JPH0471330B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a vertical electrolytic capacitor that can be mounted on a printed circuit board using a reflow soldering method or the like.

(2) Conventional technology In recent years, electronic devices have become smaller, lighter, denser,
As the trend towards higher reliability progresses, printed circuit boards that are thinner and more flexible, and those that use metal plates with good thermal conductivity, are being developed and used.

Also, chip parts have been developed in the field of electronic parts, and among the capacitors mounted on the above-mentioned printed circuit boards, chip-type ceramic capacitors and tantalum capacitors are increasingly being used. In the case of electrolytic capacitors, since the capacitor element is impregnated with electrolyte, a double exterior has been devised, such as encasing the capacitor element in an aluminum case and then molding it and encasing it in resin. .

On the other hand, as shown in FIGS. 3 and 4, a vertical electrolytic capacitor has been devised in which the lead-out leads 2 and 3 of an electrolytic capacitor housed in a cylindrical metal case 5 are bent at the base. 7 is an insulating stand. (Utility Model Application Publication No. 50-98233, etc.) (3) Problems to be Solved by the Invention The above-mentioned double-exposed electrolytic capacitor had the problem of being large in external size and expensive.
In addition, the vertical electrolytic capacitors shown in Figures 3 and 4 have a structure in which the bent portions of the lead-out leads 2 and 3 and their vicinity are in close contact with the printed circuit board when mounted on the printed circuit board, so when cleaning the circuit board, It is difficult to remove solder flux, dirt, etc. that have entered the mounting surface of the capacitor, and if the cleaning time is extended to remove them, the detergent will penetrate into the inside of the elastic sealing body 4, and the aluminum foil etc. that make up the capacitor element 1 will be damaged. There were problems such as corrosion. Furthermore, since the capacitor body is cylindrical, when it is mounted on a printed circuit board using an automatic mounting machine, there are problems such as the capacitor rotating and shifting from its mounting position or falling off.

(4) Means for solving the problem The present invention solves the above-mentioned problem.
An electrolytic capacitor that is inserted into a lead insertion hole provided in an elastic sealing body, housed in a cylindrical metal case, and sealed by tightening the opening of the case,
The above-mentioned lead-out lead is bent at its base, and the above-mentioned metal case is fitted in contact with the inner surface of an insulating tube having at least four outer surfaces and a plurality of notches on one end surface thereof, which can be held in pressure contact from four directions. ,
Insert the bent lead lead into the notch,
The distance between the end face of the insulating tube and the outer surface of the elastic sealing body is 0.3
This is a vertical electrolytic capacitor characterized by being configured so that the capacitance is larger than mm.

(5) Function Since the outer surface of the elastic sealing body can be mounted above the printed circuit board by 0.3 mm or more, flux, dirt, etc. near the bent base of the lead lead can be easily removed outward through the notch provided in the insulating tube. can. It has four outer surfaces and can be held in pressure contact from four directions in a cross-shape from the outside to the center, so when holding, moving and mounting capacitors using an automatic printed circuit board mounting machine, the capacitors can be completely fixed. It has an action that can be maintained.

(6) Examples Hereinafter, the present invention will be explained using examples shown in FIGS. 1 and 2.

Figure 1A is a cross-sectional view of a vertical electrolytic capacitor, Figure 2 is a bottom view of the vertical electrolytic capacitor, and Figure 2 is an explanatory diagram of the assembly of the vertical electrolytic capacitor. 3
is inserted into the insertion hole provided in the elastic sealing body 4, and is housed in the metal case 5, and the opening of the outer case is tightened and sealed. Next, the lead-out leads 2 and 3 are flattened at the root portions pulled out from the elastic sealing body 4, and then shaped so that the bending dimension L is 0.5 mm or more. 6 is
It is an insulating cylinder made of heat-resistant thermoplastic synthetic resin such as PBT, PET, ABS, and PPS, and its outer surface is attached by pressure contact from four directions from the outside to the center in a cross shape as shown by the arrows in Figure 1. At least four outer surfaces 6a, 6b, 6c, 6d are formed, and a plurality of cutouts 6e are integrally formed on one end surface thereof. Next, the metal case 5 of the capacitor mentioned above.
The above-mentioned insulating tube 6 is fitted onto the insulating tube 6. At this time, the metal case 5 is inserted in contact with the inner surface of the insulating tube 6, fixed at a position where the distance H between the end surface of the insulating tube 6 and the outer surface of the elastic sealing body 4 as shown in FIG. The bent lead-out leads 2 and 3 are inserted into the notches 6e and cut or further bent upward as shown in FIG. 1A.

For example, aluminum case diameter 4φ x length 5mm
When using, the thickness of the insulating tube is preferably 0.3 to 0.8 mm. Also, it is desirable that the inner dimension of the insulating cylinder be the same as the diameter of the case or 0.1 to 0.2 mm smaller.

In addition, although the above-mentioned embodiment described an insulating cylinder having a rectangular shape having four outer surfaces,
It may also be angular.

Further, the bending process at the bases of the lead wires 2 and 3 may be performed after the insulating cylinder 6 is fitted. The relationship between the dimensions H and L described above is preferably H≧L.

(7) Effects of the Invention The vertical electrolytic capacitor of the present invention can completely clean the printed circuit board in a short time due to the above-mentioned action, and the detergent does not penetrate into the elastic sealing body, making it an extremely reliable capacitor. is obtained.

Furthermore, when mounting using an automatic mounting machine, the capacitor body can be securely held from four directions, which prevents the capacitor from falling off or rotating, resulting in high precision and greatly improved production efficiency. This is particularly useful when assembling products packaged in tape with multiple square recesses.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the vertical electrolytic capacitor of the present invention, A is a sectional view, B is a bottom view, Fig. 2 is an explanatory diagram of assembly of the vertical electrolytic capacitor of the invention, and Figs. 3 and 4 are FIG. 3 is a cross-sectional view of different conventional vertical electrolytic capacitors. 1: Capacitor element, 2, 3: Drawer lead,
4: elastic sealing body, 5: cylindrical metal case, 6: insulating tube, 6a, 6b, 6c, 6d: four outer surfaces of insulating tube, 6e: notch.

Claims (1)

[Claims] 1. An electrolytic capacitor in which the lead-out leads led out from the capacitor element in the same direction are inserted into lead insertion holes provided in an elastic sealing body, housed in a cylindrical metal case, and sealed by tightening the opening of the case. , the above-mentioned pull-out lead can be bent at the base exit and attached by pressure contact from four directions.
The above-mentioned metal case is fitted in contact with the inner surface of an insulating tube having two outer surfaces and a plurality of notches on one end surface thereof, and the bent lead-out lead is inserted into the notch, and the end surface of the insulating tube and , a vertical electrolytic capacitor characterized in that the distance between the elastic sealing body and the outer surface is 0.3 mm or more.