JPS6160568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a solid electrolytic capacitor, and more specifically, it provides a method for manufacturing a solid electrolytic capacitor with high productivity and at low cost.

In general, solid electrolytic capacitors consist of an anode body by forming a dielectric film by anodizing on the surface of an electrode made of a valve metal such as tantalum, niobium, or aluminum, which has an anode lead wire, and then A capacitor element is constructed by forming a semiconductor metal oxide layer such as manganese dioxide, and then sequentially laminating a cathode layer such as carbon and a cathode conductive layer made of silver paint, solder, etc. After connecting the anode external terminal and cathode external terminal to the anode lead-out wire and cathode conductive layer, the finished product is made by wrapping it with a dip or molding with an insulating resin, or storing it in a case and sealing it.

Conventionally, in such a solid electrolytic capacitor, when connecting an anode lead wire and a cathode external terminal, as shown in FIGS. After cutting the part, it is overlapped with the L-shaped anode external terminal 2 and welded, or as shown in Figs.
As shown in the figure, after the anode lead wire 1a was connected to the anode external terminal 2, an unnecessary portion of the anode lead wire 1a was cut off. In addition, in FIGS. 1 to 4,
3 is a cathode external terminal, and the cathode external terminal 3 and anode external terminal 2 are obtained by punching the metal frame 4. In addition to providing the anode external terminal 2 and the cathode external terminal 3 by punching the metal frame 4, it is also possible to use a normal lead wire and one end of the lead wire fixed to a long holding plate. good.

5a and 5b are upper and lower blades for cutting the anode lead wire 1a.

By the way, in such a conventional method, when the unnecessary part of the anode lead wire 1a is cut and connected before connection, the remaining anode lead wire 1a after cutting is very short, such as 0.5 to 2 mm. Since it is not possible to grasp the anode lead wire 1a, the capacitor element 1 is held with a jig and the anode lead wire 1a is placed on the anode external terminal 2 and welded. 1, mechanical stress is applied to the capacitor element 1, which has an adverse effect on the capacitor element 1, resulting in many defective products and poor workability. In addition, when cutting unnecessary parts after connecting the anode lead wire 1a, the anode lead wire 1a is grabbed and placed on the anode external terminal 2 and welded, but in this case, the mechanical stress is Since it is not added to the element 1, the above-mentioned problems do not occur, but the production equipment becomes extremely complicated and expensive, and there are disadvantages in that productivity is poor.

In addition, in such a conventional method, it is very difficult to cut the anode lead wires 1a of multiple capacitor elements 1 at once due to the equipment, so in reality, they are cut one by one. However, it was not a desirable method in terms of productivity and workability.

The present invention has been made in view of the current situation, and in the present invention, after the anode lead wire of the capacitor element is overlapped and welded on the anode external terminal, the anode lead wire is located outside the welded part of the anode lead wire. A cut is made in the section, and then the anode lead wire is bent at the cut and the unnecessary portion is cut off.

That is, in the present invention, as shown in FIG. 5, the anode leading wire 1a of the capacitor element 1 is placed over the wide anode external terminal 6, and after welding, as shown in FIG. A cradle 8 is placed below the terminal 6, and on the part of the anode lead wire 1a outside the welding part 9 to the anode external terminal 6,
A single blade 10 with an acute angle (θ < 90°) is arranged so that the vertical surface faces the capacitor element 1 side, and then the anode lead wire 1a is pressurized by the single blade 10 to form a cut 11.
By bending the anode lead wire 1a several times in the direction of the arrow in FIG. 6, the unnecessary portion is cut off. Note that 7 is a cathode external terminal connected by solder to the cathode conductive layer of the outermost shell of the capacitor element 1, and the tip of this cathode external terminal 7 is U-shaped to fit into the capacitor element 1.

Here, when providing the cut 11 in the anode lead wire 1a, in order to avoid scratching or cutting the cathode external terminal 6, a stopper is provided to prevent the single blade 10 from moving beyond a predetermined value.
Care must be taken to prevent the cutting edge of the blade from coming into contact with the surface of the anode external terminal 6.

In addition, by setting the hardness of the anode external terminal 6 to 180 or more on the Bitkers hardness scale, a thin and soft wire such as tantalum, niobium, or aluminum with a diameter of about 0.2 mm to 0.8 mm is usually used for the anode lead-out wire 1a, and the anode external terminal Since nickel, iron, or iron-nickel alloy with a thickness of 0.05 mm to 0.2 mm is used for the anode lead wire 1 when making the cut 11,
The cut 11 can be easily provided without stretching or distorting the part a.

Furthermore, the cut 11 may be 1/2 or more of the diameter of the anode lead wire 1a, but preferably 70 to 90
% is appropriate.

Further, the blade for making the cut 11 in the anode lead wire 1a is preferably an acute angle with an angle θ of 60° or less, and is preferably a single-edged blade 10 as in the above embodiment. At this time, as in the above embodiment, if the cut 11 is provided so that the vertical plane is on the side of the capacitor element 1, that is, the fixed welding part 9, the side to be cut is free, so the anode lead wire Since the wire 1a extends and lifts upward along the tapered portion of the single blade 10, it becomes easier to bend and separate the anode lead wire 1a.

Next, an example of the manufacturing process of a face bonding type chip-shaped solid electrolytic capacitor using the method of the present invention will be explained with reference to the drawings of FIGS. 7 to 13.

FIG. 7 is a diagram showing a state in which the anode lead wire 1a of the capacitor element 1 is welded to the anode external terminal 6.
A window 12 is provided in a portion of the anode external terminal 6 outside the welded portion 9 to which the anode lead wire 1a is welded. Further, as shown in FIG. 8, a plurality of capacitor elements 1 are attached to a long metal holding plate 13 at regular intervals by fixing the tips of the anode lead wires 1a by welding, and the anode The external terminal 6 and the cathode external terminal 7 are connected to the metal frame 1
The anode external terminal 6 and the cathode external terminal 7 are arranged to face each other at a constant interval. Further, the cathode external terminal 7 is fitted into the capacitor element 1.

After connecting the anode lead wire 1a to the anode external terminal 6 by welding as shown in FIG. 7, the wide single blade 10 is positioned over the window 12 of the anode lead wire 1a as shown in FIGS. 8 and 9. Apply pressure to the area to be
Cuts 11 are provided as shown in FIG. At this time, since the anode external terminal 6 is provided with a window 12,
The bending angle when the cut 11 is provided increases, the fatigue of the anode lead wire 1a increases, and the anode lead wire 1a can be easily separated.

After providing the cut 11 in the anode lead wire 1a in this way, the anode lead wire 1a is separated at the cut 11 as shown in FIG. It is connected to the cathode conductive layer of the outermost shell by solder 15. After this, as shown in FIG. 13, after partially covering the capacitor element 1, anode external terminal 6, and cathode external terminal 7 with insulating resin 16, the anode external terminal 6 and cathode external terminal 7 are The finished product is created by bending the exposed part into an L shape.

Here, in the above embodiment, a case was explained in which a wide anode external terminal 6 was used, but the first
It does not have to be wide as shown in Figure 4. Note that 17 is an anode external terminal, and 18 is a cathode external terminal, and the one shown in FIG. 14 is a three-terminal structure.

According to the manufacturing method of the present invention as described above, an unnecessary portion of the anode lead wire is cut off by making a cut in the anode lead wire and then bending it at the cut, thereby cutting the anode lead wire at once. Compared to the conventional method, which requires less machining accuracy during cutting, productivity can be increased, and since the equipment requires a simple structure, the equipment can be made cheaper. Obtainable.

In addition, in the present invention, the anode lead wire is stacked on the anode external terminal and then welded, and then the anode lead wire is made a cut, so when making the cut, the anode external terminal can be used as a stand. Moreover, when making a cut, the unnecessary part comes to the surface, making the cutting process much easier.

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views showing main steps in a conventional solid electrolytic capacitor manufacturing method, and FIGS. 3 and 4 are perspective views showing main steps in another conventional solid electrolytic capacitor manufacturing method. Figure 5 is a perspective view showing the main steps in the method for manufacturing a solid electrolytic capacitor according to the present invention;
FIG. 6 is a cross-sectional view showing the state during the same process, and FIG. 7 is a method for manufacturing a solid electrolytic capacitor according to an embodiment of the present invention, in which the anode lead wire of the capacitor element is connected to the anode external terminal. FIG. 8 is a perspective view showing the same condition when cuts are made in the anode lead wire, FIG. 9 is a cross-sectional view of the same, and FIG. 10 is the same after making cuts in the anode lead wire. A perspective view showing the state, FIG.
FIG. 12 is a perspective view showing a state in which a cathode external terminal is soldered to a capacitor element, FIG. 13 is a perspective view showing a finished product, and FIG. 14 is a perspective view of a solid electrolytic capacitor manufactured by the manufacturing method of the present invention. FIG. 7 is a perspective view showing another embodiment. 1... Capacitor element, 1a... Anode lead wire,
6... Anode external terminal, 7... Cathode external terminal, 9...
...Welded part, 10...Single edge, 11...Cut, 12
...Window, 15...Solder, 16...Insulating resin.

Claims (1)

[Scope of Claims] 1. By sequentially laminating a semiconductor metal oxide layer, a cathode layer, and a cathode conductive layer on an anode body having an anode lead wire and having a dielectric film formed by anodization on the surface. In the method for manufacturing a solid electrolytic capacitor, the method comprises forming a capacitor element, connecting plate-shaped anode external terminals and cathode external terminals to the anode lead-out wire and cathode conductive layer of the capacitor element, and then covering the anode with an insulating resin. After welding the lead wire over the anode external terminal, in this stacked state, attach the anode lead wire to the part of the anode lead wire located outside the welding part so that the vertical surface of the single edge is on the capacitor element side. A method for producing a solid electrolytic capacitor, which comprises making a cut in the anode, and then bending the anode lead wire at the cut to cut off an unnecessary part. 2. Claim 1, characterized in that a window is provided in a portion of the anode external terminal outside the portion to which the anode lead wire is welded, and a cut is provided in a portion of the anode lead wire located above the window. A method of manufacturing the solid electrolytic capacitor described. 3. The method of manufacturing a solid electrolytic capacitor according to claim 1, characterized in that the cut provided in the anode lead-out wire is 70 to 90% of the diameter of the anode lead-out wire.