JP6844724B2 - Coil parts - Google Patents

Description

The present invention relates to coil components, and more particularly to coil components that include wires and terminal electrodes to which the wires are electrically connected.

Techniques of interest for this invention are described, for example, in Japanese Patent No. 3909834 (Patent Document 1). Patent Document 1 describes a wire and a winding type coil component including a terminal electrode to which the wire is electrically connected.

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

The terminal electrode 72 extends from the base portion 74 arranged along the outer end surface of the collar portion 71 and from the base portion 74 via the bent portion along the upper surface of the collar portion 71 as shown in the drawing, and receives the end portion of the wire 73. It includes a receiving portion 75 and a folded piece 76 extending from the receiving portion 75 via a bent portion along the inner end surface of the flange portion 71. As is 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 weld piece 78 to be welded to the wire 73 and the wire 73 at the time of welding. It is provided with a temporary fixing portion 79 for temporarily fixing the wire.

With respect to the above-mentioned weld piece 78, the state before the welding process is performed is shown in FIG. 8, and the state after the welding process is shown in FIG. FIG. 9 shows a welded mass 80 generated by welding. The weld ingot 80 is formed by cooling and solidifying the molten metal at the time of welding.

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

Next, the wire 73 and the weld piece 78 are welded. More specifically, laser welding is applied. The laser beam irradiates the weld piece 78, whereby the wire 73 and the weld piece 78 are melted together. As a result, as described above, the weld ingot 80 is formed.

Japanese Patent No. 3909834

By the way, with the miniaturization of electronic circuits, it is necessary to make the coil parts used therein smaller, and in order to cope with this, there is a demand for making the wires used for the winding type coil parts thinner.

In the coil component described in Patent Document 1, as described above, the wire 73 is temporarily fixed by caulking the temporarily fixed portion 79 using a metal fitting. In the above-mentioned welding step, when the molten portion to be the weld mass portion 80 is formed, the wire 73 tends to be lifted from the receiving portion 75 due to the residual tension, but in the temporary fixing portion 79, the wire 73 is the receiving portion 75. It also has a function to prevent it from rising from the surface. 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 will 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 generated after caulking, the temporary fixing portion 79 opens with respect to the receiving portion 75, and the wire 73 cannot be temporarily fixed properly.

It should be noted here that if the caulking is weakened in order to alleviate the problem 1, the problem 2 is likely to occur, and conversely, if the caulking is strongly performed in order to alleviate 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 thinner the wire 73, the narrower the allowable caulking range, and the more difficult the processing becomes.

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

The present invention is directed to coil components comprising a wire and a terminal electrode having a connection 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 welded mass portion that rises from the reference surface.

In order to solve the above-mentioned technical problems, in the present invention, the terminal electrode further includes a protrusion for preventing the wire from warping from the terminal electrode, and the protrusion is provided with respect to the extending direction of the reference plane. It is characterized in that it is located outside the wire drawn out to the connection portion of the terminal electrode when viewed in the vertical direction, and protrudes from the connection portion of the terminal electrode in the extending direction of the reference plane.

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.

Further, in the present invention, preferably, the coil component further includes a cover portion for defining the upper limit of the floating of the wire from the reference plane, and the cover portion is in the direction perpendicular to the extending direction of the reference plane. As seen, it is positioned so as to cover at least a part of the wire, and the protrusion protrudes in the same direction as the cover portion.

More preferably, the terminal electrode has a rising portion extending substantially perpendicular to the direction in which the reference plane extends from the edge of the connecting portion, the cover portion is provided on the rising portion, and the protrusion is between the cover portion and the cover portion. It is located at a predetermined interval. If the cover portion is provided on the rising portion, it is easy to arrange the cover portion at a position that covers the wire.

The coil component according to the present invention includes a winding core portion in which a wire is spirally wound and a first and second flange portion provided at the opposite first and second end portions 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 protrusions are not caulked, it is possible to avoid disconnection of the wire due to the caulking process.

The structure of crimping the temporary fixing portion to temporarily fix the wire, as in the technique described in Patent Document 1 described above, requires fine bending in the manufacturing process in which the terminal electrode is attached to the core, and therefore the processing is performed. In the worst case, there is a risk that the terminal electrode will be peeled off from the core. However, in the present invention, since neither part of the terminal electrode is subject to caulking, problems such as complicated processing and peeling of the terminal electrode from the core due to caulking are avoided. be able to.

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

It is a perspective view which shows the appearance of the common mode choke coil 1 as a coil component by 1st Embodiment of this invention from the mounting surface side. It is a part of the common mode choke coil 1 shown in FIG. 1, and is an enlarged front view showing the configuration of the first flange portion 4 side provided in the core 2. It is a bottom view which shows a part of the structure of the flange part 4 side shown in FIG. 2 enlarged from the mounting surface side. It is a figure corresponding to FIG. 2, and shows the state before welding. It is an enlarged sectional view of the wire 23 provided in the common mode choke coil 1 shown in FIG. It is a figure which shows the photograph which took the electric connection part of the wire 23 and the terminal electrode 27 shown in FIG. It is for demonstrating the 2nd Embodiment of this invention, and is the figure corresponding to FIG. A perspective view showing one flange portion 71 which is a part of the core provided in the coil component described in Patent Document 1, a terminal electrode 72 arranged therein, and an end portion of a wire 73 connected to the terminal electrode 72. Indicates the state before welding. It is a figure corresponding to FIG. 8, and shows the state after welding.

In the description of the coil component according to the present invention, a common mode choke coil as an example of the coil component will be taken up. The common mode choke coil 1 as a coil component according to the 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 portion 2. The drum-shaped core 3 includes first and second flange portions 4 and 5, which are provided at the first and second end portions of the winding core portion 2 opposite to each other, respectively. Although not shown, the common mode choke coil 1 may further include a plate-like plate-like core passed 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 drum-shaped core 3 made of ferrite preferably has a Curie temperature of 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-shaped core 3 is preferably 1500 or less. According to this configuration, it is not necessary to use a special material for high magnetic permeability as the configuration or material of the drum-shaped core 3. Therefore, the degree of freedom in designing the drum-shaped core 3 is improved, and for example, the drum-shaped 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 in which the inductance value at a high temperature is secured and the temperature characteristics are good.

The Curie temperature of the above-mentioned plate-shaped core (not shown) is preferably 150 ° C. or higher, and the relative magnetic permeability is preferably 1500 ° C. or lower.

The flanges 4 and 5 are the inner end faces 7 and 8 facing the winding core 2 side and locating the respective ends of the winding core 2, and the outer end faces 9 facing the outer side opposite to the inner end faces 7 and 8, respectively. And 10 and. Further, the flange portions 4 and 5 have bottom surfaces 11 and 12 facing the mounting substrate (not shown) at the time of mounting, and top surfaces 13 and 14 on the opposite sides of the bottom surfaces 11 and 12, respectively. The above-mentioned plate-shaped core (not shown) is joined to the top surfaces 13 and 14 of the flange 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, and the second flange portion 4. Reference numeral 5 denotes 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, notch-shaped recesses 19 and 20 are provided at both ends of the bottom surface 11 of the first flange portion 4. Similarly, notch-shaped recesses 21 and 22 are provided at both ends of the bottom surface 12 of the second flange portion 5.

The common mode choke coil 1 further includes first and second wires 23 and 24 spirally wound around the core portion 2. Note that 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. Also in FIGS. 2 to 4, the drawings of the wires 23 and 24 on the winding core portion 2 are omitted. These wires 23 and 24 have a linear center conductor 25 and an insulating coating layer 26 that covers the peripheral surface of the center conductor 25, as shown in FIG. 5 for one wire 23.

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 an 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. Therefore, even at a high temperature of 150 ° C., the line capacitance does not change, and the Sdd11 characteristics can be made good. Further, it is possible to enhance the effectiveness of the effect that the noise suppression effect is excellent even at a high temperature of 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, even if the wires 23 and 24 are wound in two layers, one of which is on the inner layer side and the other of which is on the outer layer side, the wires 23 and 24 are alternately arranged in the axial direction of the winding core portion 2. It may be a bifilar winding that is wound in a state of being arranged parallel to each other.

The diameter D of the center 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 turns of the wires 23 and 24 around the core 2 can be increased, and the number of turns of the wires 23 and 24 can be kept unchanged. That is, the wire spacing can be widened without changing the wires 23 and 24 and the coil outer shape. Further, by reducing the ratio of the wires 23 and 24 to the outer shape of the coil, the dimensions of other parts such as the drum-shaped core 3 can be enlarged, so that the characteristics can be further improved.

Further, the diameter D of the central conductor 25 is preferably 28 μm or more. According to this configuration, it is possible to prevent the central conductor 25 from being disconnected.

Further, the thickness dimension 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 turns of the wires 23 and 24 around the core 2 can be increased, and the number of turns of the wires 23 and 24 can be kept unchanged. That is, the wire spacing can be widened without changing the wires 23 and 24 and the coil outer shape. Further, by reducing the ratio of the wires 23 and 24 to the outer shape of the coil, the dimensions of other parts such as the drum-shaped core 3 can be enlarged, 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 adjacent wires 23 and 24 can be increased in the wound state, so that the line capacitance is reduced, and therefore the Sdd11 characteristics 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 oriented in the direction in which the first and second side surfaces 15 and 16 of the first flange portion 4 face each other. They are arranged and attached to the first flange 4 via an adhesive. The second and fourth terminal electrodes 28 and 30 are arranged in the direction in which the first and second side surfaces 17 and 18 of the second flange portion 5 face each other, and the second flange portion 5 is provided with an adhesive. Can be attached.

The first end of the first wire 23 is electrically connected to the first terminal electrode 27, and the second end opposite to the first end of the first wire 23 is electrically connected to the second terminal electrode 28. Be 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 opposite to the first end of the second wire 24 is electrically connected to the fourth terminal electrode 30. Connected to.

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

The terminal electrode 27 is usually manufactured by subjecting a single metal plate made of a copper-based 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 flange portion 4, and a first bent portion 32 covering the ridgeline portion from the base portion 31 where the outer end surface 9 of the collar portion 4 and the bottom surface 11 intersect. A mounting portion 33 extending along the bottom surface 11 of the flange portion 4 is provided. When the common mode choke coil 1 is mounted on a mounting board (not shown), the mounting portion 33 is a portion that is electrically and mechanically connected to a conductive land on the mounting board 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 recess 19, and the connecting portion 37 extends along a bottom wall 39 defining the recess 19. The connection portion 37 is a portion along the end portion of the wire 23 and electrically and mechanically connects the wire 23 to the terminal electrode 27.

More specifically, the connection 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 that rises 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 on a portion other than the connecting portion 37, for example, a rising portion 35 extending substantially perpendicular to the extending direction of the reference surface 37b from the edge of the connecting portion 37. In this embodiment, the cover portion 40 extends from the rising portion 35 without being bent, and is formed in a protruding shape protruding from the rising portion 35.

As is well 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, it suffices if the cover 40 is capable of functioning to define an upper limit for the wire 23 to float from the reference plane 37b, and therefore, as seen in FIG. 3, the cover 40 is a reference plane. It does not have to overlap the connecting portion 37 when viewed in the direction perpendicular to the extending direction of 37b.

In this embodiment, a part of the wire 23 covered by the cover portion 40 has a circular cross section. Further, a part of the wire 23 covered by the cover portion 40 is not fixed. The cover portion 40 faces the wire 23 on only 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 ingot 43, and the reference surface 37b and the cover portion. The relationship with the distance H2 between 40 is preferably H2 <H1, and the distance H2 is preferably larger than the diameter of the wire 23.

According to 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 usually has a linear center conductor 25 and an insulating coating layer 26 covering the peripheral surface of the center conductor 25, but the diameter of the wire 23 is Refers to the diameter of the wire 23 at the portion covered by the cover portion 40. That is, the diameter of the wire 23 is the diameter (D + 2T) of the central 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, and the covering portion. When the wire 23 in the portion covered with 40 does not have the insulating coating layer 26, it is the diameter (D) of only the central conductor 25.

In the above configuration, as shown in FIG. 2, when the wire 23 is not in contact with either the cover portion 40 or the reference surface 37b, although not shown, the wire 23 is in contact with the cover portion 40 but is in contact with the reference surface. It may not be in contact with 37b.

Further, in this embodiment, as is well shown in FIG. 3, the connecting portion 37 of the terminal electrode 27 is provided with a protrusion 41 projecting in the same direction as the cover portion 40. The protrusion 41 is located outside the wire 23 that is pulled out to the connection portion 37 of the terminal electrode 27 when viewed in the direction perpendicular to the extending direction of the reference surface 37b, and is located outside the wire 23 when the wire 23 is wound. Prevents 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 connection 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 portion 40.

As is well shown in FIGS. 2 and 3, the connection portion 37 is preferably located at a predetermined distance from the collar portion 4. 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 defining the recess 19 and are not in contact with the vertical wall 38 and the bottom wall 39. Is preferable.

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 above-mentioned first terminal electrode 27. Reference numerals 31, 32, 33, 34, 35, 36, 37, 37a, 37b, 40, 41 and 43 used to refer to the welded ingots, respectively, are the second, third and fourth as necessary. Corresponding base part, first bent part, mounting part, second bent part, rising part, third bent part, connecting part, tip part, reference surface, cover part, protrusion in terminal electrodes 28, 29 and 30 of , And to refer to the weld block, respectively.

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

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

The number of turns of each of the first and second wires 23 and 24 on the winding core portion 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 characteristics 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 completing the winding step, the connecting steps of the wires 23 and 24 and the terminal electrodes 27 to 30 described below are carried out.

Hereinafter, a step of connecting the first wire 23 to the first terminal electrode 27 will be described 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 to the tip portion 37a of the connecting portion 37 as shown in FIG. Further, the end portion of the wire 23 is in a state in which the insulating coating layer 26 is removed all around the wire 23. For example, laser light irradiation is applied to remove the insulating coating layer 26.

Next, the laser beam 42 for welding is irradiated toward the region where the central conductor 25 exposed from the insulating coating layer 26 of the wire 23 and the tip portion 37a overlap. As a result, the central conductor 25 and the tip portion 37a receiving the central conductor 25 are melted. At this time, the molten central conductor 25 and the tip portion 37a become ball-shaped due to the surface tension acting on them, and the welded mass portion 43 is formed. That is, the weld block 43 is a combination of the center conductor 25 and the terminal electrode 27 (tip 37a), and the center conductor 25 is incorporated into the weld block 43.

Here, the central conductor 25 of the wire 23 tends to move toward the apex of the weld ingot 43, that is, the wire 23 tends to rise 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 likely to be 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 at the connection portion 37 of the terminal electrode 27 and the wire 23, and this resin expands and contracts. When repeated, the wire 23 is likely to be cut.

However, in this embodiment, since the cover portion 40 defines the upper limit of the floating of the wire 23 from the reference surface 37b at the connecting portion 37 of the terminal electrode 27, the wire 23 welded to the connecting portion 37 of the terminal electrode 27. Can be maintained in a state of being positioned along and close to the reference surface 37b. Therefore, high reliability can be realized with respect to the prevention of cutting of the wire 23 and the connection between the wire 23 and the connecting 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 miniaturized.

As described above, preferably, the connecting portion 37 is located at a predetermined distance from the flange portion 4 so as not to be in contact with the collar portion 4. This configuration is not essential, but according to this configuration, in the welding process described above, the temperature rise at the connecting portion 37 is less likely to be transmitted to the flange portion 4, and the adverse effect of heat on the drum-shaped core 3 is reduced. Can be done.

FIG. 6 shows a photograph of an electrical connection between a wire and a terminal electrode in an actual product of a common mode choke coil. The photograph of FIG. 6 is taken from an intermediate direction 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 welded mass portion 43. FIG. 6 shows a state in which the wire 23 is pulled out from the welded ingot portion 43 and the upper limit of the floating of the wire 23 from the reference surface 37b is defined by the cover portion 40.

By the welding process, not only the tip portion 37a of the connecting portion 37 but also the connecting portion 37 remaining after welding and the welded ingot portion 43 are welded to each other and are in contact with each other. The central conductor 25 of the wire 23 is included in the weld ingot 43. Further, since the insulating coating layer 26 is removed all around the end portion of the wire 23, the central conductor 25 of the wire 23 is also welded to the connecting portion 37 and the welded ingot portion 43 at the end portion of the wire 23. ing. Further, the material derived from the insulating coating layer 26 is not present in the welded mass portion 43. Regarding the distinction between the connecting portion 37 and the welded ingot portion 43, the portion in which the outer edge shape remains plate-shaped is referred to as the connecting portion 37, and the portion in which the outer edge shape is curved is referred to as the welded ingot portion 43. it can.

In this way, strong welding is achieved. Further, the central conductor 25 of the wire 23 is located between the connecting portion 37 and the welded ingot portion 43, and the entire circumference thereof is included in the welded ingot portion 43, so that the mechanical strength is higher and the electrical resistance is lower. Higher stress resistance, higher chemical corrosion resistance, etc. can be obtained, and higher reliability for the welded structure is realized. Further, since the substance derived from the insulating coating layer 26 does not exist in the weld mass portion 43, the blow hole at the time of melting can be reduced, and in this respect as well, a highly reliable welded structure can be obtained. ..

Although the connection between the first terminal electrode 27 and the first wire 23 has been described above, the same process is carried out for the connection between the other terminal electrodes 28 to 30 and the wire 23 or 24, and the same 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 sides of the first and second wires 23 and 24, respectively, opposite to the drawing side from the winding core portion 2. However, the second and third terminal electrodes 28 and 29 are located on the drawing side of the first and second wires 23 and 24 from the winding core portion 2, respectively. Here, the "drawing side of the first and second wires 23 and 24 from the winding core portion 2" means that the 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 where it is located.

In this case, the ends of the first and second wires 23 and 24 connected to the second and third terminal electrodes 28 and 29, respectively, 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, is a reference surface of the connecting portion 37 in the absence of the cover portion 40. It is easy to lift up from 37b, and it is difficult to position it along and close to the reference surface 37b. Therefore, the cover portion 40 is indispensable for the first and fourth terminal electrodes 27 and 30.

From the above, it can be said that it is sufficient that the cover portion 40 is provided at least on 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 drawing sides of the wires 23 and 24 from the winding core portion 2 are reversed, so this time, the second And the cover 40 must be provided on the third terminal electrodes 28 and 29. In this embodiment, in consideration of the above circumstances and the like, cover portions 40 are provided on all of the terminal electrodes 27 to 30 in order to enhance the versatility of the terminal electrodes 27 to 30.

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

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

As can be seen from this, the cover portion is not subject to caulking at the terminal electrode, can specify the upper limit of the wire floating from the reference plane of the connection portion, and extends the reference plane. It may be provided in any form as long as it satisfies the condition that it is located so as to cover a part of the wire when viewed in the direction perpendicular to the direction. Therefore, in 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 separate from the terminal electrode or the core to a specific portion of the terminal electrode or the core.

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

For example, the number of wires provided in the coil component, the winding direction of the wires, 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 for connecting the terminal electrode and the wire, but the present invention is not limited to this, and arc welding or the like may be used.

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

1 Common mode choke coil (coil parts)
2 Winding core 3 Drum-shaped core 4, 5 Collar 23, 24 Wire 27 to 30 Terminal electrode 35 Rising part 37 Connection part 37 b Reference surface 40, 40a Cover part 41 Protrusion 42 Laser light 43 Welded block part

Claims (4)

With wire,
A terminal electrode having a connection portion to which the end portion of the wire is electrically connected, and a terminal electrode.
With
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 welded mass portion that rises from the reference surface.
The terminal electrode further example Bei a projection for preventing the wire deflected from said terminal electrode,
The protrusion is located outside the wire drawn out to the connection portion of the terminal electrode when viewed in a direction perpendicular to the extending direction of the reference surface, and the reference surface is formed from the connection portion of the terminal electrode. Protruding in the extending direction of
Coil parts. Further provided with a cover portion for defining an upper limit of floating of the wire from the reference plane
The cover portion is positioned so as to cover at least a part of the wire when viewed in a direction perpendicular to the extending direction of the reference surface.
The protrusion protrudes in the same direction as the cover portion.
The coil component according to claim 1. The terminal electrode has a rising portion extending in a direction substantially perpendicular to the extending direction of the reference surface from the edge of the connecting portion, the cover portion is provided on the rising portion, and the protrusion is the cover portion. It is located at a predetermined interval between and
The coil component according to claim 2. Further comprising a core having a winding core in which the wire is spirally wound and first and second flanges provided at opposite first and second ends of the winding core, respectively. ,
The terminal electrodes are attached to the first and second flanges, respectively.
The coil component according to any one of claims 1 to 3.