JPH0534098Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a chip-type LC composite component used, for example, as a noise filter.

[Prior art]

As an example of a chip-type LC composite component that can be surface-mounted on a board, etc., a structure as shown in FIG. 4 has been separately proposed.

That is, this chip-type LC composite component 2 includes a cylindrical capacitor 6 having an inner electrode 10 and an outer electrode 12 on the inner and outer circumferential surfaces of a cylindrical dielectric 8, respectively.
is passed through a round bar-shaped central conductor 4, and cylindrical magnetic cores (e.g. ferrite cores) 1 are placed on both sides of the central conductor 4.
4a and 14b respectively, and are covered with electrode caps 16a and 16b from both sides, respectively, and each electrode cap 16a and 16b is connected to the center conductor 4.
The contact portion S between the two is conductively joined by resistance welding or the like. Further, the inner electrode 10 of the capacitor 6 and the center conductor 4 are electrically connected to each other by soldering or the like.

The equivalent circuit of this chip-type LC composite component 2 is the fifth one.
As shown in the figure, it has a so-called T-shape.

[Purpose of invention]

In the chip-type LC composite component 2, it is necessary to cover both ends of the electrode caps 16a and 16b and conductively connect them to the center conductor 4 by resistance welding or the like, which complicates the process and increases costs. There is still room for improvement in terms of factors.

In addition, the center conductor 4 and the electrode caps 16a, 16
There is still room for improvement in the lack of reliability in the electrical connections between b and b.

Therefore, the purpose of this invention is to provide a chip-type LC composite component that further improves these points.

[Means to achieve the purpose]

The chip-type LC composite component of this invention has a cylindrical capacitor with electrodes on its inner and outer surfaces, a cylindrical magnetic core, which is passed through a central conductor, and the inner electrode of the capacitor and the center conductor are electrically connected. It is characterized in that metal terminals integral with the center conductor are provided at both ends of the center conductor.

[Effect]

Since the metal terminal can be easily formed by molding the center conductor, the process for providing it is simpler than in the previous example. Further, since there is no connection between the center conductor and the metal terminal as in the previous example, the reliability of the electrical and mechanical connection between the two is also improved.

〔Example〕

Figure 1 shows a chip type according to an embodiment of this invention.
FIG. 3 is a cross-sectional view showing the LC composite part. Components equivalent to those in the example of FIG. 4 are given the same reference numerals, and the differences therefrom will be mainly explained below.

The chip type LC composite component 20 of this embodiment includes a capacitor 6 and a magnetic core 14 as described above.
For example, a round bar-shaped central conductor 2 through which a and 14b are passed.
Metal terminals 26a and 26b, which are integral with the central conductor 24 and have a disk shape, for example, are provided at both ends of the conductor 4, respectively. The equivalent circuit of this chip-type LC composite component 20 is also shown in FIG.

An example of a method for manufacturing such a chip-type LC composite component 20 will be explained with reference to FIG. 2.

First, a center conductor 24 in the shape of a round bar, for example, which is longer than the finished product is prepared (FIG. A). The material for the center conductor 24 is preferably one that can be relatively easily molded in subsequent steps, and may be, for example, brass, aluminum, or the like.

Then, the capacitor 6 as described above is passed through the center conductor 24 (FIG. B). In this case, the capacitor 6 is fixed by soldering or molding of the center conductor 24, and the inner electrode 10 and the center conductor 24 are electrically connected.

Next, magnetic cores 14a and 14b as described above having the same or slightly smaller outer diameter than the capacitor 6 are inserted on both sides of the capacitor 6 (FIG. C). In this case, magnetic cores 14a, 1
4b may be fixed with adhesive or the like.

Next, both ends of the center conductor 24 are inserted into the cavity 3 corresponding to the intended metal terminals 26a, 26b.
Molds 28a and 28 having 0a and 30b, respectively
Press b to apply pressure inward to an appropriate position (D in the same figure). Therefore, metal terminals 26a and 26b as described above, which are integral with the center conductor 24, are formed at both ends of the center conductor 24, and as a result, a chip-type LC composite component 20 as shown in FIG. obtained (Fig. E).

After that, if necessary, the magnetic cores 14a, 1
The outer periphery of 4b is covered with an exterior material 32a made of resin or the like.
32b may be molded to provide external reinforcement (FIG. F). Or this exterior material 32a, 32b
may be performed after the step C above.

In this way, the chip-type LC composite component 20 is
Since the metal terminals 26a and 26b can be easily formed by molding the center conductor 24, etc., the metal terminals 26a and 26b
The process of providing the electrode caps 6a and 26b is simpler than the case of providing the electrode caps 16a and 16b of the previous example, which makes it easier to rationalize mass production and lower costs.

In addition, the center conductor 24 and metal terminals 26a, 26b
Since the two are integrated and there is no connection between them as in the previous example, the reliability of the electrical and mechanical connection between the two is also improved.

Further, since the metal terminals 26a and 26b are used for the signal line, the current carrying capacity is also increased.

Incidentally, instead of the center conductor 24 and metal terminals 26a and 26b as described above, a pipe-shaped center conductor 44 is used as in the chip-type LC composite component 40 shown in FIG. 3, and both ends of the center conductor 44 are caulked. Alternatively, metal terminals 46a and 46b may be formed integrally with the center conductor 44. In this example as well, the metal terminals 46a, 46b can be easily formed, and the center conductor 44 and the metal terminals 46a, 46b
Since there is no connecting portion between them, substantially the same effect as in the above embodiment can be obtained.

In addition, the shapes of the central conductor, magnetic core, and capacitor are not limited to round bar or cylindrical shapes.
It may also have another shape such as a rectangular cross section.

In addition, although the so-called T-shaped chip-type LC composite components have been described above, the structure according to this invention is applicable to other types of components, such as the above-mentioned capacitor having a magnetic core only on one side. Of course, the present invention can also be applied to so-called L-shaped LC composite parts and so-called π-type LC composite parts having capacitors on both sides of a magnetic core as described above.

[Effect of idea]

As described above, in the chip-type LC composite component of this invention, the metal terminal can be easily formed by molding the center conductor, etc., so the process of providing the metal terminal is simple and the cost is low.

Furthermore, since there is no connection between the center conductor and the metal terminal, the reliability of the electrical and mechanical connection between them is also improved.

Furthermore, since metal terminals are used for the signal lines, the current carrying capacity is also increased.

[Brief explanation of drawings]

Figure 1 shows a chip type according to an embodiment of this invention.
FIG. 3 is a cross-sectional view showing the LC composite part. FIG. 2 is a process diagram showing an example of a method for manufacturing a chip-type LC composite component as shown in FIG. FIG. 3 is a sectional view showing a chip-type LC composite component according to another embodiment of the invention. FIG. 4 is a sectional view showing a prior example of a chip-type LC composite component. Figure 5 is similar to Figure 1,
FIG. 4 is an equivalent circuit diagram of the chip-type LC composite component shown in FIGS. 3 and 4. FIG. 6... Capacitor, 10... Inner electrode, 12...
...Outer electrode, 14a, 14b...Magnetic core, 2
0,40...Chip type LC composite part according to the example,
24, 44...center conductor, 26a, 26b, 46
a, 46b...metal terminal.

Claims (1)

[Scope of utility model registration request] A cylindrical capacitor having electrodes on the inner and outer peripheral surfaces and a cylindrical magnetic core are passed through the center conductor, and the inner electrode of the capacitor and the center conductor are electrically connected.
A chip-type LC composite component, characterized in that metal terminals integral with the center conductor are provided at both ends of the center conductor.