JP2020123707A - Coil component, electronic equipment, and method of manufacturing coil component - Google Patents

Abstract

To allow confirmation of whether a lead wire is bonded with a sufficient length.SOLUTION: A coil component comprises: a base part; a circulation part formed from a lead wire wound around a part of the base part; a terminal electrode formed on a surface of a part of the base part and formed from a metal plate, and connected with the lead wire drawn from the circulation part; and a bonding part bonded with an end part of the lead wire and a part of the metal plate, and that electrically connects between the lead wire and the terminal electrode. A front end surface that is a cross-section surface at a front end, of the lead wire is exposed from the bonding part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coil component, an electronic device, and a method for manufacturing a coil component.

A coil component is known in which an end portion of a conductive wire and a part of a metal plate are joined in order to electrically connect a conductive wire forming a winding portion and a terminal electrode made of a metal plate (for example, Patent Document 1). To 3).

JP, 2008-10752, A JP, 2018-41852, A JP, 2018-56399, A

In the coil components described in Patent Documents 1 to 3, it is not possible to confirm whether the conductor wire is joined to the joint where the conductor wire and the metal plate are joined with a sufficient length. If the conductors are not joined in a sufficient length, the reliability of the electrical connection and mechanical connection between the conductors and the terminal electrodes will be reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to confirm whether or not a conductive wire is joined with a sufficient length.

According to the present invention, a base portion, a winding portion formed of a conductive wire wound around a portion of the base portion, a metal plate formed on a surface of a portion of the base portion, and drawn out from the winding portion. A terminal electrode that is connected to a conductor wire; and an end portion of the conductor wire and a part of the metal plate that are joined together, and a joint portion that electrically connects the conductor wire and the terminal electrode, and a tip of the conductor wire. A front end surface, which is a cross section of the coil component, is a coil component exposed from the joint.

In the above structure, the leading end of the conductive wire may protrude from the joint.

In the above configuration, the leading end portion of the conductive wire may be configured to protrude from the joint portion within a range overlapping the base portion when the surface of the base portion provided with the joint portion is viewed in a plan view. You can

In the above configuration, the tip end surface of the conductive wire may be flush with the surface of the welded portion.

In the above structure, the terminal electrode may have a locking portion that locks the conductive wire.

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 disposed in the flange portion, and the conductive wire is the winding wire. The winding portion may be wound around a core portion to form the winding portion, and the winding portion may be drawn out to the terminal electrode arranged in the collar portion, and the joint portion may be formed on the collar portion. it can.

The present invention is an electronic device including the coil component described above and a circuit board on which the coil component is mounted.

According to the present invention, a step of disposing a terminal metal plate having a metal plate body and a joining claw extending from the metal plate body on a base portion, and a step of winding a conducting wire around a part of the base portion to form a winding portion. , With the state in which the tip of the conductor wire is located outside the joint claw, the conductor wire and the joint claw are joined to form a joint portion that electrically connects the conductor wire and the terminal metal plate. And a step of manufacturing a coil component.

In the above configuration, after the step of forming the joint portion, a step of cutting a part or all of the tip portion of the conductive wire protruding from the joint portion may be provided.

In the above configuration, a step of locking the conductive wire with a locking claw of the terminal metal plate may be provided so that a tip portion of the conductive wire is positioned outside the joining claw. ..

According to the present invention, it is possible to confirm whether or not the conductor wires are joined with a sufficient length.

FIG. 1 is a diagram showing a coil component according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a coil component according to the second embodiment of the present invention. 3A is a view of the coil component shown in FIG. 2 viewed from the arrow F1 side, and FIG. 3B is a view viewed from the arrow F2 side. 4A and 4B are cross-sectional views of the flange portion of the coil component shown in FIG. FIG. 5: is a figure for demonstrating the terminal metal plate of the coil component of FIG. FIG. 6 is a diagram showing an example of the joint portion. 7A and 7B are views (No. 1) for explaining the method for manufacturing the coil component according to the second embodiment of the present invention. 8A and 8B are views (No. 2) for explaining the method for manufacturing the coil component according to the second embodiment of the present invention. FIG. 9 is a perspective view showing a coil component according to the third embodiment of the present invention. FIG. 10 is a diagram for explaining a joint portion of the coil component of FIG. 9. FIG. 11: is a figure which shows the electronic device provided with the coil component which concerns on the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. Components common to a plurality of drawings are designated by the same reference numerals throughout the plurality of drawings. It should be noted that the drawings are not necessarily drawn to scale for convenience of explanation.

FIG. 1 is a diagram showing a coil component 500 according to a first embodiment of the present invention. As shown in FIG. 1, the coil component 500 includes a base portion 1, a winding portion 2, a terminal electrode 4, and a joint portion 5. The winding portion 2 is formed by winding the conducting wire 3 around a part of the base portion 1. The terminal electrode 4 is made of a metal plate 6 and is provided on a part of the surface of the base portion 1. The joining portion 5 is formed by joining the end portion of the lead wire 3 and a part of the metal plate 6, and electrically joins the lead wire 3 and the terminal electrode 4. A tip surface 7 which is a cross section at the tip of the conductor 3 is exposed from the joint 5. The tip surface 7 is a cross section of the tip of the conductor wire 3, and can be visually recognized as a shape substantially the same as the cross sectional shape of the conductor wire 3 or as a trace of the cross section of the conductor wire 3. When the conductive wire 3 and the metal plate 6 are made of materials having different components, the tip surface 7 can be identified from the difference in the components.

Thus, since the tip end surface 7 which is a cross section at the tip of the conductor 3 is exposed from the joint 5, it can be confirmed that the conductor 3 is joined to the joint 5 with a sufficient length.

A coil component 600 according to a second embodiment of the present invention will be described with reference to FIGS. 2, 3(a) and 3(b), and FIGS. 4(a) and 4(b). FIG. 2 is a perspective view showing a coil component 600 according to the second embodiment of the present invention. 3A is a view of the coil component 600 as seen from the arrow F1 side of FIG. 2, and FIG. 3B is a view of the coil component 600 as seen from the arrow F2 side of FIG. Note that, in FIGS. 3A and 3B, a part of the winding portion 30 is not shown in order to clearly show the winding core 12. 4A is a cross-sectional view of the flange portion 14 of the coil component 600, and FIG. 4B is a cross-sectional view of the flange portion 16. As shown in FIGS. 2, 3(a) and 3(b), and FIGS. 4(a) and 4(b), the coil component 600 includes the drum core 10, the winding portion 30, the terminal electrode 40, The common mode filter includes 42, 44, 46 and joints 70, 72, 74, 76.

The drum core 10 includes a winding core portion 12, a flange portion 14 provided at one axial end portion of the winding core portion 12, and a flange portion 16 provided at the other axial end portion of the winding core portion 12. And The winding core 12 has, for example, a substantially rectangular cross section, but may have a polygonal shape such as a hexagon or an octagon, or a circular shape or an elliptical shape. The collar portions 14 and 16 have, for example, a rectangular parallelepiped shape having a concave portion. The drum core 10 is made of, for example, a Ni—Zn ferrite material, but may be made of another material. For example, the drum core 10 includes a soft magnetic alloy material such as Mn—Zn based ferrite material, Fe—Si—Cr based material, Fe—Si—Al based material, or Fe—Si—Cr—Al based material, or magnetic property such as Fe or Ni. It may be formed of a metallic material, an amorphous magnetic metallic material, or a nanocrystalline magnetic metallic material.

The dimensions of the coil component 600 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 600 is a dimension in the axial direction (X direction in FIG. 2) of the winding core portion 12 of the drum core 10, and the width is a direction orthogonal to the X direction and parallel to the mounting surface ( 2 is a dimension in the Y direction), and the height is a dimension in the direction orthogonal to the X direction and the Y direction (Z direction in FIG. 2). Regarding the dimensions of the drum core 10, for example, the length (dimension in the X direction of FIG. 2) is 3.0 mm, the width (dimension in the Y direction of FIG. 2) is 2.5 mm, and the height (dimension in the Z direction of FIG. 2) is It is 1.6 mm. The core portion 12 of the drum core 10 has a width (dimension in the Y direction of FIG. 2) of 1.6 mm and a height (dimension in the Z direction of FIG. 2) of 0.8 mm, for example.

The winding portion 30 includes two conducting wires 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 conductors 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 coating 38 made of polyamideimide. The core wire 36 may be formed of a metal other than copper, for example, silver, palladium, or a silver-palladium alloy. The insulating coating 38 may be formed of an insulating material other than polyamide-imide, for example, a resin material such as polyesterimide or polyurethane. The diameter of the conductive wires 32 and 34 is, for example, 0.05 mm. The conducting wires 32 and 34 are wound around the winding core 12 for 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 that face the circuit board when the coil component 600 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 recess 18 is formed on the end surface 14C of the flange portion 14, and a recess 20 is formed on the end surface 14D. The recesses 18 and 20 are formed at positions that straddle the vertical center of the end faces 14C and 14D. The recesses 18 and 20 are formed, for example, so as to be connected to the bottom surface portion from the end surfaces 14C and 14D via the tapered surface. The tapered surface and bottom surface of the recesses 18 and 20 are considered to be part of the end surfaces 14C and 14D, respectively. The angles of the tapered surfaces of the end faces 14C and 14D are appropriately set according to the direction in which the conducting wires 32 and 34 are drawn out. Similar to the recesses 18 and 20 formed on the flange portion 14, the flange portion 16 also has a recess 22 formed on the end surface 16C and a recess 24 formed on the end surface 16D. The thickness of the collar portions 14 and 16 is, for example, 0.6 mm. The depth of the concave portions 18, 20, 22, 24 is, for example, 0.5 mm, and the width of the bottom surface portion is, for example, 0.7 mm.

The terminal electrodes 40 and 42 are provided on the flange 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 made of a terminal metal plate 54, and the terminal electrode 46 is made of a terminal metal plate 56. The terminal metal plates 50, 52, 54, 56 are phosphor bronze plates plated with Sn, but other metals such as brass plates or tough pitch copper plates may be used.

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

The terminal metal plate 50 will be described with reference to FIG. FIG. 5 is a diagram for explaining the terminal metal plate 50 of the coil component 600. Since the terminal metal plates 52, 54, 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, 56 will be omitted.

As shown in FIG. 5, the terminal metal plate 50 extends from the metal plate body 60, the locking claws 62 extending from the metal plate body 60, and the locking claws 62 spaced apart from each other. And a joining claw 64. One end of the metal plate body 60 is pressed against the lower surface 14A of the flange portion 14 and the other end thereof is pressed against the upper surface 14B, and is attached to the surface of the flange portion 14. The locking claw 62 and the joining claw 64 are arranged in the recess 18 provided in the end surface 14C. The locking claws 62 are provided to hold the conducting wire 32 between the metal plate body 60 and the locking claws 62. The joining claw 64 is provided to join the lead wire 32 by, for example, welding, and electrically connect the lead wire 32 and the terminal metal plate 50.

As shown in FIGS. 2, 3(a) and 3(b), and FIGS. 4(a) and 4(b), one end of the conductive wire 32 and the joining claw 64 of the terminal metal plate 50 are For example, they are joined by welding. As a result, a ball-shaped joint 70 is formed, and the conductor 32 and the terminal electrode 40 are electrically connected by this joint 70. The other end of the conductive wire 32 and the joining claw 64 of the terminal metal plate 56 are joined, for example, by welding. As a result, a ball-shaped joint 76 is formed, and the conductor 32 and the terminal electrode 46 are electrically connected by this joint 76. Similarly, one end of the conductor wire 34 and the joint claw 64 of the terminal metal plate 52 are joined to form a ball-shaped joint portion 72. The joint portion 72 electrically connects the conductor wire 34 and the terminal electrode 42. Has been done. The other end of the conducting wire 34 and the joining claw 64 of the terminal metal plate 54 are joined to form a ball-shaped joining portion 74, and the joining wire 74 electrically connects the conducting wire 34 and the terminal electrode 44. .. The joints 70, 72, 74, 76 are welds when formed by welding such as laser welding or arc welding.

The conductive wire 32 is a base made up of a locking portion 90 formed by bending the locking claw 62 of the terminal metal plate 50 and a metal plate body 60 of the terminal metal plate 50 at a portion located between the winding portion 30 and the joint portion 70. It is sandwiched and locked with the portion 80. Further, the conductive wire 32 is formed from the metal plate body 60 of the terminal metal plate 56 and the metal plate body 60 of the terminal metal plate 56 in which the locking claw 62 of the terminal metal plate 56 is bent at the portion located between the winding portion 30 and the joint portion 76. It is sandwiched and locked with the base part 86.

Similarly, in the conductive wire 34, a portion located between the winding portion 30 and the joint portion 72 is formed by bending the locking claw 62 of the terminal metal plate 52, and the metal plate body 60 of the terminal metal plate 52. It is sandwiched and locked between the base part 82 and the base part 82. Further, the conductive wire 34 includes a locking portion 94 formed by bending the locking claw 62 of the terminal metal plate 54 and a metal plate body 60 of the terminal metal plate 54 at a portion located between the winding portion 30 and the joining portion 74. It is sandwiched and locked between the base portion 84 and the base portion 84.

The conducting wire 32 has a predetermined length portion protruding from the joint portion 70 from a front end surface 32a which is a cross section of one tip, and a predetermined length portion from a joint portion 76 from a front end surface 32b which is a cross section of the other tip. It is protruding. That is, one tip end surface 32 a of the conductor 32 is exposed from the joint portion 70, and the other tip end surface 32 b is exposed from the joint portion 76. Similarly, in the conductive wire 34, a predetermined length portion protrudes from the joint portion 72 from the front end surface 34a which is the cross section of one tip, and a predetermined length portion from the front end surface 34b which is the cross section of the other tip is the joint portion 74. Protruding from. Therefore, one end surface 34 a of the conductor 34 is exposed from the joint portion 72, and the other end surface 34 b is exposed from the joint portion 74. The length of the portions of the conductors 32, 34 protruding from the joints 70, 72, 74, 76 is preferably 0.05 mm or more for image processing. Further, in order to reduce the size of the coil component, it is preferable that this length is short, preferably 0.3 mm or less.

FIG. 6 is a diagram showing an example of the joint portion 70. Since the joint portions 72, 74, 76 have the same structure as the joint portion 70, only the joint portion 70 will be described, and the joint portions 72, 74, 76 will not be described. As shown in FIG. 6, the joint portion 70 is formed on the base portion 80 in a hemispherical shape. The hemispherical shape is not limited to a completely hemispherical shape, but also includes a case where the shape is close to a hemispherical shape. Since the tip of the conductive wire 32 projects from the hemispherical joint portion 70, the length of the projecting portion hardly affects the dimensions of the coil component. Further, the influence of the reflection of the joint portion 70 when the tip portion of the conductive wire 32 is subjected to image processing can be reduced, and it is easily detected even if the protruding length of the tip portion of the conductive wire 32 is short.

As described above, in the coil component 600, since the tip surfaces 32a and 32b of the conductor 32 are exposed from the joints 70 and 76, it is possible to confirm that the conductor 32 is joined to the joints 70 and 76 with a sufficient length. It can be confirmed by inspection with an inspection device by visual inspection and image identification. Similarly, since the tip surfaces 34a and 34b of the conductor 34 are exposed from the joints 72 and 74, it is visually and visually discriminated that the conductor 34 is joined to the joints 72 and 74 with a sufficient length. It can be confirmed by inspection with the device. Conventionally, since the tip end surface of the conductor wire is included in the joint portion and cannot be visually observed from the outside, the length of the conductor wire actually joined in the joint portion cannot be confirmed. Therefore, conventionally, the degree of electrical connection and mechanical connection between the conductive wire and the terminal electrode cannot be inspected, and the reliability cannot be improved. Like the coil component 600, the structure in which the tip surfaces 32a and 32b of the conductor 32 are exposed from the joints 70 and 76 ensures reliability of electrical connection and mechanical connection between the conductor 32 and the terminal electrodes 40 and 46. Due to the structure in which the tip surfaces 34a and 34b of the conductor 34 are exposed from the joints 72 and 74, the reliability of the electrical connection and mechanical connection between the conductor 34 and the terminal electrodes 42 and 44 is improved. Can be made.

As shown in FIG. 3A, it is preferable that the leading end of the conductive wire 32 projects from the joints 70 and 76. This facilitates confirmation that the conductive wire 32 is bonded to the bonding portions 70 and 76 with a sufficient length. The same applies to the conductor 34.

As shown in FIG. 3A, it is preferable that the leading end portion of the conductive wire 32 be within a range overlapping with the drum core 10 when the surface of the drum core 10 on which the joining portions 70 and 76 are provided is viewed in a plan view. It projects from 70 and 76. As a result, it is possible to prevent the tip portion of the conductive wire 32 from coming into contact with other members. The same applies to the conductor 34.

Next, a method for manufacturing the coil component 600 will be described. First, the drum core 10 is formed. For example, a binder is mixed with a Ni—Zn ferrite material, and the mixed material is compression-molded with a molding die to obtain a drum-shaped molded body. If necessary, deburring may be performed on this molded body. By sintering the molded body 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 mounted and arranged on the collar portion 14 of the drum core 10 by bending and caulking. The terminal metal plates 54 and 56 are mounted and arranged on 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 as many times as necessary, and the conducting wire 32 is wound around the winding core portion 12 outside the conducting wire 34 as many times as necessary to form the winding portion 30. The conducting wire 32 and the conducting wire 34 are wound the same number of times. The ends of the conductor 32 are drawn onto the terminal metal plates 50 and 56, and the conductor 32 and the terminal metal plates 50 and 56 are electrically connected to each other. Similarly, the end portion of the conductor wire 34 is drawn onto the terminal metal plates 52 and 54, and the conductor wire 34 and the terminal metal plates 52 and 54 are electrically connected to each other.

A method for manufacturing the coil component 600 will be described in detail with reference to FIGS. 7A to 8B. FIG. 7A to FIG. 8B are diagrams illustrating a method for manufacturing the coil component 600. 7A to 8B, the vicinity of one end of the conductor 32 joined to the terminal metal plate 50 is illustrated and described, but the vicinity of the other end of the conductor 32 and the conductor 34 are illustrated. Since the vicinity of both ends is also the same, the description is omitted here.

As shown in FIG. 7A, the terminal metal plate 50 having the metal plate main body 60 and the locking claws 62 and the joining claws 64 extending from the metal plate main body 60 is arranged on the flange portion 14 of the drum core 10 by bending or the like. To do. The conducting wires 32 and 34 are wound around the winding core portion 12 of the drum core 10 to form the winding portion 30. One end of the conductor 32 is pulled out onto the metal plate body 60 of the terminal metal plate 50 by using a jig 100 such as a clamp. Next, the insulating coating 38 on the portion of the conductor 32 that is sandwiched between the metal plate body 60 and the joining claw 64 is removed to expose the core wire 36. The insulating coating 38 can be removed by irradiating laser light, for example.

As shown in FIG. 7B, both the locking claws 62 and the joining claws 64 are bent at room temperature, and the conductor 32 is sandwiched between the metal plate body 60 and the locking claws 62 and the joining claws 64 to be fixed.

As shown in FIG. 8A, the conductor 32 is cut so that the tip of the conductor 32 is positioned outside the joining claw 64. For cutting the conductive wire 32, a generally used method can be used. The conducting wire 32 may be cut by push-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, since the bending process of the locking claws 62 and the joining claws 64 and the cutting of the conductive wire 32 can be performed at the same time, the manufacturing process can be reduced.

As shown in FIG. 8B, the conducting wire 32 and the joining claw 64 are joined together in a state in which the tip of the conducting wire 32 is located outside the joining claw 64. As a result, the joint portion 70 is formed, and the conductor wire 32 and the terminal metal plate 50 are electrically connected by the joint portion 70. The lead wire 32 and the joining claw 64 can be joined by welding such as laser welding or arc welding, but other methods such as thermocompression joining, ultrasonic joining, or solder joining may be used. As an example, the conducting wire 32 and the joining claw 64 can be joined by irradiating the joining claw 64 with a laser beam to melt the joining claw 64. When the joining claws 64 are melted, the melted portion rises, and the joint portion 70 that is a generally rounded welded portion is formed. Since the conducting wire 32 and the joining claw 64 are joined in a state in which the tip portion of the conducting wire 32 is located outside the joining claw 64, a predetermined length portion projects from the joining portion 70 from the tip end surface 32 a of the conducting wire 32. After that, a part of the tip end portion of the conductor wire 32 protruding from the joint portion 70 is cut to reduce the length of the tip end portion of the conductor wire 32 protruding from the joint portion 70, and the tip end portion of the conductor wire 32 overlaps the drum core 10. It is also possible to fit it in and project from the joint portion 70.

In the manufacturing method of the present embodiment, the case where the insulating coating 38 on the portion of the conductive wire 32 corresponding to the joining claw 64 is removed is shown as an example, but the insulating coating 38 is removed depending on the material of the insulating coating 38. The process may not be performed.

According to the manufacturing method of the coil component 600, as shown in FIGS. 8A and 8B, the lead wire 32 and the joining claw are set such that the tip of the lead wire 32 is located outside the joining claw 64. The joint portion 70 is formed by joining the lead wire 64 and the terminal metal plate 50 to each other. Thereby, before joining the conducting wire 32 and the joining claw 64, the position of the conducting wire 32 with respect to the joining claw 64 can be confirmed visually or by an inspection device by image identification. Therefore, it is possible to surely carry out the joining while confirming that the conductive wire 32 is welded to the joining portion 70 with a sufficient length.

After forming the joint portion 70, a part of the tip portion of the conductor wire 32 protruding from the joint portion 70 may be cut to shorten the length of the tip portion of the conductor wire 32 protruding from the joint portion 70. For example, a part of the tip of the conductor 32 may be cut so that the tip of the conductor 32 fits into the range overlapping with the drum core 10 and protrudes from the joint 70. As a result, it is possible to prevent the tip portion of the conductive wire 32 from coming into contact with other members. In the cutting of the conducting wire 32 of FIG. 8A, the conducting wire 32 may be previously cut into a short length so that the tip end of the conducting wire 32 fits in the range overlapping the drum core 10 and protrudes from the joint portion 70.

As shown in FIG. 7( b ), preferably, the terminal metal plate 50 includes, in addition to the joining claws 64, locking claws 62 extending from the metal plate body 60 separately from the joining claws 64. The conducting wire 32 is locked by the locking claws 62 so that is positioned outside the joining claws 64. As a result, it is possible to effectively prevent the position of the conductive wire 32 from moving with respect to the joining claw 64 before and after the joining of the conducting wire 32 and the joining claw 64.

FIG. 9 is a perspective view showing a coil component 700 according to the third embodiment of the present invention. FIG. 10 is a diagram for explaining the joint portion 70 of the coil component 700. As shown in FIGS. 9 and 10, in the coil component 700, the leading end of the conductive wire 32 does not protrude from the joints 70 and 76. One end surface 32a of the conductor 32 is flush with the surface of the joint 70. The other end surface 32b of the conductor 32 is also flush with the surface of the joint portion 76, but the illustration thereof is omitted here. Similarly to the conductor 32, the tip of the conductor 34 does not protrude from the joints 72 and 74, and the tip surfaces 34a and 34b are flush with the surfaces of the joints 72 and 74. Omit it. Since the other configurations of the coil component 700 are the same as those of the coil component 600, the description thereof will be omitted.

In the coil component 700, as shown in FIG. 10, the tip end surface 32 a of the conductive wire 32 is flush with the surface of the joint 70. Since the tip end surface 32a of the conductive wire 32 and the surface of the joint portion 70 are made of different materials, even if they are on the same surface, these two can be distinguished on the basis of the difference in color, the unevenness of the surface or the difference in reflection. .. Therefore, even in this case, it is possible to confirm that the conductive wire 32 is bonded to the bonding portion 70 with a sufficient length by visual inspection and inspection by the inspection device by image identification. In addition, it is possible to effectively prevent the tip portion of the conductive wire 32 from contacting another member.

The configuration in which the tip end surface 32a of the conductor 32 is flush with the surface of the joint 70 is a tip portion protruding from the joint 70 of the conductor 32 after the joint 70 is formed as shown in FIG. 8B. It is obtained by cutting all of. Therefore, the fact that the tip surface 32a of the conductive wire 32 and the surface of the joint portion 70 are the same surface is not limited to the case where they are completely the same surface, but also includes the case where there is a level difference due to a manufacturing error in cutting the conductive wire 32.

FIG. 11: is a figure which shows the electronic device 800 provided with the coil component 600 which concerns on the 2nd Embodiment of this invention. As illustrated in FIG. 11, the electronic device 800 includes the circuit board 102 and the coil component 600 mounted on the circuit board 102. The coil component 600 is mounted on the circuit board 102 by bonding the terminal electrodes 40, 42, 44, and 46 (only the terminal electrodes 40 and 46 are shown in FIG. 11) to the electrode 104 of the circuit board 102 by the solder 106. ing.

In the electronic device 800, the coil component 600 is mounted on the circuit board 102. Accordingly, it is possible to obtain the electronic device 800 including the coil component 600 in which it can be confirmed that the conductive wires 32 and 34 are bonded to the bonding portions 70, 72, 74, 76 with a sufficient length. That is, the electronic device 800 can be an electronic device in which a coil component in which a defective joint is suppressed is mounted, and can be an electronic device with improved reliability.

Although the electronic device 800 has been described by taking the case where the coil component 600 is mounted on the circuit board 102 as an example, the electronic device 800 may be mounted when the coil component 700 is mounted.

In the second and third embodiments, the case where the coil component is the common mode filter is shown as an example, but the present invention is not limited to this case. The coil component may be another coil component such as a coil component for a single line. The case where the drum core 10 in which the collar portions 14 and 16 are provided at both ends of the winding core portion 12 as the base portion is shown as an example, but the present invention is not limited to this case. It may be a core provided with (T core) or may be a core other than the core.

Although the embodiments of the invention of the present application have been described above in detail, the invention of the present application is not limited to the specific embodiments, and various modifications and alterations are possible within the scope of the gist of the invention of the present application described in the claims. It can be changed.

DESCRIPTION OF SYMBOLS 1 Base part 2 Circular part 3 Conductive wire 4 Terminal electrode 5 Joining part 6 Metal plate 7 Tip surface 10 Drum core 12 Core part 14, 16 Collar part 18, 20, 22, 24 Concave part 30 Circular part 32, 34 Conductive wire 32a, 32b, 34a, 34b Tip surface 36 Core wire 38 Insulating coating 40, 42, 44, 46 Terminal electrode 50, 52, 54, 56 Terminal metal plate 60 Metal plate body 62 Locking claw 64 Joining claw 70, 72, 74, 76 Joining part 80 , 82, 84, 86 Base portion 90, 92, 94, 96 Locking portion 500, 600, 700 Coil component 800 Electronic device

Claims (10)

A base portion,
A winding portion formed of a conductive wire wound around a part of the base portion,
A terminal electrode formed of a metal plate on a part of the surface of the base portion, the terminal electrode being connected to the lead wire drawn from the winding portion;
An end portion of the lead wire and a part of the metal plate are joined together, and a joining portion electrically connecting the lead wire and the terminal electrode is provided,
A coil component in which a tip surface, which is a cross section at the tip of the conductive wire, is exposed from the joint portion. The coil component according to claim 1, wherein a tip portion of the conductive wire projects from the joint portion. The coil component according to claim 2, wherein the tip end of the conductive wire is located within a range overlapping with the base portion when the surface of the base portion provided with the joint portion is viewed in a plan view and protrudes from the joint portion. .. The coil component according to claim 1, wherein the tip end surface of the conductive wire is flush with the surface of the welded portion. The coil component according to claim 1, wherein the terminal electrode has a locking portion that locks the lead wire. 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 disposed on the collar portion,
The conductor wire is wound around the winding core portion to form the winding portion and is drawn from the winding core portion to the terminal electrode arranged in the collar portion,
The coil component according to claim 1, wherein the joint portion is formed on the collar portion. A coil component according to any one of claims 1 to 6,
An electronic device comprising: a circuit board on which the coil component is mounted. A step of disposing a terminal metal plate having a metal plate body and a joining claw extending from the metal plate body on the base portion;
Winding a conducting wire around a part of the base portion to form a winding portion;
A step of joining the lead wire and the joining claw to form a joining portion for electrically connecting the lead wire and the terminal metal plate in a state where the tip end portion of the lead wire is located outside the joining claw. And a method of manufacturing a coil component, comprising: 9. The method of manufacturing a coil component according to claim 8, further comprising a step of cutting a part or all of a tip portion of the conductive wire protruding from the joint portion after the step of forming the joint portion. The coil component according to claim 8 or 9, further comprising a step of locking the conductive wire with a locking claw included in the terminal metal plate so that a tip portion of the conductive wire is located outside the joining claw. Manufacturing method.

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