JP2011243685A - Coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil component capable of securing a sufficient component accuracy even in a case of downsizing.SOLUTION: A coil component 1 comprises: a main part 8 composing of a green compact which includes a magnetic substance material; a coil 9 arranged internally in the main part 8; a pair of lead wires 2 and 3 respectively drawn outside of the main part 8 from the coil 9; terminal metal fittings 6 and 7 electrically connected with the lead wires 2 and 3 in the outside of the main part 8; and weld parts 11 and 12 which connect the lead wires 2 and 3 with the terminal metal fittings 6 and 7. Each of the pair of lead wires 2 and 3 is drawn toward a first direction D1 which is orthogonal to the axis line direction of the coil 9. Drawing surfaces 21 and 23 of the main part 8 are arranged on the coil 9 side rather than a first side surface 16 which is the end in the first direction D1 of the main part 8. Moreover, the drawing surfaces 21 and 23 intersect with the lead wires 2 and 3 vertically.

Description

  The present invention relates to a coil component.

  2. Description of the Related Art As a conventional coil component, there is known one having a main body configured by a green compact in which a coil is disposed and a pair of lead wires are drawn and a magnetic material is included. The coil component is formed by integrally forming a coil and a green compact. The pair of lead wires are drawn toward the outside of the main body of the coil component. In this coil component, the pair of lead wires are drawn out so as to form an angle of 180 ° with respect to the axial direction of the coil. Since each lead wire forms 180 ° with each other, a bent portion is formed between the winding portion constituting the coil and the lead wire (see, for example, FIG. 9A).

JP 2006-228825 A

  However, the conventional coil component has a configuration in which a pair of lead wires are drawn out in different directions, and needs to be formed so as to bend the lead wires. Therefore, it may be difficult to ensure the lead wire position accuracy. Particularly, in recent years, miniaturization of coil parts has been demanded, and it is required to sufficiently secure the lead wire position accuracy. Furthermore, if the diameter of the lead wire is reduced with downsizing, it becomes difficult to maintain the bent shape. In addition, it has been required to reliably weld the lead wire and the terminal fitting.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a coil component that can sufficiently ensure component accuracy even when downsizing.

  A coil component according to the present invention includes a main body portion formed of a green compact including a magnetic material, a coil disposed inside the main body portion, and a pair of lead wires respectively drawn from the coil to the outside of the main body portion. A terminal fitting connected to the lead wire outside the main body, and the welded portion is formed by welding the lead wire and the terminal fitting, both of the pair of lead wires being in the axial direction of the coil The main body portion has a lead surface from which the lead wire is drawn to the outside, and the lead surface is disposed closer to the coil than the end of the main body portion in the first direction. And perpendicular to the lead wire.

  According to the coil component according to the present invention, the pair of lead wires are both drawn out in the first direction perpendicular to the axial direction of the coil. That is, the pair of lead wires are drawn out in the same direction. In the conventional coil component, since the lead wires are drawn out in different directions at 180 °, it is necessary to form the lead wires so as to be bent, and it is difficult to ensure the positional accuracy of the lead wires. On the other hand, in the configuration of the coil component according to the present invention, since the pair of lead wires are pulled out in the same direction, it is not necessary to form so as to provide a bent portion, and the lead wires can be easily positioned. As a result, it becomes easy to realize miniaturization of the parts. Moreover, in the coil component which concerns on this invention, the extraction surface of the main-body part is arrange | positioned rather than the edge of the 1st direction in a main-body part at the coil side. That is, the lead wire does not protrude outward from the end of the main body portion in the first direction. With such a configuration, the welded portion formed on the lead wire can be disposed within the range of the external dimensions of the main body portion. As a result, it becomes easy to realize miniaturization of the parts. The lead surface intersects with the lead wire perpendicularly. For example, in a configuration in which the lead wire is drawn obliquely from the drawing surface, it is necessary to increase the play of the lead wire between the drawing surface and the welded portion. If the play of the lead wire is large, the shape of the welded portion for connecting the lead wire and the terminal fitting may become unstable. On the other hand, in the configuration in which the lead wire is drawn vertically from the lead surface, it is possible to set the play of the lead wire between the lead surface and the welded portion small. Thus, when the play of a lead wire is set small, the shape of the welding part for connecting a lead wire and a terminal metal fitting will be stabilized. As described above, according to the coil component according to the present invention, the component accuracy can be sufficiently ensured even when the size is reduced.

  In the coil component according to the present invention, the terminal fitting extends along the main surface intersecting the axial direction of the main body, extends along the base piece connected to the main body, and the lead wire, and is welded together with the lead wire. The base piece has an adhesive surface to be bonded to the main surface and a mounting surface to be mounted on an external component on the back side of the adhesive surface, and the weld piece is opposed to the lead wire. It is preferable to have a welding surface. With such a structure, the terminal fitting can sufficiently support the lead wire on the welding surface of the weld piece in a state where the terminal piece is sufficiently fixed to the main body portion in the base piece having the bonding surface. Therefore, in the welding operation for forming the welded portion, the lead wire and the weld piece are welded in a stable state. As a result, welding can be performed so that play of the lead wire between the drawing surface and the welded portion is reduced.

  In the coil component according to the present invention, it is preferable that the weld surface has higher wettability with respect to the material constituting the lead wire than the back surface of the weld surface in the weld piece. For example, when the back surface of the weld surface has a wettability equal to or greater than that of the weld surface, the welded portion may be pulled to the back surface side. In such a case, the shape of the welded portion may not be stable. On the other hand, in the coil component according to the present invention, the weld surface of the weld piece has higher wettability than the back surface. Therefore, the welded portion can be in a stable shape without being pulled to the back side.

  Further, in the coil component according to the present invention, the main body portion has an inclined surface between the end in the first direction and the drawing surface, and the inclined surface is inclined so as to move away from the welded portion toward the first direction. It is preferable. With such a configuration, it is possible to suppress the heat when forming the welded portion from being transmitted to the main body portion via the inclined surface.

  Moreover, in the coil component according to the present invention, it is preferable that the pair of lead wires extend toward the outside of the main body so as to spread each other. With such a configuration, the lead-out surface from which the pair of lead wires are drawn is arranged on the corner side of the main body. The lead-out surface is a surface that is disposed closer to the coil than the end of the main body. Therefore, when the extraction surface is formed near the center position of the main body, the thickness of the coil near the extraction surface may be reduced. In the coil component according to the present invention, since the lead-out surface is disposed closer to the corner, a sufficient thickness for the coil can be ensured.

  In the coil component according to the present invention, it is preferable that the main body portion has an outer dimension defining region that defines an outer dimension, and the welded portion is disposed within the outer dimension defining region. Thus, when the coil component is mounted on an external component, the welded portion can be prevented from interfering with other components.

  In the coil component according to the present invention, it is preferable that the welded portion is separated from the drawing surface. Thereby, it can suppress that the heat at the time of forming a welding part is transmitted to a main-body part via a drawer | drawing-out surface.

  According to the present invention, sufficient component accuracy can be ensured even when downsizing is attempted.

It is a perspective view of the coil component which concerns on embodiment of this invention. It is the perspective view which looked at the coil components which concern on embodiment of this invention from the terminal metal fitting side. It is the top view which looked at the coil components shown in FIG. 1 from the axial direction of the coil. It is a perspective view which shows the terminal metal fitting in the state connected to the lead frame. It is a perspective view which shows the back surface side of the terminal metal fitting in the state connected to the lead frame. It is a flowchart which shows the manufacturing method of the coil components which concern on embodiment of this invention. It is a perspective view which shows the manufacturing method of the coil components which concern on embodiment of this invention. It is a schematic sectional drawing for demonstrating the process from bonding process S4 to welding process S7. It is a figure for demonstrating the effect | action and effect of the coil components which concern on embodiment of this invention. It is a schematic sectional drawing for demonstrating the effect | action and effect of the coil components which concern on embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  The configuration of the coil component 1 according to the embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. 1 is a perspective view of a coil component according to an embodiment of the present invention. FIG. 2 is a perspective view of the coil component according to the embodiment of the present invention as viewed from the terminal fitting side. FIG. 3 is a plan view of the coil component shown in FIG. 1 as viewed from the axial direction of the coil. FIG. 3 shows the coil 9 by breaking the main body 8 in the left half region of the drawing.

  As shown in FIGS. 1, 2, and 3, the coil component 1 includes a molded body 4 from which the lead wires 2 and 3 are drawn, and terminal fittings 6 and 7 attached to the molded body 4. It is configured. Further, the welded portion 11 is formed by welding the lead wire 2 and the terminal fitting 6, and the welded portion 12 is formed by welding the lead wire 3 and the terminal fitting 7. The molded body 4 includes a main body portion 8 made of a green compact containing a magnetic material, a coil 9 disposed inside the main body portion 8, and a pair of leads drawn out from the coil 9 to the outside of the main body portion 8. Lines 2 and 3 are provided. The molded body 4 is configured by arranging a coil in magnetic powder and integrally molding it. The terminal fitting 6 is bonded to the molded body 4 and is electrically connected to the lead wire 2 exposed to the outside via the welded portion 11. The terminal fitting 7 is bonded to the molded body 4 and is electrically connected to the lead wire 2 exposed to the outside via the welded portion 12.

  The magnetic material composing the main body 8 is, for example, ferrite powder or ferromagnetic metal powder. The main body 8 has a flat, substantially rectangular shape, and the external dimensions are set to about 2.5 to 5 mm in length, 2.5 to 5 mm in width, and about 1.0 to 2.0 mm in height. . The main body 8 has a first main surface 13 and a second main surface 14 that face each other in the thickness direction, and a first side surface 16 that is orthogonal to the first main surface 13 and the second main surface 14 and faces each other. A third side surface 18 and a fourth side surface 19, which have a second side surface 17, are orthogonal to the first main surface 13 and the second main surface 14, and are orthogonal to the first side surface 16 and the second side surface 17. Have Here, the following description will be given with the direction from the second side surface 17 toward the first side surface 16 being the first direction D1. Thus, when the 1st direction D1 is defined, the 1st side 16 corresponds to the end of the 1st direction D1 in the main-body part 8. FIG.

  The main body 8 has a shape that is cut out at a corner between the first side surface 16 and the third side surface 18. Specifically, the main body 8 has a lead surface 21 and an inclined surface 22 that are orthogonal to the first main surface 13 and the second main surface 14 between the first side surface 16 and the third side surface 18. . The lead surface 21 has a function of pulling the lead wire 2 outward. The lead-out surface 21 is connected to the third side surface 18 perpendicularly and is parallel to the first side surface 16 and the second side surface 17. In addition, the drawing surface 21 is arranged on the coil 9 side, that is, on the second side surface 17 side with respect to the first side surface 16 that is an end in the first direction D1 of the main body portion 8. The inclined surface 22 is provided between the first side surface 16 and the drawing surface 21. The inclined surface 22 is inclined so that the main body 8 is tapered from the drawing surface 21 toward the first direction D1. When the position of the welded portion 11 described later is used as a reference, the inclined surface 22 is inclined so as to move away from the lead wire 2, that is, the welded portion 11, as it goes in the first direction D1.

  The main body 8 has a shape that is cut out at a corner between the first side surface 16 and the fourth side surface 19. Specifically, the main body 8 has a drawing surface 23 and an inclined surface 24 that are orthogonal to the first main surface 13 and the second main surface 14 between the first side surface 16 and the fourth side surface 19. . The lead surface 23 has a function of pulling the lead wire 3 outward. The lead-out surface 23 is connected to the fourth side surface 19 in a vertical direction, and is parallel to the first side surface 16 and the second side surface 17. Further, the drawing surface 23 is disposed on the coil 9 side, that is, on the second side surface 17 side with respect to the first side surface 16 that is an end of the main body portion 8 in the first direction D1. The inclined surface 24 is provided between the first side surface 16 and the drawing surface 23. The inclined surface 24 is inclined so that the main body 8 is tapered from the drawing surface 23 toward the first direction D1. When the position of the welded portion 11 to be described later is used as a reference, the inclined surface 24 is inclined so as to move away from the lead wire 3, that is, the welded portion 12 as it goes in the first direction D1.

  As shown in FIG. 3, the coil 9 is configured by winding a winding around a central axis L1 (extending in the direction perpendicular to the paper surface in FIG. 3). The coil 9 is arranged such that the central axis L <b> 1 coincides with the thickness direction in the main body portion 8. That is, the axial direction of the coil 9 is orthogonal to the first direction D1. Further, the central axis L1 is arranged at the center position in the external dimension region of the main body 8 when viewed from the thickness direction. Of the windings of the coil 9, one end is drawn out to the outside of the main body 8 as a lead wire 2, and the other end is drawn out to the outside of the main body 8 as a lead wire 3. The lead wire 2 and the lead wire 3 are both drawn out in the first direction D1. That is, the lead wire 2 and the lead wire 3 are both drawn out in the direction from the second side surface 17 toward the first side surface 16. The lead wire 2 extends toward the extraction surface 21 along the third side surface 18, and is extracted to the outside of the main body portion 8 by the extraction surface 21. The lead wire 3 extends toward the drawing surface 23 along the fourth side surface 19, and is drawn to the outside of the main body portion 8 by the drawing surface 23. Between the lead wire 2 and the coil 9 winding, that is, the portion where the lead wire 2 is out of the winding direction of the coil 9 (the portion indicated by BP1 in FIG. 3) is the lead wire 3 and the coil 9 winding. Are 180 ° out of phase.

  Further, the lead wire 2 is drawn out so as to intersect the drawing surface 21 perpendicularly. The lead wire 3 is drawn out so as to intersect the drawing surface 23 perpendicularly. The term “vertical” used here includes not only a completely vertical state but also a vertical one within a range of errors that occur during manufacturing. Further, the lead wire 2 and the lead wire 3 extend so as to spread from the coil 9 toward the first direction D1. That is, when the center line between the third side face 18 and the fourth side face 19 is L2, the lead wire 2 is moved away from the center line L2 in the first direction D1 from the coil 9 and approaches the third side face 18. It extends like so. On the other hand, the lead wire 3 extends away from the center line L <b> 2 in the first direction D <b> 1 from the coil 9 and approaches the fourth side surface 19. Further, the lead wire 2 is drawn smoothly without being bent between the winding portions of the coil 9 wound in a circle (portion indicated by BP1 in FIG. 3). That is, the lead wire 2 has a shape close to a tangent to the coil 9 at a portion BP1 away from the winding portion of the coil 9. The same applies to the lead wire 3.

  The tip of the lead wire 2 has a welded portion 11 by being welded to the terminal fitting 6. The tip of the lead wire 3 has a welded portion 12 by being welded to the terminal fitting 7. The welded portion 11 and the welded portion 12 are disposed in the outer dimension defining region OE of the main body portion 8. Here, the external dimension defining region OE is a hexahedral region set in order to define the vertical, horizontal, and length external dimensions of the main body 8. When designing a product using the coil component 1, a design based on the outer dimension defined by the outer dimension defining region is performed. In the present embodiment, the external dimension defining region OE includes a flat surface including the first main surface 13, a flat surface including the second main surface 14, a flat surface including the first side surface 16, and a second side surface 17. Defined by an area surrounded by a plane extending including the third side face 18 and a plane extending including the fourth side face 19. In the present embodiment, the lead-out surfaces 21 and 23 and the inclined surfaces 22 and 24 are disposed in the outer dimension defining region OE. In FIG. 3, among the six planes defining the outer dimension defining region OE, a part of the plane parallel to the central axis L <b> 1 of the coil 9 is indicated by a dotted line. That is, a plane F1 that extends including the first side face 16, a plane F3 that extends including the third side face 18, and a plane F4 that extends including the fourth side face 19 are described. The welded portion 11 is disposed closer to the coil 9 than the plane F1 (first side surface 16) and closer to the coil 9 than the plane F3 (third side surface 18). Further, the welded portion 12 is disposed closer to the coil 9 than the plane F1 (first side surface 16) and closer to the coil 9 than the plane F4 (fourth side surface 19). As is clear from FIGS. 1 and 2, the welded portions 11 and 12 are disposed between the first main surface 13 and the second main surface 14, and are also disposed within the external dimension defining region OE in the thickness direction. Is done. The welded portion 11 and the welded portion 12 are separated from the lead surfaces 21 and 23. Specifically, in FIG. 3, the dimension of the portion indicated by S1 is preferably about 0.05 to 0.1 mm.

  FIG. 4 is a perspective view showing the terminal fitting in a state of being connected to the lead frame. FIG. 5 is a perspective view showing the back side of the terminal fitting in a state of being connected to the lead frame. At the time of manufacture, the terminal fittings 6 and 7 are bonded and welded to the molded body 4 while being connected to the lead frame LF. As shown in FIGS. 1, 2, 4, and 5, the terminal fitting 6 extends along the second main surface 14 that intersects the central axis L <b> 1 in the main body 8 and is connected to the main body 8. And a weld piece 32 that extends along the lead wire 2 and is welded together with the lead wire 2, and a connecting piece 33 that connects the base piece 31 and the weld piece 32. The base piece 31 is a plate member having an L-shaped cross section, and has a bottom portion 34 that contacts the second main surface 14 and a side portion 36 that faces the third side surface 18. The connecting piece 33 is a belt-like member having an L-shaped cross section, and extends along the drawing surface 21 from the bottom 34 to the horizontal portion 37 extending horizontally in the first direction D1 and from the end of the horizontal portion 37 toward the weld piece 32. A vertical portion 38 extending vertically. The bottom 34 of the base piece 31 has an adhesive surface 34a that is bonded to the second main surface, and has a mounting surface 34b that is mounted on an external component (such as a substrate) on the back side of the adhesive surface 34a. The weld piece 32 has a weld surface 32 a facing the lead wire 2. The terminal fitting 7 extends along the second main surface 14 intersecting the central axis L <b> 1 in the main body 8, extends along the base piece 41 connected to the main body 8, the lead wire 3, and is welded together with the lead wire 3. And a connecting piece 43 that connects the base piece 41 and the welding piece 42. The base piece 41 is a plate member having an L-shaped cross section, and has a bottom portion 44 that contacts the second main surface 14 and a side portion 46 that contacts the fourth side surface 19. The connecting piece 43 is a belt-like member having an L-shaped cross section, and extends along the lead-out surface 23 from the bottom 44 to the horizontal portion 47 extending horizontally in the first direction D1 and from the end of the horizontal portion 47 toward the weld piece 42. A vertical portion 48 extending vertically. The bottom 44 of the base piece 41 has an adhesive surface 44a that is bonded to the second main surface, and has a mounting surface 44b that is mounted on an external component (board or the like) on the back side of the adhesive surface 44a. The weld piece 42 has a weld surface 42 a facing the lead wire 3.

  The surfaces of the terminal fittings 6 and 7 have different wettability depending on places. The wettability is wettability with respect to the material constituting the lead wires 2 and 3. Specifically, the welding surfaces 32 a and 42 a of the weld pieces 32 and 42, the mounting surfaces 34 b and 44 b of the bottom portions 34 and 44 of the base pieces 31 and 41, the main body portion 8 on the side portions 36 and 46 of the base pieces 31 and 41, The surface on the opposite side to the main body 8 in the horizontal portions 37 and 47 and the vertical portions 38 and 48 of the connecting pieces 33 and 43 is a surface that is plated and has high wettability. . As the plating, for example, Ni plating with a thickness of about 0.5 μm or Sn plating with a thickness of about 5 μm is used. In addition, Sn plating is formed on Ni plating, and the outermost case becomes Sn plating. On the other hand, the back surfaces 32b and 42b of the weld surfaces 32a and 42a of the weld pieces 32 and 42, the adhesion surfaces 34a and 44a of the bottom portions 34 and 44 of the base pieces 31 and 41, and the main body portions on the side portions 36 and 46 of the base pieces 31 and 41 8 and the surfaces facing the main body 8 in the horizontal portions 37 and 47 and the vertical portions 38 and 48 of the connecting pieces 33 and 43 are exposed copper surfaces and have low wettability. Yes (the hatched portion in FIGS. 4 and 5). Thereby, the welding surfaces 32a and 42a of the weld pieces 32 and 42 have higher wettability than the back surfaces 32b and 42b. Further, the mounting surfaces 34b and 44b of the bottom portions 34 and 44 of the base pieces 31 and 41 have high wettability and are easy to mount on other components. The adhesion surfaces 34a and 44a of the bottom portions 34 and 44 of the base pieces 31 and 41 have a low wettability because the copper surfaces are exposed, and the main body portion 8 is easily adhered. Note that at least the welding surfaces 32a and 42a and the mounting surfaces 34b and 44b are plated surfaces, and at least the back surfaces 32b and 42b (particularly the portion where the welded portions 11 and 12 on the tip side are formed) and the bonding surfaces 34a and 44a are copper surfaces. The other part may be plated or copper.

  Next, the manufacturing method of the coil component 1 is demonstrated with reference to FIG.6, FIG.7 and FIG.8.

  First, as shown in FIG. 6, the winding step S1 is performed. As shown in FIG. 7A, the winding step S1 is a step of forming the coil 9 by winding the winding and pulling out the lead wires 2 and 3. Next, a main body portion forming step S2 for forming the main body portion 8 is performed. The main body portion forming step S2 is a step of forming the main body portion 8 by integrally molding a magnetic material together with the coil 9. The molded body 4 as shown in FIG. 7A is formed by performing the winding step S1 and the main body forming step S2. That is, the winding step S1 and the main body forming step S2 constitute a step of preparing the main body 8 in which the coil 9 is arranged and the lead wires 2 and 3 are drawn out.

  Next, terminal fitting preparation step S3 is performed. The terminal fitting preparation step S3 is a step of forming the terminal fittings 6 and 7 connected to the lead frame LF by pressing or the like and plating the surfaces of the terminal fittings 6 and 7 (see FIGS. 4 and 5). Next, bonding process S4 is performed. The bonding step S4 is a step of bonding the terminal fittings 6 and 7 to the molded body 4. In the bonding step S4, an adhesive is applied to the bonding surfaces 34a and 44a of the terminal fittings 6 and 7, and the bonding surfaces 34a and 44a are bonded to the main body 8 of the molded body 4 as shown in FIG. It is done. In the bonding step S4, the terminal fittings 6 and 7 with the lead frame LF are bonded to the molded bodies 4 arranged and fixed in a row. Alternatively, the molded body 4 may be bonded to the fixed terminal fittings 6 and 7.

  Next, pressure application process S5 is performed. The pressure applying step S5 is a step in which the lead wires 2 and 3 and the weld pieces 32 and 42 of the terminal fittings 6 and 7 are pressed. Next, cutting process S6 is performed. The cutting step S6 is a step of cutting an excessively long portion of the lead wires 2 and 3. Next, welding process S7 is performed. As shown in FIG. 7C, the welding step S7 is a step of forming welds 11 and 12 at the tips of the lead wires 2 and 3. As shown in FIG. That is, in the welding step S7, the pressed portions of the lead wires 2 and 3 and the weld pieces 32 and 42 of the terminal fittings 6 and 7 are welded.

  Here, the process of bonding process S4-welding process S7 is demonstrated in detail using FIG. 8 shows only the state of the lead wires 3 among the lead wires 2 and 3, the same processing is performed on the lead wire 2 side. As shown in FIG. 8A, in the bonding step S4, the bonding surface 44a of the terminal fitting 7 is bonded to the second main surface 14 of the main body 8 via an adhesive. At this time, the lead wire 3 is placed on the welding surface 42 a of the welding piece 42 of the terminal fitting 7. Next, as shown in FIG. 8B, in the pressure application step S <b> 5, the lead wire 3 is pressed against the welding surface 42 a of the welding piece 42 of the terminal fitting 7. Specifically, the back surface 42b of the terminal fitting 7 is supported by the upper surface of the pressure application tool PA1, and the lead wire 3 is pressed by the pressure application tool PA2 from above. As a result, the lead wire 3 and the weld piece 42 are sandwiched between the pressure application tool PA1 and the pressure application tool PA2. A pressure applying portion 50 is formed at a portion where the lead wire 3 and the weld piece 42 are sandwiched. In the pressure application part 50, the lead wire 3 and the welding piece 42 are flattened flattened as compared with other parts. The “pressure applying unit 50” includes not only the position of direct contact with the pressure applying tools PA1 and PA2, but also the vicinity of the contact position. That is, the “pressure applying unit 50” includes a region that is pulled and deformed by the pressing force even if it is not in contact with the pressure applying tools PA1 and PA2 (for example, a portion indicated by 50a in FIG. 8). .

  Next, as shown in FIG. 8C, in the cutting step S6, the lead wire 3 is cut by the cutting tool CA. Specifically, the lead wire 3 is cut by the cutting tool CA in a state where the lead wire 3 and the weld piece 42 are sandwiched between the pressure applying tools PA1 and PA2. The cutting tool CA cuts the distal end side of the lead wire 3 from the pressure applying unit 50. At this time, the cut portion 3 a of the lead wire 3 covers the end face 42 c of the weld piece 42. That is, by cutting with the cutting tool CA, the cutting portion 3a of the lead wire 3 is pulled along the cutting direction and enters the weld piece 42 side. Thereby, even before welding, the positional relationship between the lead wire 3 and the welded piece 42 is fixed by the cutting portion 3a (it is in a state of temporary fixing). Although FIG. 8C shows a state in which only the lead wire 3 is cut, a part of the weld piece 32 may be cut simultaneously with the lead wire 3. When the weld piece 32 and the lead wire 3 are cut simultaneously, the cut portion 3a that covers the end face of the weld piece 32 becomes larger. Next, as shown in FIG. 8D, in the welding step S <b> 7, the laser welding apparatus LA irradiates the lead wire 3 and the pressure application portion 50 of the weld piece 42 with laser. As a result, the weld portion 12 that connects the lead wire 3 and the weld piece 42 is formed in the pressure applying portion 50. In addition, since heat is added to the position irradiated with laser by the laser welding apparatus LA, the heat is transmitted to the main body 8 side. Accordingly, as indicated by an arrow PD in FIG. 8D, the welded portion 12 moves to the main body portion 8 side from the laser irradiation position with heat transfer. As a result, the welded portion 12 can be reliably positioned within the outer dimension defining region OE of the main body portion 8. The laser irradiation position is not particularly limited, and can be any position on the pressure applying portion 50 as long as the welded portions 11 and 12 can be finally disposed in the outer dimension defining region OE of the main body portion 8. May be. For example, the laser may be applied to the tip side (that is, a position close to the cutting portion) of the pressure applying unit 50, or the base side of the pressure applying unit 50 (that is, a position close to the main body unit 8, such as the region 50a). May be irradiated. When the laser is irradiated on the base side of the pressure applying unit 50, the lead wires 2 and 3 and the weld pieces 32 and 42 on the tip side from the laser irradiation position are cut.

  Here, since the lead wire 2 and the lead wire 3 are drawn out in the first direction D1, which is the same direction, the position where the welded portion 11 is formed and the position where the welded portion 12 is formed are arranged in a horizontal line. It becomes. Therefore, between the lead wire 2 and the weld piece 32, and between the lead wire 3 and the weld piece 42, pressure is applied by one operation using one pressure application tool PA1 and one pressure application tool PA2. It can be carried out. Moreover, it can cut | disconnect by one operation | movement using one cutting tool CA. Further, in the present embodiment, since a plurality of terminal fittings 6 and 7 are connected to the lead frame LF, a plurality of main body portions 8 can be arranged in a horizontal row as shown in FIG. Accordingly, pressure is applied to the plurality of coil parts 1 by one operation using one pressure applying tool PA1 and one pressure applying tool PA2, and cutting operation is performed by one operation using one cutting tool CA. It can be carried out. Further, since the laser welding apparatus LA can form the welded portion of each coil component 1 only by moving in the lateral direction, it is possible to reduce the calculation load for positioning during welding.

  Returning to FIG. 7C, after the welding step S7, a lead frame cutting step S8 is performed. In the lead frame cutting step S <b> 8, the lead frame LF that connects the plurality of terminal fittings 6, 7 is separated from each terminal fitting 6, 7. Thereby, each coil component 1 becomes an independent component. When the lead frame cutting step S8 is executed, the manufacturing process shown in FIG. 6 is completed.

  Next, the operation and effect of the coil component 1 according to the present embodiment and the manufacturing method thereof will be described.

  According to the coil component 1 according to the present embodiment, the pair of lead wires 2 and 3 are both drawn toward the first direction D1 orthogonal to the axial direction of the coil 9. That is, the pair of lead wires 2 and 3 are drawn out in the same direction. Here, the configuration of the conventional coil component shown in FIG. 9A will be described. A coil portion 109 in a conventional coil component has lead wires 102 and 103 that are pulled out in different directions at an angle of 180 °. Further, the portion between the lead wire 102 and the coil 9 winding (portion indicated by BP2 in FIG. 9) is 180 ° between the lead wire 103 and the coil 9 winding portion. It is in phase. Accordingly, a bent portion is formed at a portion between the lead wire 102 and the lead wire 103 and the winding of the coil 9. When forming the lead wires 102 and 103 to be bent, it may be difficult to ensure the positional accuracy of the lead wires 102 and 103. Such a problem is particularly likely to occur when the coil component is downsized. Further, as the diameters of the lead wires 102 and 103 become smaller as the size is reduced, it becomes difficult to maintain the bent shape. On the other hand, in the configuration of the coil component 1 according to the embodiment, since the pair of lead wires 2 and 3 are drawn out in the same direction, as shown by BP1 in FIG. There is no need to bend between them. In this way, forming such as providing a bent portion is not necessary, and positioning of the lead wires 2 and 3 is facilitated. As a result, it becomes easy to realize miniaturization of the parts.

  Further, in the coil component 1 according to the present embodiment, the lead-out surfaces 21 and 23 of the main body portion 8 are disposed closer to the coil 9 than the first side surface 16 that is an end of the main body portion 8 in the first direction D1. That is, the lead wires 2 and 3 do not protrude outward from the first side surface 16 that is an end of the main body portion 8 in the first direction D1. With such a configuration, the welded portions 11, 12 formed on the lead wires 2, 3 can be arranged within the range of the external dimension defining region OE of the main body portion 8. As a result, it becomes easy to realize miniaturization of the parts. The lead surfaces 21 and 23 intersect the lead wires 2 and 3 perpendicularly. For example, as shown in FIG. 9B, in the configuration in which the lead wire 3 is drawn obliquely from the drawing surface 23, it is necessary to increase the play of the lead wire 3 between the drawing surface 23 and the welded portion 12. Occurs. Specifically, in order to secure only the distance S1 between the welded portion 12 and the lead-out surface 23, an extra play indicated by S2 in FIG. 9B is required. When the play of the lead wires 2 and 3 is large, the shapes of the welded portions 11 and 12 for connecting the lead wires 2 and 3 and the terminal fittings 6 and 7 may become unstable. For example, as shown in FIG. 9D, there is a possibility that the welded portions are easily separated from each other. On the other hand, in the configuration in which the lead wires 2 and 3 are drawn vertically from the lead surfaces 21 and 23, the play of the lead wires 2 and 3 between the lead surfaces 21 and 23 and the welded portions 11 and 12 is set small. It becomes possible. Specifically, as shown in FIG. 9C, it is not necessary to provide extra play in order to ensure the distance between the welded portion 12 and the drawing surface 23 by S1. Thus, when the play of the lead wires 2 and 3 is set small, the shapes of the welded portions 11 and 12 for connecting the lead wires 2 and 3 and the terminal fittings 6 and 7 are stabilized. As described above, according to the coil component 1 according to the present embodiment, the component accuracy can be sufficiently ensured even when the size is reduced.

  Further, in the coil component 1 according to the present embodiment, the terminal fittings 6 and 7 extend along the second main surface 14 in the main body 8 and are connected to the base pieces 31 and 41 connected to the main body 8 and the lead wire 2. , 3, and welded pieces 32, 42 welded together with the lead wires 2, 3. The base pieces 31 and 41 have bonding surfaces 34a and 44a bonded to the second main surface 14 and mounting surfaces 34b and 44b mounted on external components on the back side of the bonding surfaces 34a and 44a. Yes. The weld pieces 32, 42 have weld surfaces 42 a, 32 a facing the lead wires 2, 3. With such a structure, the terminal fittings 6 and 7 are welded on the welded surfaces 32a and 42a of the welded pieces 32 and 42 with the base pieces 31 and 41 having the bonding surfaces 34a and 44a being sufficiently fixed to the main body portion 8. The lead wires 2 and 3 can be sufficiently supported. Therefore, in the welding operation for forming the welded portions 11 and 12, the lead wires 2 and 3 and the weld pieces 32 and 42 are welded in a stable state. This makes it possible to perform welding so that play of the lead wires 2 and 3 between the lead surfaces 21 and 23 and the welded portions 11 and 12 is reduced.

  Moreover, in the coil component 1 which concerns on this embodiment, the welding surfaces 32a and 42a have higher wettability than the back surfaces 32b and 42b in the welding pieces 32 and 42. FIG. For example, when the back surfaces 32b and 42b have wettability equivalent to or higher than the weld surfaces 32a and 42a, the welded portions 11 and 12 may be pulled toward the back surfaces 32b and 42b. In such a case, the shape of the welds 11 and 12 may not be stable. Specifically, as shown in FIG. 10B, when the plating MF is formed not only on the weld surface 42a of the weld piece 42 but also on the entire back surface 42b, the wettability of the back surface 42b is determined by the weld surface 42a. It becomes equivalent to the wettability. In such a case, the welding part 12 will be pulled by the back surface 42b side. On the other hand, in the coil component 1 according to the present embodiment, the weld surfaces 32a and 42a of the weld pieces 32 and 42 have higher wettability than the back surfaces 32b and 42b. Therefore, the welded portions 11 and 12 can be in a stable shape without being pulled toward the back surfaces 32b and 42b. Specifically, as shown in FIG. 10A, the plating MF is formed only on the welding surface 42a of the weld piece 42, and is not formed on the tip side of the back surface 42b. Thereby, the wettability of the welding surface 42a becomes higher than the wettability of the back surface 42b. Accordingly, the welded portion 12 can maintain a stable shape without being pulled toward the back surface 42b. In addition, in the range which does not pull the welding part 12, plating MF may be formed in the root side in the back surface 42b. In this way, by allowing some plating to be formed on the back surface, the alignment work during plating can be facilitated.

  Moreover, in the coil component 1 according to the present embodiment, the main body 8 has the inclined surfaces 22 and 24 between the first side surface 16 that is the end in the first direction D1 and the extraction surfaces 21 and 23, and the inclined surface 22 and 24 incline so that it may distance from the welding parts 11 and 12 as it goes to the 1st direction D1. With such a configuration, it is possible to suppress the heat when the welded portions 11 and 12 are formed from being transmitted to the main body portion 8 through the inclined surfaces 22 and 24.

  Moreover, in the coil component 1 which concerns on embodiment, a pair of lead wires 2 and 3 are extended toward the outer side of the main-body part 8 so that it may spread mutually. With such a configuration, the lead surfaces 21 and 23 from which the pair of lead wires 2 and 3 are pulled out are arranged on the corner side of the main body 8. The lead surfaces 21 and 23 are surfaces that are disposed closer to the coil 9 than the first side surface 16 that is the end of the main body 8 in the first direction D1. Therefore, when the lead wires 2 and 3 are pulled out near the central position of the main body 8, the lead surfaces 21 and 23 are formed near the central position of the main body 8. When the drawing surfaces 21 and 23 are formed near the center position of the main body 8, the thickness of the coil 9 near the drawing surfaces 21 and 23 may be reduced. Specifically, as shown by a two-dot chain line in FIG. 3, when the drawing surface 23 spreads to the center side, the thickness between the coil 9 and the drawing surface 23 in the vicinity of the drawing surface 23 is T1. It will be as thin as shown. In the coil component 1 according to the present embodiment, since the lead surfaces 21 and 23 are arranged closer to the corners, a sufficient thickness with respect to the coil 9 can be ensured.

  In the coil component 1 according to the present embodiment, the main body 8 has an outer dimension defining region OE that defines outer dimensions, and the welded portions 11 and 12 are disposed in the outer dimension defining region OE. . Thus, when the coil component 1 is mounted on an external component, it is possible to prevent the welds 11 and 12 from interfering with other components. Further, by performing the welding operation so that the welded portions 11 and 12 are disposed between the lead surfaces 21 and 23 and the first side surface 16, the play of the lead wires 2 and 3 can be reduced and a stable operation can be performed. Can do.

  In the coil component 1 according to the present embodiment, the welded portions 11 and 12 are separated from the lead surfaces 21 and 23. Thereby, it can suppress that the heat at the time of forming the welding parts 11 and 12 is transmitted to the main-body part 8 via the drawing-out surfaces 21 and 23. FIG.

  In the manufacturing method of the coil component 1 which concerns on this embodiment, the lead wires 2 and 3 and the welding pieces 32 and 42 are mutually pressed, and are welded in the pressure provision part 50 to which the said pressure was provided. For example, in the conventional coil component, as shown in FIG. 9D, the lead wire 3 and the weld piece 42 are separated from each other, and the welded portion may be separated. However, in the coil component 1 according to the present embodiment, the lead wires 2 and 3 and the weld pieces 32 and 42 are welded in a securely fixed state. Therefore, separation of the lead wires 2 and 3 after welding and the terminal fittings 6 and 7 is reliably prevented, and connectivity between the lead wires 2 and 3 and the terminal fittings 6 and 7 is ensured. . Further, the lead wires 2 and 3 and the terminal fittings 6 and 7 can be fixed by a simple operation of simply pressing the lead wires 2 and 3 and the terminal fittings 6 and 7. In the present embodiment, the lead wires 2 and 3 can be fixed to the terminal fittings 6 and 7 only by reciprocating the pressure applying tool PA2 once in the vertical direction. Therefore, such a pressure application operation is a caulking operation for caulking a part of the terminal fittings 6 and 7 with respect to the lead wires 2 and 3 (impossible by the operation only in the vertical direction of the tool). As compared with the case where the lead wires 2 and 3 are wound around the terminal fittings 6 and 7, the work operation can be greatly simplified, and the structure and operation of the manufacturing apparatus can be simplified. As described above, the manufacturing work efficiency can be improved and the reliability of the components can be improved.

  Moreover, in the manufacturing method of the coil component 1 which concerns on this embodiment, the cutting process S6 which cuts the lead wires 2 and 3 in the state which pressed the lead wires 2 and 3 and the welding pieces 32 and 42 is further provided. Thereby, the cutting operation of the lead wires 2 and 3 can be performed reliably and easily.

  Moreover, in the manufacturing method of the coil component 1 which concerns on this embodiment, a pair of lead wires 2 and 3 are pulled out from the main-body part 8, and a pair of lead wires 2 and 3 are all toward the 1st direction D1. Has been pulled out. In this way, by pulling out the pair of lead wires 2 and 3 in the same direction, in the pressure application step S5, both lead wires 2 can be operated in one operation using one pressure application tool PA1 and one pressure application tool PA2. , 3 can be applied with pressure. Thereby, working efficiency can be improved.

  In the method for manufacturing the coil component 1 according to the present embodiment, the cut portions of the lead wires 2 and 3 cover the end faces of the weld pieces 32 and 42. Thereby, the lead wires 2 and 3 and the weld pieces 32 and 42 can be more firmly fixed.

  Moreover, in the manufacturing method of the coil component 1 which concerns on this embodiment, the lead frame LF in which the several terminal metal fittings 6 and 7 were formed is prepared in terminal metal fitting preparation process S3. Thereby, it is possible to process a plurality of coil components 1 at a time, and it is possible to perform the pressure applying step S5, the cutting step S6, and the welding step S7 at a time.

  The present invention is not limited to the embodiment described above.

  For example, although the inclined surface is formed between the drawing surface and the first side surface 16, a surface perpendicular to the drawing surface and the first side surface 16 may be formed. Moreover, although the 1st side surface 16 was formed as an edge of the main-body part 8 in the 1st direction D1, the said edge does not need to be a surface. In other words, any shape may be used as long as it can define the outer dimension defining region of the main body 8. For example, you may comprise the triangle which the inclined surface 22 and the inclined surface 24 directly connected. At this time, the top of the triangle corresponds to the end of the main body 8 in the first direction D1.

  Moreover, you may cut | disconnect a lead wire only by the cutting | disconnection accompanying welding, without performing cutting process S7.

  DESCRIPTION OF SYMBOLS 1 ... Coil components, 2, 3 ... Lead wire, 6, 7 ... Terminal metal fitting, 8 ... Main body, 9 ... Coil, 11, 12 ... Welded part, 13, 14 ... Main surface, 21, 23 ... Lead-out surface, 22, 24 ... inclined surface, 16 ... first side surface (end in the first direction), 31, 41 ... base piece, 32, 42 ... weld piece, 32a, 42a ... welded surface, 32b, 42b ... back surface, 34a, 44a ... adhesion Surface, 34b, 44b ... mounting surface, 50 ... pressure applying part (pressed part), D1 ... first direction, OE ... outer dimension defining region.

Claims (7)

A main body composed of a green compact containing a magnetic material;
A coil disposed inside the main body,
A pair of lead wires respectively drawn from the coil to the outside of the main body;
A terminal fitting connected to the lead wire on the outside of the main body, and
By welding the lead wire and the terminal fitting, a weld is formed,
Each of the pair of lead wires is drawn toward a first direction orthogonal to the axial direction of the coil,
The main body has a lead-out surface from which the lead wire is drawn outward,
The lead part is disposed on the coil side with respect to the end in the first direction of the main body, and intersects the lead wire perpendicularly. The terminal fitting is
A base piece extending along a main surface intersecting the axial direction in the main body portion and connected to the main body portion;
A weld piece extending along the lead wire and welded together with the lead wire,
The base piece has an adhesive surface to be bonded to the main surface, and a mounting surface to be mounted on an external component on the back surface side of the adhesive surface,
The coil component according to claim 1, wherein the weld piece has a weld surface facing the lead wire.   The coil component according to claim 2, wherein the weld surface has higher wettability with respect to a material constituting the lead wire than a back surface of the weld surface in the weld piece. The main body has an inclined surface between the end in the first direction and the drawing surface,
The coil component according to any one of claims 1 to 3, wherein the inclined surface is inclined so as to move away from the lead wire in the first direction.   A pair of said lead wires are extended toward the outer side of the said main-body part so that it may spread mutually, The coil components as described in any one of Claims 1-4 characterized by the above-mentioned. The main body has an outer dimension defining region that defines an outer dimension,
The coil component according to claim 1, wherein the welded portion is disposed in the outer dimension defining region.   The coil part according to any one of claims 1 to 6, wherein the welded portion is separated from the lead-out surface.

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