JPH059930B2 - - Google Patents

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. 3a is a perspective view showing a conventional example of this type of solid electrolytic capacitor, and Fig. 3b shows a state in which this solid electrolytic capacitor is connected to a wiring board via solder, and shows the internal structure. FIG. 3 is a vertical cross-sectional view with the mechanism omitted.

Generally, a solid electrolytic capacitor has a solid electrolytic capacitor element (not shown), and the solid electrolytic capacitor element is covered with an exterior part 1 having a rectangular parallelepiped shape. An anode terminal 2 protrudes from the left side surface of the exterior portion 1 and is electrically connected to the anode body of the solid electrolytic capacitor element within the exterior portion 1 . Exterior part 1
An anode terminal 3 protrudes from the right side surface and is electrically connected to the cathode layer of the solid electrolytic capacitor element within the exterior part 1. 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 parts are bent inward at the center so as to follow the lower surface of the exterior part 1. has been
The respective terminals 2 and 3 are connected to the terminal portions 8a and 8b of the wiring board 7.
The structure is such that they are connected to each other via solders 9, 9.

The conventional processing method for bending the base ends of the anode and cathode terminals 2 and 3 of the solid electrolytic capacitor is as follows:
The exterior part 1 is fixed to a base or the like, and the base ends of both terminals 2 and 3, which protrude horizontally to the left and right, are pressed downward from above, so that the base ends of the terminals 2 and 3 are attached to the left and right sides of the exterior part 1. Bend it along both sides of the

<Problems to be Solved by the Invention> When the anode terminal of a solid electrolytic capacitor is bent at the base end using the conventional method described above, the bent portions 5a and 5b may be bent into an angular shape. When bent at an angle, cracks due to desired deformation are likely 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 proximal end may be caused by vibration during ultrasonic cleaning performed after being mounted on a wiring board, or by vibration of the equipment after the wiring board is mounted on the equipment. When exposed to vibrations. At this time, stress due to these vibrations is applied to the bent portions 5a of the base ends of the anode and cathode terminals,
5b, there is a problem that it may break at this bend.

<Means for Solving the Problems> The present invention has been made in view of the above problems, and provides a solid electrolytic capacitor in which an anode terminal and a cathode terminal protrude from an exterior portion housing a solid electrolytic capacitor element therein. and applying a resin to at least one surface of the base end portions of the anode terminal and the cathode terminal, respectively, and the base end portions of the anode terminal and the cathode terminal are coated with the resin so that the surface coated with the resin is on the inside. The process consists of the following steps:

<Operations and Effects> In this invention, resin is applied to one side of the base end portions of the anode and cathode terminals protruding from the exterior part, respectively.
The proximal ends of the anode terminal and cathode terminal are bent so that the resin-applied surface faces inside. Therefore, the applied resin bends together with the terminal and is sandwiched inside the bent part of the terminal, so that the bent part at the base end is gently bent. This makes it difficult for cracks to form on the outer surface of the bent portion, and furthermore, the bent portion is reinforced by the resin. Therefore, even after a solid electrolytic capacitor is mounted on a wiring board, subjected to ultrasonic cleaning vibrations, or mounted on a device,
This has the effect of preventing the bent portion from breaking even if it is subjected to vibrations due to vibrations of the device.

<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. FIGS. 1A, 1B, and 1C are diagrams showing the procedure for processing the terminals of a solid electrolytic capacitor, and will be described below in the order of the diagrams. First, a solid electrolytic capacitor having anode and cathode terminals 2 and 3 horizontally protruding from both sides of an exterior part 1 is manufactured by a conventionally known method. Before bending the base ends of the anode and cathode terminals 2 and 3 of this solid electrolytic capacitor,
Resin 6, 6 is applied to the lower surface of each proximal end (FIG. 1a). Next, the anode and cathode terminals 2 and 3 are bent at a right angle approximately in the center so that the tips thereof are directed downward (FIG. 1b). Furthermore, connect the terminals 2 and 3 so that the tips of the anode and cathode terminals 2 and 3 are along the bottom surface of the exterior part 1.
Bend the proximal end portions along the left and right side surfaces of the exterior part 1 (FIG. 1c). However, this procedure shows an example in which the anode and cathode terminals 2 and 3 are bent downward at approximately the center, and then the base ends of each terminal 2 and 3 are bent downward, but the anode and cathode terminals After the base end portions of terminals 2 and 3 are bent downward, approximately the center of each terminal 2 and 3 may be bent at a right angle.

According to the above-described procedure, when the base ends of the terminals 2 and 3 of the solid electrolytic capacitor are bent downward, the resins 6 and 6 applied to the lower surfaces of the base ends are bent downward.
The resins 6, 6 are sandwiched inside the bent portions 5a, 5b formed at the base ends of the terminals 2, 3,
The bent portions 5a and 5b are formed into gentle bends without being angular, and cracks due to plastic deformation are less likely to occur on the outer surfaces of the bent portions 5a and 5b.

Synthetic or natural resin can be used for this resin 6, but when the terminals 2, 3 are bent, the resins 6, 6 bend together with the terminals 2, 3, and the bent portions 5a, 5
By being sandwiched inside of b, the bent portions 5a,
The resin 6 needs to have a hardness that allows the resin 6 to be gently bent without making it angular.

In this embodiment, resins 6 and 6 are applied to the lower surfaces of the proximal ends of the terminals 2 and 3, but the resins 6 and 6 may be applied to a wider area than the lower surfaces of the proximal ends, or may be applied to the lower surfaces of the proximal ends and the lower surfaces of the proximal ends. It may also be applied to the top surface.

FIG. 2a is a perspective view of a solid electrolytic capacitor whose base ends of terminals 2 and 3 have been treated according to the procedure of the present invention, and FIG.
FIG. 3 is a diagram showing a state in which the terminals 8a and 8b of a wiring board 7 are mounted via solders 9 and 9, and the internal mechanism is omitted. As shown in this figure, after a solid electrolytic capacitor is mounted on a wiring board 7 and subjected to vibrations due to ultrasonic cleaning, or after a wiring board 7 is mounted on a device and receives vibration from the device, the terminal Although stress due to vibrations is concentrated on the bent portions 5a, 5b at the proximal ends of 2 and 3, cracks are less likely to occur in the bent portions 5a, 5b, and the applied resin 6, 6
Since the bent portions 5b are reinforced, the bent portions 5a and 5b are prevented from breaking.

[Brief explanation of the drawing]

Figures 1a, b, and c are diagrams showing an embodiment of the terminal treatment method of a solid electrolytic capacitor of the present invention, Figure 2a is a perspective view of a solid electrolytic capacitor completed by the treatment method of the invention, and Figure 2a is a perspective view of a solid electrolytic capacitor completed by the treatment method of the invention. Figure b is a vertical cross-sectional view with the internal mechanism omitted showing the solid electrolytic capacitor mounted on a wiring board, Figure 3 a is a perspective view of a solid electrolytic capacitor with terminals bent by the conventional method, and Figure 3 b. 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. DESCRIPTION OF SYMBOLS 1... Exterior part, 2... Anode terminal, 3... Cathode terminal, 5a... Bending part on the anode terminal side, 5b... Bending part on the cathode terminal side, 6... Resin.

Claims (1)

[Claims] 1. A step of manufacturing a solid electrolytic capacitor in which an anode terminal and a cathode terminal protrude from an exterior part housing a solid electrolytic capacitor element therein, and a step of manufacturing a solid electrolytic capacitor in which an anode terminal and a cathode terminal protrude from an exterior part housing a solid electrolytic capacitor element therein, and a 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 therein, and a 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 therein, and a 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 therein, and a 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 at least one surface of the base end part of the anode terminal and cathode terminal, respectively. A method for processing a terminal of a solid electrolytic capacitor, comprising the steps of applying a resin, and bending the base end portions of the anode terminal and the cathode terminal so that the resin-applied surface faces inside.