JP2010033790A - Electronic component and method of manufacturing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic component improving connection reliability of a weld part for connecting a conductor part to a terminal part. <P>SOLUTION: The electronic component comprises a body part 7; a coated conductor 8 comprising a conductor wiring part 9 wired to the body part 7, and a conductor end 11 provided at the end of the conductor wiring part 9; a terminal part 12 inserted in the body part 7; and the weld part 13 connecting the conductor end 11 to the terminal part 12. At least a part of the conductor end 11 is provided with a plurality of groove parts 14 in a circumferential direction with an extended direction of the conductor end 11 as an axis. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic component used in various electronic devices and an electronic component manufacturing method.

  A conventional electronic component and a manufacturing method thereof will be described below with reference to the drawings.

  FIG. 12 is a perspective view of a terminal welding portion of a conventional electronic component, in which a conductor 3 is joined to a terminal portion 2 implanted in the main body portion 1 by a welding portion 4.

  As a welding method, as shown in the cross-sectional view of FIG. 13, the conductor 3 is brought into close contact with the terminal portion 2 implanted in the main body 1, and the welded portion 4 is formed therewith by soldering, for example, or the terminal portion. The welded portion 4 is used for flowing a current between the terminal portion 2 and the conductor 3 and melting a part of the terminal portion 2 and the conductor 3 by heat generated by the contact resistance existing in the contact portion 5 between the terminal portion 2 and the conductor 3. Was formed.

For example, Patent Document 1 is known as prior art document information relating to the invention of this application.
JP 2007-073874 A

  However, in the conventional electronic component, when the welded portion 4 in FIG. 12 is a small region or a small amount, the connection between the terminal portion 2 and the conductor 3 is sufficiently reliable in terms of electrical and mechanical strength. There was a possibility that it might not be possible to obtain.

  For example, when the area of the welded portion 4 is enlarged and the amount thereof is stabilized, stable electric power can be obtained unless sufficient dimensions are given to the width W of the terminal portion 2 and the length L of the joint portion 4. Connection and maintenance of mechanical strength becomes difficult.

  That is, the welded part 4 has a problem that requires strict management for maintaining the dimensions of the terminal part 2 and a sufficient welding amount in order to maintain the connection reliability.

  On the other hand, in the formation method of the welded part 4, for example, when performing resistance welding using the contact resistance existing in the contact part 5 between the terminal part 2 and the conductor 3 shown in FIG. If the contact portion 5 is made too long in order to maintain the resistance, the contact surface becomes large and the contact resistance is lowered, so that a power source with high ability is required to supply a very large current. There are problems that it is difficult to form the welded portion 4 at the target position because the position where the contact resistance is likely to be generated changes depending on the state of the contact portion 5 and the position where the contact resistance easily occurs.

  That is, the welding part 4 in FIG. 12 has a larger problem at the time of formation when priority is given to the solution of the problem in the shape, or the problem of the shape is increased when priority is given to the solution of the problem at the time of formation. There were conflicting issues.

  Therefore, the present invention provides an electronic component having improved connection reliability between a conductor portion and a terminal portion, and a method for manufacturing the same.

And to achieve this goal,
The main body,
A conductor portion comprising a conductor wiring portion wired to the main body portion and a conductor end portion provided at an end portion of the conductor wiring portion;
A terminal portion implanted in the main body portion;
A welding portion connecting the conductor end portion and the terminal portion;
At least a part of the conductor end portion is provided with a plurality of groove portions in the outer peripheral direction with the extending direction of the conductor end portion as an axis.

  According to the present invention, it is possible to ensure an accurate joining state regardless of the area and the amount of the welded portion, and at the same time, it is possible to always stably form the joined portion. It is.

  Hereinafter, an electronic component according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view of an electronic component according to an embodiment of the present invention. Here, a coil component 6 will be described as an example. The coil component 6 includes a terminal portion 12 that joins a conductor wiring portion 9 in which a covering conductor 8 is wound around a main body portion 7 and a conductor end portion 11 that is provided at an end portion of the covering conductor 8 and is peeled and removed. The main structure.

  Here, the joint portion 13 between the conductor end portion 11 and the terminal portion 12 energizes a large current between the conductor end portion 11 and the terminal portion 12 and exists at the contact portion between the conductor end portion 11 and the terminal portion 12. It is formed by welding such as resistance welding by heat generated in contact resistance. Further, a plurality of groove portions 14 are provided in a part of the conductor end portion 11 in the circumferential direction about the direction in which the conductor end portion 11 is extended.

  According to this configuration, since the contact area between the joint portion 13 and the conductor end portion 11 is increased by providing the groove portion 14 in the conductor end portion 11, the joint portion 13 between the conductor end portion 11 and the terminal portion 12 is formed. The resistance value can be reduced. This is a cross-sectional view of the groove portion 14 and a cross-sectional view of a portion that is not the groove portion 14, as shown in FIGS. 2 (a) and 2 (b), the circumferential direction of the conductor end portion 11 located above the terminal portion 12. 1 is increased in the groove 14 shown in FIG. 1, and the contact area is naturally increased.

  At the same time, the amount of wraparound of the joint portion 13 shown in FIG. 2A is increased, so that the fixing force of the conductor end portion 11 to the terminal portion 12 is also increased. Therefore, even when the amount of the joining member including the metal corresponding to the joining portion 13 is small, it is possible to improve the reliability with respect to electrical joining and mechanical strength. Naturally, the application range can be enlarged also in the quantitative management of the joining member applied to the joining part 13 in mass production.

  Here, in FIG. 1, the groove portion 14 is provided over the entire circumference of the conductor end portion 11, but as shown in FIG. 2A, from the viewpoint of placing importance on the amount of wraparound of the joint portion 13. It is possible to obtain a sufficient effect by providing the groove portion 14 shown in 1 on the side surface portion of the conductor end portion 11.

  Furthermore, in terms of the fixing force of the conductor end portion 11 to the terminal portion 12, as shown in the sectional view of FIG. 3, the joint portion 13 located in the groove portion 14 has a wedge function, and the direction of the arrow in the figure. The fixing force can be increased even with respect to the force applied to A, for example, the expansion / contraction force due to the temperature change of the conductor end 11 or the like. Alternatively, it is possible to further increase the above-described effect of fixing by making the depth of the groove portion 14 different and providing at least one deeper groove portion 14. Here, when the groove portion 14 is deepened, the cross-sectional area in the arrow direction A in the figure is reduced at that portion, so that the DC resistance in the extending direction of the conductor end portion 11 is increased, but the joint portion 13 exists in the groove portion 14. By doing so, there is no particular problem with respect to DC resistance.

  If the conductor end 11 shown in FIGS. 2 (a) and 2 (b) is directly welded to the base layer 16, the joint 13 shown in FIG. It will not have the function of. However, even in that case, the conductor end portion 11 and the terminal portion 12 are formed by alloying the substantially similar metals by welding the conductor end portion 11 and the base layer 16 shown in FIGS. 2 (a) and 2 (b). The mechanical fixing force and the electrical connection are very strong.

  On the other hand, as shown in FIG. 2A, the terminal portion 12 preferably uses, for example, iron or an iron alloy as the base material 15, copper or a copper alloy as the base layer 16, and tin or a tin alloy as the outer layer 17. By adopting the configuration of the terminal portion 12 described above, it is possible to obtain sufficient mechanical strength of the terminal portion 12, but it is easy to join by arranging a metal having a relatively low melting point temperature in the outer layer 17. It is possible to form the portion 13. Further, welding may be performed at a higher temperature, and the conductor end portion 11 may be directly welded to the base layer 16 or the base material 15 to form the welded portion 13 of those alloys.

  As described above, the coil component 6 has been exemplified here as shown in FIG. 1, and this is a device having an especially important component of the coated conductor 8 that is extremely long and frequently meandered during wiring. Therefore, it is a representative example because of its large effect. Therefore, the present invention can be applied to a capacitive device (not shown), a resistor (not shown), or a composite device thereof, and any device that joins the conductor end 11 to the terminal portion 12 can be used. Applicable to devices.

(Embodiment 2)
Next, a manufacturing method for the above-described electronic component, particularly a welding method will be described with reference to the drawings. Here again, the coil component 6 shown in FIG. 1 will be described as an example. The coil component 6 includes a terminal portion 12 that joins a conductor wiring portion 9 in which a covering conductor 8 is wound around a main body portion 7 and a conductor end portion 11 that is provided at an end portion of the covering conductor 8 and is peeled and removed. The main structure.

  The method for manufacturing the coil component 6 is roughly divided into three steps, a first step for removing the covering portion 10 and a second step for contacting and pressing the conductor end portion 11 against the terminal portion 12. And the third step of welding the conductor end portion 11 and the terminal portion.

  First, as a first step, as shown in FIG. 4, the covering portion 10 of the covering conductor 8 is removed by a cutting tool 18. At this time, the biting amount of the cutting tool 18 into the covered conductor 8 is set to a value larger than the thickness of the covering portion 10, and the groove portion 14 is formed on the surface of the conductor portion 19 simultaneously with the removal of the covering portion 10.

  In FIG. 4, the covering portion 10 is removed while the cutting tool 10 is moved in the axial direction of the covering conductor 8 with respect to the rotating covering conductor 8, and the spiral portion 18 is simultaneously spiraled. The method of forming the groove part 14 connected to one by the shape is shown. Alternatively, as shown in FIG. 5, the second cutting tool 20 has a width that allows the plurality of groove portions 14 to be formed by one turn of the covered conductor 8. In some cases, the region where the covering portion 10 is removed is determined by using a plurality of times or by using a plurality of the second cutting tools 20, and a plurality of independent groove portions 14 are formed. In the former method, the depth and width of the groove 14 can be finely controlled, and the welding method and welding state in the third step can be finely changed. On the other hand, in the latter method, the covering portion 10 in a predetermined region can be removed in a short time. Further, in the step of removing the covering portion 10, since mechanical removal is performed with a blade at a depth equal to or greater than the thickness of the covering portion 10, organic matter or the like that obstructs welding remains in the conductor portion 19 shown in FIG. 4. Therefore, it is possible to improve the joining reliability in the welding process described later.

  Then, at the end of the first step, as shown in FIG. 6, the conductor end portion 11 is formed by cutting the conductor portion 19 exposed by removing the covering portion 10 into a predetermined length.

  Here, as shown in FIG. 7, the conductor end portion 11 desirably has a plurality of top portions 21. The conductor end portion 11 may have a flat portion 22, but the presence of the top portion 21 at a plurality of locations can increase the number of contact points at the time of welding in the third step, thereby enabling more accurate welding. It is what.

  In the first step described here, as shown in FIG. 4 or 5, the covering portion 10 is peeled off or removed by one cutting tool 18, but a plurality of cutting tools (not shown) are attached to the covering conductor 8. The elements of the first step may be configured by rotating the plurality of cutting tools or the covered conductors 8 after arranging them radially with respect to the center.

  Next, as a second step, the outer periphery of the conductor end portion 11 and the terminal portion 12 are brought into contact as shown in FIG. Here, in a state where the outer periphery of the conductor end portion 11 and the terminal portion 12 are simply in contact with each other, a first pressing terminal 23 that presses the conductor end portion 11 and a second pressing terminal 24 that presses the terminal portion 12; Is an initial value D0. Then, as shown in FIG. 9, a force is applied to the first pressing terminal 23 and the second pressing terminal 24 so that the conductor end portion 11 and the terminal portion 12 press each other. The distance between the first pressing terminal 23 and the second pressing terminal 24 at this time is defined as a pressing value D1.

  By pressing the conductor end portion 11 and the terminal portion 12 together, the top portion 21 shown in FIG. 7 corresponding to the outer periphery of the conductor end portion 11 is deformed so that the conductor end portion 11 and the terminal portion 12 shown in FIG. It becomes the flat top part 25 which contacts. Thereby, the conductor end portion 11 and the terminal portion 12 come into contact with each other at the plurality of contact points 26 between the plurality of conductor end portions 11 and the terminal portion 12.

  Further, the contact between the conductor end portion 11 and the terminal portion 12 is a displacement value before and after the pressing of the distance between the first pressing terminal 23 and the second pressing terminal 24 in order to always keep a stable state for each product. (D0-D1) is managed. Thereby, the flat top part 25 can be made into the respectively similar shape.

  Next, as a third step, a current is passed between the first pressing terminal 23 and the second pressing terminal 24. Due to this current, heat is generated in the contact resistance existing at the contact point 26, and the conductor end portion 11 and the terminal portion 12 are welded around the contact point 26. Here, as shown in FIG. 2A, the terminal portion 12 uses, for example, iron or an iron alloy as the base material 15, copper or a copper alloy as the base layer 16, and tin or a tin alloy as the outer layer 17. It is desirable. By adopting the configuration of the terminal portion 12 described above, it is possible to obtain sufficient mechanical strength of the terminal portion 12, and it is easy to weld by disposing a metal having a relatively low melting point temperature in the outer layer 17. It is possible to form the joint portion 13 by.

  In the method described above, when the third step is performed after the conductor end 11 and the terminal portion 12 are pressed together so that a flat top is formed as shown in FIG. 9, the conductor end 11 The terminal portion 12 and the like are shaped as shown in the perspective view of FIG. Here, the top surface side of the conductor end portion 11 has an uneven shape in which the groove portion 14 disappears or is deformed, and the groove portion 14 exists in a clear state only on the side surface side of the conductor end portion 11. Even in that case, since the welded portion 13 enters the groove portion 14, the contact area between the welded portion 13 and the groove portion 14 is increased, and electrical connection between the conductor end portion 11 and the terminal portion 12 and the machine are performed. The reliability of the joint is improved.

  Also, welding is performed at a higher temperature, and the conductor end 11 is directly welded to the base layer 16 as shown in FIG. 11A before and after FIG. The welded portion 13 made of the outer layer 17 may be formed. In this case, the conductor end 11 and the underlayer 16 are welded after the same metal or similar alloy is brought to the melting point or higher, so that the strength of the bond is greatly improved both mechanically and electrically. It can be made to. Here, in the cross-sectional view, the top surface side of the conductor end portion 11 is shown in an arc shape. However, as described above, the top surface side has an uneven shape in which a groove (not shown) disappears or is deformed. It does n’t matter.

  As described above, in this method, as shown in FIG. 9, welding is performed at sites corresponding to the plurality of contact points 26, so welding is performed on a wide area as a plurality of points on an average. Accordingly, the welded portion 13 shown in FIG. 1 after welding also exists over a wide range, and the stability and reliability of the joined state can be improved. At the same time, as described above, the welded portion 13 is positioned in the groove portion 14 as shown in FIG. 1, and the contact area between the conductor end portion 11 and the joint portion 13 and the terminal portion 12 is increased. Also, the stability and reliability of the joined state can be improved.

  Further, even if the contact state between the conductor end portion 11 and the terminal portion 12 shown in FIG. 9 fluctuates, the fluctuation range is distributed to a plurality of contact points 26. The state can be made very stable as compared with the case where it is performed at a pinpoint.

  Further, as shown in FIGS. 4 and 5, since the removal of the covered portion 10 of the covered conductor 8 is performed by a mechanical method, no thermal deterioration occurs at the time of removal of the covered portion 10 at the covered end portion 27. It will not be. Therefore, even when heat due to welding propagates during welding, deterioration due to the heat can be suppressed to a limited one.

  As a result, as shown in FIG. 1, even when the conductor wiring portion 9 and the covering end portion 27 are close to each other, it is possible to suppress the occurrence of dielectric breakdown of the covering portion 10 at the conductor intersection portion 28. In addition to the reliability with respect to insulation, the coil component 6 can be reduced in size. In particular, when a highly heat-resistant material such as a three-layer copper wire is used for the covering portion 10 as the covering conductor 8, the thermal stress in the case where the covering portion 10 is thermally removed may cause various coil components 6. It will affect the part. Therefore, it is effective in improving the reliability of the coil component 6 as a whole by not being affected by the removal of the covering portion 10 due to heat.

  Here, the second step and the third step have been described as separate steps, but these steps may be performed simultaneously as long as the values of D0 and D1 in FIGS. 8 and 9 can be managed. There is nothing.

  As described above, the manufacturing method using the coil component 6 as an example as shown in FIG. 1 is described here. However, as shown in FIG. 1, the coated conductor 8 is an important component as shown in FIG. This is a representative example due to its large effect because it is a device that easily approaches and intersects. Therefore, the present invention can be applied to a capacitive device (not shown), a resistor (not shown), or a composite device thereof, and any device that joins the conductor end 11 to the terminal portion 12 can be used. Applicable to devices.

  The electronic component of the present invention makes it possible to ensure an accurate joining state regardless of the area and the amount of the welded portion, and at the same time, it is possible to always stably form the joined portion. It has an effect and is useful in various electronic devices.

The perspective view of the electronic component in 1st embodiment of this invention (A) 1st sectional drawing of the terminal part of the electronic component in 1st embodiment of this invention, (b) 1st sectional view of the terminal part of the electronic component in 1st embodiment of this invention. Sectional drawing of the terminal part of the electronic component in 1st embodiment of this invention The 1st perspective view of the conductor part in the manufacturing method of the electronic component in 2nd embodiment of this invention The 2nd perspective view of the conductor part in the manufacturing method of the electronic component in 2nd embodiment of this invention. 3rd perspective view of the conductor part in the manufacturing method of the electronic component in 2nd embodiment of this invention The 4th perspective view of the conductor part in the manufacturing method of the electronic component in 2nd embodiment of this invention. The 1st side view of the terminal part in the manufacturing method of the electronic component in 2nd embodiment of this invention The 2nd side view of the terminal part in the manufacturing method of the electronic component in 2nd embodiment of this invention The perspective view of the terminal part in the manufacturing method of the electronic component in 2nd embodiment of this invention (A) Sectional view before welding of terminal part in manufacturing method of electronic component in second embodiment of present invention, (b) After welding of terminal part in manufacturing method of electronic component in second embodiment of present invention Cross section of Perspective view of conventional electronic components Side view of the terminal part of a conventional electronic component

Explanation of symbols

6 Coil parts 7 Body portion 8 Covered conductor 9 Conductor wiring portion 10 Cover portion 11 Conductor end portion 12 Terminal portion 13 Joint portion 14 Groove portion 15 Base material 16 Underlayer 17 Outer layer 18 Bit 19 Conductor portion 20 Second bit 21 Top portion 22 Flat Part 23 first pressing terminal 24 second pressing terminal 25 flat top part 26 contact point 27 covering end part 28 conductor crossing part

Claims (4)

The main body,
A conductor portion comprising a conductor wiring portion wired to the main body portion and a conductor end portion provided at an end portion of the conductor wiring portion;
A terminal portion implanted in the main body portion;
A welding portion connecting the conductor end portion and the terminal portion;
An electronic component in which a plurality of groove portions are provided in an outer peripheral direction with an extending direction of the conductor end portion as an axis at least at a part of the conductor end portion. The electronic component according to claim 1, wherein at least one of the plurality of grooves has a depth different from that of the other grooves. The main body,
A coated conductor portion comprising a coated conductor wiring portion wired to the main body portion and a coated conductor end portion provided at an end portion of the coated conductor wiring portion;
A terminal portion implanted in the main body portion;
A welded portion for connecting the terminal portion and the conductor end portion from which the covering portion of the coated conductor end portion is peeled off,
A first step of peeling the covering portion of the covering conductor portion and providing a groove on the outer periphery of the conductor end;
The welded portion is provided by a second step of bringing the outer periphery of the conductor end portion into contact with the terminal portion and pressing each other, and a third step of passing a current between the terminal portion and the conductor end portion. ,
The manufacturing method of the electronic component which joins the said terminal part and the said conductor edge part. The method for manufacturing an electronic component according to claim 3, wherein the second step and the third step are performed simultaneously.

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