JPH01230218A - How to treat solid electrolytic capacitor terminals - Google Patents

Abstract

PURPOSE:To prevent the yield of cracks at the outer surfaces of bent parts and to prevent breakdown due to vibration, by bending the base parts of protruding anode terminal and cathode terminal in a round pattern. CONSTITUTION:Terminals 2 and 3 protruding from a packaged part 1 are bent downward at the central parts of the terminals at right angles. Auxiliary members 6 are arranged vertically with respect the paper in contact with the packaged part 1. Then the tips of the terminals 2 and 3 are bent along the lower surface of the packaged part 1. Thereafter, the auxiliary members 6 are removed from bent parts 5a and 5b. In this constitution, the terminals 2 and 3 are bent along the outer surfaces of the cylindrical auxiliary members 6. Therefore, cracks due to plastic deformation are hard to occur on the outer surface sides of the bent parts 5a and 5b. Even if the terminals receive vibration after mounting and stress is concentrated to the bent parts 5a and 5b, the terminals are not broken since there is no crack.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to processing of terminals of solid electrolytic capacitors in which the bent portions of the terminals protruding from the exterior portion housing the capacitor elements of the solid electrolytic capacitors are formed into gentle bends. Regarding the method.

<Prior art> Fig. 3(a) is a perspective view showing a conventional example of this type of solid electrolytic capacitor, and Fig. 3(b) shows the solid electrolytic capacitor connected to a wiring board via solder. It is a vertical cross-sectional view in which the internal mechanism is omitted.

In general, a solid electrolytic capacitor has a solid electrolytic capacitor element (not shown), and the solid electrolytic capacitor element is covered with an exterior part l having a rectangular parallelepiped shape. An anode terminal 2 protrudes from the left side surface of the exterior portion l, and is electrically connected to the anode body of the solid electrolytic capacitor element within the exterior portion l. A cathode and a terminal 3 protrude from the right side of the exterior part l, and are electrically connected to the cathode layer of the solid electrolytic capacitor element within the exterior part l. In this solid electrolytic capacitor, the base ends of the anode and cathode terminals 2 and 3 are bent along the left and right side surfaces of the exterior part 1, and the tip sides are bent inward at the center so as to follow the lower surface of the exterior part 1. The terminals 2.3 are connected to the terminal portions 8a, 8b of the wiring board 7 via solders 9.9.

The conventional method for bending the base ends of the anode and cathode terminals 2.3 of the solid electrolytic capacitor described above involves fixing the exterior part l to a base, etc., and bending both terminals that protrude approximately horizontally to the left and right. There is a method in which the base end portions of 2.3 are pressed downward from above and bent along both left and right side surfaces of the exterior portion l.

<Problems to be Solved by the Invention> When the anode and cathode terminals of a solid electrolytic capacitor are bent at the base end using the conventional method described above, this problem tends to occur on the outer surfaces of the bent portions 5a and 5b. Solid electrolytic capacitors with cracks in the bent portions 5a and 5b of the base end may be damaged during ultrasonic cleaning after being mounted on a wiring board, or when the equipment vibrates after the wiring board is mounted on a device. , it receives vibration. At this time, the stress caused by these vibrations is concentrated on the cracked bent portions 5a and 5b at the proximal ends of the anode and cathode terminals.
There is a problem that a, 5b'r may break.

<Means for Solving the Problems> The present invention has been made in view of the above-mentioned problems. a step of manufacturing a capacitor; a step of applying the rounded portion of the auxiliary member having the rounded portion to one side of the base end of the foot electrode terminal and the cathode terminal, respectively; The proximal end of 1- is flush with the auxiliary member applied.

and removing the foot electrode terminal and the cathode terminal from the inside of the bent portion of the proximal end.

Effects and Effects> In the present invention, the rounded portion of the auxiliary member is applied to one side of the proximal end portions of the anode terminal and the cathode terminal protruding from the exterior part, and the side to which the auxiliary member is applied is placed on the inner side. The proximal ends of the anode terminal and the cathode terminal are bent along the circumferential surface of the rounded part of the auxiliary member so that

Therefore, the bent portion at the base end is bent with a gentle roundness.

By gently bending the bent portion at the base end in this manner, cracks are less likely to form on the outer surface of the bent portion. Therefore, after being mounted on a solid electrolytic capacitor or wiring board,
Even if it is subjected to vibrations from ultrasonic cleaning, or even if it is subjected to vibrations due to the vibrations of the device after being mounted on the device, it has the effect of preventing the bent portion from breaking.

<Example> An example of the present invention will be described with reference to FIGS. 1 and 2.

In the solid electrolytic capacitor of this embodiment, parts equivalent to those shown in the conventional example are indicated by the same reference numerals in the drawings, and detailed description thereof will be omitted. Figure 1 (a), (b), (C), (d
) is a diagram showing a procedure for processing terminals of a solid electrolytic capacitor, and will be described below in the order of the diagrams. First, the anode and cathode terminals 2.
3. A solid electrolytic capacitor protruding from the water is manufactured (Fig. 1(a)).

The anode and cathode terminals 2.3 of this solid electrolytic capacitor are bent at a right angle approximately in the center so that their tips point downward. Next, align the central axis of the short cylindrical auxiliary member 6 in a direction perpendicular to the plane of the drawing, and align the side surface of the auxiliary member 6, the lower surface of the proximal end of the terminal 2, and the left side surface of the exterior part l. Place it so that it is in contact with. Further, an auxiliary member 6 different from this auxiliary member 6 and having the same shape is arranged so as to be in contact with the lower surface of the base end of the terminal 3 and the right side surface of the exterior part 1 (FIG. 1(b)). Next, member 6
．． It is bent downward at a substantially right angle along the circumferential surface of 6. However, when bending the proximal end of the terminal 2.3 downward, the auxiliary member 6.6 is held by a suitable holder (not shown) so that it does not shift from the position where it was placed. Figure 1 (C))
. Then, remove the two wooden auxiliary members 6.6 from inside the bent portions 5a and 5b at the proximal ends of both terminals 2.3 (Fig. 1(d)).
).

According to the procedure followed, both terminals 2.3 are bent along the circumferential surface of the cylindrical auxiliary member 6°6, so that the bent portions 5a,
Both the inner and outer sides of 5b are formed into a gentle bend without being angular, and this bent portion 5a.

Cracks due to plastic deformation are less likely to occur on the outer surface of 5h.

However, this procedure is an example in which the anode and cathode terminals 2.3 are bent downward at approximately the center and then bent downward at the base end of each terminal 2.3, or the anode and cathode terminals 2. After bending the proximal end of each terminal 2.3 downward, approximately the center of each terminal 2.3 may be bent at a right angle. Further, in this embodiment, the auxiliary member 6 may have a so-called U-shaped structure formed integrally with the auxiliary member 6 at a distance. In fact, the auxiliary member has a rounded part that can be applied to the lower surface or two surfaces of the proximal ends of the anode and cathode terminals 2.3, and when applied, the respective terminals 2. By bending the proximal end of , 3 downward or to one side so that the surface to which the auxiliary member is applied is on the inside, the bent part will have a gentle roundness along the rounded part of the auxiliary member. It is sufficient that the auxiliary member can be removed from the inside of each proximal end after being bent in this manner.

FIG. 2(a) is a perspective view of a solid electrolytic capacitor in which the base end of the terminal 2.3 is treated according to the procedure of the present invention, and FIG. 2(b) is a perspective view of the terminal 2.3 of the solid electrolytic capacitor and the wiring board. 7 is a diagram illustrating a state where the device is mounted on terminal portions 8a and 8b of No. 7 via solder 9, and the internal mechanism is omitted. As shown in this figure, after the solid electrolytic capacitor is mounted on the wiring board 7, the wiring board 7
When vibration is received from this equipment after it has been installed in a device,
The terminals 2.3 are bent to prevent stress from vibration from concentrating on the bent portions 5a, 5b at the base end, or to prevent cracks from occurring in the bent portions 5a, 5b, thereby preventing breakage of the bent portions 5a, 5b. It will be IFed.

[Brief explanation of the drawing]

FIGS. 1(a), (b), (C), and (d) are diagrams showing an embodiment of the method for treating terminals of a solid electrolytic capacitor of the present invention, and FIG. 2(a) is a diagram showing an example of the treatment method of the same invention. FIG. 2(b) is a vertical cross-sectional view showing the solid electrolytic capacitor of the invention mounted on a wiring board with the internal mechanism omitted, and FIG. 3(a) is a perspective view of the solid electrolytic capacitor completed by FIG. 3(b) is a perspective view of a solid electrolytic capacitor with terminals bent by this method, and is a vertical cross-sectional view with internal mechanisms omitted, showing a state in which the conventional solid electrolytic capacitor is mounted on a wiring board. l...exterior part, 2...anode terminal, 3...cathode terminal, 5a...bending part on the anode terminal side, 5b...
- Bent part on the cathode terminal side, 6... Auxiliary member. , pa

Claims (1)

[Claims] (1) The step of manufacturing a solid electrolytic capacitor in which an anode terminal and a cathode terminal protrude from an exterior part that houses a solid electrolytic capacitor element inside, and the step of manufacturing a solid electrolytic capacitor in which an anode terminal and a cathode terminal protrude from an exterior part that houses a solid electrolytic capacitor element, and a step in which the rounded part of an auxiliary member having a rounded part is manufactured. applying the proximal ends of the anode terminal and the cathode terminal to one surface of each, and adjusting the roundness of the auxiliary member so that the proximal end of the anode terminal and the cathode terminal are placed on the inner side of the auxiliary member; A method for processing a terminal of a solid electrolytic capacitor, comprising the steps of: bending the terminal along a circumferential surface of a certain portion; and removing the auxiliary member from inside the bent portion of the proximal end of the anode terminal and the cathode terminal.