JPS63261828A - Aluminum electrolytic capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to aluminum electrolytic capacitors used in electronic equipment, and more specifically, to improvements in aluminum electrolytic capacitors used in audio equipment and the like.

Prior Art A conventional aluminum electrolytic capacitor was constructed as shown in FIG. In other words, the surface area is expanded by electrochemically roughening the surface of a metal with a valve action, such as aluminum, and then a dielectric film is formed on this surface by anodization to form an anode body, and the opposite The capacitor element 1 is constructed by overlapping and winding the cathode foils with a separator in between and impregnating this with a driving electrolyte (hereinafter referred to as paste). The lead wire 2 is passed through a sealing rubber 3 and is housed in a bottomed cylindrical metal case 4, and the open end of the metal case 4 is sealed with the sealing rubber 3.

In addition, as shown in FIG. 4, there is also a structure in which the open end of the metal case 4 is sealed using a terminal plate 6 such as a rubber pasted bake plate or a resin molded product.

Problems to be Solved by the Invention When using an audio device incorporating such a conventional aluminum electrolytic capacitor, the center of the winding core of the capacitor element in the aluminum electrolytic capacitor is hollow, as shown in Figure 2. 6, the tightening of the capacitor element becomes loose and the electrode foil vibrates, resulting in the so-called "capacitor squeal" phenomenon. This phenomenon causes the distance between the electrodes of the aluminum electrolytic capacitor to become undefined, causing various types of distortion, making it unsuitable for audio equipment that aims to reproduce faithful sound.

The present invention is intended to solve the problem of the squeaking phenomenon of conventional aluminum electrolytic capacitors.

Means to solve the problem The technical means is to wind anode foil and cathode foil with a separator interposed between them, place a core material made of foamed rubber in the center cavity, and impregnate the drive electrolyte. A capacitor element is constructed by storing the capacitor element in a bottomed cylindrical case and sealing the open end with a sealing member.

Effects According to the present invention, the aluminum electrolytic capacitor is constructed so that there is no cavity at the center of the core, and since the core material is foamed rubber, there is no temperature rise during the aging process or during actual use. Because the foam expands, there is no looseness in the winding. This eliminates the phenomenon of "capacitor squeal" caused by the aluminum foil resonating due to vibrations during actual use.

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

FIG. 1 shows a capacitor element according to the present invention.

In the figure, 1 is a capacitor element, and A is a winding core material made of foamed rubber according to the present invention. High-purity aluminum foil is roughened by etching to increase the surface area, and a dielectric film is formed by anodizing to form an anode foil and a cathode foil. The anode foil and cathode foil are wound with foamed rubber in the cavity 6 at the center of the winding core. The winding core material 7 was arranged.

After that, impregnate the paste in exactly the same way as before,
The finished product was then stored in a case and the open end sealed. According to such a product of the present invention, since there is no cavity, there is no resonance due to vibrations during actual use, so the "capacitor squeal" phenomenon does not appear at all, and audio equipment can produce sound that is faithful to the original sound. can be reproduced.

As described in detail, according to the present invention, there is no loosening of the winding of the capacitor element, thereby suppressing the resonance vibration of the aluminum electrolytic capacitor and providing an aluminum electrolytic capacitor with stable characteristics in a high frequency range. Therefore, its industrial value is extremely high for audio equipment that aims to reproduce faithful sound.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a capacitor element in an aluminum electrolytic capacitor according to the present invention, FIG. 2 is a partial cross-sectional view of a capacitor element in a conventional aluminum electrolytic capacitor, and FIG.
4 and 4 are cross-sectional views of conventional aluminum electrolytic capacitors. 1... Capacitor element, 6... Cavity, 7... Winding core material. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2

Claims (1)

[Claims] Anode foil and cathode foil are wound with a separator interposed between them, a core material made of foamed rubber is arranged in the center cavity, and the capacitor element is impregnated with driving electrolyte, and a cylindrical case with a bottom is formed. An aluminum electrolytic capacitor whose open end is sealed with a sealing material.