WO2017170497A1

WO2017170497A1 - Terminal structure for surface-mounted electronic component, surface-mounted electronic component comprising terminal structure, and surface-mounted reactor

Info

Publication number: WO2017170497A1
Application number: PCT/JP2017/012555
Authority: WO
Inventors: 亮治銭谷; 睦仁坂口; 昌浩森田; 雅俊秋田; 和幸山本
Original assignee: 日立金属株式会社
Priority date: 2016-03-29
Filing date: 2017-03-28
Publication date: 2017-10-05
Also published as: JP6489283B2; JPWO2017170497A1

Abstract

The present invention provides: a terminal structure for a surface-mounted electronic component with which, even though the structure is simple, an extension section extending from a terminal of a bottom surface is fixed to an opening section without loosening or lifting; a surface-mounted electronic component comprising the terminal structure; and a surface-mounted reactor. The present invention pertains to a terminal structure for a surface-mounted electronic component, the terminal structure being provided with, on a bottom surface thereof, a terminal 40 conducting to an element, wherein: the terminal structure is provided with an opening section 46 opening on a bottom surface S1 or a peripheral wall surface S2, a terminal 40 extending along the bottom surface S1, and an extension section 65 that extends from the terminal and is accommodated in the opening 46; the opening section 46 has an end wall and an inner peripheral wall adjoining same; a part of the inner peripheral wall forms a convex locking section; and the extension section 65 is such that a distal end section thereof bends along the end wall, and a proximal end side from the distal end section is locked in the locking section. The present invention also pertains to a surface-mounted electronic component comprising said terminal structure, and to a surface-mounted reactor.

Description

Terminal structure of surface mount electronic component, surface mount electronic component having the terminal structure, and surface mount reactor

The present invention relates to a terminal structure of a surface-mounted electronic component having a terminal connected to an element such as an inductor (reactor, coil), capacitor, semiconductor, or light-emitting element on the bottom surface, and a surface-mounted electronic component having the terminal structure and a surface It relates to a mounting type reactor.

In recent years, surface mount electronic components having terminals on the bottom have become mainstream for reasons such as downsizing and high integration of electronic devices. For example, reactors used in various power supply devices, electronic devices, etc., can be surface-mounted with a small area, and surface-mounted with a magnetic circuit as a closed magnetic circuit so that other nearby components are not magnetically affected A type reactor is known.

As described in Patent Document 1, the terminal structure of the surface mount reactor is such that the end of the coil made of a flat wire is drawn out from the bottom of the case with the terminal of the coil component and bent so as to cover the terminal. Known to be soldered to the terminals.

In this terminal structure, it is necessary to provide a metal terminal in the case separately from the coil, and it is necessary to solder-connect the end of the coil and the terminal, so that the coil component manufacturing process becomes complicated. There is a problem.

As a further simplification of such a terminal structure, Patent Document 2 discloses that an end portion of a coil made of a flat wire is protruded from the bottom surface of the outer casing of the coil component, and the end portion is directed toward the side surface of the outer casing. There has been proposed a terminal structure in which the tip of the coil is locked by a locking portion provided on the side surface by bending and then bending again. According to this terminal structure, it is possible to obtain a surface mount type coil component having a terminal that is electrically connected to the coil on the bottom surface, and it is not necessary to provide a metal terminal on the case separately from the coil, and the coil end and the terminal solder Connection is also unnecessary.

JP 2009-111314 A JP 2013-65746 A

However, in the terminal structure of Patent Document 2, since the opening portion into which the tip end portion of the coil can be inserted is provided as the shape of the locking portion provided on the side surface, the tip end portion of the coil is wobbled or loosened. easy. Further, as an example of the terminal structure, a structure in which the tip of the coil is abutted against the end wall of the opening is disclosed, but simply abutting the tip has a small effect of fixing the tip, and conversely, There arises a problem that accuracy in cutting the end portion is required.

As a result, in the terminal structure described in Patent Document 2, loosening or lifting occurs at the terminal on the bottom surface of the coil component.

Such a problem is not limited to the case of a coil component (including a reactor), but is a problem that is applied to all surface-mounted electronic components in which terminals are formed on the bottom surface with a metal such as a plate.

Accordingly, an object of the present invention is to provide a terminal structure of a surface mount electronic component in which an extension extending from a terminal on a bottom surface is fixed to an opening without loosening or lifting, and a surface having the terminal structure, although the structure is simple. The object is to provide a mountable electronic component and a surface mount reactor.

The above object is achieved by the present invention having the following effects.

That is, the terminal structure of the surface-mount type electronic component of the present invention is a terminal structure of a surface-mount type electronic component having a terminal that conducts to the element on the bottom surface, and an opening that opens to the bottom surface or the peripheral wall surface, and the bottom surface A terminal extending along the terminal, and an extension extending from the terminal and housed in the opening, the opening having a terminal wall and an inner peripheral wall connected thereto, and a part of the inner peripheral wall Is formed with a convex locking part, and the extension part is bent along the terminal wall, and the base end side of the extension part is locked to the locking part. To do.

According to the terminal structure of the surface mount electronic component of the present invention, not only the extension extending from the terminal is housed in the opening, but also a part of the inner peripheral wall of the opening forms a convex locking portion, The proximal end side of the extension portion is locked to the locking portion. Further, since the distal end portion of the extension portion is bent along the end wall of the opening portion, the extension portion is pressed against and fixed to the locking portion by a bending restoring force. As a result, it is possible to provide a terminal structure of a surface mount type electronic component in which the extension extending from the terminal on the bottom surface is fixed to the opening without loosening or lifting while having a simple structure.

In the present invention, the opening is provided in a resin member that constitutes at least the bottom surface of the surface mount electronic component, the locking portion is provided continuously to the end wall, and the distal end of the extension portion is provided. It is preferable to bite into the engaging portion in the vicinity of the end wall. According to this structure, at least the resin member constituting the bottom surface is provided with an opening, and the distal end portion of the extension portion is bitten into the engaging portion in the vicinity of the terminal wall, so that the extension portion extending from the terminal is more robust. Can be fixed to the opening.

Further, it is preferable that the resin member constitutes a bottom surface and a peripheral wall surface of the surface mount electronic component, and the opening is provided on the peripheral wall surface. By providing the opening on the peripheral wall surface, there is a structure in which an extension that rises from the terminal on the bottom surface along the side wall exists, and by soldering to the extension, the overall bonding strength can be increased.

Furthermore, the inner peripheral wall of the opening is provided with one wall surface that is disposed close to the base end side of the extension portion, the other wall surface that faces the wall surface, and another locking portion that is opposed to the other wall surface. It is preferable that each of the locking portions has a pair of inclined wall surfaces that are widened from the one wall surface side toward the other wall surface side. According to this structure, when the extension portion is bent and accommodated in the opening portion, the pair of inclined wall surfaces as described above exist, so that the extension portion can be guided along this and the extension portion can be easily used as the locking portion. Can be locked. Further, when the distal end portion of the extension portion is bitten into the engaging portion in the vicinity of the end wall, this can be easily performed.

Further, it is preferable that the terminal extends and bends from the bottom surface, extends to the opening or the peripheral wall surface along the bottom surface, and bends again. With such a structure, a terminal can be provided on the bottom surface of the surface-mount electronic component by utilizing the end portion of the element extending from the bottom surface.

Further, it is preferable that the terminal extending along the bottom surface is fixed inside a groove provided on the bottom surface. With this structure, the terminal can be positioned with the groove provided on the bottom surface of the surface mount electronic component, and the terminal is fixed inside the groove to prevent the terminal from being misaligned. it can.

In that case, it is preferable that a convex portion is provided on the bottom surface, and the terminal is fixed inside a groove provided in the convex portion. By adopting such a structure, the surface of the terminal can be arranged at a position protruding from the bottom surface, and it is easier to connect to the terminal when mounting the surface mount type electronic component on a wiring board or the like. Can do.

The terminal is preferably plate-shaped, and in particular, the element is an edgewise coil configured by a rectangular conductor, and the terminal and the extension are configured by a rectangular conductor at the end of the coil. In addition, the present invention is a preferred embodiment.

On the other hand, the surface-mount type electronic component of the present invention is characterized by having the terminal structure as described above. Moreover, the surface mount type reactor of the present invention is characterized by having the terminal structure as described above. Therefore, the surface-mount type electronic component and the surface-mount type reactor in which the extension portion extending from the terminal on the bottom surface is fixed to the opening portion without being loosened or lifted up can be provided by the above-described operational effects. .

It is the perspective view which showed the surface mount type reactor which concerns on one Embodiment of this invention in the partial cross section. It is a perspective view of the surface mount type reactor which concerns on one Embodiment of this invention. It is a perspective view which shows the principal part of the surface mount type reactor which concerns on one Embodiment of this invention. It is a figure for demonstrating the assembly of the surface mount type reactor which concerns on one Embodiment of this invention. It is a figure for demonstrating the assembly of the surface mount type reactor which concerns on one Embodiment of this invention. It is a perspective view containing the bottom face of the surface mount type reactor which concerns on one Embodiment of this invention. It is a perspective view of the surface mount type reactor which concerns on other embodiment of this invention. It is a cross section which shows the principal part of the surface mount type reactor which concerns on other embodiment of this invention. It is a perspective view of the surface mount-type electronic component which concerns on other embodiment of this invention. It is a perspective view which shows the principal part of the surface mount type reactor which concerns on other embodiment of this invention. It is a perspective view which shows the principal part of the surface mount type reactor which concerns on other embodiment of this invention. It is a front view which shows the principal part of the surface mount type reactor which concerns on other embodiment of this invention. It is a perspective view which shows the principal part of the surface mount type reactor which concerns on other embodiment of this invention. It is a perspective view which shows the principal part of the surface mount type reactor which concerns on other embodiment of this invention. It is a front view which shows the principal part of the surface mount type reactor which concerns on other embodiment of this invention.

(Terminal structure of surface mount electronic components)
FIG. 1 is a perspective view showing a partial cross-section of a surface mount reactor according to an embodiment of the present invention. In FIG. 1, as an example of the surface-mounted electronic component, a surface-mounted reactor is illustrated so that the bottom surface S1 is a lower surface. As shown in FIG. 1, the terminal structure of the surface mount electronic component of the present invention is provided with a terminal 40 that is electrically connected to an element such as a coil 60 on the bottom surface S 1. Such a terminal 40 only needs to be provided at least in one place on the bottom surface S1, and the number of terminals 40 is determined according to the type of element.

As the surface mount electronic component in the present invention, a so-called electronic component for power electronics is preferable from the viewpoint of a component size to which the terminal structure of the present invention is easily applied. Specifically, an electronic component such as a semiconductor such as a reactor, an inductor such as a coil, a capacitor, a resistor, a transistor, a diode, or an integrated body thereof, a battery, an antenna, a nonreciprocal circuit device, or a light emitting device can be given. . Hereinafter, the terminal structure of the surface mount electronic component of the present invention will be described with reference to an example of a surface mount reactor.

(Embodiment of surface mount type reactor)
FIG. 2 is a perspective view of a surface mount type reactor according to an embodiment of the present invention. FIG. 3 is a perspective view showing a main part of the surface-mount reactor according to the embodiment of the present invention.

As shown in FIG. 2, the terminal structure of the present invention has an opening 46 that is recessed in the peripheral wall surface S 2 and opens, a plate-like terminal 40 that extends along the bottom surface S 1, and the opening 46 that extends from the terminal 40. And a plate-like extension portion 65 housed in the housing. The opening 46 may be recessed in the bottom surface S1. The extension 65 may be all or a part of it may be accommodated in the opening 46.

As shown in FIG. 1, the plate-like terminal 40 extends from the bottom surface S1 and is bent, extends along the bottom surface S1 to the peripheral wall surface S2, and is bent again. In the illustrated example, a plate-like terminal 40 extends from a hole 45 provided in the resin base portion 30 constituting the bottom surface S1 and the peripheral wall surface S2.

Moreover, as shown in FIG. 3, the opening part 46 has the terminal wall 46b and the inner peripheral wall connected to this. The inner peripheral wall is a portion extending from the terminal wall 46b of the opening 46 to the peripheral wall surface S2 or the bottom surface S1, and in the illustrated example, the inner peripheral wall is disposed close to the proximal end side 65b of the extension 65. Wall surface 46c, the other wall surface 46d opposite to the wall surface 46c, and another pair of wall surfaces 46e each provided with an opposing locking portion. These wall surfaces 46c to 46e are shown as lower, upper, left and right wall surfaces in FIG. 3, respectively.

A part of the inner peripheral wall forms a convex locking portion 46a, and the tip 65a of the extension 65 is bent along the end wall 46b. The convex locking portions 46a may be provided only on one side of the other pair of wall surfaces 46e, but are preferably provided on both sides. It can also be provided at a plurality of locations on one side. When the convex locking portions 46a are provided on both sides of the pair of wall surfaces 46e, the interval between the narrowest portions of the locking portions 46a on both sides may be set narrower than the width of the extension portion 65 of the terminal 40. preferable.

The base end side 65b from the distal end portion 65a of the extension portion 65 is locked to the locking portion 46a. The shape of the locking portion 46a may be any shape as long as the extension portion 65 can be locked, and is not limited to a shape having a triangular cross section as viewed from the entrance front of the opening 46. For example, the cross section may be a semicircle or a crescent. In the present invention, it is preferable that the locking portion 46a has a pair of inclined wall surfaces 46f whose interval is widened from the one wall surface 46c side toward the other wall surface 46d side. Further, in the present invention, as shown in FIG. 3, the locking portion 46a is provided continuously to the end wall 46b, and the tip 65a of the extension 65 bites into the locking portion 46a in the vicinity of the end wall 46b. It is preferable.

As the member constituting at least the bottom surface S1 of the surface-mount type electronic component, a resin is preferable from the viewpoint of facilitating the biting structure, cost, and moldability. Of these, heat-resistant resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), and liquid crystal polymer are preferable.

The opening 46 is provided in a member constituting at least the bottom surface S1 of the surface-mount type electronic component, but is preferably provided in the resin base 30 constituting the bottom surface S1 and the peripheral wall surface S2. In particular, the opening 46 is preferably provided on the peripheral wall surface S 2 of the resin base 30.

Next, each member and assembly constituting the surface mount type reactor will be further described. 4 and 5 are views for explaining the assembly of the surface mount reactor according to the embodiment of the present invention. FIG. 6 is a perspective view including the bottom surface of the surface-mounted reactor according to the embodiment of the present invention.

For example, as shown in FIG. 4, the surface-mount type reactor 1 includes a coil 60, a first magnetic core portion 5 including a shaft portion 5 a and square-shaped

flange portions

5 b and 5 c located at both ends thereof, A second magnetic core portion 10 constituted by two L-shaped

members

10 a and 10 b and a resin base portion 30 provided with an opening 46 are provided. By using such a member, a plurality of members 10a that constitute the second magnetic core portion 10 and can be divided in the direction of the outside of the coil 60 with respect to the first magnetic core portion 5 in which the coil 60 is disposed on the shaft portion 5a. , 10b can be combined.

The first magnetic core portion 5 includes a shaft portion 5a and

square flange portions

5b and 5c located on both ends thereof. In the illustrated example, the columnar shaft portion 5a and the square and plate-shaped

flange portions

5b and 5c are each constituted by three members as separate members. At that time, the first magnetic core portion 5 is composed of a member that becomes the shaft portion 5a and a member that becomes the

flange portions

5b and 5c, and the end portion of the member that becomes the shaft portion 5a is formed on the member that becomes the

flange portions

5b and 5c. It is preferable to provide the recessed part 5d to accommodate. As another aspect, the shaft portion 5a and the flange portion 5c may be integrated and may be configured using a T-shaped member having an alphabetical cross section.

The first magnetic core portion is a pressure produced by, for example, mixing a metal magnetic material powder having an insulating film formed on the surface thereof and a silicone resin, compression-molding, and then performing an annealing heat treatment to remove residual stress. Use a powder magnetic core. Fe-based amorphous alloy ribbon, Fe-based nanocrystalline alloy ribbon, pure Fe, Fe-Si alloy, Fe-Ni alloy, Fe-Al alloy, Fe-Co alloy, Fe Fe-based soft magnetic material powders such as -Cr alloy and Fe-Si-M alloy (M is Cr or Al) can be used.

The second magnetic core 10 is composed of two

members

10a and 10b having an L-shaped cross section. The L-shaped

members

10a and 10b shown in the figure may be a dust core using a metal magnetic material as in the first magnetic core portion 5, but a soft ferrite material is used, and among them, a Mn type having a large saturation magnetic flux density Bs. The ferrite material is preferably used.

The coil 60 is constituted by winding a conductive wire (for example, an enameled wire in which a polyamide imide is coated on a copper wire). The conductors forming the coil 60 may have various cross-sectional shapes such as a circular shape and a rectangular shape, but if a conductive wire (rectangular wire) having a rectangular cross-section with a width to thickness ratio of 5 or more is used, the coil The space factor can be increased. In the illustrated example, an edgewise coil in which a rectangular wire is wound edgewise is used. The number of turns of the coil 60 is appropriately set based on the required inductance value, and the wire diameter is also appropriately selected depending on the current to be energized. And the terminal 40 and the extension part 65 are comprised by the flat conducting wire of the coil end part.

The material of the resin pedestal 30 is not particularly limited as long as the insulating performance is satisfied, for example, a resin such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), liquid crystal polymer, It can be obtained by a known molding method such as injection molding. As the insulation performance, the breakdown voltage is preferably 3 kV / mm or more, and more preferably 10 kV / mm or more.

The surface mount type reactor of the present embodiment can be manufactured through the following processes, for example.

First, as shown in FIG. 4, using one member 10 a and the other member 10 b, the inner surface of the second magnetic core portion 10 where the peripheral surfaces of the

flange portions

5 b and 5 c of the first magnetic core portion 5 face the coil 60. The first step of combining one member 10a and the other member 10b is performed so as to come into contact with each other. In this first step, an adhesive or the like is applied to the abutting surfaces of one member 10a and the other member 10b in advance, and is held on a holding stand, and a coil is placed between both

members

10a and 10b. It is preferable to insert the first magnetic core portion 5 in which 60 is disposed, and press and bond both the

members

10a and 10b from the outside.

Next, the second step of passing the extension portion 65 of the coil 60 through the hole 45 provided in the resin base portion 30 is performed using the resin base portion 30 having the hole portion 45 for passing the extension portion 65 of the coil 60. To do. Prior to this step, it is preferable to seal the coil 60 by introducing a resin into the space defined by the first magnetic core portion 5 and the second magnetic core portion 10. As this resin, a resin having high thermal conductivity such as silicone resin is preferably used.

In the second step, for example, the

members

10a and 10b of the second magnetic core portion 10 are sandwiched and held on the sandwiching plate of the sandwiching device, the extension portion 65 of the coil 60 is sandwiched between the chuck devices, and then the resin base portion 30 is placed. The extension part 65 is passed through the hole 45 from the tip by lowering. Thereafter, after removing the chuck device, the resin base 30 is further lowered and inserted between both

members

10a and 10b. As the resin base part 30, what has a pair of wall part 32 located so that the coil 60 may be pinched | interposed in the winding-axis direction of the coil 60 can be used.

Further, after the resin base portion 30 is arranged, the resin may be introduced into the inside thereof, and the resin base portion 30 may have an opening for introduction. When a thermosetting resin is used, it is preferable to cure the thermosetting resin by heating after introducing the thermosetting resin into the resin base 30.

Next, the extension portions 65 on both sides of the coil 60 extended from the resin base portion 30 are reversed from the extended portion toward the inner side (or outward) of the resin base portion 30 in the winding axis direction of the coil 60. The third step of forming the terminal 40 by bending in the direction is performed. Prior to this step, the extension portions 65 on both sides of the coil 60 are preferably cut to an appropriate length.

The third step can be carried out by sliding the horizontal rod horizontally with the surface mount reactor 1 fixed. Accordingly, the extension portions 65 on both sides of the coil 60 are bent along the bottom surface of the resin base portion 30. Further, after the third step, the length of the extension portion 65 is set so that the distal end portion 65 a of the extension portion 65 of the coil 60 is in a position extended from the bottom surface of the resin base portion 30.

First, with the surface-mounted reactor 1 fixed, a step of sliding a vertical rod (not shown) in a downward direction and bending the extension portion 65 of the coil 60 along the side surface of the resin base portion 30 is performed. To do. Thereby, the front-end | tip part 65a of the extension part 65 of the both sides of the coil 60 can be located in the outer side of the opening part 46 provided in the side surface of the resin stand part 30. FIG.

Next, as shown in FIG. 5, with the surface-mounted reactor 1 fixed, the push rod 55 is slid in the direction of the arrow, and the vicinity of the tip 65 a of the extension 65 of the coil 60 is moved to the side of the resin base 30. The step of bending the inside of the opening 46 provided in is performed. Thereby, as shown in FIG. 6, the tip portions 65 a of the extension portions 65 on both sides of the coil 60 can be positioned inside the opening 46 provided on the side surface of the resin base portion 30.

At this time, as shown in FIG. 3, when the extension portion 65 is bent, the extension portion 65 is deformed to get over the convex locking portion 46a, and the base end side 65b from the distal end portion 65a of the extension portion 65 is Lock to the locking portion 46a. Moreover, since the latching | locking part 46a is provided continuously to the termination | terminus wall 46b, it becomes a structure where the front-end | tip part 65a of the extension part 65 bites into the latching | locking part 46a of the vicinity of the termination | terminus wall 46b.

(Other embodiment of surface mount type reactor)
FIG. 7 is a perspective view of a surface mount reactor according to another embodiment of the present invention. In this example, an opening 46 is provided on the bottom surface S 1 of the resin base 30, and the entire extension portion 65 is accommodated inside the opening 46. The plate-shaped terminal 40 extends from the hole 45 of the bottom surface S1 and bends, and extends along the bottom surface S1 to the opening 46 and bends again. Except for these points, this surface-mounted reactor is the same as that of the above-mentioned embodiment.

The details of the terminal structure are also the same as in FIG. 3, and the opening 46 has a terminal wall 46b and an inner peripheral wall connected to the terminal wall 46b. In the illustrated example, the inner peripheral wall is provided with one wall surface 46c arranged close to the base end side 65b of the extension portion 65, the other wall surface 46d facing the wall surface 46c, and the engaging portion facing each other. And another pair of wall surfaces 46e.

A part of the inner peripheral wall forms a convex locking portion 46a, and the tip 65a of the extension 65 is bent along the end wall 46b. The base end side 65b from the distal end portion 65a of the extension portion 65 is locked to the locking portion 46a.

In the above-described embodiment, the example of the surface-mounted reactor 1 in which the winding axis direction of the coil 60 is arranged to be parallel to the bottom surface S1 is shown, but the winding axis direction of the coil 60 is perpendicular to the bottom surface S1. The surface mount type reactor 1 arrange | positioned in this way may be sufficient. In that case, the end portion of the coil 60 is bent toward the bottom surface S1 and extends from the bottom surface S1. Even in such a structure, a magnetic circuit is formed by using the first magnetic core portion 5 including the shaft portion 5a and the

flange portions

5b and 5c located on both ends thereof, and the second magnetic core portion 10 surrounding them. Can be a closed magnetic circuit. At this time, by providing a notch portion in the lower flange portion, the end portion of the coil 60 can be pulled out from the first magnetic core portion to the bottom surface S1 side.

In the above-described embodiment, the example in which the two terminals 40 are formed by using one coil 60 and bending the end portion thereof is shown. However, the coil 60 made of a plurality of winding wires that enables mutual induction. Four or more terminals 40 may be formed using In the case of forming four or more terminals 40, it is preferable to provide the opening 46 in the peripheral wall surface S2.

On the other hand, FIG. 8 is a cross-sectional view showing a main part of a surface mount type reactor according to another embodiment of the present invention, and FIGS. 8 (a) to 8 (c) are front end portions of the locking portion 46a or the extension portion 65. Examples of different shapes and the like of 65a are shown.

In the example shown in FIG. 8A, a convex locking portion 46a that forms part of the wall surface 46e that is the inner peripheral wall of the opening 46 is provided from the center in the depth direction of the wall surface 46e to the end wall 46b. Yes. Thus, the convex locking part 46a in the present invention may be provided only in a part in the depth direction of the inner peripheral wall.

In the example shown in FIG. 8B, the tip 65a of the extension 65 is bent along the end wall 46b, and the tip of the tip 65a is further bent away from the end wall 46b. Thus, only a part of the tip 65a of the extension 65 in the present invention may be bent along the end wall 46b.

In the example shown in FIG. 8C, a convex locking portion 46a that forms part of the wall surface 46e that is the inner peripheral wall of the opening 46 is provided from the entrance end of the wall surface 46e to the vicinity of the end wall 46b. There is a gap between the convex locking portion 46a and the end wall 46b. For this reason, the front-end | tip part 65a of the extension part 65 does not bite into the latching | locking part 46a, and is press-contacting to the latching | locking part 46a with the bending restoring force of the base end side 65b of the extension part 65. FIG. At this time, it is also possible to adjust the bending state so that the bending restoring force of the distal end portion 65a of the extension portion 65 also works.

In the above-described embodiment, an example of a structure in which the terminal 40 extends along the planar portion of the bottom surface S1 has been described. However, in the present invention, a bonding groove is provided on the bottom surface S1 so as to increase the strength of the terminal 40. May be. Moreover, it is also preferable to make the part which overlaps with the terminal 40 of the bottom face S1 project so that heat may be easily transmitted to the terminal 40 when mounted on a substrate or the like. Moreover, it is preferable that the terminal 40 is fixed inside the groove 34 provided in the bottom surface S1. As a method of fixing the terminal 40 in the groove 34, there are adhesion, fitting, heat fusion, and the like, but a method of bonding using an adhesive such as an epoxy adhesive is preferable.

In this embodiment, for example, a resin base 30 as shown in FIGS. 10A to 10C is used. 10A is a perspective view of the resin pedestal 30 as viewed obliquely from above, FIG. 10B is a perspective view of the resin pedestal 30 as viewed from obliquely below, and FIG. 10C is a front view of the resin pedestal 30.

In this example, the groove 34 extends from the hole 45 provided in the bottom surface S1 of the resin base 30 to the vicinity of the boundary with the peripheral wall surface S2 in the direction of the opening 46, and the terminal 40 is provided inside the groove 34. Is fixed. When the terminal 40 is disposed from one end to the other end of the bottom surface S1, the groove 34 can be disposed from one end to the other end of the bottom surface S1.

In the illustrated example, an injection port 36 penetrating from the bottom surface S1 of the resin base portion 30 to the other surface is provided so as to overlap the groove 34. The injection port 36 can be provided for injecting and filling an adhesive (for example, heat-dissipating silicone) into the surface mount electronic component. In the case of the surface mount type reactor as shown in FIG. 1, the adhesive firmly fixes the parts such as the resin base portion 30 and the coil 60, the first magnetic core portion 5, the second magnetic core portion 10 and the like. A heat path is formed with an adhesive between the second magnetic core portion 60 and the second magnetic core portion 10, and heat can be released to a heat radiating plate (not shown) provided so as to contact the second magnetic core portion 10.

Further, when the groove 34 is provided on the bottom surface S 1 of the resin base portion 30, the convex portion 38 is provided on the bottom surface S 1, and the terminal 40 is fixed inside the groove 34 provided on the convex portion 38. Is preferred.

In that case, for example, a resin base 30 as shown in FIGS. 11A to 11C is used. FIG. 11A is a perspective view of the resin pedestal 30 as viewed obliquely from above, FIG. 11B is a perspective view of the resin pedestal 30 as viewed from obliquely below, and FIG. 11C is a front view of the resin pedestal 30.

In this example, the ridge 38 extends in the direction of the opening 46 from the hole 45 provided in the bottom surface S 1 of the resin base 30 to the vicinity of the boundary with the peripheral wall S 2, and is parallel to the ridge 38. The terminal 40 is fixed inside the groove 34 provided in the. In addition, as shown in the illustrated example, both ends in the longitudinal direction of the ridges 38 can be inclined surfaces, which makes it easier to bend the terminals 40 at both ends of the ridges 38. (E.g., increasing the radius of curvature).

(Another embodiment of surface mount electronic component)
FIG. 9 is a perspective view of a surface mount electronic component according to another embodiment of the present invention. The illustrated example is a case where the surface-mount electronic component is an inductor including a coil 60 and a magnetic core 9 using a conducting wire having a circular cross section.

In this example, as shown in FIG. 9, the terminal 40 is integrally formed with the resin base 30, and the terminal 40 extends to the bottom surface S 1 side and the top surface S 3 side of the resin base portion 30. The terminal 40 extending to the upper surface S3 side is electrically connected to the end of the coil 60 with solder or the like, whereby the terminal 40 is electrically connected to the element (coil 60) of the electronic component. In this aspect, an integrally molded body of the resin base portion 30 and the terminal 40 is configured as a relay member (interposer).

The terminal 40 extending to the bottom surface S 1 side of the resin base 30 is bent along the bottom surface S 1, further bent, and stored in the opening 46. The shapes and the like of the locking part 46a and the extension part 65 are as described above.

Surface mount electronic components to which the terminal structure of the present invention can be applied are not limited to inductors such as reactors and coils, but are also semiconductors such as capacitors, resistors, transistors, diodes, or their integrated bodies, batteries, antennas, and nonreciprocal. An electronic component such as a circuit element or a light emitting element can be given.

For any electronic component, as shown in FIG. 9, the terminal structure of the present invention can be implemented by electrically connecting the element and the plate-like terminal. Moreover, since a thin plate-like electrode is used for a capacitor or a battery, the end portion thereof is elongated and used as the terminal 40 and the extension portion 65 in the present invention, thereby constituting the terminal structure of the present invention. can do.

In power semiconductors and the like, there is a form in which a plate-like lead is extended from the package, and these also use a resin base part having a hole part through which the lead is inserted and an opening part having a locking part. Thus, the terminal structure of the present invention can be configured by bending the lead extending from the hole to form the terminal and the extension.

DESCRIPTION OF SYMBOLS 1 Surface mount type reactor 5 1st magnetic core part

5a Shaft part

5b, 5c collar part 10 2nd magnetic core part 30 Resin base part 34 Groove 38 Projection part 40 Terminal 45 Hole part 46 Opening part

46a Locking part

46b Termination wall

46c Wall surface

46d Wall surface

46e Wall surface 60 Coil 65 Extension portion 65a Tip portion 65b Base end side S1 bottom surface S2 peripheral wall surface S3 top surface

Claims

It is a terminal structure of a surface mount type electronic component provided with a terminal conducting to an element on the bottom surface,
An opening that opens to the bottom surface or the peripheral wall surface, a terminal that extends along the bottom surface, and an extension that extends from the terminal and is housed in the opening,
The opening has a terminal wall and an inner peripheral wall connected to the end wall, and a part of the inner peripheral wall forms a convex locking portion,
The terminal portion of the surface mount type electronic component in which the extension portion is bent along the terminal wall and the proximal end side of the extension portion is locked to the locking portion.
The opening is provided in a resin member that constitutes at least the bottom surface of the surface-mount electronic component,
The terminal structure of the surface-mount type electronic component according to claim 1, wherein the locking portion is provided continuously to the end wall, and a distal end portion of the extension portion bites into the locking portion in the vicinity of the end wall. .
3. The terminal structure of a surface mount electronic component according to claim 2, wherein the resin member constitutes a bottom surface and a peripheral wall surface of the surface mount electronic component, and the opening is provided on the peripheral wall surface.
The inner peripheral wall of the opening is a pair of another wall surface provided with one wall surface disposed close to the proximal end side of the extension portion, the other wall surface facing the wall surface, and a locking portion facing each other. 4. The method according to any one of claims 1 to 3, wherein each of the locking portions has a pair of inclined wall surfaces that increase in distance from the one wall surface side toward the other wall surface side. Terminal structure of the surface mount electronic component as described.
The surface according to any one of claims 1 to 4, wherein the terminal extends from the bottom surface and is bent, extends along the bottom surface to the opening or the peripheral wall surface, and is bent again. Terminal structure of mounted electronic components.
6. The terminal structure of a surface mount electronic component according to claim 1, wherein the terminal extending along the bottom surface is fixed inside a groove provided on the bottom surface.
7. A terminal structure of a surface mount electronic component according to claim 6, wherein a protrusion is provided on the bottom surface, and the terminal is fixed inside a groove provided in the protrusion.
The surface according to any one of claims 1 to 7, wherein the element is an edgewise coil composed of a flat wire, and the terminal and the extension portion are formed by a flat wire at the end of the coil. Terminal structure of mounted electronic components.
A surface-mount electronic component having the terminal structure according to any one of claims 1 to 8.
A surface-mounting type reactor having the terminal structure according to claim 8.