JPS609339B2 - Manufacturing method of rectangular electrolytic capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a rectangular electrolytic capacitor suitable for use on a printed circuit board.

In recent years, with the increasing use of printed wiring on electronic component boards, there has been a growing trend toward thinner electronic components, and electrolytic capacitors are also facing this trend. In general, electrolytic capacitors aimed at thinning are cylindrical as disclosed in the Jitsukoseki 54-2032 Design Bulletin, and the sealing means in this case is to use a sealing plate or a rubber stopper for the case. It is made by joining the inside of the entrance and wrapping the tip of the opening □.

However, in order to reduce the thickness of these cylindrical structures, the width of the anode foil and cathode foil constituting the element is considerably narrowed, making it extremely difficult to mass-produce the desired wound element by preventing winding misalignment. In addition, the cylindrical shape requires a large area on the printed circuit board, and cannot be said to satisfy the demands for high-density packaging of electronic components. For this reason, attempts have been made to make the capacitor element flat and at the same time make the case square, but in this case the important point is how to seal the opening. Generally, in the case of a rectangular shape, the tip of the closing part of the case body 1 and the periphery of the upper cover 2 are rolled up using a seaming machine as shown in FIG. Although these methods can easily be used for relatively large capacitors, seaming is required for relatively small capacitors with a diameter of only 20 to 3 cm, such as the rectangular electrolytic capacitor to be obtained by the present invention. Mechanical sealing is almost impossible. The present invention has been made in view of the above-mentioned points, and is provided with an enlarged part extending outward from the opening part of a rectangular case that accommodates a flat capacitor element, and a tongue piece extending vertically upward from the enlarged part. Separator inside,
The elastic body and the lid plate are sequentially drilled, and then the case is iron-inserted into a metal jig that has a recess with an inner diameter slightly larger than the outer diameter of the case, and the lid plate is gradually pressed with a press fitting. A method for manufacturing a flat rectangular electrolytic capacitor suitable for use in printed circuit boards with excellent characteristics, in which the expanded portion is compressed to the same size as the outer diameter of the case while being pressed, and the tongue piece is bent inward to seal and fix it in a straight line. We aim to provide the following.

Embodiments of the present invention will be described below with reference to the drawings.

That is, as shown in FIG. 2, a flat capacitor element 11 is obtained by interposing a smoother between an anode foil and a cathode foil, winding the winding core a necessary number of times using a relatively thick core, and then compressing it into a flat shape.
form. Next, after soaking the electrolyte into the capacitor element 11, the lead terminal 1 is drawn out from the capacitor element 11.
2a and 12b in the direction of the flat surface formed by compressing the capacitor element 11, and roughly pull out the lead terminal 1.
The capacitor element 11 is bent again in a direction perpendicular to the flat surface of the capacitor element 11 in accordance with the required terminal spacing between the capacitor elements 2a and 12b. Then, the capacitor element 11 is housed in a square case 13 made of aluminum. As shown in FIG. 3, the rectangular case 13 has an expanded portion 14 extending outward around the entrance and the expanded portion 1.
A tongue piece 16 is provided that extends vertically upward from 4. Therefore, inside the expanded portion 14 of the square case 13, as shown in FIG.
As shown in B, the lead terminal insertion hole 16a is made of a chlorine-free material such as aluminum, pressboard, or resin.
, 16b is arranged, and on the separator 17, as shown in FIGS. 5A and 5B, a 7-bar 18 is formed on the outer periphery of the separator 7 to match the widened portion 14. An elastic body 20 provided with protrusions 19a and 19b is placed thereon.
Reference numerals 21a and 21b are lead terminal insertion holes. Next, as shown in FIGS. 6A and 6B, the elastic body 20 is coated with a metal such as aluminum or a synthetic resin such as epoxy, polypropylene, polyethylene, polysulfone, vinyl chloride, phenol, polycarbonate, ABS, polyamide, etc. A rectangular lid plate 23 made of synthetic resin mixed with flame retardants such as titanium oxide and bromine, and having convex through holes 22a and 22b with an inverted dish-like circumference at necessary locations on the surface is mounted on the plate. The elastic body 2 is inserted into the convex through holes 22a and 22b.
The convex portions 19a and 19b of 0 are brought together. In this case, the lead terminals 12a and 12b are connected to the separator 17.
The terminal insertion holes 16a and 16b of the elastic body 20, the terminal insertion holes 21a and 21b of the elastic body 20, and the square plate cover plate 23 are passed through the convex through holes 22a and 22b and drawn out to the outside. Then, as shown in FIG. 7, the bottom part of the square case 13 is carried into a metal jig 25 which has a recess with an inner diameter slightly larger than the outer diameter of the square case 13 and a tapered part 24 at the entrance. A press holder 27 with a tongue bending tool 26 arranged around it is placed on the cover plate 23, and the press holder 27 is gradually pressed into the metal jig 25 as shown in FIG. 8 to open the expanded portion. 14 is compressed to the same size as the outer diameter of the case 13 and made into a straight line, at the same time the tongue piece 15 is bent inward to form the entrance part of the square case 13 and the pull-out terminals 12a, 12.
After sealing the externally drawn portion of b, the capacitor is taken out from the metal pick-up 25 to obtain a rectangular electrolytic capacitor 28 as shown in FIG. According to the manufacturing method of the flat rectangular current capacitor constructed as described above, the elastic body 20 inserted into the expanded portion 14 provided at the opening 0 of the square case 13 forms the expanded portion 14 in a linear shape. The airtightness around the closing part can be maintained by compression when doing so.

In addition, two elastic bodies are provided in the pull-out terminal insertion holes 21a and 21b.
The outside is made up of plate-shaped protrusions 19a, 19b, and is iron-fitted to the inverted plate-shaped protrusion-shaped through holes 22a, 22b of the square cover plate 23, so that the pull-out terminals 12a, 12b are arranged during compression. As the compressive force concentrates toward the center in the direction of the air, this area can be completely sealed. In addition, 15 tongue pieces
Since the elastic body 20 and the rectangular cover plate 23 are bent inward, the elastic body 20 and the rectangular cover plate 23 do not fly off over a long period of time, and this has the advantage that it can be applied to any shape by simply changing the size of the metal jig 25 as appropriate. . In the above embodiment, the explanation was limited to the case where the dish-shaped protrusions on the elastic body were formed only on the surface, but as shown in FIG. Using the provided elastic body 30, as shown in FIG.
If a separator 32 provided with portions a and 31b is used, as shown in FIG. 12, the pull-out terminal 33 portion will be compressed by the elastic members 3 at two upper and lower locations, and the sealing performance of this portion will be further improved. As described above, according to the present invention, a widened part extending outward around the entrance part of a rectangular case that houses a flat capacitor element, and a tongue piece extending upward substantially perpendicularly from the widened part are provided, and a separator is provided in the widened part. The elastic body and the rectangular lid plate are sequentially inserted, and then the case is iron-fitted into a metal pick-up which forms a recess with an inner diameter slightly larger than the outer diameter of the case and has an entrance or a tapered part, and the rectangular lid is assembled. While gradually pressing the press tool that is attached to the plate, the expanded portion is compressed to the same dimension as the outer diameter of the case and made straight, and at the same time, the tongue is folded by the tongue bending tool installed on the press tool. It is possible to provide a method for manufacturing a flat rectangular electrolytic capacitor, which ensures sealing by bending the pieces inward, has good workability, and is particularly applicable to small rectangular shapes.

[Brief explanation of the drawing]

Fig. 1 is a cutaway sectional view showing the sealed part of a rectangular electrolytic capacitor manufactured by a conventional manufacturing method, and Figs. 2 to 9 are related to an embodiment of the present invention, and Fig. 2 is a configuration of a rectangular electrolytic capacitor. 3 is a sectional view showing the square case, 4A and 4B are sectional views showing the separator, A is a plan view, B is a sectional view, 5A and 5B are elastic bodies, and A is a plane. Figure B is a sectional view, Figures 6A and B are square lid plates, A is a plan view, B is a sectional view, Figures 7 to 9 are assembled, and Figure 7 is a metal jig fitted with iron. 8 is a sectional view showing the state when pressed against a metal odor control, FIG. 9 is a sectional view showing a rectangular electrolytic capacitor, and FIGS. 10 to 12 are other embodiments of the present invention. 10 is a sectional view showing an elastic body, FIG. 11 is a sectional view showing a separator, and FIG. 12 is a cutaway sectional view showing a sealed portion of a rectangular electrolytic capacitor. DESCRIPTION OF SYMBOLS 11... Flat capacitor element, 13... Square case, 14... Expanded part, 15... Tongue piece, 17, 32...
...Separator, 18...Taper, 19a, 19b, 29
a, 29b... dish-shaped convex super, 20, 30... elastic body,
23... Square lid plate, 25... Metallic smell, 26...
Tongue folded portion, 27...pressing tool, 31a, 31b.
...Dish-shaped through hole, 22a, 22b... Reverse dish-shaped convex through hole. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Scope of Claims] 1. A means for forming a knitted flat capacitor element by winding and compressing the anode foil and the cathode foil with a spacer in between; means for housing in a rectangular case provided with a tongue piece extending vertically upward from the expanded portion; a separator provided with a pull-out terminal insertion hole in the expanded portion; a taper on the outer periphery; and dish-shaped protrusions provided at necessary locations on the surface. An elastic body provided with a lead-out terminal insertion hole penetrating the dish-shaped protrusion and a rectangular cover plate provided with convex-shaped through holes with an inverted dish-like circumference at required locations on the surface are sequentially inserted into the dish-shaped protrusion. means for fitting the convex through-hole into the convex through-hole and at the same time pulling out the lead-out terminal led out from the capacitor element to the outside through the lead-out terminal insertion hole and the convex through-hole; Fit the square cover plate into a metal jig with a slightly larger inner diameter and press the square cover plate with a press tool to compress the expanded part to the same size as the square case outer shape and make it straight, and at the same time push the tongue piece inward. A method for manufacturing a flat rectangular electrolytic capacitor, comprising means for sealing the opening of the rectangular case by bending and the lead-out portion of the lead-out terminal. 2. Disc-shaped through holes are provided at necessary locations on the separator, and symmetrical convex projections are provided on both sides of the elastic body on both sides, and the disc-shaped convexities located on the back surface of the elastic body are provided in the disc-shaped through holes. 2. A method of manufacturing a rectangular electrolytic capacitor according to claim 1, wherein the capacitors are fitted with each other.