JP6817509B2 - Inductor parts and their manufacturing methods - Google Patents

Description

The present invention relates to inductor components used in various electronic devices and methods for manufacturing the same.

Conventionally, a configuration in which a coil lead wire of an inductor component and a metal terminal are welded and joined has been used.
It has been proposed that the inductor components be made smaller than when the wire is entwined with the metal terminals.

Such a conventional inductor component will be described with reference to the drawings.

FIG. 13 is a transparent perspective view showing the conventional inductor component 5, and the inside of the block body 6 described later in FIG. 13 is shown by a broken line.

As shown in FIG. 13, in the conventional inductor component, a lead wire 1 having a cross-sectional diameter of 0.6 to 1.5 mm is wound to form a coil 2 having an area of about 13 mm × 13 mm, and an end portion of the lead wire of the coil 2 is formed. An inductor component 5 was formed by connecting a metal terminal 4 for connecting 3 and an external circuit by arc welding.

Then, the coil 2, the end portion 3 of the lead wire of the coil 2, and the welded portion of the metal terminal 4 are embedded inside the block body 6 made of a magnetic material, and the external connection portion of the metal terminal 4 is exposed to the outside of the block body 6. Then, a coil-embedded inductor component in which the coil 2 was embedded in the magnetic material was configured.

As the prior art document information related to the invention of this application, for example, Patent Document 1 is known.

Japanese Unexamined Patent Publication No. 2004-103862

In recent years, the miniaturization of electronic devices has progressed, and the inductor components are also required to be miniaturized. For example, the area of the coil-embedded inductor component is required to be miniaturized, for example, 4 mm × 4 mm. In the inductor component, it is necessary to form a small coil by using a thin wire having a cross-sectional diameter of about 0.1 mm to 0.3 mm of the wire forming the coil.

If the coil is made smaller by using such a thin conductor, the area of the connection portion between the conductor and the metal terminal becomes smaller, and the connection strength between the conductor and the metal terminal tends to become unstable. In particular, the coil In the case of an embedded inductor component, there is a risk that the connection reliability will be reduced because the lead wire of the connection portion will come off due to the stress of molding the magnetic material.

Also, if you try to melt and connect the lead wire and the metal terminal by arc welding etc., the heat when melted is easily transferred to the coil because the coil is small, and there is a risk that the insulating coating of the lead wire will be thermally deteriorated and reliability will be reduced. It will occur.

An object of the present invention is to provide an inductor component and a method for manufacturing the inductor component in which reliability is prevented from being lowered due to miniaturization of the inductor component.

In order to solve the above problems, the present invention comprises a coil portion in which a lead wire is wound, a lead-out portion in which the end portion of the lead wire is pulled out in the outward direction of the coil portion, and a metal plate. It is provided with a terminal electrode having a joint wire portion to which a lead wire portion is connected and an external terminal portion formed integrally with the joint wire portion and connected to an external circuit, and the joint wire portion is extended along the lead wire portion. It has a solid shape, and has a solid-phase diffusion junction in which the lead-out portion and the connecting wire portion are solid-phase diffusion-bonded between the end of the lead-out portion and the coil portion. It is configured to have a melt-joint portion in which the joint wire portion is melt-joined.

Further, the method for manufacturing an inductor component of the present invention includes a step of winding a lead wire to form a coil portion and forming a lead-out portion in which the end portion of the lead wire is pulled out in the outward direction of the coil portion, and a metal plate is punched. This includes a step of forming a terminal electrode having a joint wire portion for connecting the lead wire portion and an external terminal portion integrally connected to the external circuit with the joint wire portion, and a step of connecting the lead wire portion and the joint wire portion. The joint wire portion is formed in a shape extended along the lead-out portion, and the step of connecting the lead-out portion and the joint wire portion is performed between the end of the lead-out portion and the coil portion between the lead-out portion and the joint portion. A solid-phase diffusion junction is formed by solid-phase diffusion bonding of the wire portion by resistance welding, and after the solid-phase diffusion junction is formed, a fusion junction is formed by fusion-bonding the end of the lead-out portion and the joint wire portion by laser welding. It is a manufacturing method to be used.

With the above configuration, the connecting wire portion has a shape extended along the lead-out portion, so that the lead-out portion and the joint wire portion are solid-phase diffusion-bonded between the end of the lead-out portion and the coil portion. A diffusion joint can be provided, and the end of the lead-out can be provided with a melt-joint in which the lead-out and the joint are melt-joined, and the lead-out is joined in two places. By having the portion, it is possible to prevent the lead-out portion from coming off from the joint wire portion while the two connecting portions complement each other.

Further, between the end of the lead-out portion and the coil portion, the lead-out portion and the joint wire portion are solid-phase diffusion-bonded to each other, and the lead-out portion and the joint wire portion are melted at the end of the lead-out portion. Since the structure has a fused melt-bonded portion and the connection portion on the side close to the coil portion is a solid-phase diffusion junction, the solid-phase diffusion junction can reduce the amount of heat at the time of joining as compared with the melt-bonded. Therefore, it is possible to suppress the deterioration of the insulating film of the conducting wire.

Further, in the manufacturing method of the present invention, in the step of connecting the lead-out portion and the joint wire portion, the lead-out portion and the joint wire portion are solid-phase diffusion-welded between the end of the lead-out portion and the coil portion by resistance welding. Since the method is to form a diffusion joint, a solid phase diffusion joint, and then a melt joint in which the end of the lead-out part and the joint wire are melt-welded by laser welding, the solid on the side close to the coil part is formed. Only the contact portion between the lead-out portion and the joint wire portion of the phase diffusion joint can be solid-phase diffuse-welded by heating at a temperature at which resistance welding does not melt and the pressure of the welding electrode, and laser welding of the end portion of the lead-out portion. Since the amount of heat is smaller than that of hot-dip welding, deterioration of the insulating coating of the conducting wire can be suppressed.

Further, after the solid-phase diffusion junction is formed, the end of the lead-out portion and the joint wire portion are melt-bonded by laser welding to form a fusion junction, so that the heat generated by laser welding is generated from the solid-phase diffusion junction. Since heat is dissipated to the terminal electrodes through the joint wire portion, deterioration of the insulating coating of the lead wire can be suppressed.

As described above, the structure of the inductor component and the method for manufacturing the inductor component of the present invention suppress the decrease in connection reliability between the coil lead-out portion and the terminal electrode joint wire portion due to the miniaturization of the inductor component. Further, it is possible to suppress thermal deterioration of the insulating coating of the lead wire when connecting the lead-out portion and the joint wire portion.

A perspective view of the bottom surface of the inductor component according to the embodiment of the present invention. Top side perspective view of the inductor component according to the embodiment of the present invention. Transparent perspective view of the bottom surface side of the inductor component according to the embodiment of the present invention. Transparent perspective view of the upper surface side of the inductor component according to the embodiment of the present invention. The figure explaining the manufacturing process of the inductor component in one Embodiment of this invention. The figure explaining the manufacturing process of the inductor component in one Embodiment of this invention. The figure explaining the manufacturing process of the inductor component in one Embodiment of this invention. The figure explaining the manufacturing process of the inductor component in one Embodiment of this invention. The figure explaining the manufacturing process of the inductor component in one Embodiment of this invention. The figure explaining the manufacturing process of the inductor component in one Embodiment of this invention. The figure explaining the manufacturing process of the inductor component in one Embodiment of this invention. The figure explaining the manufacturing process of the inductor component in one Embodiment of this invention. Transparent perspective view of the upper surface side of a conventional inductor component

Hereinafter, the inductor component according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.

It should be noted that FIGS. 3 and 4 are transparent perspective views that have passed through the molded body 24 described later, and the outline of the molded body 24 is shown by a broken line. Further, in FIGS. 3 and 4, in order to make it easier to understand, the external terminal portion 17 on the front side of the drawing is transparently shown among the pair of external terminal portions 17 described later, and the outline thereof is shown by a chain line. ing.

As shown in FIGS. 1 to 4, in the inductor component 30 of the present embodiment, the coil portion 11 around which the conducting wire 12 with an insulating coating is wound and the insulating coatings at both ends of the conducting wire 12 are removed from the coil portion 11. A connecting wire portion 16 composed of a lead-out portion 13 drawn out in the outward direction and a metal plate 26 to which the lead-out portion 13 is connected, and an external terminal portion 17 formed integrally with the joint wire portion 16 and connected to an external circuit. It is provided with a pair of terminal electrodes 15 having the same.

Then, the coil portion 11, the lead-out portion 13, and the connecting wire portion 16 are embedded in the molded body 24 made of soft magnetic material powder and resin, a part of the external terminal portion 17 is exposed from the molded body, and the inductor component is formed in the magnetic material. It constitutes a coil-embedded inductor component in which 30 is embedded.

Of these, the coil portion 11 is formed by winding a lead wire 12 with an insulating film such as polyamide-imide around the winding core into an oval shape. The shape of the winding core is not limited to the oval shape, and may be a circular shape or a quadrangular shape.

The diameter of the cross section of the lead wire 12 forming the coil portion 11 is as thin as 0.1 mm to 0.3 mm in the case of a small inductor component having a plan view dimension of the molded body 24, for example, 4 mm × 4 mm. It is used to wind and form a coil portion.

When the coil portion 11 is viewed in a plan view, the lead-out portion 13 has both ends of the lead wire 12 of the coil portion 11 pulled out in the outward direction of the coil portion 11, and the insulating coating of the lead wire 12 of the drawn portion is peeled off. It has been removed.

The drawer portion 13 is pulled out from the inside of the outer shape of the coil portion 11 formed in an oval shape in the longitudinal direction in the same direction as the lateral direction of the coil portion 11.

The terminal electrode 15 is made of a metal plate such as phosphor bronze or pure copper having a thickness of 0.1 mm, and is connected to the joint wire portion 16 to which the lead-out portion 13 is connected and the coil portion 11 to be fixed. It has a coil fixing portion 18 and an external terminal portion 17 for connecting to the coil fixing portion 18 and being connected to an external circuit, and the connecting wire portion 16, the coil fixing portion 18, and the external terminal portion 17 are integrally formed. ..

The external terminal portion 17 is appropriately processed according to the form of connecting to an external circuit. In the case of the coil-embedded inductor component shown in FIGS. 1 to 4, the external terminal portion 17 is projected from the side surface of the molded body 24 to be exposed, and is bent from the side surface of the molded body 24 toward the bottom surface for molding. It is arranged in a housing recess 25 for accommodating the external terminal portion 17 formed on the bottom surface of the body 24, and is processed into a surface mount type external terminal portion 17.

The coil fixing portion 18 is formed in a shape that follows a part of the shape of the coil portion 11, and the coil portion 11 is fixed with an adhesive 27 or the like. In the examples shown in FIGS. 3 and 4, the coil portion 11 is formed in an oval shape along the lateral portion of the coil portion 11.

The connecting wire portion 16 is formed in a shape that is connected to the coil fixing portion 18 and extended along the drawing portion 13.

A lead-out portion 13 is superposed on the joint wire portion 16, and the lead-out portion 13 and the joint wire portion 16 are solid-phase diffusion-bonded between the terminal 14 of the lead-out portion 13 and the coil portion 11. It has a diffusion joint portion 19, and the terminal 14 of the lead-out portion 13 has a melt-joint portion 20 in which the lead-out portion 13 and the connecting wire portion 16 are melt-bonded.

By doing so, since the joint wire portion 16 has a shape extended along the lead-out portion 13, the lead-out portion 13 and the joint wire portion are between the terminal 14 of the lead-out portion 13 and the coil portion 11. A solid-phase diffusion bonding portion 19 in which the 16 is solid-phase diffusion-bonded can be provided, and the terminal 14 of the lead-out portion 13 is provided with a melt-bonded portion 20 in which the lead-out portion 13 and the connecting wire portion 16 are melt-bonded. By having a connecting portion in which the lead-out portion 13 is joined in two places to the joint wire portion 16, the connection strength is suppressed by suppressing the lead-out portion 13 from coming off from the joint wire portion 16 while the two connection portions complement each other. Can be improved.

In particular, even as a coil-embedded inductor component in which the coil portion 11 is embedded, the stress caused by embedding the coil portion 11 and the connecting wire portion 16 in a magnetic material made of soft magnetic material powder and resin is two. It is possible to prevent the lead-out portion 13 from coming off from the joint wire portion 16 due to the connection portion joined at the location, and even the miniaturized inductor component 30 can form a coil-embedded inductor component.

Furthermore, between the terminal 14 of the lead-out portion 13 and the coil portion 11, there is a solid-phase diffusion joint portion 19 in which the lead-out portion 13 and the connecting wire portion 16 are solid-phase diffusion-bonded, and the terminal 14 of the lead-out portion 13 has a solid-phase diffusion joint portion 19. Since the lead-out portion 13 and the connecting wire portion 16 are melt-bonded to each other and the connection portion on the side close to the coil portion 11 is the solid-phase diffusion joint portion 19, the solid-phase diffusion joint is melted. Since the amount of heat at the time of joining can be reduced as compared with the joining, deterioration of the insulating coating of the conducting wire 12 can be suppressed even in the miniaturized inductor component 30.

Further, the connecting wire portion 16 integrally has a band-shaped solid-phase diffusion bonding locking piece 21 wound around the drawing portion 13 between the terminal 14 of the drawing portion 13 and the coil portion 11, and the drawing portion 13 has a strip-shaped locking piece 21. It is desirable that the contact portion between the terminal 14 and the connecting wire portion 16 and the contact portion between the lead-out portion 13 and the locking piece 21 for solid-phase diffusion bonding be the solid-phase diffusion bonding portion 19 in which the solid-phase diffusion bonding is performed.

By doing so, the lead-out portion 13 is sandwiched between the joint wire portion 16 and the locking piece 21 for solid-phase diffusion bonding, and the terminal 14 and the joint wire portion 16 of the lead-out portion 13 and the lead-out portion 13 and the solid-phase diffusion bonding are joined. Since the solid-state diffusion joints 19 are formed at the two contact portions of the locking piece 21, the connection reliability between the lead-out portion 13 and the joint wire portion 16 can be further improved.

Furthermore, the joint wire portion 16 integrates a strip-shaped fusion joining locking piece 22 wound around the drawing portion 13 on the terminal 14 side of the drawing portion 13 at a distance from the solid phase diffusion joining locking piece 21. It is desirable to form a melt-joined portion 20 in which the locking piece 22 for melt-joining on the terminal 14 side of the lead-out portion 13 and the terminal 14 and the joint wire portion 16 of the lead-out portion 13 are melt-bonded.

By doing so, as compared with the case where only the terminal 14 of the lead-out portion 13 and the connecting wire portion 16 are melt-bonded, the lock piece 22 for melt-joining on the terminal 14 side of the lead-out portion 13 and the terminal 14 of the drawer portion 13 The molten ball 23 when the joint wire portion 16 is melt-joined becomes larger, and the lead-out portion 13 and the joint wire portion 16 can be joined more reliably.

Here, the fact that the locking piece 21 for solid-phase diffusion bonding and the locking piece 22 for fusion bonding are wound around the drawer portion 13 means that the locking piece 21 for solid-phase diffusion bonding and the locking piece 22 for fusion bonding are drawn out. The surface contact is not limited to the peripheral surface of the portion 13, but the joint wire portion 16 is folded back and covered with the lead-out portion 13 on the side opposite to the joint wire portion 16 along the extending direction of the lead-out portion 13. It suffices that the locking piece 21 for solid-phase diffusion bonding and the locking piece 22 for melt bonding are in surface contact or line contact with the drawing portion 13.

Next, the method of manufacturing the inductor component 30 of the present embodiment described above will be described with reference to FIGS. 5 to 12.

5 to 12 are views for explaining a manufacturing process of a coil-embedded inductor component in which the inductor component 30 is embedded in a magnetic material using the inductor component 30 according to the embodiment of the present invention. In FIGS. 5 to 12, the side of the inductor component 30 which is the bottom surface is shown as the upper side of the drawing.

First, as shown in FIG. 5, a lead wire 12 with an insulating coating is wound to form a coil portion 11, the insulating coatings at both ends of the lead wire 12 are removed, and the lead wire portion 13 is pulled out outward from the coil portion 11. To form. The coil portion 11 is formed in an oval shape, and both drawing portions 13 are pulled out from the inside of the outer shape of the coil portion 11 formed in an oval shape in the longitudinal direction in the same direction as the lateral direction of the coil portion 11.

Next, as shown in FIG. 6, a pair of terminal electrodes 15 are formed by punching the metal plate 26.

The pair of terminal electrodes 15 are connected to an external circuit by connecting to a joint wire portion 16 connecting the lead-out portion 13, a coil fixing portion 18 connecting to the connecting wire portion 16 and fixing the coil portion 11, and a coil fixing portion 18. The external terminal portion 17 for being used is integrally formed.

The connecting wire portion 16 is formed in advance according to the position and dimensions of the drawer portion 13 so as to be along the lead-out portion 13 of the coil portion 11, and the coil fixing portion 18 has a shape that follows a part of the shape of the coil portion 11. To form. In the example shown in FIG. 6, the coil portion 11 is formed in a shape that follows the shape of the lateral portion of the coil portion 11 that is formed in an oval shape. The pair of external terminal portions 17 are formed by extending them in opposite directions.

Further, in the joint wire portion 16, a band-shaped locking piece 21 for solid-phase diffusion bonding is integrally formed between the terminal 14 of the lead-out portion 13 and the coil portion 11 in a direction intersecting the extending direction of the joint wire portion 16. Form. In the example shown in FIG. 6, the solid-phase diffusion bonding locking piece 21 is formed in the direction orthogonal to the extending direction of the connecting wire portion 16.

Further, the joint wire portion 16 extends in a direction intersecting the extension direction of the joint wire portion 16 on the side where the terminal 14 of the lead-out portion 13 is arranged at a distance from the locking piece 21 for solid phase diffusion bonding. The band-shaped locking piece 22 for melt bonding is integrally formed. In the example shown in FIG. 6, the melting joining locking piece 22 is formed in the direction orthogonal to the extending direction of the connecting wire portion 16.

The terminal electrode 15 may be formed of individual pieces, but it is preferable to form the terminal electrode 15 in a hoop material as shown in FIG. 6 because continuous production is possible and productivity can be improved.

Next, as shown in FIGS. 7 and 8, the adhesive 27 is applied to the coil fixing portion 18, the coil portion 11 is arranged on the coil fixing portion 18, and the coil portion 11 is fixed to the coil fixing portion 18.

At this time, the lead-out portion 13 and the joint wire portion 16 are adhesively fixed so as to overlap each other when viewed from above.
Next, as shown in FIG. 9, the solid phase diffusion bonding locking piece 21 and the melt bonding locking piece 22 are processed so as to be wound around the drawer portion 13.

Next, the solid-phase diffusion joining portion in which the locking piece 21, the drawing portion 13, and the connecting wire portion 16 for solid-phase diffusion bonding between the terminal 14 of the drawing portion 13 and the coil portion 11 are solid-phase diffusion bonded by resistance welding. 19 is formed.

The solid-phase diffusion bonding portion 19 sandwiches the locking piece 21, the lead-out portion 13, and the connecting wire portion 16 for solid-phase diffusion bonding from above and below between welding electrodes (not shown) of a resistance welder, and energizes a welding current. Solid-phase diffusion bonding is performed by applying pressure with a welding electrode while generating heat at a temperature at which the contact portion between the locking piece 21 for solid-phase diffusion bonding and the lead-out portion 13 and the contact portion between the lead-out portion 13 and the connecting wire portion 16 do not melt. To form.

By doing so, only the contact portion between the solid-phase diffusion bonding locking piece 21 and the lead-out portion 13 and the contact portion between the lead-out portion 13 and the joint wire portion 16 on the side close to the coil portion 11 are subjected to resistance welding. Solid-phase diffusion bonding can be performed by heating at a temperature that does not melt and pressing of the welding electrode, and the amount of heat is smaller than that of fusion bonding by laser welding. Therefore, deterioration of the insulating coating of the lead wire 12 can be suppressed. it can.

Next, as shown in FIG. 10, after forming the solid-phase diffusion joint portion 19, the joint wire portion 16 including the lock piece 22 for melt joint and the terminal 14 of the lead-out portion 13 are laser-welded to form a molten ball. The molten joint portion 20 which has become 23 is formed.

The melt-joining portion 20 irradiates the terminal 14 of the lead-out portion 13 and the joint wire portion 16 including the hot-dip joining locking piece 22 on the lead-out portion 13 terminal 14 side with laser light from above or below to perform melt-joining. The joint wire portion 16 including the locking piece 22 and the terminal 14 of the lead-out portion 13 are melted and melt-bonded to form.

After forming the solid phase diffusion joint portion 19 in this way, the joint wire portion 1 including the locking piece 22 for melt bonding
Since the melt-bonded portion 20 in which the terminal 14 of the lead-out portion 13 and the lead-out portion 13 is melt-bonded by laser welding is formed, the heat at the time of laser welding is transferred from the already formed solid-phase diffusion joint portion 19 through the joint wire portion 16. Since heat is dissipated to the external terminal portion 17, deterioration of the insulating coating of the lead wire 12 can be suppressed.

In this case, when the solid-phase diffusion bonding portion 19 described with reference to FIG. 9 is resistance-welded, the joint wire portion 16 including the locking piece 22 for fusion welding and the terminal 14 of the lead-out portion 13 are also resistance-welded. Since it is possible to eliminate the gap between the locking piece 22 for melt joining and the lead-out portion 13 and between the lead-out portion and the joint wire portion 16, it is easy to form the melt-joint portion 20 by laser welding. It is preferable because it becomes.

Here, processing the locking piece 21 for solid-phase diffusion bonding and the locking piece 22 for fusion welding described with reference to FIG. 9 so as to be wound around the drawing portion 13 means that the peripheral surface of the drawing portion 13 is surfaced. The locking piece 21 for solid-phase diffusion bonding and the locking piece 22 for fusion welding are folded back from the joint wire portion 16 to the lead-out portion 13 on the opposite side of the joint wire portion 16, without being limited to contacting. It also includes those that are processed so as to cover, and by sandwiching it between welding electrodes during resistance welding, the locking piece 21 for solid-phase diffusion bonding and the locking piece 22 for melt bonding come into surface contact with the lead-out portion 13. It suffices if they are in line contact.

Next, as shown in FIG. 11, except for a part of the external terminal portion 17 of the terminal electrode 15, the coil portion 11, the lead-out portion 13, the connecting portion 16 of the terminal electrode 15, and the soft magnetic material powder and the resin. A magnetic material composed of a mixture is placed in a cavity (not shown) of a molding die and molded to form a molded body 24.

The external terminal portion 17 is molded so as to protrude from the side surface of the molded body 24, and a housing recess 25 for arranging the external terminal portion 17 is formed on the bottom surface of the molded body 24.

As described above, in the present embodiment, as described above, the solid-phase diffusion joint portion 19 is subjected to the stress when the coil portion 11 and the joint wire portion 16 are embedded in the magnetic material composed of the soft magnetic material powder and the resin and formed. Since it is possible to prevent the lead-out portion 13 from coming off from the joint wire portion 16 by the connecting portion joined at two points of the melt-joined portion 20 and the melt-bonded portion 20, even if the inductor component 30 is miniaturized, the coil-embedded inductor is used. Parts can be constructed.

Examples of the molding method for forming the molded body 24 include injection molding, transfer molding, and pressure molding of granulated powder obtained by granulating a mixture of soft magnetic powder and resin into granules.

Next, as shown in FIG. 12, the external terminal portion 17 is cut to a predetermined length, and the external terminal portion 17 is plated with solder or the like, if necessary.

Finally, the external terminal portion 17 is bent from the side surface of the molded body 24 toward the bottom surface, and the external terminal portion 17 is arranged in the accommodating recess 25 formed on the bottom surface of the molded body 24, as shown in FIGS. A coil-embedded inductor component can be obtained.

In the method for manufacturing the inductor component of the present embodiment described above, an example in which the locking piece 21 for solid-phase diffusion bonding and the locking piece 22 for fusion welding are provided has been described, but the locking piece for solid-phase diffusion bonding has been described. 21. The solid-phase diffusion bonding portion 19 may be formed by resistance welding and the fusion bonding portion 20 may be formed by laser welding without providing the locking piece 22 for fusion welding, and the same effect can be obtained.

When the solid-phase diffusion bonding locking piece 21 and the fusion bonding locking piece 22 are provided, in the manufacturing process described with reference to FIG. 9, the solid-phase diffusion bonding locking piece 21 and the fusion bonding locking piece 21 are provided in the drawer portion 13. By winding the piece 22, it is possible to obtain the effect that the drawer portion 13 can be accurately positioned.

The structure of the inductor component and the method for manufacturing the inductor component according to the present invention can suppress a decrease in connection reliability between the coil lead-out portion and the terminal electrode joint wire portion due to the miniaturization of the inductor component. Further, it is possible to suppress thermal deterioration of the insulating coating of the lead wire when connecting the lead-out portion and the joint wire portion, which is industrially useful.

11 Coil part 12 Lead wire 13 Drawer part 14 Terminal 15 Terminal electrode 16 Joint wire part 17 External terminal part 18 Coil fixing part 19 Solid phase diffusion joint part 20 Melting joint part 21 Solid phase diffusion joining locking piece 22 Locking for melt joining Piece 23 Molten ball 24 Molded body 25 Accommodating recess 26 Metal plate 27 Adhesive 30 inductor parts

Claims (8)

A coil portion around which a lead wire is wound, a lead-out portion in which the end portion of the lead wire is pulled out in the outward direction of the coil portion, a metal plate, and a joint wire portion to which the lead-out portion is connected, and the joint wire A terminal electrode having an external terminal portion formed integrally with the portion and connected to an external circuit is provided, and the joint wire portion has a shape extended along the lead-out portion, and the terminal of the lead-out portion and the said The lead-out portion and the joint wire portion are solid-phase diffusion-bonded to each other between the coil portion and the coil portion, and the lead-out portion and the joint wire portion are melt-bonded to the terminal of the lead-out portion. An inductor component characterized by having a molten junction. The joint wire portion integrally has a band-shaped solid phase diffusion bonding locking piece wound around the drawer portion between the terminal of the drawer portion and the coil portion, and the terminal of the drawer portion and the coil portion are described. The inductor component according to claim 1, wherein the solid phase diffusion joint portion is provided at the contact portion of the joint wire portion and the contact portion between the drawer portion and the locking piece for solid phase diffusion bonding. The joint wire portion integrally has a strip-shaped fusion junction locking piece wound around the drawer on the terminal side of the drawer at a distance from the solid phase diffusion bonding locking piece. The inductor component according to claim 2, further comprising the melt-joint portion in which the locking piece for the melt-joint portion on the terminal side of the lead-out portion, the terminal of the drawer portion, and the joint wire portion are melt-bonded. .. Claims 1 to 1, wherein the coil portion, the lead-out portion, and the joint wire portion are embedded in a molded body made of a soft magnetic powder and a resin, and the external terminal portion is exposed from the molded body. The inductor component according to any one of 3. A step of winding a lead wire to form a coil portion and forming a lead-out portion in which the end portion of the lead wire is pulled out in the outward direction of the coil portion, and a joint for connecting the lead-out portion by punching a metal plate. The joint portion comprises a step of forming a terminal electrode having a wire portion and an external terminal portion connected to an external circuit integrally with the joint wire portion, and a step of connecting the lead-out portion and the joint wire portion. , It is formed in a shape extended along the lead-out portion, and the step of connecting the lead-out portion and the joint wire portion is a step of connecting the lead-out portion and the coil portion between the end of the lead-out portion and the coil portion. A solid-phase diffusion joint was formed by solid-phase diffusion bonding of the joints by resistance welding, and after the solid-phase diffusion joint was formed, the end of the lead-out portion and the joint were melt-bonded by laser welding. A method for manufacturing an inductor component that forms a welded joint. In the joint wire portion, a band-shaped solid phase diffusion welding locking piece extending in a direction intersecting the extension direction of the joint wire portion is integrally formed between the end of the lead-out portion and the coil portion. After the locking piece for solid-phase diffusion bonding is wound around the drawer portion, the contact portion between the terminal of the drawer portion and the joint wire portion and the contact portion between the drawer portion and the locking piece for solid-phase diffusion bonding are formed. The method for manufacturing an inductor component according to claim 5, wherein the solid-phase diffusion junction is formed by resistance welding. In the joint wire portion, a strip-shaped fusion welding locking piece extending in a direction intersecting the extending direction of the joint wire portion on the terminal side of the drawer portion at a distance from the solid phase diffusion bonding locking piece. Is integrally formed, and after the melt-joining locking piece is wound around the lead-out portion, the joint wire portion including the melt-joining locking piece and the end of the lead-out portion are laser-welded to perform the melt-joining. The inductor component according to claim 6, wherein a portion is formed. Except for a part of the external terminal portion of the terminal electrode, a magnetic material composed of the coil portion, the lead-out portion, the joint wire portion of the terminal electrode, and a mixture of soft magnetic powder and resin is formed into a molding die. The method for manufacturing an inductor component according to any one of claims 5 to 7, wherein the molded body is formed by arranging and molding in a cavity.

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