Coil component and method of manufacturing the same

Abstract

To reduce the size of a coil component, to minimize variations in dimensions and leakage inductance, and to reduce a dimensional tolerance. To facilitate the thinning of a core case or the like and the automation of the manufacturing process of a thick conductor in particular.SOLUTION: The coil includes one or two or more U-shaped coil conductors 3o. having a mounting port 3x mountable to a core part 2 and sequentially arrangeable in the circumferential direction Ff of the core part 2. A coil part 3 is constituted by connecting one end side 3x of a mounting port side 3o of an arbitrary coil conductive 3xs to the other end side 3x of the mounting port side 3o of the other adjacent coil conductive 3xt by a connection conductive 3y, or by bending one end side 3x of the mounting port side 3o of the arbitrary coil conductive to connect a tip side of the one end side to the other end side of the mounting port side of the other adjacent coil conductive. 3xt 3xs 3o 3xs 3x 3es.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coil component including a cylindrical core portion and a coil portion formed by winding a conductor around the core portion, and to a method for manufacturing the same. [Background technology]

[0002] Conventionally, a choke coil has been known that has a coil unit wound with magnet wire and that is fixed to a base, and in particular, a common mode choke coil with a base described in Patent Document 1 is known as a common mode choke coil that has a pair of independent coil parts.

[0003] The common mode choke coil with pedestal of Patent Document 1 aims to provide a common mode choke coil with pedestal that can be easily fixed to the pedestal without using adhesive and without causing variations in the external dimensions or component fixing positions. Specifically, it comprises a common mode choke coil formed by winding a pair of conductors around the outer peripheral surface of a ring-shaped core, and an insulating pedestal that holds and fixes the common mode choke coil. The pedestal has a substrate on the front side of which the common mode choke coil is placed, and the substrate has first and second notches corresponding to each end of the conductors, and a recessed groove formed on the back side of the substrate that connects the first and second notches. In particular, the conductor (magnet wire) that makes up the coil is made of copper wire with a circular cross section. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2016-082178 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the above-mentioned conventional common mode choke coil, or more generally, conventional coil components, have the following problems.

[0006] First, because they are typically constructed by winding a circular cross-section conductor wire, typically 2-3 mm in diameter, around the outer surface of a ring-shaped core, the manufacturing process is time-consuming and complex, and it is not easy to automate the manufacturing process, especially for thick conductor wires. Ultimately, this leads to a decrease in productivity due to the increased number of production steps, and even a decrease in production efficiency. Furthermore, because the stress on the core during manufacturing is excessive, it is necessary to increase the thickness of the core case (coil bobbin) that covers the core to increase its strength.

[0007] Second, the manufactured coil components are prone to bulging due to bending, which increases the overall dimensions of the coil components. Furthermore, as the dimensional variations increase, so do the variations in leakage inductance, making it difficult to narrow the dimensional tolerances. Furthermore, the variations in the bent portions of the coil make it difficult to design for heat dissipation, resulting in poor heat dissipation.

[0008] An object of the present invention is to provide a coil component and a method for manufacturing the same that solves the problems present in the background art. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the coil component 1 of the present invention is characterized in that, when constructing a coil component comprising a cylindrical core portion 2 and a coil portion 3 in which a conductor is wound around this core portion 2, the coil portion 3 has an attachment port 3o that can be attached to the core portion 2 and is provided with one or more U-shaped coil conductors 3x... that can be sequentially arranged in the circumferential direction Ff of the core portion 2, and the coil portion 3 is constructed by connecting one end 3xs at the attachment port 3o of any coil conductor 3x to the other end 3xt at the attachment port 3o of the adjacent other coil conductor 3x with a connecting conductor 3y, or by bending the one end 3xs side at the attachment port 3o of any coil conductor 3x to connect the tip 3es on the one end 3xs side to the other end 3xt at the attachment port 3o of the adjacent other coil conductor 3x.

[0010] Furthermore, in order to solve the above-mentioned problems, the manufacturing method of the coil component 1 according to the present invention is characterized in that, when manufacturing a coil component 1 having a coil portion 3 in which a conductor is wound around a cylindrical core portion 2, the method has an attachment port 3o that can be attached to the core portion 2 and includes one or more U-shaped coil conductors 3x... that can be sequentially arranged in the circumferential direction Ff of the core portion 2, and after the coil conductors 3x... are attached to the core portion 2, the coil portion 3 is manufactured by connecting one end 3xs of the attachment port 3o of any coil conductor 3x to the other end 3xt of the attachment port 3o of the adjacent other coil conductor 3x with a connecting conductor 3y, or by bending the one end 3xs side of the attachment port 3o of any coil conductor 3x and connecting the tip 3es on the one end 3xs side to the other end 3xt of the attachment port 3o of the adjacent other coil conductor 3x.

[0011] On the other hand, in a preferred embodiment of the present invention, the core unit 2 can be configured with a core case 11 that covers the core body 2m and has positioning portions 11s... on the outer periphery that position the coil conductor 3x. The coil conductor 3x can be a flat conductor Ps with a rectangular cross section. Furthermore, the coil unit 3x can include at least one of a common mode choke coil 1c and a normal mode choke coil. On the other hand, the coil unit 3 can be configured with a heat dissipation portion 12 that is made of a heat dissipation material and that dissipates heat by contacting an end face 3u of the coil conductor 3x. [Effects of the Invention]

[0012] The coil component 1 having such a configuration or the manufacturing method thereof according to the present invention provides the following significant effects.

[0013] (1) Each coil conductor 3x... can be attached to the outer circumferential surface of the core portion 2 simply by fitting it in one direction, facilitating manufacturing and significantly shortening manufacturing time, thereby improving productivity and production efficiency. Additionally, stress on the core portion 2 during manufacturing can be reduced, facilitating the thinning of core cases and automating the manufacturing process for particularly thick conductors. Furthermore, because the U-shaped coil conductors 3x... are arranged along the outer circumferential surface of the core portion 2, no bulging occurs during manufacturing of the coil portion. This allows for the miniaturization of the coil component 1, minimizes dimensional variations and leakage inductance variations, and reduces dimensional tolerances.

[0014] (2) When manufacturing the coil component 1, one end 3xs at the mounting opening 3o of any coil conductor 3x is connected to the other end 3xt at the mounting opening 3o of the adjacent other coil conductor 3x by the connecting conductor 3y. This eliminates the need for bending the coil conductors 3x, etc. during manufacturing, thereby reducing the number of manufacturing steps and contributing to easier and more efficient manufacturing.

[0015] (3) When manufacturing the coil component 1, one end 3xs side of the mounting opening 3o of any coil conductor 3x is bent so that the tip 2es on the one end 3xs side is connected to the other end 3xt of the mounting opening 3o of the other adjacent coil conductor 3x. This reduces the number of welding operations for one coil conductor 3x during manufacturing by half, thereby reducing manufacturing labor and contributing to easier and more efficient manufacturing.

[0016] (4) In a preferred embodiment, when constructing the coil component 1, the core portion 2 is configured to include a core case portion 11 that covers the core main body portion 2m and has positioning portions 11s... that position the coil conductors 3x on the outer periphery. This allows each coil conductor 3x... to be positioned by the positioning portions 11s... such as grooves formed in the core case portion 11, thereby improving productivity and further improving production efficiency, and contributing to further reducing dimensional variation and improving quality.

[0017] (5) In a preferred embodiment, when constructing the coil component 1, if the coil conductor 3x is made of a flat rectangular conductor Ps having a rectangular cross section, it can be manufactured by punching a plate material such as a copper plate. This makes it possible to easily manufacture the coil conductor 3x and the connecting conductor 3y, thereby improving productivity and mass production.

[0018] (6) In a preferred embodiment, when constructing the coil component 1, if the coil portion 3x includes at least one of a common mode choke coil 1c and a normal mode choke coil, the coil component 1 can be applied to various types of coils, resulting in excellent versatility and expandability.

[0019] (7) In a preferred embodiment, when constructing the coil component 1, the coil portion 3 is provided with a heat dissipation portion 12 formed of a heat dissipation material on the end face 3u of the coil conductor 3x, which dissipates heat by contact. This eliminates unnecessary bent portions (uneven portions) on the end face of the coil conductor 3x, thereby facilitating efficient heat dissipation design and further improving heat dissipation performance. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a bottom view of a coil component according to a preferred embodiment of the present invention; FIG. [Figure 2] AA end view in FIG. 1 of the coil component; [Figure 3] FIG. 2 is an explanatory diagram of a method for assembling the coil conductor and the connecting conductor of the coil component; [Figure 4] 1 is a plan view of a core case used in the coil part; [Figure 5] FIG. 2 is an explanatory diagram of a method for connecting the coil conductor and the connecting conductor of the coil component; [Figure 6] FIG. 2 is an external perspective view of the coil component; [Figure 7] An explanatory diagram of the heat dissipation structure of the coil component; [Figure 8] A flowchart illustrating a method for manufacturing the coil component; [Figure 9] 10 is a front view of a coil conductor used in a manufacturing method according to a modified example of the coil component; [Figure 10] 10 is a bottom view illustrating a method for assembling the coil conductor used in the manufacturing method according to the modified example; [Figure 11] A flowchart for explaining the manufacturing method according to the modified example. [Figure 12] 10 is a front view of another coil conductor used in the manufacturing method according to the modified example; [Figure 13] 10 is a front view of another coil conductor used in the manufacturing method according to the modified example; DETAILED DESCRIPTION OF THE INVENTION

[0021] Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0022] In this embodiment, an example in which the coil component 1 is applied to a common mode choke coil 1c shown in Fig. 6 is shown. Note that various types of coils, such as this common mode choke coil 1c as well as normal mode choke coils, can be applied to the coil component 1, and the coil component 1 according to this embodiment is highly versatile and expandable.

[0023] First, the main components constituting the coil component 1 according to this embodiment will be specifically described with reference to FIGS.

[0024] The coil component 1 includes, as main components, a cylindrical core portion 2 and a coil portion 3 formed by winding a conductor around the core portion 2.

[0025] As shown in Figure 2, the core portion 2 comprises a core main body portion 2m formed into a cylindrical shape using, for example, a nanocrystal core, and a core case portion 11 that covers the entire core main body portion 2m and has positioning portions 11s... on the outer periphery that position the coil conductor 3x described later.

[0026] 4, the positioning portions 11s are formed by grooves 11sc arranged in sequence at predetermined intervals in the circumferential direction Ff on the outer periphery of the core case portion 11. The core case portion 11 can be made of an electrically insulating synthetic resin material and can be formed, for example, by combining a container portion and a lid portion.

[0027] In this way, by configuring the core portion 2 with a core case portion 11 that covers the core main body portion 2m and has positioning portions 11s... that position the coil conductors 3x on the outer periphery, each coil conductor 3x... can be positioned by the positioning portions 11s... such as grooves formed in the core case portion 11, which can improve productivity and further improve production efficiency, as well as contribute to further reducing dimensional variation and improving quality.

[0028] On the other hand, as shown in Figures 1 and 3, the coil portion 3 has an attachment port 3o for the core portion 2, and is equipped with one or more U-shaped coil conductors 3x..., as well as a connecting conductor 3y that connects one end 3xs at the attachment port 3o of any coil conductor 3x to the other end 3xt at the attachment port 3o of the adjacent other coil conductor 3x, and is formed by a combination of this coil conductor 3x and connecting conductor 3y.

[0029] As shown in Figures 1 and 3, the coil conductors 3x can be formed by punching a copper or other sheet material into a rectangular conductor Ps with a thickness of 1-2 mm and a width of 3-4 mm. In this case, the overall shape is U-shaped, as shown in Figure 3. Using a rectangular conductor Ps for the coil conductor 3x allows it to be manufactured by punching a copper or other sheet material, thereby facilitating the production of the coil conductor 3x and the connecting conductor 3y, thereby improving productivity and mass production. Furthermore, as shown in Figure 3, the coil conductors 3x can be easily attached (fitted) from above into the recessed grooves 11sc formed in the core case 11 of the core part 2 using automated equipment.

[0030] On the other hand, as shown in FIG. 5, the connecting conductor 3y can connect one end 3xs of the mounting opening 3o of any coil conductor 3x to the other end 3xt of the mounting opening 3o of the other adjacent coil conductor 3x.

[0031] Therefore, the connecting conductor 3y has a basic shape of I-shape, or more specifically, S-shape, compared to the U-shape of the coil conductor 3x. That is, as shown in Fig. 4, when viewed from the bottom, one end 3ys of the connecting conductor 3y is connected to one end 3xs of any of the coil conductors 3x, and the other end 3yt of the connecting conductor 3y is connected to the other end 3xt of the adjacent coil conductor 3x. As a result, the connecting conductor 3y is bent into an S-shape as a whole when viewed from the bottom. The connecting conductor 3y can also be manufactured by punching the same material as the coil conductors 3x, i.e., a 1-2 mm thick copper plate or other sheet material.

[0032] Therefore, the coil device 1 according to this embodiment has a mounting opening 3o that can be attached to the core portion 2, and includes one or more U-shaped coil conductors 3x... that can be sequentially arranged in the circumferential direction Ff of the core portion 2. The coil portion 3 is configured by connecting one end 3xs of any coil conductor 3x at the mounting opening 3o to the other end 3xt of the adjacent coil conductor 3x at the mounting opening 3o with a connecting conductor 3y. This makes it possible to attach the coil conductors 3x... to the outer peripheral surface of the core portion 2 simply by fitting them in one direction, facilitating manufacture, significantly shortening manufacturing time, and improving productivity and production efficiency. In addition, the stress on the core portion 2 during manufacturing can be reduced, making it easy to thin the core case, etc., and to automate the manufacturing process for particularly thick conductors. Furthermore, since the U-shaped coil conductors 3x... are arranged along the outer peripheral surface of the core portion 2, no bulging occurs due to bending when manufacturing the coil portion, which allows for the coil component 1 to be made smaller, minimizes dimensional variations and leakage inductance variations, and reduces dimensional tolerances.

[0033] Next, a method (manufacturing steps) for manufacturing the coil component 1 according to this embodiment will be described according to the flowchart shown in FIG. 8 with reference to FIGS.

[0034] First, a plate material such as a copper plate with a thickness of 1-2 mm is prepared (Step S1). Then, a flat conductor Ps with a rectangular cross section and a width of 3-4 mm, i.e., a U-shaped coil conductor 3x as shown in FIG. 3, is punched out (Step S2). Similarly, a connecting conductor 3y as shown in FIG. 5 is punched out (Step S3). The required number of the above coil conductors 3x... and connecting conductors 3y... are prepared (Step S4).

[0035] Meanwhile, the core unit 2 is produced (step S5). In this case, the core unit 2 includes a core case 11 that covers the core body 2m and has positioning portions 11s... that position the coil conductor 3x on the outer periphery, and therefore can be configured by, for example, accommodating the prepared core body 2m inside the core case 11 that has a container portion and a lid portion.

[0036] Next, the mounting openings 3o of the coil conductors 3x are fitted from above into the positioning portions 11s, i.e., the recessed grooves 11sc, formed on the outer peripheral surface of the core case portion 11 (step S6). Specifically, as shown in Fig. 3, the mounting openings 3o are oriented downward and fitted into the axial direction Fs of the core portion 2. As a result, the coil conductors 3x are assembled while being positioned by the recessed grooves 11sc, and all of the coil conductors 3x are fitted into all of the recessed grooves 11sc (step S7).

[0037] 3 and 5, the connecting conductor 3y is welded to the attachment opening 3o of the coil conductor 3x (step S8). Specifically, as shown in Fig. 5, one end 3ys of the connecting conductor 3y is connected to one end 3xs of any coil conductor 3x, and the other end 3yt of the connecting conductor 3y is connected to the other end 3xt of the other adjacent coil conductor 3x.

[0038] For connection, various welding methods such as laser welding and arc welding can be used. TIG welding is used as the example welding. This welding is performed on all of the connection conductors 3y... and the coil conductors 3x... (step S9). As a result, one coil conductor 3x and one connection conductor 3y are combined to form one turn of winding, and by sequentially forming these one-turn windings, the desired multi-turn coil portion 3 is formed.

[0039] On the other hand, as shown in Figure 7, the bottom of the core portion 2 of the manufactured coil portion 3 is attached to the base portion 30, and then the base portion 30 is attached to the substrate 31, and other necessary parts and components are attached (step S10).

[0040] 7, a heat transfer material 12s such as a silicone sheet is placed on the end surface 3u, which is the upper end surface of the coil portion 3, and an aluminum panel or the like having heat dissipation properties is placed on this heat transfer material 12s to provide a heat dissipation portion 12. In this way, if the coil portion 3 is configured with a heat dissipation portion 12 formed from a heat dissipation material and dissipating heat by contact on the end surface 3u of the coil conductor 3x, no unnecessary bent portions (uneven portions) are created on the end surface of the coil conductor 3x, which makes it easier to implement an efficient heat dissipation design and further improves heat dissipation properties.

[0041] This completes the manufacturing of the coil component 1, and finally, a necessary inspection step is carried out (step S11).

[0042] Therefore, according to the manufacturing method of the coil component 1 of this embodiment, the coil component 1 has an attachment opening 3o for the core portion 2, and is provided with one or more U-shaped coil conductors 3x... that are sequentially attached to the core portion 2 in the circumferential direction Ff, and one end 3xs at the attachment opening 3o of any coil conductor 3x is connected to the other end 3xt at the attachment opening 3o of the adjacent other coil conductor 3x by a connecting conductor 3y, which eliminates the need for bending the coil conductors 3x... during manufacturing, thereby reducing the number of manufacturing steps and contributing to easier and more efficient manufacturing.

[0043] Next, the configuration of the coil component 1 used in the manufacturing method according to the modified example of this embodiment will be described with reference to FIGS.

[0044] In the modified example, when forming the connecting conductor 3y described above, one end of the connecting conductor 3y and one end 3xs of the coil conductor 3x are formed continuously so as to be integral with each other. Therefore, when forming the coil conductor 3x, as shown in Fig. 9, one end 3xs of the coil conductor 3x is formed to extend in the perpendicular direction by a length corresponding to the connecting conductor 3y described above, and an extension portion 3yz whose tip is a tip portion 3es is provided.

[0045] For this reason, the extension portion 3yz is formed into a V-shape, which is an even wider U-shape, as shown by the imaginary line in Figure 9, so that the aforementioned mounting opening 3o can be secured, and the distance between the tip portion 3es and the other end portion 3xt is set wide.

[0046] In this case, the extension portion 3yz is curved in an S shape as shown in Fig. 10. This allows bending one end 3xs side of any coil conductor 3x in the mounting port 3o, so that the tip 3es on the one end 3xs side can be connected (welded) to the other end 3xt in the mounting port 3o of the other adjacent coil conductor 3x.

[0047] Next, the manufacturing method according to the modified example shown in FIGS. 9 and 10 will be described with reference to the flowchart of FIG.

[0048] First, a copper plate or other sheet material is punched into a flat conductor Ps with a rectangular cross section, 1-2 mm thick and 3-4 mm wide, to obtain a U-shaped coil conductor 3x as shown in Fig. 9 (step S21). In this case, the obtained coil conductor 3x is flat, so it is then bent so that the extension portion 3yz has an S shape, as shown in Fig. 10 (step S22). The required number of such coil conductors 3x are prepared (step S23). Next, the core portion 2 is produced (step S24).

[0049] Then, the first coil conductor 3x is attached to the core portion 2. One end 3xs of the attached coil conductor 3x, i.e., the end 3xs on the expanded side of the V-shaped coil conductor 3x shown in FIG. 9, is bent so as to approach the other end 3xt (step S25). As a result, the coil conductor 3x becomes O-shaped as a whole. This state is shown as coil conductor 3xo in FIG. 10.

[0050] After this, the next coil conductor 3x is attached (step S26). At this time, the other end 3xt of the attached coil conductor 3x is fixed by welding to the tip 3es of the already attached coil conductor 3xo, as shown in Fig. 10 (step S27). Next, the coil member 3xse on the one end 3xs side of the welded coil conductor 3x, i.e., the one end 3xs side which is the expanded side of the V-shaped coil conductor 3x shown in Fig. 9, is bent and brought close to the other end 3xt side (step S28).

[0051] As the above assembly of the coil conductors 3x constitutes one turn of winding, the same assembly is performed for all of the coil conductors 3x... (step S29). After this, as shown in Fig. 7 above, the bottom of the core portion 2 is attached to the base portion 30, and further, the base portion 30 is attached to the substrate 31, and other necessary parts and members are attached (step S30). This completes the manufacture of the coil component 1, and finally, a necessary inspection process is performed (step S31).

[0052] Therefore, according to the manufacturing method of the coil component 1 relating to such a modified example of this embodiment, by bending one end 3xs side of the mounting port 3o of any coil conductor 3x, the tip 2es on the one end 3xs side is connected to the other end 3xt of the mounting port 3o of the other adjacent coil conductor 3x.This has the advantage of reducing the number of welding operations for one coil conductor 3x during manufacturing by half, thereby reducing manufacturing labor and contributing to easier and more efficient manufacturing.

[0053] In the manufacturing method according to the modified example, the connecting conductor 3y and the coil conductor 3x are integrally formed, and in particular, the inner coil member 3xse is bent relative to the core portion 2. However, various other portions can be bent as shown in FIGS. 12 and 13. FIG. 12 shows a method in which only the extension portion 3yz is spread, and after installation, only the upper extension portion 3yz is bent. FIG. 13 shows a method in which the outer coil member 3xts is spread relative to the core portion 2, the installation direction is changed to the inward direction during installation, and the coil member 3xts is bent after installation. Furthermore, although not shown, various other methods can be used, such as changing the angle of the coil member 3xse shown in FIG. 9, bending the lower side, or bending two points, the lower side and the outer side.

[0054] The above describes in detail preferred embodiments including modified examples, but the present invention is not limited to such embodiments, and the detailed configuration, shape, material, quantity, numerical values, etc. can be changed, added, or deleted as desired within the scope that does not deviate from the gist of the present invention.

[0055] For example, while it is desirable to use a flat conductor Ps with a rectangular cross section for the coil conductor 3x, this does not exclude coil conductors with other shapes, such as a conductor with a circular cross section overall and a rectangular cross section for some of the connection parts. While the common mode choke coil 1c is used as an example, the invention can be applied to various other coil components, such as normal mode choke coils and transformers, that use coil sections. Furthermore, it is desirable to configure the coil section 3 with a heat dissipation section 12 formed from a heat dissipation material on the end face 3u of the coil conductor 3x, which dissipates heat by contact, but this is not a required component. [Industrial Applicability]

[0056] The coil component according to the present invention can be used as a coil component having various coil portions, such as a common mode choke coil, a transformer, etc., and as a method for manufacturing such coil components. [Explanation of symbols]

[0057] 1: coil component, 2: core, 2m: core body, 3: coil, 3o: attachment port, 3x: coil conductor, 3xs: one end, 3xt: other end, 3y: connecting conductor, 3u: end face of coil conductor, 3es: tip, 12: heat dissipation section

Claims

1. A coil component comprising a cylindrical core portion and a coil portion in which a conductor is wound around the core portion, the coil portion having an attachment port that can be attached to the core portion and one or more U-shaped coil conductors that can be arranged sequentially in the circumferential direction of the core portion, characterized in that the coil portion is formed by connecting one end of any coil conductor at the attachment port to the other end of an adjacent coil conductor at the attachment port with a connecting conductor, or by bending one end of any coil conductor at the attachment port to connect the tip of that one end to the other end of the adjacent coil conductor at the attachment port.

2. 2. The coil component according to claim 1, wherein the core portion includes a core case portion that covers a core body portion and has a positioning portion on an outer periphery thereof that positions the coil conductor.

3. 2. The coil component according to claim 1, wherein the coil conductor is a rectangular conductor having a rectangular cross section.

4. 2. The coil component according to claim 1, wherein the coil portion includes at least one of a common mode choke coil and a normal mode choke coil.

5. 2. The coil component according to claim 1, wherein the coil portion includes a heat dissipation portion that is made of a heat dissipation material and that dissipates heat by contacting an end surface of the coil conductor.

6. A method for manufacturing a coil component having a coil portion in which a conductor is wound around a cylindrical core portion, characterized in that the method has an attachment port that can be attached to the core portion and has one or more U-shaped coil conductors that can be arranged sequentially circumferentially around the core portion, and after the coil conductors are attached to the core portion, one end of any coil conductor at the attachment port is connected to the other end of the attachment port of an adjacent other coil conductor using a connecting conductor to manufacture the coil portion.

7. A method for manufacturing a coil component having a coil portion in which a conductor is wound around a cylindrical core portion, characterized in that the method has an attachment port that can be attached to the core portion and has one or more U-shaped coil conductors that can be arranged sequentially circumferentially of the core portion, and after the coil conductors are attached to the core portion, one end side of the attachment port of any coil conductor is bent and the tip of the one end side is connected to the other end of the attachment port of the adjacent coil conductor to manufacture the coil portion.

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