JP2020074459A - Coil component - Google Patents

Abstract

To provide a coil component in which a wire is cut and cannot be properly temporarily fixed due to the strength of caulking of a terminal electrode when the wire is temporarily fixed to the terminal electrode and the thinned wire is welded to the terminal electrode.SOLUTION: A coil component 1 includes terminal electrodes 27 to 30 having connecting portions to which the ends of wires 23 and 24 are electrically connected. The connection portion 37 of each terminal electrode has a reference surface 37b. The end portion of the wire and the connection portion of the terminal electrode are connected to each other via a weld mass 43 that rises from the reference surface. The connection portion of the terminal electrode is provided with a protrusion 41 protruding in the same direction as a cover portion 40 that defines the upper limit of the floating of the wire from the reference surface. The protrusion prevents the wire from being bent from the terminal electrode by being caught by the wire when the wire is wound.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coil component, and particularly to a coil component including a wire and a terminal electrode to which the wire is electrically connected.

  A technique of interest to the present invention is described in, for example, Japanese Patent No. 3909834 (Patent Document 1). Patent Document 1 describes a wire-wound coil component including a wire and a terminal electrode to which the wire is electrically connected.

  8 and 9 are cited from Patent Document 1, and correspond to FIGS. 1B and 1C in Patent Document 1, respectively. FIGS. 8 and 9 show one flange portion 71 which is a part of the core provided in the coil component, the terminal electrode 72 arranged there, and the end portion of the wire 73 connected to the terminal electrode 72. There is.

  The terminal electrode 72 extends along the outer surface of the flange 71 along the outer surface of the flange 71, and extends from the base 74 along the upper surface of the flange 71 through a bent portion, and receives the end of the wire 73. The receiving portion 75 and the folded-back piece 76 extending from the receiving portion 75 along the inner end surface of the collar portion 71 via the bent portion are provided. As well shown in FIG. 8, the terminal electrode 72 further extends from the side edge of the receiving portion 75 via the bent portion 77, and the welding piece 78 to be welded to the wire 73 and the wire 73 at the time of welding. And a temporary fixing portion 79 for temporarily fixing the.

  With respect to the above-mentioned welding piece 78, a state before performing the welding step is shown in FIG. 8, and a state after the welding step is shown in FIG. FIG. 9 shows a weld mass 80 generated by welding. The weld mass 80 is generated by cooling and solidifying a metal melted during welding.

  The details of the welding process are as follows. At the stage before the welding process, as shown in FIG. 8, the wire 73 is inserted between the receiving portion 75 and the welding piece 78 and the temporary fixing portion 79. Next, in order to temporarily fix the wire 73 in this state, the temporary fixing portion 79 is caulked using a metal fitting so that the wire 73 is sandwiched between the receiving portion 75 and the temporary fixing portion 79.

  Next, the wire 73 and the welding piece 78 are welded. More specifically, laser welding is applied. The welding light 78 is irradiated with the laser light, so that the wire 73 and the welding piece 78 are melted with each other. As a result, the weld mass 80 is formed as described above.

Japanese Patent No. 3909834

  By the way, along with the miniaturization of electronic circuits, it is necessary to make the coil components used therein smaller, and in order to meet the demand, there is a demand to make wires used in wire-wound coil components thinner.

  In the coil component described in Patent Document 1, as described above, the wire 73 is temporarily fixed by caulking the temporary fixing portion 79 using a metal fitting. In the above-described welding process, when forming a molten portion to be the weld mass 80, the wire 73 tends to float from the receiving portion 75 due to residual tension, but the temporary fixing portion 79 causes the wire 73 to receive the wire 75. It also has a function to prevent it from rising. Therefore, after welding, the wire 73 can be positioned along and close to the receiving portion 75.

  However, the thinner the wire 73, the more likely the following problems occur.

  Problem 1: The wire 73 is cut by the edge portion of the temporary fixing portion 79 of the terminal electrode 72 to be caulked.

  Problem 2: Due to the springback of the terminal electrode 72 that occurs after the caulking process, the temporary fixing portion 79 opens to the receiving portion 75, and the wire 73 cannot be properly temporarily fixed.

  It should be noted here that when the caulking is weakened to reduce the problem 1, the problem 2 is likely to occur, and conversely, when the caulking is strongly performed to reduce the problem 2, the problem 1 is likely to occur. ,That's what it means. That is, it is necessary to control the contradictory phenomena. Therefore, the finer the wire 73, the narrower the allowable crimping range becomes, and the more difficult the machining becomes.

  Therefore, an object of the present invention is to provide a coil component that can solve the above problems.

  The present invention is directed to a coil component including a wire and a terminal electrode having a connecting portion to which an end of the wire is electrically connected. The connection portion of the terminal electrode has a reference surface, and the end portion of the wire and the connection portion of the terminal electrode are connected to each other via a weld lump that rises from the reference surface.

  In order to solve the above-mentioned technical problem, the present invention is characterized in that the terminal electrode further includes a protrusion for preventing the wire from warping from the terminal electrode.

  Here, the protrusion can prevent the wire from warping from the terminal electrode without relying on the temporary fixing portion 79 which is the target of the caulking process described in Patent Document 1.

  In this invention, it is preferable that the protrusion is provided at the connection portion of the terminal electrode.

  Further, it is preferable that the protrusion protrudes from the connection portion of the terminal electrode in the direction in which the reference plane extends.

  Further, in the present invention, preferably, the coil component further includes a cover portion for defining an upper limit of floating of the wire from the reference surface, and the cover portion is provided in a direction perpendicular to a direction in which the reference surface extends. As seen, the wire is positioned so as to cover at least a part of the wire, and the protrusion projects in the same direction as the cover portion.

  More preferably, the terminal electrode has a rising portion that extends in a direction substantially perpendicular to the direction in which the reference surface extends from the end edge of the connecting portion, the cover portion is provided in the rising portion, and the protrusion is provided between the cover portion and the cover portion. Are located at predetermined intervals. If the cover portion is provided at the rising portion, it is easy to dispose the cover portion at the position where the wire is covered.

  A coil component according to the present invention includes a winding core portion in which a wire is spirally wound, and first and second brim portions provided at first and second opposite ends of the winding core portion, respectively. It may further include a core. In this case, the terminal electrodes are attached to the first and second flanges, respectively.

  According to the present invention, the protrusion prevents the wire from warping from the terminal electrode. Further, since the projection is not crimped, it is possible to avoid the wire breakage caused by the crimping.

  The structure in which the wire is temporarily fixed by caulking the temporary fixing portion as in the technique described in Patent Document 1 described above requires a fine bending process in the manufacturing process in which the terminal electrode is attached to the core, and therefore the process is performed. However, in the worst case, there is a risk of peeling the terminal electrode from the core. However, in the present invention, since neither part of the terminal electrode is subjected to the caulking process, it is possible to avoid the problem that the caulking process causes complication of the process or the terminal electrode is peeled off from the core. be able to.

  From the above, it is possible to sufficiently meet the demand for making the wire finer, and as a result, it is possible to reduce the size of the coil component.

FIG. 1 is a perspective view showing an appearance of a common mode choke coil 1 as a coil component according to a first embodiment of the present invention from a mounting surface side. FIG. 2 is an enlarged front view showing a part of the common mode choke coil shown in FIG. 1 on the side of a first collar portion 4 provided in a core 2. It is a bottom view which expands and shows a part of the structure by the side of the collar part 4 shown in FIG. 2 from the mounting surface side. It is a figure corresponding to FIG. 2, and shows the state before welding. It is an expanded sectional view of the wire 23 with which the common mode choke coil 1 shown in FIG. 1 is equipped. It is a figure which shows the photograph which image | photographed the electrical connection part of the wire 23 and terminal electrode 27 shown in FIG. FIG. 8 is a view for explaining the second embodiment of the present invention and is a view corresponding to FIG. 4. A perspective view showing one flange portion 71 which is a part of a core included in the coil component described in Patent Document 1, a terminal electrode 72 arranged there, and an end portion of a wire 73 connected to the terminal electrode 72. And shows the state before welding. It is a figure corresponding to FIG. 8, and shows the state after welding.

  In describing the coil component according to the present invention, a common mode choke coil is taken as an example of the coil component. A common mode choke coil 1 as a coil component according to a first embodiment of the present invention will be described mainly with reference to FIG.

  The common mode choke coil 1 includes a drum-shaped core 3 having a winding core 2. The drum-shaped core 3 includes first and second flange portions 4 and 5 provided at first and second opposite ends of the winding core portion 2, respectively. Although not shown, the common mode choke coil 1 may further include a plate-shaped plate-shaped core provided between the first and second flanges 4 and 5. The drum-shaped core 3 and the plate-shaped core are preferably made of ferrite, but may be made of a material other than ferrite.

  The Curie temperature of the drum-shaped core 3 made of ferrite is preferably 150 ° C. or higher. This is because the inductance value can be maintained above a certain level from a low temperature to 150 ° C. Further, the relative magnetic permeability of the drum core 3 is preferably 1500 or less. According to this structure, it is not necessary to use a special material for high magnetic permeability as the structure or material of the drum-shaped core 3. Therefore, the degree of freedom in designing the drum core 3 is improved, and for example, the drum core 3 having a Curie temperature of 150 ° C. or higher can be easily designed. As described above, according to the above configuration, it is possible to provide the common mode choke coil 1 having a good inductance characteristic at a high temperature and good temperature characteristics.

  The above-mentioned plate-like core (not shown) also preferably has a Curie temperature of 150 ° C. or higher and a relative magnetic permeability of 1500 or lower.

  The collar portions 4 and 5 respectively face the core portion 2 side and inner end surfaces 7 and 8 on which the respective end portions of the winding core portion 2 are located, and the outer end surface 9 opposite to the inner end surfaces 7 and 8 and face outward. And 10. Further, the flange portions 4 and 5 respectively have bottom surfaces 11 and 12 which face the mounting substrate (not shown) side at the time of mounting, and top surfaces 13 and 14 opposite to the bottom surfaces 11 and 12. The plate-shaped core (not shown) described above is joined to the top surfaces 13 and 14 of the collar portions 4 and 5. Further, the first flange portion 4 has first and second side surfaces 15 and 16 extending in a direction connecting the bottom surface 11 and the top surface 13 and facing sideways opposite to each other. 5 has first and second side surfaces 17 and 18 extending in a direction connecting the bottom surface 12 and the top surface 14 and facing sideways opposite to each other.

  Further, cutout-shaped recesses 19 and 20 are provided at both ends of the bottom surface 11 of the first flange portion 4. Similarly, cutout-shaped recesses 21 and 22 are provided at both ends of the bottom surface 12 of the second flange 5.

  The common mode choke coil 1 further includes first and second wires 23 and 24 that are spirally wound around the winding core 2. In FIG. 1, only the ends of the wires 23 and 24 are shown, and the wires 23 and 24 on the winding core 2 are not shown. 2 to 4, the wires 23 and 24 on the winding core 2 are not shown. As shown in FIG. 5 for one wire 23, each of the wires 23 and 24 has a linear center conductor 25 and an insulating coating layer 26 that covers the peripheral surface of the center conductor 25.

  The center conductor 25 is made of, for example, a copper wire. The insulating coating layer 26 is preferably made of a resin containing at least an imide bond, such as polyamide-imide or imide-modified polyurethane. According to this configuration, the insulating coating layer 26 can be provided with heat resistance such that it does not decompose even at 150 ° C., for example. Therefore, the line capacitance does not change even at a high temperature such as 150 ° C., and the Sdd11 characteristic can be improved. Further, the effectiveness of the effect of excellent noise suppressing effect can be enhanced even at a high temperature such as 150 ° C.

  The first and second wires 23 and 24 are wound in the same direction while being parallel to each other. At this time, the wires 23 and 24 are alternately arranged in the axial direction of the winding core 2 even if they are wound in two layers such that one of them is on the inner layer side and the other is on the outer layer side. The bifilar winding may be performed by winding in parallel with each other.

  The diameter D of the central conductor 25 is preferably 35 μm or less. According to this configuration, the diameters of the wires 23 and 24 can be reduced, so that the number of windings of the wires 23 and 24 around the winding core portion 2 can be increased and the size can be reduced without changing the number of windings of the wires 23 and 24. That is, it is possible to increase the wire interval without changing the wires 23 and 24 and the outer shape of the coil. Further, since the ratio of the wires 23 and 24 to the outer shape of the coil is reduced, the dimensions of other portions such as the drum core 3 can be enlarged, so that the characteristics can be further improved.

  The diameter D of the center conductor 25 is preferably 28 μm or more. According to this configuration, it is possible to prevent disconnection of the central conductor 25 from occurring easily.

  The thickness T of the insulating coating layer 26 is preferably 6 μm or less. According to this configuration, the diameters of the wires 23 and 24 can be reduced, so that the number of windings of the wires 23 and 24 around the winding core portion 2 can be increased and the size can be reduced without changing the number of windings of the wires 23 and 24. That is, it is possible to increase the wire interval without changing the wires 23 and 24 and the outer shape of the coil. Further, since the proportion of the wires 23 and 24 in the coil outer shape is reduced, the dimensions of other portions such as the drum core 3 can be increased, so that the characteristics can be further improved.

  Further, the thickness dimension T of the insulating coating layer 26 is preferably 3 μm or more. According to this configuration, the distance between the central conductors 25 of the wires 23 and 24 that are adjacent to each other in the wound state can be increased, so that the line capacitance can be reduced, and thus the Sdd11 characteristic can be improved.

  The common mode choke coil 1 further includes first to fourth terminal electrodes 27 to 30. Of these first to fourth terminal electrodes 27 to 30, the first and third terminal electrodes 27 and 29 are arranged in the direction in which the first and second side surfaces 15 and 16 of the first collar portion 4 face each other. They are arranged and attached to the first collar 4 via an adhesive. The second and fourth terminal electrodes 28 and 30 are arranged in a direction in which the first and second side surfaces 17 and 18 of the second flange portion 5 are opposed to each other, and the second flange portion 5 is provided with an adhesive agent. Can be installed.

  The first end of the first wire 23 is electrically connected to the first terminal electrode 27, and the second end of the first wire 23 opposite to the first end is electrically connected to the second terminal electrode 28. Connected. On the other hand, the first end of the second wire 24 is electrically connected to the third terminal electrode 29, and the second end of the second wire 24 opposite to the first end is electrically connected to the fourth terminal electrode 30. Connected to each other.

  The first terminal electrode 27 and the fourth terminal electrode 30 have the same shape as each other, and the second terminal electrode 28 and the third terminal electrode 29 have the same shape as each other. Further, the first terminal electrode 27 and the third terminal electrode 29 are plane-symmetrical with each other, and the second terminal electrode 28 and the fourth terminal electrode 30 are plane-symmetrical with each other. Therefore, any one of the first to fourth terminal electrodes 27 to 30, for example, the first terminal electrode 27 shown best in FIG. 1 and shown in FIGS. 2 to 4. Will be described in detail, and description of the details of the second, third and fourth terminal electrodes 28, 29 and 30 will be omitted.

  The terminal electrode 27 is usually manufactured by subjecting one metal plate made of a copper alloy such as phosphor bronze or tough pitch copper to progressive press working. The metal plate used as the material of the terminal electrode 27 has a thickness of 0.15 mm or less, for example, 0.1 mm.

  The terminal electrode 27 includes a base portion 31 extending along the outer end surface 9 of the collar portion 4, and a first bent portion 32 that covers a ridge portion where the outer end surface 9 of the collar portion 4 and the bottom surface 11 intersect from the base portion 31. Via the mounting portion 33 extending along the bottom surface 11 of the collar portion 4. When the common mode choke coil 1 is mounted on a mounting substrate (not shown), the mounting portion 33 is a portion electrically and mechanically connected to a conductive land on the mounting substrate by soldering or the like.

  Further, the terminal electrode 27 includes a rising portion 35 extending from the mounting portion 33 via the second bent portion 34, and a connecting portion 37 extending from the rising portion 35 via the third bent portion 36. The rising portion 35 extends along a vertical wall 38 defining the depression 19, and the connecting portion 37 extends along a bottom wall 39 defining the depression 19. The connection portion 37 is a portion that extends along the end of the wire 23 and electrically and mechanically connects the wire 23 to the terminal electrode 27.

  More specifically, the connecting portion 37 of the terminal electrode 27 has a reference surface 37b. The end portion of the wire 23 and the connecting portion 37 are connected to each other at the tip portion 37a of the connecting portion 37 via a welded mass portion 43 rising from the reference surface 37b. Further, the terminal electrode 27 is provided with a cover portion 40 for defining the upper limit of the floating of the wire 23 from the reference surface 37b. The cover portion 40 is provided at a portion other than the connecting portion 37, for example, a rising portion 35 extending from the edge of the connecting portion 37 in a direction substantially perpendicular to the extending direction of the reference surface 37b. In this embodiment, the cover portion 40 extends from the rising portion 35 in a non-bendable state, and is formed in a protruding shape protruding from the rising portion 35.

  As shown in FIG. 3, the cover portion 40 is positioned so as to cover at least a part of the wire 23 when viewed in a direction perpendicular to the extending direction of the reference surface 37b. However, the cover portion 40 is only required to be capable of functioning to define the upper limit of the floating of the wire 23 from the reference surface 37b, and therefore, as shown in FIG. When viewed in a direction perpendicular to the extending direction of 37b, the connecting portion 37 may not overlap.

  In this embodiment, a part of the wire 23 covered by the cover portion 40 has a circular cross section. Moreover, a part of the wire 23 covered by the cover portion 40 is not fixed. The cover portion 40 faces the wire 23 only on one surface.

  As shown in FIG. 2, when viewed in a direction parallel to the extending direction of the reference surface 37b, the distance H1 between the reference surface 37b and the apex of the weld mass 43, the reference surface 37b, and the cover portion. The relationship with the distance H2 with respect to 40 is H2 <H1, and the distance H2 is preferably larger than the diameter of the wire 23.

  With this configuration, the wire 23 can be smoothly guided between the cover portion 40 and the reference surface 37b so that the upper limit of the floating from the reference surface 37b can be defined. As described with reference to FIG. 5, the wire 23 normally has a linear center conductor 25 and an insulating coating layer 26 that covers the peripheral surface of the center conductor 25. Is the diameter of the wire 23 in the portion covered by the cover portion 40. That is, the diameter of the wire 23 is the diameter (D + 2T) of the center conductor 25 and the insulating coating layer 26 when the wire 23 has the insulating coating layer 26 in the portion covered by the cover portion 40. When the wire 23 in the portion covered with 40 does not have the insulating coating layer 26, the diameter is only the center conductor 25 (D).

  In the above-described configuration, the wire 23 is in contact with the cover portion 40 (not shown) even if it is not in contact with either the cover portion 40 or the reference surface 37b as shown in FIG. It may not be in contact with 37b.

  Further, in this embodiment, as well shown in FIG. 3, the connection portion 37 of the terminal electrode 27 is provided with the protrusion 41 that projects in the same direction as the cover portion 40. The protrusion 41 is prevented from catching on the wire 23 when the wire 23 is wound, and thereby preventing the wire 23 from warping from the terminal electrode 27. The protrusion 41 projects in the direction in which the reference surface 37b extends from the connecting portion 37 of the terminal electrode 27 and in the same direction as the cover portion 40. In this state, the protrusion 41 is located at a predetermined distance from the cover 40.

  It is preferable that the above-mentioned connecting portion 37 is located at a predetermined distance from the collar portion 4, as well shown in FIGS. 2 and 3. More specifically, the rising portion 35 and the connecting portion 37 are located at a predetermined distance from the vertical wall 38 and the bottom wall 39 that define the recess 19, and are not in contact with the vertical wall 38 and the bottom wall 39. Preferably.

  The base portion, the first bent portion, the mounting portion, the second bent portion, the rising portion, the third bent portion, the connecting portion, the tip portion, the reference surface, the cover portion, the protrusion, and the base portion of the first terminal electrode 27 described above. The reference numerals 31, 32, 33, 34, 35, 36, 37, 37a, 37b, 40, 41 and 43 used to refer to the welded mass portions respectively indicate the second, third and fourth portions as necessary. Corresponding base portions of the terminal electrodes 28, 29, and 30, first bending portion, mounting portion, second bending portion, rising portion, third bending portion, connection portion, tip portion, reference surface, cover portion, protrusion , And weld mass, respectively.

  Usually, the step of winding the wires 23 and 24 on the winding core 2 is performed before the step of connecting the wires 23 and 24 and the terminal electrodes 27 to 30 described above. In the winding step, the wires 23 and 24 are traversed and supplied toward the winding core 2 from the nozzle while the drum-shaped core 3 is rotated around the central axis of the winding core 2. As a result, the wires 23 and 24 are spirally wound on the winding core 2. When the wire 23 is wound, as described above, the protrusion 41 is caught on the wire 23, thereby preventing the wire 23 from warping from the terminal electrode 27.

  In this winding step, since the drum core 3 is rotated as described above, the drum core 3 is held by the chuck connected to the rotary drive source. The chuck is designed to hold one flange portion of the drum-shaped core 3, for example, the first flange portion 4.

  The number of turns of each of the first and second wires 23 and 24 on the winding core 2 is preferably 42 turns or less. This is because the total length of the wires 23 and 24 can be shortened, so that the Sdd11 characteristic can be improved. In order to secure the inductance value, the number of turns of each of the wires 23 and 24 is preferably 39 turns or more.

  After the winding process is completed, a connecting process of the wires 23 and 24 and the terminal electrodes 27 to 30 described below is performed.

  The process of connecting the first wire 23 to the first terminal electrode 27 will be described below as a representative. FIG. 4 is a diagram corresponding to FIG. 2 and shows a state before welding.

  At the stage where the above-mentioned winding step is completed, the end portion of the wire 23 is in a state of being pulled out onto the tip portion 37a of the connecting portion 37, as shown in FIG. Further, the insulating coating layer 26 is removed from the entire end of the wire 23. Laser light irradiation is applied to remove the insulating coating layer 26, for example.

  Next, the laser beam 42 for welding is applied to a region of the wire 23 where the central conductor 25 exposed from the insulating coating layer 26 and the tip portion 37a overlap each other. As a result, the central conductor 25 and the tip portion 37a that receives it are melted. At this time, the melted central conductor 25 and the tip portion 37a are made into a ball shape by the surface tension acting thereon, and the weld mass portion 43 is formed. That is, the weld mass 43 is formed by integrating the central conductor 25 and the terminal electrode 27 (the tip portion 37a), and the center conductor 25 is taken into the weld mass 43.

  Here, the central conductor 25 of the wire 23 tends to move in the apex direction of the weld mass 43, that is, the wire 23 tends to float from the reference surface 37b of the connecting portion 37. In this case, when an external force is applied to the wire 23, the wire 23 is easily cut. Alternatively, when the common mode choke coil 1 is coated with, for example, a moisture-proof resin, the resin flows between the reference surface 37b of the connection portion 37 of the terminal electrode 27 and the wire 23, and the resin expands and contracts. When repeated, the wire 23 is easily cut.

  However, in this embodiment, the cover portion 40 defines the upper limit of the floating of the wire 23 from the reference surface 37b in the connection portion 37 of the terminal electrode 27, and thus the wire 23 welded to the connection portion 37 of the terminal electrode 27 is defined. It is possible to maintain a state in which is positioned along and close to the reference surface 37b. Therefore, it is possible to realize high reliability with respect to prevention of disconnection of the wire 23 and further regarding connection between the wire 23 and the connection portion 37. Therefore, the wire 23 can be made thinner, and as a result, the common mode choke coil 1 as a coil component can be downsized.

  As described above, preferably, the connecting portion 37 is located at a predetermined distance from the collar portion 4 and is not in contact with the collar portion 4. Although this configuration is not essential, according to this configuration, in the welding process described above, the temperature rise at the connection portion 37 is less likely to be transmitted to the flange portion 4 side, and the adverse effect on the drum core 3 due to heat is reduced. You can

  FIG. 6 shows a photograph of the electrical connection portion between the wire and the terminal electrode in the actual product of the common mode choke coil. The photograph of FIG. 6 is taken from a direction intermediate between the front direction shown in FIG. 2 and the bottom direction shown in FIG. In FIG. 6, the lower right round portion corresponds to the weld mass 43. A state in which the wire 23 is pulled out from the weld mass portion 43 and the upper limit of floating of the wire 23 from the reference surface 37 b is defined by the cover portion 40 can be seen in FIG. 6.

  By the welding process, not only the tip portion 37a of the connection portion 37 but also the connection portion 37 and the weld mass portion 43 remaining after welding are welded to each other and are in contact with each other. The center conductor 25 of the wire 23 is included in the weld mass 43. Further, since the insulating coating layer 26 is removed over the entire circumference of the end portion of the wire 23, the center conductor 25 of the wire 23 is also welded to the connection portion 37 and the weld mass portion 43 at the end portion of the wire 23. ing. Furthermore, in the weld mass 43, there is no substance derived from the insulating coating layer 26. Regarding the distinction between the connecting portion 37 and the weld lump portion 43, the portion whose outer edge shape remains plate-like may be referred to as the connecting portion 37, and the portion whose outer edge shape is curved may be the weld lump portion 43. it can.

  In this way, a strong weld is achieved. Further, since the central conductor 25 of the wire 23 is located between the connection portion 37 and the weld lump portion 43 and the entire circumference thereof is included in the weld lump portion 43, higher mechanical strength, lower electric resistance, Higher stress resistance, higher chemical erosion resistance, etc. are obtained, and higher reliability for the welded structure is realized. In addition, since there is no substance derived from the insulating coating layer 26 in the weld mass 43, blowholes at the time of melting can be reduced, and in this respect also, a highly reliable weld structure can be obtained. ..

  Although the connection between the first terminal electrode 27 and the first wire 23 has been described above, the same steps are performed for the connection between the other terminal electrodes 28 to 30 and the wire 23 or 24, and the similar connection structure is obtained. Is obtained.

  As can be seen from FIG. 1, the first and fourth terminal electrodes 27 and 30 are located on the opposite side of the first and second wires 23 and 24 from the lead-out side from the winding core 2. The second and third terminal electrodes 28 and 29 are located on the lead-out side of the first and second wires 23 and 24 from the winding core part 2, respectively. Here, “the side where the first and second wires 23 and 24 are pulled out from the winding core portion 2” is a portion where the first and second wires 23 and 24 are separated from the surface of the winding core portion 2. It means the side to be located.

  In this case, the respective ends of the first and second wires 23 and 24 connected to the second and third terminal electrodes 28 and 29, respectively, are connected to the ends of the connecting portion 37 even if the cover portion 40 is not present. It can be located along and close to the reference plane 37b.

  On the other hand, each end of the first and second wires 23 and 24 connected to the first and fourth terminal electrodes 27 and 30, respectively, has a reference surface of the connection portion 37 unless the cover portion 40 is present. It easily floats up from 37b, and it is difficult to position it along and close to the reference surface 37b. Therefore, the cover portion 40 is essential for the first and fourth terminal electrodes 27 and 30.

  From the above, it can be said that the cover portion 40 is sufficient if it is provided on at least the first and fourth terminal electrodes 27 and 30. However, for example, when the winding directions of the wires 23 and 24 on the winding core portion 2 are reversed, the pulling-out sides of the wires 23 and 24 from the winding core portion 2 are reversed. And the cover portion 40 must be provided on the third terminal electrodes 28 and 29. In this embodiment, in consideration of the above circumstances and the like, in order to enhance the versatility of the terminal electrodes 27 to 30, all the terminal electrodes 27 to 30 are provided with the cover portion 40.

  FIG. 7 is for explaining the second embodiment of the present invention and corresponds to FIG. In FIG. 7, elements corresponding to those shown in FIG. 4 are designated by the same reference numerals, and redundant description will be omitted.

  FIG. 7 shows a modification of the form of the cover part. The cover portion 40a shown in FIG. 7 is provided on the rising portion 35 of the terminal electrode 27, but is not provided in the shape of a protrusion but is provided by the lower edge of the wide portion provided on a part of the rising portion 35.

  As can be seen from this, the cover part is not a target of the caulking process on the terminal electrode, and it can define the upper limit of the wire floating from the reference plane of the connection part and the extension of the reference plane. The wire may be provided in any form as long as it is positioned so as to cover a part of the wire when viewed in the direction perpendicular to the direction. Therefore, as another embodiment of the present invention, the cover portion may be a part of the core instead of a part of the terminal electrode. Further, the cover portion may be formed by applying a material such as an adhesive, which is separate from the terminal electrode or the core, to a specific portion of the terminal electrode or the core.

  The coil component according to the present invention has been described above based on a more specific embodiment relating to a common mode choke coil, but this embodiment is merely an example, and various other modifications are possible.

  For example, the number of wires provided in the coil component, the winding direction of the wire, the number of terminal electrodes, and the like can be changed according to the function of the coil component.

  Further, in the above embodiment, laser welding is used to connect the terminal electrode and the wire, but the present invention is not limited to this, and arc welding or the like may be used.

  Moreover, the coil component according to the present invention may not include the core.

1 Common mode choke coil (coil parts)
2 winding core part 3 drum-shaped core 4,5 collar part 23,24 wire 27-30 terminal electrode 35 rising part 37 connection part 37a reference surface 40,40a cover part 41 protrusion 42 laser beam 43 weld mass part

Claims (6)

Wire,
A terminal electrode having a connecting portion to which the end of the wire is electrically connected,
Equipped with
The connection portion of the terminal electrode has a reference surface, the end portion of the wire and the connection portion of the terminal electrode are connected to each other via a welding mass portion rising from the reference surface,
The terminal electrode further comprises a protrusion for preventing the wire from warping from the terminal electrode,
Coil parts.   The coil component according to claim 1, wherein the protrusion is provided on the connection portion of the terminal electrode.   The coil component according to claim 2, wherein the protrusion projects from the connection portion of the terminal electrode in a direction in which the reference surface extends. The wire further comprises a cover portion for defining an upper limit of floating from the reference surface,
The cover portion is located so as to cover at least a part of the wire when viewed in a direction perpendicular to the extending direction of the reference plane,
The protrusion projects in the same direction as the cover portion,
The coil component according to any one of claims 1 to 3. The terminal electrode has a rising portion extending in a direction substantially perpendicular to a direction in which the reference surface extends from an end edge of the connecting portion, the cover portion is provided in the rising portion, and the protrusion is the cover portion. Is located at a predetermined distance between
The coil component according to claim 4. The core further includes a winding core portion in which the wire is spirally wound, and first and second flange portions respectively provided at first and second opposite ends of the winding core portion. ,
The terminal electrodes are attached to the first and second flanges, respectively.
The coil component according to claim 1.