JP6912853B2 - Coil parts and their manufacturing methods - Google Patents

Description

The present invention relates to coil parts and methods for manufacturing the same.

Conventionally, as a coil component, there is one described in Japanese Patent Application Laid-Open No. 2001-102227 (Patent Document 1). This coil component includes a core having a winding core portion and a first flange portion and a second flange portion provided at both ends in the axial direction of the winding core portion, a wire wound around the winding core portion, and a first flange. It is provided with a portion and a second flange portion, and is provided with an electrode portion to which an end portion of a wire is connected.

Japanese Unexamined Patent Publication No. 2001-102227

By the way, when manufacturing the conventional coil component, in the step of connecting the end portion of the wire to the electrode portion, the end portion of the wire and the electrode portion are pressed by a heater, and the end portion of the wire is thermocompression bonded to the electrode portion. ing. The heater is longer than the total length of the upper surface of the electrode portion in the direction orthogonal to the axial direction of the winding core portion.

At this time, if the upper surface of the electrode portion is not flat in the direction orthogonal to the axial direction of the winding core portion, it becomes difficult to press the heater against the portion of the electrode portion connected to the end portion of the wire. In particular, when the portion of the electrode portion connected to the end of the wire is recessed more than the other portion of the electrode portion, or when the core is not parallel to the heater, the electrode portion is used in the heat pressing operation by the heater. Cannot be pressed against the part connected to the end of the wire in. Therefore, the connection strength of the end portion of the wire to the electrode portion is reduced.

Further, when the heater is brought into contact with the entire length of the electrode portion, the contact area of the heater with the electrode portion becomes large, oxidation of the electrode portion is promoted by the heat of the heater, and the wettability of the solder to the electrode portion deteriorates. do.

Therefore, an object of the present invention is to provide a coil component capable of improving the connection strength of the end portion of the wire to the electrode portion and improving the wettability of the solder to the electrode portion, and a method for manufacturing the coil component.

In order to solve the above problems, the coil component of the present invention is used.
A core having a winding core portion and a first flange portion and a second flange portion provided at both ends in the axial direction of the winding core portion, and
The wire wound around the core and
It is provided with an electrode portion provided on the first flange portion and the second flange portion and to which an end portion of the wire is connected.
The upper surface of the electrode portion is located between the lower surface including the portion connected to the end portion of the wire, the higher surface located higher than the lower surface, and the lower surface and the higher surface. It has stepped surfaces that reach both end surfaces of the electrode portion in the axial direction of the winding core portion.

According to the coil component of the present invention, the upper surface of the electrode portion includes a low-level surface including a portion connected to the end of the wire, a high-level surface at a position higher than the low-level surface, and a low-level surface and a high-level surface. It is located between them and has a stepped surface extending to both end surfaces of the winding core portion in the axial direction of the electrode portion.

Then, in order to form the upper surface of the electrode portion having such a low-level surface, a high-level surface and a stepped surface, the wire is formed by the heater so that the end edges of the heater reach both end surfaces in the axial direction of the winding core portion of the electrode portion. The end portion and the electrode portion are pressed to thermocompression-bond the end portion of the wire to the electrode portion.

As a result, the heater can be pressed against the portion of the electrode portion connected to the end of the wire even if the upper surface of the electrode portion is not flat in the direction orthogonal to the axial direction of the winding core portion. , The connection strength of the end of the wire to the electrode is improved.

Further, since the heater is brought into contact with a part of the electrode portion, oxidation of the electrode portion due to the heat of the heater can be suppressed, and the wettability of the solder to the electrode portion can be improved. Therefore, when the electrode portion of the coil component is soldered to the mounting substrate, the bonding of the electrode portion by solder is good.

Further, in the coil component of one embodiment, there are two stepped surfaces, and the two stepped surfaces are arranged so as to sandwich the lower surface.

According to the coil component of the above embodiment, the two stepped surfaces are arranged so as to sandwich the lower surface. Then, in order to form the upper surface of the electrode portion having such a stepped surface, the end of the wire is formed by the heater so that the two end edges of the heater intersect the both end surfaces of the electrode portion and sandwich the end portion of the wire. By pressing the portion and the electrode portion, the end portion of the wire is thermocompression bonded to the electrode portion.

As a result, the pressing load of the heater can be intensively applied to the portion of the electrode portion connected to the end portion of the wire, and the connection strength of the end portion of the wire to the electrode portion is further improved. Further, the contact area of the heater with the electrode portion can be reduced, the oxidation of the electrode portion by the heater can be further suppressed, and the wettability of the solder to the electrode portion can be further improved.

Further, in the coil component of one embodiment, the stepped surface is parallel to the axial direction of the winding core portion.

According to the coil component of the above embodiment, the stepped surface is parallel to the axial direction of the winding core portion. Then, in order to form the upper surface of the electrode portion having such a stepped surface, the end portion of the wire and the electrode portion are pressed by the heater so that the end edge of the heater is parallel to the axial direction of the winding core portion. The end of the wire is thermocompression bonded to the electrode.

As a result, the contact area of the heater with the electrode portion can be reduced, the pressing load on the end portion of the wire and the electrode portion by the heater can be increased, and the connection strength of the end portion of the wire with the electrode portion is further improved. Further, the contact area of the heater with the electrode portion can be reduced, the oxidation of the electrode portion by the heater can be further suppressed, and the wettability of the solder to the electrode portion can be further improved.

In addition, in the method for manufacturing coil parts of one embodiment,
An electrode portion forming step in which electrode portions are provided on the first and second flanges at both ends of the core winding core in the axial direction, and
A wire winding step of winding a wire around the winding core portion of the core, and
The electrode portion is provided with a wire connecting step of connecting the end portion of the wire.
In the wire connecting step,
The end portion of the wire and the electrode portion are pressed by the pressing surface of the heater so that the end edge of the pressing surface of the heater intersects both end surfaces of the electrode portion in the axial direction of the winding core portion of the wire. The end portion is thermocompression bonded to the electrode portion.

According to the method for manufacturing a coil component of the above embodiment, the end of the wire and the electrode portion are formed by the pressing surface of the heater so that the end edges of the pressing surface of the heater intersect with both end faces in the axial direction of the winding core portion of the electrode portion. Is pressed to thermocompression-bond the end of the wire to the electrode.

As a result, even if the upper surface of the electrode portion is not flat in the direction orthogonal to the axial direction of the winding core portion, the pressing surface of the heater is pressed against the portion of the electrode portion connected to the end of the wire. The connection strength of the end of the wire to the electrode is improved.

Further, since the pressing surface of the heater is brought into contact with a part of the electrode portion, oxidation of the electrode portion by the heater can be suppressed and the wettability of the solder to the electrode portion can be improved. Therefore, when the electrode portion of the coil component is soldered to the mounting substrate, the bonding of the electrode portion by solder is good.

Further, in the method for manufacturing a coil component of one embodiment, in the wire connecting step, the two end edges of the pressing surface of the heater intersect the both end surfaces of the electrode portion and sandwich the end portion of the wire. In addition, the end portion of the wire and the electrode portion are pressed by the pressing surface of the heater, and the end portion of the wire is thermocompression bonded to the electrode portion.

According to the method for manufacturing a coil component of the above embodiment, in the wire connecting step, the heater is pressed so that the two end edges of the pressing surface of the heater intersect the both end surfaces of the electrode portion and sandwich the end of the wire. The end of the wire and the electrode are pressed by the surface, and the end of the wire is thermocompression bonded to the electrode. As a result, the pressing load of the heater can be intensively applied to the portion of the electrode portion connected to the end portion of the wire, and the connection strength of the end portion of the wire to the electrode portion is further improved. Further, the contact area of the pressing surface of the heater with the electrode portion can be reduced, the oxidation of the electrode portion by the heater can be further suppressed, and the wettability of the solder to the electrode portion can be further improved.

Further, in the method for manufacturing a coil component of one embodiment, in the wire connecting step, the pressing surface of the heater is used so that the edge of the pressing surface of the heater is parallel to the axial direction of the winding core portion. The end of the wire and the electrode are pressed to thermocompression-bond the end of the wire to the electrode.

According to the method for manufacturing a coil component of the above embodiment, in the wire connecting step, the end of the wire and the end of the wire are formed by the pressing surface of the heater so that the edge of the pressing surface of the heater is parallel to the axial direction of the winding core. The electrode portion is pressed and the end portion of the wire is thermocompression bonded to the electrode portion. As a result, the contact area of the pressing surface of the heater with the electrode portion can be reduced, the pressing load on the end portion of the wire and the electrode portion by the heater can be increased, and the connection strength of the end portion of the wire with the electrode portion is further improved. do. Further, the contact area of the pressing surface of the heater with the electrode portion can be reduced, the oxidation of the electrode portion by the heater can be further suppressed, and the wettability of the solder to the electrode portion can be further improved.

According to the coil component of the present invention, the upper surface of the electrode portion includes a low-level surface including a portion connected to the end of the wire, a high-level surface at a position higher than the low-level surface, and a low-level surface and a high-level surface. It is located between them and has a stepped surface extending to both end surfaces of the winding core portion in the axial direction of the electrode portion. As a result, the connection strength of the end portion of the wire to the electrode portion can be improved, and the wettability of the solder to the electrode portion can be improved.

According to the method for manufacturing a coil component of the present invention, the end portion of the wire and the electrode portion are formed by the pressing surface of the heater so that the end edges of the pressing surface of the heater intersect with both end surfaces in the axial direction of the winding core portion of the electrode portion. Press to heat-bond the end of the wire to the electrode. As a result, the connection strength of the end portion of the wire to the electrode portion can be improved, and the wettability of the solder to the electrode portion can be improved.

It is a perspective view which shows the coil component of one Embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is explanatory drawing explaining the manufacturing method of a coil part. It is explanatory drawing explaining the manufacturing method of a coil part. FIG. 4A is a plan view of FIG. 4A. It is explanatory drawing explaining the manufacturing method of a coil part. It is explanatory drawing explaining the manufacturing method of a coil part. It is a plot figure which compares the area of the non-wet part in the partial crimping of this invention and the whole crimping of a comparative example.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is a perspective view of the coil component according to the embodiment of the present invention as viewed from the mounting surface side. As shown in FIG. 1, the coil component 1 functions as, for example, an inductor. The coil component 1 has a core 10, a wire 20 wound around the core 10, and an electrode portion 30 provided on the core 10.

The core 10 includes a winding core portion 13, a first flange portion 11 provided at one end of the winding core portion 13 in the axial direction, and a second flange portion 12 provided at the other end of the winding core portion 13 in the axial direction. Has. As the material of the core 10, for example, alumina (non-magnetic material), Ni—Zn-based ferrite (magnetic material, insulator), resin, or other material having a dielectric constant of 20 or less is used.

The core 10 has a mounting surface mounted on a mounting board (not shown) and an anti-mounting surface opposite to the mounting surface. In FIG. 1, the mounting surface of the core 10 is located on the upper side, and the anti-mounting surface of the core 10 is located on the lower side. The direction (axial direction) connecting one end and the other end of the winding core portion 13 is the X direction, the direction orthogonal to the X direction on the mounting surface of the core 10 is the Y direction, and the mounting surface and the anti-mounting surface of the core 10 are defined as each other. The connecting direction is the Z direction. The Z direction is orthogonal to the X and Y directions. The X direction is the length direction of the coil component 1, the Y direction is the width direction of the coil component 1, and the Z direction is the height direction of the coil component 1.

The winding core portion 13 extends axially from one end to the other end. The shape of the winding core portion 13 is a rectangular parallelepiped. The shape of the winding core portion 13 may be another shape such as a cylinder.

The end face 115 of the first flange portion 11 is connected to one end of the winding core portion 13. The first flange portion 11 has a first side surface 111 on the mounting surface side of the core 10 and a second side surface 112 on the anti-mounting surface side of the core 10.

The end face 125 of the second flange portion 12 is connected to the other end of the winding core portion 13. The second flange portion 12 has a first side surface 121 on the mounting surface side of the core 10 and a second side surface 122 on the anti-mounting surface side of the core 10.

The electrode portion 30 is provided on the first side surface 111 of the first flange portion 11 and the first side surface 121 of the second flange portion 12. The electrode portion 30 is electrically connected to an electrode of a mounting board (not shown) by soldering, whereby the coil component 1 is mounted on the mounting board.

The wire 20 is wound around the winding core portion 13 in a coil shape. The first end portion 21 of the wire 20 is electrically connected to the electrode portion 30 of the first flange portion 11, and the second end portion 22 of the wire 20 is electrically connected to the electrode portion 30 of the second flange portion 12. Will be done. The wire 20 has, for example, a conductor such as Cu, Ag, Au, and a coating film that covers the conductor.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. As shown in FIGS. 1 and 2, the electrode portion 30 has an upper surface 35 in the Z direction and both end faces 36 and 36 in the axial direction (X direction) of the winding core portion 13. The size of the upper surface 35 in the XY direction is slightly larger than the size of the first side surface 111 of the first flange portion 11 in the XY direction.

The upper surface 35 has a low surface 31, a high surface 32 located higher than the low surface 31, and a stepped surface 33 located between the low surface 31 and the high surface 32. Hereinafter, the electrode portion 30 on the first flange portion 11 side will be described, but the electrode portion 30 on the second flange portion 12 side also has the same configuration.

The lower surface 31 is located at the center in the Y direction. The low surface 31 includes a portion connected to the first end 21 of the wire 20. The first end 21 of the wire 20 is located in the center of the lower surface 31. The upper surface of the first end 21 of the wire 20 is at the same height as the lower surface 31. The length of the lower surface 31 in the Y direction is shorter than the length of the upper surface 35 in the Y direction, and is longer than half the length of the upper surface 35 in the Y direction. The lower surface 31 is an XY surface. The lower surface 31 may be an inclined surface or a curved surface.

The high surface 32 is provided on both sides of the low surface 31 in the Y direction. The high surfaces 32 and 32 on both sides have the same height. The height difference t between the low surface 31 and the high surface 32 is, for example, 5 μm or more. The high surface 32 is an XY surface and is parallel to the low surface 31. The high surface 32 may be an inclined surface or a curved surface.

The step surface 33 intersects the low surface 31 and the high surface 32. There are two stepped surfaces 33. The two stepped surfaces 33 are arranged so as to sandwich the lower surface 31. The stepped surface 33 reaches both end surfaces 36, 36. The stepped surface 33 is parallel to the axial direction (X direction) of the winding core portion 13. The step surface 33 is an XZ surface, and is orthogonal to the low surface 31, the high surface 32, and the end surface 36. The stepped surface 33 may be an inclined surface or a curved surface.

The electrode portion 30 has a lower metal layer 30a and a plating layer 30b laminated on the metal layer 30a. The metal layer 30a is composed of, for example, Ag. The plating layer 30b is composed of, for example, a single layer or a plurality of layers. When the plating layer 30b is composed of a single layer, the plating layer 30b is composed of a layer containing Sn. When the plating layer 30b is composed of a plurality of layers, the outermost layer of the plating layer 30b is composed of a layer containing Sn.

The first end 21 of the wire 20 is embedded in the plating layer 30b. The first end 21 of the wire 20 is thermocompression bonded to the plating layer 30b, so that the coating of the wire 20 is melted together with the plating layer 30b, and the conductor of the wire 20 is electrically connected to the plating layer 30b. ..

Next, a method of manufacturing the coil component 1 will be described.

As shown in FIG. 3, electrode portions 30 are provided on the first flange portion 11 and the second flange portion 12 of the core 10. This is called an electrode portion forming step. As an example, the metal layer 30a (see FIG. 2) of the electrode portion 30 is composed of Ag or the like, has a film thickness of 1 to 20 μm or a discontinuous film, and is formed by dip coating, printing, sputtering, or the like. .. The plating layer 30b (see FIG. 2) of the electrode portion 30 is composed of Ni, Cu, Sn, etc., has a film thickness of 1 to 20 μm, and is formed by plating.

After that, the wire 20 is wound around the core portion 13 of the core 10. This is called a wire winding process. As an example, the first flange portion 11 of the core 10 is fixed to the first chuck 51, and the first end portion 21 of the wire 20 sent out from the winding nozzle (not shown) is attached to the electrode portion 30 of the first flange portion 11. The wire 20 is wound around the winding core portion 13 by temporarily fixing the core 10 and rotating the core 10 relative to the winding nozzle. Then, the second flange portion 12 of the core 10 is fixed to the second chuck 52, and the second end portion 22 of the wire 20 is temporarily fixed to the electrode portion 30 of the second flange portion 12.

After that, as shown in FIGS. 4A and 4B, the first end portion 21 of the wire 20 is connected to the electrode portion 30 of the first flange portion 11, and the second end portion 22 of the wire 20 is connected to the electrode portion 12 of the second flange portion 12. Connect to unit 30. This is called a wire connection process.

A heater 40 is used in the wire connecting step. The heater 40 is formed in a rectangular parallelepiped and extends from the first chuck 51 to the second chuck 52, and includes a first side surface 41, a second side surface 42 facing the first side surface 41, and a first side surface 41. It has a pressing surface 43 located between the second side surface 42 and the second side surface 42. The side of the pressing surface 43 on the first side surface 41 side constitutes the first end edge 45. The side of the pressing surface 43 on the second side surface 42 side constitutes the second end edge 46. The pressing surface 43 is flat, but may be a curved surface or an inclined surface. Further, although the first and second edge edges 45 and 46 are composed of sides, they may be composed of curved surfaces and inclined surfaces.

The distance between the first edge 45 and the second edge 46 (that is, the length of the heater 40 in the Y direction) is shorter than the length of the electrode portion 30 (first flange portion 11) in the Y direction, and , The length of the electrode portion 30 (first flange portion 11) is longer than half of the length in the Y direction. The length of the first edge 45 and the second edge 46 in the X direction (that is, the length of the heater 40 in the X direction) is longer than the length of the coil component 1 in the X direction.

In the wire connecting step, the first and second edge 41, 42 of the pressing surface 43 of the heater 40 intersects the both end surfaces 36, 36 of the electrode portion 30, so that the pressing surface 43 of the heater 40 makes the wire 20 first. 1. The second end portions 21 and 22 and the electrode portion 30 are pressed, and the first and second end portions 21 and 22 of the wire 20 are thermocompression bonded to the electrode portion 30.

At this time, the first and second end edges 41 and 42 of the pressing surface 43 of the heater 40 intersect the both end surfaces 36 and 36 of the electrode portion 30 and hold the first and second end portions 21 and 22 of the wire 20. Arranged so as to sandwich. The first and second end edges 41 and 42 of the heater 40 are parallel to the axial direction (X direction) of the winding core portion 13.

The wire connecting process on the first flange portion 11 side will be described. The same applies to the wire connecting step on the second flange portion 12 side.

As shown in FIG. 5, the first end portion 21 of the wire 20 is temporarily fixed to the flat upper surface 35 of the electrode portion 30, and the pressing surface 43 of the heater 40 applies heat to the first end portion 21. The first end portion 21 is pressed. Then, as shown in FIG. 6, the heat of the heater 40 melts and deforms the first end portion 21 and the electrode portion 30 (plating layer 30b), and the first end portion 21 is thermocompression bonded to the electrode portion 30. .. As a result, the lower surface 31, the higher surface 32, and the stepped surface 33 are provided on the upper surface 35 of the electrode portion 30. That is, the upper surface 35 pressed by the pressing surface 43 of the heater 40 softens and deforms to become the lower surface 31.

According to the manufacturing method of the coil component 1, the first and second end edges 45 and 46 of the pressing surface 43 of the heater 40 intersect with both end surfaces 36 and 36 of the winding core portion 13 of the electrode portion 30 in the axial direction. The pressing surface 43 of the heater 40 presses the first and second ends 21 and 22 and the electrode portion 30 of the wire 20 to heat the first and second ends 21 and 22 of the wire 20 to the electrode portion 30. Crimping. As a result, in the coil component 1, the upper surface 35 of the electrode portion 30 has a low surface 31, a high surface 32, and a step surface 33.

As a result, even if the upper surface 35 of the electrode portion 30 is not flat in the direction orthogonal to the axial direction of the winding core portion 13, the pressing surface 43 of the heater 40 can be pressed by the first and second wires 20 in the electrode portion 30. It can be pressed against the portion connected to the ends 21 and 22, and the connection strength of the first and second ends 21 and 22 of the wire 20 to the electrode portion 30 is improved.

Further, since the pressing surface 43 of the heater 40 is brought into contact with a part of the electrode portion 30, oxidation of the electrode portion 30 due to the heat of the heater 40 can be suppressed, and the wettability of the solder to the electrode portion 30 can be improved. Therefore, when the electrode portion 30 of the coil component 1 is soldered to the mounting substrate, the bonding of the electrode portion 30 by soldering is good.

For example, as shown in FIG. 7, in the partial crimping of the present invention and the total crimping of the comparative example, the areas of the non-wet parts (non-wet parts) of the solder were compared at three places each. Here, the overall crimping of the comparative example means that the pressing surface of the heater is brought into contact with the entire electrode portion to be crimped.

In the partial crimping of the present invention, the area of the first non-wetting portion is 0.003 mm ^{2 as} shown in the diamond plot, and the area of the second non-wetting portion is 0.003 mm 2 as shown in the square plot. It is 0.005 mm ² , and the area of the third non-wet portion is 0.005 mm ² , as shown in the triangular plot. On the other hand, in the total crimping of the comparative example, the area of the first non-wetting portion is 0.013 mm ^{2 as} shown in the diamond plot, and the area of the second non-wetting portion is as shown in the square plot. In addition, ^{it is 0.016 mm 2} , and the area of the third non-wetting portion is 0.035 mm ² , as shown in the triangular plot. Therefore, in the present invention, the area of the non-wetting portion is reduced as compared with the comparative example.

According to the method for manufacturing the coil component 1, the two first and second end edges 45 and 46 of the pressing surface 43 of the heater 40 intersect with both end surfaces 36 and 36 of the electrode portion 30 and are the first of the wires 20. , The second end portions 21 and 22 are arranged so as to sandwich the second end portions 21 and 22. As a result, in the coil component 1, the two stepped surfaces 33 are arranged so as to sandwich the lower surface 31.

As a result, the pressing load of the heater 40 can be intensively applied to the portions of the electrode portion 30 connected to the first and second end portions 21 and 22 of the wire 20, and the first and second ends of the wire 20 can be applied. The connection strength of the second end portions 21 and 22 to the electrode portion 30 is further improved. Further, the contact area of the pressing surface 43 of the heater 40 with the electrode portion 30 can be reduced, the oxidation of the electrode portion 30 by the heater 40 can be further suppressed, and the wettability of the solder to the electrode portion 30 can be further improved.

According to the method of manufacturing the coil component 1, the first and second end edges 45 and 46 of the pressing surface 43 of the heater 40 are arranged so as to be parallel to the axial direction of the winding core portion 13. As a result, in the coil component 1, the stepped surface 33 becomes parallel to the axial direction of the winding core portion 13.

As a result, the contact area of the pressing surface 43 of the heater 40 with the electrode portion 30 can be reduced, and the pressing load of the wire 20 by the heater 40 on the first and second ends 21 and 22 and the electrode portion 30 can be increased. The connection strength of the first and second end portions 21 and 22 of the wire 20 to the electrode portion 30 is further improved. Further, the contact area of the pressing surface 43 of the heater 40 with the electrode portion 30 can be reduced, the oxidation of the electrode portion 30 by the heater 40 can be further suppressed, and the wettability of the solder to the electrode portion 30 can be further improved.

The present invention is not limited to the above-described embodiment, and the design can be changed without departing from the gist of the present invention.

In the above embodiment, one electrode portion is provided for each of the first flange portion and the second flange portion, but a plurality of electrode portions may be provided. Further, in the above-described embodiment, one wire is provided, but a plurality of wires may be provided. In this case, the coil component functions as, for example, a transformer.

In the above embodiment, the two edge edges of the pressing surface of the heater are pressed against the electrode portion so as to provide two stepped surfaces on the electrode portion, but the heater is provided with one stepped surface on the electrode portion. One edge of the pressing surface may be pressed against the electrode portion. In this case, the length of the heater in the Y direction may be longer than the length of the electrode portion in the Y direction.

In the above embodiment, the heater is pressing the electrode portion of the first flange portion and the electrode portion of the second flange portion at the same time, but the heater may press the two electrode portions separately.

In the above embodiment, the electrode portion of the first flange portion and the electrode portion of the second flange portion are provided with a low-level surface, a high-level surface, and a stepped surface. Higher surfaces and stepped surfaces may be provided.

In the above embodiment, the core is provided with two first and second flanges, but the core may be provided with three or more collars. At this time, electrode portions may be provided on three or more flange portions.

In the above embodiment, the edge of the pressing surface of the heater is pressed against the electrode portion so that the stepped surface is parallel to the axial direction of the winding core portion, but the stepped surface is predetermined in the axial direction of the winding core portion. The edge of the pressing surface of the heater may be pressed against the electrode portion so as to intersect at an angle. That is, the stepped surface does not have to be orthogonal to the axial direction of the winding core portion. In other words, the stepped surface may not reach both end surfaces of the electrode portion in the Y direction. If the stepped surface reaches both end faces of the electrode portion in the Y direction, the electrode portion is pressed by the pressing surface of the heater so that the edge of the pressing surface of the heater intersects both end surfaces of the electrode portion in the Y direction. become. As a result, when the upper surface of the electrode portion is not flat in the Y direction, it becomes difficult to press the heater against the portion connected to the wire end portion of the electrode portion.

1 Coil parts 10 Core 11 1st flange 111 1st side surface 112 2nd side surface 115 End surface 12 2nd flange part 121 1st side surface 122 2nd side surface 125 End surface 13 Wind core 20 Wire 21 1st end 22 2nd end Part 30 Electrode part 30a Metal layer 30b Plating layer 31 Low surface 32 High surface 33 Step surface 35 Top surface 36 End surface 40 Heater 43 Pressing surface 45 First edge 46 Second edge

Claims (6)

A core having a winding core portion and a first flange portion and a second flange portion provided at both ends in the axial direction of the winding core portion, and
The wire wound around the core and
It is provided with an electrode portion provided on the first flange portion and the second flange portion and to which an end portion of the wire is connected.
The electrode portion is provided on a flat first side surface of the first flange portion on the mounting surface side and a flat first side surface of the second flange portion on the mounting surface side.
The upper surface of the electrode portion is located between the lower surface including the portion connected to the end portion of the wire, the higher surface located higher than the lower surface, and the lower surface and the higher surface. It has stepped surfaces that reach both end surfaces of the electrode portion in the axial direction of the winding core portion.
A coil component having a height difference t between the low surface and the high surface of 5 μm or more. The coil component according to claim 1, wherein there are two stepped surfaces, and the two stepped surfaces are arranged so as to sandwich the lower surface. The coil component according to claim 1 or 2, wherein the stepped surface is parallel to the axial direction of the winding core portion. The first and second flanges at both ends of the core portion in the axial direction, which are flat first side surfaces on the mounting surface side of the first flange portion and the mounting surface side of the second flange portion. An electrode portion forming step of providing an electrode portion on the flat first side surface of the
A wire winding step of winding a wire around the winding core portion of the core, and
The electrode portion is provided with a wire connecting step of connecting the end portion of the wire.
In the wire connecting step,
The end portion of the wire and the electrode portion are pressed by the pressing surface of the heater so that the end edge of the pressing surface of the heater intersects both end surfaces of the electrode portion in the axial direction of the winding core portion of the wire. The end portion was thermocompression bonded to the electrode portion, and as a result,
On the upper surface of the electrode portion, a low-level surface including a portion connected to the end of the wire, a high-level surface at a position higher than the low-level surface, and between the low-level surface and the high-level surface are located. the electrode portion and the and the stepped surface extending on both end surfaces of the winding core axis provided with height difference t between the lower surface and the high surface that Do and 5μm or more, the manufacturing method of the coil component. In the wire connecting step, the end portion of the wire is formed by the pressing surface of the heater so that the two end edges of the pressing surface of the heater intersect the both end surfaces of the electrode portion and sandwich the end portion of the wire. The method for manufacturing a coil component according to claim 4, wherein the electrode portion is pressed and the end portion of the wire is thermocompression bonded to the electrode portion. In the wire connecting step, the end portion of the wire and the electrode portion are pressed by the pressing surface of the heater so that the end edge of the pressing surface of the heater is parallel to the axial direction of the winding core portion. The method for manufacturing a coil component according to claim 4 or 5, wherein the end portion of the wire is thermocompression bonded to the electrode portion.

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