CN219778671U

CN219778671U - Coil component

Info

Publication number: CN219778671U
Application number: CN202222792291.5U
Authority: CN
Inventors: 增田幸信; 中本慎吾; 桥本良太
Original assignee: Murata Manufacturing Co Ltd
Current assignee: Murata Manufacturing Co Ltd
Priority date: 2021-11-10
Filing date: 2022-10-21
Publication date: 2023-09-29
Anticipated expiration: 2032-10-21
Also published as: JP2023071004A

Abstract

The utility model provides a coil component capable of ensuring connection reliability of an electric wire and a terminal electrode. The coil component is provided with: an iron core having a winding core portion and a pair of flange portions provided at both ends of the winding core portion; an electric wire wound around the winding core; a terminal electrode provided at each of the pair of flange portions; and a conductive member provided on the terminal electrode and electrically connecting the electric wire to the terminal electrode, the outer surface of the terminal electrode having a first region and a second region having lower wettability than the first region and contacting at least a part of the outer periphery of the first region, the conductive member having a contact surface contacting the outer surface of the terminal electrode, the contact surface contacting at least a part of the first region, and at least a part of the outer periphery of the contact surface contacting the second region.

Description

Coil component

Technical Field

The present utility model relates to a coil component.

Background

Conventionally, there is a coil component described in international publication No. 2020/255593 (patent document 1). The coil component includes an iron core having a winding core portion and a pair of flange portions provided at both ends of the winding core portion, an electric wire wound around the winding core portion, and terminal electrodes provided at the pair of flange portions, respectively. The end of the wire is electrically connected to the terminal electrode.

Patent document 1: international publication No. 2020/255593.

In the conventional coil component, the end of the wire is connected to the terminal electrode, for example, by solder.

In addition, the electric wire is connected to the terminal electrode by pressing the end portion onto the terminal electrode provided parallel to the direction in which the winding core portion extends after the end portion is led out in the direction away from the winding core portion and applying solder. Therefore, when the end portion of the wire is connected to the terminal electrode, residual stress remains at the end portion of the wire in a direction perpendicular to the contact surface between the terminal electrode and the solder, and the end portion of the wire is likely to move in the direction.

The solder has a hemispherical shape due to surface tension, and the tip thereof becomes thinner as the contact surface between the terminal electrode and the solder is directed in the above direction. Therefore, when the end of the wire is connected to the terminal electrode, the amount of solder decreases with the direction, and therefore the contact area between the solder and the wire decreases, resulting in insufficient connection reliability between the wire and the terminal electrode.

Disclosure of Invention

Accordingly, the present utility model provides a coil component capable of ensuring connection reliability of an electric wire and a terminal electrode.

In order to solve the above problems, a coil component according to an embodiment of the present disclosure includes:

an iron core having a winding core portion and a pair of flange portions provided at both ends of the winding core portion;

an electric wire wound around the winding core;

a terminal electrode provided at each of the pair of flange portions; and

a conductive member provided on the terminal electrode and electrically connecting the electric wire to the terminal electrode,

the outer surface of the terminal electrode has a first region and a second region having lower wettability than the first region and contacting at least a part of the outer periphery of the first region,

the conductive member has a contact surface contacting the outer surface of the terminal electrode,

the contact surface is in contact with at least a portion of the first region,

at least a part of the outer periphery of the contact surface is in contact with the second region.

Here, the conductive member is, for example, solder or a conductive resin paste, which is a member existing independently of the electric wire and the terminal electrode. The conductive member is not a member integrated with the electric wire and the terminal electrode as a molten ball formed by melting the electric wire and the terminal electrode by welding such as laser irradiation.

According to the above aspect, since at least a part of the outer periphery of the contact surface between the conductive member and the outer surface of the terminal electrode is in contact with the second region having relatively low wettability, the height of the conductive member in the direction orthogonal to the contact surface can be increased as compared with the case where the conductive member is not in contact with the second region. Therefore, the height of the conductive member in the direction in which the wire is away from the terminal electrode can be increased, and the connection reliability between the wire and the terminal electrode can be ensured.

Preferably in one embodiment of the coil assembly,

when at least a part of the outer periphery of the contact surface is a first portion and a portion of the outer periphery of the contact surface other than the first portion is a second portion,

and when an angle formed by a tangent line passing through the first portion of the conductive member and the contact surface in the first cross section is set to a first angle, and an angle formed by a tangent line passing through the second portion of the conductive member and the contact surface in the second cross section is set to a second angle,

the first angle is greater than the second angle,

the first cross section is a plane orthogonal to the contact surface and passing through the center of the first portion in the longitudinal direction and the center of gravity of the contact surface, and the second cross section is a plane orthogonal to the contact surface and passing through the center of the second portion in the longitudinal direction and the center of gravity of the contact surface.

According to the above embodiment, the height of the conductive member in the direction orthogonal to the contact surface can be more effectively increased, and the connection reliability between the electric wire and the terminal electrode can be more reliably ensured.

Preferably in one embodiment of the coil assembly,

the first region is formed of Sn,

The second region is composed of a metal alloy containing Cu or Fe as a main component.

According to the above embodiment, the height of the conductive member in the direction orthogonal to the contact surface can be further increased, and thus the connection reliability between the electric wire and the terminal electrode can be more reliably ensured.

Preferably in one embodiment of the coil assembly,

when at least a part of the outer periphery of the contact surface is set as a first portion,

the length of the first portion is one quarter or more of the entire length of the outer periphery of the contact surface.

According to the above embodiment, the height of the conductive member in the direction orthogonal to the contact surface can be effectively increased, and thus the connection reliability of the electric wire and the terminal electrode can be more reliably ensured.

Preferably in one embodiment of the coil assembly,

the length of the first portion is one half or more of the entire length of the outer periphery of the contact surface.

According to the above embodiment, the height of the conductive member in the direction orthogonal to the contact surface can be more effectively increased, and thus the connection reliability of the electric wire and the terminal electrode can be more reliably ensured.

Preferably in one embodiment of the coil assembly,

The contact portion between the first region and the second region has a linear shape.

According to the above embodiment, the second region can be easily formed by laser irradiation, printing, or the like.

Preferably in one embodiment of the coil assembly,

the shape of the contact portion between the first region and the second region is a convex shape protruding toward the first region.

Preferably in one embodiment of the coil assembly,

regarding the shape of the conductive member, the shape of the contact surface is an oblong shape.

According to the above embodiment, since the contact surface is oblong in shape, the conductive member is not part of a regular sphere, but part of an elliptical sphere or the like, for example. Therefore, when the electric wire is arranged such that the longitudinal direction of the oblong shape is parallel to the extending direction of the end portion of the electric wire, the contact area between the electric wire and the conductive member can be increased as compared with a case where the conductive member is a part of a regular sphere. As a result, the connection reliability between the electric wire and the terminal electrode can be ensured more reliably.

Preferably in one embodiment of the coil assembly,

the conductive member has a concave portion at a top portion in a direction perpendicular to the contact surface.

In the case where the conductive member is hemispherical in shape, the amount of the conductive member gradually decreases in a direction orthogonal to the outer surface of the terminal electrode, and thus the amount of the conductive member decreases near the top of the conductive member. Therefore, when the electric wire moves in a direction away from the terminal electrode, there is a possibility that the end of the electric wire and the terminal electrode cannot be sufficiently connected. According to the above embodiment, since the recess is provided, the amount of the conductive member can be suppressed from gradually decreasing in the direction orthogonal to the outer surface of the terminal electrode, and therefore the end portion of the electric wire can be sufficiently connected to the terminal electrode.

Preferably in one embodiment of the coil assembly,

the iron core is made of ferrite.

According to the above embodiment, heat resistance of the iron core can be ensured. In addition, even when the conductive member is a member that needs to be heated, such as solder, the inductance can be ensured while maintaining the magnetic permeability at a high level.

Preferably in one embodiment of the coil assembly,

the ferrite has a Curie point of 150 ℃ or higher.

According to the above embodiment, even in use at high temperature, deterioration of the characteristics of the core can be reduced.

Preferably, the ferrite has a volume resistivity of 10 ⁶ Omega cm or more.

According to the above embodiment, the insulation of the core can be ensured, and the short circuit between the terminal electrodes can be prevented.

Preferably in one embodiment of the coil assembly,

the initial permeability of ferrite is 900 or more.

According to the above embodiment, the efficiency of obtaining the inductance value is improved.

Preferably in one embodiment of the coil assembly,

the magnetic plate is fixed across the pair of flange portions.

According to the above embodiment, the closed magnetic circuit is configured, and the efficiency of obtaining the inductance value can be improved.

Preferably in one embodiment of the coil assembly,

the magnetic plate is fixed to the pair of flange portions by an epoxy resin adhesive.

According to the above embodiment, the epoxy resin adhesive is thermosetting, and thus heat resistance of the adhesive can be ensured.

Preferably in one embodiment of the coil assembly,

the terminal electrode is fixed to the pair of flange portions by an epoxy resin adhesive.

According to the above embodiment, heat resistance of the adhesive can be ensured.

Preferably in one embodiment of the coil assembly,

the terminal electrode contains Fe as a main component.

According to the above embodiment, heat resistance of the terminal electrode can be ensured.

Preferably in one embodiment of the coil assembly,

the terminal electrode contains Cu as a main component.

Preferably in one embodiment of the coil assembly,

the coil member has a length of 25mm to 45mm, and a width of 20mm to 45 mm.

According to the above embodiment, miniaturization of the coil component can be achieved.

Preferably in one embodiment of the coil assembly,

the electric wire has a wire and an insulating film containing polyamide imide as a main component covering the wire.

According to the above embodiment, heat resistance of the electric wire can be ensured.

Preferably in one embodiment of the coil assembly,

the thickness of the insulating film is 4 μm or more and 10 μm or less.

Preferably in one embodiment of the coil assembly,

the diameter of the wire is 30 μm or more and 70 μm or less.

Preferably in one embodiment of the coil assembly,

in a common mode choke coil, an inductance value when a common mode signal is passed at a measurement frequency of 100kHz is 11 mu H or more and 300 mu H or less,

In the common mode choke coil, a first flange portion of the pair of flange portions is provided with a first terminal electrode and a third terminal electrode, a second flange portion is provided with a second terminal electrode and a fourth terminal electrode, the electric wire has a first electric wire and a second electric wire, a first end portion of the first electric wire is connected to the first terminal electrode, a second end portion of the first electric wire is connected to the second terminal electrode, a first end portion of the second electric wire is connected to the third terminal electrode, and a second end portion of the second electric wire is connected to the fourth terminal electrode.

According to the above embodiment, the efficiency of obtaining the inductance value can be improved.

According to the coil component of the embodiment of the present disclosure, connection reliability between the electric wire and the terminal electrode can be ensured.

Drawings

Fig. 1 is a perspective view showing a first embodiment of a coil component.

Fig. 2 is a plan view of the terminal electrode and the conductive member.

Fig. 3A is a cross-sectional view A-A of fig. 2.

Fig. 3B is a B-B cross-sectional view of fig. 2.

Fig. 4 is a plan view of a terminal electrode and a conductive member according to a second embodiment.

Fig. 5 is a plan view of a terminal electrode and a conductive member according to a third embodiment.

Fig. 6 is a perspective view of a terminal electrode and a conductive member according to a fourth embodiment.

Description of the reference numerals

A coil component of 1 …, a core of 10 …, a first flange portion of 11 …, an inner end surface of 111 …, an outer end surface of 112 …, a bottom surface of 113 …, a top surface of 114 …, a side surface of 115 …, a second flange portion of 12 …, an inner end surface of 121 …, an outer end surface of 122 …, a bottom surface of 123 …, a top surface of 124 …, a side surface of 125 …, a winding core of 13 …, a wire of 21 …, a first terminal electrode of 31, 31C …, a bottom surface portion of 311 …, a side surface portion of 312, 312C …, a second terminal electrode of 32 …, a bottom surface portion of 321 …, a side surface portion of 322 …, a conductive member of 50, 50A to 50C …, a length of a portion of 50R … concave portion, a center of C1, a C2 …, a length of a portion of L1 to L3 … contact with the second region, a first region of R1, a to R1C 37, a second region of R2A to R2C …, a first portion of R22A R37, a second portion of R22C 37, a second portion of R22R 37, a third portion of R37C 37 to R37C 37, a third peripheral portion of R37P 37, a third portion of d 37P 37 and a portion of d 37P 37, a second portion of d 2C 37 and a portion of d ….

Detailed Description

The coil component, which is an embodiment of the present disclosure, will be described in detail below with reference to the illustrated embodiments. In addition, some of the drawings include schematic diagrams, and may not reflect actual dimensions or ratios.

(first embodiment)

Fig. 1 is a perspective view showing a first embodiment of a coil component. As shown in fig. 1, the coil component 1 includes: the electric wire comprises an iron core 10, an electric wire 21 wound around the iron core 10, a first terminal electrode 31 and a second terminal electrode 32 which are provided on the iron core 10 and connected with the electric wire 21, and a conductive member 50 electrically connecting the electric wire 21 with the first terminal electrode 31 and the second terminal electrode 32. The coil component 1 is used as a winding coil such as a common mode choke coil, a transformer, and a coupled inductor.

The core 10 has a winding core portion 13 having a shape extending in a constant direction and around which the electric wire 21 is wound, a first flange portion 11 provided at a first end of the winding core portion 13 in the extending direction and extending in a direction orthogonal to the extending direction, and a second flange portion 12 provided at a second end of the winding core portion 13 in the extending direction and extending in a direction orthogonal to the extending direction. The extending direction of the winding core 13 is also referred to as the axial direction of the winding core 13. The shape of the cross section of the winding core portion 13 orthogonal to the axial direction is not particularly limited, but is quadrangular in the present embodiment. The cross-sectional shape may be other polygonal shapes such as a hexagon, a circle, an ellipse, or a combination of these shapes as appropriate. The material of the iron core 10 is preferably a magnetic material such as a ferrite sintered body or a molded body containing a magnetic powder resin, or may be a non-magnetic material such as alumina or a resin.

In the following, the bottom surface of the core 10 is set to be a surface to be mounted on the mounting board, and a surface of the core 10 opposite to the bottom surface is set to be a top surface of the core 10. The axial direction of the winding core portion 13 is defined as the L direction, the direction orthogonal to the L direction in the bottom surface of the core 10 is defined as the W direction, and the opposing direction of the bottom surface and the top surface of the core 10 is defined as the T direction. The T direction is orthogonal to the L direction and the W direction. In the present specification, the negative direction of the T direction is set to be upper, and the positive direction of the T direction is set to be lower. In fig. 1, the bottom surface of the core 10 faces upward. The L direction is also referred to as the longitudinal direction of the core 10, the W direction is also referred to as the width direction of the core 10, and the T direction is also referred to as the height direction of the core 10.

The first flange 11 has an inner end surface 111 facing the winding core 13, an outer end surface 112 facing the opposite side of the inner end surface 111, a bottom surface 113 connecting the inner end surface 111 and the outer end surface 112 and facing the mounting board side when mounted, a top surface 114 facing the opposite side of the bottom surface 113, and two side surfaces 115 connecting the inner end surface 111 and the outer end surface 112 and connecting the bottom surface 113 and the top surface 114.

The second flange portion 12 has an inner end surface 121 facing the winding core portion 13 side, an outer end surface 122 facing the opposite side from the inner end surface 121, a bottom surface 123 connecting the inner end surface 121 and the outer end surface 122 and facing the mounting substrate side at the time of mounting, a top surface 124 facing the opposite side from the bottom surface 123, and two side surfaces 125 connecting the inner end surface 121 and the outer end surface 122 and connecting the bottom surface 123 and the top surface 124.

The electric wire 21 has a wire and an insulating coating film covering the wire. The conductive wire is made of a metal having good conductivity, such as copper, silver, gold, or the like. The insulating film is made of a resin such as polyurethane or polyamideimide. The first end of the wire 21 is electrically connected to the first terminal electrode 31, and the second end of the wire 21 is electrically connected to the second terminal electrode 32. The number of turns of the electric wire 21 is not particularly limited, and may be one turn, or may be two or more than three turns.

The first terminal electrode 31 is provided in the first flange 11, and the second terminal electrode 32 is provided in the second flange 12. The first and second terminal electrodes 31 and 32 are fixed to the first and second flange portions 11 and 12, respectively, by an adhesive such as epoxy resin. The first and second terminal electrodes 31 and 32 are formed by bending a metal plate such as Cu, ag, au, fe, stainless steel (SUS), phosphor bronze, or the like. The first and second terminal electrodes 31 and 32 may be plated with Sn, ni/Sn, or the like.

The first terminal electrode 31 has a bottom surface portion 311 facing the bottom surface 113 of the first flange 11, and a side surface portion 312 connected to the bottom surface portion 311 and facing the side surface 115 of the first flange 11. The shape of the bottom surface portion 311 is not particularly limited, but in the present embodiment, it is a rectangular shape having four sides parallel to the L direction and the W direction when viewed from the T direction. The shape of the side surface portion 312 is not particularly limited, but in the present embodiment, it is a rectangular shape having four sides parallel to the T direction and the L direction when viewed from the W direction. The second terminal electrode 32 has a bottom surface portion 321 facing the bottom surface 123 of the second flange portion 12, and a side surface portion 322 connected to the bottom surface portion 321 and facing the side surface 125 of the second flange portion 12. The shape of the bottom surface 321 is not particularly limited, but in the present embodiment, it is a rectangular shape having four sides parallel to the L direction and the W direction when viewed from the T direction. The shape of the side surface portion 322 is not particularly limited, but in the present embodiment, it is a rectangular shape having four sides parallel to the T direction and the L direction when viewed from the W direction. The first terminal electrode 31 fixes a first end of the electric wire 21, and the second terminal electrode 32 fixes a second end of the electric wire 21.

The conductive member 50 is, for example, solder or conductive resin paste, which is a member existing independently of the electric wire and the terminal electrode. The conductive member 50 is not a member integrated with the electric wire and the terminal electrode as a molten ball formed by melting the electric wire and the terminal electrode by welding such as laser irradiation. The conductive members 50 are provided on the first terminal electrode 31 and the second terminal electrode 32, respectively. The conductive member 50 electrically connects the first end of the electric wire 21 with the first terminal electrode 31 and electrically connects the second end of the electric wire 21 with the second terminal electrode 32. In fig. 1, the conductive member 50 provided in the second terminal electrode 32 is not shown. In fig. 1, the ridge line of the conductive member 50 is also shown as a solid line.

When the coil component 1 is mounted on a mounting board, the bottom surface 113 of the first flange 11 and the bottom surface 123 of the second flange 12 face the mounting board. At this time, the axial direction of the winding core portion 13 is parallel to the main surface of the mounting substrate. That is, the coil component 1 is a transverse coil in which the winding axis of the electric wire 21 is parallel to the mounting board.

Fig. 2 is a plan view of the side surface portion 312 of the first terminal electrode 31 and the conductive member 50 when viewed from the W direction. As shown in fig. 2, the outer surface of the side surface portion 312 of the first terminal electrode 31 has a first region R1 and a second region R2. The second region R2 has lower wettability to the conductive member 50 than the first region R1. The second region R2 is in contact with at least a part of the outer periphery of the first region R1. The second region R2 is also referred to as a conductive member non-wetting region. The second region R2 is not free from wettability with respect to the conductive member 50, as long as wettability is lower than that of the first region R1. In the present specification, wettability refers to the ease of adhesion of the conductive member 50 to the terminal electrodes 31 and 32. As an example of a method of evaluating wettability, for example, a metal plate made of the same conductive material as the terminal electrodes 31 and 32 is prepared, and the same conductive material as the conductive member 50 is attached to the metal plate. Then, the angle of the conductive material side is measured at the angle formed between the outer surface of the conductive material attached to the outer surface and the surface of the metal plate at the position where the outer surface is in contact with the metal plate. It can be evaluated that the larger the angle, the lower the wettability, i.e., the less likely the wettability. In the following description, the conductive member 50 provided on the first terminal electrode 31 is described, but the conductive member 50 provided on the second terminal electrode 32 has the same structure as the conductive member 50 provided on the first terminal electrode 31, and therefore, a detailed description thereof is omitted.

In the present embodiment, the first region R1 has a rectangular shape when viewed from the W direction. Specifically, the first region R1 has a rectangular shape having a first side and a second side parallel to the L direction and opposed to each other in the T direction, and a third side and a fourth side parallel to the T direction and opposed to each other in the L direction. The lengths of the first side and the second side are the same as the L-direction length of the side surface portion 312 of the first terminal electrode 31. The first and second sides of the first region R1 have lengths longer than those of the third and fourth sides. The second region R2 has a rectangular shape when viewed from the W direction. Specifically, the second region R2 has a rectangular shape having a first side and a second side parallel to the L direction and opposed to each other in the T direction, and a third side and a fourth side parallel to the T direction and opposed to each other in the L direction. The length of the second region R2 in the L direction is the same as the length of the side surface portion 312 of the first terminal electrode 31 in the L direction. The lengths of the first and second sides of the second region R2 are longer than those of the third and fourth sides. The second region R2 is disposed adjacent to the first region R1 above the first region R1 when viewed from the W direction. The width of the second region R2 in the W direction is smaller than the width of the first region R1 in the W direction. In the present embodiment, the extending direction of the first end portion of the electric wire 21 connected to the first terminal electrode 31 is parallel to the L direction. Thereby, the first end portion of the electric wire 21 can be easily connected to the first terminal electrode 31. Further, since the extending direction of the first end portion of the electric wire 21 is parallel to the extending direction (L direction) of the longer first side and second side of the first to fourth sides of the first region R1, the connection reliability between the electric wire 21 and the first terminal electrode 31 can be further ensured.

The first terminal electrode 31 in the first region R1 is, for example, a structure in which Cu is Sn-plated. The first terminal electrode 31 in the second region R2 is composed of, for example, cu alone. For example, sn can be stripped by laser light, cutting, or the like of Cu plated with Sn to expose Cu, thereby forming the second region R2. Since Sn has a higher affinity for solder than Cu, the wettability of solder for Sn is higher than that for Cu. Therefore, in the case of using solder as the conductive member 50, wettability of the second region R2 is lower than that of the first region R1. The structures of the first region R1 and the second region R2 are not limited to the above-described structure, as long as the wettability of the second region R2 is lower than that of the first region R1. For example, the wettability may be varied by making the surface roughness of the first region R1 and the second region R2 different.

The conductive member 50 is provided in at least a part of the first region R1. In the present embodiment, the conductive member 50 is provided over the entire region of the first region R1. However, the conductive member 50 is not limited to this, and may be provided in a part of the first region R1. For example, the conductive member 50 may be provided in a region other than four corners of the first region R1 which is a rectangular shape. The conductive member 50 may be provided in a part or the whole of the first region R1, and may be provided to the second region beyond a contact portion between the first region R1 and the second region R2. In fig. 2, the conductive member 50 is shown with dots attached for convenience. The conductive member 50 has a contact surface CF1 that contacts the outer surface of the first terminal electrode 31. The contact surface CF1 contacts at least a portion of the first region R1. In the present embodiment, the contact surface CF1 contacts the entire area of the first region R1. The contact surface CF1 has a rectangular shape when viewed from the W direction, and has the same shape as the first region R1. At least a portion of the outer periphery P0 of the contact surface CF1 is in contact with the second region R2. Specifically, one of the four sides of the outer periphery of the contact surface CF1 on the negative side in the T direction is in contact with the second region R2. In the present embodiment, a portion of the outer periphery P0 of the contact surface CF1 that contacts the second region R2 is referred to as a first portion. That is, the first portion corresponds to one side of the negative side in the T direction among the four sides of the outer periphery P0 of the contact surface CF1 when viewed from the W direction. In fig. 2, the first part is shown with reference sign P1. In addition, a portion of the outer periphery P0 of the contact surface CF1 that is not in contact with the second region R2, that is, a portion other than the first portion is referred to as a second portion. That is, the second portion corresponds to three sides of the four sides of the outer periphery P0 of the contact surface CF1, which are combined with one side on the positive side in the T direction, one side on the positive side in the L direction, and one side on the negative side in the L direction. In fig. 2, the second part is shown with reference sign P2.

Fig. 3A is a cross-sectional view A-A of fig. 2. Specifically, fig. 3A is a cross section (hereinafter, referred to as a "first cross section") of a plane S1 orthogonal to the contact surface CF1 and passing through the center C1 of the first portion P1 in the longitudinal direction and the center of gravity G of the contact surface CF 1. Fig. 3B is a B-B cross-sectional view of fig. 2. Specifically, fig. 3B is a cross section (hereinafter, referred to as "second cross section") orthogonal to the contact surface CF1 and passing through a center C2 in the longitudinal direction of the second portion P2 in the outer periphery of the contact surface CF1 and a plane S2 of the center of gravity G of the contact surface CF 1. Here, the center in the longitudinal direction of the first portion refers to the center in the longitudinal direction of the continuous line in the case where the first portion is a continuous line shape having no angle, and the center in the longitudinal direction of the first portion refers to the center in the longitudinal direction of any one of the sides in the case where the first portion is a line shape having an angle, that is, a plurality of sides. The "side" includes not only straight lines but also curved lines. The same applies to the center of the second portion in the longitudinal direction. In the present embodiment, the first portion P1 is linear, and the center C1 in the longitudinal direction of the first portion P1 is the center in the longitudinal direction of the linear portion. In the present embodiment, the second portion P2 is three sides of four sides of a rectangle, and the center C2 in the longitudinal direction of the second portion P2 is the center in the longitudinal direction on one side of the negative side in the L direction of the three sides.

As shown in fig. 3A, in the present embodiment, the conductive member 50 is provided in the first region R1 so as to be wet-expanded to the boundary between the first region R1 and the second region R2. The outer surface of the conductive member 50 has a convex curved surface on the positive side in the W direction in the first cross section. Here, in the first cross section, the angle on the conductive member 50 side out of the angles formed by the tangent TL1 of the conductive member 50 passing through the center C1 and the contact surface CF1 is set to the first angle θ1. In the present embodiment, as shown in fig. 3B, the conductive member 50 is provided in the first region R1 so as to wet and spread to the edge of the side surface portion 312 of the first terminal electrode 31. The outer surface of the conductive member 50 has a convex curved surface on the positive side in the W direction in the second cross section. Here, in the second cross section, the angle on the conductive member 50 side out of the angles formed by the tangent TL2 of the conductive member 50 passing through the center C2 and the contact surface CF1 is set to the second angle θ2. The first angle θ1 is greater than the second angle θ2.

According to the coil component 1, since at least a part of the outer periphery P0 of the contact surface CF1 between the conductive member 50 and the terminal electrodes 31 and 32 is in contact with the second region R2 having relatively low wettability, the height of the conductive member 50 in the direction (W direction) orthogonal to the contact surface CF1 can be increased as compared with the case where the conductive member is not in contact with the second region R2. Thus, even when the wire 21 after winding has residual stress and the end of the wire 21 moves in the direction orthogonal to the contact surface CF1, a decrease in the contact area between the end of the wire 21 and the conductive member 50 (that is, the volume of the portion of the wire 21 covered with the conductive member 50) can be suppressed. As a result, the connection reliability between the electric wire 21 and the terminal electrodes 31 and 32 can be ensured.

Further, since the first angle θ1 is larger than the second angle θ2, the height of the conductive member 50 in the direction orthogonal to the contact surface CF1 can be more effectively increased. As a result, the connection reliability between the electric wire 21 and the terminal electrodes 31 and 32 can be ensured more reliably.

Further, if the terminal electrodes 31 and 32 and the electric wire 21 are melted by laser irradiation, there is a possibility that the electric wire 21 is melted without being left in the molten ball. In this case, the connection strength between the electric wire 21 and the terminal electrodes 31 and 32 needs to be adjusted by the laser irradiation strength or the like. On the other hand, since the coil member 1 is connected by the conductive member 50 such as solder or conductive paste, the electric wire 21 is not melted and remains in the conductive member 50, and the electric wire 21 and the terminal electrodes 31 and 32 can be stably connected.

Preferably, the first region R1 is made of Sn, and the second region R2 is made of Cu or a metal alloy containing Fe as a main component. Examples of the metal alloy constituting the second region R2 include phosphor bronze (Cu 70% or so) and SUS (Fe 70% or so). Accordingly, the height of the conductive member 50 in the direction orthogonal to the contact surface CF1 can be more effectively increased, and thus the connection reliability between the electric wire 21 and the terminal electrodes 31 and 32 can be more reliably ensured.

The length L1 of the first portion P1 is preferably one quarter or more of the entire length of the outer periphery of the contact surface CF 1. Accordingly, the height of the conductive member 50 in the direction (W direction) orthogonal to the contact surface can be more effectively increased, and thus the connection reliability between the electric wire 21 and the terminal electrodes 31 and 32 can be more reliably ensured.

The contact portion between the first region R1 and the second region R2 is preferably linear in shape. Accordingly, the second region R2 can be easily formed by laser irradiation, printing, or the like.

The core 10 is preferably made of ferrite. Accordingly, heat resistance of the core 10 can be ensured. Even when the conductive member 50 is a member that needs to be heated, such as solder, the magnetic permeability can be maintained high to ensure inductance.

The ferrite of the core 10 preferably has a curie point of 150 ℃ or higher. Accordingly, even in use at high temperature, deterioration of the characteristics of the core 10 can be reduced.

Preferably, ferrite of the core 10 has a volume resistivity of 10 ⁶ Omega cm or more. Accordingly, the insulation of the core 10 can be ensured, and the short circuit between the terminal electrodes 31 and 32 can be prevented.

The ferrite of the core 10 preferably has an initial permeability of 900 or more. Accordingly, the efficiency of obtaining the inductance value can be improved.

Preferably, a magnetic plate is provided so as to be fixed across the pair of flange portions 11, 12. Accordingly, the closed magnetic circuit is configured, and thus the efficiency of obtaining the inductance value can be improved.

Preferably, the magnetic plate 15 is fixed to the pair of flange portions 11 and 12 by an epoxy resin adhesive. Accordingly, the epoxy resin adhesive is thermosetting, so that the heat resistance of the adhesive can be ensured. Even in the case where the conductive member 50 is a member that needs to be heated, such as solder, the heat resistance of the adhesive can be ensured at the time of use of the conductive member 50.

The terminal electrodes 31 and 32 preferably contain Fe as a main component. Accordingly, heat resistance of the terminal electrodes 31 and 32 can be ensured. Even when the conductive member 50 is a member that needs to be heated, such as solder, heat resistance of the terminal electrodes 31 and 32 can be ensured when the conductive member 50 is used.

The terminal electrodes 31 and 32 preferably contain Cu as a main component. Accordingly, heat resistance of the terminal electrodes 31 and 32 can be ensured. Even when the conductive member 50 is a member that needs to be heated, such as solder, heat resistance of the terminal electrodes 31 and 32 can be ensured when the conductive member 50 is used.

The insulating coating of the electric wire 21 preferably contains polyamide imide as a main component. Accordingly, heat resistance of the electric wire 21 can be ensured. Even in the case where the conductive member 50 is a member that needs to be heated, such as solder, the heat resistance of the electric wire 21 can be ensured at the time of use of the conductive member 50. When the coating of the electric wire 21 is peeled off by laser irradiation at the time of connecting the electric wire 21 to the terminal electrodes 31 and 32, the coating of the electric wire 21 is easily peeled off according to the above configuration.

The thickness of the insulating coating of the electric wire 21 is preferably 4 μm or more and 10 μm or less. Accordingly, heat resistance of the electric wire 21 can be ensured. Even in the case where the conductive member 50 is a member that needs to be heated, such as solder, the heat resistance of the electric wire 21 can be ensured at the time of use of the conductive member 50. Further, since the thickness of the insulating film is 4 μm or more, heat resistance can be ensured for heat of the solder, and since the thickness of the insulating film is 10 μm or less, the insulating film is easily peeled off.

The diameter of the wire of the electric wire 21 is preferably 30 μm or more and 70 μm or less. Accordingly, heat resistance of the electric wire 21 can be ensured. Even in the case where the conductive member 50 is a member that needs to be heated, such as solder, the heat resistance of the electric wire 21 can be ensured at the time of use of the conductive member 50. Further, since the diameter of the wire is 30 μm or more, heat resistance of the solder can be ensured, and since the diameter of the wire is 70 μm or less, the wire is not easily broken off from the solder, and the wire can be connected to the terminal electrode more reliably.

The dimension of the coil component 1 in the L direction (longitudinal direction) is preferably 25mm or more and 45mm or less, and the dimension of the coil component 1 in the W direction (width direction) is preferably 20mm or more and 45mm or less. For example, the dimensions (L, W) of the coil component 1 are not less than (25 mm×20 mm) and not more than (45 mm×45 mm). The dimension in the L direction refers to the dimension of the longest portion in the L direction. The dimension in the W direction refers to the dimension of the longest portion in the W direction. Since the length in the L direction is 25mm or more, the heat of the solder is not easily transferred to the coil, and since the length in the L direction is 45mm or less, the coil component 1 can be miniaturized. Since the width in the W direction is 20mm or more, the degree of freedom in connection between the terminal electrode and the electric wire is high, and since the width in the W direction is 45mm or less, the coil component 1 can be miniaturized.

Preferably, the third terminal electrode is further provided on the first flange 11, the fourth terminal electrode is further provided on the second flange 12, the electric wire 21 has a first electric wire and a second electric wire, the first end of the first electric wire is connected to the first terminal electrode 31, the second end of the first electric wire is connected to the second terminal electrode 32, the first end of the second electric wire is connected to the third terminal electrode, and an inductance value when a common mode signal flows at a measurement frequency of 100kHz is 11 μh or more and 300 μh or less in the common mode choke coil. Accordingly, the efficiency of obtaining the inductance value is improved.

As a method for manufacturing the coil component 1, the following method can be exemplified. The ferrite powder is press-molded by a metal mold, and the resulting molded body is fired. And (3) carrying out roller grinding after firing to remove burrs. The plated metal plate is press-formed by a metal mold, and a terminal electrode having a bottom surface portion and a side surface portion is manufactured. Then, the plating layer is partially peeled off by laser, cutting, or the like, and a second region is provided in the terminal electrode. Next, the core is bonded to the terminal electrode with an adhesive or the like, thereby manufacturing a wound core. After the electric wire is wound around the winding core through the nozzle, the electric wire is electrically and physically connected to the first region of the terminal electrode by high-temperature solder or the like. At this time, at least a part of the outer periphery of the contact surface of the conductive member such as solder and the terminal electrode is brought into contact with the second region. As described above, the coil component 1 can be manufactured.

(second embodiment)

Fig. 4 is a plan view of the first terminal electrode and the conductive member when viewed from the W direction, showing a second embodiment of the coil member. The second embodiment is different from the first embodiment in the shapes of the first and second regions and the conductive member. The different configurations will be described below. The other structures are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are attached thereto, and the description thereof is omitted. In fig. 4, a diagonal line is added to the contact surface between the conductive member and the first terminal electrode for convenience.

As shown in fig. 4, in the present embodiment, the first region R1A has a rectangular shape when viewed from the W direction. Specifically, the first region R1A has a rectangular shape having a first side and a second side parallel to the L direction and opposed to each other in the T direction, and a third side and a fourth side parallel to the T direction and opposed to each other in the L direction. The lengths of the first side and the second side are shorter than the L-direction length of the side surface portion 312 of the first terminal electrode 31. The fourth side on the positive side in the L direction is the edge on the positive side in the L direction of the side surface portion 312. The second side located on the positive side in the T direction is an edge on the positive side in the T direction of the side surface portion 312. The second region R2A is L-shaped when viewed from the W direction. Specifically, the second region R2A has a rectangular first portion R21 extending in the L direction, a rectangular second portion R22 extending in the T direction, and a rectangular third portion R23 connecting the first portion R21 and the second portion R22. In fig. 4, the boundary between the first portion R21 and the third portion R23, and the boundary between the second portion R22 and the third portion R23 are shown by two-dot chain lines. The first portion R21 adjoins the first region R1A via a first side of the first region R1A located on the negative side in the T direction. The length of the first portion R21 in the L direction is the same as the length of the first side of the first region R1A. The second portion R22 adjoins the first region R1A via a third side of the first region R1A located on the negative side in the L direction. The length of the second portion R22 in the T direction is the same as the length of the third side of the first region R1A.

The conductive member 50A is disposed in at least a portion of the first region R1A. In the present embodiment, the conductive member 50A is provided over the entire area of the first region R1A. The conductive member 50A has a contact surface CF2 that contacts the first region R1A. The contact surface CF2 has a rectangular shape when viewed from the W direction, and has the same shape as the first region R1A. The contact surface CF2 is in contact with the second region R2 via one side of the negative side in the T direction and one side of the negative side in the L direction among the four sides of the outer periphery P0. That is, in the present embodiment, the first portion P1 corresponds to two sides of the four sides of the outer periphery P0, namely, one side on the negative side in the T direction and one side on the negative side in the L direction. The second portion P2 corresponds to two sides of the four sides of the outer periphery P0, namely, a side on the positive side in the T direction and a side on the positive side in the L direction. When the length of one side of the negative side in the T direction of the two sides of the first portion P1 is L2 and the length of one side of the negative side in the L direction is L3, the sum of L2 and L3 is equal to or more than half the entire length of the outer periphery P0 of the contact surface CF2. In other words, in the present embodiment, the length of the first portion P1 is one half or more of the entire length of the outer periphery of the contact surface CF2.

According to the above configuration, the contact portion between the outer periphery of the contact surface CF2 and the second region is longer than the contact portion between the outer periphery of the contact surface CF2 and the second region is shorter, so that the contact portion having the first angle θ1 can be further lengthened, and the height of the conductive member 50A can be increased. This can ensure more reliable connection between the electric wire 21 and the terminal electrodes 31 and 32.

(third embodiment)

Fig. 5 is a plan view of the first terminal electrode and the conductive member when viewed from the W direction, showing a third embodiment of the coil member. The third embodiment is different from the first embodiment in the shapes of the first and second regions and the conductive member. The different configurations will be described below. The other structures are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are attached thereto, and the description thereof is omitted. In fig. 5, a diagonal line is added to the contact surface between the conductive member and the first terminal electrode for convenience.

As shown in fig. 5, the conductive member 50B has a contact surface CF3 that contacts the first region R1B. In the present embodiment, the contact portion between the first region R1B and the second region R2B has a convex shape protruding toward the first region R1B. The conductive member 50B is disposed in at least a portion of the first region R1B. In the present embodiment, the conductive member 50B is provided in the entire region of the first region R1B. Therefore, the first portion P1 of the contact surface CF3 is also convex in shape, extending toward the contact surface CF3 side.

According to the above configuration, since the contact portion between the outer periphery of the contact surface CF3 and the second region is longer than the contact portion between the outer periphery of the contact surface CF3 and the second region is shorter, the contact portion having the first angle can be further lengthened, and the height of the conductive member 50B can be increased. This can ensure more reliable connection between the electric wire 21 and the terminal electrodes 31 and 32.

(fourth embodiment)

Fig. 6 is a perspective view of a fourth embodiment of the coil component, showing the first terminal electrode and the conductive component. The fourth embodiment is different from the first embodiment in the shapes of the terminal electrode, the first and second regions, and the conductive member. The different configurations will be described below. The other structures are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are attached thereto, and the description thereof is omitted. In fig. 5, a diagonal line is added to the contact surface between the conductive member and the first terminal electrode for convenience.

As shown in fig. 6, the edge on the positive side in the t direction of the side surface 312C of the first terminal electrode 31C is arcuate. The first region R1C is oblong when viewed from the W direction. Oblong includes oval, racetrack-shaped, formed by opposed straight lines and opposed arcs, and the like. In the present embodiment, the first region R1C is an ellipse having a long diameter LD parallel to the T direction and a short diameter SD parallel to the L direction. The first region R1C overlaps with an edge of the side surface portion 312C on the positive side in the T direction when viewed from the W direction. The second region R2C is disposed on the negative side in the T direction with respect to the first region R1C, and is adjacent to the first region R1C. In the present embodiment, the edge on the positive side in the T direction of the first terminal electrode 31C is arcuate, but the shape is not limited to this, and may be linear, for example. In the present embodiment, the shape of the contact portion between the first region R1C and the second region R2C is a part of an ellipse, but the present invention is not limited thereto, and may be, for example, a straight line.

The conductive member 50C is disposed in at least a portion of the first region R1C. In the present embodiment, the conductive member 50C is provided in the entire region of the first region R1C. The conductive member 50C has a contact surface CF4 that contacts the first region R1C. The contact surface CF4 is an oblong shape having a long diameter LD parallel to the T direction and a short diameter SD parallel to the L direction, similar to the first region R1C. The wire 21 is arranged such that the longitudinal direction LD of the contact surface CF4 is parallel to the extending direction of the end portion of the wire 21. The conductive member 50C has a concave portion 50R at the top in the direction (W direction) orthogonal to the contact surface CF4. As a method for forming the concave portion 50R, the following method can be mentioned, for example. The conductive material to be the conductive member 50C is attached to the terminal electrodes 31, 32, and then the curing speed of the conductive material is partially controlled so as to be cured from the vicinity of the top of the conductive member 50C in the direction orthogonal to the contact surface CF4. Thus, the conductive material near the top portion that has been cured first is lowered toward the negative side in the W direction, and the concave portion 50R can be formed.

According to the above configuration, since the contact surface CF4 has an oblong shape, the conductive member 50C has a shape other than a part of a regular sphere, for example, a part of an elliptical sphere or the like. Further, since the electric wire 21 is arranged such that the longitudinal direction LD of the contact surface CF4 is parallel to the extending direction of the end portion of the electric wire 21, the contact area of the electric wire 21 with the conductive member 50C (in other words, the volume of the portion of the electric wire 21 covered with the conductive member 50) can be increased as compared with the case where the conductive member having the contact surface CF4 in the shape of a circle is a part of a regular sphere. As a result, the connection reliability between the electric wire 21 and the terminal electrodes 31 and 32 can be ensured more reliably.

Further, since the conductive member 50C has a shape of, for example, a part of an elliptical sphere, the height of the conductive member 50C in the direction orthogonal to the contact surface CF4 can be increased as compared with the case where the conductive member has a shape of a part of a regular sphere. Therefore, the connection reliability between the electric wire 21 and the terminal electrodes 31 and 32 can be ensured more reliably. In addition, in the case where the conductive member is a part of a positive sphere, since the amount of the conductive member gradually decreases in the direction orthogonal to the outer surfaces of the terminal electrodes 31, 32, the amount of the conductive member near the top of the conductive member decreases. Therefore, when the electric wire 21 moves in a direction away from the terminal electrodes 31 and 32, there is a possibility that the end of the electric wire 21 cannot be sufficiently connected to the terminal electrodes 31 and 32. However, the presence of the recess 50R can suppress the gradual decrease in the amount of the conductive member in the direction orthogonal to the outer surfaces of the terminal electrodes 31, 32, so that the end portion of the electric wire 21 can be sufficiently connected to the terminal electrodes 31, 32.

The present disclosure is not limited to the above-described embodiments, and design changes may be made without departing from the spirit of the present disclosure. For example, the feature points of the first to fourth embodiments may be variously combined.

In the above embodiment, the coil component has one electric wire, but may have a plurality of electric wires, and the coil component may be used as a common mode choke coil.

In the above embodiment, one terminal electrode is provided in one flange portion, but a plurality of terminal electrodes may be provided in one flange portion.

In the above embodiment, the conductive member is provided in the entire first region, but may be provided in a part of the first region. The conductive member may be provided in a part or the whole of the first region, and may be provided in the second region across a contact portion between the first region and the second region.

In the above embodiment, a part of the outer periphery of the contact surface between the conductive member and the first region is in contact with the second region, but the entire outer periphery may be in contact with the second region. This can increase the height of the conductive member in the direction perpendicular to the contact surface, as compared with the case where a part of the outer periphery is in contact with the second region. As a result, the connection reliability between the electric wire and the terminal electrode can be ensured more reliably.

The shapes of the first region and the second region are not limited to the above embodiment as long as at least a part of the outer periphery of the contact surface of the conductive member with the first region is in contact with the second region.

Claims

1. A coil component, comprising:

an electric wire wound around the winding core;

a terminal electrode provided at each of the pair of flange portions; and

the outer surface of the terminal electrode has a first region and a second region, the second region having a lower wettability than the first region and the second region being in contact with at least a part of the outer periphery of the first region,

the contact surface is in contact with at least a portion of the first region,

2. The coil component of claim 1, wherein the coil component comprises a coil,

and when an angle formed by a tangent line of the conductive member passing through the first portion and the contact surface in the first cross section is set to a first angle, and an angle formed by a tangent line of the conductive member passing through the second portion and the contact surface in the second cross section is set to a second angle, the first angle is larger than the second angle,

Wherein the first cross section is a plane orthogonal to the contact surface and passing through a center of the first portion in a longitudinal direction and a center of gravity of the contact surface; the second cross section is a plane orthogonal to the contact surface and passing through a center of the second portion in the longitudinal direction and a center of gravity of the contact surface.

3. The coil component of claim 1, wherein the coil component comprises a coil,

4. The coil component of claim 1, wherein the coil component comprises a coil,

5. The coil component of claim 1, wherein the coil component comprises a coil,

6. The coil component of claim 1, wherein the coil component comprises a coil,

the contact portion between the first region and the second region has a convex shape protruding toward the first region.

7. The coil component of claim 1, wherein the coil component comprises a coil,

8. The coil component of claim 1, wherein the coil component comprises a coil,

9. Coil component according to any one of claims 1 to 8, characterized in that,

the iron core is made of ferrite.

10. The coil component of claim 9, wherein the coil component comprises a coil,

the ferrite has a Curie point of 150 ℃ or higher.

11. The coil component of claim 10, wherein the coil component comprises a coil,

the volume resistivity of the ferrite is 10 ⁶ Omega cm or more.

12. The coil component of claim 11, wherein the coil component comprises a coil,

the initial permeability of the ferrite is 900 or more.

13. The coil component of claim 12, wherein the coil component comprises a coil,

the coil member has a length of 25mm to 45mm, and a width of 20mm to 45 mm.

14. The coil component of claim 13, wherein the coil component comprises a coil,

In a common mode choke coil, an inductance value when a common mode signal is applied at a measurement frequency of 100kHz is 11 mu H or more and 300 mu H or less,

15. Coil component according to any one of claims 1 to 8, characterized in that,

the magnetic plate is fixed across the pair of flange portions.

16. The coil component of claim 15, wherein the coil component comprises a coil,

17. The coil component of claim 16, wherein the coil component comprises a coil,

18. The coil component of claim 17, wherein the coil component comprises a coil,

the coil member has a length of 25mm to 45mm, and a width of 20mm to 45 mm.

19. The coil component of claim 18, wherein the coil component comprises a coil,

20. The coil component of claim 17, wherein the coil component comprises a coil,

the coil member has a length of 25mm to 45mm, and a width of 20mm to 45 mm.

21. The coil component of claim 20, wherein the coil component comprises a coil,

22. The coil component of claim 17, wherein the coil component comprises a coil,

the coil member has a length of 25mm to 45mm, and a width of 20mm to 45 mm.

23. The coil component of claim 22, wherein the coil component comprises a coil,

24. Coil component according to any one of claims 1 to 8, characterized in that,

25. The coil component of claim 24, wherein the coil component comprises a coil,

the thickness of the insulating film is 4 μm or more and 10 μm or less.

26. The coil component of claim 25, wherein the coil component comprises a coil,

the diameter of the wire is 30 μm or more and 70 μm or less.

27. The coil component of claim 26, wherein the coil component comprises a coil,

The coil member has a length of 25mm to 45mm, and a width of 20mm to 45 mm.

28. The coil component of claim 27, wherein the coil component comprises a coil,