JPS629707Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to electrolytic capacitors, and particularly to the structure of flat, thin dry type aluminum electrolytic capacitors.

[Conventional technology]

Various electronic devices are made smaller and smaller by converting the component circuits into ICs.
Electrolytic capacitors, which are one of their constituent parts, are becoming lighter and lighter, and in addition to being smaller, they are also shaped into flat, thin shapes that improve mounting efficiency inside electronic devices. is required.

[Problem that the invention aims to solve] By the way, unlike other electronic components, the various electrical characteristics of electrolytic capacitors, such as capacitance, are determined by the facing area of the electrodes, the state of retention of the electrolyte in which it is impregnated, etc. Therefore, the area of the electrode has to be extremely narrowed,
Meeting such demands by simplifying the exterior may make the electrical characteristics unstable and reduce reliability.

Therefore, the present invention is to provide an electrolytic capacitor that is flat and thin and has stable electrical characteristics.

[Means for solving problems]

As shown in Fig. 1, the electrolytic capacitor of this invention consists of plate-shaped electrodes (electrodes 4, 6) that have a chemical oxide film formed on at least the anode side and that face each other, and each plate-shaped electrode (electrodes 4, 6). Separator paper 8 inserted into the space (airtight chamber 16) formed between the plate electrodes (electrodes 4, 6) by the sealing ring 10 installed between the sealing ring 10 and the sealing ring 10. , an electrolytic solution filled in a space (airtight chamber 16), and a synthetic resin layer 18 covering the outer surface of the plate-shaped electrodes (electrodes 4, 6) and the sealing ring 10.

[Effect]

With this structure, by covering with the synthetic resin layer 18, the space formed by the plate-shaped electrodes 4, 6 on the anode and cathode sides and the sealing ring 10 becomes airtight, and the inside thereof becomes airtight. Since the electrolyte and the separator paper 8 are installed, the electrolyte is confined in the airtight space, preventing seepage and evaporation, and is not affected by impurities from the outside, stabilizing the electrical characteristics. can be achieved.

〔Example〕

Hereinafter, embodiments of this invention will be described with reference to the drawings.

1 and 2 show an embodiment of the electrolytic capacitor of this invention, with FIG. 1 showing an exploded state of an electrolytic capacitor element, and FIG. 2 showing a cross section of the electrolytic capacitor.

As shown in FIGS. 1 and 2, the electrolytic capacitor element 2 includes plate-shaped electrodes 4 on the anode side and the cathode side,
6. Consists of a separator paper 8 and a sealing ring 10 as a sealing member, and although not shown, separator paper 8 and an electrolyte are accommodated between each electrode 4 and 6, and the separator paper 8 is impregnated with the electrolyte. has been done. In this embodiment, aluminum plates are used for each of the electrodes 4 and 6, and at least their opposing surfaces are roughened by etching, and a chemical oxide film 12 is formed on the electrode 4 on the anode side. ing.

A lead wire 14 made of a solderable metal wire is welded to the outer surface of each electrode 4, 6.

The sealing ring 10 is made of rubber, hot melt material, or other synthetic resin, and its outer diameter is matched to the outer diameter of the electrodes 4 and 6, and its inner diameter is made of rubber, hot melt material, or other synthetic resin. The size is set to be necessary to ensure the volume of the airtight chamber 16 as a space formed by the ring 10. Airtight room 16
The separator paper 8 and the electrolyte are housed in the container.

A synthetic resin layer 18 is formed on the outer surface of the electrolytic capacitor element 2, as shown in FIG. 2, and the airtight chamber 16 is placed in a sealed state.

With the above configuration, a flat and thin electrolytic capacitor can be easily formed, and in particular, the portion functioning as the electrolytic capacitor element 2 is formed by the electrodes 4 and 6 and the sealing ring 10. Furthermore, since sufficient airtightness is obtained by the sealing ring 10 and the synthetic resin layer 18, inconveniences such as seepage and evaporation of the electrolyte are prevented. , good electrical characteristics can be maintained over a long period of time. Moreover, the airtight chamber 16 can be obtained extremely easily, and impregnation with the electrolytic solution and insertion of the separator paper 8 between the electrodes 4 and 6 can be easily performed.

Electrolytic capacitors configured in this manner are suitable for relatively small and small capacity capacitors, and are useful for improving the packaging density of electronic components inside various electronic devices.

Furthermore, if a hot melt material is used for the sealing ring 10, the electrodes 4 and 6 can be joined simply by heat and pressure bonding, and a high degree of airtightness can be maintained, so that manufacturing efficiency can be improved.

Further, the electrodes 4 and 6 of the above embodiment may be constructed by attaching electrode foils 24 and 26 on the anode side and the cathode side to the opposing surfaces of the electrode plates 20 and 22, as shown in FIG. Effects can be obtained. Note that the electrode foil 24 on the anode side is subjected to the same treatment as the electrode 4.
Further, by forming a similar chemical conversion oxide film on the attached electrode foils 24 and 26, a nonpolar electrolytic capacitor can be easily obtained.

Moreover, the electrodes 4 and 6 are rectangular instead of disc-shaped.
It is possible to form the sealing ring 10 into any shape and thickness, such as a square, and set its size freely to obtain the desired capacitance. In this case, the shape of the sealing ring 10 is the same as the shape of the electrodes 4 and 6. and shall be formed according to the size. In particular, when the electrodes 4 and 6 are made of thin foil-like electrodes such as aluminum foil, an extremely thin electrolytic capacitor can be formed.

Further, the lead wire 14 is, as in the embodiment,
It may be formed not only in a rod shape but also in a flat plate shape, and the same effect can be obtained by forming a terminal portion for face bonding (direct attachment) on the surface of the synthetic resin layer 18 instead of the lead wire 14. be.

[Effect of idea]

As explained above, according to this invention, it is possible to provide at low cost an electrolytic capacitor that is flat and thin, prevents deterioration of the electrolytic solution, stabilizes electrical characteristics, and improves reliability.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of an electrolytic capacitor element that is an embodiment of the electrolytic capacitor of this invention, Figure 2 is a sectional view of the electrolytic capacitor of this invention, and Figure 3 is another embodiment of the electrolytic capacitor of this invention. FIG. 2... Electrolytic capacitor element, 4, 6... Plate electrodes on the anode side and cathode side, 8... Separator paper, 1
0... Sealing ring, 16... Airtight chamber as a space, 18... Synthetic resin layer.

Claims (1)

[Claims for Utility Model Registration] (1) Plate-shaped electrodes having a chemical oxide film formed on at least the anode side and facing each other, a sealing ring installed between each plate-shaped electrode, and installation of the sealing ring. a separator paper inserted into a space formed between the plate-shaped electrodes, an electrolytic solution filled in the space, and a synthetic resin layer covering the outer surfaces of the plate-shaped electrodes and the sealing ring. An electrolytic capacitor characterized by comprising: (2) The electrolytic capacitor according to claim 1, wherein the plate-shaped electrode has electrode foil attached to opposing surfaces thereof.