JP3145245U - Coil parts - Google Patents

Abstract

An object of the present invention is to prevent disconnection of a conductive wire connected to a terminal.
A coil component includes a coil around which a conductive wire is wound, and a terminal electrode having a locking portion to which an end of the conductive wire is locked. And the latching | locking part 6a is provided with the plane part 13a in which a conductive wire is mounted, and the bending part 7a which fixes a conductive wire to the plane part 13a. A protrusion 14a that prevents flattening of the conductive wire fixed by the bent portion 7a is formed on at least one of the flat portion 13a or the bent portion 7a, and the end of the conductive wire fixed to the locking portion is the locking portion 6a. Diffusion bonded.
[Selection] Figure 2

Description

  The present invention relates to a coil component composed of, for example, a coil formed by winding a conductive wire and a terminal electrode to which an end of the conductive wire is locked.

  In recent years, weight reduction of automobiles has been regarded as important in order to improve power performance and environmental performance represented by reduction in fuel consumption. Accordingly, the same weight reduction is required for each of the devices and parts mounted on the automobile. In addition, automobiles are being digitized to realize various functions. For this reason, it is necessary to suppress the increase of the vehicle weight accompanying computerization as much as possible.

  Here, ABS (Antilock braking system) is mentioned as an example of the function which an automobile carries. ABS is a system capable of sudden braking without locking tires in order to ensure steering performance such as emergency avoidance. In recent years, automobiles equipped with ABS have become widespread.

  In the ABS, a coil component is used in order to operate a hydraulic valve that pressurizes and depressurizes brake oil. Further, many coil parts (a total of 8 to 12 ABS coils are usually used for one automobile) are often installed in the engine room of the automobile. For this reason, the coil parts must ensure reliability that can sufficiently withstand harsh usage environments such as temperature, humidity, and vibration. At the same time, the requirement to reduce the weight of coil parts must be satisfied.

Patent Document 1 discloses a coil component that uses aluminum as a main material of a conductive wire connected to a terminal to reduce weight.
Utility Model Registration No. 3140817

  By the way, when the conductive wire disclosed in Patent Document 1 is sandwiched between the bent portions, the conductive wire may be crushed and the cross-sectional shape may be deformed. Here, a state before and after diffusion bonding of the conductive wire 100 sandwiched between the bent portions 101 (corresponding to the locking pieces described in Patent Document 1) will be described with reference to FIG.

FIG. 9A shows an example of the conductive wire 100 before diffusion bonding.
The bent portion 101 is a single blade-shaped portion formed on the flat portion 102. The conductive wire 100 placed on the flat surface portion 102 is fixed by bending the bent portion 101. The conductive wire 100 is a member whose main material (core material) is formed of aluminum, and when the bent portion 101 is bent, the conductive wire 100 is easily pressurized and deformed. For this reason, the contact area of the bending part 101 and the plane part 102, and the conductive wire 100 will become large.

FIG. 9B shows an example of the conductive wire 100 after diffusion bonding.
When the conductive wire 100 is diffusion bonded in a state where the contact area between the bent portion 101 and the flat surface portion 102 and the conductive wire 100 is large, a large amount of current flows through the conductive wire 100 and the temperature of the conductive wire 100 tends to increase. The melting point (660 ° C.) of aluminum used for the core part of the conductive wire 100 is lower than the melting point (about 1080 ° C.) of copper coated on the core part. For this reason, when diffusion bonding is performed, the core portion of the conductive wire 100 easily reaches the melting point. As a result, the core portion is flattened or the cross-sectional area of the conductive wire 100 is reduced, so that it is easy to melt.

  The present invention has been made in view of the above problems, and an object thereof is to prevent disconnection of a conductive wire connected to a terminal.

  The present invention relates to a coil component including a coil in which a conductive wire is wound and a terminal electrode having a locking portion on which an end of the conductive wire is locked. And a bent portion for fixing the conductive wire to the flat portion, and a protrusion for preventing flattening of the conductive wire fixed by the bent portion is formed on at least one of the flat portion or the bent portion, This is a coil component in which the end portion of the conductive wire fixed to the locking portion is diffusion bonded to the locking portion.

  According to the present invention, the end portion of the conductive wire is formed by forming the protrusion portion that prevents the conductive wire fixed by the bent portion on the flat surface portion provided in the engaging portion to which the end portion of the conductive wire is fixed. Prevents excessive flattening. Moreover, since the electric current that flows when performing diffusion bonding is appropriately diverted between the bent portion, the conductive wire, and the protruding portion, the conductive wire is not heated excessively, and fusing can be suppressed. For this reason, there exists an effect that the latching | locking part of a terminal electrode and the edge part of a conductive wire can be connected reliably.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. This embodiment will be described as an example applied to a coil component 1 (ABS coil) employed in, for example, an automobile ABS system.

First, a configuration example of the coil component 1 will be described with reference to FIG.
FIG. 1A is a perspective view of the coil component 1.
FIG. 1B is a perspective view of the coil component 1 with the winding coil 5 removed.
FIG. 1C is a perspective view of the coil component 1 in a state where the terminal electrodes 4a and 4b are removed from the terminal electrode fixing portion 3d.

  The coil component 1 includes a bobbin 2 molded with resin, a winding coil 5 in which a conductive wire covered with an insulating resin film is spirally wound around the bobbin 2 a predetermined number of times, and both ends of the conductive wire Are constituted by two terminal electrodes 4a and 4b to which are connected. The bobbin 2 has a cylindrical shape, and a through hole 9 having a predetermined radius is formed at the center of the cylinder axis. An iron core, a plunger, etc. (not shown) are installed in the through hole 9.

  Collar portions 3a and 3b are formed at both ends of the bobbin 2 so that the wound conductive wire does not loosen. The radius of the collar portions 3 a and 3 b is larger than the radius around which the winding coil 5 is wound around the bobbin 2.

  A terminal electrode fixing portion 3d for implanting the terminal electrodes 4a and 4b is formed on the collar portion 3a. The terminal electrode fixing part 3d is a part formed by protruding a part of the collar part 3a. By forming the terminal electrode fixing portion 3d in this manner, a sufficient depth is secured when the terminal electrodes 4a and 4b are implanted, and the fixing strength is increased. And the notch part 3c which notched a part of the collar part 3a is formed in the collar part 3a. The notch 3c serves as a guide groove when connecting the conductive wire ends 12a and 12b to the terminal electrodes 4a and 4b, and suitably maintains the arrangement position of the conductive wire ends 12a and 12b.

Here, the peripheral part of the terminal electrode fixing part 3d is defined as an enlarged area 10, and the enlarged area 10 will be described.
Each terminal electrode 4a, 4b is formed with one-wing shaped bent portions 7a, 7b for electrically and mechanically fixing the conductive wire. The bent portions 7a and 7b are part of flat portions 13a and 13b (see FIGS. 1B and 1C) formed integrally with the terminal electrodes 4a and 4b, and the conductive wire end portions 12a and 12b along the notch portion 3c. 12b is in contact with the respective terminal electrodes 4a and 4b. The conductive wire end portions 12a and 12b are held and fixed by sandwiching the bent portions 7a and 7b. In this way, the flat portions 13a and 13b on which the conductive wire end portions 12a and 12b are placed and the bent portions 7a and 7b that are bent and fix the conductive wires are referred to as locking portions 6a and 6b.

The locking portions 6a and 6b enhance the reliability of the mechanical / electrical connection by subjecting the conductive wire and the bent portions 7a and 7b to diffusion bonding.
Diffusion bonding refers to the use of atomic diffusion that occurs between the bonding surfaces of the base material by bringing the base material into close contact and applying pressure to the extent that plastic deformation does not occur as much as possible under temperature conditions below the melting point of the member to be joined. This is a technique for joining base materials. At the time of diffusion bonding, positive and negative electrodes are applied to the engaging portions 6a and 6b sandwiching the conductive wire end portions 12a and 12b, respectively, and a voltage is applied. The locking portions 6a and 6b are plated with tin or copper. For this reason, when diffusion bonding is performed, the atoms of the respective members in the vicinity of the interfaces between the respective conductive wire end portions 12a and 12b and the locking portions 6a and 6b are diffused and firmly bonded.

  Projections 14a and 14b are formed on the flat portions 13a and 13b in this example by press working using a press. Since the projections 14a and 14b limit the bending of the bent portions 7a and 7b, the conductive wire end portions 12a and 12b are fixed to the locking portions 6a and 6b without being excessively flattened.

  The terminal electrodes 4a and 4b are formed with fixing portions 8a and 8b for fixing to the terminal electrode fixing portion 3d. Terminal electrode press-fitting holes 10a and 10b for fixing the terminal electrodes 4a and 4b are formed in the terminal electrode fixing portion 3d. The terminal electrode press-fitting holes 10a and 10b are holes that match the cross-sectional shape of the fixing portions 8a and 8b.

FIG. 2 shows an example of the locking portion 6a in an enlarged view.
FIG. 2A shows the locking portion 6a before forming the protruding portion 14a.
FIG. 2B shows the locking portion 6a after forming the protruding portion 14a.
In addition, in the following description, since the latching | locking part 6b is comprised similarly to the latching | locking part 6a, detailed description of the latching | locking part 6b is abbreviate | omitted.

  The bent portion 7a is a member in which a metal flat portion 13a has a single blade shape. As for the latching | locking part 6a of this example, the projection part 14a is formed in the plane part 13a. The conductive wire end portion 12a extends along a portion where the bent portion 7a is bent and the protruding portion 14a. The conductive wire end portion 12a is temporarily fixed without dropping from the flat portion 13a by bending the bent portion 7a with respect to the flat portion 13a by approximately 180 degrees.

  Next, an example of a state in which the locking portion 6a described in FIG. 1 is viewed in cross section along the line I-I ′ will be described with reference to FIG. 3.

FIG. 3 shows an example of a state in which the conductive wire end portion 12a is diffusion bonded to the flat portion 13a on which the protruding portion 14a is formed.
In this example, after forming the protrusion part 14a in the plane part 13a, the conductive wire end part 12a is sandwiched between the plane part 13a and the bent part 7a. At this time, since the protrusion 14a restricts the bent portion 7a from being excessively bent, the conductive wire end portion 12a can be prevented from being flattened excessively.

  Next, an example of a state in which the locking portion 6a described in FIG. 1 is viewed in cross section along the line I-I ′ will be described with reference to FIG. 4.

FIG. 4A is an enlarged view of a state where the conductive wire end portion 12a disposed in the locking portion 6a is fixedly held.
The conductive wire end portion 12a is held and fixed by the flat surface portion 13a and a bent portion 7a bent at about 180 °. The locking portion 6a and the conductive wire end portion 12a are connected (bonded) by diffusion bonding.

  Here, let L1 be the length of contact between the flat surface portion 13a and the conductive wire end portion 12a. Similarly, the contact length at which the bent portion 7a and the conductive wire end portion 12a contact each other is L1 ′. As is clear from FIG. 4A, the conductive wire end 12a and the locking portion 6a are connected so that the contact length (L1 + L1 ′) is larger than 50% of the outer peripheral length of the conductive wire end 12a. ing.

FIG. 4B is an enlarged view of a state in which the conductive wire end 12a is fixedly held by the curved portion of the locking portion 6a.
In this state, the contact length at which the conductive wire end portion 12a and the engaging portion 6a (the flat portion 13a and a part of the bent portion 7a) contact is L2. At this time, the contact length L2 is larger than 50% of the outer peripheral length of the conductive wire end portion 12a.

  In the present invention, the conductive wire end 12a is fixed so that the contact lengths (L1 + L1 ′) and L2 are longer than 50% of the outer peripheral length of the conductive wire end 12a. For this reason, the contact area of the conductive wire end portion 12a and the locking portion 6a can be increased, and the contact strength between them can be increased. As a result, even when an external force is applied to the part, it is possible to prevent a problem that the conductive wire end portion 12a is detached from the locking portion 6a. Further, since the contact area between the conductive wire end portion 12a and the locking portion 6a is increased, the contact resistance at the contact portion can be reduced.

  The conductive wire of this example is characterized in that copper is coated around an aluminum wire whose core material is aluminum. The reason why aluminum is used for the core material is to reduce the weight of the coil component 1. The reason why the core material is coated with copper is to increase the tensile strength of the conductive wire itself while obtaining excellent electrical conduction.

  Here, an example in which a cross section of a conventional wire and a conductive wire in this embodiment is compared will be described with reference to FIGS.

FIG. 5A is an example of a cross-sectional view of a general conductive wire conventionally used.
A covering portion 22 is formed on the outer peripheral surface of the core material 21. The material of the core material 21 is copper. The material of the covering portion 22 is an insulating resin.

Conventionally, copper (Cu) has been used as a main material for conductive wires used in coil components (hereinafter, conventional conductive wires are also referred to as copper wires). The biggest reason for using copper for the conductive wire is that copper has good electrical conductivity and can be obtained relatively inexpensively. However, copper has a relatively high density of about 8.90 g / cm ³ . For this reason, when a large number of ABS coils are used in one automobile, the weight of the automobile increases.

FIG. 5B is an example of a cross-sectional view of the conductive wire in the present embodiment.
The conductive wire of this example includes a core member 15, a covering portion 16 covered on the outer peripheral surface of the core member 15, and a covering portion 17 covered on the outer peripheral surface of the covering portion 16. The material of the core material 15 is aluminum. The material of the covering portion 16 is copper. The material of the covering portion 17 is a polyamideimide resin. The conductive wire of this example can be reduced in weight as compared with the conventional conductive wire because the core material 15 having the largest contribution of weight is made of aluminum.

Next, an example of the characteristics of each conductive wire will be described with reference to FIG.
FIG. 6A shows an example of characteristics when the conductive wires are aluminum wires, copper wires, and copper clad aluminum wires (conductive wires according to the present invention), respectively.
From this result, it is shown that the specific gravity of the conductive wire of this example is lower than that of the copper wire. For this reason, the conductive wire of this example is about 60% lighter than a copper wire of the same length.

Further, as a comparison between the core material 15 and the copper coated around the core material 15, for example, when the wire diameter of the conductive wire (excluding the insulating coating) is 1 mm, the diameter of the core material 15 is 0.8 to 0.00 mm. It is desirable to satisfy the relationship of 9 mm and a copper coating thickness of 0.1 to 0.05 mm. The ratio of the diameter of the aluminum core material to the coating thickness of the copper coated on the core material is formed so as to satisfy the relationship of the following formula (1). In addition, let the width | variety of the core material 15 and the coating | coated part 16 shown to FIG. 5B be the variables A and B, respectively.
Aluminum: Copper = A: B (1)
(0.8 ≦ A ≦ 0.9, 0.05 ≦ B ≦ 0.1, A + 2 × B = 1.0)

  Here, as a comparison condition, consider a case where aluminum is smaller than 0.8 mm and copper is larger than 0.05 mm. In this case, the weight of the coil component is increased, and a large amount of copper is used, which increases the cost of the conductive wire.

  On the other hand, when the aluminum of the conductive wire is larger than 0.9 mm and the copper is smaller than 0.05 mm, the electrical conductivity is lowered and the tensile strength of the conductive wire is lowered. Furthermore, since the amount of copper used is small, the connection strength between the locking portion and the conductive wire end portion is lowered, and the conductivity is also increased.

  Conventionally used copper, which is the main material of the conductive wire, has a specific gravity of about 8.89. On the other hand, the specific gravity of aluminum, which is the main material of the conductive wire employed in the present invention, is about 2.70, and the specific gravity is about 1/3 compared to copper. Therefore, the weight of the coil component 1 can be remarkably reduced. In addition, the weight of an automobile equipped with a plurality of coil components as an ABS coil can also be reduced. For this reason, compared with the case where the conventional conductive wire is used, the motive power performance and environmental performance of an automobile become advantageous.

  Here, the inventor of the present invention experimented by making a trial manufacture of the coil component 1. In this experiment, a conductive wire according to the present invention and a copper wire are wound 515 turns to prepare five samples each. And the weight of five samples is measured for every conductive wire, and an average weight is calculated | required. As a result, as shown in FIG. 6B, the weight of the coil component using the conductive wire according to the present invention is about 5 g, which is about half the weight of the coil component using the copper wire (about 11 g). It was. Generally, since a total of 8 to 12 ABS coils are used for one automobile, it is shown that reducing the weight of each coil leads to a significant reduction in the weight of the entire ABS unit.

Next, an example of resistance welding and diffusion bonding will be described with reference to FIG.
Both resistance welding and diffusion bonding are techniques for heating and bonding by applying a voltage by pressing a heating electrode at a desired site.

  Conventionally, the end portion of the conductive wire and the terminal electrode are joined by being immersed in molten solder. However, coil parts for automobiles are constantly subjected to vibrations, impacts, and the like that are generated when the automobile is running, and there has been a risk of problems such as cracks and solder peeling in solder joints. In addition, the so-called “copper erosion phenomenon” in which the Cu component of the conductive wire elutes in the molten solder is likely to occur, and the conductive wire is thinned and easily breaks. For this reason, the end portion of the conductive wire and the terminal electrode may be joined by resistance welding.

FIG. 7A is an example of resistance welding.
In resistance welding, the bent portion 7a is bent, the conductive wire end portion 33 made of copper as the main material is sandwiched, and the current 31 is supplied by energizing the positive and negative electrodes. At this time, the melted portion 32 of the conductive wire end portion 33 becomes a wide range. In the case of resistance welding, in order to join the conductive wire end portion 33 and the locking portion 6a, the temperature of the joining portion must be raised to the melting point of copper (about 1080 ° C.) or more. For this reason, it is necessary to increase the voltage applied to the positive and negative electrodes, and there has been concern about an increase in process time / an increase in cost. In addition, even if it is attempted to heat up to a predetermined temperature for performing welding, it is necessary to increase the voltage because the resistance of copper is small. However, if the voltage is increased, the entire locking portion is heated and the copper is easily melted, so The diameter of the wire end portion 33 sometimes became thin. For this reason, a technique of joining the end portion of the conductive wire and the terminal electrode by diffusion bonding has been used.

FIG. 7B is an example of diffusion bonding.
Diffusion bonding is a technique in which a base material is brought into close contact, is pressed to such a degree that plastic deformation does not occur under temperature conditions below the melting point of the base material, and is joined using diffusion of atoms generated between the joint surfaces. For this reason, the joining part 42 joined by the current 41 flowing is limited to the interface between the conductive wire 12a and the locking portion 6a, and an excessive temperature rise of the core material can be suppressed low. The bonding condition in the diffusion bonding may be approximately 750 ° C. or higher, and a temperature range that does not reach the melting point of copper (about 1080 ° C.) is preferable. The reason for this temperature is to activate atomic diffusion at the interface between the copper coating layer of the conductive wire and the terminal electrode to ensure bonding. In addition, since this bonding temperature is about 200 ° C. lower than the melting point of copper (about 1080 ° C.), the voltage applied at the time of bonding can be lowered and the manufacturing cost / time can be reduced compared to resistance welding. It becomes.

  Further, when the positive and negative electrodes are energized, current is diverted to the protruding portions 14a, the conductive wire end portions 12a, and the bent portions of the bent portions 7a. For this reason, the current density is made uniform, the conductive wire end portion 12a does not generate excessive heat, and the core portion of the conductive wire end portion 12a is not melted and may not be disconnected.

  According to the present embodiment described above, since the protrusion is formed on the flat portion by pressing, excessive pressure is not applied to the end portion of the conductive wire fixed to the flat portion by the bent portion. For this reason, excessive flattening of the conductive wire end can be prevented. And since a large local current does not flow to the conductive wire end during diffusion bonding, the temperature rise in the core is suppressed, and the aluminum in the core does not melt. As a result, it is possible to reliably join the end portions of the conductive wires fixed to the locking portions, and there is an effect that the reliability of the coil component 1 is improved.

  Moreover, since each bending part is integrally formed in a plane part, manufacture is easy. Further, the bent portion holds and fixes the end portion of the conductive wire so as to face the flat portion with the conductive wire end portion interposed therebetween. For this reason, the position shift of the conductive wire in the pre-bonding process can be suppressed, and there is an effect that the bonding process is stabilized.

  Moreover, the weight of the coil component 1 can be reduced by using aluminum (Al) as the main material of the conductive wire. For this reason, even if it uses many coil components 1, the increase in the whole weight is suppressed. In addition, by covering copper around the core material, it is possible to increase the tensile strength of the conductive wire while maintaining excellent electrical conduction. For this reason, it is possible to ensure the reliability of the coil component that can sufficiently withstand a severe use environment such as temperature, humidity, and vibration.

  The terminal electrode locking portion and the conductive wire end portion are diffusion-bonded in a temperature range of approximately 750 ° C. or more and the melting point of copper or less. For this reason, compared with the case of the resistance welding which joins a copper wire near melting | fusing point, a conductive wire and a latching | locking part can be connected at low temperature. Moreover, the latching | locking part excellent in connection strength is obtained compared with the construction method immersed in the molten solder employ | adopted at the time of manufacture of the conventional coil components. Therefore, it is possible to simplify the manufacturing process and reduce the cost. Also, for example, when this coil component is attached to an automobile, the connection between the terminal electrode locking portion of the terminal coil component and the end portion of the conductive wire can be reliably maintained even when subjected to vibration generated during the running of the automobile. Is possible.

  Further, the contact length where the engaging portion of each terminal electrode comes into contact with the outer periphery of the end portion of the conductive wire is held and fixed in a state where it is larger than 50% of the outer periphery of the end portion of the conductive wire. At this time, since the terminal electrode has a bent portion, it is easy to hold and fix the end portion of the conductive wire in an opposed state. Further, since the interface for diffusion bonding is widened, there is an effect that the bonding strength is increased.

  Moreover, since the temperature resistance of the coil component 1 is increased by using a polyamideimide resin as the covering portion 17, it is suitable when the coil component 1 is used in a high temperature environment. Moreover, since the polyamide-imide resin is a material having excellent insulating characteristics, current leakage does not occur.

  In the description of the above-described embodiment, the description has been made as an example applied to an automobile ABS coil, but the application is not limited to an automobile ABS coil. Needless to say, the coil component according to the present invention can be suitably used in other applications (such as home appliances and industrial electronic devices).

  Moreover, although the polyamideimide resin is used as the insulating resin film on the outer peripheral surface of the conductive wire of the present invention, the temperature condition at the time of diffusion bonding is optimally set in the range of approximately 750 ° C. or more and the melting point of copper or less. Has been. For this reason, the conductive wire end can be joined to the locking portion while removing the resin film while applying a voltage. Furthermore, since the temperature at the time of joining is low, the degree of influence related to the thermal deterioration of the bobbin 2 can be reduced, and thus the highly reliable coil component 1 can be obtained.

  In addition, the fixing position of the conductive wire is not particularly limited as long as the locking portion and the conductive wire end are in contact with each other at 50% or more of the outer peripheral length of the conductive wire. Furthermore, since a favorable joining state can be ensured, there is an effect that the reliability of the coil component is improved.

  In the above-described embodiment, the protrusion 14a is formed on the flat surface portion 13a. However, the protrusion may be formed on the bent portion 7a by pressing or bending. Moreover, you may form a projection part in both the plane part 13a and the bending part 7a. In the embodiment described above, only one protrusion 14a is formed on the flat surface portion 13a. However, two or more protrusions may be formed.

Here, the example of the latching | locking part in the other embodiment of this invention is demonstrated with reference to FIG.
FIG. 8A shows the flat surface portion 13a in which the protruding portions 51a are formed by press working.
FIG. 8B shows an example of a state viewed in section along the line JJ ′ in FIG. 8A. Here, the locking portion 6a ′ where the bent portion 7a is bent will be described.
The locking portion 6a ′ is a member that constitutes the coil component 1 in the same manner as the locking portion 6a in the above-described embodiment. Moreover, although the member corresponding to the latching | locking part 6b is comprised similarly to the latching | locking part 6a ', detailed description about this member is abbreviate | omitted.

  The protrusion 51a is linearly formed on the edge side of the flat portion 13a. After the conductive wire end portion 12a is placed on the flat surface portion 13a, when the bent portion 7a is bent, the conductive wire end portion 12a is fixed so as not to be disengaged from the locking portion 6a '. When the positive and negative electrodes in contact with the locking portion 6a 'are energized, the locking portion 6a' and the conductive wire end 12a can be diffusion bonded. Thus, even if it changes the shape of the projection part 51a, the conductive wire end part 12a can be connected suitably. In the present embodiment, it is also possible to form a tongue piece on the opposite side of the bent portion 7a across the flat surface portion 13a, and to bend the tongue piece into the protruding portion 51a.

A, B, C It is the block diagram which showed the example of the coil components in one embodiment of this invention. A and B It is the block diagram which showed the example of the latching | locking part in one embodiment of this invention. It is the block diagram which showed the example of the latching | locking part in one embodiment of this invention. A and B It is explanatory drawing which showed the example of the state which fixed the winding coil to the latching | locking part in one embodiment of this invention. A, B It is explanatory drawing which showed the example which compares the cross section of the conventional electrically conductive wire and the electrically conductive wire in one embodiment of this invention. It is explanatory drawing which showed the example of the characteristic of A and B each electrically conductive wire. It is explanatory drawing which showed the example of A and B resistance welding and diffusion bonding. A and B It is the block diagram which showed the example of the latching | locking part in the other embodiment of this invention. It is the block diagram which showed the example of a connection of the electrically conductive wire fixed to the conventional latching | locking part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Coil component, 2 ... Bobbin, 3a, 3b ... Collar part, 3c ... Notch part, 3d ... Terminal electrode fixing part, 4a, 4b ... Terminal electrode, 5 ... Winding coil, 6a, 6b ... Locking part, 7a, 7b ... bent portion, 8a, 8b ... fixed portion, 9 ... through hole, 10 ... enlarged region, 12a, 12b ... conductive wire end, 14a, 14b ... projection

Claims (3)

In a coil component comprising: a coil formed by winding a conductive wire; and a terminal electrode having a locking portion where an end of the conductive wire is locked.
The locking portion is
A plane portion on which the conductive wire is placed;
A bending portion for fixing the conductive wire to the plane portion,
A protrusion for preventing flattening of the conductive wire fixed by the bent portion is formed on at least one of the flat portion or the bent portion,
A coil component in which an end portion of the conductive wire fixed to the locking portion is diffusion bonded to the locking portion. The coil component according to claim 1,
The conductive wire consists of a core material and a covering part,
The core material is aluminum,
The said coating | coated part is copper components coat | covered with the said core material. In the coil component according to claim 1 or 2,
The protrusion is formed by pressing the flat portion or the bent portion.