JPH0135449Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to an improvement in the connection structure of connection leads in electronic components such as ferrite bead coils and chiyoke coils.

(Technical background) Recently, ferrite bead coils in which a lead wire is inserted through a cylindrical ferrite core, and chiyoke coils in which a wire is wound around a drum-shaped ferrite core and lead wires are fixed to both end surfaces of the core have been widely used.
In this case, since the ferrite core itself is difficult to solder, some effort is required to connect and fix the lead wires.

(Prior Art and Problems) Fig. 1 shows a ferrite bead coil with a conventional lead wire connection structure. In this figure, a lead wire 2 is inserted through a cylindrical ferrite core 1, and the lead wire 2 is bent along both end surfaces of the cylindrical ferrite core 1.

The ferrite bead coil shown in Fig. 1 can be used as a chip-shaped bead coil, but
It was difficult to bend the lead wire 2 along both ends of the core, and the workability tended to be poor. Furthermore, since the bent ends of the lead wires 2 also serve as electrodes for the chip-shaped bead coil, there is a drawback that it is difficult to solder them to a substrate or the like.

(Purpose of the invention) In view of the above points, the present invention applies special processing to the leads by pasting a metal foil on the connection end surface of the electronic component body, and passing the connection lead through the metal foil and soldering it. It is an object of the present invention to provide an electronic component that does not require additional bonding and can easily and reliably connect and fix leads.

(Embodiments of the invention) Examples of the electronic component according to the invention will be described below with reference to the drawings.

FIG. 2 shows a ferrite bead coil as a first embodiment of the present invention, FIG. 3 shows its manufacturing process, and FIG. 4 shows its equivalent circuit. In this case, first metal foils 11 are placed on both end surfaces of the cylindrical ferrite core 10.
is pasted with adhesive or the like, and then the lead wire 12 is passed through the metal foil 11 and into the center hole 13 of the cylindrical ferrite core 10. At this time, the lead wire 12 is cut to a length that allows connection of the metal foil 11 on both end faces of the core. Then, both ends of the lead wire 12 and each metal foil 11
Connect and fix by soldering.

In the ferrite bead core of the first embodiment, no special processing is required for the lead wire 12,
By piercing the lead wire 12 through the metal foil 11 and soldering it, the lead wire 12 can be connected and fixed very easily and reliably. Such a ferrite bead coil can be used as a chip-shaped bead coil, and the solder portions 14 on the metal foil 11 on both end faces of the core function effectively as electrodes, allowing good soldering to a substrate or the like.

Further, the lead wire 12 has a metal foil 11 with a hole (or initially no hole) smaller than the diameter of the lead wire 12.
The metal foil 11
can be mechanically pressed against the lead wire 12, and it is possible to prevent loose solder and loose contacts that may occur when the solder is remelted when soldering the product to the board. Further, even during the manufacturing process, the lead wire 12 is temporarily fixed by the pressure contact effect of the metal foil 11, which improves workability during the process.

Note that instead of bonding the metal foil 11 to the ferrite core 10 , a step of receiving the metal foil 11 with a mold or the like, piercing the lead wire 12 , soldering it, and finally bonding the metal foil 11 to the ferrite core 10 is performed. It can also be manufactured.

FIG. 5 shows a ferrite bead coil as a second embodiment of the present invention, and FIG. 6 shows its equivalent circuit. In this case, first, the glasses-shaped ferrite core 2
A metal foil 21 is pasted with adhesive or the like to one end surface that will be the connection end surface of the metal foil 21, and lead wires 23 are arranged and fixed on the taping mount 22 at intervals between the two through holes 24 of the spectacle-shaped ferrite core 20. . Then, connect the lead wire 23 to the spectacle-shaped ferrite core 2.
0 through the through hole 24 and further through the metal foil 21. Then, the tips of the paired lead wires 23 and the metal foil 21 are connected and fixed by soldering.

In the ferrite bead core of the second embodiment, there is no need for special processing such as bending the lead wires 23 into a U-shape, and the paired lead wires 23
By penetrating the metal foil 21 and soldering it, the lead wire 23 can be fixed very easily and reliably. At the same time, the metal foil 21 and the solder portion 25 ensure electrical connection between the paired lead wires. In this case, mass productivity can be improved by arranging the lead wires 23 on the taping mount 22 in advance and sequentially attaching the spectacle-shaped ferrite cores 20 with the metal foil 21 attached to the connection end surfaces. .

FIG. 7 shows a chiyoke coil as a third embodiment of the present invention. In this figure, there are recesses 3 on both end faces.
A winding wire 32 is applied to a drum-shaped ferrite core 30 formed as shown in FIG. Then, the lead wire 35 having the flange portion 34 is passed through the metal foil 33 and provided at both ends of the drum-shaped ferrite core 30, and the lead wire 35 and each metal foil 33 are connected and fixed by soldering. Note that the lead-out end of the winding 32 is connected to the solder portion 36.
or to the lead wire 35.

In the chiyoke coil of the third embodiment,
By passing the lead wire 35 through the metal foil 33 and soldering it, the lead wire 35 can be connected and fixed very easily and reliably, and the workability of the process of attaching the lead wire 35 is good.

Although FIG. 5 shows the lead wires arranged on the taping mount, a lead frame having connection leads at predetermined intervals may be used instead.

(Effects of the invention) As explained above, according to the invention, a metal foil is attached to the connection end surface of the electronic component main body, and the connection lead is pierced through the metal foil and soldered. It is possible to obtain an electronic component that does not require any processing and in which leads can be easily and reliably connected and fixed, and the practical effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a ferrite bead coil with a conventional lead wire connection structure, FIG. 2 is a front sectional view showing a ferrite bead coil as a first embodiment of an electronic component according to the present invention, and FIG. 4 is an equivalent circuit diagram of the first embodiment, FIG. 5 is a front sectional view showing the ferrite bead coil as the second embodiment of the present invention, and FIG. 6 is a front sectional view showing the manufacturing process in that case.
The figure is an equivalent circuit diagram, and FIG. 7 is a front sectional view showing a chiyoke coil as a third embodiment of the present invention. 1, 10... cylindrical ferrite core, 2, 12,
23, 35... Lead wire, 11, 21, 33...
Metal foil, 20...Glasses-shaped ferrite core, 30
...Drum-shaped ferrite core.

Claims (1)

[Scope of utility model registration request] A ferrite core having an end face with a hole or recess formed therein, a metal foil fixed to the end face with the hole or recess formed therein, and a connection lead pierced through the metal foil and fixed thereto. Featured electronic components.