JPH0266930A - Electrolytic capacitor - Google Patents

Abstract

PURPOSE:To inexpensively provide an aluminum electrolytic capacitor having excellent mechanical strength and excellent cleaning resistance by sealing the opening of the case with a sealer formed by encasing a capacitor element and applying rubberlike elastic material to a nonrubberlike elastic material in which 30-70% of flat surface area is deleted. CONSTITUTION:A sealing material 8 is formed by laminating a rubberlike elastic material 10 on a nonrubberlike elastic material 9, and the material 10 is so formed with a deleted part 10a that 30-70% of the flat surface area is deleted. A capacitor element 1 is wound together with an anode foil and a cathode foil through a separator, impregnated with driving electrolyte, and leads 2 are mounted by passing through the lead holes 11 of the material 8. This is contained in a metal case 4, and its open end is reduced to complete sealing. The material 10 is reduced in thickness to reduce in size and thickness of an electrolytic capacitor. Since small pores are formed on the flat face of the sealing material, cleanser can be rapidly dispersed to eliminate the disconnection of the leads by corrosion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrolytic capacitor, and more particularly to a sealing member for an electrolytic capacitor.

2. Description of the Related Art A conventional electrolytic capacitor was constructed as shown in FIG. In other words, the surface area is expanded by electrochemically roughening a metal with valve action, such as aluminum, and a dielectric film is formed on this surface by anodic oxidation to form an anode body, which is opposed to a cathode body. The foils are overlapped and wound through a separate rake, and the driving electrolyte (
Hereinafter, the capacitor element 1 is impregnated with a paste (hereinafter referred to as paste), and the capacitor element 1 is
The structure is such that a lead wire 2 drawn out from the metal case 4 is housed in a cylindrical metal case 4 with a bottom while passing through a sealing rubber 3, and the open end of the metal case 4 is sealed with the sealing rubber 3.

PROBLEMS TO BE SOLVED BY THE INVENTION Conventional aluminum electrolytic capacitors have been required to be smaller and lower in profile to meet the demand for smaller and thinner electronic devices. Downsizing aluminum electrolytic capacitors
In order to reduce the height, the sealing rubber can be made thinner. However, when the sealing rubber is made thinner, its mechanical strength becomes weaker, and external forces applied to the external lead wires are transmitted internally, resulting in leakage current defects or leakage from the inside of the aluminum electrolytic capacitor to the base.

To solve this problem, a two-layer sealing material has been proposed in which a rubber-like elastic body 7 is bonded to a non-rubber elastic body 6, as shown in FIGS. 3a and 3b. When such a two-layer sealing material is used, sufficient mechanical strength is maintained. However, when such an aluminum electrolytic capacitor is mounted on a printed circuit board and then cleaned with an organic cleaning agent, the organic cleaning agent does not evaporate and remains for a long time, causing a problem that lead wires corrode.

The present invention is intended to solve these problems, and provides an inexpensive aluminum electrolytic capacitor that has excellent mechanical strength and wash resistance.

Means for Solving the Problems To achieve this, the present invention involves winding an anode foil and a cathode foil together with a separator, impregnating them with an electrolytic solution to form a capacitor element, housing the capacitor element in a case, and removing the capacitor from the case. The opening is sealed using a sealing body made by bonding a rubber-like elastic body to a non-rubber-like elastic body from which 30 to 70% of the planar surface area has been removed.

Effects According to the structure of the present invention, since the sealing member is made by laminating a non-rubber-like elastic body and a rubber-like elastic body, sufficient mechanical strength is maintained, so that the thickness of the rubber-like elastic body can be reduced. Can be made thinner. Moreover, since the non-rubber-like elastic body is provided with holes, after soldering, the lead wires are not corroded because the cleaning agent evaporates through a simple drying process after cleaning with an organic cleaning agent.

Example Hereinafter, one embodiment of the present invention will be described using the drawings.

In Figure 1 B, 1 is a capacitor element, 2 is a lead wire,
4 is a metal case, and 8 is a sealing material according to the present invention. FIG. 1 shows a sealing material 8 according to the present invention.

This sealing material 8 is made by laminating a rubber-like elastic body 10 to a non-rubber-like elastic body 9, and the rubber-like elastic body 1° has a removed portion so that 30 to 70% of the planar surface area is removed. 10a is provided.

The capacitor element 1 is constructed by winding an anode foil and a cathode foil together with a separator and impregnating them with a driving electrolyte. The lead wire 2 drawn out from this capacitor element 1 was passed through the lead hole 11 of the sealing material 8 according to the present invention shown in FIG. 1 and attached thereto. This was housed in a metal case 4, and the open end was drawn to complete the sealing. The drawing process was performed so that the metal case 4 was drawn at the rubber portion of the sealing material 8.

Effects of the Invention The electrolytic capacitor of the present invention has the following effects.

- Since the rubber-like elastic body in the sealing material can be made thinner, electrolytic capacitors can be made smaller and thinner.

■ Small holes are provided in the flat surface of the sealing material, so the cleaning agent quickly evaporates, so there is no corrosion or disconnection of the lead wires.

[Brief explanation of the drawing]

FIG. 1a is a sectional view of an aluminum electrolytic capacitor according to an embodiment of the present invention, FIG. 1 is a perspective view of a sealing material according to the present invention,
Figure 2 is a sectional view of a conventional general aluminum electrolytic capacitor, Figure 3a is a sectional view of an aluminum electrolytic capacitor using a conventional two-layer sealant, and Figure 3 is a perspective view of a conventional two-layer sealant. It is a diagram. DESCRIPTION OF SYMBOLS 1... Capacitor element, 4... Metal case, 8... Sealing material, 9... Non-rubber-like elastic body, 1o... Rubber-like elastic body, 10 &...
...Deletion section. Name of agent: Patent attorney Shigetaka Awano and 1 other person
・-Bonten V Ritsuko 4-Bon 1 Booth 8-Ear opening material q・-・Gum-like Yohokyu

Claims (1)

[Claims] An anode foil and a cathode foil are wound together with a separator and impregnated with electrolyte to form a capacitor element, and the capacitor element is housed in a case, and the opening of the case is made of a non-woven fabric with 30 to 70% of the planar surface area removed. An electrolytic capacitor sealed using a sealing body made by bonding a rubber-like elastic body to a rubber-like elastic body.