extension portion 34. For example, the thickness of the plate-shaped portion 38 can be more than 0.2 mm and less than 0.6 mm. This is because if the thickness of the plate-shaped portion 38 is too small, the solder is prone to cracking during bending. Furthermore, if the thickness of the plate-shaped portion 38 is too large, bending becomes difficult. In this embodiment, the thickness of the terminal portion 36 is equal to the thickness of the plate-shaped portion 38. That is, in this embodiment, the size of the terminal portion 36 is more than 1 / 4 and less than 3 / 4 of the diameter of the extension portion 34. Furthermore, in this embodiment, the thickness of the terminal portion 36 can be more than 0.2 mm and less than 0.6 mm.

[0060] As can be understood from Figures 9 and 2, the extension 34 is further bent along the corresponding side groove 451. Thus, the first portion 361 of the terminal portion 36 is accommodated in the side groove 451. As a result, the distance between the two terminal portions 36 of each coil member 30 is determined. Since the distance between the terminal portions 36 depends on the size of the housing 40, the deviation for each product is small. In this way, according to this embodiment, for each coil member 30, the distance (pitch) between the terminal portions 36 can be determined with high precision by a simple process such as bending the extension 34.

[0061] As can be understood from Figure 7, the distance D1 between the ends 425 of the two upper slots 423 extending from the two holes 421 of each group is longer than the distance D2 between the two holes 421 of each group. The side slots 451 extend in the vertical direction, so the distance between the side slots 451 in the front-back direction depends on the distance D1 between the ends 425 of the upper slots 423. As a result, as can be understood from Figures 3 and 4, the distance between the terminal portions 36 of the coil member 30 in the front-back direction depends on the distance D1 between the ends 425 of the upper slots 423, which is longer than the distance D2 between the holes 421. In this way, according to this embodiment, the distance between the terminal portions 36 can be longer than the distance between the extension portions 34 extending to the outside of the housing 40 (holes 421). This is beneficial for ensuring insulation between the pads connected to the terminal portions 36 when the choke coil 10 is mounted on the substrate. Moreover, since the distance between the terminal portions 36 depends on the distance D1 between the ends 425, deviation is less likely to occur. Therefore, this structure is beneficial for miniaturization of the choke coil 10.

[0062] As can be understood from Figure 2, in this embodiment, the extension 34 extends from the upper surface 42 of the housing 40 to the side surface 44. In other words, in this embodiment, the coil member 30 is arranged such that the portion of the coil member 30 exposed outside the housing 40 becomes longer. As a result, the heat generated by the coil member 30 is efficiently dissipated to the outside of the housing 40. Therefore, the choke coil 10 structure of this embodiment has excellent heat dissipation efficiency and is suitable for high-current applications.

[0063] (Second Implementation)

[0064] Referring to Figures 10 and 11, the choke coil 10A of the second embodiment of the present invention differs from the choke coil 10 of the first embodiment in that it has a housing 40A instead of a housing 40.

[0065] As can be understood from Figures 10 and 11, the housing 40A has a main body 400 and a top cover 410. The main body 400 has a bottom surface 402 and a side surface 404 extending upward from the bottom surface 402. The main body 400 is open upward, having an upper opening (not shown). The top cover 410 is combined with the main body 400 to block the upper opening of the main body 400. The top cover 410 and the side surface 404 of the main body 400 define a receiving portion (not shown) that houses the magnetic core housing (not shown) and the coil body portion (not shown) of the coil member 30.

[0066] As shown in Figures 10 and 11, in this embodiment, each extension 34 of the coil member 30 extends downward from the upper end of the side surface 404 of the housing 40A. Similarly, in this invention, the extension 34 may also extend outward from the side surface 404 of the housing 40A, along the side surface 404. However, as in the choke coil 10 of the first embodiment, the coil member 30 extends from the upper surface 42 of the housing 40, resulting in a longer portion exposed outside the housing 40 and superior heat dissipation.

[0067] As shown in Figures 10 and 11, in this embodiment, the boundary 35 between the extension portion 34 and the terminal portion 36 is also located on the side surface 404 of the housing 40A. Furthermore, near the boundary 35, the extension portion 34 and the terminal portion 36 extend in the same direction. In other words, the lead wire does not bend at the boundary 35 between the flattened and unflattened portions. Therefore, a predetermined strength can be maintained at the boundary 35 of the coil member 30. Moreover, since the terminal portion 36 as a whole or its boundary 35 is located outside the housing 40A, it can be miniaturized compared to conventional choke coils where the terminal portion extends from the inside to the outside of the housing.

[0068] The present invention has been described above by listing several embodiments, but the present invention is not limited to the above embodiments. Various modifications and alterations can be made without departing from the spirit of the present invention.

[0069] For example, in the above embodiment, a coil member 30 (lead wire 300) is wound on a core housing 20 that houses the magnetic core (not shown), but the coil member 30 (lead wire 300) can also be wound on a magnetic core (coated core) whose surface is coated with an insulating coating.

[0070] Furthermore, in the above embodiment, the housing 40 is made of thermosetting resin, but the housing 40 may also be made of other insulating materials such as ceramics.

[0071] This invention is based on Japanese Patent Application No. 2023-171545, filed with the Japan Patent Office on October 2, 2023, the contents of which form part of this specification by reference.

[0072] While the preferred embodiments of the invention have been described, it will be apparent to those skilled in the art that modifications can be made to the embodiments without departing from the spirit of the invention, and such modifications are within the scope of the invention.

[0073] Explanation of reference numerals in the attached figures

[0074] 10: Choke coil;

[0075] 20: Core housing;

[0076] 22: Annular portion;

[0077] 24: convex part;

[0078] 26: Frame section;

[0079] 30: Coil components;

[0080] 300: Lead wire;

[0081] 32: Main body of the coil;

[0082] 34: Extension;

[0083] 341: Bend;

[0084] 35: Boundary;

[0085] 36: Terminal section;

[0086] 361: First part;

[0087] 363: Second part;

[0088] 38: plate-shaped part;

[0089] 40, 40A: Housing;

[0090] 400: Main body;

[0091] 402: Bottom;

[0092] 404: Side view;

[0093] 410: Top cover;

[0094] 42: Upper surface;

[0095] 421: Hole;

[0096] 423: Upper groove (groove section);

[0097] 425: end;

[0098] 44: Side view;

[0099] 441, 443, 445, 447: Side profile;

[0100] 451: Side groove;

[0101] 46: Reception portion. Claims (as amended under Article 19 of the Treaty) 1. (Amended) A choke coil having a magnetic core, a coil member, and a housing having an upper surface and a side extending downward from the upper surface, and having a reception portion defined by the upper surface and the side surface, the coil member being formed of leads and having a coil body portion, an extension portion, and a terminal portion, the coil body portion being wound around the magnetic core, the magnetic core and the coil body portion being received in the reception portion, the extension portion extending from the coil body portion, the extension portion having at least one bend, the extension portion extending at least partially to the outside of the reception portion, and the terminal portion extending from the extension portion having a thickness smaller than the diameter of the extension portion. 2. The choke coil according to claim 1, wherein the magnetic core has a closed loop shape. 3. The choke coil according to claim 1 or 2, wherein the terminal portion is at least partially covered by solder, and the thickness of the terminal portion is more than 1 / 4 and less than 3 / 4 of the diameter of the extension portion. 4. The choke coil according to claim 3, wherein the thickness of the terminal portion is 0.2 mm or more and 0.6 mm or less. 5. The choke coil according to any one of claims 1 to 4, wherein at least two holes are provided on the upper surface of the housing, and the extension portion extends through the holes to the upper surface of the housing. 6. The choke coil according to claim 5, wherein at least two grooves, each continuous with the holes, are further formed on the upper surface of the housing, each groove having an end away from the hole, and the distance between the ends being longer than the distance between the holes. 7. The choke coil according to any one of claims 1 to 6, wherein the housing is composed of a single component, and the terminal portion protrudes downward from the lower end of the housing. 8. (Additionally) The choke coil according to any one of claims 1 to 7, wherein the extension portion has a cross-sectional shape substantially the same as the coil body portion, the terminal portion has an L-shaped shape, and the boundary between the terminal portion and the extension portion is located on the side surface of the housing.

Claims

1. A choke coil having a magnetic core, a coil member, and a housing, the housing having an upper surface and a side extending downward from the upper surface, and having a receiving portion defined by the upper surface and the side surface, the coil member being formed of leads and having a coil body portion, an extension portion, and a terminal portion, the coil body portion being wound around the magnetic core, the magnetic core and the coil body portion being received in the receiving portion, the extension portion extending from the coil body portion having a cross-sectional shape substantially the same as the coil body portion, the extension portion having at least one bend, the extension portion extending at least partially to the outside of the receiving portion, the terminal portion extending from the extension portion having a thickness dimension smaller than the diameter dimension of the extension portion, the terminal portion having an L-shaped shape, and the boundary between the terminal portion and the extension portion being located on the side surface of the housing.

2. The choke coil according to claim 1, wherein, The magnetic core has a closed loop shape.

3. The choke coil according to claim 1 or 2, wherein, The terminal portion is at least partially covered by solder, and the thickness of the terminal portion is more than 1 / 4 and less than 3 / 4 of the diameter of the extension portion.

4. The choke coil according to claim 3, wherein, The thickness of the terminal portion is 0.2 mm or more and 0.6 mm or less.

5. The choke coil according to any one of claims 1 to 4, wherein, At least two holes are provided on the upper surface of the housing, and the extension extends through the holes to the upper surface of the housing.

6. The choke coil according to claim 5, wherein, At least two grooves, each continuous with the hole, are also formed on the upper surface of the housing. Each groove has an end that is away from the hole, and the distance between the ends is longer than the distance between the holes.

7. The choke coil according to any one of claims 1 to 6, wherein, The housing is composed of a single component, with the terminal portion protruding downwards from the lower end of the housing.

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