JP2018133403A - Inductor component and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a decrease in reliability due to miniaturization of an inductor component.SOLUTION: An inductor component includes: a coil part 11 including a conducting wire 12 wound therein; a lead-out part 13 where an end portion of the conducting wire 12 is led out in an outside direction of the coil part 11; a connecting wire part 16 which consists of a metal plate and to which the lead-out part 13 is connected; and a terminal electrode 15 having an external terminal part 17 which is formed integrally with the connecting wire part 16 and which is connected to the external circuit. The connecting wire part 16 has a shape extended along the lead-out part 13. The connecting wire part includes: a solid phase diffusion joint part 19 where the lead-out part 13 and the connecting wire part 16 are joined by solid-phase diffusion, between the terminal 14 of the lead-out part 13 and the coil part 11; and a melting joint part 20 where the lead-out part 13 and the connecting wire part 16 are joined by melting, at the terminal 14 of the lead-out part 13.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an inductor component used in various electronic devices and a method for manufacturing the same.

Conventionally, using a configuration in which the coil lead wire of the inductor component and the metal terminal are joined by welding,
It has been proposed to reduce the size of the inductor component compared to the case where a conductive wire is wound around a metal terminal.

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

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

  As shown in FIG. 13, the conventional inductor component is formed by winding a conducting wire 1 having a cross-sectional diameter of 0.6 to 1.5 mm to form a coil 2 having an area of about 13 mm × 13 mm. Inductor component 5 is configured by connecting metal terminals 4 for connecting 3 and an external circuit by arc welding.

  And the welding part of the coil 2, the end part 3 of the conducting wire of the coil 2, and the metal terminal 4 is embedded inside the block body 6 made of a magnetic material, and the external connection part of the metal terminal 4 is exposed to the outside of the block body 6. Thus, a coil-embedded inductor component in which the coil 2 is embedded in a magnetic material has been configured.

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

JP 2004-103862 A

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

  When the coil is made smaller using such a thin conducting wire, the area of the connecting portion between the conducting wire and the metal terminal becomes smaller, and the connection strength between the conducting wire and the metal terminal tends to become unstable. In the case of an embedded type inductor component, there is a risk that the connection reliability of the connecting portion of the connecting wire may be lowered due to stress when the magnetic material is formed and then removed.

Also, if the conductor and metal terminal are melted and connected by arc welding or the like, the coil is small, so the heat when melted tends to be transferred to the coil, and the insulation film of the conductor may be thermally deteriorated and the reliability may be reduced. Will arise.

  An object of the present invention is to provide an inductor component and a method for manufacturing the same that prevent a decrease in reliability due to downsizing of the inductor component.

  In order to solve the above-described problems, the present invention includes an inductor component comprising a coil portion around which a conducting wire is wound, a lead portion in which an end portion of the conducting wire is drawn outwardly of the coil portion, and a metal plate Comprising a terminal electrode having a connecting portion to which a lead portion is connected and an external terminal portion formed integrally with the connecting portion and connected to an external circuit, and the connecting portion is extended along the lead portion. And has a solid phase diffusion bonding portion in which the drawing portion and the connecting portion are solid phase diffusion bonded between the terminal of the drawing portion and the coil portion. The connecting portion has a melt-bonded portion that is melt-bonded.

  The inductor component manufacturing method according to the present invention includes a step of forming a coil portion by winding a conducting wire, forming a lead-out portion in which an end portion of the conducting wire is drawn outwardly of the coil portion, and punching a metal plate A step of forming a connecting portion connecting the lead portion, a terminal electrode having an external terminal portion connected to the external circuit integrally with the connecting portion, and a step of connecting the lead portion and the connecting portion. The connecting portion is formed in a shape extending along the leading portion, and the step of connecting the leading portion and the connecting portion is performed between the leading portion of the leading portion and the coil portion. After forming the solid phase diffusion joint by solid phase diffusion bonding of the wire part by resistance welding and forming the solid phase diffusion joint part, the fusion joint part is formed by melt welding the end of the lead part and the connecting part by laser welding Is a manufacturing method .

  With the above configuration, since the connecting portion has a shape extending along the drawing portion, a solid phase in which the drawing portion and the connecting portion are solid phase diffusion bonded between the terminal of the drawing portion and the coil portion. Diffusion bonding can be provided, and the end of the lead-out part can be provided with a melt-bonded part where the lead-out part and the connecting part are melt-bonded, and the connection where the lead-out part is joined to the connecting part at two locations By having the portion, it is possible to prevent the drawing portion from being detached from the connecting portion while the two connecting portions supplement each other.

  In addition, there is a solid phase diffusion bonding part in which the lead part and the connecting part are solid phase diffusion bonded between the terminal of the lead part and the coil part, and the lead part and the connecting part are melted at the terminal of the lead part. Since the connection part close to the coil part is a solid phase diffusion bonding part with a structure having a bonded fusion bonding part, solid phase diffusion bonding can reduce the amount of heat at the time of bonding compared to fusion bonding. 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, the step of connecting the lead portion and the connecting portion is performed by solid phase diffusion bonding of the lead portion and the connecting portion by resistance welding between the terminal of the lead portion and the coil portion. After forming the diffusion bonding part and forming the solid phase diffusion bonding part, the fusion bonding part is formed by melting and welding the end of the lead part and the connecting part by laser welding. Only the contact part between the lead part and the connecting part of the phase diffusion joint part can be solid phase diffusion joined by heating at a temperature at which the resistance welding does not melt and the pressure of the welding electrode, and laser welding of the terminal part of the lead part Therefore, since the amount of heat is smaller than that of the fusion bonding by, deterioration of the insulating film of the conductor can be suppressed.

Furthermore, after forming the solid phase diffusion bonding part, the fusion bonding part is formed by melting and welding the end of the lead part and the connecting part by laser welding. Since heat is radiated to the terminal electrode through the connecting portion, the deterioration of the insulating film of the conductive wire can be further suppressed.

  As described above, the configuration of the inductor component and the manufacturing method thereof according to the present invention suppress the deterioration of the connection reliability between the lead portion of the coil and the connecting portion of the terminal electrode due to the downsizing of the inductor component. Further, it is possible to suppress thermal deterioration of the insulating film of the conductive wire when connecting the lead portion and the connecting portion.

The perspective view of the bottom face side of the inductor component in one embodiment of this invention The perspective view of the upper surface side of the inductor component in one embodiment of this invention FIG. 6 is a transparent perspective view of the bottom surface side of the inductor component according to the embodiment of the present invention. FIG. 6 is a 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 components in one embodiment of this invention The figure explaining the manufacturing process of the inductor components in one embodiment of this invention The figure explaining the manufacturing process of the inductor components in one embodiment of this invention The figure explaining the manufacturing process of the inductor components in one embodiment of this invention The figure explaining the manufacturing process of the inductor components in one embodiment of this invention The figure explaining the manufacturing process of the inductor components in one embodiment of this invention The figure explaining the manufacturing process of the inductor components in one embodiment of this invention The figure explaining the manufacturing process of the inductor components in one embodiment of this invention Transparent perspective view of the top side of a conventional inductor component

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

  3 and 4 are transmission perspective views that pass through a molded body 24 described later, and the outline of the molded body 24 is indicated by a broken line. Further, in order to facilitate understanding in FIGS. 3 and 4, among the pair of external terminal portions 17 to be described later, the external terminal portion 17 on the front side of the drawing is shown transparently, and the outline thereof is indicated by a one-dot chain line. ing.

  As shown in FIG. 1 to FIG. 4, the inductor component 30 according to the present embodiment includes a coil portion 11 around which a conductive wire 12 with an insulating coating is wound, and an insulating coating on both ends of the conductive wire 12 is removed. A lead portion 13 that is drawn outward, a metal plate 26, a connecting portion 16 to which the lead portion 13 is connected, and an external terminal portion 17 that is formed integrally with the connecting portion 16 and connected to an external circuit. A pair of terminal electrodes 15 are provided.

  The coil portion 11, the lead portion 13, and the connecting portion 16 are embedded in a molded body 24 made of soft magnetic powder and resin, and a part of the external terminal portion 17 is exposed from the molded body. The coil-embedded inductor component 30 is embedded.

  Among these, the coil part 11 is formed by winding a conducting wire 12 with an insulating coating such as polyamideimide and winding the core into an oval shape. The shape of the winding core is not limited to an oval shape, and may be a circular shape or a rectangular shape.

  The diameter dimension of the cross section of the conducting wire 12 forming the coil portion 11 is a thin conducting wire of about 0.1 mm to 0.3 mm in the case of a small inductor component in which the size of the molded body 24 is 4 mm × 4 mm. The coil part is wound and formed.

The lead portion 13 is obtained by drawing both end portions of the conducting wire 12 of the coil portion 11 outward from the coil portion 11 when the coil portion 11 is viewed in plan, and the insulating coating of the lead portion 12 of the lead portion is peeled off. Has been removed.

  And the drawer | drawing-out part 13 is pulled out in the same direction as the transversal direction of the coil part 11 from the inner side rather than the external shape of the longitudinal direction of the coil part 11 formed in the ellipse shape.

  The terminal electrode 15 is made of a metal plate such as phosphor bronze or pure copper with a thickness of 0.1 mm. The terminal portion 15 is connected to the connecting portion 16 to which the lead portion 13 is connected, and is connected to the connecting portion 16 to fix the coil portion 11. The coil fixing part 18 has an external terminal part 17 connected to the coil fixing part 18 and connected to an external circuit. The connecting line part 16, the coil fixing part 18 and the external terminal part 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 type inductor component shown in FIGS. 1 to 4, the external terminal portion 17 is exposed by protruding from the side surface of the molded body 24, bent from the side surface of the molded body 24 toward the bottom surface, and molded. The external terminal portion 17 formed on the bottom surface of the body 24 is accommodated in the housing recess 25 and is processed into a surface-mount type external terminal portion 17.

  The coil fixing portion 18 is formed in a shape along 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 example shown in FIGS. 3 and 4, the coil portion 11 formed in an oval shape is formed in a shape along the short direction portion.

  The connecting portion 16 is connected to the coil fixing portion 18 and formed in a shape extending along the lead portion 13.

  The lead portion 13 is overlaid on the connecting portion 16, and the lead portion 13 and the connecting portion 16 are solid phase diffusion bonded between the terminal 14 of the lead portion 13 and the coil portion 11. A diffusion bonding portion 19 is provided, and a terminal 14 of the drawing portion 13 has a fusion bonding portion 20 in which the drawing portion 13 and the connecting portion 16 are fusion bonded.

  By doing in this way, since the connection part 16 is the shape extended | stretched along the drawer | drawing-out part 13, between the terminal 14 and the coil part 11 of the drawer | drawing-out part 13, the drawer | drawing-out part 13 and a connection part 16 can be provided with a solid phase diffusion bonding portion 19 in which solid phase diffusion bonding is performed, and a melt bonding portion 20 in which the drawing portion 13 and the connecting portion 16 are melt bonded to each other at the terminal 14 of the drawing portion 13 is provided. By connecting the connecting portion 16 to the connecting portion 16 and connecting the two leading portions 13 to each other, the connecting portions at the two locations supplement each other, and the connecting portion 16 is prevented from coming off from the connecting portion 16. Can be improved.

  In particular, the coil-embedded inductor component in which the coil portion 11 is buried is also resistant to stress when the coil portion 11 and the connecting portion 16 are embedded in a magnetic material made of soft magnetic powder and resin. It is possible to suppress the pull-out portion 13 from being disconnected from the connecting portion 16 by the connection portion joined at the location, and even a downsized inductor component 30 can constitute a coil-embedded inductor component.

  Furthermore, between the terminal 14 of the lead-out part 13 and the coil part 11, there is a solid-phase diffusion bonding part 19 in which the lead-out part 13 and the connecting part 16 are solid-phase diffusion bonded. Since the connecting portion on the side close to the coil portion 11 is the solid phase diffusion bonding portion 19, the solid phase diffusion bonding is melted. Since the amount of heat at the time of bonding can be reduced as compared with bonding, deterioration of the insulating film of the conductive wire 12 can be suppressed even with the downsized inductor component 30.

  In addition, the connecting portion 16 integrally includes a strip-shaped solid phase diffusion bonding locking piece 21 wound around the lead portion 13 between the terminal 14 of the lead portion 13 and the coil portion 11. It is desirable that the contact portion between the terminal 14 and the connecting portion 16 and the contact portion between the lead-out portion 13 and the locking piece 21 for solid phase diffusion bonding be a solid phase diffusion bonding portion 19 that is solid phase diffusion bonded.

  By doing in this way, the drawer | drawing-out part 13 is inserted | pinched between the connection part 16 and the locking piece 21 for solid phase diffusion bonding, and the terminal 14 of the drawer | drawing-out part 13, the connection part 16, and the drawer | drawing-out part 13 and solid-phase diffusion bonding Since the two solid-phase diffusion bonding portions 19 at the contact portion of the locking piece 21 are formed, the connection reliability between the lead portion 13 and the connecting portion 16 can be further improved.

  Furthermore, the connecting portion 16 is integrated with a solid-phase diffusion bonding locking piece 21 at a distance from the terminal 14 side of the drawing portion 13 and a belt-like fusion bonding locking piece 22 wound around the drawing portion 13. It is preferable that the melt-bonding portion 20 is formed by fusion-bonding the fusion-joining locking piece 22 on the terminal 14 side of the lead-out portion 13 with the terminal 14 and the connecting portion 16 of the lead-out portion 13.

  By doing in this way, compared with the case where only the terminal 14 of the lead-out portion 13 and the connecting portion 16 are melt-bonded, the fusion-joining locking piece 22 on the terminal 14 side of the lead-out portion 13 and the terminal 14 of the lead-out portion 13 are used. Further, the molten ball 23 when the connecting portion 16 is melt-bonded is increased, and the lead-out portion 13 and the connecting portion 16 can be more reliably bonded.

  Here, the solid-phase diffusion bonding locking piece 21 and the melt-bonding locking piece 22 are wound around the drawer portion 13 when the solid-phase diffusion bonding locking piece 21 and the melt-bonding locking piece 22 are pulled out. It is not limited to the surface contact with the peripheral surface of the portion 13, but is folded back from the connecting portion 16 and covers the drawing portion 13 opposite to the connecting portion 16 along the extending direction of the drawing portion 13. It is sufficient that the solid phase diffusion bonding locking piece 21 and the fusion bonding locking piece 22 are in surface contact or line contact with the drawer portion 13.

  Next, a method for manufacturing the inductor component 30 according to the present embodiment will be described with reference to FIGS.

  5 to 12 are diagrams illustrating a manufacturing process of a coil-embedded inductor component in which the inductor component 30 according to the embodiment of the present invention is used and the inductor component 30 is embedded in a magnetic material. 5-12, the side used as the bottom face of the inductor component 30 is shown as the upper side of drawing.

  First, as shown in FIG. 5, a coil portion 11 is formed by winding a conducting wire 12 with an insulating coating, and the leading portion 13 is drawn out outwardly from the coil portion 11 by removing the insulating coating on both ends of the conducting wire 12. Form. The coil portion 11 is formed in an oval shape, and the two lead-out portions 13 are pulled out in the same direction as the short direction of the coil portion 11 from the inner side of the outer shape in the longitudinal direction of the coil portion 11 formed in an oval shape.

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

  The pair of terminal electrodes 15 are respectively connected to the connecting portion 16 connecting the lead-out portion 13, the coil fixing portion 18 connected to the connecting portion 16 and fixing the coil portion 11, and connected to the coil fixing portion 18 and connected to an external circuit. The external terminal portion 17 to be formed is integrally formed.

The connecting portion 16 is formed in advance according to the position and dimensions of the drawing portion 13 so as to follow the drawing portion 13 of the coil portion 11, and the coil fixing portion 18 is shaped along a part of the shape of the coil portion 11. To form. In the example shown in FIG. 6, it forms in the shape along the shape of the transversal direction part of the coil part 11 formed in the ellipse shape. The pair of external terminal portions 17 are formed by extending in opposite directions.

  Also, the connecting portion 16 is integrally provided with a band-like solid phase diffusion bonding locking piece 21 between the terminal 14 of the lead-out portion 13 and the coil portion 11 in a direction crossing the extending direction of the connecting portion 16. Form. In the example shown in FIG. 6, the solid phase diffusion bonding locking piece 21 is formed in a direction orthogonal to the extending direction of the connecting portion 16.

  Further, the connecting portion 16 is spaced apart from the solid-phase diffusion bonding locking piece 21 and extends in a direction intersecting the extending direction of the connecting portion 16 on the side where the terminal 14 of the lead-out portion 13 is disposed. A belt-like fusion joining locking piece 22 is integrally formed. In the example shown in FIG. 6, the fusion joining locking piece 22 is formed in a direction orthogonal to the extending direction of the connecting portion 16.

  The terminal electrode 15 may be formed as an individual piece. However, it is preferable to form the terminal electrode 15 on 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 disposed on the coil fixing portion 18, and the coil portion 11 is fixed to the coil fixing portion 18.

At this time, the drawer portion 13 and the connecting portion 16 are bonded and fixed so as to overlap in a top view.
Next, as shown in FIG. 9, the solid-phase diffusion bonding locking piece 21 and the fusion bonding locking piece 22 are processed so as to be wound around the drawer portion 13.

  Next, the solid phase diffusion bonding portion in which the solid phase diffusion bonding locking piece 21, the drawing portion 13, and the connecting portion 16 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 energizes a welding current by sandwiching the solid phase diffusion bonding locking piece 21, the lead portion 13, and the connecting portion 16 with a welding electrode (not shown) of a resistance welding machine from above and below. Solid-phase diffusion bonding is performed by applying pressure with the welding electrode while heating 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 connecting portion 16 to a temperature that does not melt. Form.

  In this way, only the contact portion between the solid-phase diffusion bonding locking piece 21 and the lead portion 13 and the contact portion between the lead portion 13 and the connecting portion 16 on the side close to the coil portion 11 is subjected to resistance welding. Solid phase diffusion bonding can be performed by heating at a temperature that does not melt and welding electrode pressure, and the amount of heat is smaller than that of fusion bonding by laser welding. it can.

  Next, as shown in FIG. 10, after forming the solid phase diffusion bonding portion 19, the welded portion 16 including the fusion bonding locking piece 22 and the terminal 14 of the lead-out portion 13 are laser-welded, whereby the molten ball 23 is formed.

  The fusion bonded portion 20 is used for fusion bonding by irradiating the connecting portion 16 including the terminal 14 of the lead-out portion 13 and the fusion-bonding locking piece 22 on the lead-out portion 13 terminal 14 side from above or below. The connecting portion 16 including the locking piece 22 and the terminal 14 of the lead-out portion 13 are melted and melt bonded.

After forming the solid phase diffusion bonding portion 19 in this way, the connecting portion 1 including the fusion bonding locking piece 22 is formed.
6 and the end 14 of the lead-out part 13 are formed by fusion welding by laser welding, so that heat when laser welding is conducted from the solid phase diffusion joining part 19 already formed through the connecting part 16 Since the heat is radiated to the external terminal portion 17, it is possible to further suppress the deterioration of the insulating coating of the conductive wire 12.

  In this case, when resistance welding is performed on the solid phase diffusion bonding portion 19 described in FIG. 9, if the joint portion 16 including the fusion bonding locking piece 22 and the terminal 14 of the lead-out portion 13 are also subjected to resistance welding. In addition, since it is possible to eliminate the gap between the fusion joining locking piece 22 and the lead portion 13 and between the lead portion and the connecting portion 16, it is easy to form the melt joint portion 20 by laser welding. This is preferable.

  Here, processing the solid-phase diffusion bonding locking piece 21 and the melt bonding locking piece 22 described with reference to FIG. The locking piece 21 for solid phase diffusion bonding and the locking piece 22 for fusion bonding are folded back from the connecting portion 16 to the lead portion 13 opposite to the connecting portion 16. It includes those that are processed so as to cover them, and by sandwiching them with welding electrodes when resistance welding is performed, the solid-phase diffusion bonding locking pieces 21 and the fusion bonding locking pieces 22 are brought into contact with the drawer portion 13 by surface contact or It only has to be 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 portion 13, the connecting portion 16 of the terminal electrode 15, and the soft magnetic powder and the resin A magnetic material made 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 an accommodation recess 25 in which the external terminal portion 17 is disposed 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 bonding portion 19 against the stress generated by embedding the coil portion 11 and the connecting portion 16 in a magnetic material made of soft magnetic powder and resin. And the melt-bonded portion 20 are joined at two locations, so that the lead-out portion 13 can be prevented from coming off from the connecting portion 16, so that even a downsized inductor component 30 is a coil-embedded inductor. Parts can be configured.

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

  Next, as shown in FIG. 12, the external terminal part 17 is cut | disconnected by predetermined length, and plating, such as a solder, is given to the external terminal part 17 as needed.

  Finally, the external terminal portion 17 is bent from the side surface to the bottom surface of the molded body 24, and the external terminal portion 17 is disposed in the housing 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 above-described method for manufacturing an inductor component according to the present embodiment, the example in which the solid-phase diffusion bonding locking piece 21 and the fusion bonding locking piece 22 are provided has been described. 21, without providing the fusion bonding locking piece 22, 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, and similar effects can be obtained.

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

  The configuration of the inductor component according to the present invention and the manufacturing method thereof can suppress a decrease in connection reliability between the lead portion of the coil and the connection portion of the terminal electrode due to downsizing of the inductor component, Furthermore, the thermal deterioration of the insulating film of the conducting wire when connecting the lead portion and the connecting portion can be suppressed, which is industrially useful.

DESCRIPTION OF SYMBOLS 11 Coil part 12 Conductor 13 Lead | draw-out part 14 Terminal 15 Terminal electrode 16 Connection part 17 External terminal part 18 Coil fixing part 19 Solid phase diffusion bonding part 20 Melt bonding part 21 Locking piece for solid phase diffusion bonding 22 Locking for fusion bonding Piece 23 Molten ball 24 Molded body 25 Containing recess 26 Metal plate 27 Adhesive 30 Inductor part

Claims (8)

A coil portion wound with a conducting wire; an end portion of the conducting wire drawn out outward of the coil portion; a connecting portion made of a metal plate and connected to the leading portion; and the connecting wire Terminal electrode having an external terminal portion formed integrally with a portion and connected to an external circuit, wherein the connecting portion has a shape extending along the lead portion, and the terminal of the lead portion and the terminal Between the coil portion, there is a solid phase diffusion bonded portion in which the lead portion and the connecting portion are solid phase diffusion bonded, and the lead portion and the connecting portion are melt bonded to the end of the pulling portion. An inductor component characterized by having a melt-bonded portion. The connecting portion integrally includes a strip-shaped solid phase diffusion bonding locking piece wound around the leading portion between the leading end of the leading portion and the coil portion. The inductor component according to claim 1, wherein the solid-phase diffusion bonding portion is provided at a contact portion of the connecting portion and a contact portion of the lead-out portion and the locking piece for solid-phase diffusion bonding. The connecting portion is integrally provided with a strip-shaped fusion bonding portion locking piece wound around the drawing portion on the terminal side of the drawing portion with a space from the locking piece for solid phase diffusion bonding, 3. The inductor component according to claim 2, wherein the fusion-bonding portion locking piece on the terminal side of the lead-out portion, the terminal of the lead-out portion and the connecting portion have the melt-joint portion. . The coil portion, the lead portion, and the connecting portion are embedded in a molded body made of soft magnetic powder and resin, and the external terminal portion is exposed from the molded body. 4. The inductor component according to any one of 3. A step of forming a coil portion by winding a conductive wire, forming a lead portion in which an end portion of the conductive wire is drawn out outward of the coil portion, and a joint for connecting the lead portion by punching a metal plate A step of forming a terminal electrode having a wire portion and an external terminal portion connected to an external circuit integrally with the wire portion, and a step of connecting the lead portion and the wire portion, wherein the wire portion is Forming the shape extending along the lead-out portion, and connecting the lead-out portion and the connecting portion between the lead-out portion and the coil portion, After forming the solid phase diffusion bonding portion obtained by solid phase diffusion bonding of the connecting portion by resistance welding and forming the solid phase diffusion bonding portion, the end of the lead portion and the connecting portion are melt bonded by laser welding. Form a melt joint Manufacturing method of the inductor component is intended. In the connecting portion, a band-shaped solid phase diffusion bonding locking piece extending in a direction intersecting the extending direction of the connecting portion is formed integrally between the terminal of the lead portion and the coil portion, After winding the solid-phase diffusion bonding locking piece around the lead-out portion, the contact portion between the terminal of the lead-out portion and the connecting portion and the contact portion between the lead-out portion and the locking piece for solid-phase diffusion bonding 6. The method of manufacturing an inductor component according to claim 5, wherein the solid phase diffusion bonding portion is formed by resistance welding. The connecting portion has a strip-shaped fusion bonding locking piece extending in a direction intersecting with the extending direction of the connecting portion on the terminal side of the drawing portion with a space from the locking piece for solid phase diffusion bonding. Are integrally formed, and after the fusion bonding locking piece is wound around the drawing portion, the connecting portion including the fusion bonding locking piece and the terminal of the drawing portion are laser welded to perform the fusion bonding. 7. The inductor component according to claim 6, wherein a part is formed. Except for a part of the external terminal part of the terminal electrode, the coil part, the lead part, the connecting part of the terminal electrode, and a magnetic material comprising a mixture of soft magnetic powder and resin The method for manufacturing an inductor component according to claim 5, wherein the molded product is formed by being disposed in a cavity.

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