JP3055431B2 - Electronic component manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing electronic parts such as metallized film capacitors used for electronic equipment and electric equipment.

[0002]

2. Description of the Related Art Conventionally, when a lead wire is welded to a capacitor element in a metallized film capacitor, FIG.
This was performed as shown in FIG.

The conventional welding method as described above will be described below with reference to the drawings. FIG. 4 schematically shows a case where a lead wire is welded to a capacitor element, and FIG.
FIG. In the figure, 1 is a negative rectangular electrode of tungsten material, 2 is a positive rectangular electrode of tungsten material, 3 is a capacitor element, 4 is a lead wire, and 5 is a capacitor element 3.
Reference numeral 6 denotes a welding electrode holder, and reference numeral 7 denotes a weldable position at the tip of the rectangular electrodes 1 and 2. 8 is a current flowing through the electrode.

First, the lead wire 4 is restricted to the center position of the electrode portion 5 of the fixed capacitor element 3, and the rectangular electrodes 1 and 2, which are fixed to the holder 6 and pressurized thereon, are pressed from above. In this method, an electric current is applied to generate Joule heat at the tip of the electrode, and the lead wire 4 and the electrode portion 5 are welded.

[0005]

However, in such a welding method, the material of each of the rectangular electrodes 1 and 2 as a pair of welding electrodes is the same tungsten material, and furthermore, the electrode tip of the rectangular electrode 1 is Since the generated heat is transmitted through the lead wire 4 and escapes, the heat generated at the electrode tip of the square electrode 1 is small and non-uniform. Therefore, when the lead wire 4 and the electrode portion 5 of the capacitor element 3 are welded, the degree of welding at the electrode tip of the square electrode 1 becomes small, the welding strength becomes unstable, and the cause of insufficient strength failure and no welding failure. It has become. Further, at this time, if the current is further increased in order to increase the welding strength of the electrodes, the tips of the rectangular electrodes 1 and 2 are quickly worn, which also causes a short life.

The present invention has been made in order to solve the above-mentioned problems.

[0007]

In order to achieve this object, the present invention provides a method in which one of a pair of welding electrodes is used.
Constructed from tungsten, the other welding electrode is copper tongue
And a pair of welding electrodes with a disc shape
And perform welding on the peripheral surface of the disk-shaped welding electrode.
The welding position is changed every arbitrary number of weldings .

[0008]

[Function] One of the welding electrodes is made of tungsten and the other is made of tungsten.
One of the welding electrodes is made of copper tungsten,
The pair of welding electrodes is made into a disk shape, and the disk-shaped welding electrode
The welding is performed on the peripheral surface of
By changing the welding position every number , the welding strength can be improved, the reliability can be improved , and the welding electrode can be improved.
The life of the device can be improved.

[0009]

1 to 3 show an embodiment of the present invention.
This will be described with reference to the drawings.

FIG. 1 shows an outline of resistance welding of a lead wire to a capacitor element of a metallized film capacitor.
FIG. 2 is a plan view of FIG. In the figure, reference numeral 11 denotes a disc-shaped circular round electrode made of tungsten, 12 denotes a disc-shaped circular round electrode made of copper tungsten, 13 denotes a capacitor element of a metallized film capacitor, 14 denotes a lead wire, Fifteen
Is an electrode part of the capacitor element 13, 16 is a holder for the welding electrode, and 17 is a current flowing through the electrode.

First, the lead wire 14 is regulated at the center position of the electrode portion 15 of the fixed capacitor element 13, and the lead wire 14 is fixed to the holder 16 from above, and the peripheral surfaces of the pressure-applied round electrodes 11, 12 are applied. A part of the lead wire is pressed to generate a large current and generate Joule heat at the tip of the electrode.
And the electrode portion 15 are welded.

FIG. 3 is a plan view of FIG. 2 viewed from the lateral direction. In the figure, round electrodes 11 and 12 are attached to holder 1.
6, a gear 19 having a plurality of grooves 19a formed on its outer peripheral surface.
Has been fixed. A ball 21 which is constantly pressed toward the gear 19 by a spring 20 is engaged with the groove 19 a of the gear 19.
By rotating the gear 19 against the engaging force of the round electrode 11, the round electrodes 11 and 12 rotate, and the welding position of the lead wire 14 of the round electrodes 11 and 12 is changed every time the welding is performed an arbitrary number of times. Can be changed. That is, the shape of the welding electrode is changed to a disk shape, and, for example, the range usable for welding can be used at 36 places on the outer peripheral surface of the round electrode, so that one welding position is worn out and becomes unusable. When it is possible, by rotating every 10 ° and welding at a new position, the life can be extended 36 times.

In Table 1, the material of the negative round electrode 11 is fixed, and the positive round electrode 12 is changed to one having high conductivity (low specific resistance) to fix the welding power value. The welding strength, the weld defect rate, and the electrode life at the time of comparison are shown.

[0014]

[Table 1]

As can be seen from Table 1, the welding performed according to Examples 1 to 4 of the present invention has an improved welding strength and a reduced defective weld ratio compared to the prior art. Further, by setting the material of the welding electrode to tungsten for one side and copper tungsten for the other side, the life of the welding electrode can be improved.

In the above description, a metallized film capacitor has been described as an example. However, the present invention can be applied to other electronic components as long as they have a structure in which a lead wire is welded to a component element. it can.

[0017]

In the present invention as described above, according to the present invention, in one
The welding electrode is made of tungsten and the other welding electrode is
Constructed from copper tungsten and a pair of welding electrodes
Disc-shaped, on the peripheral surface of the disc-shaped welding electrode
It is configured to perform welding, and the welding position is
By changing the welding strength, the welding strength can be improved, the reliability can be improved, and the life of the welding electrode can be improved.
It can also be done.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a welding method according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a perspective view schematically showing a conventional welding method.

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 11, 12 Round electrode 13 Capacitor element 14 Lead wire 15 Electrode part 16 Holder

Continuation of front page (72) Inventor Toru Uchida 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-52-125755 (JP, A) JP-B-46-4505 (JP) , B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01G 4/00-4/42 H01G 13/00-13/06

Claims (2)

(57) [Claims] When a lead wire is resistance-welded to a component element, one of a pair of welding electrodes is connected to a tongue.
And the other welding electrode is made of copper tungsten , and a pair of welding electrodes is formed in a disk shape.
It is configured so that welding is performed on the peripheral surface of the disk-shaped welding electrode.
A method for manufacturing an electronic component, wherein the welding position is changed every time the welding is performed . 2. The positive electrode of the pair of welding electrodes is made of copper tongue.
The method for producing an electronic component according to claim 1, wherein the electronic component is made of stainless steel, and the negative side is made of tungsten .