JPH05205985A - Aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide an aluminum electrolytic capacitor, which can realize reproduction of music in high tone quality without causing any deterioration of sound. CONSTITUTION:A metal cylindrical metal case 12 provided with a base where a capacitor element 11 is housed and a sealing member 13 which seals up the opening of the metal case 12 are provided, where the metal case 12 is of double casing structure composed of an outer aluminum case 12a and an outer aluminum case 12b, and three-dimensional whisker 15 of tetrapod-shaped zinc oxide is filled into a gap between the cases 12a and 12b. By this setup, external vibrations and micro-vibrations generated in an aluminum electrolytic capacitor itself are prevented from propagating by the three-dimensional whisker 15 of tetrapod-shaped zinc oxide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum electrolytic capacitor used in audio electronic equipment and the like.

[0002]

2. Description of the Related Art A conventional aluminum electrolytic capacitor of this type, as shown in FIG.
A capacitor foil having a dielectric oxide film formed by anodic oxidation is used as an anode foil, and the anode foil and a cathode foil opposite thereto are wound around a separator to form a capacitor element 1, and the capacitor element 1 is impregnated with a driving electrolytic solution, and the capacitor element 1 is housed in a bottomed cylindrical metal case 2 made of an aluminum material.
After that, the sealing body 3 is attached to the opening of the metal case 2 so that the driving electrolyte solution inside does not evaporate. Reference numeral 4 is a lead wire derived from the capacitor element 1.

[0003]

However, since the metal case 2 in the above-mentioned conventional aluminum electrolytic capacitor is single, when this aluminum electrolytic capacitor is mounted and used in an audio equipment, it is generated from the outside such as a transformer. The metal case 2 resonates due to the vibrations generated and the slight vibrations generated from the aluminum electrolytic capacitor itself, and as a result, high-order harmonic distortion components are generated in the transmission of music signals and the power supply to the filter section of the power supply section. There is a problem in that the sound quality is deteriorated due to the addition.

The present invention solves such problems, and an object of the present invention is to provide an aluminum electrolytic capacitor capable of reproducing music of high sound quality without causing deterioration of sound quality.

[0005]

In order to achieve the above object, the aluminum electrolytic capacitor of the present invention is a capacitor element formed by winding an anode foil and a cathode foil with a separator interposed between them and impregnating a driving electrolyte solution. And a bottomed cylindrical metal case that houses this capacitor element, and a sealing member that seals the opening of this metal case. As the metal case, an outer metal case made of an aluminum material and an aluminum material The metal case has a double structure in which a tetrapod-shaped three-dimensional zinc oxide whisker is interposed between the metal case and the inner metal case.

[0006]

According to the aluminum electrolytic capacitor having the above structure, a tetrapod-shaped zinc oxide is formed between the outer metal case made of an aluminum material and the inner metal case made of an aluminum material as a metal case for housing the capacitor element. Since a double-structured metal case with a three-dimensional whisker intervening is used, when this aluminum electrolytic capacitor is mounted and used in audio electronic equipment, etc., external vibration generated from a transformer, etc. and aluminum electrolytic capacitor Even if there is a microvibration generated from itself, the propagation of these vibrations and microvibrations can be reduced by the presence of the tetrapod-shaped zinc oxide three-dimensional whiskers interposed in the double-structured metal case, As a result, the generation of high-order harmonic distortion components can also be reduced, so that it is possible to suppress the transmission of minute music signals. Without causing deterioration and sound quality degradation,
High-quality music reproduction can be realized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 11 denotes a capacitor element. The capacitor element 11 is formed by roughening an aluminum foil which is a valve metal and then forming a dielectric oxide film by anodic oxidation on the anode foil. The anode foil and a cathode foil opposite to the anode foil are wound around a separator. And this capacitor element 1
1 is impregnated with a driving electrolytic solution, and then the capacitor element 11 is mounted in a bottomed cylindrical metal case 12 having a double structure, and a sealing member 13 is mounted on one end opening of the metal case 12. Then, the one end opening side of the metal case 12 is drawn to perform the sealing. Reference numeral 14 is a lead wire derived from the capacitor element 11.

The metal case 12 is, as shown in FIG. 2, an outer metal case 12 made of an aluminum material.
a and an inner metal case 12b made of an aluminum material
It has a double structure consisting of
A two-dimensional tetrapod-shaped zinc oxide whisker 15 is interposed between 2b.

According to the aluminum electrolytic capacitor having the above-mentioned structure, as the metal case 12, the tetrapod-shaped tertiary zinc oxide is formed between the outer metal case 12a made of an aluminum material and the inner metal case 12b made of an aluminum material. Since the double-structured metal case 12 in which the original whiskers 15 are interposed is used, the three-dimensional tetrapod-shaped zinc oxide is interposed between the outer metal case 12a and the inner metal case 12b in this double structure. Whisker 1
5, the aluminum electrolytic capacitor of the present invention has a vibration damping capacity as shown in FIG. 3A as compared with the conventional aluminum electrolytic capacitor shown in FIG. This makes it possible to reduce the vibration propagation even if there is a slight vibration generated from a transformer or the like when this aluminum electrolytic capacitor is mounted on an electronic device for acoustics and used. Since the resonance vibration of the metal case 12 itself can be reduced, and as a result, the high-order harmonic distortion component generated from the aluminum electrolytic capacitor itself due to the vibration can also be reduced, the signal deterioration in the propagation of a minute music signal can be reduced. It is possible to realize high-quality music reproduction without causing deterioration of sound quality.

[0011]

As described above, the aluminum electrolytic capacitor of the present invention serves as a metal case for accommodating a capacitor element.
Since a double-structured metal case in which a tetrapod-shaped three-dimensional whisker of zinc oxide is interposed between an outer metal case made of aluminum material and an inner metal case made of aluminum material, this aluminum electrolytic capacitor is used. When mounted on an electronic device for acoustics, etc., even if there is external vibration generated from a transformer, etc. or slight vibration generated from the aluminum electrolytic capacitor itself, these It can be reduced by the presence of the three-dimensional whiskers of tetrapod-shaped zinc oxide interposed between the metal cases of the heavy structure, which can reduce the resonance vibration of the metal case itself.
It is possible to realize high-quality music reproduction without causing signal deterioration or sound quality deterioration in the propagation of a minute music signal.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an aluminum electrolytic capacitor showing an embodiment of the present invention.

FIG. 2 is a sectional front view of a main part of a double-structured metal case in the capacitor.

FIG. 3A is a vibration damping characteristic diagram of the aluminum electrolytic capacitor of the present invention. FIG. 3B is a vibration damping characteristic diagram of the conventional aluminum electrolytic capacitor.

FIG. 4 is a vertical sectional view of an aluminum electrolytic capacitor showing a conventional example.

[Explanation of symbols]

 Reference Signs List 11 capacitor element 12 metal case 12a outer metal case 12b inner metal case 13 sealing member 15 tetrapod-shaped three-dimensional whisker of zinc oxide

Claims (1)

[Claims] 1. A capacitor element formed by winding an anode foil and a cathode foil through a separator and impregnating a driving electrolyte solution, a cylindrical metal case having a bottom for housing the capacitor element, and the metal. A three-dimensional whisker of zinc oxide in a tetrapot shape between the outer metal case made of an aluminum material and the inner metal case made of an aluminum material, which is provided with a sealing member for sealing the opening of the case. An aluminum electrolytic capacitor, which is characterized by using a double-structured metal case with a capacitor interposed therebetween.