JPH034021Y2 - - 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. 6, 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 disposed on the sealing plug of the electrolytic capacitor main body constructed in this manner, 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 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 43 and it is brought into contact with the board, or cream solder is printed on the printed circuit board, and the lead wire of the electrolytic capacitor is placed on the cream solder. Reflow soldering is performed in which cream solder is melted by touching the bent tip of 41 and heating the board. During this melting, the air in the recess 43 is heated and expanded, and the expanded air causes the capacitor to float, and the chip-type aluminum electrolytic capacitor mounted and positioned on the printed circuit board moves due to this float, resulting in disconnection. There were cases where the connection was incomplete or the connection was defective.

[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 the elastic sealing plug. an insulating plate disposed above and having a through hole passing through the lead wire, the insulating plate having a width narrower than the diameter of the lead wire communicating with the through hole from the side thereof, and the narrow width notch. The lead wire is characterized in that it has a notch wider than the diameter of the lead wire connected to the lead wire, and the lead wire is bent onto the wide notch.

[Example of the invention] As shown in Fig. 1, an anode foil is formed by roughening aluminum to form a dielectric oxide film and then connecting an extraction terminal 2 having a lead wire 1, and a lead wire 3 by roughening the aluminum foil. A capacitor element 5 is constructed by winding a cathode foil with a lead terminal 4 connected thereto through capacitor paper. The capacitor element 5 is impregnated with a driving electrolyte, and the lead terminals 2,
4 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 near the open end is pressed. A seaming 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 is shown in plan view in FIG.
As shown in a front view in FIG. 3, a narrow cut 13 reaching the through hole 11 from the side surface and a wide cut 14 connected to the narrow cut 13 are formed. The narrow cut 13 has a dimension narrower than the outer diameter of the lead wires 1 and 3, and the wide cut 14 has a dimension wider than the outer diameter of the lead wires 1 and 3. The lead wires 1 and 3 protruding from the insulating plate 12 are bent and cut onto the narrow cut 13, but since the wide cut 14 is wider than the lead wires 1 and 3, the lead wires 1 and 3 will fit within the wide notch 14. If the depth of the wide notch 14 is approximately the same as the outer diameter of the lead wires 1 and 3, the capacitor will have excellent stability when placed on a board for connection to the board.

In the electrolytic capacitor configured as described above, even if the lead wires 1 and 3 are bent onto the narrow notch 13, the notch 13 is narrower than the lead wires 1 and 3.
When the electrolytic capacitor is fixed to the board with cream solder, the insulating plate 1 that is generated during heating to melt the cream solder.
Since the expanded air between the electrolytic capacitor 2 and the electrode of the substrate is mainly released through the narrow notch 13, it is possible to prevent the electrolytic capacitor from lifting or moving due to the expanded air, which was a drawback of the conventional method. Therefore, it is possible to prevent incomplete or poor connection between the electrodes of the substrate and the electrolytic capacitor. In addition, the wide cut 14
By arranging them in series, the stability when fixing to the board is improved, which also has the effect of contributing to the reduction of connection failures. Furthermore, the lead wires 1 and 3 are placed on the narrow cut 13.
In order to bend the lead wire 1, apply cream solder to the lead wire 1,
3, that is, to the side of the narrow cut 13, the contact area becomes large, which also has the effect of improving the connection strength. As shown in FIG. 4, the cuts 23 and 24 of the insulating plate 22 may be provided in the same direction, or as shown in FIG. 5, the cuts 33 and 34 of the insulating plate 32 may be provided in opposite directions.
If a notch is provided, for example, in a direction perpendicular to these, the expanded air at the base of the lead wire or between the lead wires can be easily discharged. 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 terminals 2, 4.

[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. It has the effect that a stable mounting state can be easily obtained when fixing to the substrate.

[Brief explanation of drawings]

Fig. 1 is a front cross-sectional view showing an embodiment of the electrolytic capacitor of the present invention, Fig. 2 is a plan view showing an embodiment of the insulating plate of the invention, and Fig. 3 is a front view of the insulating plate. 4 and 5 are plan views showing other embodiments of the insulating plate according to the present invention, and FIG. 6 is a perspective view showing a conventional 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...Narrow width notch, 14...
...Wide cut.

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 therein and passing through the lead wire, the insulating plate having a cut width narrower than the diameter of the lead wire that communicates with the through hole from a side surface of the insulating plate, and communicating with the narrow cut width. 1. An electrolytic capacitor characterized in that the lead wire has a notch wider than the diameter of the lead wire provided, and the lead wire is bent onto the wide 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. (4) The electrolytic capacitor according to any one of claims (1) to (3) for utility model registration, wherein the wide cut has a depth substantially equal to the diameter of the lead wire. (5) Any one of claims (1) to (4) for registering a utility model, characterized in that the tip of the lead wire bent over a wide cut in an insulating plate is plate-shaped. Electrolytic capacitors listed.