JPH10270294A - Aluminum electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum electrolytic capacitor which can prevent sound quality deterioration due to magnetic lines of force and vibration from the outside, and realize music reproduction of high tone quality, when the capacitor is mounted on an acoustic electronic apparatus and used. SOLUTION: This capacitor is provided with the following: a capacitor element 11 constituted by winding an anode foil and a cathode foil between which a separator is interposed, in electrolyte for driving with which the capacitor element 11 is impregnated, a closed-end metal case 12 for accommodating the capacitor element 11, and a sealing member 13 for sealing the aperture part of the closed-end metal case 12. A conductive plate type member 15 is wound around the outer surface of the closed-end metal case 12.

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 for audio electronic equipment.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional aluminum electrolytic capacitor of this type is made by roughening a valve metal foil and forming a dielectric film by anodic oxidation and an aluminum foil. The cathode foil is wound with a separator interposed therebetween, and impregnated with a driving electrolyte to form a capacitor element 1.
Is housed in a cylindrical metal case 2 with a bottom, and a sealing body 3 is sealed in the opening of the metal case 2 so that the internal driving electrolyte does not evaporate.

[0003]

In recent years, there has been a growing demand in the market for high quality sound of aluminum electrolytic capacitors in accordance with the trend toward higher sound quality of audio electronic equipment.

However, when the above-mentioned conventional aluminum electrolytic capacitor is mounted on an electronic device for sound and used,
The lines of magnetic force generated from the aluminum electrolytic capacitor itself generate eddy currents on the surface of the metal case 2 although they are minute, and the eddy currents cause signal deterioration in equipment for transmitting music signals, leading to sound quality deterioration. Was. Also,
There is also a problem that vibrations from the outside such as a power transformer are transmitted to the capacitor element 1 via the metal case 2 to cause deterioration of sound quality.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. When mounted on an acoustic electronic device and used, sound quality can be prevented from deteriorating due to lines of magnetic force or external vibration, thereby realizing high-quality music reproduction. It is an object of the present invention to provide an aluminum electrolytic capacitor that can be used.

[0006]

In order to achieve the above object, an aluminum electrolytic capacitor according to the present invention comprises: a capacitor element formed by winding an anode foil and a cathode foil with a separator interposed therebetween; A driving electrolyte to be impregnated in the capacitor element, a bottomed metal case for housing the capacitor element, and a sealing body for closing an opening of the bottomed metal case, an outer surface of the bottomed metal case. With a conductive plate wound, this configuration prevents sound quality degradation due to magnetic lines of force and external vibrations when used in acoustic electronic equipment, realizing high-quality music playback. Is what you can do.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention provides a capacitor element formed by winding an anode foil and a cathode foil with a separator interposed therebetween, and impregnating the capacitor element. A bottomed metal case accommodating the capacitor element, and a sealing body for closing an opening of the bottomed metal case, and a conductive plate-shaped body on an outer surface of the bottomed metal case. According to this configuration, since the conductive plate-shaped member wound on the outer surface of the bottomed metal case generates magnetic lines of force, the magnetic lines of force cancel the magnetic lines of force generated from the aluminum electrolytic capacitor itself. As a result, the lines of magnetic force generated from the aluminum electrolytic capacitor itself generate eddy currents as in the past, and this eddy current causes signal deterioration in equipment for transmitting music signals. As a result, the signal quality can be prevented from deteriorating due to the signal deterioration.Even if there is external vibration such as a power transformer, this vibration is generated by the conductive plate Since the vibration can be reduced, the deterioration of sound quality due to the transmission of vibration from the outside to the capacitor element inside the bottomed metal case can be reduced, and high-quality music reproduction can be realized.

Further, by winding a conductive plate on the outer surface of the bottomed metal case, it is possible to reduce the impedance in a high frequency range in the frequency characteristics of the aluminum electrolytic capacitor.

According to a second aspect of the present invention, the conductive plate is formed in a spiral shape, and the spiral conductive plate is mounted on the outer surface of a bottomed metal case. According to
Since the conductive plate is formed in a spiral shape, even when the conductive plate is mounted on the outer surface of the bottomed metal case, the conductive plate can be easily mounted with a feeling of being screwed. .

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partially cutaway front view of an aluminum electrolytic capacitor according to an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a capacitor element. Further, an anode foil having a dielectric film formed by anodic oxidation,
The cathode foil obtained by roughening the aluminum foil is wound with a separator interposed therebetween. After being impregnated with the driving electrolyte, the capacitor element 11 is housed in a bottomed cylindrical metal case 12 made of aluminum. Reference numeral 13 denotes a sealing body which is sealed in the opening of the bottomed metal case 12 so that the internal driving electrolyte does not evaporate. The sealing body 13 has an anode-side external terminal 14a.
And a cathode-side external terminal 14b are attached, and a lead member connected to the anode foil and the cathode foil is connected to the anode-side external terminal 14a and the cathode-side external terminal 14b.

Reference numeral 15 denotes a conductive plate made of copper, silver, or the like wound around the outer surface of the bottomed metal case 12. The conductive plate 15 is formed in a spiral shape. When the body 15 is mounted on the outer surface of the bottomed metal case 12, the conductive plate-like body 15 is mounted with a feeling of being screwed. Reference numeral 16 denotes a resin tube mounted on the outer surface of the bottomed metal case 12 so as to cover the entirety of the conductive plate 15.

In the above-described embodiment of the present invention, since the conductive plate 15 is wound around the outer surface of the bottomed metal case 12, the conductive plate 15 generates magnetic lines of force. The lines of magnetic force generated by the aluminum electrolytic capacitor itself are canceled by these lines of magnetic force, so that the lines of magnetic force generated by the aluminum electrolytic capacitor itself generate an eddy current as in conventional devices, and this eddy current is used in devices that transmit music signals. Signal degradation does not occur, thereby preventing sound quality degradation due to the signal degradation.

Also, even if there is external vibration such as a power transformer, the vibration can be reduced by the conductive plate 15 wound around the outer surface of the bottomed metal case 12, so that external vibration can be obtained. Is transmitted to the capacitor element 11 housed in the bottomed metal case 12 so that deterioration of sound quality is reduced, and music reproduction with high sound quality can be realized.

Further, since the conductive plate 15 is formed in a spiral shape, even when the conductive plate 15 is mounted on the outer surface of the bottomed metal case 12, the conductive plate 15 is easily screwed. It can be attached to.

Table 1 shows the frequency points of a conventional aluminum electrolytic capacitor (conventional product) and an aluminum electrolytic capacitor according to one embodiment of the present invention (product of the present invention) using a YHP impedance analyzer. 5 shows the results of measuring the impedance at.

[0016]

[Table 1]

As is clear from Table 1, the product of the present invention can lower the impedance in a high frequency range of 10 MHz as compared with the conventional product.

In the embodiment of the present invention, the conductive plate 15 is wound around the outer surface of the bottomed metal case 12, and thereafter, the entire surface of the conductive plate 15 is covered. In the above description, the resin tube 16 is mounted on the outer surface of the bottomed metal case 12. On the contrary, the resin tube 16 is mounted on the outer surface of the bottomed metal case 12, and then the resin tube 16 is mounted. Alternatively, the conductive plate 15 may be wound so as to be positioned on the upper surface 16.

In the embodiment of the present invention, the anode external terminal 14a and the cathode external terminal 14b attached to the sealing body 13 are connected to the lead member connected to the anode foil and the cathode foil. The present invention has been described as applied to an aluminum electrolytic capacitor of the present invention, but the present invention is also applied to an aluminum electrolytic capacitor having a structure in which lead wires connected to an anode foil and a cathode foil are penetrated through a sealing body and drawn out to the outside. You can do it.

[0020]

As described above, the aluminum electrolytic capacitor of the present invention has a capacitor element formed by winding an anode foil and a cathode foil with a separator interposed therebetween,
A driving electrolytic solution impregnated in the capacitor element, a bottomed metal case for housing the capacitor element, and a sealing body for closing an opening of the bottomed metal case, and an outer surface of the bottomed metal case. According to this configuration, the conductive plate-shaped member wound around the outer surface of the bottomed metal case generates magnetic lines of force. The lines of magnetic force generated are canceled out, and as a result, the lines of magnetic force generated from the aluminum electrolytic capacitor itself generate eddy currents as in the past, and this eddy current also causes signal deterioration in equipment that transmits music signals. As a result, sound quality deterioration due to this signal deterioration can be prevented, and even if there is external vibration such as a power transformer, this vibration will not Since it can be reduced by the wound conductive plate, sound quality deterioration due to transmission of external vibration to the capacitor element inside the bottomed metal case is reduced, and high-quality music reproduction is realized. Is what you can do.

Further, by winding a conductive plate on the outer surface of the bottomed metal case, the impedance of the aluminum electrolytic capacitor in a high frequency range can be reduced in a high frequency range.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an aluminum electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a conventional aluminum electrolytic capacitor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 capacitor element 12 metal case with bottom 13 sealing body 15 conductive plate

Claims (2)

[Claims] 1. A capacitor element formed by winding an anode foil and a cathode foil with a separator interposed therebetween, a driving electrolyte impregnated in the capacitor element, and a housing for accommodating the capacitor element. A bottom metal case,
A sealing body for closing the opening of the bottomed metal case, and an aluminum electrolytic capacitor having a conductive plate wound around an outer surface of the bottomed metal case. 2. The aluminum electrolytic capacitor according to claim 1, wherein the conductive plate is formed in a spiral shape, and the spiral conductive plate is mounted on an outer surface of a bottomed metal case.