JP7336855B2 - Coil parts and electronic equipment - Google Patents

Description

The present invention relates to coil components and electronic equipment.

In order to electrically connect the conducting wire forming the winding portion and the terminal electrode formed of the metal plate, it is known to join the end portion of the conducting wire and a part of the metal plate by arc welding or laser welding. (For example, Patent Documents 1 and 2).

JP 2009-158777 A JP 2018-41852 A

When joining a conductive wire and a portion of a metal plate by welding, the molten portion rises to form a rounded welded portion. When a rounded welded portion is formed on the base portion, an external force may be applied to the welded portion in a direction to separate the welded portion from the base portion, and the welded portion may separate from the base portion.

The present invention has been made in view of the above problems, and an object of the present invention is to suppress separation of a welded portion from a base portion.

The present invention comprises a base portion, a winding portion formed of a conductive wire wound around a portion of the base portion, a base portion formed of a metal plate provided on a surface of a portion of the base portion, and the base portion. and a weld portion formed by welding a portion of the metal plate and the conductor wire, and a portion of the weld portion from the base portion to at least a part of the outer periphery of the interface between the weld portion and the base portion. a metal fillet protruding from the surface, and a terminal electrode electrically connected to a lead-out portion in which the lead wire is led out from the winding portion , wherein the maximum diameter portion of the weld portion is the base. The coil component is a coil component in which an end portion of the metal fillet located above the base portion away from the base portion and located on the side opposite to the interface of the metal fillet is located outside of the maximum diameter portion with respect to the weld portion.

In the above configuration, the metal fillet is provided at a portion of the outer circumference of the interface that overlaps at least the lead portion when the surface of the base portion on which the welded portion is provided is viewed in plan. be able to. Further, in the above configuration, the lead-out portion may be separated from the base portion and connected to the weld portion. Further, in the above configuration, the lead-out portion may be configured to be connected to the welded portion while being separated from both the base portion and the metal fillet.

The said structure WHEREIN: The said metal fillet can be set as the structure provided over the perimeter of the outer periphery of the said interface.

The said structure WHEREIN: The said metal fillet can be set as the structure provided in contact with the said maximum diameter part.

In the above structure, the metal fillet may be formed of tin or tin as a main component.

In the above configuration, the lead wire and the welded portion may contain copper, and the lead-out portion may be separated from the metal fillet and connected to the welded portion.

In the above configuration, the terminal electrode may have a locking portion that locks the lead portion.

In the above configuration, the base portion is a core including a winding core portion and a flange portion provided at an end portion in the axial direction of the winding core portion, the terminal electrode is arranged on the flange portion, and the winding portion is the winding portion. A conducting wire may be wound around the winding core portion, and the lead-out portion may be configured such that the conducting wire is led out from the winding core portion to the terminal electrode disposed on the collar portion.

In the above configuration, the base includes a core including a winding core and a flange provided at an end of the winding core in the axial direction, and an exterior core disposed on the outer periphery of the core. The terminal electrode is disposed on the exterior core, the winding portion is formed by winding the conductor wire around the winding core portion, and the lead portion is the terminal in which the conductor wire is disposed from the winding core portion to the exterior core. It can be configured to be pulled out to the electrode.

According to another aspect of the present invention, there is provided an electronic device comprising the coil component described above and a circuit board on which the coil component is mounted.

ADVANTAGE OF THE INVENTION According to this invention, peeling from a base part of a welded part can be suppressed.

FIG. 1(a) is a cross-sectional view of a terminal electrode in a coil component of the present invention, and FIG. 1(b) is a cross-sectional view of a terminal electrode in a coil component of a comparative example. FIG. 2 is a perspective view showing the coil component according to the first embodiment of the present invention. 3(a) is a view of the coil component in FIG. 2 as seen from the arrow F1 side, and FIG. 3(b) is a view as seen from the arrow F2 side. 4(a) and 4(b) are cross-sectional views of the flange portion of the coil component of FIG. 2. FIG. FIG. 5(a) is a cross-sectional view of the terminal electrode between AA in FIG. 3(a), and FIG. 5(b) shows the welded portion and the metal fillet viewed from the arrow F3 side in FIG. 5(a). is a plan view. 6 is a diagram for explaining a terminal metal plate of the coil component of FIG. 2. FIG. 7(a) and 7(b) are diagrams (part 1) for explaining the method of manufacturing the coil component according to the first embodiment of the present invention. FIGS. 8A to 8C are diagrams (part 2) illustrating the method of manufacturing the coil component according to the first embodiment of the present invention. FIG. 9 is a cross-sectional view of terminal electrodes in a coil component according to a second embodiment of the present invention. FIG. 10 is a diagram of a coil component for a single line. FIG. 11 is a perspective view of a coil component in which an outer core is provided on the outer periphery of a drum core. 12A and 12B are diagrams showing an electronic device including the coil component according to the first embodiment of the present invention. FIG.

First, the configuration and effects of the present invention will be described. FIG. 1(a) is a cross-sectional view of a terminal electrode 200 in a coil component of the present invention, and FIG. 1(b) is a cross-sectional view of a terminal electrode 300 in a coil component of a comparative example. A terminal electrode 200 in the coil component of the present invention has a welded portion 201 , a base portion 202 made of a metal plate 203 , and a metal fillet 205 . Welding portion 201 is formed by welding a portion of metal plate 203 and conducting wire 204 and is provided on base portion 202 . Welded portion 201 is joined to base portion 202 by an alloy layer formed between welded portion 201 and base portion 202 . The welded portion 201 is formed by melting a portion of the metal plate 203 and the lead wire 204, so that the melted portion rises and has a rounded shape. A maximum diameter portion 207 of the welded portion 201 is located above the base portion 202 . Therefore, the portion of the welded portion 201 located on the base portion 202 side is recessed from the maximum diameter portion 207 . The metal fillet 205 is provided on at least part of the outer circumference of the interface between the welded portion 201 and the base portion 202 so as to rise from the base portion 202 to the surface of the welded portion 201 .

On the other hand, in the terminal electrode 300 in the coil component of the comparative example, no metal fillet is provided on the outer periphery of the interface between the welded portion 301 and the base portion 302 made up of the metal plate 303 . A maximum diameter portion 307 of the welded portion 301 is located above the base portion 302 , and a portion of the welded portion 301 located on the base portion 302 side is recessed from the maximum diameter portion 307 . A recessed portion 306 is defined as a portion recessed from the maximum diameter portion 307 .

When recessed portion 306 is formed between welded portion 301 and base portion 302 like terminal electrode 300 in the coil component of the comparative example, an external member may enter recessed portion 306 . The external member that has entered the recessed portion 306 applies an external force to the welded portion 301 in the direction of separating it from the base portion 302 , and the welded portion 301 may separate from the base portion 302 . Separation of welded portion 301 from base portion 302 leads to loss of electrical connection between conducting wire 304 and terminal electrode 300 .

On the other hand, in the terminal electrode 200 of the coil component of the present invention, a metal fillet 205 protruding from the base portion 202 to the surface of the welded portion 201 is provided on at least part of the outer periphery of the interface between the welded portion 201 and the base portion 202. . As a result, formation of a recess between welded portion 201 and base portion 202 is suppressed, and external force applied to welded portion 201 in the direction of separating from base portion 202 due to entry of an external member into the recessed portion is suppressed. Therefore, it is possible to suppress separation of the welded portion 201 from the base portion 202 .

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. Components that are common in multiple drawings are given the same reference numerals throughout the multiple drawings. Please note that each drawing is not necessarily drawn to an exact scale for convenience of explanation.

[First embodiment]
2, FIGS. 3(a) and 3(b), FIGS. 4(a) and 4(b), and FIGS. 5(a) and 5(b), the first embodiment of the present invention. A coil component 500 according to the embodiment will be described. FIG. 2 is a perspective view showing a coil component 500 according to the first embodiment of the present invention. Note that the metal fillets 100 and 106 are omitted in FIG. 2 for clarity of illustration. 3A is a view of the coil component 500 viewed from the arrow F1 side of FIG. 2, and FIG. 3B is a view of the coil component 500 viewed from the arrow F2 side of FIG. 3(a) and 3(b) omit illustration of part of the winding portion 30 in order to clearly show the winding core portion 12. As shown in FIG. 4A is a cross-sectional view of the coil component 500 at the flange portion 14, and FIG. 4B is a cross-sectional view of the flange portion 16. As shown in FIG. FIG. 5(a) is a cross-sectional view of the terminal electrode 40 taken along line AA in FIG. 3(a), and FIG. 5(b) shows the welded portion 70 and the metal fillet 100 along arrow F3 in FIG. 5(a). It is the top view seen from the side.

As shown in FIGS. 5(a) and 5(b), the coil component 500 extends from the base portion 80 to the surface of the welded portion 70 at least part of the outer periphery of the interface between the welded portion 70 and the base portion 80. A raised metal fillet 100 is formed. Formation of metal fillet 100 suppresses the application of an external force to welded portion 70 in the direction of separating from base portion 80 , thereby suppressing separation of welded portion 70 from base portion 80 .

Each part constituting the coil component 500 will be described in detail below. Although the coil component 500 is described using a common mode filter as an example, the present invention is not limited to this. 2, 3(a) and 3(b), 4(a) and 4(b), and 5(a) and 5(b), the coil component 500 is a drum core 10, a winding portion 30, and terminal electrodes 40, 42, 44, and 46. The drum core 10 includes a core portion 12, a flange portion 14 provided at one axial end portion of the core portion 12, and a flange portion 16 provided at the other axial end portion of the core portion 12. And prepare. The core part 12 has, for example, a substantially rectangular cross-sectional shape, but it may have a polygonal shape such as a hexagon or an octagon, or may have a circular shape or an elliptical shape. The flanges 14 and 16 are, for example, rectangular parallelepipeds having recesses. The drum core 10 is made of Ni--Zn ferrite material, for example, but may be made of other materials. For example, the drum core 10 may be made of Mn--Zn ferrite material, Fe--Si--Cr, Fe--Si--Al or Fe--Si--Cr--Al or other soft magnetic alloy material, or magnetic material such as Fe or Ni. It may be made of a metallic material, an amorphous magnetic metallic material, or a nanocrystalline magnetic metallic material.

The dimensions of the coil component 500 are, for example, 3.2 mm in length, 2.5 mm in width, and 2.5 mm in height. Here, the length of the coil component 500 is the dimension in the axial direction (the X direction in FIG. 2) of the winding core portion 12 of the drum core 10, and the width is the direction perpendicular to the X direction and parallel to the mounting surface ( 2), and the height is a dimension in a direction orthogonal to the X and Y directions (Z direction in FIG. 2). The dimensions of the drum core 10 are, for example, 3.0 mm in length (dimension in the X direction in FIG. 2), 2.5 mm in width (dimension in the Y direction in FIG. 2), and 2.5 mm in height (dimension in the Z direction in FIG. 2). 1.6 mm. The core portion 12 of the drum core 10 has, for example, a width (the dimension in the Y direction in FIG. 2) of 1.6 mm and a height (the dimension in the Z direction in FIG. 2) of 0.8 mm.

The winding portion 30 comprises two conductors 32 and 34 . The conducting wire 32 is wound around the winding core portion 12 , one end of which is electrically connected to the terminal electrode 40 and the other end of which is electrically connected to the terminal electrode 46 . The conducting wire 34 is wound around the winding core portion 12 , one end of which is electrically connected to the terminal electrode 42 , and the other end of which is electrically connected to the terminal electrode 44 . The conducting wire 32 is wound around the winding core portion 12 on the conducting wire 34 . The conducting wires 32 and 34 have a structure in which a peripheral surface of a core wire 36 made of copper, for example, is covered with an insulating film 38 made of polyamideimide. The core wire 36 may be made of a metal other than copper, such as silver, palladium, or a silver-palladium alloy. The insulating coating 38 may be made of an insulating material other than polyamideimide, and may be made of a resin material such as polyesterimide or polyurethane. The diameter of the conductors 32 and 34 is, for example, 0.05 mm. The conductors 32 and 34 are wound around the winding core 12 the same number of turns.

The collar portion 14 has a lower surface 14A, an upper surface 14B, an end surface 14C, an end surface 14D, a side surface 14E, and a side surface 14F. The collar portion 16 has a lower surface 16A, an upper surface 16B, an end surface 16C, an end surface 16D, a side surface 16E and a side surface 16F. The lower surface 14A and the lower surface 16A are surfaces facing the circuit board when the coil component 500 is mounted on the circuit board. The side surface 14F and the side surface 16F are surfaces to which the winding core 12 is connected.

A concave portion 18 is formed in the end surface 14C of the collar portion 14, and a concave portion 20 is formed in the end surface 14D. The recesses 18 and 20 are formed at positions straddling the vertical centers of the end faces 14C and 14D. The concave portions 18 and 20 are formed, for example, so as to connect from the end surfaces 14C and 14D to the bottom portion via tapered surfaces. The tapered and bottom surfaces of recesses 18 and 20 are considered part of end surfaces 14C and 14D, respectively. The angles of the tapered surfaces of the end surfaces 14C and 14D are appropriately set according to the directions in which the conductors 32 and 34 are drawn out. Similar to the concave portions 18 and 20 formed in the flange portion 14, the flange portion 16 also has a concave portion 22 formed in the end surface 16C and a concave portion 24 formed in the end surface 16D. The thickness of the flanges 14 and 16 is, for example, 0.6 mm. The depth of the recesses 18, 20, 22, 24 is, for example, 0.5 mm, and the width of the bottom portion is, for example, 0.7 mm.

The terminal electrodes 40 and 42 are provided on the collar portion 14 . The terminal electrodes 44 and 46 are provided on the collar portion 16 . The terminal electrode 40 is composed of a terminal metal plate 50 , and the terminal electrode 42 is composed of a terminal metal plate 52 . The terminal electrode 44 is composed of a terminal metal plate 54 , and the terminal electrode 46 is composed of a terminal metal plate 56 . The terminal metal plates 50, 52, 54, and 56 are, for example, Sn-plated phosphor bronze plates, but may be other metals such as Sn-plated brass plates or Sn-plated tough pitch copper plates. may be used.

The terminal metal plate 50 extends from the bottom surface 14A of the collar portion 14 to the top surface 14B via the side surface 14E and is attached to the collar portion 14 by extending into the concave portion 18 provided in the end surface 14C. The terminal metal plate 52 extends from the bottom surface 14A of the collar portion 14 to the top surface 14B via the side surface 14E and is attached to the collar portion 14 by extending into the concave portion 20 provided in the end surface 14D. Similarly, the terminal metal plate 54 extends from the lower surface 16A of the collar portion 16 to the upper surface 16B via the side surface 16E and is attached to the collar portion 16 by extending into the concave portion 24 provided in the end surface 16D. . The terminal metal plate 56 extends from the bottom surface 16A of the collar portion 16 to the top surface 16B via the side surface 16E and is attached to the collar portion 16 by extending into the concave portion 22 provided in the end surface 16C.

FIG. 6 is a diagram for explaining the terminal metal plate 50 of the coil component 500. FIG. Since the terminal metal plates 52, 54, and 56 have the same structure as the terminal metal plate 50, only the terminal metal plate 50 will be described, and the description of the terminal metal plates 52, 54, and 56 will be omitted.

As shown in FIG. 6 , the terminal metal plate 50 includes a metal plate body 60 , a locking claw 62 extending from the metal plate body 60 , and a terminal metal plate 50 extending from the metal plate body 60 while being spaced apart from the locking claw 62 . and a joint claw 64 . The metal plate body 60 is attached to the surface of the flange 14 with one end pressed against the lower surface 14A of the flange 14 and the other end pressed against the upper surface 14B. The locking claw 62 and the joint claw 64 are arranged in the recess 18 provided in the end face 14C. The locking claws 62 are provided to sandwich and lock the conductive wire 32 with the metal plate main body 60 . The joining claws 64 are joined to the conducting wire 32 by welding to electrically connect the conducting wire 32 and the terminal metal plate 50 .

2, 3(a) and 3(b), 4(a) and 4(b), and 5(a) and 5(b), one end of the conductor 32 is The portion and the joining claw 64 of the terminal metal plate 50 are joined by welding. As a result, a rounded dome-shaped welded portion 70 is formed by swelling the melted portion, and the lead-out portion 33A composed of the lead wire 32 drawn out from the winding portion 30 and the terminal electrode 40 are electrically connected at the welded portion 70. It is The other end of the conducting wire 32 and the joining claw 64 of the terminal metal plate 56 are joined by welding. As a result, a rounded dome-shaped welded portion 76 is formed by swelling the melted portion, and the lead-out portion 33B composed of the lead wire 32 drawn out from the winding portion 30 and the terminal electrode 46 are electrically connected at the welded portion 76. It is Similarly, one end of the lead wire 34 and the joining claw 64 of the terminal metal plate 52 are joined by welding to form a rounded dome-shaped welded portion 72 , and the welded portion 72 leads out from the winding portion 30 . The terminal electrode 42 is electrically connected to the terminal electrode 42 and the terminal electrode 42 . The other end of the conducting wire 34 and the joining claw 64 of the terminal metal plate 54 are joined by welding to form a rounded dome-shaped welded portion 74, and the conducting wire is pulled out from the winding portion 30 at this welded portion 74. 34 and the terminal electrode 44 are electrically connected. The welds 70, 72, 74, 76 are formed by laser welding, arc welding, or the like.

A lead-out portion 33A of the lead wire 32 located between the encircling portion 30 and the welded portion 70 is a locking portion 90 formed by bending the locking claw 62 of the terminal metal plate 50 and the metal plate main body 60 of the terminal metal plate 50. It is interposed and locked with the base portion 80 made of. In addition, the lead-out portion 33B of the lead wire 32 located between the winding portion 30 and the welded portion 76 is the locking portion 96 formed by bending the locking claw 62 of the terminal metal plate 56 and the metal plate of the terminal metal plate 56. It is sandwiched between and locked to a base portion 86 formed of the main body 60 .

Similarly, the lead portion 35A of the lead wire 34 located between the winding portion 30 and the welded portion 72 is the locking portion 92 formed by bending the locking claw 62 of the terminal metal plate 52 and the metal of the terminal metal plate 52. It is sandwiched between and locked to a base portion 82 made of the plate body 60 . In addition, the lead-out portion 35B of the lead wire 34 located between the winding portion 30 and the welded portion 74 is the locking portion 94 formed by bending the locking claw 62 of the terminal metal plate 54 and the metal plate of the terminal metal plate 54. It is sandwiched between and locked to a base portion 84 formed of the main body 60 .

Welds 70 , 72 , 74 , 76 are formed on bases 80 , 82 , 84 , 86 . Welds 70, 72, 74, 76 are joined to bases 80, 82, 84, 86 by alloy layers. A metal fillet 100 rising from the base portion 80 to the surface of the welded portion 70 is formed on at least part of the outer periphery of the interface between the welded portion 70 and the base portion 80 . In this embodiment, the metal fillet 100 is formed along the entire circumference of the interface between the welded portion 70 and the base portion 80 , and is formed in contact with and covering the maximum diameter portion 71 of the welded portion 70 . Similarly, a metal fillet 102 raised from the base portions 82, 84, 86 to the surfaces of the weld portions 72, 74, 76 is formed on the entire perimeter of the interface between the weld portions 72, 74, 76 and the base portions 82, 84, 86. , 104, 106 are formed. Metal fillets 102 , 104 , 106 are formed in contact with and over the maximum diameter of welds 72 , 74 , 76 .

[Production method]
Next, a method for manufacturing coil component 500 will be described. First, the drum core 10 is formed. For example, a Ni—Zn ferrite material is mixed with a binder, and the mixed material is compression-molded with a molding die to obtain a drum-shaped compact. If necessary, deburring may be performed on this compact. By sintering this compact at a predetermined firing temperature, the drum core 10 having the winding core 12 and the flanges 14 and 16 is obtained. Next, the terminal metal plates 50 and 52 are attached to the flange portion 14 of the drum core 10 by bending and caulking. Terminal metal plates 54 and 56 are attached to the flange portion 16 of the drum core 10 by bending and caulking. The conducting wire 34 is wound around the outer peripheral surface of the winding core portion 12 of the drum core 10 a required number of times, and the conducting wire 32 is wound around the winding core portion 12 outside the conducting wire 34 a required number of times to form the winding portion 30 . Conductor 32 and conductor 34 are wound the same number of times. The ends of the conductors 32 are pulled out onto the terminal metal plates 50 and 56, and the lead portions 33A, 33B and the terminal metal plates 50, 56 are joined for electrical connection. Similarly, the ends of the conductors 34 are pulled out onto the terminal metal plates 52 and 54, and the lead portions 35A, 35B and the terminal metal plates 52, 54 are joined for electrical connection.

A method of manufacturing the coil component 500 will be described in detail with reference to FIGS. 7(a) to 8(c). FIGS. 7(a) to 8(c) are diagrams for explaining the manufacturing method of the coil component 500. FIG. 7(a) to 8(b) show the vicinity of one end of the lead wire 32 joined to the terminal metal plate 50, and FIG. 8(c) shows the vicinity of the welded portion 70 in FIG. 8(b). Fig. 4 shows a cross-section; In addition, in FIG.8(c), illustration of the drawer part 33A is abbreviate|omitted. 7A to 8C, the vicinity of the terminal metal plate 50 will be illustrated and explained, but since the vicinity of the terminal metal plates 52, 54, and 56 is the same, the explanation will be omitted here.

As shown in FIG. 7(a), a terminal metal plate 50 having a metal plate body 60 and an engaging claw 62 and a joint claw 64 extending from the metal plate body 60 is arranged on the flange portion 14 of the drum core 10 by bending or the like. do. Conductive wires 32 and 34 are wound around the core portion 12 of the drum core 10 to form the winding portion 30 . One end of the lead wire 32 is pulled out onto the metal plate main body 60 of the terminal metal plate 50 using a jig 130 such as a clamp. Next, the insulating coating 38 of the portion of the conductor 32 sandwiched between the metal plate main body 60 and the joining claw 64 is removed to expose the core 36 . The insulating coating 38 can be removed by, for example, laser light irradiation.

As shown in FIG. 7(b), both the locking claws 62 and the joint claws 64 are bent at room temperature, and the lead-out portion 33A composed of the lead wire 32 drawn out from the winding portion 30 is connected to the metal plate main body 60 and the locking claws. It is sandwiched between 62 and joint claws 64 and fixed.

As shown in FIG. 8A, the conductor 32 is cut. A commonly used method can be used for cutting the conducting wire 32 . The conducting wire 32 may be cut by press cutting using, for example, the terminal metal plate 50 and a jig used for bending the locking claws 62 and the joining claws 64 . In this case, the bending of the engaging claws 62 and the joining claws 64 and the cutting of the conductor wire 32 can be performed at once, so that the manufacturing process can be reduced. It is preferable that the conductor 32 is cut on the metal plate main body 60 . By pressing and cutting on the metal plate main body 60, it is possible to suppress damage to the magnetic material or, conversely, breakage of the cutting blade. In addition, since the cutting blade for push-cutting can cut in only one direction, restrictions on the space for arranging it can be reduced. Therefore, the cutting position can be within the outer dimensions of the coil component 500, and it is possible to prevent the leading end of the conductor 32 from deviating from the outer dimensions. For example, this also prevents the leading end of the conductor 32 from interfering with other components.

As shown in FIGS. 8(b) and 8(c), the joining claw 64 and the conducting wire 32 are joined together by welding the joining claw 64 and the conducting wire 32 together. As a result, a welded portion 70 is formed, and the terminal metal plate 50 is electrically connected to the lead portion 33</b>A of the lead wire 32 led out from the winding portion 30 at the welded portion 70 . Laser welding, for example, can be used for welding the joining claw 64 and the lead wire 32, but other welding methods such as arc welding may be used. By irradiating the joining claws 64 with a laser beam to melt the joining claws 64 , the melted portion rises to form a rounded dome-shaped welded portion 70 . Here, when the joint claw 64 is irradiated with a laser beam to weld the joint claw 64 and the conductor wire 32, the Sn plating of the terminal metal plate 50 made of a phosphor bronze plate plated with Sn melts and the phosphor bronze is melted. The power, irradiation position, beam diameter, and the like of the laser light are adjusted so that the temperature does not melt. For example, the welding claw 64 melts at 900° C. or higher, and the metal plate main body 60 melts at about 500° C. so that the Sn plating melts and the phosphor bronze does not melt. Adjust the diameter, etc. As a result, the Sn plating formed on the surface of the phosphor bronze agglomerates on the outer periphery of the interface between the welded portion 70 and the metal plate body 60, and the metal fillet 100 rising from the metal plate body 60 to the surface of the welded portion 70 is formed. It is formed. The welded portion 70 is joined to the metal plate main body 60 made of phosphor bronze through the alloy layer. Therefore, the metal fillet 100 is formed of Sn or Sn as a main component, and the welded portion 70 and the metal plate main body 60 contain copper and are formed of copper as a main component.

In the manufacturing method of the present embodiment, the case of removing the insulating coating 38 of the portion of the conductor 32 corresponding to the joining claw 64 is shown as an example, but depending on the material of the insulating coating 38, the insulating coating 38 may be removed. No process is required.

Thus, in coil component 500 , metal fillet 100 rising from base portion 80 to the surface of welded portion 70 is formed on at least part of the outer periphery of the interface between welded portion 70 and base portion 80 . As a result, as in the case of FIG. 1A , the application of an external force to the welded portion 70 in the direction of pulling away from the base portion 80 is suppressed, and peeling of the welded portion 70 from the base portion 80 can be suppressed.

In addition, since the metal fillet 100 is provided, the contact area between the welded portion 70 and the metal fillet 100 and the base portion 80 is the same as the contact area between the welded portion 70 and the base portion 80 when the metal fillet 100 is not provided. becomes larger than Therefore, the electrical connection between the conducting wire 32 and the terminal electrode 40 is improved, and the DC resistance between the conducting wire 32 and the terminal electrode 40 can be reduced.

The metal fillet 100 preferably overlaps at least the lead-out portion 33A of the outer perimeter of the interface between the welded portion 70 and the base portion 80 when the surface of the base portion 80 on which the welded portion 70 is provided is viewed in plan. provided in This is for the following reasons. In the portion of the welded portion 70 in which the lead portion 33A is built, a force is applied to the welded portion 70 by the lead portion 33A. For example, when the metal fillet 100 is not provided, the welded portion 70 may be separated from the base portion 80 by the force applied to the welded portion 70 by the lead portion 33A. However, since the metal fillet 100 is provided in a portion of the outer periphery of the interface between the welded portion 70 and the base portion 80 that overlaps with the lead portion 33A, even if the force of the lead portion 33A is applied to the welded portion 70, this The force that opposes the force is increased, and separation of the welded portion 70 from the base portion 80 can be suppressed.

In order to suppress separation of the welded portion 70 from the base portion 80 , the metal fillet 100 is preferably provided along the entire circumference of the interface between the welded portion 70 and the base portion 80 .

Metal fillet 100 is preferably provided in contact with maximum diameter portion 71 of weld 70 . As a result, it is possible to suppress the formation of a dent that is deeper than the maximum diameter portion 71 in the portion of the welded portion 70 located on the side of the base portion 80 , and the external member may enter this dent and enter the welded portion 70 from the base portion 80 . Application of an external force in the separating direction is suppressed. Therefore, it is possible to suppress separation of the welded portion 70 from the base portion 80 .

In the coil component 500, the metal fillet 100 is formed mainly of tin or tin, and the conducting wire 32 and the welded portion 70 are formed containing copper. In this case, as shown in FIG. 5(a), the lead portion 33A is preferably separated from the metal fillet 100 and connected to the welded portion 70. As shown in FIG. When the lead portion 33A is joined to the metal fillet 100, it is difficult to join the lead portion 33A to the metal fillet 100 with high strength. is joined to the welded portion 70 with high strength. In order to connect the lead portion 33A to the welded portion 70 away from the metal fillet 100, as shown in FIG.

In the coil component 500 , the terminal electrode 40 includes the locking portion 90 that clamps and locks the lead portion 33</b>A with the base portion 80 . As a result, before and after the welding of the conductor 32 and the joint claw 64 , it is possible to suppress the position of the conductor 32 from moving with respect to the joint claw 64 .

[Second embodiment]
A coil component 600 according to the second embodiment will be described. A coil component 600 according to the second embodiment has the same configuration as the coil component 500 according to the first embodiment except for the terminal electrodes 40 . 2, 3(a), 3(b), 4(a), and 4(b) showing the coil component 500 according to the first embodiment are the second 6 shows a coil component 600 according to an embodiment of FIG. That is, the coil component 500 according to the first embodiment can be applied to each part other than the terminal electrodes 40 that constitute the coil component 600 according to the second embodiment. Also, the method for manufacturing the coil component 600 according to the second embodiment can be applied to the coil component 500 according to the first embodiment.

FIG. 9 is a cross-sectional view of the terminal electrode 40 in the coil component 600 according to the second embodiment of the present invention, and is a cross-sectional view of the terminal electrode 40 taken along line AA in FIG. 3(a). As shown in FIG. 9, in the second embodiment of the present invention, the maximum diameter portion 71 of the welded portion 70 is the boundary with the base portion 80 . That is, no recess is formed between the welded portion 70 and the base portion 80 .

As shown in FIG. 9 , the maximum diameter portion 71 of the welded portion 70 may be the boundary with the base portion 80 . In this case as well, application of an external force to the welded portion 70 in the direction of pulling away from the base portion 80 is suppressed, and peeling of the welded portion 70 from the base portion 80 can be suppressed. In addition, since the maximum diameter portion 71 of the welded portion 70 is located at the boundary with the base portion 80, the radiant heat energy emitted from the melted portion and the welded portion 64 when the joint claw 64 is melted and the welded portion 70 is formed. Scattered light emitted when laser light is applied to the base portion 80 is radiated upward. Therefore, the influence of the radiant heat energy and the scattered light of the laser beam on the base portion 80 and the winding portion 30 can be reduced. In order to suppress the radiant heat energy and the scattered light of the laser beam from being emitted toward the base portion 80 and the winding portion 30, the portion of the base portion 80 to which the welded portion 70 is joined and the surface of the welded portion 70 are separated. The angle θ (see FIG. 9) is preferably smaller than 90°, more preferably 80° or less, and even more preferably 60° or less.

Moreover, since the radiant heat energy and the scattered light of the laser beam are suppressed from being radiated toward the winding portion 30 , the welded portion 70 can be formed near the winding portion 30 . Therefore, the coil component can be miniaturized.

In Embodiments 1 and 2, the case where the coil component is a common mode filter is shown as an example, but other coil components such as a single-line coil component may be used. FIG. 10 is a diagram of a coil component 700 for a single line. As shown in FIG. 10, only the conductor wire 32 is wound around the winding core portion 12 of the drum core 10, and the conductor wire 34 is not wound. The flange portion 14 is provided with only the terminal electrode 40 and is not provided with the terminal electrode 42, and the flange portion 16 is provided with only the terminal electrode 46 and is not provided with the terminal electrode 44. FIG. In addition, although the locking portions 90 and 96 are not provided in FIG. 10, the locking portions 90 and 96 may be provided. FIG. 11 is a perspective view of a coil component 800 in which an outer core is provided around the drum core. In FIG. 11, metal fillets are formed on the outer peripheries of the welded portions 70 and 76, but the illustration of the metal fillets is omitted for clarity, as in the perspective view of FIG. As shown in FIG. 11, an exterior core 110 is provided around the outer circumference of the drum core 10 . Only the conductor wire 32 is wound around the core portion 12 of the drum core 10, and the conductor wire 34 is not wound. Terminal electrodes 40 and 46 are attached to outer core 110 . The lead portions 33A and 33B made of the conductor wire 32 are led out onto the terminal electrodes 40 and 46 arranged on the outer core 110. As shown in FIG.

FIG. 12 is a diagram showing an electronic device 900 including a coil component 500 according to the first embodiment of the present invention. As shown in FIG. 12 , electronic device 900 includes circuit board 120 and coil component 500 mounted on circuit board 120 . The coil component 500 is mounted on the circuit board 120 by connecting the terminal electrodes 40 , 42 , 44 , 46 (only the terminal electrodes 40 and 46 are shown in FIG. 12 ) to the electrodes 122 of the circuit board 120 with solder 124 . ing.

Electronic device 900 has coil component 500 mounted on circuit board 120 . Accordingly, electronic device 900 having coil component 500 in which peeling of welded portions 70, 72, 74, and 76 is suppressed can be obtained. Although the electronic device 900 has the coil component 500 of the first embodiment mounted on the circuit board 120, it may have the coil component 600 of the second embodiment mounted thereon. , coil component 700, coil component 800, etc., other than the coil component 500, various forms of the coil component of the present invention may be mounted.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations can be made within the scope of the gist of the present invention described in the scope of claims. Change is possible.

REFERENCE SIGNS LIST 10 drum core 12 winding core 14, 16 flange 18, 20, 22, 24 recess 30 winding 32, 34 conducting wire 33A, 33B, 35A, 35B drawer 36 core 38 insulating coating 40, 42, 44, 46 terminal electrode 50 , 52, 54, 56 terminal metal plate 60 metal plate main body 62 locking claw 64 joining claw 70, 72, 74, 76 welding portion 71 maximum diameter portion 80, 82, 84, 86 base portion 90, 92, 94, 96 engagement Stopping portion 100, 102, 104, 106 Metal fillet 110 Exterior core 120 Circuit board 122 Electrode 124 Solder 200, 300 Terminal electrode 201, 301 Welding portion 202, 302 Base portion 203, 303 Metal plate 204, 304 Lead wire 205 Metal fillet 306 Recess 207, 307 Maximum diameter 500, 600, 700, 800 Coil component 900 Electronic equipment

Claims (12)

a base portion;
a winding portion formed from a conductive wire wound around a portion of the base;
a base portion made of a metal plate provided on a surface of a portion of the base portion; a weld portion formed on the base portion and formed by welding a portion of the metal plate and the conductor wire; and a metal fillet protruding from the base portion to the surface of the welded portion on at least a part of the outer periphery of the interface between the base portion and the base portion. a terminal electrode connected to
The maximum diameter portion of the welded portion is located above the base portion away from the base portion,
The coil component, wherein an end portion of the metal fillet on the side opposite to the interface is located outside the maximum diameter portion with respect to the welded portion. 2. The coil according to claim 1, wherein the metal fillet is provided in a portion of the outer periphery of the interface that overlaps at least the lead portion when the surface of the base portion on which the welded portion is provided is viewed in plan. parts. 3. The coil component according to claim 2, wherein said lead-out portion is separated from said base portion and connected to said weld portion.. 3. The coil component of claim 2, wherein said lead-out portion connects to said weld portion away from both said base portion and said metal fillet . The coil component according to any one of claims 1 to 4 , wherein the metal fillet is provided over the entire circumference of the outer periphery of the interface. The coil component according to any one of claims 1 to 5 , wherein the metal fillet is provided in contact with the maximum diameter portion. The coil component according to any one of claims 1 to 6 , wherein said metal fillet is formed of tin or tin as a main component. the conductor and the weld are formed of copper,
8. The coil component of claim 7 , wherein said lead-out portion connects to said weld portion away from said metal fillet. 9. The coil component according to claim 1, wherein said terminal electrode has an engaging portion for engaging said lead portion. The base portion is a core including a winding core portion and a flange portion provided at an end portion in the axial direction of the winding core portion,
The terminal electrode is arranged on the collar,
The winding portion is formed by winding the conductor wire around the winding core portion,
10. The coil component according to claim 1, wherein said lead-out portion leads said conductor from said winding core portion to said terminal electrode disposed on said flange portion. The base includes a core including a winding core and a flange provided at an end of the winding core in the axial direction, and an exterior core disposed on the outer periphery of the core,
The terminal electrode is arranged on the outer core,
The winding portion is formed by winding the conductor wire around the winding core portion,
10. The coil component according to claim 1, wherein said lead-out portion leads said conductor wire from said winding core portion to said terminal electrode disposed on said exterior core. a coil component according to any one of claims 1 to 11 ;
and a circuit board on which the coil component is mounted.

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