JP2018125397A - Coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil device that can be miniaturized, and that has a high mounting strength and an excellent thermal shock resistance characteristic.SOLUTION: A coil component 10 has: a winding core part 22; a first flange part 24 formed at a first end in a winding axial direction X of the winding core part 22; a second flange part 25 formed at a second end in the winding axial direction X of the winding core part 22; a first terminal electrode 51 formed on the first flange part 24; a second terminal electrode 52 formed on the second flange part 25; and a coil part 40 that consists of wires 41-43. The first terminal electrode 51 has a mounting first convex part 51b protruded to first end connection parts 51a1 and 51a2 connected with first end leads 41α-43α of the wires 41-43. The second terminal electrode 52 has a mounting second convex part 52b protruded to second end connection parts 52a1 and 52a2 connected with the second end leads 41β-43β of the wires 41-43. The mounting first convex part 51b and the mounting second convex part 52b are arranged with position deviation in a Y-axis direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a surface mount type coil device suitable for, for example, a vehicle-mounted application.

  As a coil device, for example, a coil device shown in Patent Document 1 below is known. In the coil device of Patent Document 1, when a lead wire of a coil is connected to an electrode portion and that portion becomes a mounting portion on a substrate, the portion to which the lead wire is connected is once affected by heat. There is a risk that the mounting strength may be reduced.

  Also, in recent years, coil devices have become smaller in size, and in structures that require multiple coils, connecting lead wires at the end of the terminal as in the prior art reduces the area that is not affected by heat, resulting in mounting. There is a risk of strength reduction.

Japanese Patent Laid-Open No. 9-219318

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a coil device that can be downsized, has high mounting strength, and has excellent thermal shock characteristics.

In order to achieve the above object, a coil device according to the present invention comprises:
A winding core,
A first flange formed at a first end along a first axis parallel to a winding axis direction of the winding core;
A second collar formed at a second end opposite to the first end along the first axis of the core;
A first terminal electrode formed on the first collar;
A second terminal electrode formed on the second collar,
A coil unit comprising at least one wire wound around the outer periphery of the core part,
The first terminal electrode has a first protrusion for mounting projecting with respect to a first end connection portion to which the first end lead of the wire is connected,
The second terminal electrode has a second mounting convex portion protruding with respect to a second end connecting portion to which the second end lead of the wire is connected,
The first mounting convex portion and the second mounting convex portion are disposed so as to be displaced in the direction of the second axis substantially perpendicular to the first axis.

  In the present invention, none of the leads is connected to the first mounting convex portion and the second mounting convex portion. Therefore, the surface of the terminal electrode is not deteriorated by attaching the lead by thermocompression bonding or the like, and the connection strength when these convex portions are connected to the circuit board is improved. In the present invention, the first convex portion for mounting and the second convex portion for mounting are arranged so as to be displaced in the direction of the second axis. In such a relationship, even if the coil device is downsized, the coil device can be connected to the circuit board without tilting. As a result, the coil device of the present invention is also excellent in thermal shock characteristics.

  Preferably, the first top surface of the first mounting convex portion and the second top surface of the second mounting convex portion are located on substantially the same plane. When such a relationship exists, it becomes easy to connect the coil device on the circuit board without tilting.

  A plate core may be arranged on the opposite side surfaces of the first flange and the second flange where the first mounting protrusion and the second mounting protrusion are formed. By arranging the plate core, a coil device having a closed magnetic circuit can be realized.

Preferably, the first mounting convex portion is located between the pair of first end connection portions formed on the first terminal electrode,
The mounting second convex portion is located between the pair of second end connection portions formed on the second terminal electrode,
The length along the second axis of one of the first end connection portions is longer than the length along the second axis of the other first end connection portion,
The length of the one second end connection portion along the second axis is shorter than the length of the other second end connection portion along the second axis.

  With such an arrangement relationship, it becomes easy to shift the position of the first convex portion and the position of the second convex portion, and the position of the convex portion to be joined by solder or the like such as a circuit board is the first position. The position is shifted between the part and the second collar part. As a result, it becomes easy to connect the coil device on the circuit board without tilting.

  Preferably, the length along the second axis of one of the first end connection portions is substantially the same as the length along the second axis of the other second end connection portion. With such an arrangement relationship, it becomes easy to shift the position of the first convex portion and the position of the second convex portion, and the position of the convex portion to be joined by solder or the like such as a circuit board is the first position. The position is shifted between the part and the second collar part. As a result, it becomes easy to connect the coil device on the circuit board without tilting.

Preferably, in the first terminal electrode, the first terminal connecting portion and the first mounting convex portion are formed in this order along the second axis.
In the second terminal electrode, the second convex portion for mounting and the second terminal connection portion are formed in this order along the second axis.

  With such an arrangement relationship, it becomes easy to shift the position of the first convex portion and the position of the second convex portion, and the position of the convex portion to be joined by solder or the like such as a circuit board is the first position. The position is shifted between the part and the second collar part. As a result, it becomes easy to connect the coil device on the circuit board without tilting.

Preferably, the coil portion is
A first layer first end lead connected to the first terminal electrode and a first terminal connected to the second terminal electrode are wound so that a main part contacts the outer periphery of the core part. A first layer wire having a layer second end lead;
A second layer first end lead connected to the first terminal electrode and a second layer electrode connected to the second terminal electrode are wound so that a main part contacts the outer periphery of the first layer wire. A second layer wire having a two layer second end lead;
A third layer first end lead connected to the first terminal electrode and a second terminal electrode connected to the first terminal electrode are wound so that a main part contacts the outer periphery of the second layer wire. A third layer wire having a third layer second end lead;
A first layer second end lead, a second layer second end lead, and a third layer second end lead are connected to the second terminal electrode in this order along the second axis. Yes,
A third layer first end lead, a first layer first end lead, and a second layer first end lead are connected to the first terminal electrode in this order along the second axis. is there.

  With this configuration, the lead of the plurality of wires is arranged in each terminal electrode in a predetermined order. Therefore, even if the axial length of the core portion is shortened, it is easy to connect to the terminal electrode without crossing the leads of the plurality of wires. Therefore, it is possible to reduce the size of the coil device, and to provide a coil device having excellent impact resistance since leads of a plurality of wires do not intersect at the winding start portion or winding end portion.

Preferably, the second layer wire of the final turn is wound around the outer periphery of the core portion located on the second end side of the first layer wire wound around the core portion,
The third layer wire of the first turn is wound on the outer periphery of the core portion located on the first end side of the first layer wire wound around the core portion,
The final turn third layer wire is formed between the final turn second layer wire and the final turn first layer wire.

  With this configuration, it is possible to reduce the size of the coil device, and to provide a coil device having excellent impact resistance characteristics, in which leads of a plurality of wires do not intersect at the winding start portion or winding end portion. It becomes possible.

Preferably, the first terminal electrode is
The third layer first end lead, the first layer first end lead, and the second layer first end lead are connected to one or more first end connection portions;
The second terminal electrode is
One or more second end connection portions to which the first layer second end lead, the second layer second end lead, and the third layer second end lead are connected are provided.

Preferably, the first convex portion for mounting is located between the first layer first end lead and the second layer first end lead,
The mounting second convex portion is located between the first layer second end lead and the second layer second end lead.

FIG. 1 is a perspective view of a coil device according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which a first-layer wire is wound around the core of the coil device shown in FIG. FIG. 3 is a perspective view showing a state in which the second-layer wire is wound around the outer periphery of the first-layer wire shown in FIG. 4A is a perspective view showing a state in which a third layer wire is wound around the outer periphery of the second layer wire shown in FIG. 4B is a plan view of the coil device shown in FIG. 4A. FIG. 5 is a half sectional view of the main part along the line VV of the coil device shown in FIG. 4B, and shows the winding order of a plurality of wires. FIG. 6 is a circuit diagram showing an application example of the coil device shown in FIGS. FIG. 7 is a side view when the coil device shown in FIGS. 1 to 5 is attached to a circuit board. FIG. 8 is a detailed cross-sectional view of the vicinity of the terminal electrode in the coil device shown in FIGS.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
As shown in FIG. 1, a coil device according to an embodiment of the present invention includes a surface mount type coil component 10. The coil component 10 includes a drum-shaped drum core 20, a plate-shaped plate core 30, and a coil portion 40 that is wound around the core portion 22 of the drum core 20.

  In the description of the coil component 10, the direction parallel to the mounting surface on which the coil component 10 is mounted and parallel to the winding axis of the core portion 22 of the drum core 20 is defined as the X axis (first axis) and the X axis. Similarly, a direction in the plane parallel to the mounting surface and perpendicular to the X-axis is a Y-axis (second axis) direction, and a normal direction of the mounting surface is a Z-axis (third axis) direction.

  The outer dimensions of the coil component 10 are not particularly limited. For example, the width in the Y-axis direction is 2.3 to 2.7 mm, the height in the Z-axis direction is 2.2 to 2.6 mm, and the length in the X-axis direction is It is 3.0-3.4 mm.

  The core of the coil component 10 is configured by combining the drum core 20 and the plate core 30. The drum core 20 includes a rod-shaped core portion 22, a first flange portion 24 provided at a first end of the core portion 22 in the winding axis direction, and a second end (first end) of the core portion 22 in the winding axis direction. And a second flange 25 provided on the opposite side of the first side.

  The outer shapes of the flange portions 24 and 25 may be the same or different, but are preferably the same, and in the present embodiment, are substantially rectangular parallelepipeds. These flange portions 24 and 25 are arranged so as to be substantially parallel to each other with a predetermined interval in the X-axis direction. The winding core portion 22 is connected to a substantially central portion of each surface facing each other in the pair of flange portions 24 and 25, and connects the pair of flange portions 24 and 25. The cross-sectional shape of the winding core portion 22 is a quadrangle in the present embodiment, but may be other polygonal shapes, circular shapes, or oval shapes, and the cross-sectional shape is not particularly limited.

  The plate core 30 is a plate-shaped core, and the outer shape of the plate core 30 is a substantially rectangular parallelepiped whose side in the Z-axis direction is the shortest side. The plate core 30 has a substantially rectangular shape that is long in the X-axis direction when viewed from the normal direction (Z-axis direction) of the upper surface 32, but may be a square or other shapes. The upper surface 32 of the plate core 30 located at both ends in the X-axis direction faces the bottom surfaces 24a and 25a of the flange portions 24 and 25, and is fixed to the bottom surface 24a with an adhesive such as a thermosetting resin. The Thereby, the plate core 30 forms a magnetic path continuous with the drum core 20.

  A first terminal electrode 51 and a second terminal electrode 52 are respectively formed on the installation surfaces 24 b and 25 b (upper Z-axis direction) of the flange portions 24 and 25 of the drum core 20. The method of forming these terminal electrodes 51 and 52 is not particularly limited, and may be formed by baking and / or plating of a printed or applied conductive film, or by bonding metal terminals. May be.

  Each of the terminal electrodes 51 and 52 is provided at least partially on the installation surfaces 24b and 25b of the flange portions 24 and 25 in the Y-axis direction, and the outer end surfaces of the flange portions 24 and 25 in the X-axis direction and the X-axis. It may be provided continuously on the inner end surface in the direction or part of the side surface in the Y-axis direction. The installation surfaces 24 b and 25 b of the flange portions 24 and 25 are the upper surfaces in the Z-axis direction opposite to the bottom surfaces 24 a and 25 a facing the upper surface 32 of the plate core 30.

  The shapes of the terminal electrodes 51 and 52 are matched to the shapes of the installation surfaces 24b and 25b of the flange portions 24 and 25 formed by them, and in this embodiment, they are point-symmetric to each other. The first terminal electrode 51 has first end connection portions 51a1 and 51a2 on both sides in the Y-axis direction, respectively, and between them, the first mounting electrode 51a1 and 51a2 protrude between the connection portions 51a1 and 51a2 in the Z-axis direction. One convex portion 51b is provided.

  In the present embodiment, the top portions in the Z-axis direction of the connection portions 51a1 and 51a2 and the convex portion 51b are preferably formed in a plane, and a taper is provided between the connection portions 51a1 and 51a2 and the convex portion 51b. A part or step is formed. The height of the convex portion 51b in the Z-axis direction with respect to each connection portion 51a1 and 51a2 is higher than the height of the tip connection portion of the first end leads 41α to 43α of the first to third wires 41 to 43 constituting the coil portion 40. It is preferably large, more preferably 0.03 to 0.15 mm.

  4B is preferably 0.3 to 0.5 times the full width y0 of the flange 24 in the Y-axis direction. By setting such a width, stability when the coil component 10 is mounted on a circuit board or the like is improved, and a sufficient width in the Y-axis direction can be secured in each of the connection portions 51a1 and 51a2.

  In the present embodiment, the width in the Y-axis direction of one connection portion 51a1 (also referred to as “the length along the second axis” / hereinafter the same) is greater than the width in the Y-axis direction of the other connection portion 51a2. preferable. One connecting portion 51a1 has a third layer first end lead 43α of the third layer wire 43 and a first layer first end lead 41α of the first layer wire 41 from the back side in the Y-axis direction. They are connected in order. Further, only the second layer first end lead 42α of the second layer wire 42 is connected to the other connection portion 51a2.

  From such a point of view, the width in the Y-axis direction of one connecting portion 51a1 is such that the third layer first end lead 43α and the first layer first end lead 41α are separately provided by means such as thermocompression bonding. A width that can be adhered to the connecting portion 51a1 is preferable. Further, the width of the other connecting portion 51a2 in the Y-axis direction may be a width that allows the single second layer first end lead 42α to be bonded to the connecting portion 51a2 by means such as thermocompression bonding.

  A method for connecting these leads 41α to 43α to the connection portions 51a1 and 51a2 of the terminal electrode 51 is not particularly limited, and in addition to thermocompression bonding, soldering, brazing, laser welding, resistance welding, Examples include arc welding and ultrasonic welding.

  The second terminal electrode 52 is the same as the first terminal electrode 51, the second mounting convex portion 52b corresponds to the first mounting convex portion 51b, and one second end connection portion 52α1 is one first end. Corresponding to the connecting portion 51α1, the other second end connecting portion 52α2 corresponds to the other first end connecting portion 51α2, and the description of the common parts is omitted. Hereinafter, the different parts will be described.

  In the present embodiment, it is preferable that the width in the Y-axis direction of one connection portion 52a1 is smaller than the width in the Y-axis direction of the other connection portion 52a2. Only the first layer second end lead 41β of the first layer wire 41 is connected to one connection portion 52a1. In the other connecting portion 52a2, the second layer second end lead 42β of the second layer wire 42 and the third layer second end lead 43β of the third layer wire 43 are arranged in this order from the back side in the Y-axis direction. It is connected with.

  From such a viewpoint, the width in the Y-axis direction of one connection portion 52a1 is such that only the single first layer second end lead 41β can be bonded to the connection portion 52a1 by means such as thermocompression bonding. I need it. The width of the other connecting portion 52a2 in the Y-axis direction is such that the second layer second end lead 42β and the third layer second end lead 43β are separately bonded to the connecting portion 52a1 by means such as thermocompression bonding. A width as large as possible is preferable.

  The width in the Y-axis direction of the second end connection portion 52a1 is preferably equal to the width in the Y-axis direction of the first end connection portion 51a2 located on the diagonal, but may be slightly different. Further, the width in the Y-axis direction of the second end connection portion 52a2 is preferably equal to the width in the Y-axis direction of the first end connection portion 51a1 located on the diagonal, but may be slightly different.

  As shown in FIG. 1, a coil portion 40 is formed on the core portion 22 of the drum core 20. In the present embodiment, the coil unit 40 includes three or more wires 41 to 43. The wires 41 to 43 are formed of, for example, coated conductors, and have a configuration in which a core material made of a good conductor is covered with an insulating coating film. It is wound with a three-layer structure. An example of the winding method of the wires 41 to 43 will be described.

  As shown in FIG. 2, first, in the first end connection portion 51 a 1 of the first terminal electrode 51 of the first flange portion 24, the first layer wire 41 of the first layer wire 41 is located near the first convex portion 51 b for mounting. The tip of the layer first end lead 41α is connected by means such as thermocompression bonding. After that, the first layer wire 41 is wound around the core portion 22 of the drum core 20 from the vicinity of the first flange portion 24 in the right-handed direction.

  As shown in FIG. 5, the first turn of the third layer wire 43 is later formed on the outer periphery of the winding core portion 22 located between the first turn A <b> 1 that is the start of winding of the first layer wire 41 and the first flange portion 24. Since the turn C1 is wound, at least the first gap 22a in the X-axis direction is formed. The final turn B10 of the second layer wire 42 is later wound around the outer periphery of the winding core portion 22 located between the final turn A10 and the first flange portion 24, which is the end of winding of the first layer wire 41. For this reason, at least the second gap 22b in the X-axis direction is formed. The second gap 22b is preferably larger than the first gap 22a.

  In FIG. 5, only 10 turns from the first turn A1 to the last turn A10 are shown as the main part of the first layer wire 41 wound around the winding core part 22, but the number is limited to 10 turns. It is not a thing and may be more or less. Similarly, in FIG. 5, only 10 turns from the first turn B1 to the last turn B10 are shown as the main part of the second layer wire 42 wound around the winding core part 22, but it is limited to 10 turns. It may be less or more than that. Similarly, in FIG. 5, only 10 turns from the first turn C1 to the last turn C10 are shown as the main part of the third layer wire 43 wound around the winding core part 22, but it is limited to 10 turns. It may be less or more than that.

  After the final turn A10, which is the end of winding of the first layer wire 41, the tip of the first layer second end lead 41β of the first layer wire 41 is one of the second terminal electrodes 52, as shown in FIG. It is pulled out to the second end connection part 52a1, and is connected to the second end connection part 52a1 by thermocompression bonding or the like.

  Next, as shown in FIG. 3, the tip of the second layer first end lead 42α of the second layer wire 42 is heated to the other first end connection portion 51a2 of the first terminal electrode 51 of the first flange portion 24. Connect by means such as crimping. After that, as shown in FIG. 5, the main part of the second layer wire 42 is wound around the outer periphery of the first layer wire 41 wound around the core portion 22 of the drum core 20. The first turn B1 of the second layer wire 42 is preferably wound between the first turn A1 and the second turn A2 of the first layer wire 41 so as to be positioned on them.

  The winding direction of the second layer wire 42 is preferably the same as that of the first layer wire 41. A second gap 22b is formed on the outer periphery of the winding core portion 22 located between the last turn A10, which is the end of winding of the first layer wire 41, and the first flange portion 24, and the winding located at that portion is formed. The second layer wire 42 is wound around the outer periphery of the core portion 22 so that the final turn B10 of the second layer wire 42 is located on the outer periphery of the core portion 22.

  After the final turn B10, which is the end of winding of the second layer wire 42, the tip of the second layer second end lead 42β of the second layer wire 42 is connected to the other end of the second terminal electrode 52, as shown in FIG. It is drawn out to the second end connection portion 52a2, and is connected there to the second end connection portion 52a2 by thermocompression bonding or the like. The end of the second layer second end lead 42β is connected on the side close to the second convex portion 52b in the other second end connecting portion 52a2.

  Next, as shown in FIG. 4A, at one first end connection portion 51a1 of the first terminal electrode 51 of the first collar portion 24, the Y-axis direction is higher than the tip connection portion of the first layer first end lead 41α. The tip of the third layer first end lead 43α of the third layer wire 43 is connected to the inner side by means such as thermocompression bonding. After that, as shown in FIG. 5, the main part of the third layer wire 43 is wound around the outer periphery of the second layer wire 42 wound around the core portion 22 of the drum core 20.

  The first turn C1 of the third layer wire 43 is wound directly on the outer periphery of the core portion 22 at the position of the first gap 22a between the first turn A1 of the first layer wire 41 and the first flange portion 24. It is preferable. The subsequent second turn C2 of the third layer wire 43 is preferably wound from above the first turn B1 and the second turn B2 of the second layer wire 42.

  The winding direction of the third layer wire 43 is preferably the same as that of the second layer wire 42. The last turn C10 of the third layer wire 43 is wound between the last turn A10 that is the end of winding of the first layer wire 41 and the last turn B10 that is the end of winding of the second layer wire 42. It is preferred that

  After the final turn C10, which is the end of winding of the third layer wire 43, the tip of the third layer second end lead 43β of the third layer wire 43 is connected to the other end of the second terminal electrode 52, as shown in FIG. 4A. It is drawn out to the second end connection portion 52a2, and is connected there to the second end connection portion 52a2 by thermocompression bonding or the like. The connection of the tip of the third layer second end lead 43β is performed on the front side in the Y-axis direction with respect to the second layer second end lead 42β in the second end connection portion 52a2.

  In this embodiment, the coil part 40 is formed in the core part 22 of the drum core 20 by such winding operation. Thereafter, the plate core 30 shown in FIG. 1 is joined to the drum core 20 as necessary. As with the drum core 20, the plate core 30 is made of a sintered or molded body of a magnetic material made of Ni—Zn-based ferrite, Mn—Zn-based ferrite, metal magnetic material, or the like.

  The drum core 20 is formed by, for example, molding and sintering a magnetic material composed of a magnetic material having a relatively high magnetic permeability, such as Ni—Zn ferrite, Mn—Zn ferrite, or metal magnetic material. It is produced by.

  In addition, in this embodiment, although the wires 41-43 are all comprised by the wire of the same wire diameter, you may make it differ depending on the case. The wire diameters of the wires 41 to 43 are preferably 0.03 to 0.05 mm.

  As the wires 41 to 43, for example, a core material made of a good conductor such as copper (Cu) is covered with an insulating material made of imide-modified polyurethane and the outermost surface is covered with a thin resin film such as polyester. Can do. The drum core 20 and the wires 41 to 43 provided with the prepared terminal electrodes 51 and 52 are set in a winding machine, and the wires 41 to 43 are wound around the core portion 22 of the drum core 20 in a predetermined order.

  For example, as shown in FIG. 6, the coil component 10 according to the present embodiment is preferably used as an inductor for a power source provided on both sides of a coaxial cable 60 that performs a signal and a current with a single communication line. it can. That is, as shown in FIG. 1, in the coil component 10 of the present embodiment, the three wires 41 to 43 are connected between the terminal electrodes 51 and 52 by multilayer winding, so that the size can be reduced and the cost is high. Inductance and low resistance can be realized simultaneously.

  Further, in the coil component 10 according to the present embodiment, the leads 41α to 43α of the plurality of wires 41 to 43 are arranged on the terminal electrodes 51 and 52 in a predetermined order. Therefore, even if the length of the core part 22 in the X-axis direction is shortened, it is easy to connect to the terminal electrodes 51 and 52 without crossing the leads 41α to 43α of the plurality of wires 41 to 43. Therefore, the coil component 10 can be reduced in size, and at the beginning or end of winding, the leads 41α to 43α of the plurality of wires 41 to 43 do not intersect with each other, and the coil component 10 having excellent impact resistance characteristics can be obtained. It becomes possible to provide.

  Moreover, in the present embodiment, as shown in FIG. 5, on the outer periphery of the core part 22 located on the second flange part 25 side of the final turn A10 of the first layer wire 41 wound around the core part 22, The second layer wire 42 of the final turn B10 is wound. Further, the first turn C1 of the third layer wire 43 is formed on the outer periphery of the core portion 22 located on the first flange portion 24 side of the first turn A1 of the first layer wire 41 wound around the core portion 22. It is wound. Further, the final turn C10 of the third layer wire 43 is formed between the final turn B10 of the second layer wire 42 and the final turn A10 of the first layer wire 1 on them.

  With this configuration, in the present embodiment, the coil component 10 can be reduced in size, and the leads 41α to 43α of the plurality of wires 41 to 43 do not intersect at the winding start portion or the winding end portion. It is possible to provide the coil component 10 having excellent impact resistance characteristics.

  Further, in the present embodiment, as shown in FIG. 1, the first terminal electrode 51 includes a third layer first end lead 43α, a first layer first end lead 41α, and a second layer first end lead 42α. It has the mounting 1st convex part 51b which protrudes with respect to the 1st end connection part 51a1, 51a2 connected. The second terminal electrode 52 includes second end connection portions 52a1 and 52a2 to which the first layer second end lead 41β, the second layer second end lead 42β, and the third layer second end lead 43β are connected. The second convex portion 52b for mounting protrudes with respect to.

  None of the leads 41α to 43α or 41β to 43β is connected to the first mounting convex portion 51b and the second mounting convex portion 52b. Therefore, the surface of the terminal electrode 51 or 52 is not deteriorated by attaching these leads 41α to 43α or 41β to 43β by thermocompression bonding or the like. Therefore, as shown in FIG. 7, the connection strength when these convex portions 51b and 52b are connected to the surface of the circuit board 70 using the solder 72 or the like is improved.

  In particular, as shown in FIG. 8, on the top surface of the protrusion 51b (the same applies to 52b), for example, a plating film 54 of tin or the like remains on the surface of the base electrode film 53, and the solder shown in FIG. The connection strength when connecting to the circuit board 70 is improved. As shown in FIG. 8, in the connection portions 51a1 and 51a2 (same for 52a1 and 52a2) where the leads 41α to 43α (same for 41β to 43β) are connected to the terminal electrode 51 (same for the terminal electrode 52), The plating film 54 disappears or is unevenly distributed due to the influence of pressure bonding or the like.

  As shown in FIG. 7, when the coil component 10 shown in FIG. 1 is mounted on a circuit board or the like, the coil component 10 is turned upside down in the Z-axis direction, that is, the convex portions 51b and 52b are directed downward. Then, the upper surface of the circuit board 70 is connected by soldering or the like.

  Further, in the present embodiment, the first mounting convex portion 51b is located between the first layer first end lead 41α and the second layer first end lead 42α, and the mounting second convex portion 52b is It is located between the first layer second end lead 41β and the second layer second end lead 42β. With such an arrangement relationship, it becomes easy to shift the position of the first convex portion 51b and the position of the second convex portion 52b along the Y axis, and the circuit board 70 shown in FIG. Thus, the positions of the convex portions 51b and 52b to be joined are shifted between the first flange portion 24 and the second flange portion 25.

  That is, in the present embodiment, the first mounting convex portion 51b and the second mounting convex portion 52b are arranged so as to be displaced along the Y-axis direction substantially perpendicular to the winding axis (X-axis) direction. As a result, as shown in FIG. 7, the coil component 10 can be connected to the circuit board 70 in a horizontal state without rotating around the X axis. As a result, the coil component 10 of this embodiment is also excellent in thermal shock characteristics. Incidentally, when the positions of the convex portions 51b and 52b are not displaced in the Y-axis direction, the coil component can easily rotate around the X-axis, and the coil component can be connected to the circuit board 70 in a horizontal state. Prone to become difficult. The coil component connected to the circuit board in an inclined manner is unlikely to have a solder fillet formed on one side, and the reliability life due to thermal shock is shortened.

  Furthermore, in this embodiment, the Z-axis direction first top surface of the first mounting convex portion 51b and the second top surface of the second mounting convex portion 52b have the same height in the Z-axis direction. Located on the same plane. In such a relationship, as shown in FIG. 7, it becomes easy to connect the coil component 10 on the circuit board 70 without tilting.

  Further, in the present embodiment, the plate core 30 is disposed on the opposite side surfaces of the first flange portion 24 and the second flange portion 25 formed with the first mounting convex portion 51b and the second mounting convex portion 52b, respectively. It is. By arranging the plate core 30, the coil component 10 having a closed magnetic circuit can be realized.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention.

  For example, the shape of the drum core 20 is not limited to the drum shape shown in the embodiment, and may be any shape including a pair of core end portions at both ends of the core portion, such as a U shape. Further, the two flange portions 24 of the drum core 20 may have the same shape or different shapes.

  Furthermore, in this embodiment, you may reduce the number of the wires used at the time of winding by devising the winding method of the wire with respect to the winding core part 22. FIG. For example, the first layer of the coil unit 40 (turns A1 to A10 of the first layer wire 41 shown in FIG. 5) is formed on the winding core unit 22 using one wire, and then the coil unit 40 is configured using the same wire. The second layer (the turns B10 to B1 of the second layer wire 42 shown in FIG. 5) may be wound from the opposite direction. Thereafter, the third layer of the coil portion 40 (turns C1 to C10 of the third layer wire 43 shown in FIG. 5) may be formed using the same wire.

  In this case, however, the second layer connected to the terminal electrode 52 is also connected to the tip of the first layer second end lead 41β connected to the terminal electrode 52 shown in FIG. The tip (not shown) of the layer second end lead 42β is connected. Further, the third layer first end lead that is also connected to the terminal electrode 51 at the tip (not shown) of the second layer first end lead 41α connected to the terminal electrode 51 shown in FIG. 4A. The tip of 43α (not shown) is connected. By removing these connecting portions not shown, the same coil component 10 shown in FIG. 4A can be manufactured. Note that the connecting portion may not be removed.

  In the above-described embodiment, the mounting first end convex portion 51b is formed between the pair of first end connection portions 51a1 and 51a2, and between the pair of second end connection portions 52a1 and 52a2. Although the mounting second end protrusion 52b is formed, the present invention is not limited to this. For example, in FIG. 1, the first end connection portion 51a2 that is short in the Y-axis direction is moved to the first end connection portion 51a1 side so that only a single first end connection portion 51a1 is provided. It may be formed only on the near side in the axial direction. In that case, the three leads 43α, 41α, and 42α are connected in this order from the back side in the Y-axis direction to the single first end connection portion 51a1.

  Further, in FIG. 1, the second end connection portion 52a1 that is short in the Y-axis direction is moved to the second end connection portion 52a2 side so that only the single second end connection portion 52a2 is provided, and the mounting second convex portion 52b is defined as Y. You may form only in the back side of an axial direction. In that case, three leads 41β, 42β, and 43β are connected to the single second end connection portion 52a2 in this order from the back side in the Y-axis direction.

  However, in these cases, three thermocompression bondings of the three leads 41α to 42α or 41β to 43β are required for the single connection portion 51a1 or 52a2. For this reason, in order to increase the reliability of thermocompression bonding, as shown in FIG. 1, two or more connecting portions separated by the convex portions 51b or 52b are formed in the respective flange portions 24 or 25. It is preferable.

  Further, in another embodiment of the present invention, the first layer wire 41 and the second layer wire 42 are wound around the core portion 22 in the same direction at the same time by separate wires, and then the third layer wire 43 is wound. These may be wound in the same direction. In another embodiment of the present invention, the fourth and subsequent layers of wire may be wound around the third layer wire 43. Furthermore, in another embodiment of the present invention, the plate core 30 shown in FIG. 1 may be omitted.

  In the above-described embodiment, the coil unit 40 is configured using three or more wires 41 to 43. However, in the present invention, the coil unit 40 may be configured using two or less wires. .

DESCRIPTION OF SYMBOLS 10 ... Coil component 20 ... Drum core 22 ... Core part 22a ... 1st clearance 22b ... 2nd clearance 24 ... 1st collar 24a ... Bottom 24b ... Installation surface 25 ... 2nd collar 25a ... Bottom 25b ... Installation surface 30 ... Plate core 32 ... Upper surface 40 ... Coil portion 41 ... First layer wire 41α ... First layer first end lead 41β ... First layer second end lead 42 ... Second layer wire 42α ... Second layer first end lead 42β ... Second layer second end lead 43 ... Third layer wire 43α ... Third layer first end lead 43β ... Third layer second end lead 51 ... First terminal electrode 51a1, 51a2 ... First end connection portion 51b ... For mounting 1st convex part 52 ... 2nd terminal electrode 52a1, 52a2 ... 2nd end connection part 52b ... 2nd convex part 53 for mounting ... Base electrode film 54 ... Plating film 60 ... Coaxial cable 70 ... Circuit board 72 ... Solder

Claims (6)

A winding core,
A first flange formed at a first end along a first axis parallel to a winding axis direction of the winding core;
A second collar formed at a second end opposite to the first end along the first axis of the core;
A first terminal electrode formed on the first collar;
A second terminal electrode formed on the second collar,
A coil unit comprising at least one wire wound around the outer periphery of the core part,
The first terminal electrode has a first protrusion for mounting projecting with respect to a first end connection portion to which the first end lead of the wire is connected,
The second terminal electrode has a second mounting convex portion protruding with respect to a second end connecting portion to which the second end lead of the wire is connected,
The coil device in which the first convex portion for mounting and the second convex portion for mounting are displaced in the direction of the second axis substantially perpendicular to the first axis.   The coil device according to claim 1, wherein the first top surface of the first mounting convex portion and the second top surface of the second mounting convex portion are located on substantially the same plane.   The plate core is arrange | positioned on the opposite side surface of the said 1st collar part and the said 2nd collar part in which the said 1st convex part for mounting and the said 2nd convex part for mounting are respectively formed. 2. The coil device according to 2. The first mounting convex portion is located between the pair of first end connection portions formed on the first terminal electrode,
The mounting second convex portion is located between the pair of second end connection portions formed on the second terminal electrode,
The length along the second axis of one of the first end connection portions is longer than the length along the second axis of the other first end connection portion,
The coil device according to any one of claims 1 to 3, wherein a length of the one second end connection portion along the second axis is shorter than a length of the other second end connection portion along the second axis. .   5. The coil device according to claim 4, wherein a length along one of the first end connection portions along the second axis is substantially the same as a length along the second axis of the other second end connection portion. In the first terminal electrode, the first terminal connection portion and the first mounting convex portion are formed in this order along the second axis.
The said 2nd terminal electrode and the said 2nd terminal part for mounting and the said 2nd terminal connection part are formed in this order along the said 2nd axis | shaft in the said 2nd terminal electrode. Coil device.

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