JPH0246031Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a chip-type electrolytic capacitor.

[Technical background of the invention and its problems] A conventional chip-type electrolytic capacitor is known, for example, as described in Japanese Patent Laid-Open No. 59-211213. That is, as shown in FIG. 4, a capacitor element with lead wires 41 drawn out in the same direction inserted through a sealing plug is housed in a metal case 42, and the opening edge of the metal case 42 is tightened.

An insulating plate 44 having a through hole through which the lead wire 41 passes and a recess 43 connected to the through hole is placed on the sealing plug of the electrolytic capacitor body constructed in this way, and the recess 43 is provided with a recess 43 for the lead wire. 41
The tip is bent so that it fits within the recess 43. In this configuration, the lead wire 41
Since the tip of the capacitor is housed in the recess 43 provided in the insulating plate 44, there is no protrusion at all on the surface that contacts the printed circuit board, etc., so the capacitor is stable without tilting or wobbling. has. However, in these electrolytic capacitors, cream solder is applied to the bent tip of the lead wire 41 and it is brought into contact with the board, or cream solder is printed on a printed circuit board and the lead wire 41 of the electrolytic capacitor is placed on the cream solder. By touching the bent tip of the board and heating the board, the cream solder is melted and fixed. During this melting, the air in the recess 43 is heated and expanded, and the expanded air causes the capacitor to float up.
In some cases, the position may move, resulting in incomplete or poor connection.

[Purpose of the invention] The purpose of this invention is to provide a chip-type electrolytic capacitor that does not cause incomplete or poor connection to the board even when air expands during soldering. .

[Summary of the invention] The electrolytic capacitor of this invention consists of a capacitor body in which a lead wire terminal unidirectional capacitor element and an elastic sealing plug into which the lead wires of the capacitor element are inserted are housed and sealed in a metal case, and a capacitor body which is sealed by housing the elastic sealing plug into which the lead wire of the capacitor element is inserted; an insulating plate having a through hole disposed in the lead wire and passing through the lead wire, the insulating plate having a notch that is narrower than the diameter of the lead wire that communicates with the through hole from a side surface of the insulating plate; The lead wire is bent to a length halfway through the cut.

[Example of the invention] As shown in Fig. 1, aluminum is roughened to form a dielectric oxide film, and then the anode foil and the aluminum foil are roughened and the lead wire 3 is connected to the anode foil to which the lead wire 2 having the lead wire 1 is connected. A capacitor element 5 is formed by winding the cathode foil to which the lead terminal 4 is connected via capacitor paper.
Configure. The capacitor element 5 is impregnated with a driving electrolyte, and the lead terminals 2 and 4 of the capacitor element 5 are
is inserted into the elastic sealing plug 6, the capacitor element 5 and the elastic sealing plug 6 are housed in a metal case 7, the open end of the metal case 7 is tightened, and the body portion near the open end is pressed and wound. A tightening portion 8 and a pressing portion 9 are formed and sealed. The impregnation with the driving electrolyte may be performed after the lead terminals 2 and 4 of the capacitor element 5 are inserted into the elastic sealing plug 6. Further, by adhering or placing a terminal plate 10 made of a rigid body on the upper surface of the elastic sealing plug 6, the tensile force applied to the lead wires 1 and 3 can be prevented.

The lead wire 1,
The insulating plate 1 has a through hole 11 through which the insulating plate 3 is inserted.
2, the insulating plate 12 has a notch 13 that reaches the through hole 11 from its side surface. The notch 13 is narrower than the outer diameter of the lead wires 1 and 3, and the lead wires 1 and 3 are bent onto the notch 13, but the length of the lead wires 1 and 3 is smaller than the notch. The dimensions are set to the middle of 13. The lengths of the lead wires 1 and 3 may be set by cutting them to a set length before the bending process or after the bending process. In such an electrolytic capacitor, even if the lead wires 1 and 3 are bent onto the notch 13, they will not fall into the notch 13 because they are narrower than the lead wires 1 and 3, and the electrolytic capacitor can be bent onto the board with cream solder. When fixing the cream solder to the insulating plate 12, the air expanded between the insulating plate 12 of the electrolytic capacitor and the electrodes of the board, which is generated during heating to melt the cream solder, is released through the notches 13 provided in the insulating plate 12, and especially the lead wires 1 and 3 are cut. Since the length of the notch 13 is set halfway, the portion of the notch 13 that is longer than the length of the lead wires 1 and 3 is completely open and becomes a passage, allowing air to easily escape. This prevents the electrolytic capacitor from lifting or moving due to expanded air, which was a drawback in the prior art. Furthermore, since the lead wires 1 and 3 are set to a length halfway up the notch 13, the cream solder melts from the cross section of the lead wires 1 and 3, that is, from the direction of the cut surface, and easily connects the lead wires 1 and 3. Since it also penetrates into the back side, it has the advantage of providing strong connection strength. Therefore, it is possible to prevent incomplete or poor connection between the electrodes of the substrate and the electrolytic capacitor.

The terminal plate 10 has the effect of not transmitting the tensile force to the lead wires 1, 3, which is generated when the lead wires 1, 3 are bent, to the connection portion between the anode foil or the cathode foil and the lead-out terminals 2, 4. Further, as shown in FIG. 2, the notches 23 of the insulating plate 22 may be provided in the same direction, or as shown in FIG. 3, the notches 33 of the insulating plate 32 may be provided in the opposite direction.

[Effects of the invention] By using the chip-type electrolytic capacitor of this invention, it is possible to prevent the electrolytic capacitor from lifting up or shifting due to the expansion of air that occurs when it is fixed to a board, and to eliminate incomplete connections and poor connections. The effect that can be obtained is obtained.

[Brief explanation of the drawing]

Figure 1 is a front sectional view showing one embodiment of the electrolytic capacitor of the present invention, Figures 2 and 3 are plan views showing other embodiments of the insulating plate of the present invention, and Figure 4 is a conventional one. It is a perspective view showing an electrolytic capacitor. 1, 3... Lead wire, 2, 4... Output terminal, 5
... Capacitor element, 6 ... Elastic sealing plug, 7 ...
Metal case, 10...Terminal board, 11...Through hole,
12...Insulating plate, 13...Notch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A capacitor body in which a capacitor element with lead wire terminals in the same direction and an elastic sealing plug into which the lead wires of the capacitor element are inserted are housed and sealed in a metal case, and an insulating plate having a through hole disposed therethrough and passing through the lead wire, the insulating plate having a notch having a width narrower than the diameter of the lead wire communicating with the through hole from a side surface of the insulating plate;
An electrolytic capacitor characterized in that the lead wire, which is set to a length halfway up the notch, is bent onto the notch. (2) Utility model registration claim No. (1) characterized in that a terminal plate is adhered or placed on an elastic sealing plug
Electrolytic capacitors listed in section. (3) The electrolytic capacitor according to claim (1) or (2) of the utility model registration, characterized in that the cuts are provided in parallel in a straight line, in the same direction, or in opposite directions.