JP3459888B2 - Electronic components - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component provided with a terminal member and a connection conductor electrically connected to the terminal member, and in particular, the terminal member and the connection conductor are joined to each other by resistance welding. The present invention relates to an electronic component having a structure.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing a part of a conventional electronic component 1 which is of interest to the present invention. The structure of the electronic component 1 is described as a conventional technique in, for example, Japanese Utility Model Publication No. 5-28751.

The structure of the electronic component 1 shown in FIG. 6 is adopted in an electronic component in which an element 2 such as a capacitor or an inductor is incorporated alone or in combination. Both ends of the electronic component 1 are covered with cap-shaped terminals 3 obtained by processing a metal plate serving as a terminal member, and a central conductor 4 is arranged on the central axis. The center conductor 4 serves as a connection conductor electrically connected to the cap-shaped terminal 3. The element 2 has a through hole 5 for receiving the center conductor 4, and is arranged on the center conductor 4 with the center conductor 4 being received in the through hole 5.

The above-mentioned electrical connection between the cap-shaped terminal 3 and the central conductor 4 is made between the inner surface 6 of each cap-shaped terminal 3 and each end surface 7 of the central conductor 4, but more concretely. , The inner surface 6 of the cap-shaped terminal 3 and the end surface 7 of the central conductor 4 are joined to each other by resistance welding in a region where they face each other, and electrical connection is achieved.

FIG. 7 shows another conventional electronic component 1a of interest to the present invention. This electronic component 1a
The structure is described as an example in, for example, the above-mentioned Japanese Utility Model Publication No. 5-28751.
It is also described in Japanese Patent No. 128. In FIG. 7 , elements corresponding to those shown in FIG. 6 are designated by the same reference numerals, and redundant description will be omitted.

The electronic component 1a shown in FIG. 7 is characterized in that a convex portion 8 is provided at the center of the inner surface 6 of the cap-shaped terminal 3. The same applies to the case of the center conductor 4 shown in FIG. 6 , but the center conductor 4 shown in FIG. 7 has a tubular shape, and each end face 7 has a ring shape having an opening at the center. ing. Therefore, the central conductor 4 receives the convex portion 8 on the side of the cap-shaped terminal 3 in the opening located at the center of the ring-shaped end surface 7, and thereby the cap-shaped terminal 3 is formed.
It can be reliably positioned in a state where it is properly centered with respect to.

[0007]

In the electronic components 1 and 1a shown in FIGS. 6 and 7 , respectively, the cap-shaped terminal 3 and the center conductor 4 are joined to each other by resistance welding as described above. However, in practice, it is relatively difficult to stably perform resistance welding between the cap-shaped terminal 3 and the center conductor 4, and particularly, the electronic component 1
And 1a are miniaturized, so that the cap-shaped terminal 3
As the joint area between the core conductor 4 and the central conductor 4 becomes narrower, it becomes more difficult to stably obtain a good welded state.

Speaking of the electronic component 1 shown in FIG. 6 ,
While the inner surface 6 of the cap-shaped terminal 3 and the end surface 7 of the center conductor 4 are opposed to each other, resistance welding is carried out in these opposed areas, but in order to achieve good resistance welding, The end face 7 must not only be in contact with each other, but must also be in contact with the entire opposed region without variation.

However, due to processing problems for obtaining the cap-shaped terminal 3 and the center conductor 4, the inner surface 6 and the end surface 7 are not always flat and smooth, and therefore the end surface 7 is not formed. Is difficult to contact the inner surface 6 with a predetermined contact area over the entire area.

When resistance welding is applied under such circumstances, the contact area between the inner surface 6 and the end surface 7 varies, the contact resistance varies, and the position of the contact portion varies. It may not be possible to stably obtain a proper resistance welding state. For example, the alloy may be produced by welding only in a limited region in the portion where the inner surface 6 and the end surface 7 face each other, and incomplete welding may be achieved. Such incomplete welding lowers the reliability of the electrical connection between the cap-shaped terminal 3 and the central conductor 4, and therefore, in the worst case, a slight stress is applied to the cap-shaped terminal 3 and the cap-shaped terminal 3. The electrical connection with the central conductor 4 may be broken, and the function of the electronic component 1 may be stopped.

In the electronic component 1a shown in FIG. 7 , the convex portion 8 provided on the cap-shaped terminal 3 has a conical shape, and the conical convex portion 8 has a ring shape of the center conductor 4. When fitted in the opening surrounded by the end face 7, the inner edge of the ring-shaped end face 7 of the central conductor 4 comes into contact with the protrusion 8 substantially evenly, and the resistance welding as described above is performed. It becomes easy to perform in good condition.

However, if the center conductor 4 is displaced as shown by the broken line in FIG. 7 for some reason, the end surface 7 of the center conductor 4 will be separated from the inner surface 6 of the cap-shaped terminal 3.
Respect, it does not contact only in a very limited area, when carrying out the resistance welding in this state, as compared with the case of the electronic component 1 shown in FIG. 6 described above, the contact area is reduced, more serious The situation is brought.

Therefore, an object of the present invention is to provide a structure of an electronic component which can solve the above problems.

[0014]

SUMMARY OF THE INVENTION The present invention provides an electronic component
Cap-shaped terminals that are covered on both ends and this cap-shaped terminal
It is one that is electrically connected to the terminal, in the electronic component
With a central conductor arranged on the core axis , with a cap-shaped end
In the region where the inner surface of the child and each end surface of the center conductor face each other.
There have been joined together by resistance welding, the center conductor
Having a through hole for receiving
Is placed on the center conductor with the center conductor received inside
In order to solve the above-mentioned technical problems, a cap-shaped device is provided which is further provided with an element.
The inner surface of the terminal should be located between the cap terminal and the center conductor.
It is characterized in that projections are provided to distribute the joints formed by resistance welding at a plurality of locations even if misalignment occurs .

[0015]

[0016]

[0017] In the present invention, to distribute the bonded portion at a plurality of positions, on the inner surface of the cap-shaped terminal, be provided with a plurality of projections are distributed at a plurality of positions, or the respective end faces of the centered conductor, the center in the case that forms a ring-shaped having an opening, collision-outs, be a shape having a portion extending to a plurality of linear arranged radially across the annular end faces of the centered conductor Good.

[0018]

1 to 4 are diagrams for explaining an electronic component 11 according to an embodiment of the present invention.

First, FIG. 1 shows a sectional view of the entire structure of the electronic component 11. This electronic component 11 constitutes a so-called T-type LC filter circuit, and has two inductor elements 12 and 13 and one capacitor element 1.
4 and.

More specifically, inductor elements 12 and 13 are made of, for example, cylindrical ferrite beads. Inductor elements 12 and 13 are provided with through holes 15 and 16 extending in the axial direction, respectively. Further, the capacitor element 14 is configured by a tubular capacitor such as a rectangular tube or a cylinder.
The capacitor element 14 has a through hole 1 extending in the axial direction thereof.
7 has a cylindrical dielectric 18 having an outer peripheral electrode 19 formed on the outer peripheral surface of the dielectric 18 and an inner peripheral electrode 20 formed on the inner peripheral surface.

The central conductor 21 has a through hole 15 in each of the inductor elements 12 and 13 and the capacitor element 14 so as to hold the above-described inductor elements 12 and 13 and the capacitor element 14 in an axially aligned state. It is arranged so as to penetrate through -17.

In FIG. 2, the central conductor 21 is shown alone in a perspective view.

The central conductor 21 is basically obtained by rolling a metal plate having a thickness of 0.05 to 0.08 mm, for example. As this metal plate, a metal plate having a high spring property and made of, for example, phosphor bronze or beryllium copper is used. The metal plate forming the central conductor 21 is substantially T-shaped in the expanded state. Such a T-shaped metal plate is first rolled from the horizontally extending portion of the "T", and then the vertically extending portion of the "T" is placed thereon as shown by the phantom line in FIG. Rounded into As a result, in the state shown by the solid line in FIG. 2, the elastic contact portion 22 having a relatively large diameter is formed in the central portion in the length direction of the central conductor 21.

Referring again to FIG. 1, when the central conductor 21 is arranged on the central axis of the electronic component 11, the elastic contact portion 22 is formed.
Becomes elastically in contact with the inner peripheral electrode 20 of the capacitor element 14. Therefore, the center conductor 21 of the capacitor element 14 can be used without using a bonding material such as solder.
An electrical connection and mechanical fixing to can be realized.

Further, since the center conductor 21 has a structure as shown in FIG. 2, it is possible to exert the elasticity toward the outside over the entire range in the length direction. Therefore, the inductor elements 12 and 13 can also be held at a predetermined position on the center conductor 21 by this elasticity.

Since the center conductor 21 is obtained by rolling a metal plate as described above, it has a cylindrical shape as a whole, and therefore the end faces 23 and 24 of the center conductor 21 are It has a ring shape with an opening in the center.

At both ends of the electronic component 11, more specifically, at one end of each of the inductor elements 12 and 13,
Cap-shaped terminals 25 and 26 which serve as terminal members are respectively covered. The cap-shaped terminals 25 and 26 are obtained by processing a metal plate, and are made of, for example, iron or iron-nickel alloy, and their surfaces are preferably plated with nickel, silver, or tin.

Such cap-shaped terminals 25 and 26
The inner surfaces 27 and 28 of each of the
1 to face the end faces 23 and 24 of the No. 1 and by applying resistance welding in these facing regions, the inner surfaces 27 and 2 of the cap-shaped terminals 25 and 26 are applied.
8 and the end faces 23 and 24 of the central conductor 21 are joined to each other to achieve electrical connection.

FIG. 3 is an enlarged view of a part of the electronic component 11 shown in FIG. 1, in which an end portion on the side of one cap-shaped terminal 25 is shown. FIG. 4 shows the inner surface 27 of the one cap-shaped terminal 25. Since the one cap-shaped terminal 25 and the configuration related thereto are substantially the same as the other cap-shaped terminal 26 and the configuration related thereto, the following description will be made with reference to FIGS. 3 and 4.
Will be performed in connection with the one cap-shaped terminal 25 shown in FIG.

On the inner surface of the cap-shaped terminal 25, a plurality of protrusions 29 are provided distributed in a plurality of places. In the present embodiment, these protrusions 29 are formed by squeezing out a part of the metal plate forming the cap-shaped terminal 25 at a plurality of locations. However, the protrusion 29 may be formed by another method, for example, the protrusion 29 may be formed by etching away a portion other than the portion where the protrusion 29 is to be formed.

The plurality of protrusions 29 as described above function to distribute the joint portions of the inner surface 27 of the cap-shaped terminal 25 and the end surface 23 of the central conductor 21 by resistance welding to a plurality of locations. In this way, by using the plurality of protrusions 29 to distribute the joints formed by resistance welding at a plurality of locations, the inner surface 27 and the end surface 2 that face each other during resistance welding can be obtained.
Regardless of the planar state of each of the three, the plurality of protrusions 29 can be reliably brought into contact with the end face 23, and even if the inner surface 27 and the end face 23 are misaligned, substantially the same contact area and Since the contact pressure can be secured, the resistance value in resistance welding can be stabilized, and reliable resistance welding can be stably achieved.

FIG. 5 is a view corresponding to FIG. 4, showing a cap-shaped terminal 25a provided in another embodiment of the present invention.

A protrusion 30 is provided on the inner surface 27 of the cap-shaped terminal 25a shown in FIG. 5, and the protrusion 30 has a plurality of radially extending portions, for example, a cross shape. It is characterized by being shaped. The shape of the protrusion 30 is combined with the ring shape of the end surface 23 of the central conductor 21 so that the joint portions by resistance welding are distributed at a plurality of locations.
The ring-shaped end surface 23 has a shape capable of contacting at a plurality of points.

More specifically, when the cap-shaped terminal 25a having the projection 30 having the above-described shape is used instead of the cap-shaped terminal 25 shown in FIGS. 1 and 3, the projection 30 has a center conductor. It crosses over the ring-shaped end face 23 of 21, so that the joints by resistance welding can be distributed at four points on the ring-shaped end face 23.

If the number of radially extending linearly arranged portions of the projection 30 is further increased, the number of joint portions in resistance welding can be further increased.

[0036]

[0037]

[0038]

The present invention has been described above with reference to the illustrated embodiments, but within the scope of the present invention,
Various modifications are possible.

For example, in the illustrated embodiment, the central conductor 21 or 21a has a cylindrical shape as a whole, but it may be replaced with a rectangular tube-shaped one, or instead of a cylindrical tube, the inside thereof may be replaced. It may be replaced with a real columnar one.

[0041]

[0042]

As described above, according to the present invention, the cap
On the inner surface of the cup-shaped terminal, since projections for distributing the joint portion by resistance welding to a plurality of places are provided, regardless of the planar state of the surfaces facing each other in this joint region,
When performing resistance welding, the cap-shaped terminal and the center conductor are
The body and the connecting conductor can be reliably brought into contact with each other at a plurality of positions, and even if the cap-shaped terminal and the central conductor are misaligned, the contact area and the contact pressure can be kept substantially constant. Therefore, the cap
Reliable resistance welding between Jo terminal and the center conductor can be stably achieved, it is possible to enhance the reliability of the electrical connection between the cap-shaped terminal and the center conductor.

The effects as described above are achieved by the electronic device according to the present invention.
Like parts, with cap-shaped terminals and center conductor,
And the end faces of the inner surface and the center conductor of the cap-shaped terminal are bonded to each other by resistance welding on opposite areas, further
To, Bei El elements disposed on the center conductor in a state of receiving the central conductor in the through hole and having a through hole for receiving the center conductor, when applied to electronic components, yo Ri Prominent It should also be noted that
This is because the area of the region where the inner surface of the cap-shaped terminal and each end surface of the center conductor face each other cannot be so large, and the contact area and the like are more likely to vary during resistance welding.

[Brief description of drawings]

FIG. 1 is a sectional view showing an electronic component 11 according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a single center conductor 21 shown in FIG.

FIG. 3 is an enlarged cross-sectional view showing an end of the electronic component 11 shown in FIG. 1 on the side of one cap-shaped terminal 25.

4 is a diagram showing an inner surface 27 of the cap-shaped terminal 25 shown in FIG.

FIG. 5 is a diagram showing an inner surface 27 of a cap-shaped terminal 25a included in another embodiment of the present invention .

FIG. 6 is a sectional view showing one end of a conventional electronic component 1 which is of interest to the present invention.

FIG. 7 is a sectional view showing one end of another conventional electronic component 1a which is of interest to the present invention.

[Explanation of symbols]

11 electronic component 12, 13 inductor 14 capacitor element 15, 16 and 17 through-holes 2 1 a central conductor (connection conductor) 23, 24 end surface 25,26,25a cap-shaped terminal (terminal member) 27 inner surface 29,3 0 Protrusion

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akito Asakura 2-10-10 Tenjin, Nagaokakyo City, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Masaki Kitagawa 2-26-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Akihiko Ueyama, Inventor Akihiko Ueyama 26-10 Tenjin, Nagaokakyo City, Kyoto Prefecture Murata Manufacturing Co., Ltd. (56) Bibliography Sho 59-123332 (JP, U) -165835 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01G 4/00-4/40

Claims (3)

(57) [Claims] 1. A cap that covers both ends of the electronic component.
A cap-shaped terminal and one electrically connected to the cap-shaped terminal and arranged on the central axis of the electronic component.
A central conductor, and the inner surface of the cap-shaped terminal and the
The central conductors are joined to each other by resistance welding in a region facing each end face and receive the central conductors.
Has a through hole for
Arranged on the central conductor with the core conductor received
An electronic component further comprising an element , wherein the cap-shaped terminal is provided on an inner surface of the cap-shaped terminal.
An electronic component, characterized in that a protrusion is provided for distributing a joint portion by resistance welding to a plurality of locations even if a positional deviation occurs with the central conductor . 2. The electronic component according to claim 1 , wherein a plurality of the protrusions are provided at a plurality of locations on the inner surface of the cap-shaped terminal in order to distribute the joint portions at a plurality of locations . Wherein each end face of the center conductor, have no ring shape having an opening at the center, to distribute the joint portion at a plurality of positions, said protrusions, ring-shaped end faces of the prior SL center conductor The electronic component according to claim 1 , wherein the electronic component has a shape having a plurality of linearly extending portions that are radially arranged so as to cross each other.